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-rw-r--r--libc/sysdeps/linux/i386/setjmp.S145
1 files changed, 58 insertions, 87 deletions
diff --git a/libc/sysdeps/linux/i386/setjmp.S b/libc/sysdeps/linux/i386/setjmp.S
index 3ff05425f..d6f2cba8b 100644
--- a/libc/sysdeps/linux/i386/setjmp.S
+++ b/libc/sysdeps/linux/i386/setjmp.S
@@ -1,88 +1,59 @@
-/* These are predefined by new versions of GNU cpp. */
-
-#ifndef __USER_LABEL_PREFIX__
-#define __USER_LABEL_PREFIX__ _
-#endif
-
-#ifndef __REGISTER_PREFIX__
-#define __REGISTER_PREFIX__
-#endif
-
-/* ANSI concatenation macros. */
-
-#define CONCAT1(a, b) CONCAT2(a, b)
-#define CONCAT2(a, b) a ## b
-
-/* Use the right prefix for global labels. */
-
-#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
-
-/* Use the right prefix for registers. */
-
-#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x)
-
-#define d0 REG (d0)
-#define d1 REG (d1)
-#define d2 REG (d2)
-#define d3 REG (d3)
-#define d4 REG (d4)
-#define d5 REG (d5)
-#define d6 REG (d6)
-#define d7 REG (d7)
-#define a0 REG (a0)
-#define a1 REG (a1)
-#define a2 REG (a2)
-#define a3 REG (a3)
-#define a4 REG (a4)
-#define a5 REG (a5)
-#define a6 REG (a6)
-#define fp REG (fp)
-#define sp REG (sp)
-
-.global SYM (setjmp)
-.global SYM (longjmp)
-
-SYM (setjmp):
- moveal sp@(4),a0
- movel sp@(0),a0@(12)
- movel sp,a0@(8)
- moveml d2-d7/a2-a6,a0@(20)
- clrl d0
- rts
-
-SYM (longjmp):
- moveal sp@(4),a0
- movel sp@(8),d0
- bne 1f
- movel #1,d0
-1:
- moveml a0@(20),d2-d7/a2-a6
- moveal a0@(8),sp
- movel a0@(12),sp@
- rts
-
-#ifdef M68881
-.global SYM (setjmp_68881)
-.global SYM (longjmp_68881)
-
-SYM (setjmp_68881):
- moveal sp@(4),a0
- movel sp@(0),a0@(12)
- movel sp,a0@(8)
- moveml d2-d7/a2-a6,a0@(20)
- fmovemx fp2-fp7,a0@(64)
- clrl d0
- rts
-
-SYM (longjmp_68881):
- moveal sp@(4),a0
- fmovemx a0@(64),fp2-fp7
- movel sp@(8),d0
- bne 1f
- movel #1,d0
-1:
- moveml a0@(20),d2-d7/a2-a6
- moveal a0@(8),sp
- movel a0@(12),sp@
- rts
+/* setjmp for i386.
+ Copyright (C) 1995, 1996, 1997 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+#define _ASM
+#define _SETJMP_H
+#include <machine/setjmp.h>
+
+ENTRY (__setjmp)
+ popl %eax /* Pop return address. */
+ popl %ecx /* Pop jmp_buf. */
+ pushl $0 /* Push zero argument. */
+ pushl %ecx /* Push jmp_buf. */
+ pushl %eax /* Push back return address. */
+
+ENTRY (__sigsetjmp)
+ movl 4(%esp), %eax /* User's jmp_buf in %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)
+
+ /* Make a tail call to __sigjmp_save; it takes the same args. */
+#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 L(here)
+L(here):
+ popl %ecx
+ addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx
+ movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx
+ jmp *%ecx
+#else
+ jmp __sigjmp_save
#endif
+.size __sigsetjmp,.-__sigsetjmp;