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[glibc.git] / sysdeps / m68k / setjmp.c
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1 /* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 #include <setjmp.h>
21 /* Save the current program position in ENV and return 0. */
22 int
23 __sigsetjmp (jmp_buf env, int savemask)
25 /* Save data registers D1 through D7. */
26 asm volatile ("movem%.l %/d1-%/d7, %0"
27 : : "m" (env[0].__jmpbuf[0].__dregs[0]));
29 /* Save return address in place of register A0. */
30 env[0].__jmpbuf[0].__aregs[0] = ((void **) &env)[-1];
32 /* Save address registers A1 through A5. */
33 asm volatile ("movem%.l %/a1-%/a5, %0"
34 : : "m" (env[0].__jmpbuf[0].__aregs[1]));
36 /* Save caller's FP, not our own. */
37 env[0].__jmpbuf[0].__fp = ((void **) &env)[-2];
39 /* Save caller's SP, not our own. */
40 env[0].__jmpbuf[0].__sp = (void *) &env;
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
48 /* Save the signal mask if requested. */
49 return __sigjmp_save (env, savemask);