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arm: switch to generic fork/vfork/clone 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-21 15:54:27 -04:00
parent 1d4b4b2994
commit 38a61b6b4a
6 changed files with 13 additions and 55 deletions
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1
arch/arm/Kconfig
View File

@ -55,6 +55,7 @@ config ARM
select SYS_SUPPORTS_APM_EMULATION
select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
select MODULES_USE_ELF_REL
select CLONE_BACKWARDS
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and

3
arch/arm/include/asm/unistd.h
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@ -42,6 +42,9 @@
#define __ARCH_WANT_SYS_SOCKETCALL
#endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE
/*
* "Conditional" syscalls

6
arch/arm/kernel/calls.S
View File

@ -11,7 +11,7 @@
*/
/* 0 */ CALL(sys_restart_syscall)
CALL(sys_exit)
CALL(sys_fork_wrapper)
CALL(sys_fork)
CALL(sys_read)
CALL(sys_write)
/* 5 */ CALL(sys_open)
@ -129,7 +129,7 @@
CALL(OBSOLETE(ABI(sys_ipc, sys_oabi_ipc)))
CALL(sys_fsync)
CALL(sys_sigreturn_wrapper)
/* 120 */ CALL(sys_clone_wrapper)
/* 120 */ CALL(sys_clone)
CALL(sys_setdomainname)
CALL(sys_newuname)
CALL(sys_ni_syscall) /* modify_ldt */
@ -199,7 +199,7 @@
CALL(sys_sendfile)
CALL(sys_ni_syscall) /* getpmsg */
CALL(sys_ni_syscall) /* putpmsg */
/* 190 */ CALL(sys_vfork_wrapper)
/* 190 */ CALL(sys_vfork)
CALL(sys_getrlimit)
CALL(sys_mmap2)
CALL(ABI(sys_truncate64, sys_oabi_truncate64))

16
arch/arm/kernel/entry-common.S
View File

@ -510,22 +510,6 @@ sys_syscall:
b sys_ni_syscall
ENDPROC(sys_syscall)
sys_fork_wrapper:
add r0, sp, #S_OFF
b sys_fork
ENDPROC(sys_fork_wrapper)
sys_vfork_wrapper:
add r0, sp, #S_OFF
b sys_vfork
ENDPROC(sys_vfork_wrapper)
sys_clone_wrapper:
add ip, sp, #S_OFF
str ip, [sp, #4]
b sys_clone
ENDPROC(sys_clone_wrapper)
sys_sigreturn_wrapper:
add r0, sp, #S_OFF
mov why, #0 @ prevent syscall restart handling

11
arch/arm/kernel/process.c
View File

@ -376,17 +376,18 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
int
copy_thread(unsigned long clone_flags, unsigned long stack_start,
unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
unsigned long stk_sz, struct task_struct *p, struct pt_regs *unused)
{
struct thread_info *thread = task_thread_info(p);
struct pt_regs *childregs = task_pt_regs(p);
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
if (likely(regs)) {
*childregs = *regs;
if (likely(!(p->flags & PF_KTHREAD))) {
*childregs = *current_pt_regs();
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
if (stack_start)
childregs->ARM_sp = stack_start;
} else {
memset(childregs, 0, sizeof(struct pt_regs));
thread->cpu_context.r4 = stk_sz;
@ -399,7 +400,7 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
clear_ptrace_hw_breakpoint(p);
if (clone_flags & CLONE_SETTLS)
thread->tp_value = regs->ARM_r3;
thread->tp_value = childregs->ARM_r3;
thread_notify(THREAD_NOTIFY_COPY, thread);

31
arch/arm/kernel/sys_arm.c
View File

@ -28,37 +28,6 @@
#include <linux/uaccess.h>
#include <linux/slab.h>
/* Fork a new task - this creates a new program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_fork(struct pt_regs *regs)
{
#ifdef CONFIG_MMU
return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
#else
/* can not support in nommu mode */
return(-EINVAL);
#endif
}
/* Clone a task - this clones the calling program thread.
* This is called indirectly via a small wrapper
*/
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
int __user *parent_tidptr, int tls_val,
int __user *child_tidptr, struct pt_regs *regs)
{
if (!newsp)
newsp = regs->ARM_sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}
asmlinkage int sys_vfork(struct pt_regs *regs)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
}
/*
* Since loff_t is a 64 bit type we avoid a lot of ABI hassle
* with a different argument ordering.