sysdeps/m68k/bsd-setjmp.S

   1 /* BSD `setjmp' entry point to `sigsetjmp (..., 1)'.  m68k version.
   2 Copyright (C) 1994 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 /* This just does a tail-call to `__sigsetjmp (ARG, 1)'.
  21    We cannot do it in C because it must be a tail-call, so frame-unwinding
  22    in setjmp doesn't clobber the state restored by longjmp.  */
  23
  24 #include <sysdep.h>
  25
  26 #ifdef MOTOROLA_SYNTAX
  27 #define d0 %d0
  28 #define d1 %d1
  29 #define PUSH(reg)       move.l reg, -(%esp)
  30 #define POP(reg)        move.l (%esp)+, reg
  31 #else
  32 #define PUSH(reg)       movel reg, sp@-
  33 #define POP(reg)        movel sp@+, reg
  34 #endif
  35
  36 ENTRY (setjmp)
  37         POP (d0)                /* Pop return PC.  */
  38         POP (d1)                /* Pop jmp_buf argument.  */
  39         PUSH (#1)               /* Push second argument of one.  */
  40         PUSH (d1)               /* Push back first argument.  */
  41         PUSH (d0)               /* Push back return PC.  */
  42         jmp C_SYMBOL_NAME (__sigsetjmp)