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>

3 files changed, 13 insertions, 36 deletions

diff --git a/arch/m32r/include/asm/ptrace.h b/arch/m32r/include/asm/ptrace.h
index 4313aa62b51b..c4432f1fb2cf 100644
--- a/arch/m32r/include/asm/ptrace.h
+++ b/arch/m32r/include/asm/ptrace.h
@@ -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 */
 
diff --git a/arch/m32r/include/asm/unistd.h b/arch/m32r/include/asm/unistd.h
index d5e66a480782..b27bdcbc7c2c 100644
--- a/arch/m32r/include/asm/unistd.h
+++ b/arch/m32r/include/asm/unistd.h
@@ -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
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index fa89f027c04a..62c713f5694a 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -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);
 }
 
@@ -250,38 +248,14 @@ 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..
  */
 #define first_sched     ((unsigned long) scheduling_functions_start_here)