sysdeps/i386/__longjmp.S

   1 /* longjmp for i386.
   2    Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <sysdep.h>
  21 #define _ASM
  22 #define _SETJMP_H
  23 #include <bits/setjmp.h>
  24 #include <asm-syntax.h>
  25 #include <bp-sym.h>
  26 #include <bp-asm.h>
  27
  28 #define PARMS   LINKAGE         /* no space for saved regs */
  29 #define JBUF    PARMS
  30 #define VAL     JBUF+PTR_SIZE
  31
  32 ENTRY (BP_SYM (__longjmp))
  33         ENTER
  34
  35         movl JBUF(%esp), %ecx   /* User's jmp_buf in %ecx.  */
  36         CHECK_BOUNDS_BOTH_WIDE (%ecx, JBUF(%esp), $JB_SIZE)
  37
  38         movl VAL(%esp), %eax    /* Second argument is return value.  */
  39         /* Save the return address now.  */
  40         movl (JB_PC*4)(%ecx), %edx
  41         /* Restore registers.  */
  42         movl (JB_BX*4)(%ecx), %ebx
  43         movl (JB_SI*4)(%ecx), %esi
  44         movl (JB_DI*4)(%ecx), %edi
  45         movl (JB_BP*4)(%ecx), %ebp
  46         movl (JB_SP*4)(%ecx), %esp
  47         /* Jump to saved PC.  */
  48         jmp *%edx
  49 END (BP_SYM (__longjmp))