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uml: throw out CONFIG_MODE_TT

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This patchset throws out tt mode, which has been non-functional for a while.

This is done in phases, interspersed with code cleanups on the affected files.

The removal is done as follows:
	remove all code, config options, and files which depend on
CONFIG_MODE_TT
	get rid of the CHOOSE_MODE macro, which decided whether to
call tt-mode or skas-mode code, and replace invocations with their
skas portions
	replace all now-trivial procedures with their skas equivalents

There are now a bunch of now-redundant pieces of data structures, including
mode-specific pieces of the thread structure, pt_regs, and mm_context.  These
are all replaced with their skas-specific contents.

As part of the ongoing style compliance project, I made a style pass over all
files that were changed.  There are three such patches, one for each phase,
covering the files affected by that phase but no later ones.

I noticed that we weren't freeing the LDT state associated with a process when
it exited, so that's fixed in one of the later patches.

The last patch is a tidying patch which I've had for a while, but which caused
inexplicable crashes under tt mode.  Since that is no longer a problem, this
can now go in.

This patch:

Start getting rid of tt mode support.

This patch throws out CONFIG_MODE_TT and all config options, code, and files
which depend on it.

CONFIG_MODE_SKAS is gone and everything that depends on it is included
unconditionally.

The few changed lines are in re-written Kconfig help, lines which needed
something skas-related removed from them, and a few more which weren't
strictly deletions.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-10-16 01:26:50 -07:00 committed by Linus Torvalds
parent a1ff5878d2
commit 42fda66387
87 changed files with 34 additions and 4203 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
arch/um/Kconfig
View File

@ -62,55 +62,16 @@ config IRQ_RELEASE_METHOD
menu "UML-specific options"
config MODE_TT
bool "Tracing thread support (DEPRECATED)"
default n
depends on BROKEN
help
This option controls whether tracing thread support is compiled
into UML. This option is largely obsolete, given that skas0 provides
skas security and performance without needing to patch the host.
It is safe to say 'N' here; saying 'Y' may cause additional problems
with the resulting binary even if you run UML in SKAS mode, and running
in TT mode is strongly *NOT RECOMMENDED*.
config STATIC_LINK
bool "Force a static link"
default n
depends on !MODE_TT
help
If CONFIG_MODE_TT is disabled, then this option gives you the ability
to force a static link of UML. Normally, if only skas mode is built
in to UML, it will be linked as a shared binary. This is inconvenient
for use in a chroot jail. So, if you intend to run UML inside a
chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
here.
This option gives you the ability to force a static link of UML.
Normally, UML is linked as a shared binary. This is inconvenient for
use in a chroot jail. So, if you intend to run UML inside a chroot,
you probably want to say Y here.
Additionally, this option enables using higher memory spaces (up to
2.75G) for UML - disabling CONFIG_MODE_TT and enabling this option leads
to best results for this.
config KERNEL_HALF_GIGS
int "Kernel address space size (in .5G units)"
default "1"
depends on MODE_TT
help
This determines the amount of address space that UML will allocate for
its own, measured in half Gigabyte units. The default is 1.
Change this only if you need to boot UML with an unusually large amount
of physical memory.
config MODE_SKAS
bool "Separate Kernel Address Space support" if MODE_TT
default y
help
This option controls whether skas (separate kernel address space)
support is compiled in.
Unless you have specific needs to use TT mode (which applies almost only
to developers), you should say Y here.
SKAS mode will make use of the SKAS3 patch if it is applied on the host
(and your UML will run in SKAS3 mode), but if no SKAS patch is applied
on the host it will run in SKAS0 mode, which is anyway faster than TT
mode.
2.75G) for UML.
source "arch/um/Kconfig.arch"
source "mm/Kconfig"
@ -118,7 +79,7 @@ source "mm/Kconfig"
config LD_SCRIPT_STATIC
bool
default y
depends on MODE_TT || STATIC_LINK
depends on STATIC_LINK
config LD_SCRIPT_DYN
bool
@ -220,7 +181,7 @@ config SMP
bool "Symmetric multi-processing support (EXPERIMENTAL)"
default n
#SMP_BROKEN is for x86_64.
depends on MODE_TT && EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN))
depends on EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN))
help
This option enables UML SMP support.
It is NOT related to having a real SMP box. Not directly, at least.
@ -258,11 +219,6 @@ config NEST_LEVEL
inside another UML, set CONFIG_NEST_LEVEL to one more than the host
UML.
Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
Only change this if you are running nested UMLs.
config HIGHMEM
bool "Highmem support (EXPERIMENTAL)"
depends on !64BIT && EXPERIMENTAL
@ -271,9 +227,9 @@ config HIGHMEM
This was used to allow UML to run with big amounts of memory.
Currently it is unstable, so if unsure say N.
To use big amounts of memory, it is recommended to disable TT mode (i.e.
CONFIG_MODE_TT) and enable static linking (i.e. CONFIG_STATIC_LINK) -
this should allow the guest to use up to 2.75G of memory.
To use big amounts of memory, it is recommended enable static
linking (i.e. CONFIG_STATIC_LINK) - this should allow the
guest to use up to 2.75G of memory.
config KERNEL_STACK_ORDER
int "Kernel stack size order"

2
arch/um/Kconfig.char
View File

@ -65,8 +65,6 @@ config XTERM_CHAN
This option enables support for attaching UML consoles and serial
lines to xterms. Each UML device so assigned will be brought up in
its own xterm.
If you disable this option, then CONFIG_PT_PROXY will be disabled as
well, since UML's gdb currently requires an xterm.
It is safe to say 'Y' here.
config NOCONFIG_CHAN

23
arch/um/Kconfig.debug
View File

@ -2,28 +2,9 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
config CMDLINE_ON_HOST
bool "Show command line arguments on the host in TT mode"
depends on MODE_TT
default !DEBUG_INFO
help
This controls whether arguments in guest processes should be shown on
the host's ps output.
Enabling this option hinders debugging on some recent GDB versions
(because GDB gets "confused" when we do an execvp()). So probably you
should disable it.
config PT_PROXY
bool "Enable ptrace proxy"
depends on XTERM_CHAN && DEBUG_INFO && MODE_TT
help
This option enables a debugging interface which allows gdb to debug
the kernel without needing to actually attach to kernel threads.
If you want to do kernel debugging, say Y here; otherwise say N.
config GPROF
bool "Enable gprof support"
depends on DEBUG_INFO && MODE_SKAS && !MODE_TT
depends on DEBUG_INFO
help
This allows profiling of a User-Mode Linux kernel with the gprof
utility.
@ -36,7 +17,7 @@ config GPROF
config GCOV
bool "Enable gcov support"
depends on DEBUG_INFO && MODE_SKAS
depends on DEBUG_INFO
help
This option allows developers to retrieve coverage data from a UML
session.

24
arch/um/Makefile
View File

@ -31,18 +31,9 @@ SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
um-modes-$(CONFIG_MODE_TT) += tt
um-modes-$(CONFIG_MODE_SKAS) += skas
MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/skas
MODE_INCLUDE += $(foreach mode,$(um-modes-y),\
-I$(srctree)/$(ARCH_DIR)/include/$(mode))
MAKEFILES-INCL += $(foreach mode,$(um-modes-y),\
$(srctree)/$(ARCH_DIR)/Makefile-$(mode))
ifneq ($(MAKEFILES-INCL),)
include $(MAKEFILES-INCL)
endif
include $(srctree)/$(ARCH_DIR)/Makefile-skas
ARCH_INCLUDE := -I$(ARCH_DIR)/include
ifneq ($(KBUILD_SRC),)
@ -89,9 +80,8 @@ CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
# included; the values here are meaningless
CONFIG_NEST_LEVEL ?= 0
CONFIG_KERNEL_HALF_GIGS ?= 0
SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
SIZE = ($(CONFIG_NEST_LEVEL) * 0x20000000)
PHONY += linux
@ -124,7 +114,6 @@ CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,)
$(call cc-option, -fno-stack-protector,) \
$(call cc-option, -fno-stack-protector-all,)
CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
CONFIG_KERNEL_STACK_ORDER ?= 2
STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
@ -132,11 +121,8 @@ ifndef START
START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
endif
CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
-DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
-DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
-DKERNEL_STACK_SIZE=$(STACK_SIZE) \
-DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap.o
CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
-DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
#The wrappers will select whether using "malloc" or the kernel allocator.
LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc

6
arch/um/Makefile-i386
View File

@ -2,11 +2,7 @@ core-y += arch/um/sys-i386/ arch/x86/crypto/
TOP_ADDR := $(CONFIG_TOP_ADDR)
ifeq ($(CONFIG_MODE_SKAS),y)
ifneq ($(CONFIG_MODE_TT),y)
START := 0x8048000
endif
endif
START := 0x8048000
LDFLAGS += -m elf_i386
ELF_ARCH := $(SUBARCH)

2
arch/um/defconfig
View File

@ -12,9 +12,7 @@ CONFIG_IRQ_RELEASE_METHOD=y
#
# UML-specific options
#
# CONFIG_MODE_TT is not set
# CONFIG_STATIC_LINK is not set
CONFIG_MODE_SKAS=y
#
# Host processor type and features

15
arch/um/drivers/mconsole_kern.c
View File

@ -735,8 +735,6 @@ void mconsole_sysrq(struct mc_request *req)
}
#endif
#ifdef CONFIG_MODE_SKAS
static void stack_proc(void *arg)
{
struct task_struct *from = current, *to = arg;
@ -750,7 +748,7 @@ static void stack_proc(void *arg)
* Dumps a stacks registers to the linux console.
* Usage stack <pid>.
*/
static void do_stack_trace(struct mc_request *req)
void mconsole_stack(struct mc_request *req)
{
char *ptr = req->request.data;
int pid_requested= -1;
@ -781,17 +779,6 @@ static void do_stack_trace(struct mc_request *req)
}
with_console(req, stack_proc, to);
}
#endif /* CONFIG_MODE_SKAS */
void mconsole_stack(struct mc_request *req)
{
/* This command doesn't work in TT mode, so let's check and then
* get out of here
*/
CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode",
1, 0),
do_stack_trace(req));
}
/* Changed by mconsole_setup, which is __setup, and called before SMP is
* active.

1
arch/um/include/as-layout.h
View File

@ -28,7 +28,6 @@ extern unsigned long _unprotected_end;
extern unsigned long brk_start;
extern int linux_main(int argc, char **argv);
extern void set_cmdline(char *cmd);
extern void (*sig_info[])(int, union uml_pt_regs *);

18
arch/um/include/choose-mode.h
View File

@ -8,26 +8,8 @@
#include "uml-config.h"
#if defined(UML_CONFIG_MODE_TT) && defined(UML_CONFIG_MODE_SKAS)
#define CHOOSE_MODE(tt, skas) (mode_tt ? (tt) : (skas))
extern int mode_tt;
static inline void *__choose_mode(void *tt, void *skas) {
return mode_tt ? tt : skas;
}
#define __CHOOSE_MODE(tt, skas) (*( (typeof(tt) *) __choose_mode(&(tt), &(skas))))
#elif defined(UML_CONFIG_MODE_SKAS)
#define CHOOSE_MODE(tt, skas) (skas)
#elif defined(UML_CONFIG_MODE_TT)
#define CHOOSE_MODE(tt, skas) (tt)
#else
#error CONFIG_MODE_SKAS and CONFIG_MODE_TT are both disabled
#endif
#define CHOOSE_MODE_PROC(tt, skas, args...) \
CHOOSE_MODE(tt(args), skas(args))

3
arch/um/include/common-offsets.h
View File

@ -1,9 +1,6 @@
/* for use by sys-$SUBARCH/kernel-offsets.c */
DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
#ifdef CONFIG_MODE_TT
OFFSET(HOST_TASK_EXTERN_PID, task_struct, thread.mode.tt.extern_pid);
#endif
OFFSET(HOST_TASK_REGS, task_struct, thread.regs);
OFFSET(HOST_TASK_PID, task_struct, pid);

4
arch/um/include/irq_user.h
View File

@ -30,8 +30,4 @@ extern void deactivate_fd(int fd, int irqnum);
extern int deactivate_all_fds(void);
extern int activate_ipi(int fd, int pid);
#ifdef CONFIG_MODE_TT
extern void forward_interrupts(int pid);
#endif
#endif

6
arch/um/include/kern_util.h
View File

@ -34,9 +34,6 @@ extern int nsyscalls;
UML_ROUND_DOWN(((unsigned long) addr) + PAGE_SIZE - 1)
extern int kernel_fork(unsigned long flags, int (*fn)(void *), void * arg);
#ifdef UML_CONFIG_MODE_TT
extern unsigned long stack_sp(unsigned long page);
#endif
extern int kernel_thread_proc(void *data);
extern void syscall_segv(int sig);
extern int current_pid(void);
@ -82,9 +79,6 @@ extern void check_stack_overflow(void *ptr);
extern void relay_signal(int sig, union uml_pt_regs *regs);
extern int user_context(unsigned long sp);
extern void timer_irq(union uml_pt_regs *regs);
#ifdef CONFIG_MODE_TT
extern void unprotect_stack(unsigned long stack);
#endif
extern void do_uml_exitcalls(void);
extern int attach_debugger(int idle_pid, int pid, int stop);
extern int config_gdb(char *str);

19
arch/um/include/mode.h
View File

@ -6,25 +6,6 @@
#ifndef __MODE_H__
#define __MODE_H__
#include "uml-config.h"
#ifdef UML_CONFIG_MODE_TT
#include "mode-tt.h"
#endif
#ifdef UML_CONFIG_MODE_SKAS
#include "mode-skas.h"
#endif
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

6
arch/um/include/mode_kern.h
View File

@ -6,12 +6,6 @@
#ifndef __MODE_KERN_H__
#define __MODE_KERN_H__
#ifdef CONFIG_MODE_TT
#include "mode_kern_tt.h"
#endif
#ifdef CONFIG_MODE_SKAS
#include "mode_kern_skas.h"
#endif
#endif

26
arch/um/include/os.h
View File

@ -178,11 +178,7 @@ extern void check_host_supports_tls(int *supports_tls, int *tls_min);
/* Make sure they are clear when running in TT mode. Required by
* SEGV_MAYBE_FIXABLE */
#ifdef UML_CONFIG_MODE_SKAS
#define clear_can_do_skas() do { ptrace_faultinfo = proc_mm = 0; } while (0)
#else
#define clear_can_do_skas() do {} while (0)
#endif
/* mem.c */
extern int create_mem_file(unsigned long long len);
@ -193,18 +189,11 @@ extern int os_process_parent(int pid);
extern void os_stop_process(int pid);
extern void os_kill_process(int pid, int reap_child);
extern void os_kill_ptraced_process(int pid, int reap_child);
#ifdef UML_CONFIG_MODE_TT
extern void os_usr1_process(int pid);
#endif
extern long os_ptrace_ldt(long pid, long addr, long data);
extern int os_getpid(void);
extern int os_getpgrp(void);
#ifdef UML_CONFIG_MODE_TT
extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
extern void stop(void);
#endif
extern void init_new_thread_signals(void);
extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
@ -217,18 +206,6 @@ extern int os_drop_memory(void *addr, int length);
extern int can_drop_memory(void);
extern void os_flush_stdout(void);
/* tt.c
* for tt mode only (will be deleted in future...)
*/
extern void forward_ipi(int fd, int pid);
extern void kill_child_dead(int pid);
extern int wait_for_stop(int pid, int sig, int cont_type, void *relay);
extern int protect_memory(unsigned long addr, unsigned long len,
int r, int w, int x, int must_succeed);
extern void forward_pending_sigio(int target);
extern int start_fork_tramp(void *arg, unsigned long temp_stack,
int clone_flags, int (*tramp)(void *));
/* uaccess.c */
extern unsigned long __do_user_copy(void *to, const void *from, int n,
void **fault_addr, void **fault_catcher,
@ -281,9 +258,6 @@ extern void os_dump_core(void);
extern void switch_timers(int to_real);
extern void idle_sleep(int secs);
extern int set_interval(int is_virtual);
#ifdef CONFIG_MODE_TT
extern void enable_timer(void);
#endif
extern void disable_timer(void);
extern void uml_idle_timer(void);
extern unsigned long long os_nsecs(void);

