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/* $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 <machine/asm.h>
#include <sys/syscall.h>
#include <SYS.h>
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
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