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MN10300: Add utrace/tracehooks support

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Add utrace/tracehooks support to MN10300.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2009-06-11 13:08:37 +01:00 committed by Linus Torvalds
parent fd4f683d04
commit 5d289964e1
7 changed files with 264 additions and 246 deletions
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1
arch/mn10300/Kconfig
View File

@ -8,6 +8,7 @@ mainmenu "Linux Kernel Configuration"
config MN10300
def_bool y
select HAVE_OPROFILE
select HAVE_ARCH_TRACEHOOK
config AM33
def_bool y

3
arch/mn10300/include/asm/elf.h
View File

@ -34,7 +34,7 @@
*/
typedef unsigned long elf_greg_t;
#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
#define ELF_NGREG ((sizeof(struct pt_regs) / sizeof(elf_greg_t)) - 1)
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
#define ELF_NFPREG 32
@ -76,6 +76,7 @@ do { \
} while (0)
#define USE_ELF_CORE_DUMP
#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE 4096
/*

8
arch/mn10300/include/asm/processor.h
View File

@ -143,13 +143,7 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(task) \
({ \
struct pt_regs *__regs__; \
__regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
__regs__ - 1; \
})
#define task_pt_regs(task) ((task)->thread.uregs)
#define KSTK_EIP(task) (task_pt_regs(task)->pc)
#define KSTK_ESP(task) (task_pt_regs(task)->sp)

8
arch/mn10300/include/asm/ptrace.h
View File

@ -91,9 +91,17 @@ extern struct pt_regs *__frame; /* current frame pointer */
#if defined(__KERNEL__)
#if !defined(__ASSEMBLY__)
struct task_struct;
#define user_mode(regs) (((regs)->epsw & EPSW_nSL) == EPSW_nSL)
#define instruction_pointer(regs) ((regs)->pc)
#define user_stack_pointer(regs) ((regs)->sp)
extern void show_regs(struct pt_regs *);
#define arch_has_single_step() (1)
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);
#endif /* !__ASSEMBLY */
#define profile_pc(regs) ((regs)->pc)

13
arch/mn10300/kernel/entry.S
View File

@ -76,7 +76,7 @@ ENTRY(system_call)
cmp nr_syscalls,d0
bcc syscall_badsys
btst _TIF_SYSCALL_TRACE,(TI_flags,a2)
bne syscall_trace_entry
bne syscall_entry_trace
syscall_call:
add d0,d0,a1
add a1,a1
@ -104,11 +104,10 @@ restore_all:
syscall_exit_work:
btst _TIF_SYSCALL_TRACE,d2
beq work_pending
__sti # could let do_syscall_trace() call
__sti # could let syscall_trace_exit() call
# schedule() instead
mov fp,d0
mov 1,d1
call do_syscall_trace[],0 # do_syscall_trace(regs,entryexit)
call syscall_trace_exit[],0 # do_syscall_trace(regs)
jmp resume_userspace
ALIGN
@ -138,13 +137,11 @@ work_notifysig:
jmp resume_userspace
# perform syscall entry tracing
syscall_trace_entry:
syscall_entry_trace:
mov -ENOSYS,d0
mov d0,(REG_D0,fp)
mov fp,d0
clr d1
call do_syscall_trace[],0
mov (REG_ORIG_D0,fp),d0
call syscall_trace_entry[],0 # returns the syscall number to actually use
mov (REG_D1,fp),d1
cmp nr_syscalls,d0
bcs syscall_call