23
arch/um/include/sysdep-i386/ptrace.h
View File

@ -14,12 +14,7 @@
#define MAX_REG_NR (UM_FRAME_SIZE / sizeof(unsigned long))
#define MAX_REG_OFFSET (UM_FRAME_SIZE)
#ifdef UML_CONFIG_PT_PROXY
extern void update_debugregs(int seq);
#else
static inline void update_debugregs(int seq) {}
#endif
/* syscall emulation path in ptrace */
@ -31,12 +26,6 @@ void set_using_sysemu(int value);
int get_using_sysemu(void);
extern int sysemu_supported;
#ifdef UML_CONFIG_MODE_TT
#include "sysdep/sc.h"
#endif
#ifdef UML_CONFIG_MODE_SKAS
#include "skas_ptregs.h"
#define REGS_IP(r) ((r)[HOST_IP])
@ -60,20 +49,11 @@ extern int sysemu_supported;
#define REGS_RESTART_SYSCALL(r) IP_RESTART_SYSCALL(REGS_IP(r))
#endif
#ifndef PTRACE_SYSEMU_SINGLESTEP
#define PTRACE_SYSEMU_SINGLESTEP 32
#endif
union uml_pt_regs {
#ifdef UML_CONFIG_MODE_TT
struct tt_regs {
long syscall;
void *sc;
struct faultinfo faultinfo;
} tt;
#endif
#ifdef UML_CONFIG_MODE_SKAS
struct skas_regs {
unsigned long regs[MAX_REG_NR];
unsigned long fp[HOST_FP_SIZE];
@ -82,13 +62,10 @@ union uml_pt_regs {
long syscall;
int is_user;
} skas;
#endif
};
#define EMPTY_UML_PT_REGS { }
extern int mode_tt;
#define UPT_SC(r) ((r)->tt.sc)
#define UPT_IP(r) \
__CHOOSE_MODE(SC_IP(UPT_SC(r)), REGS_IP((r)->skas.regs))

4
arch/um/include/sysdep-i386/sigcontext.h
View File

@ -30,11 +30,7 @@
#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
/* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
#ifdef UML_CONFIG_MODE_SKAS
#define SEGV_MAYBE_FIXABLE(fi) ((fi)->trap_no == 0 && ptrace_faultinfo)
#else
#define SEGV_MAYBE_FIXABLE(fi) 0
#endif
extern unsigned long *sc_sigmask(void *sc_ptr);
extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);

3
arch/um/include/sysdep-i386/thread.h
View File

@ -4,8 +4,5 @@
#include <kern_constants.h>
#define TASK_DEBUGREGS(task) ((unsigned long *) &(((char *) (task))[HOST_TASK_DEBUGREGS]))
#ifdef UML_CONFIG_MODE_TT
#define TASK_EXTERN_PID(task) *((int *) &(((char *) (task))[HOST_TASK_EXTERN_PID]))
#endif
#endif

21
arch/um/include/sysdep-x86_64/ptrace.h
View File

@ -1,5 +1,6 @@
/*
* Copyright 2003 PathScale, Inc.
* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*
* Licensed under the GPL
*/
@ -14,11 +15,6 @@
#define MAX_REG_OFFSET (UM_FRAME_SIZE)
#define MAX_REG_NR ((MAX_REG_OFFSET) / sizeof(unsigned long))
#ifdef UML_CONFIG_MODE_TT
#include "sysdep/sc.h"
#endif
#ifdef UML_CONFIG_MODE_SKAS
#include "skas_ptregs.h"
#define REGS_IP(r) ((r)[HOST_IP])
@ -88,21 +84,10 @@
#define REGS_ERR(r) ((r)->fault_type)
#endif
#include "choose-mode.h"
/* XXX */
union uml_pt_regs {
#ifdef UML_CONFIG_MODE_TT
struct tt_regs {
long syscall;
unsigned long orig_rax;
void *sc;
struct faultinfo faultinfo;
} tt;
#endif
#ifdef UML_CONFIG_MODE_SKAS
struct skas_regs {
unsigned long regs[MAX_REG_NR];
unsigned long fp[HOST_FP_SIZE];
@ -110,14 +95,10 @@ union uml_pt_regs {
long syscall;
int is_user;
} skas;
#endif
};
#define EMPTY_UML_PT_REGS { }
/* XXX */
extern int mode_tt;
#define UPT_RBX(r) __CHOOSE_MODE(SC_RBX(UPT_SC(r)), REGS_RBX((r)->skas.regs))
#define UPT_RCX(r) __CHOOSE_MODE(SC_RCX(UPT_SC(r)), REGS_RCX((r)->skas.regs))
#define UPT_RDX(r) __CHOOSE_MODE(SC_RDX(UPT_SC(r)), REGS_RDX((r)->skas.regs))

4
arch/um/include/sysdep-x86_64/thread.h
View File

@ -3,8 +3,4 @@
#include <kern_constants.h>
#ifdef UML_CONFIG_MODE_TT
#define TASK_EXTERN_PID(task) *((int *) &(((char *) (task))[HOST_TASK_EXTERN_PID]))
#endif
#endif

18
arch/um/include/tt/debug.h
View File

@ -1,18 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) and
* Lars Brinkhoff.
* Licensed under the GPL
*/
#ifndef __UML_TT_DEBUG_H
#define __UML_TT_DEBUG_H
extern int debugger_proxy(int status, pid_t pid);
extern void child_proxy(pid_t pid, int status);
extern void init_proxy (pid_t pid, int waiting, int status);
extern int start_debugger(char *prog, int startup, int stop, int *debugger_fd);
extern void fake_child_exit(void);
extern int gdb_config(char *str);
extern int gdb_remove(int unused);
#endif

12
arch/um/include/tt/mmu-tt.h
View File

@ -1,12 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __TT_MMU_H
#define __TT_MMU_H
struct mmu_context_tt {
};
#endif

23
arch/um/include/tt/mode-tt.h
View File

@ -1,23 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __MODE_TT_H__
#define __MODE_TT_H__
#include "sysdep/ptrace.h"
enum { OP_NONE, OP_EXEC, OP_FORK, OP_TRACE_ON, OP_REBOOT, OP_HALT, OP_CB };
extern int tracing_pid;
extern int tracer(int (*init_proc)(void *), void *sp);
extern void sig_handler_common_tt(int sig, void *sc);
extern void syscall_handler_tt(int sig, union uml_pt_regs *regs);
extern void reboot_tt(void);
extern void halt_tt(void);
extern int is_tracer_winch(int pid, int fd, void *data);
extern void kill_off_processes_tt(void);
#endif

40
arch/um/include/tt/mode_kern_tt.h
View File

@ -1,40 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __TT_MODE_KERN_H__
#define __TT_MODE_KERN_H__
#include "linux/sched.h"
#include "asm/page.h"
#include "asm/ptrace.h"
#include "asm/uaccess.h"
extern void switch_to_tt(void *prev, void *next);
extern void flush_thread_tt(void);
extern void start_thread_tt(struct pt_regs *regs, unsigned long eip,
unsigned long esp);
extern int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
unsigned long stack_top, struct task_struct *p,
struct pt_regs *regs);
extern void release_thread_tt(struct task_struct *task);
extern void initial_thread_cb_tt(void (*proc)(void *), void *arg);
extern void init_idle_tt(void);
extern void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end);
extern void flush_tlb_kernel_vm_tt(void);
extern void __flush_tlb_one_tt(unsigned long addr);
extern void flush_tlb_range_tt(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void flush_tlb_mm_tt(struct mm_struct *mm);
extern void force_flush_all_tt(void);
extern long execute_syscall_tt(void *r);
extern void before_mem_tt(unsigned long brk_start);
extern unsigned long set_task_sizes_tt(unsigned long *task_size_out);
extern int start_uml_tt(void);
extern int external_pid_tt(struct task_struct *task);
extern int thread_pid_tt(struct task_struct *task);
#define kmem_end_tt (host_task_size - ABOVE_KMEM)
#endif

37
arch/um/include/tt/tt.h
View File

@ -1,37 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __TT_H__
#define __TT_H__
#include "sysdep/ptrace.h"
extern int gdb_pid;
extern int debug;
extern int debug_stop;
extern int debug_trace;
extern int honeypot;
extern int fork_tramp(void *sig_stack);
extern int do_proc_op(void *t, int proc_id);
extern int tracer(int (*init_proc)(void *), void *sp);
extern void attach_process(int pid);
extern void tracer_panic(char *format, ...)
__attribute__ ((format (printf, 1, 2)));
extern void set_init_pid(int pid);
extern int set_user_mode(void *task);
extern void set_tracing(void *t, int tracing);
extern int is_tracing(void *task);
extern void syscall_handler(int sig, union uml_pt_regs *regs);
extern void exit_kernel(int pid, void *task);
extern void do_syscall(void *task, int pid, int local_using_sysemu);
extern void do_sigtrap(void *task);
extern int is_valid_pid(int pid);
extern void remap_data(void *segment_start, void *segment_end, int w);
extern long execute_syscall_tt(void *r);
#endif

46
arch/um/include/tt/uaccess-tt.h
View File

@ -1,46 +0,0 @@
/*
* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#ifndef __TT_UACCESS_H
#define __TT_UACCESS_H
#include "linux/string.h"
#include "linux/sched.h"
#include "asm/processor.h"
#include "asm/errno.h"
#include "asm/current.h"
#include "asm/a.out.h"
#include "uml_uaccess.h"
#define ABOVE_KMEM (16 * 1024 * 1024)
extern unsigned long end_vm;
extern unsigned long uml_physmem;
#define is_stack(addr, size) \
(((unsigned long) (addr) < STACK_TOP) && \
((unsigned long) (addr) >= STACK_TOP - ABOVE_KMEM) && \
(((unsigned long) (addr) + (size)) <= STACK_TOP))
#define access_ok_tt(type, addr, size) \
(is_stack(addr, size))
extern int __do_copy_from_user(void *to, const void *from, int n,
void **fault_addr, void **fault_catcher);
extern int __do_strncpy_from_user(char *dst, const char *src, size_t n,
void **fault_addr, void **fault_catcher);
extern int __do_clear_user(void *mem, size_t len, void **fault_addr,
void **fault_catcher);
extern int __do_strnlen_user(const char *str, unsigned long n,
void **fault_addr, void **fault_catcher);
extern int copy_from_user_tt(void *to, const void __user *from, int n);
extern int copy_to_user_tt(void __user *to, const void *from, int n);
extern int strncpy_from_user_tt(char *dst, const char __user *src, int count);
extern int __clear_user_tt(void __user *mem, int len);
extern int clear_user_tt(void __user *mem, int len);
extern int strnlen_user_tt(const void __user *str, int len);
#endif

23
arch/um/include/um_mmu.h
View File

@ -8,33 +8,10 @@
#include "uml-config.h"
#include "choose-mode.h"
#ifdef UML_CONFIG_MODE_TT
#include "mmu-tt.h"
#endif
#ifdef UML_CONFIG_MODE_SKAS
#include "mmu-skas.h"
#endif
typedef union mm_context {
#ifdef UML_CONFIG_MODE_TT
struct mmu_context_tt tt;
#endif
#ifdef UML_CONFIG_MODE_SKAS
struct mmu_context_skas skas;
#endif
} mm_context_t;
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

8
arch/um/include/um_uaccess.h
View File

@ -7,15 +7,7 @@
#define __ARCH_UM_UACCESS_H
#include "choose-mode.h"
#ifdef CONFIG_MODE_TT
#include "uaccess-tt.h"
#endif
#ifdef CONFIG_MODE_SKAS
#include "uaccess-skas.h"
#endif
#include "asm/fixmap.h"
#define __under_task_size(addr, size) \

5
arch/um/kernel/Makefile
View File

@ -9,15 +9,12 @@ clean-files :=
obj-y = config.o exec.o exitcode.o init_task.o irq.o ksyms.o mem.o \
physmem.o process.o ptrace.o reboot.o sigio.o \
signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o uaccess.o \
um_arch.o umid.o
um_arch.o umid.o skas/
obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o
obj-$(CONFIG_GCOV) += gmon_syms.o
obj-$(CONFIG_MODE_TT) += tt/
obj-$(CONFIG_MODE_SKAS) += skas/
USER_OBJS := config.o
include arch/um/scripts/Makefile.rules

2
arch/um/kernel/dyn.lds.S
View File

@ -10,8 +10,6 @@ SECTIONS
PROVIDE (__executable_start = START);
. = START + SIZEOF_HEADERS;
.interp : { *(.interp) }
/* Used in arch/um/kernel/mem.c. Any memory between START and __binary_start
* is remapped.*/
__binary_start = .;
. = ALIGN(4096); /* Init code and data */
_text = .;

1
arch/um/kernel/exec.c
View File

@ -57,7 +57,6 @@ static long execve1(char *file, char __user * __user *argv,
SUBARCH_EXECVE1(&current->thread.regs.regs);
#endif
task_unlock(current);
set_cmdline(current_cmd());
}
return(error);
}

7
arch/um/kernel/init_task.c
View File

@ -46,10 +46,3 @@ union thread_union init_thread_union
union thread_union cpu0_irqstack
__attribute__((__section__(".data.init_irqstack"))) =
{ INIT_THREAD_INFO(init_task) };
#ifdef CONFIG_MODE_TT
void unprotect_stack(unsigned long stack)
{
os_protect_memory((void *) stack, THREAD_SIZE, 1, 1, 0);
}
#endif

24
arch/um/kernel/irq.c
View File

@ -339,30 +339,6 @@ int deactivate_all_fds(void)
return 0;
}
#ifdef CONFIG_MODE_TT
void forward_interrupts(int pid)
{
struct irq_fd *irq;
unsigned long flags;
int err;
spin_lock_irqsave(&irq_lock, flags);
for (irq = active_fds; irq != NULL; irq = irq->next) {
err = os_set_owner(irq->fd, pid);
if (err < 0) {
/* XXX Just remove the irq rather than
* print out an infinite stream of these
*/
printk("Failed to forward %d to pid %d, err = %d\n",
irq->fd, pid, -err);
}
irq->pid = pid;
}
spin_unlock_irqrestore(&irq_lock, flags);
}
#endif
/*
* do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific

10
arch/um/kernel/ksyms.c
View File

@ -34,24 +34,14 @@ EXPORT_SYMBOL(get_kmem_end);
EXPORT_SYMBOL(high_physmem);
EXPORT_SYMBOL(empty_zero_page);
EXPORT_SYMBOL(um_virt_to_phys);
EXPORT_SYMBOL(mode_tt);
EXPORT_SYMBOL(handle_page_fault);
EXPORT_SYMBOL(find_iomem);
#ifdef CONFIG_MODE_TT
EXPORT_SYMBOL(stop);
EXPORT_SYMBOL(strncpy_from_user_tt);
EXPORT_SYMBOL(copy_from_user_tt);
EXPORT_SYMBOL(copy_to_user_tt);
#endif
#ifdef CONFIG_MODE_SKAS
EXPORT_SYMBOL(strnlen_user_skas);
EXPORT_SYMBOL(strncpy_from_user_skas);
EXPORT_SYMBOL(copy_to_user_skas);
EXPORT_SYMBOL(copy_from_user_skas);
EXPORT_SYMBOL(clear_user_skas);
#endif
EXPORT_SYMBOL(uml_strdup);
EXPORT_SYMBOL(os_stat_fd);

7
arch/um/kernel/process.c
View File

@ -183,13 +183,6 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
kmalloc_ok = save_kmalloc_ok;
}
#ifdef CONFIG_MODE_TT
unsigned long stack_sp(unsigned long page)
{
return page + PAGE_SIZE - sizeof(void *);
}
#endif
void default_idle(void)
{
CHOOSE_MODE(uml_idle_timer(), (void) 0);

19
arch/um/kernel/reboot.c
View File

@ -14,28 +14,9 @@
void (*pm_power_off)(void);
#ifdef CONFIG_SMP
static void kill_idlers(int me)
{
#ifdef CONFIG_MODE_TT
struct task_struct *p;
int i;
for(i = 0; i < ARRAY_SIZE(idle_threads); i++){
p = idle_threads[i];
if((p != NULL) && (p->thread.mode.tt.extern_pid != me))
os_kill_process(p->thread.mode.tt.extern_pid, 0);
}
#endif
}
#endif
static void kill_off_processes(void)
{
CHOOSE_MODE(kill_off_processes_tt(), kill_off_processes_skas());
#ifdef CONFIG_SMP
kill_idlers(os_getpid());
#endif
}
void uml_cleanup(void)

