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microblaze: switch to generic fork/vfork/clone

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Al Viro 2012-10-27 00:03:41 -04:00
parent f01aceac61
commit f3268edbe6
7 changed files with 12 additions and 56 deletions
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1
arch/microblaze/Kconfig
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@ -28,6 +28,7 @@ config MICROBLAZE
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
select CLONE_BACKWARDS
config SWAP
def_bool n

5
arch/microblaze/include/asm/unistd.h
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@ -423,6 +423,11 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_VFORK
#ifdef CONFIG_MMU
#define __ARCH_WANT_SYS_FORK
#endif
/*
* "Conditional" syscalls

8
arch/microblaze/kernel/entry-nommu.S
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@ -559,14 +559,6 @@ no_work_pending:
rtid r14, 0
nop
sys_vfork:
brid microblaze_vfork
addk r5, r1, r0
sys_clone:
brid microblaze_clone
addk r7, r1, r0
sys_rt_sigreturn_wrapper:
brid sys_rt_sigreturn
addk r5, r1, r0

26
arch/microblaze/kernel/entry.S
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@ -442,18 +442,6 @@ TRAP_return: /* Make global symbol for debugging */
nop;
/* These syscalls need access to the struct pt_regs on the stack, so we
implement them in assembly (they're basically all wrappers anyway). */
C_ENTRY(sys_fork_wrapper):
addi r5, r0, SIGCHLD /* Arg 0: flags */
lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */
addik r7, r1, 0 /* Arg 2: parent context */
add r8, r0, r0 /* Arg 3: (unused) */
add r9, r0, r0; /* Arg 4: (unused) */
brid do_fork /* Do real work (tail-call) */
add r10, r0, r0; /* Arg 5: (unused) */
/* This the initial entry point for a new child thread, with an appropriate
stack in place that makes it look the the child is in the middle of an
syscall. This function is actually `returned to' from switch_thread
@ -475,20 +463,6 @@ C_ENTRY(ret_from_kernel_thread):
brid ret_from_trap
add r3, r0, r0
C_ENTRY(sys_vfork):
brid microblaze_vfork /* Do real work (tail-call) */
addik r5, r1, 0
C_ENTRY(sys_clone):
bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */
lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */
1: addik r7, r1, 0; /* Arg 2: parent context */
lwi r9, r1, PT_R8; /* parent tid. */
lwi r10, r1, PT_R9; /* child tid. */
/* do_fork will pick up TLS from regs->r10. */
brid do_fork /* Do real work (tail-call) */
add r8, r0, r0; /* Arg 3: (unused) */
C_ENTRY(sys_rt_sigreturn_wrapper):
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */

8
arch/microblaze/kernel/process.c
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@ -13,6 +13,7 @@
#include <linux/pm.h>
#include <linux/tick.h>
#include <linux/bitops.h>
#include <linux/ptrace.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h> /* for USER_DS macros */
#include <asm/cacheflush.h>
@ -120,7 +121,7 @@ void flush_thread(void)
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
@ -141,8 +142,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
return 0;
}
*childregs = *regs;
childregs->r1 = usp;
*childregs = *current_pt_regs();
if (usp)
childregs->r1 = usp;
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;

14
arch/microblaze/kernel/sys_microblaze.c
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@ -34,20 +34,6 @@
#include <asm/syscalls.h>
asmlinkage long microblaze_vfork(struct pt_regs *regs)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
regs, 0, NULL, NULL);
}
asmlinkage long microblaze_clone(int flags, unsigned long stack,
struct pt_regs *regs)
{
if (!stack)
stack = regs->r1;
return do_fork(flags, stack, regs, 0, NULL, NULL);
}
asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t pgoff)

6
arch/microblaze/kernel/syscall_table.S
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@ -2,11 +2,7 @@ ENTRY(sys_call_table)
.long sys_restart_syscall /* 0 - old "setup()" system call,
* used for restarting */
.long sys_exit
#ifdef CONFIG_MMU
.long sys_fork_wrapper
#else
.long sys_ni_syscall
#endif
.long sys_fork
.long sys_read
.long sys_write
.long sys_open /* 5 */