i386: Make kernel_execve() suitable for stack unwinding

The explicit saving and restoring of %ebx was confusing stack
unwind data consumers, and it is plain unnecessary to do this
within the asm(), since that was only introduced for PIC user
mode consumers of the original _syscall3() macro this was
derived from.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Arnd Bergmann <arnd@arndb.de>
LKML-Reference: <4C7FBC660200007800013F95@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
index d5e06624e34a556552585690b4532509fe21552f..0b0cb5fede1993d8dc45b54ffcf27ff8732c3082 100644 (file)
--- a/arch/x86/kernel/sys_i386_32.c
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -33,8 +33,8 @@ int kernel_execve(const char *filename,
                  const char *const envp[])
 {
        long __res;
-       asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
+       asm volatile ("int $0x80"
        : "=a" (__res)
-       : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
+       : "0" (__NR_execve), "b" (filename), "c" (argv), "d" (envp) : "memory");
        return __res;
 }