5
arch/um/kernel/smp.c
View File

@ -95,7 +95,6 @@ static int idle_proc(void *cpup)
static struct task_struct *idle_thread(int cpu)
{
struct task_struct *new_task;
unsigned char c;
current->thread.request.u.thread.proc = idle_proc;
current->thread.request.u.thread.arg = (void *) cpu;
@ -108,9 +107,7 @@ static struct task_struct *idle_thread(int cpu)
{ .pid = new_task->thread.mode.tt.extern_pid,
.task = new_task } );
idle_threads[cpu] = new_task;
CHOOSE_MODE(os_write_file(new_task->thread.mode.tt.switch_pipe[1], &c,
sizeof(c)),
({ panic("skas mode doesn't support SMP"); }));
panic("skas mode doesn't support SMP");
return new_task;
}

2
arch/um/kernel/trap.c
View File

@ -29,9 +29,7 @@
#include "sysdep/sigcontext.h"
#include "sysdep/ptrace.h"
#include "os.h"
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
#endif
#include "os.h"
/* Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by segv(). */

14
arch/um/kernel/tt/Makefile
View File

@ -1,14 +0,0 @@
#
# Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
# Licensed under the GPL
#
obj-y = exec_kern.o exec_user.o gdb.o ksyms.o mem.o mem_user.o process_kern.o \
syscall_kern.o syscall_user.o tlb.o tracer.o trap_user.o \
uaccess.o uaccess_user.o
obj-$(CONFIG_PT_PROXY) += gdb_kern.o ptproxy/
USER_OBJS := gdb.o tracer.o
include arch/um/scripts/Makefile.rules

84
arch/um/kernel/tt/exec_kern.c
View File

@ -1,84 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/kernel.h"
#include "linux/mm.h"
#include "asm/signal.h"
#include "asm/ptrace.h"
#include "asm/uaccess.h"
#include "asm/pgalloc.h"
#include "asm/tlbflush.h"
#include "kern_util.h"
#include "irq_user.h"
#include "mem_user.h"
#include "os.h"
#include "tlb.h"
#include "mode.h"
static int exec_tramp(void *sig_stack)
{
init_new_thread_stack(sig_stack, NULL);
init_new_thread_signals();
os_stop_process(os_getpid());
return(0);
}
void flush_thread_tt(void)
{
unsigned long stack;
int new_pid;
stack = alloc_stack(0, 0);
if(stack == 0){
printk(KERN_ERR
"flush_thread : failed to allocate temporary stack\n");
do_exit(SIGKILL);
}
new_pid = start_fork_tramp(task_stack_page(current), stack, 0, exec_tramp);
if(new_pid < 0){
printk(KERN_ERR
"flush_thread : new thread failed, errno = %d\n",
-new_pid);
do_exit(SIGKILL);
}
if(current_thread->cpu == 0)
forward_interrupts(new_pid);
current->thread.request.op = OP_EXEC;
current->thread.request.u.exec.pid = new_pid;
unprotect_stack((unsigned long) current_thread);
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
change_sig(SIGUSR1, 0);
enable_timer();
free_page(stack);
protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
stack_protections((unsigned long) current_thread);
force_flush_all();
unblock_signals();
}
void start_thread_tt(struct pt_regs *regs, unsigned long eip,
unsigned long esp)
{
set_fs(USER_DS);
flush_tlb_mm(current->mm);
PT_REGS_IP(regs) = eip;
PT_REGS_SP(regs) = esp;
PT_FIX_EXEC_STACK(esp);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

56
arch/um/kernel/tt/exec_user.c
View File

@ -1,56 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sched.h>
#include <errno.h>
#include <sys/wait.h>
#include <signal.h>
#include "kern_util.h"
#include "user.h"
#include "ptrace_user.h"
#include "os.h"
void do_exec(int old_pid, int new_pid)
{
unsigned long regs[FRAME_SIZE];
int err;
if((ptrace(PTRACE_ATTACH, new_pid, 0, 0) < 0) ||
(ptrace(PTRACE_CONT, new_pid, 0, 0) < 0))
tracer_panic("do_exec failed to attach proc - errno = %d",
errno);
CATCH_EINTR(err = waitpid(new_pid, 0, WUNTRACED));
if (err < 0)
tracer_panic("do_exec failed to attach proc in waitpid - errno = %d",
errno);
if(ptrace_getregs(old_pid, regs) < 0)
tracer_panic("do_exec failed to get registers - errno = %d",
errno);
os_kill_ptraced_process(old_pid, 0);
if (ptrace(PTRACE_OLDSETOPTIONS, new_pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
tracer_panic("do_exec: PTRACE_SETOPTIONS failed, errno = %d", errno);
if(ptrace_setregs(new_pid, regs) < 0)
tracer_panic("do_exec failed to start new proc - errno = %d",
errno);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

280
arch/um/kernel/tt/gdb.c
View File

@ -1,280 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include "ptrace_user.h"
#include "uml-config.h"
#include "kern_constants.h"
#include "chan_user.h"
#include "init.h"
#include "user.h"
#include "debug.h"
#include "kern_util.h"
#include "tt.h"
#include "sysdep/thread.h"
#include "os.h"
extern int debugger_pid;
extern int debugger_fd;
extern int debugger_parent;
int detach(int pid, int sig)
{
return(ptrace(PTRACE_DETACH, pid, 0, sig));
}
int attach(int pid)
{
int err;
err = ptrace(PTRACE_ATTACH, pid, 0, 0);
if(err < 0) return(-errno);
else return(err);
}
int cont(int pid)
{
return(ptrace(PTRACE_CONT, pid, 0, 0));
}
#ifdef UML_CONFIG_PT_PROXY
int debugger_signal(int status, pid_t pid)
{
return(debugger_proxy(status, pid));
}
void child_signal(pid_t pid, int status)
{
child_proxy(pid, status);
}
static void gdb_announce(char *dev_name, int dev)
{
printf("gdb assigned device '%s'\n", dev_name);
}
static struct chan_opts opts = {
.announce = gdb_announce,
.xterm_title = "UML kernel debugger",
.raw = 0,
.tramp_stack = 0,
.in_kernel = 0,
};
/* Accessed by the tracing thread, which automatically serializes access */
static void *xterm_data;
static int xterm_fd;
extern void *xterm_init(char *, int, struct chan_opts *);
extern int xterm_open(int, int, int, void *, char **);
extern void xterm_close(int, void *);
int open_gdb_chan(void)
{
char stack[UM_KERN_PAGE_SIZE], *dummy;
opts.tramp_stack = (unsigned long) stack;
xterm_data = xterm_init("", 0, &opts);
xterm_fd = xterm_open(1, 1, 1, xterm_data, &dummy);
return(xterm_fd);
}
static void exit_debugger_cb(void *unused)
{
if(debugger_pid != -1){
if(gdb_pid != -1){
fake_child_exit();
gdb_pid = -1;
}
else kill_child_dead(debugger_pid);
debugger_pid = -1;
if(debugger_parent != -1)
detach(debugger_parent, SIGINT);
}
if(xterm_data != NULL) xterm_close(xterm_fd, xterm_data);
}
static void exit_debugger(void)
{
initial_thread_cb(exit_debugger_cb, NULL);
}
__uml_exitcall(exit_debugger);
struct gdb_data {
char *str;
int err;
};
extern char *linux_prog;
static void config_gdb_cb(void *arg)
{
struct gdb_data *data = arg;
void *task;
int pid;
data->err = -1;
if(debugger_pid != -1) exit_debugger_cb(NULL);
if(!strncmp(data->str, "pid,", strlen("pid,"))){
data->str += strlen("pid,");
pid = strtoul(data->str, NULL, 0);
task = cpu_tasks[0].task;
debugger_pid = attach_debugger(TASK_EXTERN_PID(task), pid, 0);
if(debugger_pid != -1){
data->err = 0;
gdb_pid = pid;
}
return;
}
data->err = 0;
debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
init_proxy(debugger_pid, 0, 0);
}
int gdb_config(char *str, char **error_out)
{
struct gdb_data data;
if(*str++ != '=') return(-1);
data.str = str;
initial_thread_cb(config_gdb_cb, &data);
return(data.err);
}
void remove_gdb_cb(void *unused)
{
exit_debugger_cb(NULL);
}
int gdb_remove(int unused, char **error_out)
{
initial_thread_cb(remove_gdb_cb, NULL);
return 0;
}
void signal_usr1(int sig)
{
if(debugger_pid != -1){
printf("The debugger is already running\n");
return;
}
debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
init_proxy(debugger_pid, 0, 0);
}
int init_ptrace_proxy(int idle_pid, int startup, int stop)
{
int pid, status;
pid = start_debugger(linux_prog, startup, stop, &debugger_fd);
status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
if(pid < 0){
cont(idle_pid);
return(-1);
}
init_proxy(pid, 1, status);
return(pid);
}
int attach_debugger(int idle_pid, int pid, int stop)
{
int status = 0, err;
err = attach(pid);
if(err < 0){
printf("Failed to attach pid %d, errno = %d\n", pid, -err);
return(-1);
}
if(stop) status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
init_proxy(pid, 1, status);
return(pid);
}
#ifdef notdef /* Put this back in when it does something useful */
static int __init uml_gdb_init_setup(char *line, int *add)
{
gdb_init = uml_strdup(line);
return 0;
}
__uml_setup("gdb=", uml_gdb_init_setup,
"gdb=<channel description>\n\n"
);
#endif
static int __init uml_gdb_pid_setup(char *line, int *add)
{
gdb_pid = strtoul(line, NULL, 0);
*add = 0;
return 0;
}
__uml_setup("gdb-pid=", uml_gdb_pid_setup,
"gdb-pid=<pid>\n"
" gdb-pid is used to attach an external debugger to UML. This may be\n"
" an already-running gdb or a debugger-like process like strace.\n\n"
);
#else
int debugger_signal(int status, pid_t pid){ return(0); }
void child_signal(pid_t pid, int status){ }
int init_ptrace_proxy(int idle_pid, int startup, int stop)
{
printf("debug requested when CONFIG_PT_PROXY is off\n");
kill_child_dead(idle_pid);
exit(1);
}
void signal_usr1(int sig)
{
printf("debug requested when CONFIG_PT_PROXY is off\n");
}
int attach_debugger(int idle_pid, int pid, int stop)
{
printf("attach_debugger called when CONFIG_PT_PROXY "
"is off\n");
return(-1);
}
int config_gdb(char *str)
{
return(-1);
}
int remove_gdb(void)
{
return(-1);
}
int init_parent_proxy(int pid)
{
return(-1);
}
void debugger_parent_signal(int status, int pid)
{
}
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

40
arch/um/kernel/tt/gdb_kern.c
View File

@ -1,40 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/init.h"
#include "mconsole_kern.h"
#ifdef CONFIG_MCONSOLE
extern int gdb_config(char *str, char **error_out);
extern int gdb_remove(int n, char **error_out);
static struct mc_device gdb_mc = {
.list = INIT_LIST_HEAD(gdb_mc.list),
.name = "gdb",
.config = gdb_config,
.remove = gdb_remove,
};
int gdb_mc_init(void)
{
mconsole_register_dev(&gdb_mc);
return(0);
}
__initcall(gdb_mc_init);
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

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arch/um/kernel/tt/include/mode-tt.h
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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __MODE_TT_H__
#define __MODE_TT_H__
#include "sysdep/ptrace.h"
enum { OP_NONE, OP_EXEC, OP_FORK, OP_TRACE_ON, OP_REBOOT, OP_HALT, OP_CB };
extern int tracing_pid;
extern int tracer(int (*init_proc)(void *), void *sp);
extern void sig_handler_common_tt(int sig, void *sc);
extern void syscall_handler_tt(int sig, union uml_pt_regs *regs);
extern void reboot_tt(void);
extern void halt_tt(void);
extern int is_tracer_winch(int pid, int fd, void *data);
extern void kill_off_processes_tt(void);
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

29
arch/um/kernel/tt/ksyms.c
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/*
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/module.h"
#include "asm/uaccess.h"
#include "mode.h"
EXPORT_SYMBOL(__do_copy_from_user);
EXPORT_SYMBOL(__do_copy_to_user);
EXPORT_SYMBOL(__do_strncpy_from_user);
EXPORT_SYMBOL(__do_strnlen_user);
EXPORT_SYMBOL(__do_clear_user);
EXPORT_SYMBOL(clear_user_tt);
EXPORT_SYMBOL(tracing_pid);
EXPORT_SYMBOL(honeypot);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

34
arch/um/kernel/tt/mem.c
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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/stddef.h"
#include "linux/mm.h"
#include "asm/uaccess.h"
#include "mem_user.h"
#include "kern_util.h"
#include "kern.h"
#include "tt.h"
void before_mem_tt(unsigned long brk_start)
{
if(debug)
remap_data(UML_ROUND_DOWN(&_stext), UML_ROUND_UP(&_etext), 1);
remap_data(UML_ROUND_DOWN(&_sdata), UML_ROUND_UP(&_edata), 1);
remap_data(UML_ROUND_DOWN(&__bss_start), UML_ROUND_UP(&_end), 1);
}
#define SIZE ((CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS) * 0x20000000)
#define START (CONFIG_TOP_ADDR - SIZE)
unsigned long set_task_sizes_tt(unsigned long *task_size_out)
{
unsigned long host_task_size;
/* Round up to the nearest 4M */
host_task_size = ROUND_4M((unsigned long) &host_task_size);
*task_size_out = START;
return host_task_size;
}

49
arch/um/kernel/tt/mem_user.c
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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#include "tt.h"
#include "mem_user.h"
#include "os.h"
void remap_data(void *segment_start, void *segment_end, int w)
{
void *addr;
unsigned long size;
int data, prot;
if(w) prot = PROT_WRITE;
else prot = 0;
prot |= PROT_READ | PROT_EXEC;
size = (unsigned long) segment_end -
(unsigned long) segment_start;
data = create_mem_file(size);
addr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, data, 0);
if(addr == MAP_FAILED){
perror("mapping new data segment");
exit(1);
}
memcpy(addr, segment_start, size);
if(switcheroo(data, prot, addr, segment_start, size) < 0){
printf("switcheroo failed\n");
exit(1);
}
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

