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.

ChangeLog

@@ -1,3 +1,15 @@
+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.
+
 Wed Aug 30 16:44:55 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
 
 	* sysdeps/mach/hurd/select.c: Deal with out of order replies

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

sysdeps/i386/jmp_buf.h

@@ -1,14 +1,19 @@
 /* Define the machine-dependent type `jmp_buf'.  Intel 386 version.  */
 
-typedef struct
-  {
-    long int __bx, __si, __di;
-    __ptr_t __bp;
-    __ptr_t __sp;
-    __ptr_t __pc;
-  } __jmp_buf[1];
+#if	defined (__USE_MISC) || defined (_ASM)
+#define	JB_BX	0
+#define	JB_SI	1
+#define	JB_DI	2
+#define	JB_BP	3
+#define	JB_SP	4
+#define	JB_PC	5
+#endif
+
+#ifndef	_ASM
+typedef int __jmp_buf[6];
+#endif
 
 /* Test if longjmp to JMPBUF would unwind the frame
    containing a local variable at ADDRESS.  */
 #define _JMPBUF_UNWINDS(jmpbuf, address) \
-  ((__ptr_t) (address) < (jmpbuf)[0].__sp)
+  ((int) (address) < (jmpbuf)[JB_SP])

sysdeps/i386/setjmp.S

@@ -0,0 +1,36 @@
+/* setjmp 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 (__sigsetjmp)
+	movl 4(%esp), %eax	/* User's jmp_buf in %eax.  */
+     	/* Save registers.  */
+	movl %ebx, JB_BX(%eax)
+	movl %esi, JB_SI(%eax)
+	movl %edi, JB_DI(%eax)
+	movl %ebp, JB_BP(%eax)
+	leal 4(%esp), %ecx	/* Save SP as it will be after we return.  */
+     	movl %ecx, JB_SP(%eax)
+	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */
+     	movl %ecx, JB_PC(%eax)
+	xorl %eax, %eax		/* Return zero.  */
+	ret

sysdeps/unix/i386/brk.S

@@ -34,7 +34,16 @@ C_LABEL(__curbrk)
 .text
 SYSCALL__ (brk, 1)
 	movl 4(%esp), %eax
+#ifdef	PIC
+	/* Standard PIC nonsense to store into `__curbrk' through the GOT.  */
+	call here
+here:	popl %ecx
+	addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
+	movl C_SYMBOL_NAME(__curbrk@GOT)(%ecx), %ecx
+	movl %eax, (%ecx)
+#else
 	movl %eax, C_SYMBOL_NAME(__curbrk)
+#endif
 	xorl %eax, %eax
 	ret