From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/i386/__longjmp.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 sysdeps/i386/__longjmp.c (limited to 'sysdeps/i386/__longjmp.c') diff --git a/sysdeps/i386/__longjmp.c b/sysdeps/i386/__longjmp.c new file mode 100644 index 0000000000..65d6ec18ec --- /dev/null +++ b/sysdeps/i386/__longjmp.c @@ -0,0 +1,66 @@ +/* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#ifndef __GNUC__ + #error This file uses GNU C extensions; you must compile with GCC. +#endif + +/* Put these global register declarations first, because we get an error if + they come after any function definition, including inlines which might + be in some header. */ + +#define REGS \ + REG (bx);\ + REG (si);\ + REG (di);\ + REG (bp);\ + REG (sp) + +#define REG(xx) register long int xx asm (#xx) +REGS; +#undef REG + +#include +#include +#include +#include + +/* Jump to the position specified by ENV, causing the + setjmp call there to return VAL, or 1 if VAL is 0. */ +void +DEFUN(__longjmp, (env, val), + __jmp_buf env AND int val) +{ + /* We specify explicit registers because, when not optimizing, + the compiler will generate code that uses the frame pointer + after it's been munged. */ + + register CONST __typeof (env[0]) *e asm ("cx"); + register int v asm ("ax"); + + e = env; + v = val == 0 ? 1 : val; + +#define REG(xx) xx = (long int) e->__##xx + REGS; + + asm volatile ("jmp %*%0" : : "g" (e->__pc), "a" (v)); + + /* NOTREACHED */ + abort (); +} -- cgit v1.2.3