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arch/um/kernel/tt/process_kern.c
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/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/sched.h"
#include "linux/signal.h"
#include "linux/kernel.h"
#include "linux/interrupt.h"
#include "linux/ptrace.h"
#include "asm/system.h"
#include "asm/pgalloc.h"
#include "asm/ptrace.h"
#include "asm/tlbflush.h"
#include "irq_user.h"
#include "kern_util.h"
#include "os.h"
#include "kern.h"
#include "sigcontext.h"
#include "mem_user.h"
#include "tlb.h"
#include "mode.h"
#include "mode_kern.h"
#include "init.h"
#include "tt.h"
void switch_to_tt(void *prev, void *next)
{
struct task_struct *from, *to, *prev_sched;
unsigned long flags;
int err, vtalrm, alrm, prof, cpu;
char c;
from = prev;
to = next;
cpu = task_thread_info(from)->cpu;
if(cpu == 0)
forward_interrupts(to->thread.mode.tt.extern_pid);
#ifdef CONFIG_SMP
forward_ipi(cpu_data[cpu].ipi_pipe[0], to->thread.mode.tt.extern_pid);
#endif
local_irq_save(flags);
vtalrm = change_sig(SIGVTALRM, 0);
alrm = change_sig(SIGALRM, 0);
prof = change_sig(SIGPROF, 0);
forward_pending_sigio(to->thread.mode.tt.extern_pid);
c = 0;
/* Notice that here we "up" the semaphore on which "to" is waiting, and
* below (the read) we wait on this semaphore (which is implemented by
* switch_pipe) and go sleeping. Thus, after that, we have resumed in
* "to", and can't use any more the value of "from" (which is outdated),
* nor the value in "to" (since it was the task which stole us the CPU,
* which we don't care about). */
err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
if(err != sizeof(c))
panic("write of switch_pipe failed, err = %d", -err);
if(from->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(os_getpid(), 0);
err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c,
sizeof(c));
if(err != sizeof(c))
panic("read of switch_pipe failed, errno = %d", -err);
/* If the process that we have just scheduled away from has exited,
* then it needs to be killed here. The reason is that, even though
* it will kill itself when it next runs, that may be too late. Its
* stack will be freed, possibly before then, and if that happens,
* we have a use-after-free situation. So, it gets killed here
* in case it has not already killed itself.
*/
prev_sched = current->thread.prev_sched;
if(prev_sched->thread.mode.tt.switch_pipe[0] == -1)
os_kill_process(prev_sched->thread.mode.tt.extern_pid, 1);
change_sig(SIGVTALRM, vtalrm);
change_sig(SIGALRM, alrm);
change_sig(SIGPROF, prof);
arch_switch_to_tt(prev_sched, current);
flush_tlb_all();
local_irq_restore(flags);
}
void release_thread_tt(struct task_struct *task)
{
int pid = task->thread.mode.tt.extern_pid;
/*
* We first have to kill the other process, before
* closing its switch_pipe. Else it might wake up
* and receive "EOF" before we could kill it.
*/
if(os_getpid() != pid)
os_kill_process(pid, 0);
os_close_file(task->thread.mode.tt.switch_pipe[0]);
os_close_file(task->thread.mode.tt.switch_pipe[1]);
/* use switch_pipe as flag: thread is released */
task->thread.mode.tt.switch_pipe[0] = -1;
}
void suspend_new_thread(int fd)
{
int err;
char c;
os_stop_process(os_getpid());
err = os_read_file(fd, &c, sizeof(c));
if(err != sizeof(c))
panic("read failed in suspend_new_thread, err = %d", -err);
}
void schedule_tail(struct task_struct *prev);
static void new_thread_handler(int sig)
{
unsigned long disable;
int (*fn)(void *);
void *arg;
fn = current->thread.request.u.thread.proc;
arg = current->thread.request.u.thread.arg;
UPT_SC(&current->thread.regs.regs) = (void *) (&sig + 1);
disable = (1 << (SIGVTALRM - 1)) | (1 << (SIGALRM - 1)) |
(1 << (SIGIO - 1)) | (1 << (SIGPROF - 1));
SC_SIGMASK(UPT_SC(&current->thread.regs.regs)) &= ~disable;
suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
force_flush_all();
if(current->thread.prev_sched != NULL)
schedule_tail(current->thread.prev_sched);
current->thread.prev_sched = NULL;
init_new_thread_signals();
enable_timer();
free_page(current->thread.temp_stack);
set_cmdline("(kernel thread)");
change_sig(SIGUSR1, 1);
change_sig(SIGPROF, 1);
local_irq_enable();
if(!run_kernel_thread(fn, arg, &current->thread.exec_buf))
do_exit(0);
/* XXX No set_user_mode here because a newly execed process will
* immediately segfault on its non-existent IP, coming straight back
* to the signal handler, which will call set_user_mode on its way
* out. This should probably change since it's confusing.
*/
}
static int new_thread_proc(void *stack)
{
/* local_irq_disable is needed to block out signals until this thread is
* properly scheduled. Otherwise, the tracing thread will get mighty
* upset about any signals that arrive before that.
* This has the complication that it sets the saved signal mask in
* the sigcontext to block signals. This gets restored when this
* thread (or a descendant, since they get a copy of this sigcontext)
* returns to userspace.
* So, this is compensated for elsewhere.
* XXX There is still a small window until local_irq_disable() actually
* finishes where signals are possible - shouldn't be a problem in
* practice since SIGIO hasn't been forwarded here yet, and the
* local_irq_disable should finish before a SIGVTALRM has time to be
* delivered.
*/
local_irq_disable();
init_new_thread_stack(stack, new_thread_handler);
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
return(0);
}
/* Signal masking - signals are blocked at the start of fork_tramp. They
* are re-enabled when finish_fork_handler is entered by fork_tramp hitting
* itself with a SIGUSR1. set_user_mode has to be run with SIGUSR1 off,
* so it is blocked before it's called. They are re-enabled on sigreturn
* despite the fact that they were blocked when the SIGUSR1 was issued because
* copy_thread copies the parent's sigcontext, including the signal mask
* onto the signal frame.
*/
void finish_fork_handler(int sig)
{
UPT_SC(&current->thread.regs.regs) = (void *) (&sig + 1);
suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
force_flush_all();
if(current->thread.prev_sched != NULL)
schedule_tail(current->thread.prev_sched);
current->thread.prev_sched = NULL;
enable_timer();
change_sig(SIGVTALRM, 1);
local_irq_enable();
if(current->mm != current->parent->mm)
protect_memory(uml_reserved, high_physmem - uml_reserved, 1,
1, 0, 1);
stack_protections((unsigned long) current_thread);
free_page(current->thread.temp_stack);
local_irq_disable();
change_sig(SIGUSR1, 0);
set_user_mode(current);
}
int fork_tramp(void *stack)
{
local_irq_disable();
arch_init_thread();
init_new_thread_stack(stack, finish_fork_handler);
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
return(0);
}
int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
unsigned long stack_top, struct task_struct * p,
struct pt_regs *regs)
{
int (*tramp)(void *);
int new_pid, err;
unsigned long stack;
if(current->thread.forking)
tramp = fork_tramp;
else {
tramp = new_thread_proc;
p->thread.request.u.thread = current->thread.request.u.thread;
}
err = os_pipe(p->thread.mode.tt.switch_pipe, 1, 1);
if(err < 0){
printk("copy_thread : pipe failed, err = %d\n", -err);
return(err);
}
stack = alloc_stack(0, 0);
if(stack == 0){
printk(KERN_ERR "copy_thread : failed to allocate "
"temporary stack\n");
return(-ENOMEM);
}
clone_flags &= CLONE_VM;
p->thread.temp_stack = stack;
new_pid = start_fork_tramp(task_stack_page(p), stack, clone_flags, tramp);
if(new_pid < 0){
printk(KERN_ERR "copy_thread : clone failed - errno = %d\n",
-new_pid);
return(new_pid);
}
if(current->thread.forking){
sc_to_sc(UPT_SC(&p->thread.regs.regs), UPT_SC(&regs->regs));
SC_SET_SYSCALL_RETURN(UPT_SC(&p->thread.regs.regs), 0);
if(sp != 0)
SC_SP(UPT_SC(&p->thread.regs.regs)) = sp;
}
p->thread.mode.tt.extern_pid = new_pid;
current->thread.request.op = OP_FORK;
current->thread.request.u.fork.pid = new_pid;
os_usr1_process(os_getpid());
/* Enable the signal and then disable it to ensure that it is handled
* here, and nowhere else.
*/
change_sig(SIGUSR1, 1);
change_sig(SIGUSR1, 0);
err = 0;
return(err);
}
void reboot_tt(void)
{
current->thread.request.op = OP_REBOOT;
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
}
void halt_tt(void)
{
current->thread.request.op = OP_HALT;
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
}
void kill_off_processes_tt(void)
{
struct task_struct *p;
int me;
me = os_getpid();
for_each_process(p){
if(p->thread.mode.tt.extern_pid != me)
os_kill_process(p->thread.mode.tt.extern_pid, 0);
}
if(init_task.thread.mode.tt.extern_pid != me)
os_kill_process(init_task.thread.mode.tt.extern_pid, 0);
}
void initial_thread_cb_tt(void (*proc)(void *), void *arg)
{
if(os_getpid() == tracing_pid){
(*proc)(arg);
}
else {
current->thread.request.op = OP_CB;
current->thread.request.u.cb.proc = proc;
current->thread.request.u.cb.arg = arg;
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
change_sig(SIGUSR1, 0);
}
}
int do_proc_op(void *t, int proc_id)
{
struct task_struct *task;
struct thread_struct *thread;
int op, pid;
task = t;
thread = &task->thread;
op = thread->request.op;
switch(op){
case OP_NONE:
case OP_TRACE_ON:
break;
case OP_EXEC:
pid = thread->request.u.exec.pid;
do_exec(thread->mode.tt.extern_pid, pid);
thread->mode.tt.extern_pid = pid;
cpu_tasks[task_thread_info(task)->cpu].pid = pid;
break;
case OP_FORK:
attach_process(thread->request.u.fork.pid);
break;
case OP_CB:
(*thread->request.u.cb.proc)(thread->request.u.cb.arg);
break;
case OP_REBOOT:
case OP_HALT:
break;
default:
tracer_panic("Bad op in do_proc_op");
break;
}
thread->request.op = OP_NONE;
return(op);
}
void init_idle_tt(void)
{
default_idle();
}
extern void start_kernel(void);
static int start_kernel_proc(void *unused)
{
int pid;
block_signals();
pid = os_getpid();
cpu_tasks[0].pid = pid;
cpu_tasks[0].task = current;
#ifdef CONFIG_SMP
cpu_online_map = cpumask_of_cpu(0);
#endif
if(debug) os_stop_process(pid);
start_kernel();
return(0);
}
void set_tracing(void *task, int tracing)
{
((struct task_struct *) task)->thread.mode.tt.tracing = tracing;
}
int is_tracing(void *t)
{
return (((struct task_struct *) t)->thread.mode.tt.tracing);
}
int set_user_mode(void *t)
{
struct task_struct *task;
task = t ? t : current;
if(task->thread.mode.tt.tracing)
return(1);
task->thread.request.op = OP_TRACE_ON;
os_usr1_process(os_getpid());
return(0);
}
void set_init_pid(int pid)
{
int err;
init_task.thread.mode.tt.extern_pid = pid;
err = os_pipe(init_task.thread.mode.tt.switch_pipe, 1, 1);
if(err)
panic("Can't create switch pipe for init_task, errno = %d",
-err);
}
int start_uml_tt(void)
{
void *sp;
int pages;
pages = (1 << CONFIG_KERNEL_STACK_ORDER);
sp = task_stack_page(&init_task) +
pages * PAGE_SIZE - sizeof(unsigned long);
return(tracer(start_kernel_proc, sp));
}
int external_pid_tt(struct task_struct *task)
{
return(task->thread.mode.tt.extern_pid);
}
int thread_pid_tt(struct task_struct *task)
{
return(task->thread.mode.tt.extern_pid);
}
int is_valid_pid(int pid)
{
struct task_struct *task;
read_lock(&tasklist_lock);
for_each_process(task){
if(task->thread.mode.tt.extern_pid == pid){
read_unlock(&tasklist_lock);
return(1);
}
}
read_unlock(&tasklist_lock);
return(0);
}

10
arch/um/kernel/tt/ptproxy/Makefile
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#
# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
# Licensed under the GPL
#
obj-y = proxy.o ptrace.o sysdep.o wait.o
USER_OBJS := $(obj-y)
include arch/um/scripts/Makefile.rules

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arch/um/kernel/tt/ptproxy/proxy.c
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/**********************************************************************
proxy.c
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
Jeff Dike (jdike@karaya.com) : Modified for integration into uml
**********************************************************************/
/* XXX This file shouldn't refer to CONFIG_* */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <termios.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <asm/unistd.h>
#include "ptrace_user.h"
#include "ptproxy.h"
#include "sysdep.h"
#include "wait.h"
#include "user.h"
#include "os.h"
#include "tempfile.h"
static int debugger_wait(debugger_state *debugger, int *status, int options,
int (*syscall)(debugger_state *debugger, pid_t child),
int (*normal_return)(debugger_state *debugger,
pid_t unused),
int (*wait_return)(debugger_state *debugger,
pid_t unused))
{
if(debugger->real_wait){
debugger->handle_trace = normal_return;
syscall_continue(debugger->pid);
debugger->real_wait = 0;
return(1);
}
debugger->wait_status_ptr = status;
debugger->wait_options = options;
if((debugger->debugee != NULL) && debugger->debugee->event){
syscall_continue(debugger->pid);
wait_for_stop(debugger->pid, SIGTRAP, PTRACE_SYSCALL,
NULL);
(*wait_return)(debugger, -1);
return(0);
}
else if(debugger->wait_options & WNOHANG){
syscall_cancel(debugger->pid, 0);
debugger->handle_trace = syscall;
return(0);
}
else {
syscall_pause(debugger->pid);
debugger->handle_trace = wait_return;
debugger->waiting = 1;
}
return(1);
}
/*
* Handle debugger trap, i.e. syscall.
*/
int debugger_syscall(debugger_state *debugger, pid_t child)
{
long arg1, arg2, arg3, arg4, arg5, result;
int syscall, ret = 0;
syscall = get_syscall(debugger->pid, &arg1, &arg2, &arg3, &arg4,
&arg5);
switch(syscall){
case __NR_execve:
/* execve never returns */
debugger->handle_trace = debugger_syscall;
break;
case __NR_ptrace:
if(debugger->debugee->pid != 0) arg2 = debugger->debugee->pid;
if(!debugger->debugee->in_context)
child = debugger->debugee->pid;
result = proxy_ptrace(debugger, arg1, arg2, arg3, arg4, child,
&ret);
syscall_cancel(debugger->pid, result);
debugger->handle_trace = debugger_syscall;
return(ret);
#ifdef __NR_waitpid
case __NR_waitpid:
#endif
case __NR_wait4:
if(!debugger_wait(debugger, (int *) arg2, arg3,
debugger_syscall, debugger_normal_return,
proxy_wait_return))
return(0);
break;
case __NR_kill:
if(!debugger->debugee->in_context)
child = debugger->debugee->pid;
if(arg1 == debugger->debugee->pid){
result = kill(child, arg2);
syscall_cancel(debugger->pid, result);
debugger->handle_trace = debugger_syscall;
return(0);
}
else debugger->handle_trace = debugger_normal_return;
break;
default:
debugger->handle_trace = debugger_normal_return;
}
syscall_continue(debugger->pid);
return(0);
}
/* Used by the tracing thread */
static debugger_state parent;
static int parent_syscall(debugger_state *debugger, int pid);
int init_parent_proxy(int pid)
{
parent = ((debugger_state) { .pid = pid,
.wait_options = 0,
.wait_status_ptr = NULL,
.waiting = 0,
.real_wait = 0,
.expecting_child = 0,
.handle_trace = parent_syscall,
.debugee = NULL } );
return(0);
}
int parent_normal_return(debugger_state *debugger, pid_t unused)
{
debugger->handle_trace = parent_syscall;
syscall_continue(debugger->pid);
return(0);
}
static int parent_syscall(debugger_state *debugger, int pid)
{
long arg1, arg2, arg3, arg4, arg5;
int syscall;
syscall = get_syscall(pid, &arg1, &arg2, &arg3, &arg4, &arg5);
if((syscall == __NR_wait4)
#ifdef __NR_waitpid
|| (syscall == __NR_waitpid)
#endif
){
debugger_wait(&parent, (int *) arg2, arg3, parent_syscall,
parent_normal_return, parent_wait_return);
}
else ptrace(PTRACE_SYSCALL, pid, 0, 0);
return(0);
}
int debugger_normal_return(debugger_state *debugger, pid_t unused)
{
debugger->handle_trace = debugger_syscall;
syscall_continue(debugger->pid);
return(0);
}
void debugger_cancelled_return(debugger_state *debugger, int result)
{
debugger->handle_trace = debugger_syscall;
syscall_set_result(debugger->pid, result);
syscall_continue(debugger->pid);
}
/* Used by the tracing thread */
static debugger_state debugger;
static debugee_state debugee;
void init_proxy (pid_t debugger_pid, int stopped, int status)
{
debugger.pid = debugger_pid;
debugger.handle_trace = debugger_syscall;
debugger.debugee = &debugee;
debugger.waiting = 0;
debugger.real_wait = 0;
debugger.expecting_child = 0;
debugee.pid = 0;
debugee.traced = 0;
debugee.stopped = stopped;
debugee.event = 0;
debugee.zombie = 0;
debugee.died = 0;
debugee.wait_status = status;
debugee.in_context = 1;
}
int debugger_proxy(int status, int pid)
{
int ret = 0, sig;
if(WIFSTOPPED(status)){
sig = WSTOPSIG(status);
if (sig == SIGTRAP)
ret = (*debugger.handle_trace)(&debugger, pid);
else if(sig == SIGCHLD){
if(debugger.expecting_child){
ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
debugger.expecting_child = 0;
}
else if(debugger.waiting)
real_wait_return(&debugger);
else {
ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
debugger.real_wait = 1;
}
}
else ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
}
else if(WIFEXITED(status)){
tracer_panic("debugger (pid %d) exited with status %d",
debugger.pid, WEXITSTATUS(status));
}
else if(WIFSIGNALED(status)){
tracer_panic("debugger (pid %d) exited with signal %d",
debugger.pid, WTERMSIG(status));
}
else {
tracer_panic("proxy got unknown status (0x%x) on debugger "
"(pid %d)", status, debugger.pid);
}
return(ret);
}
void child_proxy(pid_t pid, int status)
{
debugee.event = 1;
debugee.wait_status = status;
if(WIFSTOPPED(status)){
debugee.stopped = 1;
debugger.expecting_child = 1;
kill(debugger.pid, SIGCHLD);
}
else if(WIFEXITED(status) || WIFSIGNALED(status)){
debugee.zombie = 1;
debugger.expecting_child = 1;
kill(debugger.pid, SIGCHLD);
}
else panic("proxy got unknown status (0x%x) on child (pid %d)",
status, pid);
}
void debugger_parent_signal(int status, int pid)
{
int sig;
if(WIFSTOPPED(status)){
sig = WSTOPSIG(status);
if(sig == SIGTRAP) (*parent.handle_trace)(&parent, pid);
else ptrace(PTRACE_SYSCALL, pid, 0, sig);
}
}
void fake_child_exit(void)
{
int status, pid;
child_proxy(1, W_EXITCODE(0, 0));
while(debugger.waiting == 1){
CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
if(pid != debugger.pid){
printk("fake_child_exit - waitpid failed, "
"errno = %d\n", errno);
return;
}
debugger_proxy(status, debugger.pid);
}
CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
if(pid != debugger.pid){
printk("fake_child_exit - waitpid failed, "
"errno = %d\n", errno);
return;
}
if(ptrace(PTRACE_DETACH, debugger.pid, 0, SIGCONT) < 0)
printk("fake_child_exit - PTRACE_DETACH failed, errno = %d\n",
errno);
}
char gdb_init_string[] =
"att 1 \n\
b panic \n\
b stop \n\
handle SIGWINCH nostop noprint pass \n\
";
int start_debugger(char *prog, int startup, int stop, int *fd_out)
{
int slave, child;
slave = open_gdb_chan();
child = fork();
if(child == 0){
char *tempname = NULL;
int fd;
if(setsid() < 0) perror("setsid");
if((dup2(slave, 0) < 0) || (dup2(slave, 1) < 0) ||
(dup2(slave, 2) < 0)){
printk("start_debugger : dup2 failed, errno = %d\n",
errno);
exit(1);
}
if(ioctl(0, TIOCSCTTY, 0) < 0){
printk("start_debugger : TIOCSCTTY failed, "
"errno = %d\n", errno);
exit(1);
}
if(tcsetpgrp (1, os_getpid()) < 0){
printk("start_debugger : tcsetpgrp failed, "
"errno = %d\n", errno);
#ifdef notdef
exit(1);
#endif
}
fd = make_tempfile("/tmp/gdb_init-XXXXXX", &tempname, 0);
if(fd < 0){
printk("start_debugger : make_tempfile failed,"
"err = %d\n", -fd);
exit(1);
}
os_write_file(fd, gdb_init_string,
sizeof(gdb_init_string) - 1);
if(startup){
if(stop){
os_write_file(fd, "b start_kernel\n",
strlen("b start_kernel\n"));
}
os_write_file(fd, "c\n", strlen("c\n"));
}
if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
printk("start_debugger : PTRACE_TRACEME failed, "
"errno = %d\n", errno);
exit(1);
}
execlp("gdb", "gdb", "--command", tempname, prog, NULL);
printk("start_debugger : exec of gdb failed, errno = %d\n",
errno);
}
if(child < 0){
printk("start_debugger : fork for gdb failed, errno = %d\n",
errno);
return(-1);
}
*fd_out = slave;
return(child);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

