alpha: introduce ret_from_kernel_execve(), switch to generic kernel_execve()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 14 insertions, 19 deletions

diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 7826e227e4d0..3cb6c1188984 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -482,6 +482,7 @@
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_KERNEL_EXECVE
 
 /* "Conditional" syscalls.  What we want is
 
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 421dccf273eb..7e43e1156d10 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -626,6 +626,19 @@ ret_from_kernel_thread:
         jmp     $31, sys_exit
 .end ret_from_kernel_thread
 
+        .globl  ret_from_kernel_execve
+        .align  4
+        .ent    ret_from_kernel_execve
+ret_from_kernel_execve:
+        mov     $16, $sp
+        /* Avoid the HAE being gratuitously wrong, to avoid restoring it.  */
+        ldq     $2, alpha_mv+HAE_CACHE
+        stq     $2, 152($sp)            /* HAE */
+        mov     $31, $19                /* to disable syscall restarts */
+        br      $31, ret_to_user
+
+.end    ret_from_kernel_execve
+
 
 /*
  * Special system calls.  Most of these are special in that they either
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 6b33ecdbc534..f47d764eaa11 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -435,22 +435,3 @@ get_wchan(struct task_struct *p)
         }
         return pc;
 }
-
-int kernel_execve(const char *path, const char *const argv[], const char *const envp[])
-{
-        /* Avoid the HAE being gratuitously wrong, which would cause us
-           to do the whole turn off interrupts thing and restore it.  */
-        struct pt_regs regs = {.hae = alpha_mv.hae_cache};
-        int err = do_execve(path, argv, envp, &regs);
-        if (!err) {
-                struct pt_regs *p = current_pt_regs();
-                /* copy regs to normal position and off to userland we go... */
-                *p = regs;
-                __asm__ __volatile__ (
-                        "mov    %0, $sp;"
-                        "br     $31, ret_from_sys_call"
-                        : : "r"(p));
-        }
-        return err;
-}
-EXPORT_SYMBOL(kernel_execve);