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authorRoland McGrath <roland@gnu.org>1995-08-31 17:33:01 +0000
committerRoland McGrath <roland@gnu.org>1995-08-31 17:33:01 +0000
commite3726b056b3b1cfde7019e29d5d3c50ce70e08e9 (patch)
tree97695fe42ef6e492efc0d3b728218746d4ccae7e /sysdeps/i386/__longjmp.S
parenta993273c0d4d1907028adee7a2ae012826fd316c (diff)
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Rewrote i386 setjmp in assembly.
Thu Aug 31 13:23:35 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

	* sysdeps/unix/i386/brk.S [PIC]: Set __curbrk through the GOT.

	Rewrote i386 setjmp code in assembly, so as to avoid fighting
	with the compiler for the register values.
	* sysdeps/i386/setjmp.S, sysdeps/i386/__longjmp.S: New files.
	* sysdeps/i386/setjmp.c, sysdeps/i386/__longjmp.c: Files removed.
	* sysdeps/i386/jmp_buf.h [! _ASM] (__jmp_buf): Define as array of ints.
	[__USE_MISC || _ASM] (JB_*): New macros, for indices therein.
	(_JMPBUF_UNWINDS): Use JB_SP.
Diffstat (limited to 'sysdeps/i386/__longjmp.S')
-rw-r--r--sysdeps/i386/__longjmp.S35
1 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/i386/__longjmp.S b/sysdeps/i386/__longjmp.S
new file mode 100644
index 0000000000..f546622828
--- /dev/null
+++ b/sysdeps/i386/__longjmp.S
@@ -0,0 +1,35 @@
+/* longjmp for i386.
+Copyright (C) 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.  */
+
+#include <sysdep.h>
+#define _ASM
+#include <jmp_buf.h>
+
+ENTRY (__longjmp)
+	movl 4(%esp), %ecx	/* User's jmp_buf in %ecx.  */
+	movl 8(%esp), %eax	/* Second argument is return value.  */
+     	/* Restore registers.  */
+	movl JB_BX(%ecx), %ebx
+	movl JB_SI(%ecx), %esi
+	movl JB_DI(%ecx), %edi
+	movl JB_BP(%ecx), %ebp
+	movl JB_SP(%ecx), %esp
+	/* Jump to saved PC.  */
+     	movl JB_PC(%ecx), %ecx
+     	jmp *%ecx