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/* $OpenBSD: ldasm.S,v 1.6 2010/03/27 20:45:09 kettenis Exp $ */
/*
* Copyright (c) 1998-2002 Opsycon AB, Sweden.
*
* 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.
*
*/
#include <machine/asm.h>
#include <sys/syscall.h>
/* Stack at this stage is:
* struct stack {
* int kargc;
* char *kargv[1]; size depends on kargc
* char kargstr[1]; size varies
* char kenvstr[1]; size varies
* };
*/
FRAMESZ= MKFSIZ(4,16)
GPOFF= FRAMESZ-2*REGSZ
RAOFF= FRAMESZ-1*REGSZ
LEAF(_dl_start, FRAMESZ) /* Not really LEAF, but we simplify */
PTR_SUBU sp, FRAMESZ # Some space.
SETUP_GP64(GPOFF, _dl_start)
LA s1, 1f
bgezal zero, 1f
1:
PTR_SUBU s0, ra, s1 # This is the load offset
LA t0, _fdata
PTR_SRL t0, 20 # check if distance is > 2**16.
beqz t0, 2f
li t0, 0x10000
li t0, 0x100000
2:
# This is a hack to change protection of .rodata so it
# can be relocated. A better way to find the location
# of .rodata should probably be used.
# We know that .rodata is aligned on 0x100000 or 0x10000
# and is at most 64 k in size.
li v0, SYS_mprotect
or a0, ra, 0xfff
xor a0, 0xfff
PTR_ADDU a0, t0
li a1, 0x10000
li a2, 7 /* (PROT_READ|PROT_WRITE|PROT_EXEC) */
syscall
PTR_ADDU a0, sp, FRAMESZ # Where stack info is.
PTR_ADDU a1, sp, 0 # Where fast AUX info will be.
LA t9, _dl_boot_bind
PTR_ADDU t9, s0
jalr t9 # Relocate ourself.
REG_L a3, FRAMESZ(sp) # argc
PTR_ADDU a0, sp, FRAMESZ+REGSZ # argv
PTR_ADDU a1, a0, REGSZ
PTR_SLL a3, a3, LOGREGSZ
PTR_ADDU a1, a3
PTR_ADDU a3, sp, 0 # Where fast AUX info will be.
move a2, s0 # Load offset
jal _dl_boot # Go do the linking.
RESTORE_GP64
PTR_ADDU sp, FRAMESZ # Restore stack pointer.
move t9, v0 # Entry address from _dl_boot.
j t9 # Go execute the 'real' program.
END(_dl_start)
LEAF(_dl__syscall, 0)
li v0, SYS___syscall # Indirect syscall.
syscall
bne a3, zero, 1f
j ra
1:
li v0, -1
j ra
END(_dl__syscall)
FRAMESZ= MKFSIZ(4,16)
GPOFF= FRAMESZ-2*REGSZ
RAOFF= FRAMESZ-1*REGSZ
A0OFF= FRAMESZ-3*REGSZ
A1OFF= FRAMESZ-4*REGSZ
A2OFF= FRAMESZ-5*REGSZ
A3OFF= FRAMESZ-6*REGSZ
A4OFF= FRAMESZ-7*REGSZ
A5OFF= FRAMESZ-8*REGSZ
A6OFF= FRAMESZ-9*REGSZ
A7OFF= FRAMESZ-10*REGSZ
S0OFF= FRAMESZ-11*REGSZ
.globl _dl_bind_start
.ent _dl_bind_start, 0
_dl_bind_start:
ld v1, -32744(gp)
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, _dl_bind_start)
REG_S a0, A0OFF(sp)
REG_S a1, A1OFF(sp)
REG_S a2, A2OFF(sp)
REG_S a3, A3OFF(sp)
REG_S a4, A4OFF(sp)
REG_S a5, A5OFF(sp)
REG_S a6, A6OFF(sp)
REG_S a7, A7OFF(sp)
REG_S $15, RAOFF(sp)
REG_S s0, S0OFF(sp)
move s0, sp
move a0, v1
move a1, t8
jal _dl_bind
move sp, s0
REG_L ra, RAOFF(sp)
REG_L s0, S0OFF(sp)
REG_L a0, A0OFF(sp)
REG_L a1, A1OFF(sp)
REG_L a2, A2OFF(sp)
REG_L a3, A3OFF(sp)
REG_L a4, A4OFF(sp)
REG_L a5, A5OFF(sp)
REG_L a6, A6OFF(sp)
REG_L a7, A7OFF(sp)
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
move t9, v0
jr t9
.end _dl_bind_start
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