61
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@ -1,61 +0,0 @@
/**********************************************************************
ptproxy.h
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
**********************************************************************/
#ifndef __PTPROXY_H
#define __PTPROXY_H
#include <sys/types.h>
typedef struct debugger debugger_state;
typedef struct debugee debugee_state;
struct debugger
{
pid_t pid;
int wait_options;
int *wait_status_ptr;
unsigned int waiting : 1;
unsigned int real_wait : 1;
unsigned int expecting_child : 1;
int (*handle_trace) (debugger_state *, pid_t);
debugee_state *debugee;
};
struct debugee
{
pid_t pid;
int wait_status;
unsigned int died : 1;
unsigned int event : 1;
unsigned int stopped : 1;
unsigned int trace_singlestep : 1;
unsigned int trace_syscall : 1;
unsigned int traced : 1;
unsigned int zombie : 1;
unsigned int in_context : 1;
};
extern int debugger_syscall(debugger_state *debugger, pid_t pid);
extern int debugger_normal_return (debugger_state *debugger, pid_t unused);
extern long proxy_ptrace (struct debugger *, int, pid_t, long, long, pid_t,
int *strace_out);
extern void debugger_cancelled_return(debugger_state *debugger, int result);
#endif
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

237
arch/um/kernel/tt/ptproxy/ptrace.c
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@ -1,237 +0,0 @@
/**********************************************************************
ptrace.c
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
Jeff Dike (jdike@karaya.com) : Modified for integration into uml
**********************************************************************/
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include "ptproxy.h"
#include "debug.h"
#include "kern_util.h"
#include "ptrace_user.h"
#include "tt.h"
#include "os.h"
long proxy_ptrace(struct debugger *debugger, int arg1, pid_t arg2,
long arg3, long arg4, pid_t child, int *ret)
{
sigset_t relay;
long result;
int status;
*ret = 0;
if(debugger->debugee->died) return(-ESRCH);
switch(arg1){
case PTRACE_ATTACH:
if(debugger->debugee->traced) return(-EPERM);
debugger->debugee->pid = arg2;
debugger->debugee->traced = 1;
if(is_valid_pid(arg2) && (arg2 != child)){
debugger->debugee->in_context = 0;
kill(arg2, SIGSTOP);
debugger->debugee->event = 1;
debugger->debugee->wait_status = W_STOPCODE(SIGSTOP);
}
else {
debugger->debugee->in_context = 1;
if(debugger->debugee->stopped)
child_proxy(child, W_STOPCODE(SIGSTOP));
else kill(child, SIGSTOP);
}
return(0);
case PTRACE_DETACH:
if(!debugger->debugee->traced) return(-EPERM);
debugger->debugee->traced = 0;
debugger->debugee->pid = 0;
if(!debugger->debugee->in_context)
kill(child, SIGCONT);
return(0);
case PTRACE_CONT:
if(!debugger->debugee->in_context) return(-EPERM);
*ret = PTRACE_CONT;
return(ptrace(PTRACE_CONT, child, arg3, arg4));
#ifdef UM_HAVE_GETFPREGS
case PTRACE_GETFPREGS:
{
long regs[FP_FRAME_SIZE];
int i, result;
result = ptrace(PTRACE_GETFPREGS, child, 0, regs);
if(result == -1) return(-errno);
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
regs[i]);
return(result);
}
#endif
#ifdef UM_HAVE_GETFPXREGS
case PTRACE_GETFPXREGS:
{
long regs[FPX_FRAME_SIZE];
int i, result;
result = ptrace(PTRACE_GETFPXREGS, child, 0, regs);
if(result == -1) return(-errno);
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
regs[i]);
return(result);
}
#endif
#ifdef UM_HAVE_GETREGS
case PTRACE_GETREGS:
{
long regs[FRAME_SIZE];
int i, result;
result = ptrace(PTRACE_GETREGS, child, 0, regs);
if(result == -1) return(-errno);
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
ptrace (PTRACE_POKEDATA, debugger->pid,
arg4 + 4 * i, regs[i]);
return(result);
}
break;
#endif
case PTRACE_KILL:
result = ptrace(PTRACE_KILL, child, arg3, arg4);
if(result == -1) return(-errno);
return(result);
case PTRACE_PEEKDATA:
case PTRACE_PEEKTEXT:
case PTRACE_PEEKUSR:
/* The value being read out could be -1, so we have to
* check errno to see if there's an error, and zero it
* beforehand so we're not faked out by an old error
*/
errno = 0;
result = ptrace(arg1, child, arg3, 0);
if((result == -1) && (errno != 0)) return(-errno);
result = ptrace(PTRACE_POKEDATA, debugger->pid, arg4, result);
if(result == -1) return(-errno);
return(result);
case PTRACE_POKEDATA:
case PTRACE_POKETEXT:
case PTRACE_POKEUSR:
result = ptrace(arg1, child, arg3, arg4);
if(result == -1) return(-errno);
if(arg1 == PTRACE_POKEUSR) ptrace_pokeuser(arg3, arg4);
return(result);
#ifdef UM_HAVE_SETFPREGS
case PTRACE_SETFPREGS:
{
long regs[FP_FRAME_SIZE];
int i;
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
arg4 + 4 * i, 0);
result = ptrace(PTRACE_SETFPREGS, child, 0, regs);
if(result == -1) return(-errno);
return(result);
}
#endif
#ifdef UM_HAVE_SETFPXREGS
case PTRACE_SETFPXREGS:
{
long regs[FPX_FRAME_SIZE];
int i;
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
arg4 + 4 * i, 0);
result = ptrace(PTRACE_SETFPXREGS, child, 0, regs);
if(result == -1) return(-errno);
return(result);
}
#endif
#ifdef UM_HAVE_SETREGS
case PTRACE_SETREGS:
{
long regs[FRAME_SIZE];
int i;
for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
regs[i] = ptrace(PTRACE_PEEKDATA, debugger->pid,
arg4 + 4 * i, 0);
result = ptrace(PTRACE_SETREGS, child, 0, regs);
if(result == -1) return(-errno);
return(result);
}
#endif
case PTRACE_SINGLESTEP:
if(!debugger->debugee->in_context) return(-EPERM);
sigemptyset(&relay);
sigaddset(&relay, SIGSEGV);
sigaddset(&relay, SIGILL);
sigaddset(&relay, SIGBUS);
result = ptrace(PTRACE_SINGLESTEP, child, arg3, arg4);
if(result == -1) return(-errno);
status = wait_for_stop(child, SIGTRAP, PTRACE_SINGLESTEP,
&relay);
child_proxy(child, status);
return(result);
case PTRACE_SYSCALL:
if(!debugger->debugee->in_context) return(-EPERM);
result = ptrace(PTRACE_SYSCALL, child, arg3, arg4);
if(result == -1) return(-errno);
*ret = PTRACE_SYSCALL;
return(result);
case PTRACE_TRACEME:
default:
return(-EINVAL);
}
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

70
arch/um/kernel/tt/ptproxy/sysdep.c
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@ -1,70 +0,0 @@
/**********************************************************************
sysdep.c
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
**********************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <linux/unistd.h>
#include "ptrace_user.h"
#include "user.h"
#include "os.h"
int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3, long *arg4,
long *arg5)
{
*arg1 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG1_OFFSET, 0);
*arg2 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG2_OFFSET, 0);
*arg3 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG3_OFFSET, 0);
*arg4 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG4_OFFSET, 0);
*arg5 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG5_OFFSET, 0);
return(ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, 0));
}
void syscall_cancel(pid_t pid, int result)
{
if((ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
__NR_getpid) < 0) ||
(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) ||
(wait_for_stop(pid, SIGTRAP, PTRACE_SYSCALL, NULL) < 0) ||
(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result) < 0) ||
(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0))
printk("ptproxy: couldn't cancel syscall: errno = %d\n",
errno);
}
void syscall_set_result(pid_t pid, long result)
{
ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result);
}
void syscall_continue(pid_t pid)
{
ptrace(PTRACE_SYSCALL, pid, 0, 0);
}
int syscall_pause(pid_t pid)
{
if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_pause) < 0){
printk("syscall_change - ptrace failed, errno = %d\n", errno);
return(-1);
}
return(0);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

25
arch/um/kernel/tt/ptproxy/sysdep.h
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@ -1,25 +0,0 @@
/**********************************************************************
sysdep.h
Copyright (C) 1999 Lars Brinkhoff.
Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
See the file COPYING for licensing terms and conditions.
**********************************************************************/
extern int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3,
long *arg4, long *arg5);
extern void syscall_cancel (pid_t pid, long result);
extern void syscall_set_result (pid_t pid, long result);
extern void syscall_continue (pid_t pid);
extern int syscall_pause(pid_t pid);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

85
arch/um/kernel/tt/ptproxy/wait.c
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@ -1,85 +0,0 @@
/**********************************************************************
wait.c
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
**********************************************************************/
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include "ptproxy.h"
#include "sysdep.h"
#include "wait.h"
#include "ptrace_user.h"
#include "sysdep/ptrace.h"
#include "sysdep/sigcontext.h"
int proxy_wait_return(struct debugger *debugger, pid_t unused)
{
debugger->waiting = 0;
if(debugger->debugee->died || (debugger->wait_options & __WCLONE)){
debugger_cancelled_return(debugger, -ECHILD);
return(0);
}
if(debugger->debugee->zombie && debugger->debugee->event)
debugger->debugee->died = 1;
if(debugger->debugee->event){
debugger->debugee->event = 0;
ptrace(PTRACE_POKEDATA, debugger->pid,
debugger->wait_status_ptr,
debugger->debugee->wait_status);
/* if (wait4)
ptrace (PTRACE_POKEDATA, pid, rusage_ptr, ...); */
debugger_cancelled_return(debugger, debugger->debugee->pid);
return(0);
}
/* pause will return -EINTR, which happens to be right for wait */
debugger_normal_return(debugger, -1);
return(0);
}
int parent_wait_return(struct debugger *debugger, pid_t unused)
{
return(debugger_normal_return(debugger, -1));
}
int real_wait_return(struct debugger *debugger)
{
unsigned long ip;
int pid;
pid = debugger->pid;
ip = ptrace(PTRACE_PEEKUSR, pid, PT_IP_OFFSET, 0);
IP_RESTART_SYSCALL(ip);
if(ptrace(PTRACE_POKEUSR, pid, PT_IP_OFFSET, ip) < 0)
tracer_panic("real_wait_return : Failed to restart system "
"call, errno = %d\n", errno);
if((ptrace(PTRACE_SYSCALL, debugger->pid, 0, SIGCHLD) < 0) ||
(ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
(ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
debugger_normal_return(debugger, -1))
tracer_panic("real_wait_return : gdb failed to wait, "
"errno = %d\n", errno);
return(0);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

15
arch/um/kernel/tt/ptproxy/wait.h
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@ -1,15 +0,0 @@
/**********************************************************************
wait.h
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
**********************************************************************/
#ifndef __PTPROXY_WAIT_H
#define __PTPROXY_WAIT_H
extern int proxy_wait_return(struct debugger *debugger, pid_t unused);
extern int real_wait_return(struct debugger *debugger);
extern int parent_wait_return(struct debugger *debugger, pid_t unused);
#endif

46
arch/um/kernel/tt/syscall_kern.c
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@ -1,46 +0,0 @@
/*
* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#include "linux/types.h"
#include "linux/utime.h"
#include "linux/sys.h"
#include "linux/ptrace.h"
#include "asm/unistd.h"
#include "asm/ptrace.h"
#include "asm/uaccess.h"
#include "asm/stat.h"
#include "sysdep/syscalls.h"
#include "sysdep/sigcontext.h"
#include "kern_util.h"
#include "syscall.h"
void syscall_handler_tt(int sig, struct pt_regs *regs)
{
void *sc;
long result;
int syscall;
sc = UPT_SC(&regs->regs);
SC_START_SYSCALL(sc);
syscall = UPT_SYSCALL_NR(&regs->regs);
syscall_trace(&regs->regs, 0);
current->thread.nsyscalls++;
nsyscalls++;
if((syscall >= NR_syscalls) || (syscall < 0))
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);
/* regs->sc may have changed while the system call ran (there may
* have been an interrupt or segfault), so it needs to be refreshed.
*/
UPT_SC(&regs->regs) = sc;
SC_SET_SYSCALL_RETURN(sc, result);
syscall_trace(&regs->regs, 1);
}

60
arch/um/kernel/tt/syscall_user.c
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@ -1,60 +0,0 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <asm/unistd.h>
#include "sysdep/ptrace.h"
#include "sigcontext.h"
#include "ptrace_user.h"
#include "task.h"
#include "kern_util.h"
#include "syscall.h"
#include "tt.h"
void do_sigtrap(void *task)
{
UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
}
void do_syscall(void *task, int pid, int local_using_sysemu)
{
unsigned long proc_regs[FRAME_SIZE];
if(ptrace_getregs(pid, proc_regs) < 0)
tracer_panic("Couldn't read registers");
UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
#ifdef UPT_ORIGGPR2
UPT_ORIGGPR2(TASK_REGS(task)) = REGS_ORIGGPR2(proc_regs);
#endif
if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
((unsigned long *) PT_IP(proc_regs) <= &_etext))
tracer_panic("I'm tracing myself and I can't get out");
/* advanced sysemu mode set syscall number to -1 automatically */
if (local_using_sysemu==2)
return;
/* syscall number -1 in sysemu skips syscall restarting in host */
if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
local_using_sysemu ? -1 : __NR_getpid) < 0)
tracer_panic("do_syscall : Nullifying syscall failed, "
"errno = %d", errno);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