468
arch/mn10300/kernel/ptrace.c
View File

@ -17,6 +17,9 @@
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
@ -64,12 +67,6 @@ static inline int get_stack_long(struct task_struct *task, int offset)
((unsigned long) task->thread.uregs + offset);
}
/*
* this routine will put a word on the processes privileged stack.
* the offset is how far from the base addr as stored in the TSS.
* this routine assumes that all the privileged stacks are in our
* data space.
*/
static inline
int put_stack_long(struct task_struct *task, int offset, unsigned long data)
{
@ -80,44 +77,191 @@ int put_stack_long(struct task_struct *task, int offset, unsigned long data)
return 0;
}
static inline unsigned long get_fpregs(struct fpu_state_struct *buf,
struct task_struct *tsk)
/*
* retrieve the contents of MN10300 userspace general registers
*/
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
return __copy_to_user(buf, &tsk->thread.fpu_state,
sizeof(struct fpu_state_struct));
}
const struct pt_regs *regs = task_pt_regs(target);
int ret;
static inline unsigned long set_fpregs(struct task_struct *tsk,
struct fpu_state_struct *buf)
{
return __copy_from_user(&tsk->thread.fpu_state, buf,
sizeof(struct fpu_state_struct));
}
/* we need to skip regs->next */
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs, 0, PT_ORIG_D0 * sizeof(long));
if (ret < 0)
return ret;
static inline void fpsave_init(struct task_struct *task)
{
memset(&task->thread.fpu_state, 0, sizeof(struct fpu_state_struct));
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
NR_PTREGS * sizeof(long));
if (ret < 0)
return ret;
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
NR_PTREGS * sizeof(long), -1);
}
/*
* make sure the single step bit is not set
* update the contents of the MN10300 userspace general registers
*/
void ptrace_disable(struct task_struct *child)
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
struct pt_regs *regs = task_pt_regs(target);
unsigned long tmp;
int ret;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
tmp &= ~EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
/* we need to skip regs->next */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs, 0, PT_ORIG_D0 * sizeof(long));
if (ret < 0)
return ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
PT_EPSW * sizeof(long));
if (ret < 0)
return ret;
/* we need to mask off changes to EPSW */
tmp = regs->epsw;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&tmp, PT_EPSW * sizeof(long),
PT_PC * sizeof(long));
tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
EPSW_FLAG_Z);
regs->epsw = tmp;
if (ret < 0)
return ret;
/* and finally load the PC */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->pc, PT_PC * sizeof(long),
NR_PTREGS * sizeof(long));
if (ret < 0)
return ret;
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
NR_PTREGS * sizeof(long), -1);
}
/*
* set the single step bit
* retrieve the contents of MN10300 userspace FPU registers
*/
void ptrace_enable(struct task_struct *child)
static int fpuregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
int ret;
unlazy_fpu(target);
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
fpregs, 0, sizeof(*fpregs));
if (ret < 0)
return ret;
return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
sizeof(*fpregs), -1);
}
/*
* update the contents of the MN10300 userspace FPU registers
*/
static int fpuregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct fpu_state_struct fpu_state = target->thread.fpu_state;
int ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&fpu_state, 0, sizeof(fpu_state));
if (ret < 0)
return ret;
fpu_kill_state(target);
target->thread.fpu_state = fpu_state;
set_using_fpu(target);
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
sizeof(fpu_state), -1);
}
/*
* determine if the FPU registers have actually been used
*/
static int fpuregs_active(struct task_struct *target,
const struct user_regset *regset)
{
return is_using_fpu(target) ? regset->n : 0;
}
/*
* Define the register sets available on the MN10300 under Linux
*/
enum mn10300_regset {
REGSET_GENERAL,
REGSET_FPU,
};
static const struct user_regset mn10300_regsets[] = {
