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/* $OpenBSD: ldasm.S,v 1.30 2017/08/28 14:06:22 deraadt Exp $ */
/*
* Copyright (c) 2006 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>
ENTRY(_dl_start)
mov r15, r12 // save for later
mov r15, r4 // sp
add #-(4+4+DL_DATA_SIZE), r15
mov r15, r5 // dl_data
bsr 1f
nop
1:
.L_offbase:
sts pr, r0
mov.l .L_dynamic, r6
add r0, r6 // DYNAMIC
mov.l .L_boot_bind, r0
bsrf r0 // boot_bind(sp, dl_data, DYNAMIC)
nop
.L_call_boot_bind:
mov r12, r4
add #4, r4 // argv
mov.l @r12, r5
add #2, r5
shll2 r5
add r12, r5 // envp
mov r15, r7 // dl_data
mov r7, r6
add #(7*4), r6
mov.l @r6, r6 // dl_data[AUX_base] == loff
mov.l .L_boot, r0
bsrf r0 // _dl_boot(argv, envp, loff, dl_data)
nop
.L_call_boot:
mov r12, r15
mov.l @r15, r4 // argc
mov r15, r5
add #4, r5 // argv
mov r4, r6
add #1, r6
shll2 r6
add r5, r6 // envp
mov r0, r12
mova .L_GOT, r0
mov.l .L_GOT, r7
add r7, r0 // GOT
mov.l .L_dl_dtors, r7
jmp @r12
mov.l @(r0,r7), r7 // cleanup
.align 2
.L_boot_bind:
.long _dl_boot_bind-.L_call_boot_bind
.L_boot:
.long _dl_boot-.L_call_boot
.L_dynamic:
.long _DYNAMIC-.L_offbase
.L_GOT:
.long _GLOBAL_OFFSET_TABLE_
.L_dl_dtors:
.long _dl_dtors@GOT
.size _dl_start, .-dl_start
/*
* r0 - obj
* r1 - reloff
*/
ENTRY(_dl_bind_start)
mov.l r2, @-r15
mov.l r3, @-r15
mov.l r4, @-r15
mov.l r5, @-r15
mov.l r6, @-r15
mov.l r7, @-r15
sts.l pr, @-r15
sts.l macl, @-r15
sts.l mach, @-r15
mov r0, r4 /* move obj to 'C' arg */
mov.l .L_dl_bind, r0
bsrf r0
mov r1, r5 /* move reloff to 'C' arg */
.L_call_dl_bind:
lds.l @r15+, mach
lds.l @r15+, macl
lds.l @r15+, pr
mov.l @r15+, r7
mov.l @r15+, r6
mov.l @r15+, r5
mov.l @r15+, r4
mov.l @r15+, r3
jmp @r0 /* jump to specified address */
mov.l @r15+, r2
.align 2
.L_dl_bind:
.long _dl_bind-.L_call_dl_bind
.size _dl_bind_start, .-dl_bind_start
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