arch/x86_64-all/posixc/vfork_longjmp.s

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 /* This function works the same as longjmp() except it lacks the argument
   7    check. It's used only by vfork() implementation. */
   8
   9         #include "aros/x86_64/asm.h"
  10
  11         .text
  12         _ALIGNMENT
  13         .globl  AROS_CDEFNAME(vfork_longjmp)
  14         _FUNCTION(AROS_CDEFNAME(vfork_longjmp))
  15
  16         .set    FirstArg, 8 /* Skip Return-Adress */
  17         .set    env, FirstArg
  18         .set    val, env+8
  19
  20 AROS_CDEFNAME(vfork_longjmp):
  21     mov %rdi, %rax
  22         /* Restore stack pointer and all registers from env */
  23         mov 120(%rax),%rsp /* Restore original stack */
  24
  25         mov 0(%rax),%rcx
  26         mov %rcx,retaddr(%rsp) /* Restore return address */
  27
  28         push %rsi /* Save return value on new stack */
  29
  30         /* Restore all registers */
  31         mov 8(%rax),%rbx /* %ebx */
  32         mov 16(%rax),%rcx /* %ecx */
  33         mov 24(%rax),%rdx /* %edx */
  34         mov 32(%rax),%rsi /* %esi */
  35         mov 40(%rax),%rdi /* %edi */
  36         mov 48(%rax),%rbp /* %ebp */
  37         mov 56(%rax),%r8
  38         mov 64(%rax),%r9
  39         mov 72(%rax),%r10
  40         mov 80(%rax),%r11
  41         mov 88(%rax),%r12
  42         mov 96(%rax),%r13
  43         mov 104(%rax),%r14
  44         mov 112(%rax),%r15
  45
  46         pop %rax /* Fetch return value */
  47         ret