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arch/um/kernel/tt/tlb.c
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@ -1,120 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Copyright 2003 PathScale, Inc.
* Licensed under the GPL
*/
#include "linux/stddef.h"
#include "linux/kernel.h"
#include "linux/sched.h"
#include "linux/mm.h"
#include "asm/page.h"
#include "asm/pgtable.h"
#include "asm/uaccess.h"
#include "asm/tlbflush.h"
#include "mem_user.h"
#include "os.h"
#include "tlb.h"
static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
int finished, void **flush)
{
struct host_vm_op *op;
int i, ret=0;
for(i = 0; i <= last && !ret; i++){
op = &ops[i];
switch(op->type){
case MMAP:
ret = os_map_memory((void *) op->u.mmap.addr,
op->u.mmap.fd, op->u.mmap.offset,
op->u.mmap.len, op->u.mmap.r,
op->u.mmap.w, op->u.mmap.x);
break;
case MUNMAP:
ret = os_unmap_memory((void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
ret = protect_memory(op->u.mprotect.addr,
op->u.munmap.len,
op->u.mprotect.r,
op->u.mprotect.w,
op->u.mprotect.x, 1);
protect_memory(op->u.mprotect.addr, op->u.munmap.len,
op->u.mprotect.r, op->u.mprotect.w,
op->u.mprotect.x, 1);
break;
default:
printk("Unknown op type %d in do_ops\n", op->type);
break;
}
}
return ret;
}
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
if((current->thread.mode.tt.extern_pid != -1) &&
(current->thread.mode.tt.extern_pid != os_getpid()))
panic("fix_range fixing wrong address space, current = 0x%p",
current);
fix_range_common(mm, start_addr, end_addr, force, do_ops);
}
atomic_t vmchange_seq = ATOMIC_INIT(1);
void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
{
if(flush_tlb_kernel_range_common(start, end))
atomic_inc(&vmchange_seq);
}
void flush_tlb_kernel_vm_tt(void)
{
flush_tlb_kernel_range(start_vm, end_vm);
}
void __flush_tlb_one_tt(unsigned long addr)
{
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
}
void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
if(vma->vm_mm != current->mm) return;
/* Assumes that the range start ... end is entirely within
* either process memory or kernel vm
*/
if((start >= start_vm) && (start < end_vm)){
if(flush_tlb_kernel_range_common(start, end))
atomic_inc(&vmchange_seq);
}
else fix_range(vma->vm_mm, start, end, 0);
}
void flush_tlb_mm_tt(struct mm_struct *mm)
{
unsigned long seq;
if(mm != current->mm) return;
fix_range(mm, 0, STACK_TOP, 0);
seq = atomic_read(&vmchange_seq);
if(current->thread.mode.tt.vm_seq == seq)
return;
current->thread.mode.tt.vm_seq = seq;
flush_tlb_kernel_range_common(start_vm, end_vm);
}
void force_flush_all_tt(void)
{
fix_range(current->mm, 0, STACK_TOP, 1);
flush_tlb_kernel_range_common(start_vm, end_vm);
}

461
arch/um/kernel/tt/tracer.c
View File

@ -1,461 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sched.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/wait.h>
#include "user.h"
#include "sysdep/ptrace.h"
#include "sigcontext.h"
#include "sysdep/sigcontext.h"
#include "os.h"
#include "mem_user.h"
#include "process.h"
#include "kern_util.h"
#include "chan_user.h"
#include "ptrace_user.h"
#include "irq_user.h"
#include "mode.h"
#include "tt.h"
static int tracer_winch[2];
int is_tracer_winch(int pid, int fd, void *data)
{
if(pid != os_getpgrp())
return(0);
register_winch_irq(tracer_winch[0], fd, -1, data);
return(1);
}
static void tracer_winch_handler(int sig)
{
int n;
char c = 1;
n = os_write_file(tracer_winch[1], &c, sizeof(c));
if(n != sizeof(c))
printk("tracer_winch_handler - write failed, err = %d\n", -n);
}
/* Called only by the tracing thread during initialization */
static void setup_tracer_winch(void)
{
int err;
err = os_pipe(tracer_winch, 1, 1);
if(err < 0){
printk("setup_tracer_winch : os_pipe failed, err = %d\n", -err);
return;
}
signal(SIGWINCH, tracer_winch_handler);
}
void attach_process(int pid)
{
if((ptrace(PTRACE_ATTACH, pid, 0, 0) < 0) ||
(ptrace(PTRACE_CONT, pid, 0, 0) < 0))
tracer_panic("OP_FORK failed to attach pid");
wait_for_stop(pid, SIGSTOP, PTRACE_CONT, NULL);
if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
tracer_panic("OP_FORK: PTRACE_SETOPTIONS failed, errno = %d", errno);
if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
tracer_panic("OP_FORK failed to continue process");
}
void tracer_panic(char *format, ...)
{
va_list ap;
va_start(ap, format);
vprintf(format, ap);
va_end(ap);
printf("\n");
while(1) pause();
}
static void tracer_segv(int sig, struct sigcontext sc)
{
struct faultinfo fi;
GET_FAULTINFO_FROM_SC(fi, &sc);
printf("Tracing thread segfault at address 0x%lx, ip 0x%lx\n",
FAULT_ADDRESS(fi), SC_IP(&sc));
while(1)
pause();
}
/* Changed early in boot, and then only read */
int debug = 0;
int debug_stop = 1;
int debug_parent = 0;
int honeypot = 0;
static int signal_tramp(void *arg)
{
int (*proc)(void *);
if(honeypot && munmap((void *) (host_task_size - 0x10000000),
0x10000000))
panic("Unmapping stack failed");
if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0)
panic("ptrace PTRACE_TRACEME failed");
os_stop_process(os_getpid());
change_sig(SIGWINCH, 0);
signal(SIGUSR1, SIG_IGN);
change_sig(SIGCHLD, 0);
signal(SIGSEGV, (__sighandler_t) sig_handler);
set_cmdline("(idle thread)");
set_init_pid(os_getpid());
init_irq_signals(0);
proc = arg;
return((*proc)(NULL));
}
static void sleeping_process_signal(int pid, int sig)
{
switch(sig){
/* These two result from UML being ^Z-ed and bg-ed. PTRACE_CONT is
* right because the process must be in the kernel already.
*/
case SIGCONT:
case SIGTSTP:
if(ptrace(PTRACE_CONT, pid, 0, sig) < 0)
tracer_panic("sleeping_process_signal : Failed to "
"continue pid %d, signal = %d, "
"errno = %d\n", pid, sig, errno);
break;
/* This happens when the debugger (e.g. strace) is doing system call
* tracing on the kernel. During a context switch, the current task
* will be set to the incoming process and the outgoing process will
* hop into write and then read. Since it's not the current process
* any more, the trace of those will land here. So, we need to just
* PTRACE_SYSCALL it.
*/
case (SIGTRAP + 0x80):
if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
tracer_panic("sleeping_process_signal : Failed to "
"PTRACE_SYSCALL pid %d, errno = %d\n",
pid, errno);
break;
case SIGSTOP:
break;
default:
tracer_panic("sleeping process %d got unexpected "
"signal : %d\n", pid, sig);
break;
}
}
/* Accessed only by the tracing thread */
int debugger_pid = -1;
int debugger_parent = -1;
int debugger_fd = -1;
int gdb_pid = -1;
struct {
int pid;
int signal;
unsigned long addr;
struct timeval time;
} signal_record[1024][32];
int signal_index[32];
int nsignals = 0;
int debug_trace = 0;
extern void signal_usr1(int sig);
int tracing_pid = -1;
int tracer(int (*init_proc)(void *), void *sp)
{
void *task = NULL;
int status, pid = 0, sig = 0, cont_type, tracing = 0, op = 0;
int proc_id = 0, n, err, old_tracing = 0, strace = 0;
int local_using_sysemu = 0;
signal(SIGPIPE, SIG_IGN);
setup_tracer_winch();
tracing_pid = os_getpid();
printf("tracing thread pid = %d\n", tracing_pid);
pid = clone(signal_tramp, sp, CLONE_FILES | SIGCHLD, init_proc);
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0){
printf("waitpid on idle thread failed, errno = %d\n", errno);
exit(1);
}
if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0) {
printf("Failed to PTRACE_SETOPTIONS for idle thread, errno = %d\n", errno);
exit(1);
}
if((ptrace(PTRACE_CONT, pid, 0, 0) < 0)){
printf("Failed to continue idle thread, errno = %d\n", errno);
exit(1);
}
signal(SIGSEGV, (sighandler_t) tracer_segv);
signal(SIGUSR1, signal_usr1);
if(debug_trace){
printf("Tracing thread pausing to be attached\n");
stop();
}
if(debug){
if(gdb_pid != -1)
debugger_pid = attach_debugger(pid, gdb_pid, 1);
else debugger_pid = init_ptrace_proxy(pid, 1, debug_stop);
if(debug_parent){
debugger_parent = os_process_parent(debugger_pid);
init_parent_proxy(debugger_parent);
err = attach(debugger_parent);
if(err){
printf("Failed to attach debugger parent %d, "
"errno = %d\n", debugger_parent, -err);
debugger_parent = -1;
}
else {
if(ptrace(PTRACE_SYSCALL, debugger_parent,
0, 0) < 0){
printf("Failed to continue debugger "
"parent, errno = %d\n", errno);
debugger_parent = -1;
}
}
}
}
set_cmdline("(tracing thread)");
while(1){
CATCH_EINTR(pid = waitpid(-1, &status, WUNTRACED));
if(pid <= 0){
if(errno != ECHILD){
printf("wait failed - errno = %d\n", errno);
}
continue;
}
if(pid == debugger_pid){
int cont = 0;
if(WIFEXITED(status) || WIFSIGNALED(status))
debugger_pid = -1;
/* XXX Figure out how to deal with gdb and SMP */
else cont = debugger_signal(status, cpu_tasks[0].pid);
if(cont == PTRACE_SYSCALL) strace = 1;
continue;
}
else if(pid == debugger_parent){
debugger_parent_signal(status, pid);
continue;
}
nsignals++;
if(WIFEXITED(status)) ;
#ifdef notdef
{
printf("Child %d exited with status %d\n", pid,
WEXITSTATUS(status));
}
#endif
else if(WIFSIGNALED(status)){
sig = WTERMSIG(status);
if(sig != 9){
printf("Child %d exited with signal %d\n", pid,
sig);
}
}
else if(WIFSTOPPED(status)){
proc_id = pid_to_processor_id(pid);
sig = WSTOPSIG(status);
if(proc_id == -1){
sleeping_process_signal(pid, sig);
continue;
}
task = cpu_tasks[proc_id].task;
tracing = is_tracing(task);
old_tracing = tracing;
/* Assume: no syscall, when coming from user */
if ( tracing )
do_sigtrap(task);
switch(sig){
case SIGUSR1:
sig = 0;
op = do_proc_op(task, proc_id);
switch(op){
/*
* This is called when entering user mode; after
* this, we start intercepting syscalls.
*
* In fact, a process is started in kernel mode,
* so with is_tracing() == 0 (and that is reset
* when executing syscalls, since UML kernel has
* the right to do syscalls);
*/
case OP_TRACE_ON:
arch_leave_kernel(task, pid);
tracing = 1;
break;
case OP_REBOOT:
case OP_HALT:
unmap_physmem();
kmalloc_ok = 0;
os_kill_ptraced_process(pid, 0);
/* Now let's reap remaining zombies */
errno = 0;
do {
waitpid(-1, &status,
WUNTRACED);
} while (errno != ECHILD);
return(op == OP_REBOOT);
case OP_NONE:
printf("Detaching pid %d\n", pid);
detach(pid, SIGSTOP);
continue;
default:
break;
}
/* OP_EXEC switches host processes on us,
* we want to continue the new one.
*/
pid = cpu_tasks[proc_id].pid;
break;
case (SIGTRAP + 0x80):
if(!tracing && (debugger_pid != -1)){
child_signal(pid, status & 0x7fff);
continue;
}
tracing = 0;
/* local_using_sysemu has been already set
* below, since if we are here, is_tracing() on
* the traced task was 1, i.e. the process had
* already run through one iteration of the
* loop which executed a OP_TRACE_ON request.*/
do_syscall(task, pid, local_using_sysemu);
sig = SIGUSR2;
break;
case SIGTRAP:
if(!tracing && (debugger_pid != -1)){
child_signal(pid, status);
continue;
}
tracing = 0;
break;
case SIGPROF:
if(tracing) sig = 0;
break;
case SIGCHLD:
case SIGHUP:
sig = 0;
break;
case SIGSEGV:
case SIGIO:
case SIGALRM:
case SIGVTALRM:
case SIGFPE:
case SIGBUS:
case SIGILL:
case SIGWINCH:
default:
tracing = 0;
break;
}
set_tracing(task, tracing);
if(!tracing && old_tracing)
arch_enter_kernel(task, pid);
if(!tracing && (debugger_pid != -1) && (sig != 0) &&
(sig != SIGALRM) && (sig != SIGVTALRM) &&
(sig != SIGSEGV) && (sig != SIGTRAP) &&
(sig != SIGUSR2) && (sig != SIGIO) &&
(sig != SIGFPE)){
child_signal(pid, status);
continue;
}
local_using_sysemu = get_using_sysemu();
if(tracing)
cont_type = SELECT_PTRACE_OPERATION(local_using_sysemu,
singlestepping(task));
else if((debugger_pid != -1) && strace)
cont_type = PTRACE_SYSCALL;
else
cont_type = PTRACE_CONT;
if(ptrace(cont_type, pid, 0, sig) != 0){
tracer_panic("ptrace failed to continue "
"process - errno = %d\n",
errno);
}
}
}
return(0);
}
static int __init uml_debug_setup(char *line, int *add)
{
char *next;
debug = 1;
*add = 0;
if(*line != '=') return(0);
line++;
while(line != NULL){
next = strchr(line, ',');
if(next) *next++ = '\0';
if(!strcmp(line, "go")) debug_stop = 0;
else if(!strcmp(line, "parent")) debug_parent = 1;
else printf("Unknown debug option : '%s'\n", line);
line = next;
}
return(0);
}
__uml_setup("debug", uml_debug_setup,
"debug\n"
" Starts up the kernel under the control of gdb. See the \n"
" kernel debugging tutorial and the debugging session pages\n"
" at http://user-mode-linux.sourceforge.net/ for more information.\n\n"
);
static int __init uml_debugtrace_setup(char *line, int *add)
{
debug_trace = 1;
return 0;
}
__uml_setup("debugtrace", uml_debugtrace_setup,
"debugtrace\n"
" Causes the tracing thread to pause until it is attached by a\n"
" debugger and continued. This is mostly for debugging crashes\n"
" early during boot, and should be pretty much obsoleted by\n"
" the debug switch.\n\n"
);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

70
arch/um/kernel/tt/trap_user.c
View File

@ -1,70 +0,0 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include "sysdep/ptrace.h"
#include "sysdep/sigcontext.h"
#include "kern_util.h"
#include "task.h"
#include "tt.h"
#include "os.h"
void sig_handler_common_tt(int sig, void *sc_ptr)
{
struct sigcontext *sc = sc_ptr;
struct tt_regs save_regs, *r;
int save_errno = errno, is_user = 0;
void (*handler)(int, union uml_pt_regs *);
/* This is done because to allow SIGSEGV to be delivered inside a SEGV
* handler. This can happen in copy_user, and if SEGV is disabled,
* the process will die.
*/
if(sig == SIGSEGV)
change_sig(SIGSEGV, 1);
r = &TASK_REGS(get_current())->tt;
if ( sig == SIGFPE || sig == SIGSEGV ||
sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP ) {
GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
}
save_regs = *r;
if (sc)
is_user = user_context(SC_SP(sc));
r->sc = sc;
if(sig != SIGUSR2)
r->syscall = -1;
handler = sig_info[sig];
/* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
if (sig != SIGIO && sig != SIGWINCH &&
sig != SIGVTALRM && sig != SIGALRM)
unblock_signals();
handler(sig, (union uml_pt_regs *) r);
if(is_user){
interrupt_end();
block_signals();
set_user_mode(NULL);
}
*r = save_regs;
errno = save_errno;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

