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m32r: switch to generic sys_execve() 

... and get rid of the horrors in fork()/vfork()/clone() prototypes.
It's fscking faster to calculate pt_regs in question than to fetch
the pointer from stack...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-15 16:37:12 -04:00
parent ea4a1da9b2
commit 8eae10e86c
3 changed files with 13 additions and 36 deletions
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2
arch/m32r/include/asm/ptrace.h
View File

@ -139,6 +139,8 @@ extern void withdraw_debug_trap(struct pt_regs *regs);
#define task_pt_regs(task) \
((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
#define current_pt_regs() ((struct pt_regs *) \
((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
#endif /* __KERNEL */

1
arch/m32r/include/asm/unistd.h
View File

@ -352,6 +352,7 @@
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __IGNORE_lchown
#define __IGNORE_setuid

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

@ -216,12 +216,11 @@ int copy_thread(unsigned long clone_flags, unsigned long spu,
return 0;
}
asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
asmlinkage int sys_fork(void)
{
#ifdef CONFIG_MMU
return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
struct pt_regs *regs = current_pt_regs();
return do_fork(SIGCHLD, regs->spu, regs, 0, NULL, NULL);
#else
return -EINVAL;
#endif /* CONFIG_MMU */
@ -229,14 +228,13 @@ asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
unsigned long parent_tidptr,
unsigned long child_tidptr,
unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
unsigned long child_tidptr)
{
struct pt_regs *regs = current_pt_regs();
if (!newsp)
newsp = regs.spu;
newsp = regs->spu;
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, regs, 0,
(int __user *)parent_tidptr, (int __user *)child_tidptr);
}
@ -250,37 +248,13 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
struct pt_regs regs)
asmlinkage int sys_vfork(void)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
struct pt_regs *regs = current_pt_regs();
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->spu, regs, 0,
NULL, NULL);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char __user *ufilename,
const char __user *const __user *uargv,
const char __user *const __user *uenvp,
unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name, uargv, uenvp, &regs);
putname(filename);
out:
return error;
}
/*
* These bracket the sleeping functions..
*/