IABSD.fr/src/lib/csu/i386

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• Author : deraadt
  Date : 2023-11-18 16:26:15
  Hash : 1e43641e
  Message : crt0 uses a helper function in a MD src/libexec/ld.so .h file (rather than reproducing the relevant defines and code in a different place) to perform minor relocations. If things go very wrong, it would call _dl_exit() -- a locally defined crt0 function which is syscall exit(2). We don't need to call exit(2) for this obscure case which doesn't happen and provides no debugging information. An 'abort' is going to provide better information. So let's change the function name to _dso_abort() and make it a single illegal instruction. ok guenther

• md_init.h

• /* $OpenBSD: md_init.h,v 1.13 2023/11/18 16:26:16 deraadt Exp $ */
  
  /*-
   * Copyright (c) 2001 Ross Harvey
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by the NetBSD
   *      Foundation, Inc. and its contributors.
   * 4. Neither the name of The NetBSD Foundation nor the names of its
   *    contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #define MD_SECT_CALL_FUNC(section, func) \
  	__asm (".section "#section", \"ax\"\n"	\
  	"	call " #func "\n"		\
  	"	.previous")
  
  #define MD_SECTION_PROLOGUE(sect, entry_pt)	\
  	__asm (					\
  	".section "#sect",\"ax\",@progbits	\n" \
  	"	.globl " #entry_pt "		\n" \
  	"	.type " #entry_pt ",@function	\n" \
  	"	.align 16			\n" \
  	#entry_pt":				\n" \
  	"	pushl	%ebp			\n" \
  	"	movl	%esp,%ebp		\n" \
  	"	andl	$~15,%esp		\n" \
  	"	.previous")
  
  
  #define MD_SECTION_EPILOGUE(sect)		\
  	__asm (					\
  	".section "#sect",\"ax\",@progbits	\n" \
  	"	leave				\n" \
  	"	ret				\n" \
  	"	.previous")
  
  
  #define	MD_CRT0_START				\
  	__asm(					\
  	".text					\n" \
  	"	.align	4			\n" \
  	"	.globl	__start			\n" \
  	"	.globl	_start			\n" \
  	"_start:				\n" \
  	"__start:				\n" \
  	"	movl	%esp,%ebp		\n" \
  	"	andl	$~15,%esp	# align stack\n" \
  	"	pushl	%edx		# cleanup\n" \
  	"	movl	0(%ebp),%eax		\n" \
  	"	leal	8(%ebp,%eax,4),%ecx	\n" \
  	"	leal	4(%ebp),%edx		\n" \
  	"	pushl	%ecx			\n" \
  	"	pushl	%edx			\n" \
  	"	pushl	%eax			\n" \
  	"	xorl	%ebp,%ebp	# mark deepest stack frame\n" \
  	"	call	___start		\n" \
  	"	.previous")
  
  #define	MD_RCRT0_START				\
  	__asm(					\
  	".text					\n" \
  	"	.align	4			\n" \
  	"	.globl	__start			\n" \
  	"	.globl	_start			\n" \
  	"_start:				\n" \
  	"__start:				\n" \
  	"	movl	%esp,%eax	# save SP for dl_boot_bind \n" \
  	"	subl	$16*4,%esp 	# allocate dl_data \n" \
  	"	call	1f		# push &_DYNAMIC... \n" \
  	"1:	addl	$(_DYNAMIC-1b),(%esp)	# ...for dl_boot_bind \n" \
  	"	movl	%esp,%ebx		\n" \
  	"	pushl	%ebx		# push dl_data for dl_boot_bind \n" \
  	"					\n" \
  	"	mov	%eax, %esi	# save stack for ___start \n" \
  	"	pushl	%eax		# push saved SP for dl_boot_bind \n" \
  	"					\n" \
  	"	call	_dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data,0) \n" \
  	"	addl	$3*4,%esp	# pop args \n" \
  	"					\n" \
  	"	movl	%esi,%ebp		\n" \
  	"	andl	$~15,%esp	# align stack\n" \
  	"	pushl	$0		# cleanup\n" \
  	"	movl	0(%ebp),%eax	# argc	\n" \
  	"	leal	8(%ebp,%eax,4),%ecx #envp \n" \
  	"	leal	4(%ebp),%edx	# argv	\n" \
  	"	pushl	%ecx			\n" \
  	"	pushl	%edx			\n" \
  	"	pushl	%eax			\n" \
  	"	xorl	%ebp,%ebp	# mark deepest stack frame\n" \
  	"	call	___start	# ___start(argc,argv,envp,0) \n" \
  	"					\n" \
  	"	.align	4			\n" \
  	"	.globl	_csu_abort		\n" \
  	"	.type	_csu_abort,@function	\n" \
  	"_csu_abort:				\n" \
  	"	int3				\n" \
  	"	.previous")