| # | |
| # usr/klibc/arch/x86_64/vfork.S | |
| # | |
| # vfork is nasty - there must be nothing at all on the stack above | |
| # the stack frame of the enclosing function. | |
| # | |
| #include <asm/unistd.h> | |
| .text | |
| .align 4 | |
| .globl vfork | |
| .type vfork, @function | |
| vfork: | |
| pop %rdx /* Return address */ | |
| movl $__NR_vfork, %eax | |
| syscall | |
| push %rdx | |
| cmpq $-4095, %rax | |
| jae 1f | |
| ret | |
| 1: | |
| negl %eax | |
| movl %eax, errno(%rip) | |
| orq $-1, %rax | |
| ret |