/* $OpenBSD: ldasm.S,v 1.11 2009/02/16 14:17:51 kurt Exp $ */ /* * Copyright (c) 2002 Dale Rahn * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 DL_DATA_SIZE (16*4) #include #include .text .align 4 .globl _dl_start .type _dl_start,@function _dl_start: movl %esp,%eax # save stack pointer for _rtld pushl %ebx # save ps_strings subl $DL_DATA_SIZE,%esp # allocate dl_data pushl $0 # push 0 for dynamicp (unused on i386) movl %esp,%ebx movl %ebx,%edi # save dl_data arg for dl_boot pushl %ebx # push dl_data for dl_boot_bind mov %eax, %esi # save stack for dl_boot pushl %eax # load saved SP for dl_boot_bind call _dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data) pushl %edi # push saved dl_data movl %edi,%ebp movl (7*4)(%ebp),%eax pushl %eax # push loff from dl_data movl %esi,%ebp movl $4,%eax imull 0(%ebp),%eax addl $8,%eax addl %ebp,%eax push %eax # push envp leal 4(%ebp),%eax push %eax # push argv call _dl_boot@PLT # _dl_boot(argv,envp,loff,dl_data) addl $7*4,%esp # pop args addl $DL_DATA_SIZE,%esp # return dl_data popl %ebx # %ebx = ps_strings movl $0,%edx # %edx = cleanup - XXXDSR movl $0,%ecx # %ecx = obj_main - XXXDSR jmp *%eax /* copied from lib/libc/arch/i386/SYS.h - XXX */ #define __DO_SYSCALL(x) \ movl $__CONCAT(SYS_, x),%eax; \ int $0x80 #define DL_SYSCALL(n) DL_SYSCALL2(n,n) #define DL_SYSCALL2(n,c) \ .section ".text" ;\ .align 4 ;\ .global __CONCAT(_dl_,n) ;\ .type __CONCAT(_dl_,n)%function ;\ __CONCAT(_dl_,n): ;\ __DO_SYSCALL(c) ;\ jb .L_cerr ;\ ret DL_SYSCALL(close) .section ".text" .align 4 .global _dl_exit .type _dl_exit,@function _dl_exit: mov $SYS_exit, %eax int $0x80 ret DL_SYSCALL(issetugid) DL_SYSCALL2(_syscall,__syscall) DL_SYSCALL(munmap) DL_SYSCALL(mprotect) DL_SYSCALL(open) DL_SYSCALL(read) DL_SYSCALL(write) DL_SYSCALL(stat) DL_SYSCALL(fstat) DL_SYSCALL(fcntl) DL_SYSCALL(gettimeofday) DL_SYSCALL2(sysctl,__sysctl) DL_SYSCALL(getdirentries) .L_cerr: /* error: result = -errno; - handled here. */ neg %eax ret /* _dl_sigprocmask: does not handle NULL new set */ .section ".text" .align 4 .global _dl_sigprocmask .type _dl_sigprocmask,@function _dl_sigprocmask: movl 8(%esp), %ecx movl (%ecx),%ecx movl %ecx,8(%esp) # to new mask arg mov $SYS_sigprocmask, %eax int $0x80 jb 1f /* error: result = -errno */ movl 12(%esp),%ecx # fetch old mask requested testl %ecx,%ecx # test if old mask requested jz 2f movl %eax,(%ecx) # store old mask xorl %eax,%eax 2: ret 1: /* error: result = -errno; - handled here. */ neg %eax ret .align 4 .global _dl_bind_start .type _dl_bind_start,@function _dl_bind_start: pushf # save registers pushl %eax pushl %ecx pushl %edx pushl %ebx pushl %ebp pushl %esi pushl %edi pushl %ds pushl %es pushl 44(%esp) # Copy of reloff pushl 44(%esp) # Copy of obj call _dl_bind@PLT # Call the binder addl $8,%esp # pop binder args movl %eax,44(%esp) # Store function to be called in obj popl %es # restore registers popl %ds popl %edi popl %esi popl %ebp popl %ebx popl %edx popl %ecx popl %eax popf leal 4(%esp),%esp # Discard reloff, do not change eflags ret