ports/sysdeps/m68k/setjmp.c

   1 /* Copyright (C) 1991-2014 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <setjmp.h>
  19
  20 /* Save the current program position in ENV and return 0.  */
  21 int
  22 #if defined BSD_SETJMP
  23 # undef setjmp
  24 # define savemask 1
  25 setjmp (jmp_buf env)
  26 #elif defined BSD__SETJMP
  27 # undef _setjmp
  28 # define savemask 0
  29 _setjmp (jmp_buf env)
  30 #else
  31 __sigsetjmp (jmp_buf env, int savemask)
  32 #endif
  33 {
  34   /* Save data registers D1 through D7.  */
  35   asm volatile ("movem%.l %/d1-%/d7, %0"
  36                 : : "m" (env[0].__jmpbuf[0].__dregs[0]));
  37
  38   /* Save return address in place of register A0.  */
  39   env[0].__jmpbuf[0].__aregs[0] = __builtin_return_address (0);
  40
  41   /* Save address registers A1 through A5.  */
  42   asm volatile ("movem%.l %/a1-%/a5, %0"
  43                 : : "m" (env[0].__jmpbuf[0].__aregs[1]));
  44
  45   /* Save caller's FP, not our own.  */
  46   env[0].__jmpbuf[0].__fp = *(int **) __builtin_frame_address (0);
  47
  48   /* Save caller's SP, not our own.  */
  49   env[0].__jmpbuf[0].__sp = (int *) __builtin_frame_address (0) + 2;
  50
  51 #if defined __HAVE_68881__ || defined __HAVE_FPU__
  52   /* Save floating-point (68881) registers FP0 through FP7.  */
  53   asm volatile ("fmovem%.x %/fp0-%/fp7, %0"
  54                 : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  55 #elif defined (__mcffpu__)
  56   asm volatile ("fmovem %/fp0-%/fp7, %0"
  57                 : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  58 #endif
  59
  60 #if defined NOT_IN_libc && defined IS_IN_rtld
  61   /* In ld.so we never save the signal mask.  */
  62   return 0;
  63 #else
  64   /* Save the signal mask if requested.  */
  65   return __sigjmp_save (env, savemask);
  66 #endif
  67 }
  68 #if !defined BSD_SETJMP && !defined BSD__SETJMP
  69 libc_hidden_def (__sigsetjmp)
  70 #endif