sysdeps/m68k/setjmp.c

   1 /* Copyright (C) 1991, 1992, 1994, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <setjmp.h>
  20
  21 /* Save the current program position in ENV and return 0.  */
  22 int
  23 __sigsetjmp (jmp_buf env, int savemask)
  24 {
  25   /* Save data registers D1 through D7.  */
  26   asm volatile ("movem%.l %/d1-%/d7, %0"
  27                 : : "m" (env[0].__jmpbuf[0].__dregs[0]));
  28
  29   /* Save return address in place of register A0.  */
  30   env[0].__jmpbuf[0].__aregs[0] = ((void **) &env)[-1];
  31
  32   /* Save address registers A1 through A5.  */
  33   asm volatile ("movem%.l %/a1-%/a5, %0"
  34                 : : "m" (env[0].__jmpbuf[0].__aregs[1]));
  35
  36   /* Save caller's FP, not our own.  */
  37   env[0].__jmpbuf[0].__fp = ((void **) &env)[-2];
  38
  39   /* Save caller's SP, not our own.  */
  40   env[0].__jmpbuf[0].__sp = (void *) &env;
  41
  42 #if     defined(__HAVE_68881__) || defined(__HAVE_FPU__)
  43   /* Save floating-point (68881) registers FP0 through FP7.  */
  44   asm volatile ("fmovem%.x %/fp0-%/fp7, %0"
  45                 : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  46 #endif
  47
  48   /* Save the signal mask if requested.  */
  49   return __sigjmp_save (env, savemask);
  50 }