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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.
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Roland McGrath
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12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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Thu Aug 31 13:23:35 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
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* sysdeps/unix/i386/brk.S [PIC]: Set __curbrk through the GOT.
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Rewrote i386 setjmp code in assembly, so as to avoid fighting
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with the compiler for the register values.
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* sysdeps/i386/setjmp.S, sysdeps/i386/__longjmp.S: New files.
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* sysdeps/i386/setjmp.c, sysdeps/i386/__longjmp.c: Files removed.
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* sysdeps/i386/jmp_buf.h [! _ASM] (__jmp_buf): Define as array of ints.
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[__USE_MISC || _ASM] (JB_*): New macros, for indices therein.
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(_JMPBUF_UNWINDS): Use JB_SP.
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Wed Aug 30 16:44:55 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
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* sysdeps/mach/hurd/select.c: Deal with out of order replies
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35
sysdeps/i386/__longjmp.S
Normal file
35
sysdeps/i386/__longjmp.S
Normal file
@ -0,0 +1,35 @@
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/* longjmp for i386.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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#define _ASM
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#include <jmp_buf.h>
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ENTRY (__longjmp)
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movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
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movl 8(%esp), %eax /* Second argument is return value. */
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/* Restore registers. */
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movl JB_BX(%ecx), %ebx
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movl JB_SI(%ecx), %esi
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movl JB_DI(%ecx), %edi
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movl JB_BP(%ecx), %ebp
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movl JB_SP(%ecx), %esp
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/* Jump to saved PC. */
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movl JB_PC(%ecx), %ecx
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jmp *%ecx
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@ -1,66 +0,0 @@
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/* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef __GNUC__
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#error This file uses GNU C extensions; you must compile with GCC.
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#endif
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/* Put these global register declarations first, because we get an error if
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they come after any function definition, including inlines which might
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be in some header. */
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#define REGS \
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REG (bx);\
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REG (si);\
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REG (di);\
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REG (bp);\
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REG (sp)
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#define REG(xx) register long int xx asm (#xx)
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REGS;
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#undef REG
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#include <ansidecl.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <stdlib.h>
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/* Jump to the position specified by ENV, causing the
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setjmp call there to return VAL, or 1 if VAL is 0. */
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void
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DEFUN(__longjmp, (env, val),
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__jmp_buf env AND int val)
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{
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/* We specify explicit registers because, when not optimizing,
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the compiler will generate code that uses the frame pointer
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after it's been munged. */
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register CONST __typeof (env[0]) *e asm ("cx");
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register int v asm ("ax");
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e = env;
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v = val == 0 ? 1 : val;
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#define REG(xx) xx = (long int) e->__##xx
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REGS;
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asm volatile ("jmp %*%0" : : "g" (e->__pc), "a" (v));
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/* NOTREACHED */
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abort ();
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}
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@ -1,14 +1,19 @@
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/* Define the machine-dependent type `jmp_buf'. Intel 386 version. */
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typedef struct
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{
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long int __bx, __si, __di;
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__ptr_t __bp;
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__ptr_t __sp;
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__ptr_t __pc;
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} __jmp_buf[1];
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#if defined (__USE_MISC) || defined (_ASM)
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#define JB_BX 0
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#define JB_SI 1
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#define JB_DI 2
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#define JB_BP 3
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#define JB_SP 4
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#define JB_PC 5
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#endif
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#ifndef _ASM
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typedef int __jmp_buf[6];
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#endif
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/* Test if longjmp to JMPBUF would unwind the frame
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containing a local variable at ADDRESS. */
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#define _JMPBUF_UNWINDS(jmpbuf, address) \
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((__ptr_t) (address) < (jmpbuf)[0].__sp)
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((int) (address) < (jmpbuf)[JB_SP])
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36
sysdeps/i386/setjmp.S
Normal file
36
sysdeps/i386/setjmp.S
Normal file
@ -0,0 +1,36 @@
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/* setjmp for i386.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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#define _ASM
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#include <jmp_buf.h>
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ENTRY (__sigsetjmp)
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movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save registers. */
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movl %ebx, JB_BX(%eax)
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movl %esi, JB_SI(%eax)
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movl %edi, JB_DI(%eax)
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movl %ebp, JB_BP(%eax)
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leal 4(%esp), %ecx /* Save SP as it will be after we return. */
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movl %ecx, JB_SP(%eax)
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movl 0(%esp), %ecx /* Save PC we are returning to now. */
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movl %ecx, JB_PC(%eax)
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xorl %eax, %eax /* Return zero. */
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ret
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@ -1,55 +0,0 @@
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/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* Put these global register declarations first, because we get an error if
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they come after any function definition, including inlines which might
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be in some header. */
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#define REGS \
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REG (bx);\
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REG (si);\
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REG (di)
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#define REG(xx) register long int xx asm (#xx)
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REGS;
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#undef REG
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#include <errno.h>
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#include <setjmp.h>
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/* Save the current program position in ENV and return 0. */
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int
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__sigsetjmp (jmp_buf env, int savemask)
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{
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/* Save the general registers. */
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#define REG(xx) env[0].__jmpbuf[0].__##xx = xx
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REGS;
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#undef REG
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/* Save the return PC. */
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env[0].__jmpbuf[0].__pc = ((void **) &env)[-1];
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/* Save caller's FP, not our own. */
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env[0].__jmpbuf[0].__bp = ((void **) &env)[-2];
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/* Save caller's SP, not our own. */
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env[0].__jmpbuf[0].__sp = (void *) &env;
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/* Save the signal mask if requested. */
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return __sigjmp_save (env, savemask);
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}
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@ -34,7 +34,16 @@ C_LABEL(__curbrk)
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.text
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SYSCALL__ (brk, 1)
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movl 4(%esp), %eax
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#ifdef PIC
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/* Standard PIC nonsense to store into `__curbrk' through the GOT. */
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call here
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here: popl %ecx
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addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
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movl C_SYMBOL_NAME(__curbrk@GOT)(%ecx), %ecx
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movl %eax, (%ecx)
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#else
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movl %eax, C_SYMBOL_NAME(__curbrk)
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#endif
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xorl %eax, %eax
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ret
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