73
arch/um/kernel/tt/uaccess.c
View File

@ -1,73 +0,0 @@
/*
* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#include "linux/sched.h"
#include "asm/uaccess.h"
int copy_from_user_tt(void *to, const void __user *from, int n)
{
if(!access_ok(VERIFY_READ, from, n))
return(n);
return(__do_copy_from_user(to, from, n, &current->thread.fault_addr,
&current->thread.fault_catcher));
}
int copy_to_user_tt(void __user *to, const void *from, int n)
{
if(!access_ok(VERIFY_WRITE, to, n))
return(n);
return(__do_copy_to_user(to, from, n, &current->thread.fault_addr,
&current->thread.fault_catcher));
}
int strncpy_from_user_tt(char *dst, const char __user *src, int count)
{
int n;
if(!access_ok(VERIFY_READ, src, 1))
return(-EFAULT);
n = __do_strncpy_from_user(dst, src, count,
&current->thread.fault_addr,
&current->thread.fault_catcher);
if(n < 0) return(-EFAULT);
return(n);
}
int __clear_user_tt(void __user *mem, int len)
{
return(__do_clear_user(mem, len,
&current->thread.fault_addr,
&current->thread.fault_catcher));
}
int clear_user_tt(void __user *mem, int len)
{
if(!access_ok(VERIFY_WRITE, mem, len))
return(len);
return(__do_clear_user(mem, len, &current->thread.fault_addr,
&current->thread.fault_catcher));
}
int strnlen_user_tt(const void __user *str, int len)
{
return(__do_strnlen_user(str, len,
&current->thread.fault_addr,
&current->thread.fault_catcher));
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

105
arch/um/kernel/tt/uaccess_user.c
View File

@ -1,105 +0,0 @@
/*
* Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
* Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <string.h>
#include "uml_uaccess.h"
#include "task.h"
#include "kern_util.h"
#include "os.h"
#include "longjmp.h"
int __do_copy_from_user(void *to, const void *from, int n,
void **fault_addr, void **fault_catcher)
{
struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
__do_copy, &faulted);
TASK_REGS(get_current())->tt = save;
if(!faulted)
return 0;
else if (fault)
return n - (fault - (unsigned long) from);
else
/* In case of a general protection fault, we don't have the
* fault address, so NULL is used instead. Pretend we didn't
* copy anything. */
return n;
}
static void __do_strncpy(void *dst, const void *src, int count)
{
strncpy(dst, src, count);
}
int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
void **fault_addr, void **fault_catcher)
{
struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
__do_strncpy, &faulted);
TASK_REGS(get_current())->tt = save;
if(!faulted) return(strlen(dst));
else return(-1);
}
static void __do_clear(void *to, const void *from, int n)
{
memset(to, 0, n);
}
int __do_clear_user(void *mem, unsigned long len,
void **fault_addr, void **fault_catcher)
{
struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
__do_clear, &faulted);
TASK_REGS(get_current())->tt = save;
if(!faulted) return(0);
else return(len - (fault - (unsigned long) mem));
}
int __do_strnlen_user(const char *str, unsigned long n,
void **fault_addr, void **fault_catcher)
{
struct tt_regs save = TASK_REGS(get_current())->tt;
int ret;
unsigned long *faddrp = (unsigned long *)fault_addr;
jmp_buf jbuf;
*fault_catcher = &jbuf;
if(UML_SETJMP(&jbuf) == 0)
ret = strlen(str) + 1;
else ret = *faddrp - (unsigned long) str;
*fault_addr = NULL;
*fault_catcher = NULL;
TASK_REGS(get_current())->tt = save;
return ret;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

113
arch/um/kernel/um_arch.c
View File

@ -38,9 +38,7 @@
#include "choose-mode.h"
#include "mode_kern.h"
#include "mode.h"
#ifdef UML_CONFIG_MODE_SKAS
#include "skas.h"
#endif
#define DEFAULT_COMMAND_LINE "root=98:0"
@ -132,43 +130,12 @@ unsigned long end_vm;
/* Set in uml_ncpus_setup */
int ncpus = 1;
#ifdef CONFIG_CMDLINE_ON_HOST
/* Pointer set in linux_main, the array itself is private to each thread,
* and changed at address space creation time so this poses no concurrency
* problems.
*/
static char *argv1_begin = NULL;
static char *argv1_end = NULL;
#endif
/* Set in early boot */
static int have_root __initdata = 0;
/* Set in uml_mem_setup and modified in linux_main */
long long physmem_size = 32 * 1024 * 1024;
void set_cmdline(char *cmd)
{
#ifdef CONFIG_CMDLINE_ON_HOST
char *umid, *ptr;
if(CHOOSE_MODE(honeypot, 0)) return;
umid = get_umid();
if(*umid != '\0'){
snprintf(argv1_begin,
(argv1_end - argv1_begin) * sizeof(*ptr),
"(%s) ", umid);
ptr = &argv1_begin[strlen(argv1_begin)];
}
else ptr = argv1_begin;
snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
memset(argv1_begin + strlen(argv1_begin), '\0',
argv1_end - argv1_begin - strlen(argv1_begin));
#endif
}
static char *usage_string =
"User Mode Linux v%s\n"
" available at http://user-mode-linux.sourceforge.net/\n\n";
@ -201,13 +168,10 @@ __uml_setup("root=", uml_root_setup,
" root=/dev/ubd5\n\n"
);
#ifndef CONFIG_MODE_TT
static int __init no_skas_debug_setup(char *line, int *add)
{
printf("'debug' is not necessary to gdb UML in skas mode - run \n");
printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
printf("doesn't work as expected\n");
printf("'gdb linux'");
return 0;
}
@ -217,8 +181,6 @@ __uml_setup("debug", no_skas_debug_setup,
" this flag is not needed to run gdb on UML in skas mode\n\n"
);
#endif
#ifdef CONFIG_SMP
static int __init uml_ncpus_setup(char *line, int *add)
{
@ -236,52 +198,6 @@ __uml_setup("ncpus=", uml_ncpus_setup,
);
#endif
static int force_tt = 0;
#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
#define DEFAULT_TT 0
static int __init mode_tt_setup(char *line, int *add)
{
force_tt = 1;
return 0;
}
#else
#ifdef CONFIG_MODE_SKAS
#define DEFAULT_TT 0
static int __init mode_tt_setup(char *line, int *add)
{
printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
return 0;
}
#else
#ifdef CONFIG_MODE_TT
#define DEFAULT_TT 1
static int __init mode_tt_setup(char *line, int *add)
{
printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
return 0;
}
#endif
#endif
#endif
__uml_setup("mode=tt", mode_tt_setup,
"mode=tt\n"
" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
" forces UML to run in tt (tracing thread) mode. It is not the default\n"
" because it's slower and less secure than skas mode.\n\n"
);
int mode_tt = DEFAULT_TT;
static int __init Usage(char *line, int *add)
{
const char **p;
@ -357,29 +273,13 @@ int __init linux_main(int argc, char **argv)
add_arg(DEFAULT_COMMAND_LINE);
os_early_checks();
if (force_tt)
clear_can_do_skas();
mode_tt = force_tt ? 1 : !can_do_skas();
#ifndef CONFIG_MODE_TT
if (mode_tt) {
/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
* can_do_skas() returned 0, and the message is correct. */
printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
exit(1);
}
#endif
#ifndef CONFIG_MODE_SKAS
mode = "TT";
#else
/* Show to the user the result of selection */
if (mode_tt)
mode = "TT";
else if (proc_mm && ptrace_faultinfo)
can_do_skas();
if (proc_mm && ptrace_faultinfo)
mode = "SKAS3";
else
mode = "SKAS0";
#endif
printf("UML running in %s mode\n", mode);
@ -411,11 +311,6 @@ int __init linux_main(int argc, char **argv)
setup_machinename(init_utsname()->machine);
#ifdef CONFIG_CMDLINE_ON_HOST
argv1_begin = argv[1];
argv1_end = &argv[1][strlen(argv[1])];
#endif
highmem = 0;
iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;

7
arch/um/kernel/uml.lds.S
View File

@ -18,13 +18,6 @@ SECTIONS
. = START + SIZEOF_HEADERS;
#ifdef MODE_TT
.remap_data : { UNMAP_PATH (.data .bss) }
.remap : { UNMAP_PATH (.text) }
. = ALIGN(4096); /* Init code and data */
#endif
_text = .;
_stext = .;
__init_begin = .;

7
arch/um/os-Linux/Makefile
View File

@ -5,12 +5,7 @@
obj-y = aio.o elf_aux.o execvp.o file.o helper.o irq.o main.o mem.o process.o \
registers.o sigio.o signal.o start_up.o time.o trap.o tty.o uaccess.o \
umid.o tls.o user_syms.o util.o drivers/ sys-$(SUBARCH)/
obj-$(CONFIG_MODE_SKAS) += skas/
obj-$(CONFIG_MODE_TT) += tt.o
user-objs-$(CONFIG_MODE_TT) += tt.o
umid.o tls.o user_syms.o util.o drivers/ sys-$(SUBARCH)/ skas/
obj-$(CONFIG_TTY_LOG) += tty_log.o
user-objs-$(CONFIG_TTY_LOG) += tty_log.o

32
arch/um/os-Linux/main.c
View File

@ -25,9 +25,6 @@
#include "um_malloc.h"
#include "kern_constants.h"
/* Set in main, unchanged thereafter */
char *linux_prog;
#define PGD_BOUND (4 * 1024 * 1024)
#define STACKSIZE (8 * 1024 * 1024)
#define THREAD_NAME_LEN (256)
@ -125,35 +122,6 @@ int __init main(int argc, char **argv, char **envp)
char **new_argv;
int ret, i, err;
#ifdef UML_CONFIG_CMDLINE_ON_HOST
/* Allocate memory for thread command lines */
if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){
char padding[THREAD_NAME_LEN] = {
[ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0'
};
new_argv = malloc((argc + 2) * sizeof(char*));
if(!new_argv) {
perror("Allocating extended argv");
exit(1);
}
new_argv[0] = argv[0];
new_argv[1] = padding;
for(i = 2; i <= argc; i++)
new_argv[i] = argv[i - 1];
new_argv[argc + 1] = NULL;
execvp(new_argv[0], new_argv);
perror("execing with extended args");
exit(1);
}
#endif
linux_prog = argv[0];
set_stklim();
setup_env_path();

31
arch/um/os-Linux/process.c
View File

@ -133,13 +133,6 @@ void os_kill_ptraced_process(int pid, int reap_child)
CATCH_EINTR(waitpid(pid, NULL, 0));
}
#ifdef UML_CONFIG_MODE_TT
void os_usr1_process(int pid)
{
kill(pid, SIGUSR1);
}
#endif
/* Don't use the glibc version, which caches the result in TLS. It misses some
* syscalls, and also breaks with clone(), which does not unshare the TLS.
*/
@ -239,30 +232,6 @@ out:
return ok;
}
#ifdef UML_CONFIG_MODE_TT
void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
{
int flags = 0, pages;
if(sig_stack != NULL){
pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
set_sigstack(sig_stack, pages * UM_KERN_PAGE_SIZE);
flags = SA_ONSTACK;
}
if(usr1_handler){
struct sigaction sa;
sa.sa_handler = usr1_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = flags;
sa.sa_restorer = NULL;
if(sigaction(SIGUSR1, &sa, NULL) < 0)
panic("init_new_thread_stack - sigaction failed - "
"errno = %d\n", errno);
}
}
#endif
void init_new_thread_signals(void)
{
set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,

10
arch/um/os-Linux/start_up.c
View File

@ -35,12 +35,9 @@
#include "mode.h"
#include "tempfile.h"
#include "kern_constants.h"
#ifdef UML_CONFIG_MODE_SKAS
#include "skas.h"
#include "skas_ptrace.h"
#include "registers.h"
#endif
static int ptrace_child(void *arg)
{
@ -407,7 +404,6 @@ __uml_setup("noptraceldt", noptraceldt_cmd_param,
" To support PTRACE_LDT, the host needs to be patched using\n"
" the current skas3 patch.\n\n");
#ifdef UML_CONFIG_MODE_SKAS
static inline void check_skas3_ptrace_faultinfo(void)
{
struct ptrace_faultinfo fi;
@ -504,12 +500,6 @@ int can_do_skas(void)
return 1;
}
#else
int can_do_skas(void)
{
return 0;
}
#endif
int __init parse_iomem(char *str, int *add)
{

2
arch/um/os-Linux/sys-i386/Makefile
View File

@ -3,7 +3,7 @@
# Licensed under the GPL
#
obj-$(CONFIG_MODE_SKAS) = registers.o signal.o tls.o
obj-y = registers.o signal.o tls.o
USER_OBJS := $(obj-y)

2
arch/um/os-Linux/sys-x86_64/Makefile
View File

@ -3,7 +3,7 @@
# Licensed under the GPL
#
obj-$(CONFIG_MODE_SKAS) = registers.o prctl.o signal.o
obj-y = registers.o prctl.o signal.o
USER_OBJS := $(obj-y)

19
arch/um/os-Linux/time.c
View File

@ -30,13 +30,6 @@ int set_interval(int is_virtual)
return 0;
}
#ifdef UML_CONFIG_MODE_TT
void enable_timer(void)
{
set_interval(1);
}
#endif
void disable_timer(void)
{
struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
@ -71,18 +64,6 @@ void switch_timers(int to_real)
errno);
}
#ifdef UML_CONFIG_MODE_TT
void uml_idle_timer(void)
{
if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
panic("Couldn't unset SIGVTALRM handler");
set_handler(SIGALRM, (__sighandler_t) alarm_handler,
SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_interval(0);
}
#endif
unsigned long long os_nsecs(void)
{
struct timeval tv;

36
arch/um/os-Linux/tls.c
View File

@ -8,11 +8,6 @@
/* TLS support - we basically rely on the host's one.*/
/* In TT mode, this should be called only by the tracing thread, and makes sense
* only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
*
*/
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
@ -32,8 +27,6 @@ int os_set_thread_area(user_desc_t *info, int pid)
return ret;
}
#ifdef UML_CONFIG_MODE_SKAS
int os_get_thread_area(user_desc_t *info, int pid)
{
int ret;
@ -44,32 +37,3 @@ int os_get_thread_area(user_desc_t *info, int pid)
ret = -errno;
return ret;
}
#endif
#ifdef UML_CONFIG_MODE_TT
#include "linux/unistd.h"
int do_set_thread_area_tt(user_desc_t *info)
{
int ret;
ret = syscall(__NR_set_thread_area,info);
if (ret < 0) {
ret = -errno;
}
return ret;
}
int do_get_thread_area_tt(user_desc_t *info)
{
int ret;
ret = syscall(__NR_get_thread_area,info);
if (ret < 0) {
ret = -errno;
}
return ret;
}
#endif /* UML_CONFIG_MODE_TT */

2
arch/um/scripts/Makefile.rules
View File

@ -21,7 +21,7 @@ $(UNPROFILE_OBJS:.o=.%): \
$(UNPROFILE_OBJS) : CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ \
-Dunix -D__unix__ -D__$(SUBARCH)__ $(CF)
# The stubs and unmap.o can't try to call mcount or update basic block data
# The stubs can't try to call mcount or update basic block data
define unprofile
$(patsubst -pg,,$(patsubst -fprofile-arcs -ftest-coverage,,$(1)))
endef

10
arch/um/sys-i386/Makefile
View File

@ -1,8 +1,6 @@
obj-y = bug.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
ptrace_user.o setjmp.o signal.o sigcontext.o syscalls.o sysrq.o \
sys_call_table.o tls.o
obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
ptrace_user.o setjmp.o signal.o sigcontext.o stub.o stub_segv.o \
syscalls.o sysrq.o sys_call_table.o tls.o
subarch-obj-y = lib/bitops_32.o lib/semaphore_32.o lib/string_32.o
subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem_32.o
@ -13,11 +11,7 @@ USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o
USER_OBJS += user-offsets.s
extra-y += user-offsets.s
extra-$(CONFIG_MODE_TT) += unmap.o
UNPROFILE_OBJS := stub_segv.o
CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
include arch/um/scripts/Makefile.rules
$(obj)/unmap.%: _c_flags = $(call unprofile,$(CFLAGS))

