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| author | The Android Open Source Project <initial-contribution@android.com> | 2008-12-17 18:03:48 -0800 |
|---|---|---|
| committer | The Android Open Source Project <initial-contribution@android.com> | 2008-12-17 18:03:48 -0800 |
| commit | 4e468ed2eb86a2406e14f1eca82072ee501d05fd (patch) | |
| tree | 4e05b3c66eef86531e464521a3bf96a1864d4bf5 /libc/arch-x86/bionic/vfork.S | |
| parent | a27d2baa0c1a2ec70f47ea9199b1dd6762c8a349 (diff) | |
| download | bionic-4e468ed2eb86a2406e14f1eca82072ee501d05fd.zip bionic-4e468ed2eb86a2406e14f1eca82072ee501d05fd.tar.gz bionic-4e468ed2eb86a2406e14f1eca82072ee501d05fd.tar.bz2 | |
Code drop from //branches/cupcake/...@124589
Diffstat (limited to 'libc/arch-x86/bionic/vfork.S')
| -rw-r--r-- | libc/arch-x86/bionic/vfork.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/libc/arch-x86/bionic/vfork.S b/libc/arch-x86/bionic/vfork.S new file mode 100644 index 0000000..53910ab --- /dev/null +++ b/libc/arch-x86/bionic/vfork.S @@ -0,0 +1,30 @@ +#include <sys/linux-syscalls.h> + +#ifndef __NR_vfork +#define __NR_vfork 190 +#endif + + + .text + .type vfork, @function + .globl vfork + .align 4 + +/* Get rid of the stack modifications (popl/ret) after vfork() success. + * vfork is VERY sneaky. One has to be very careful about what can be done + * between a successful vfork and a a subsequent execve() + */ + +vfork: + /* grab the return address */ + popl %ecx + movl $__NR_vfork, %eax + int $0x80 + cmpl $-129, %eax + jb 1f + negl %eax + pushl %eax + call __set_errno + orl $-1, %eax +1: + jmp *%ecx |