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/* $OpenBSD: ldasm.S,v 1.6 2006/11/14 17:00:25 drahn 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.
*
*/
/*
* correct size is 16 * 4 but the 4096 is because of a stack corruption
* bug that I couldn't find.
*/
#define DL_DATA_SIZE (8192 + 16 * 4) /* XXX */
#define DATA_OFFSET (48) /* XXX */
#include <machine/asm.h>
#include <sys/syscall.h>
#include <SYS.h>
ENTRY(_dl_start)
mov r15, r12 // save for later
sts pr, r11
mov r15, r4 // boot_bind(sp, dl_data) (sp)
mov.l .L_datasize, r0
sub r0, r15
mov.l .L_offset, r0
mov r15, r5
add r0, r5
mov r5, r13
// not trusting register to store the data, push it on the stack.
// callee/caller save questions
mov r15, r14
bsr 1f
nop
1:
.L_offbase:
sts pr, r0
mov.l .L_dynamic, r6
add r0, r6
mov r14, r15
mov r15, r14
mov.l .L_boot_bind, r0
bsrf r0
nop
.L_call_boot_bind:
mov r12, r4
add #4, r4
mov.l @r12, r5 //loads argc
add #2, r5
shll2 r5
add r12, r5 // calc argv
mov r13, r7
mov r7, r6
mov.l .L_loff, r0
add r0, r6
mov.l @r6, r6
mov.l .L_boot, r0
bsrf r0
nop
.L_call_boot:
mov r12, r15
lds r11, pr
mov.l @r15, r4
mov r15, r5
add #4, r5
mov r4, r6
add #1, r6
shll2 r6
add r5, r6 // calc envp
jmp @r0
nop
.align 2
.L_boot_bind:
.long _dl_boot_bind-.L_call_boot_bind
.L_boot:
.long _dl_boot-.L_call_boot
.L_datasize:
.long 4+4+DL_DATA_SIZE
.L_offset:
.long DATA_OFFSET
.L_dynamic:
.long _DYNAMIC-.L_offbase
.L_loff:
.long 7*4
.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
/* 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) ;\
bf .L_cerr ;\
nop ;\
rts ;\
nop
#define DL_SYSCALL2_NOERR(n,c) \
.global __CONCAT(_dl_,n) ;\
.type __CONCAT(_dl_,n)%function ;\
__CONCAT(_dl_,n): ;\
SYSTRAP(c) ;\
rts ;\
nop
.section ".text"
.align 4
DL_SYSCALL(close)
.global _dl_exit
.type _dl_exit%function
_dl_exit:
SYSTRAP(exit)
1:
bra 1b
nop
DL_SYSCALL(issetugid)
DL_SYSCALL2(_syscall,__syscall)
DL_SYSCALL(munmap)
DL_SYSCALL(mprotect)
DL_SYSCALL(open)
DL_SYSCALL(read)
.L_cerr:
mov #-1, r0
rts
nop
DL_SYSCALL(write)
DL_SYSCALL(stat)
DL_SYSCALL(fstat)
DL_SYSCALL(fcntl)
DL_SYSCALL(gettimeofday)
DL_SYSCALL2(sysctl,__sysctl)
DL_SYSCALL(getdirentries)
.global _dl_sigprocmask
.type _dl_sigprocmask%function
_dl_sigprocmask:
mov r5, r2 /* fetch new sigset pointer */
tst r2, r2 /* check new sigset pointer */
bf 1f /* if not null, indirect */
mov #1, r4 /* SIG_BLOCK */
bra 2f
nop
1: mov.l @r2, r2 /* fetch indirect ... */
mov r2, r5 /* to new mask arg */
2: mov.l LSYS_sigprocmask, r0
trapa #0x80
bf .L_cerr
mov r6, r2 /* fetch old mask requested */
tst r2, r2 /* test if old mask requested */
bt out
mov.l r0, @r2 /* store old mask */
out:
xor r0, r0
rts
nop
.align 2
LSYS_sigprocmask:
.long SYS_sigprocmask
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