/* $OpenBSD: ldasm.S,v 1.24 2016/08/28 06:15:32 guenther Exp $ */ /* * Copyright (c) 2004 Dale Rahn * * 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) /* XXX */ #include #include #include ENTRY(_dl_start) mov fp, sp mov r5, sp mov lr, r6 @ save lr sub sp, sp, #4+4+DL_DATA_SIZE add r7, sp, #4 @ dl_data mov r0, fp @ original stack mov r1, r7 @ dl_data ldr r8, .L_GOT @ calculate address of GOT... 1: add r8, pc, r8 @ into r8 ldr r2, .L__DYNAMIC @ &_DYNAMIC add r2, r2, r8 bl _dl_boot_bind add r0, r5, #4 @ argv ldr r1, [r5, #0x0] @ envp add r1, r1, #2 add r1, fp, r1, lsl #2 ldr r2, [r7, #7*4] @ loff from dl_data mov r3, r7 @ dl_data bl _dl_boot mov sp, fp mov fp, #0 mov lr, r6 mov r1, r0 ldr r0, .L_dl_dtors add r0, r0, r8 mov pc, r1 .L_GOT: .long _GLOBAL_OFFSET_TABLE_-(1b+8) .L__DYNAMIC: .long _DYNAMIC(GOTOFF) .L_dl_dtors: .long _dl_dtors(GOTOFF) ENTRY(_dl_bind_start) /* * ip is pointer to got entry for this relocation * lr is pointer to pltgot[2], which is entry -1 of got plt reloc. * return address is on stack */ stmdb sp!, {r0-r4,sl,fp} sub r1, ip, lr /* r1 = 4 * (n + 1) */ sub r1, r1, #4 /* r1 = 4 * n */ mov r1, r1, lsr #2 /* r1 = n */ ldr r0, [lr, #-4] bl _dl_bind mov ip, r0 ldmia sp!, {r0-r4,sl,fp,lr} mov pc, ip /* STUB */ /* ld.so SYSCALLS */ #define DL_SYSCALL(n) DL_SYSCALL2(n,n) #define DL_SYSCALL2(n,c) \ .global __CONCAT(_dl_,n) ;\ .type __CONCAT(_dl_,n)%function ;\ __CONCAT(_dl_,n): ;\ SYSTRAP(c) ;\ bcs .L_cerr ;\ mov pc, lr .section ".text" .align 4 DL_SYSCALL(close) .global _dl_exit .type _dl_exit%function _dl_exit: SYSTRAP(exit) 1: b 1b DL_SYSCALL(issetugid) DL_SYSCALL(getthrid) DL_SYSCALL2(_syscall,__syscall) DL_SYSCALL(munmap) DL_SYSCALL(mprotect) DL_SYSCALL(open) DL_SYSCALL(read) DL_SYSCALL(write) DL_SYSCALL(fstat) DL_SYSCALL(readlink) DL_SYSCALL(utrace) DL_SYSCALL(getentropy) DL_SYSCALL(sendsyslog) DL_SYSCALL(pledge) DL_SYSCALL2(getcwd,__getcwd) DL_SYSCALL(sysctl) DL_SYSCALL2(set_tcb,__set_tcb) DL_SYSCALL(getdents) .L_cerr: rsb r0, r0, #0 /* r0 = -errno */ mov pc, lr