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frv: 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 16:40:35 -04:00
parent 0bcfe54049
commit b9763ce33f
2 changed files with 8 additions and 40 deletions
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3
arch/frv/include/asm/unistd.h
View File

@ -30,6 +30,9 @@
#define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND #define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE #define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE
/* /*
* "Conditional" syscalls * "Conditional" syscalls

45
arch/frv/kernel/process.c
View File

@ -139,42 +139,12 @@ inline unsigned long user_stack(const struct pt_regs *regs)
return user_mode(regs) ? regs->sp : 0; return user_mode(regs) ? regs->sp : 0;
} }
asmlinkage int sys_fork(void)
{
#ifndef CONFIG_MMU
/* fork almost works, enough to trick you into looking elsewhere:-( */
return -EINVAL;
#else
return do_fork(SIGCHLD, user_stack(__frame), __frame, 0, NULL, NULL);
#endif
}
asmlinkage int sys_vfork(void)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, user_stack(__frame), __frame, 0,
NULL, NULL);
}
/*****************************************************************************/
/*
* clone a process
* - tlsptr is retrieved by copy_thread()
*/
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
int __user *parent_tidptr, int __user *child_tidptr,
int __user *tlsptr)
{
if (!newsp)
newsp = user_stack(__frame);
return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr);
} /* end sys_clone() */
/* /*
* set up the kernel stack and exception frames for a new process * set up the kernel stack and exception frames for a new process
*/ */
int copy_thread(unsigned long clone_flags, int copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long arg, 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; struct pt_regs *childregs;
@ -182,9 +152,7 @@ int copy_thread(unsigned long clone_flags,
(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE); (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
/* set up the userspace frame (the only place that the USP is stored) */ /* set up the userspace frame (the only place that the USP is stored) */
*childregs = *__kernel_frame0_ptr; *childregs = *current_pt_regs();
p->set_child_tid = p->clear_child_tid = NULL;
p->thread.frame = childregs; p->thread.frame = childregs;
p->thread.curr = p; p->thread.curr = p;
@ -193,18 +161,15 @@ int copy_thread(unsigned long clone_flags,
p->thread.lr = 0; p->thread.lr = 0;
p->thread.frame0 = childregs; p->thread.frame0 = childregs;
if (unlikely(!regs)) { if (unlikely(p->flags & PF_KTHREAD)) {
childregs->gr9 = usp; /* function */ childregs->gr9 = usp; /* function */
childregs->gr8 = arg; childregs->gr8 = arg;
p->thread.pc = (unsigned long) ret_from_kernel_thread; p->thread.pc = (unsigned long) ret_from_kernel_thread;
save_user_regs(p->thread.user); save_user_regs(p->thread.user);
return 0; return 0;
} }
if (usp)
/* set up the userspace frame (the only place that the USP is stored) */ childregs->sp = usp;
*childregs = *regs;
childregs->sp = usp;
childregs->next_frame = NULL; childregs->next_frame = NULL;
p->thread.pc = (unsigned long) ret_from_fork; p->thread.pc = (unsigned long) ret_from_fork;