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/* $OpenBSD: ldasm.S,v 1.13 2014/07/14 03:54:51 deraadt 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>
#include <SYS.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
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.
move t9, v0 # Entry address from _dl_boot.
LA v0, _dl_dtors # cleanup
RESTORE_GP64
PTR_ADDU sp, FRAMESZ # Restore stack pointer.
move ra, zero # Mark last stack frame.
j t9 # Go execute the 'real' program.
END(_dl_start)
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
#define DL_SYSCALL(n) DL_SYSCALL2(n,n)
#define DL_SYSCALL_NOERR(n) DL_SYSCALL2_NOERR(n,n)
#define DL_SYSCALL2(n,c) \
NLEAF(_dl_##n,0) \
__DO_SYSCALL(c); \
bnez a3, _dl_cerror; \
j ra; \
END(_dl_##n)
#define DL_SYSCALL2_NOERR(n,c) \
NLEAF(_dl_##n,0) \
__DO_SYSCALL(c); \
j ra; \
END(_dl_##n)
_dl_cerror:
subu v0, zero, v0
j ra
NLEAF(_dl_sigprocmask,0)
/* _dl_sigprocmask does not support NULL as the new mask */
#if 0
bnez a1, 1f
li a0, 1 /* SIG_BLOCK */
b 2f
1:
#endif
lw a1, 0(a1)
2:
__DO_SYSCALL(sigprocmask)
bnez a3, _dl_cerror
beqz a2, 1f
sw v0, 0(a2)
1:
li v0, 0
j ra
END(_dl_sigprocmask)
DL_SYSCALL(close)
DL_SYSCALL_NOERR(exit)
DL_SYSCALL(fstat)
DL_SYSCALL2(getcwd,__getcwd)
DL_SYSCALL(getdents)
DL_SYSCALL(getentropy)
DL_SYSCALL(sendsyslog)
DL_SYSCALL(gettimeofday)
DL_SYSCALL_NOERR(issetugid)
DL_SYSCALL(lstat)
DL_SYSCALL(mprotect)
DL_SYSCALL(munmap)
DL_SYSCALL(open)
DL_SYSCALL(read)
DL_SYSCALL(readlink)
DL_SYSCALL2(_syscall,__syscall)
DL_SYSCALL2(sysctl,__sysctl)
DL_SYSCALL(utrace)
DL_SYSCALL(write)
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