1997-08-03 05:00:51 +08:00
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/* setjmp for i386, ELF version.
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2000-06-01 15:14:15 +08:00
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Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
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1997-08-03 05:00:51 +08:00
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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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#define _ASM
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1997-11-26 12:23:08 +08:00
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#define _SETJMP_H
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1997-08-03 05:00:51 +08:00
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#include <bits/setjmp.h>
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2000-06-09 14:14:39 +08:00
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#include "bp-asm.h"
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#define PARMS LINKAGE /* no space for saved regs */
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#define JBUF PARMS
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#define SGMSK JBUF+PRT_SIZE
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1997-08-03 05:00:51 +08:00
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/* We include the BSD entry points here as well but we make
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them weak. */
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ENTRY (setjmp)
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.weak C_SYMBOL_NAME (setjmp)
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popl %eax /* Pop return PC. */
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popl %ecx /* Pop jmp_buf argument. */
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pushl $1 /* Push second argument of zero. */
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pushl %ecx /* Push back first argument. */
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pushl %eax /* Push back return PC. */
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2000-06-01 15:14:15 +08:00
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/* Note that we have to use a non-exported symbol in the next
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jump since otherwise gas will emit it as a jump through the
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PLT which is what we cannot use here. */
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jmp .Linternal_sigsetjmp
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1997-08-03 05:00:51 +08:00
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END (setjmp)
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/* Binary compatibility entry point. */
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ENTRY (_setjmp)
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.weak C_SYMBOL_NAME (_setjmp)
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ENTRY (__setjmp)
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popl %eax /* Pop return address. */
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popl %ecx /* Pop jmp_buf. */
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pushl $0 /* Push zero argument. */
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pushl %ecx /* Push jmp_buf. */
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pushl %eax /* Push back return address. */
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ENTRY (__sigsetjmp)
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2000-06-01 15:14:15 +08:00
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.Linternal_sigsetjmp = __sigsetjmp
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1997-08-03 05:00:51 +08:00
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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*4)(%eax)
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movl %esi, (JB_SI*4)(%eax)
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movl %edi, (JB_DI*4)(%eax)
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movl %ebp, (JB_BP*4)(%eax)
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2000-06-09 14:14:39 +08:00
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leal JBUF(%esp), %ecx /* Save SP as it will be after we return. */
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1997-08-03 05:00:51 +08:00
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movl %ecx, (JB_SP*4)(%eax)
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movl 0(%esp), %ecx /* Save PC we are returning to now. */
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movl %ecx, (JB_PC*4)(%eax)
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/* Make a tail call to __sigjmp_save; it takes the same args. */
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#ifdef PIC
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/* We cannot use the PLT, because it requires that %ebx be set, but
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we can't save and restore our caller's value. Instead, we do an
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indirect jump through the GOT, using for the temporary register
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%ecx, which is call-clobbered. */
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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(__sigjmp_save@GOT)(%ecx), %ecx
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jmp *%ecx
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#else
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jmp __sigjmp_save
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#endif
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END (__sigsetjmp)
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