67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#ifndef __GNUC__
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#error This file uses GNU C extensions; you must compile with GCC.
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#endif
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#define REGS \
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REG (bx);\
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REG (si);\
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REG (di);\
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REG (bp);\
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REG (sp)
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#define REG(xx) register long int xx asm (#xx)
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REGS;
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#undef REG
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/* Jump to the position specified by ENV, causing the
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setjmp call there to return VAL, or 1 if VAL is 0. */
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__NORETURN
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void
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DEFUN(__longjmp, (env, val),
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CONST jmp_buf env AND
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int val)
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{
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/* We specify explicit registers because, when not optimizing,
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the compiler will generate code that uses the frame pointer
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after it's been munged. */
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register CONST __typeof (env[0]) *e asm ("cx");
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register int v asm ("ax");
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e = env;
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v = val == 0 ? 1 : val;
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#define REG(xx) xx = (long int) e->__##xx
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REGS;
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asm volatile ("jmp %*%0" : : "g" (e->__pc), "a" (v));
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/* NOTREACHED */
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abort ();
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}
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