arch/x86_64-all/clib/setjmp.s

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id: setjmp.s 12741 2001-12-08 18:16:08Z chodorowski $
   4
   5     Desc: ANSI C function setjmp()
   6     Lang: english
   7 */
   8
   9 /******************************************************************************
  10
  11     NAME
  12 #include <setjmp.h>
  13
  14         int setjmp (jmp_buf env);
  15
  16     FUNCTION
  17         Save the current context so that you can return to it later.
  18
  19     INPUTS
  20         env - The context/environment is saved here for later restoring
  21
  22     RESULT
  23         0 if it returns from setjmp() and 1 when it returns from longjmp().
  24
  25     NOTES
  26
  27     EXAMPLE
  28         jmp_buf env;
  29
  30         ... some code ...
  31
  32         if (!setjmp (env))
  33         {
  34             ... this code is executed after setjmp() returns ...
  35
  36             // This is no good example on how to use this function
  37             // You should not do that
  38             if (error)
  39                 longjmp (env, 5);
  40
  41             ... some code ...
  42         }
  43         else
  44         {
  45             ... this code is executed if you call longjmp(env) ...
  46         }
  47
  48     BUGS
  49
  50     SEE ALSO
  51         longjmp()
  52
  53     INTERNALS
  54
  55     HISTORY
  56
  57 ******************************************************************************/
  58
  59         #include "aros/x86_64/asm.h"
  60
  61         .text
  62         _ALIGNMENT
  63         .globl  AROS_CDEFNAME(setjmp)
  64         _FUNCTION(AROS_CDEFNAME(setjmp))
  65
  66         .set    retaddr, 0
  67
  68 AROS_CDEFNAME(setjmp):
  69         /* Save stack pointer and all registers into env */
  70         mov %rbx,8(%rdi) /* %ebx */
  71         mov %rcx,16(%rdi) /* %ecx */
  72         mov %rdx,24(%rdi) /* %edx */
  73         mov %rsi,32(%rdi) /* %esi */
  74         mov %rdi,40(%rdi) /* %edi */
  75         mov %rbp,48(%rdi) /* %ebp */
  76         mov %r8,56(%rdi)
  77         mov %r9,64(%rdi)
  78         mov %r10,72(%rdi)
  79         mov %r11,80(%rdi)
  80         mov %r12,88(%rdi)
  81         mov %r13,96(%rdi)
  82         mov %r14,104(%rdi)
  83         mov %r15,112(%rdi)
  84         mov %rsp,120(%rdi) /* %esp */
  85
  86         mov retaddr(%rsp),%rax /* Save return address (%esp has changed) */
  87         mov %rax,0(%rdi)
  88
  89         xor %rax,%rax /* Return 0 */
  90         ret