67
arch/um/sys-i386/ldt.c
View File

@ -19,72 +19,6 @@
extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
#ifdef CONFIG_MODE_TT
static long do_modify_ldt_tt(int func, void __user *ptr,
unsigned long bytecount)
{
struct user_desc info;
int res = 0;
void *buf = NULL;
void *p = NULL; /* What we pass to host. */
switch(func){
case 1:
case 0x11: /* write_ldt */
/* Do this check now to avoid overflows. */
if (bytecount != sizeof(struct user_desc)) {
res = -EINVAL;
goto out;
}
if(copy_from_user(&info, ptr, sizeof(info))) {
res = -EFAULT;
goto out;
}
p = &info;
break;
case 0:
case 2: /* read_ldt */
/* The use of info avoids kmalloc on the write case, not on the
* read one. */
buf = kmalloc(bytecount, GFP_KERNEL);
if (!buf) {
res = -ENOMEM;
goto out;
}
p = buf;
break;
default:
res = -ENOSYS;
goto out;
}
res = modify_ldt(func, p, bytecount);
if(res < 0)
goto out;
switch(func){
case 0:
case 2:
/* Modify_ldt was for reading and returned the number of read
* bytes.*/
if(copy_to_user(ptr, p, res))
res = -EFAULT;
break;
}
out:
kfree(buf);
return res;
}
#endif
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
#include "skas_ptrace.h"
#include "asm/mmu_context.h"
@ -569,7 +503,6 @@ void free_ldt(struct mmu_context_skas * mm)
}
mm->ldt.entry_count = 0;
}
#endif
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
{

120
arch/um/sys-i386/ptrace.c
View File

@ -14,12 +14,6 @@
#include "sysdep/sigcontext.h"
#include "sysdep/sc.h"
void arch_switch_to_tt(struct task_struct *from, struct task_struct *to)
{
update_debugregs(to->thread.arch.debugregs_seq);
arch_switch_tls_tt(from, to);
}
void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
{
int err = arch_switch_tls_skas(from, to);
@ -233,79 +227,12 @@ static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave
return ret;
}
/*
* FXSR floating point environment conversions.
*/
#ifdef CONFIG_MODE_TT
static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
struct pt_regs *regs)
{
struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
unsigned long env[7];
struct _fpreg __user *to;
struct _fpxreg *from;
int i;
env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
env[1] = (unsigned long)fxsave->swd | 0xffff0000;
env[2] = twd_fxsr_to_i387(fxsave);
env[3] = fxsave->fip;
env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
env[5] = fxsave->foo;
env[6] = fxsave->fos;
if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
return 1;
to = &buf->_st[0];
from = (struct _fpxreg *) &fxsave->st_space[0];
for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
if ( __copy_to_user( to, from, sizeof(*to) ) )
return 1;
}
return 0;
}
#endif
static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
struct pt_regs *regs)
{
return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
}
#ifdef CONFIG_MODE_TT
static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
struct _fpstate __user *buf)
{
struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
unsigned long env[7];
struct _fpxreg *to;
struct _fpreg __user *from;
int i;
if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
return 1;
fxsave->cwd = (unsigned short)(env[0] & 0xffff);
fxsave->swd = (unsigned short)(env[1] & 0xffff);
fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
fxsave->fip = env[3];
fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
fxsave->fcs = (env[4] & 0xffff);
fxsave->foo = env[5];
fxsave->fos = env[6];
to = (struct _fpxreg *) &fxsave->st_space[0];
from = &buf->_st[0];
for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
if ( __copy_from_user( to, from, sizeof(*from) ) )
return 1;
}
return 0;
}
#endif
static inline int convert_fxsr_from_user(struct pt_regs *regs,
struct _fpstate __user *buf)
{
@ -332,39 +259,11 @@ int set_fpregs(unsigned long buf, struct task_struct *child)
else return(0);
}
#ifdef CONFIG_MODE_TT
int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
{
struct pt_regs *regs = &tsk->thread.regs;
struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
int err;
err = __copy_to_user((void __user *) buf, fxsave,
sizeof(struct user_fxsr_struct));
if(err) return -EFAULT;
else return 0;
}
#endif
int get_fpxregs(unsigned long buf, struct task_struct *tsk)
{
return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
}
#ifdef CONFIG_MODE_TT
int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
{
struct pt_regs *regs = &tsk->thread.regs;
struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
int err;
err = __copy_from_user(fxsave, (void __user *) buf,
sizeof(struct user_fxsr_struct) );
if(err) return -EFAULT;
else return 0;
}
#endif
int set_fpxregs(unsigned long buf, struct task_struct *tsk)
{
return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
@ -387,25 +286,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
#endif
#ifdef CONFIG_MODE_TT
static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
struct user_i387_struct *buf)
{
struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
unsigned short *to;
unsigned short *from;
int i;
memcpy( buf, fpu, 7 * sizeof(long) );
to = (unsigned short *) &buf->st_space[0];
from = (unsigned short *) &fpu->st_space[0];
for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
memcpy( to, from, 5 * sizeof(unsigned short) );
}
}
#endif
static inline void copy_fpu_fxsave(struct pt_regs *regs,
struct user_i387_struct *buf)
{

86
arch/um/sys-i386/ptrace_user.c
View File

@ -43,89 +43,3 @@ int ptrace_setfpregs(long pid, unsigned long *regs)
return -errno;
return 0;
}
#ifdef UML_CONFIG_MODE_TT
static void write_debugregs(int pid, unsigned long *regs)
{
struct user *dummy;
int nregs, i;
dummy = NULL;
nregs = ARRAY_SIZE(dummy->u_debugreg);
for(i = 0; i < nregs; i++){
if((i == 4) || (i == 5)) continue;
if(ptrace(PTRACE_POKEUSR, pid, &dummy->u_debugreg[i],
regs[i]) < 0)
printk("write_debugregs - ptrace failed on "
"register %d, value = 0x%lx, errno = %d\n", i,
regs[i], errno);
}
}
static void read_debugregs(int pid, unsigned long *regs)
{
struct user *dummy;
int nregs, i;
dummy = NULL;
nregs = ARRAY_SIZE(dummy->u_debugreg);
for(i = 0; i < nregs; i++){
regs[i] = ptrace(PTRACE_PEEKUSR, pid,
&dummy->u_debugreg[i], 0);
}
}
/* Accessed only by the tracing thread */
static unsigned long kernel_debugregs[8] = { [ 0 ... 7 ] = 0 };
void arch_enter_kernel(void *task, int pid)
{
read_debugregs(pid, TASK_DEBUGREGS(task));
write_debugregs(pid, kernel_debugregs);
}
void arch_leave_kernel(void *task, int pid)
{
read_debugregs(pid, kernel_debugregs);
write_debugregs(pid, TASK_DEBUGREGS(task));
}
#ifdef UML_CONFIG_PT_PROXY
/* Accessed only by the tracing thread */
static int debugregs_seq;
/* Only called by the ptrace proxy */
void ptrace_pokeuser(unsigned long addr, unsigned long data)
{
if((addr < offsetof(struct user, u_debugreg[0])) ||
(addr > offsetof(struct user, u_debugreg[7])))
return;
addr -= offsetof(struct user, u_debugreg[0]);
addr = addr >> 2;
if(kernel_debugregs[addr] == data) return;
kernel_debugregs[addr] = data;
debugregs_seq++;
}
static void update_debugregs_cb(void *arg)
{
int pid = *((int *) arg);
write_debugregs(pid, kernel_debugregs);
}
/* Optimized out in its header when not defined */
void update_debugregs(int seq)
{
int me;
if(seq == debugregs_seq) return;
me = os_getpid();
initial_thread_cb(update_debugregs_cb, &me);
}
#endif
#endif

58
arch/um/sys-i386/signal.c
View File

@ -13,9 +13,6 @@
#include "sigcontext.h"
#include "registers.h"
#include "mode.h"
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
void copy_sc(union uml_pt_regs *regs, void *from)
@ -108,61 +105,6 @@ int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *t
return copy_to_user(to, &sc, sizeof(sc)) ||
copy_to_user(to_fp, fpregs, sizeof(fpregs));
}
#endif
#ifdef CONFIG_MODE_TT
/* These copy a sigcontext to/from userspace. They copy the fpstate pointer,
* blowing away the old, good one. So, that value is saved, and then restored
* after the sigcontext copy. In copy_from, the variable holding the saved
* fpstate pointer, and the sigcontext that it should be restored to are both
* in the kernel, so we can just restore using an assignment. In copy_to, the
* saved pointer is in the kernel, but the sigcontext is in userspace, so we
* copy_to_user it.
*/
int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from,
int fpsize)
{
struct _fpstate *to_fp;
struct _fpstate __user *from_fp;
unsigned long sigs;
int err;
to_fp = to->fpstate;
sigs = to->oldmask;
err = copy_from_user(to, from, sizeof(*to));
from_fp = to->fpstate;
to->oldmask = sigs;
to->fpstate = to_fp;
if(to_fp != NULL)
err |= copy_from_user(to_fp, from_fp, fpsize);
return err;
}
int copy_sc_to_user_tt(struct sigcontext __user *to, struct _fpstate __user *fp,
struct sigcontext *from, int fpsize, unsigned long sp)
{
struct _fpstate __user *to_fp;
struct _fpstate *from_fp;
int err;
to_fp = (fp ? fp : (struct _fpstate __user *) (to + 1));
from_fp = from->fpstate;
err = copy_to_user(to, from, sizeof(*to));
/* The SP in the sigcontext is the updated one for the signal
* delivery. The sp passed in is the original, and this needs
* to be restored, so we stick it in separately.
*/
err |= copy_to_user(&SC_SP(to), &sp, sizeof(sp));
if(from_fp != NULL){
err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
err |= copy_to_user(to_fp, from_fp, fpsize);
}
return err;
}
#endif
static int copy_sc_from_user(struct pt_regs *to, void __user *from)
{

16
arch/um/sys-i386/tls.c
View File

@ -18,10 +18,7 @@
#include "mode_kern.h"
#include "os.h"
#include "mode.h"
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
#endif
/*
* If needed we can detect when it's uninitialized.
@ -31,7 +28,6 @@
static int host_supports_tls = -1;
int host_gdt_entry_tls_min;
#ifdef CONFIG_MODE_SKAS
int do_set_thread_area_skas(struct user_desc *info)
{
int ret;
@ -53,7 +49,6 @@ int do_get_thread_area_skas(struct user_desc *info)
put_cpu();
return ret;
}
#endif
/*
* sys_get_thread_area: get a yet unused TLS descriptor index.
@ -187,17 +182,6 @@ int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to)
return 0;
}
int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to)
{
if (!host_supports_tls)
return 0;
if (needs_TLS_update(to))
return load_TLS(0, to);
return 0;
}
static int set_tls_entry(struct task_struct* task, struct user_desc *info,
int idx, int flushed)
{

25
arch/um/sys-i386/unmap.c
View File

@ -1,25 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <linux/mman.h>
#include <asm/unistd.h>
static int errno;
static inline _syscall2(int,munmap,void *,start,size_t,len)
static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
int switcheroo(int fd, int prot, void *from, void *to, int size)
{
if(munmap(to, size) < 0){
return(-1);
}
if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
return(-1);
}
if(munmap(from, size) < 0){
return(-1);
}
return(0);
}

9
arch/um/sys-x86_64/Makefile
View File

@ -5,10 +5,9 @@
#
obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
setjmp.o sigcontext.o signal.o syscalls.o syscall_table.o sysrq.o \
ksyms.o tls.o
setjmp.o sigcontext.o signal.o stub.o stub_segv.o syscalls.o \
syscall_table.o sysrq.o ksyms.o tls.o
obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
obj-$(CONFIG_MODULES) += um_module.o
subarch-obj-y = lib/bitops_64.o lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o
@ -21,11 +20,7 @@ USER_OBJS := ptrace_user.o sigcontext.o
USER_OBJS += user-offsets.s
extra-y += user-offsets.s
extra-$(CONFIG_MODE_TT) += unmap.o
UNPROFILE_OBJS := stub_segv.o
CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
include arch/um/scripts/Makefile.rules
$(obj)/unmap.%: _c_flags = $(call unprofile,$(CFLAGS))

50
arch/um/sys-x86_64/signal.c
View File

@ -15,9 +15,6 @@
#include "choose-mode.h"
#include "sysdep/ptrace.h"
#include "frame_kern.h"
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
void copy_sc(union uml_pt_regs *regs, void *from)
@ -134,53 +131,6 @@ int copy_sc_to_user_skas(struct sigcontext __user *to,
return(err);
}
#endif
#ifdef CONFIG_MODE_TT
int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from,
int fpsize)
{
struct _fpstate *to_fp;
struct _fpstate __user *from_fp;
unsigned long sigs;
int err;
to_fp = to->fpstate;
sigs = to->oldmask;
err = copy_from_user(to, from, sizeof(*to));
from_fp = to->fpstate;
to->fpstate = to_fp;
to->oldmask = sigs;
if(to_fp != NULL)
err |= copy_from_user(to_fp, from_fp, fpsize);
return(err);
}
int copy_sc_to_user_tt(struct sigcontext __user *to, struct _fpstate __user *fp,
struct sigcontext *from, int fpsize, unsigned long sp)
{
struct _fpstate __user *to_fp;
struct _fpstate *from_fp;
int err;
to_fp = (fp ? fp : (struct _fpstate __user *) (to + 1));
from_fp = from->fpstate;
err = copy_to_user(to, from, sizeof(*to));
/* The SP in the sigcontext is the updated one for the signal
* delivery. The sp passed in is the original, and this needs
* to be restored, so we stick it in separately.
*/
err |= copy_to_user(&SC_SP(to), &sp, sizeof(sp));
if(from_fp != NULL){
err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
err |= copy_to_user(to_fp, from_fp, fpsize);
}
return err;
}
#endif
static int copy_sc_from_user(struct pt_regs *to, void __user *from)
{
int ret;

31
arch/um/sys-x86_64/syscalls.c
View File

@ -29,36 +29,6 @@ asmlinkage long sys_uname64(struct new_utsname __user * name)
return err ? -EFAULT : 0;
}
#ifdef CONFIG_MODE_TT
extern long arch_prctl(int code, unsigned long addr);
static long arch_prctl_tt(int code, unsigned long addr)
{
unsigned long tmp;
long ret;
switch(code){
case ARCH_SET_GS:
case ARCH_SET_FS:
ret = arch_prctl(code, addr);
break;
case ARCH_GET_FS:
case ARCH_GET_GS:
ret = arch_prctl(code, (unsigned long) &tmp);
if(!ret)
ret = put_user(tmp, (long __user *)addr);
break;
default:
ret = -EINVAL;
break;
}
return(ret);
}
#endif
#ifdef CONFIG_MODE_SKAS
long arch_prctl_skas(struct task_struct *task, int code,
unsigned long __user *addr)
{
@ -119,7 +89,6 @@ long arch_prctl_skas(struct task_struct *task, int code,
return ret;
}
#endif
long sys_arch_prctl(int code, unsigned long addr)
{

25
arch/um/sys-x86_64/unmap.c
View File

@ -1,25 +0,0 @@
/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <linux/mman.h>
#include <asm/unistd.h>
static int errno;
static inline _syscall2(int,munmap,void *,start,size_t,len)
static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
int switcheroo(int fd, int prot, void *from, void *to, int size)
{
if(munmap(to, size) < 0){
return(-1);
}
if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
return(-1);
}
if(munmap(from, size) < 0){
return(-1);
}
return(0);
}

6
include/asm-um/mmu_context.h
View File

@ -56,12 +56,6 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
extern int init_new_context_skas(struct task_struct *task,
struct mm_struct *mm);
static inline int init_new_context_tt(struct task_struct *task,
struct mm_struct *mm)
{
return(0);
}
static inline int init_new_context(struct task_struct *task,
struct mm_struct *mm)
{

14
include/asm-um/processor-generic.h
View File

@ -34,20 +34,10 @@ struct thread_struct {
void *exec_buf;
struct arch_thread arch;
union {
#ifdef CONFIG_MODE_TT
struct {
int extern_pid;
int tracing;
int switch_pipe[2];
int vm_seq;
} tt;
#endif
#ifdef CONFIG_MODE_SKAS
struct {
jmp_buf switch_buf;
int mm_count;
} skas;
#endif
} mode;
struct {
int op;
@ -136,12 +126,8 @@ extern struct cpuinfo_um cpu_data[];
#endif
#ifdef CONFIG_MODE_SKAS
#define KSTK_REG(tsk, reg) \
get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
#else
#define KSTK_REG(tsk, reg) (0xbadbabe)
#endif
#define get_wchan(p) (0)
#endif