/*
* General register format is:
* A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
* E1, E0, E7...E2, SP, LAR, LIR, MDR
* A1, A0, D1, D0, ORIG_D0, EPSW, PC
*/
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(long),
.align = sizeof(long),
.get = genregs_get,
.set = genregs_set,
},
/*
* FPU register format is:
* FS0-31, FPCR
*/
[REGSET_FPU] = {
.core_note_type = NT_PRFPREG,
.n = sizeof(struct fpu_state_struct) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.get = fpuregs_get,
.set = fpuregs_set,
.active = fpuregs_active,
},
};
static const struct user_regset_view user_mn10300_native_view = {
.name = "mn10300",
.e_machine = EM_MN10300,
.regsets = mn10300_regsets,
.n = ARRAY_SIZE(mn10300_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_mn10300_native_view;
}
/*
* set the single-step bit
*/
void user_enable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
@ -129,45 +273,37 @@ void ptrace_enable(struct task_struct *child)
#endif
}
/*
* make sure the single-step bit is not set
*/
void user_disable_single_step(struct task_struct *child)
{
#ifndef CONFIG_MN10300_USING_JTAG
struct user *dummy = NULL;
long tmp;
tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
tmp &= ~EPSW_T;
put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
#endif
}
void ptrace_disable(struct task_struct *child)
{
user_disable_single_step(child);
}
/*
* handle the arch-specific side of process tracing
*/
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
struct fpu_state_struct fpu_state;
int i, ret;
unsigned long tmp;
int ret;
switch (request) {
/* read the word at location addr. */
case PTRACE_PEEKTEXT: {
unsigned long tmp;
int copied;
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
ret = -EIO;
if (copied != sizeof(tmp))
break;
ret = put_user(tmp, (unsigned long *) data);
break;
}
/* read the word at location addr. */
case PTRACE_PEEKDATA: {
unsigned long tmp;
int copied;
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
ret = -EIO;
if (copied != sizeof(tmp))
break;
ret = put_user(tmp, (unsigned long *) data);
break;
}
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
unsigned long tmp;
case PTRACE_PEEKUSR:
ret = -EIO;
if ((addr & 3) || addr < 0 ||
addr > sizeof(struct user) - 3)
@ -179,17 +315,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
ptrace_regid_to_frame[addr]);
ret = put_user(tmp, (unsigned long *) data);
break;
}
/* write the word at location addr. */
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
if (access_process_vm(child, addr, &data, sizeof(data), 1) ==
sizeof(data))
ret = 0;
else
ret = -EIO;
break;
/* write the word at location addr in the USER area */
case PTRACE_POKEUSR:
@ -204,132 +329,32 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
data);
break;
/* continue and stop at next (return from) syscall */
case PTRACE_SYSCALL:
/* restart after signal. */
case PTRACE_CONT:
ret = -EIO;
if ((unsigned long) data > _NSIG)
break;
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
ptrace_disable(child);
wake_up_process(child);
ret = 0;
break;
case PTRACE_GETREGS: /* Get all integer regs from the child. */
return copy_regset_to_user(child, &user_mn10300_native_view,
REGSET_GENERAL,
0, NR_PTREGS * sizeof(long),
(void __user *)data);
/*
* make the child exit
* - the best I can do is send it a sigkill
* - perhaps it should be put in the status that it wants to
* exit
*/
case PTRACE_KILL:
ret = 0;
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
child->exit_code = SIGKILL;
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
ptrace_disable(child);
wake_up_process(child);
break;
case PTRACE_SETREGS: /* Set all integer regs in the child. */
return copy_regset_from_user(child, &user_mn10300_native_view,
REGSET_GENERAL,
0, NR_PTREGS * sizeof(long),
(const void __user *)data);
case PTRACE_SINGLESTEP: /* set the trap flag. */
#ifndef CONFIG_MN10300_USING_JTAG
ret = -EIO;
if ((unsigned long) data > _NSIG)
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
ptrace_enable(child);
child->exit_code = data;
wake_up_process(child);
ret = 0;
#else
ret = -EINVAL;
#endif
break;
