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i386: Make kernel_execve() suitable for stack unwinding

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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>
This commit is contained in:
Jan Beulich 2010-09-02 14:01:58 +01:00 committed by Ingo Molnar
parent 2bfc96a127
commit 7fe977dab3
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/sys_i386_32.c
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@ -33,8 +33,8 @@ int kernel_execve(const char *filename,
const char *const envp[]) const char *const envp[])
{ {
long __res; long __res;
asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx" asm volatile ("int $0x80"
: "=a" (__res) : "=a" (__res)
: "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory"); : "0" (__NR_execve), "b" (filename), "c" (argv), "d" (envp) : "memory");
return __res; return __res;
} }