Fixup setjmp implementation so it actaully works as expected

 -Erik

4 files changed, 146 insertions, 47 deletions

diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile
index a54685726..67dd89ebf 100644
--- a/libc/sysdeps/linux/i386/Makefile
+++ b/libc/sysdeps/linux/i386/Makefile
@@ -36,7 +36,7 @@ CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0))
 endif
 
 
-SSRC=__longjmp.S setjmp.S vfork.S clone.S
+SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S bsd-_setjmp.S
 ifeq ($(UNIFIED_SYSCALL),true)
 	SSRC += __uClibc_syscall.S
 endif
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;
+
+
diff --git a/libc/sysdeps/linux/i386/bsd-setjmp.S b/libc/sysdeps/linux/i386/bsd-setjmp.S
new file mode 100644
index 000000000..93ae2ea8d
--- /dev/null
+++ b/libc/sysdeps/linux/i386/bsd-setjmp.S
@@ -0,0 +1,61 @@
+/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'.  i386 version.
+   Copyright (C) 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.  */
+
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.h>
+
+.globl setjmp;
+.type    setjmp,@function
+.align 4;
+setjmp:
+        movl 4   (%esp), %eax
+	/* Save registers.  */
+        movl %ebx, (0 *4)(%eax)
+        movl %esi, (1 *4)(%eax)
+        movl %edi, (2 *4)(%eax)
+	/* Save SP as it will be after we return.  */
+        leal 4   (%esp), %ecx
+        movl %ecx, (4 *4)(%eax)
+	/* Save PC we are returning to now.  */
+        movl 0 (%esp), %ecx
+        movl %ecx, (5 *4)(%eax)
+	/* Save caller's frame pointer.  */
+        movl %ebp, (3 *4)(%eax)  
+
+	/* Call __sigjmp_save.  */
+	pushl $1
+	pushl 8(%esp)
+#ifdef	PIC
+	/* We cannot use the PLT, because it requires that %ebx be set, but
+           we can't save and restore our caller's value.  Instead, we do an
+           indirect jump through the GOT, using for the temporary register
+           %ecx, which is call-clobbered.  */
+	call here2
+here2:	popl %ecx
+	addl $_GLOBAL_OFFSET_TABLE_+[.-here2], %ecx
+	movl    __sigjmp_save    @GOT  (%ecx), %ecx
+	call *%ecx
+#else
+	call __sigjmp_save
+#endif
+	popl %ecx
+	popl %edx
+	ret
+.size setjmp,.-setjmp;
diff --git a/libc/sysdeps/linux/i386/setjmp.S b/libc/sysdeps/linux/i386/setjmp.S
index d38437b6b..debef7017 100644
--- a/libc/sysdeps/linux/i386/setjmp.S
+++ b/libc/sysdeps/linux/i386/setjmp.S
@@ -1,72 +1,59 @@
-/* setjmp for i386.
-   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+/* setjmp for i386, ELF version.
+   Copyright (C) 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   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
-   Library General Public License for more details.
+   Lesser 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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   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.  */
 
 #define _ASM
 #define _SETJMP_H
 #include <bits/setjmp.h>
 
+
 .globl __sigsetjmp;
-.type	 __sigsetjmp,@function
-.align 4;                                                               \
+.type    __sigsetjmp,@function
+.align 4;
+
 __sigsetjmp:
-	movl 4(%esp), %eax	/* User's jmp_buf in %eax.  */
+        movl 4   (%esp), %eax
      	/* Save registers.  */
-	movl %ebx, (JB_BX*4)(%eax)
-	movl %esi, (JB_SI*4)(%eax)
-	movl %edi, (JB_DI*4)(%eax)
-	movl %ebp, (JB_BP*4)(%eax)
-	leal 4(%esp), %ecx	/* Save SP as it will be after we return.  */
-     	movl %ecx, (JB_SP*4)(%eax)
-	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */
-     	movl %ecx, (JB_PC*4)(%eax)
-
-	pushl 0x8(%esp) /* save mask */
-	pushl 0x8(%esp) /* jump buf */
+        movl %ebx, (0 *4)(%eax)
+        movl %esi, (1 *4)(%eax)
+        movl %edi, (2 *4)(%eax)
+	/* Save SP as it will be after we return.  */
+        leal 4(%esp), %ecx       
+        movl %ecx, (4 *4)(%eax)
+	/* Save PC we are returning to now.  */
+        movl 0(%esp), %ecx       
+        movl %ecx, (5 *4)(%eax)
+	/* Save caller's frame pointer.  */
+        movl %ebp, (3 *4)(%eax)  
 
 	/* Make a tail call to __sigjmp_save; it takes the same args.  */
-#if defined(PIC)
+#ifdef	PIC
 	/* We cannot use the PLT, because it requires that %ebx be set, but
            we can't save and restore our caller's value.  Instead, we do an
            indirect jump through the GOT, using for the temporary register
            %ecx, which is call-clobbered.  */
-	call Lhere
-Lhere:
+	call .Lhere
+.Lhere:
 	popl %ecx
-	addl $_GLOBAL_OFFSET_TABLE_+[.-Lhere], %ecx
-	movl (__sigjmp_save)(%ecx), %ecx
-	call *%ecx
+	addl $_GLOBAL_OFFSET_TABLE_+[.- .Lhere  ], %ecx
+	movl    __sigjmp_save    @GOT  (%ecx), %ecx
+	jmp *%ecx
 #else
-	call __sigjmp_save
+	jmp   __sigjmp_save
 #endif
-
-	add  $8, %esp
-	ret
 .size __sigsetjmp,.-__sigsetjmp;
-
-.globl _setjmp;
-.type	 _setjmp,@function
-.align 4;                                                               \
-_setjmp:
-	pushl $0		/* Push zero argument.  */
-	pushl 0x8(%esp)	/* Push jmp_buf.  */
-	call  __sigsetjmp
-	add  $8, %esp
-	ret
-.size _setjmp,.-_setjmp;
-