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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
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')
-rw-r--r--sysdeps/i386/__longjmp.S35
-rw-r--r--sysdeps/i386/__longjmp.c66
-rw-r--r--sysdeps/i386/jmp_buf.h21
-rw-r--r--sysdeps/i386/setjmp.S36
-rw-r--r--sysdeps/i386/setjmp.c55
-rw-r--r--sysdeps/unix/i386/brk.S9
6 files changed, 93 insertions, 129 deletions
diff --git a/sysdeps/i386/__longjmp.S b/sysdeps/i386/__longjmp.S
new file mode 100644
index 0000000..f546622
--- /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
diff --git a/sysdeps/i386/__longjmp.c b/sysdeps/i386/__longjmp.c
deleted file mode 100644
index 65d6ec1..0000000
--- a/sysdeps/i386/__longjmp.c
+++ /dev/null
@@ -1,66 +0,0 @@
-/* Copyright (C) 1991, 1992, 1994, 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. */
-
-#ifndef __GNUC__
- #error This file uses GNU C extensions; you must compile with GCC.
-#endif
-
-/* Put these global register declarations first, because we get an error if
- they come after any function definition, including inlines which might
- be in some header. */
-
-#define REGS \
- REG (bx);\
- REG (si);\
- REG (di);\
- REG (bp);\
- REG (sp)
-
-#define REG(xx) register long int xx asm (#xx)
-REGS;
-#undef REG
-
-#include <ansidecl.h>
-#include <errno.h>
-#include <setjmp.h>
-#include <stdlib.h>
-
-/* Jump to the position specified by ENV, causing the
- setjmp call there to return VAL, or 1 if VAL is 0. */
-void
-DEFUN(__longjmp, (env, val),
- __jmp_buf env AND int val)
-{
- /* We specify explicit registers because, when not optimizing,
- the compiler will generate code that uses the frame pointer
- after it's been munged. */
-
- register CONST __typeof (env[0]) *e asm ("cx");
- register int v asm ("ax");
-
- e = env;
- v = val == 0 ? 1 : val;
-
-#define REG(xx) xx = (long int) e->__##xx
- REGS;
-
- asm volatile ("jmp %*%0" : : "g" (e->__pc), "a" (v));
-
- /* NOTREACHED */
- abort ();
-}
diff --git a/sysdeps/i386/jmp_buf.h b/sysdeps/i386/jmp_buf.h
index 7949883..0c03073 100644
--- a/sysdeps/i386/jmp_buf.h
+++ b/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])
diff --git a/sysdeps/i386/setjmp.S b/sysdeps/i386/setjmp.S
new file mode 100644
index 0000000..a07d6f1
--- /dev/null
+++ b/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
diff --git a/sysdeps/i386/setjmp.c b/sysdeps/i386/setjmp.c
deleted file mode 100644
index fb8fc98..0000000
--- a/sysdeps/i386/setjmp.c
+++ /dev/null
@@ -1,55 +0,0 @@
-/* Copyright (C) 1991, 1992, 1994 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. */
-
-/* Put these global register declarations first, because we get an error if
- they come after any function definition, including inlines which might
- be in some header. */
-
-#define REGS \
- REG (bx);\
- REG (si);\
- REG (di)
-
-#define REG(xx) register long int xx asm (#xx)
-REGS;
-#undef REG
-
-#include <errno.h>
-#include <setjmp.h>
-
-/* Save the current program position in ENV and return 0. */
-int
-__sigsetjmp (jmp_buf env, int savemask)
-{
- /* Save the general registers. */
-#define REG(xx) env[0].__jmpbuf[0].__##xx = xx
- REGS;
-#undef REG
-
- /* Save the return PC. */
- env[0].__jmpbuf[0].__pc = ((void **) &env)[-1];
-
- /* Save caller's FP, not our own. */
- env[0].__jmpbuf[0].__bp = ((void **) &env)[-2];
-
- /* Save caller's SP, not our own. */
- env[0].__jmpbuf[0].__sp = (void *) &env;
-
- /* Save the signal mask if requested. */
- return __sigjmp_save (env, savemask);
-}
diff --git a/sysdeps/unix/i386/brk.S b/sysdeps/unix/i386/brk.S
index f55ac7c..f1717bb 100644
--- a/sysdeps/unix/i386/brk.S
+++ b/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