55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <setjmp.h>
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#include <stdlib.h>
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void
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longjmp (jmp_buf env, int val)
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{
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val = val == 0 ? 1 : val;
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// *INDENT-OFF*
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asm (
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"mov 0x00(%rdi),%rbp\n\t" // env->__bp
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"mov 0x08(%rdi),%rbx\n\t" // env->__pc
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"mov 0x10(%rdi),%rsp\n\t" // env->__sp
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"jmp *%rbx\n\t" // jmp *PC
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);
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// *INDENT-ON*
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// not reached
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exit (42);
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}
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int
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setjmp (jmp_buf env)
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{
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long *p;
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// *INDENT-OFF*
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asm ("mov %%rbp,%0"
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: "=r" (p)
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: //no inputs ""
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);
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// *INDENT-ON*
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env[0].__bp = (long) p;
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env[0].__pc = p[1];
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env[0].__sp = p[0];
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return 0;
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}
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