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m32r: switch to generic fork/vfork/clone

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-21 16:52:56 -04:00
parent 27d892fb27
commit 92bbe6cdfd
2 changed files with 7 additions and 42 deletions
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3
arch/m32r/include/asm/unistd.h
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@ -353,6 +353,9 @@
#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_FORK
#define __ARCH_WANT_SYS_VFORK
#define __IGNORE_lchown
#define __IGNORE_setuid

46
arch/m32r/kernel/process.c
View File

@ -192,7 +192,7 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
int copy_thread(unsigned long clone_flags, unsigned long spu,
unsigned long arg, struct task_struct *tsk, struct pt_regs *regs)
unsigned long arg, struct task_struct *tsk, struct pt_regs *unused)
{
struct pt_regs *childregs = task_pt_regs(tsk);
extern void ret_from_fork(void);
@ -206,8 +206,9 @@ int copy_thread(unsigned long clone_flags, unsigned long spu,
tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
} else {
/* Copy registers */
*childregs = *regs;
childregs->spu = spu;
*childregs = *current_pt_regs();
if (spu)
childregs->spu = spu;
childregs->r0 = 0; /* Child gets zero as return value */
tsk->thread.lr = (unsigned long)ret_from_fork;
}
@ -216,45 +217,6 @@ int copy_thread(unsigned long clone_flags, unsigned long spu,
return 0;
}
asmlinkage int sys_fork(void)
{
#ifdef CONFIG_MMU
struct pt_regs *regs = current_pt_regs();
return do_fork(SIGCHLD, regs->spu, regs, 0, NULL, NULL);
#else
return -EINVAL;
#endif /* CONFIG_MMU */
}
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidptr,
unsigned long child_tidptr)
{
struct pt_regs *regs = current_pt_regs();
if (!newsp)
newsp = regs->spu;
return do_fork(clone_flags, newsp, regs, 0,
(int __user *)parent_tidptr, (int __user *)child_tidptr);
}
/*
* This is trivial, and on the face of it looks like it
* could equally well be done in user mode.
*
* Not so, for quite unobvious reasons - register pressure.
* In user mode vfork() cannot have a stack frame, and if
* done by calling the "clone()" system call directly, you
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
asmlinkage int sys_vfork(void)
{
struct pt_regs *regs = current_pt_regs();
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->spu, regs, 0,
NULL, NULL);
}
/*
* These bracket the sleeping functions..
*/