Fixup setjmp implementation so it actaully works as expected

 -Erik

1 files changed, 51 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/i386/bsd-_setjmp.S b/libc/sysdeps/linux/i386/bsd-_setjmp.S
new file mode 100644
index 000000000..73d90eb4e
--- /dev/null
+++ b/libc/sysdeps/linux/i386/bsd-_setjmp.S
@@ -0,0 +1,51 @@
+/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'.  i386 version.
+   Copyright (C) 1994,1995,1996,1997,2000,2001 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This just does a tail-call to `__sigsetjmp (ARG, 0)'.
+   We cannot do it in C because it must be a tail-call, so frame-unwinding
+   in setjmp doesn't clobber the state restored by longjmp.  */
+
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.h>
+
+
+.globl _setjmp;
+.type    _setjmp,@function
+.align 4;
+
+_setjmp:
+	xorl %eax, %eax
+	movl 4   (%esp), %edx
+
+     	/* Save registers.  */
+	movl %ebx, (JB_BX*4)(%edx)
+	movl %esi, (JB_SI*4)(%edx)
+	movl %edi, (JB_DI*4)(%edx)
+	leal 4 (%esp), %ecx	/* Save SP as it will be after we return.  */
+     	movl %ecx, (JB_SP*4)(%edx)
+	movl 0 (%esp), %ecx	/* Save PC we are returning to now.  */
+     	movl %ecx, (JB_PC*4)(%edx)
+	movl %ebp, (JB_BP*4)(%edx) /* Save caller's frame pointer.  */
+
+	movl %eax, JB_SIZE(%edx) /* No signal mask set.  */
+	ret
+.size _setjmp,.-_setjmp;
+
+