case PTRACE_GETFPREGS: /* Get the child FPU state. */
return copy_regset_to_user(child, &user_mn10300_native_view,
REGSET_FPU,
0, sizeof(struct fpu_state_struct),
(void __user *)data);
case PTRACE_DETACH: /* detach a process that was attached. */
ret = ptrace_detach(child, data);
break;
/* Get all gp regs from the child. */
case PTRACE_GETREGS: {
unsigned long tmp;
if (!access_ok(VERIFY_WRITE, (unsigned *) data, NR_PTREGS << 2)) {
ret = -EIO;
break;
}
for (i = 0; i < NR_PTREGS << 2; i += 4) {
tmp = get_stack_long(child, ptrace_regid_to_frame[i]);
__put_user(tmp, (unsigned long *) data);
data += sizeof(tmp);
}
ret = 0;
break;
}
case PTRACE_SETREGS: { /* Set all gp regs in the child. */
unsigned long tmp;
if (!access_ok(VERIFY_READ, (unsigned long *)data,
sizeof(struct pt_regs))) {
ret = -EIO;
break;
}
for (i = 0; i < NR_PTREGS << 2; i += 4) {
__get_user(tmp, (unsigned long *) data);
put_stack_long(child, ptrace_regid_to_frame[i], tmp);
data += sizeof(tmp);
}
ret = 0;
break;
}
case PTRACE_GETFPREGS: { /* Get the child FPU state. */
if (is_using_fpu(child)) {
unlazy_fpu(child);
fpu_state = child->thread.fpu_state;
} else {
memset(&fpu_state, 0, sizeof(fpu_state));
}
ret = -EIO;
if (copy_to_user((void *) data, &fpu_state,
sizeof(fpu_state)) == 0)
ret = 0;
break;
}
case PTRACE_SETFPREGS: { /* Set the child FPU state. */
ret = -EFAULT;
if (copy_from_user(&fpu_state, (const void *) data,
sizeof(fpu_state)) == 0) {
fpu_kill_state(child);
child->thread.fpu_state = fpu_state;
set_using_fpu(child);
ret = 0;
}
break;
}
case PTRACE_SETOPTIONS: {
if (data & PTRACE_O_TRACESYSGOOD)
child->ptrace |= PT_TRACESYSGOOD;
else
child->ptrace &= ~PT_TRACESYSGOOD;
ret = 0;
break;
}
case PTRACE_SETFPREGS: /* Set the child FPU state. */
return copy_regset_from_user(child, &user_mn10300_native_view,
REGSET_FPU,
0, sizeof(struct fpu_state_struct),
(const void __user *)data);
default:
ret = -EIO;
ret = ptrace_request(child, request, addr, data);
break;
}
@ -337,43 +362,26 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
}
/*
* notification of system call entry/exit
* - triggered by current->work.syscall_trace
* handle tracing of system call entry
* - return the revised system call number or ULONG_MAX to cause ENOSYS
*/
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
{
#if 0
/* just in case... */
printk(KERN_DEBUG "[%d] syscall_%lu(%lx,%lx,%lx,%lx) = %lx\n",
current->pid,
regs->orig_d0,
regs->a0,
regs->d1,
regs->a3,
regs->a2,
regs->d0);
return;
#endif
if (tracehook_report_syscall_entry(regs))
/* tracing decided this syscall should not happen, so
* We'll return a bogus call number to get an ENOSYS
* error, but leave the original number in
* regs->orig_d0
*/
return ULONG_MAX;
if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
!test_thread_flag(TIF_SINGLESTEP))
return;
if (!(current->ptrace & PT_PTRACED))
return;
/* the 0x80 provides a way for the tracing parent to distinguish
between a syscall stop and SIGTRAP delivery */
ptrace_notify(SIGTRAP |
((current->ptrace & PT_TRACESYSGOOD) &&
!test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
/*
* this isn't the same as continuing with a signal, but it will do
* for normal use. strace only continues with a signal if the
* stopping signal is not SIGTRAP. -brl
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
return regs->orig_d0;
}
/*
* handle tracing of system call exit
*/
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
}

9
arch/mn10300/kernel/signal.c
View File

@ -23,6 +23,7 @@
#include <linux/tty.h>
#include <linux/personality.h>
#include <linux/suspend.h>
#include <linux/tracehook.h>
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
@ -511,6 +512,9 @@ static void do_signal(struct pt_regs *regs)
* clear the TIF_RESTORE_SIGMASK flag */
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
tracehook_signal_handler(signr, &info, &ka, regs,
test_thread_flag(TIF_SINGLESTEP));
}
return;
@ -561,4 +565,9 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
/* deal with pending signal delivery */
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
do_signal(regs);
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(__frame);
}
}