| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame^] | 1 | #include <sys/linux-syscalls.h> |
| 2 | |
| 3 | #ifndef __NR_vfork |
| 4 | #define __NR_vfork 190 |
| 5 | #endif |
| 6 | |
| 7 | |
| 8 | .text |
| 9 | .type vfork, @function |
| 10 | .globl vfork |
| 11 | .align 4 |
| 12 | |
| 13 | /* Get rid of the stack modifications (popl/ret) after vfork() success. |
| 14 | * vfork is VERY sneaky. One has to be very careful about what can be done |
| 15 | * between a successful vfork and a a subsequent execve() |
| 16 | */ |
| 17 | |
| 18 | vfork: |
| 19 | /* grab the return address */ |
| 20 | popl %ecx |
| 21 | movl $__NR_vfork, %eax |
| 22 | int $0x80 |
| 23 | cmpl $-129, %eax |
| 24 | jb 1f |
| 25 | negl %eax |
| 26 | pushl %eax |
| 27 | call __set_errno |
| 28 | orl $-1, %eax |
| 29 | 1: |
| 30 | jmp *%ecx |