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/* $NetBSD: rtld_start.S,v 1.10 2009/12/14 00:41:19 matt Exp $ */
/*
* Copyright 1997 Michael L. Hitch <mhitch@montana.edu>
* Portions copyright 2002 Charles M. Hannum <root@ihack.net>
* All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 <mips/asm.h>
.globl _C_LABEL(_rtld_relocate_nonplt_self)
.globl _C_LABEL(_rtld)
#define PTR_SIZE (1<<PTR_SCALESHIFT)
LEAF(rtld_start)
.frame sp, 4*PTR_SIZE, ra
.mask 0x10090000,-PTR_SIZE
.set noreorder
SETUP_GP
PTR_SUBU sp, 4*PTR_SIZE # adjust stack pointer
SETUP_GP64(s4, rtld_start)
SAVE_GP(0)
# -> 1*PTR_SIZE(sp) for atexit
# -> 2*PTR_SIZE(sp) for obj_main
move s0, a0 # save stack pointer from a0
move s3, a3 # save ps_strings pointer
PTR_LA a1, 1f
bal 1f
PTR_LA t0, _C_LABEL(_rtld_relocate_nonplt_self)
1: PTR_SUBU a1, ra, a1 # relocbase
move s2, a1 # save for _rtld
PTR_LA a0, _DYNAMIC
PTR_ADDU t9, a1, t0
jalr t9 # _rtld_relocate_nonplt_self(dynp, relocabase)
PTR_ADDU a0, a1, a0 # &_DYNAMIC
move a1, s2 # relocbase
PTR_ADDU a0, sp, 2*PTR_SIZE # sp
jal _C_LABEL(_rtld) # v0 = _rtld(sp, relocbase)
nop
PTR_L a1, 2*PTR_SIZE(sp) # our atexit function
PTR_L a2, 3*PTR_SIZE(sp) # obj_main entry
PTR_ADDU sp, 4*PTR_SIZE # readjust stack
move a0, s0 # stack pointer
move t9, v0
jr t9 # _start(sp, cleanup, obj);
move a3, s3 # restore ps_strings
END(rtld_start)
#define XCALLFRAME_SIZ (12*SZREG)
#define XCALLFRAME_RA (10*SZREG)
#define XCALLFRAME_GP (9*SZREG)
#define XCALLFRAME_S0 (8*SZREG)
#define XCALLFRAME_A3 (7*SZREG)
#define XCALLFRAME_A2 (6*SZREG)
#define XCALLFRAME_A1 (5*SZREG)
#define XCALLFRAME_A0 (4*SZREG)
#if defined(__mips_n32) || defined(__mips_n64)
#define XCALLFRAME_A7 (3*SZREG)
#define XCALLFRAME_A6 (2*SZREG)
#define XCALLFRAME_A5 (1*SZREG)
#define XCALLFRAME_A4 (0*SZREG)
#endif
.globl _rtld_bind_start
.ent _rtld_bind_start
_rtld_bind_start:
.frame sp, XCALLFRAME_SIZ, $15
move v1, gp # save old GP
#if defined(__mips_o32) || defined(__mips_o64)
PTR_ADDU t9, 8 # modify T9 to point at .cpload
#endif
SETUP_GP
PTR_SUBU sp, XCALLFRAME_SIZ # save arguments and sp value in stack
SETUP_GP64(XCALLFRAME_GP, _rtld_bind_start)
SAVE_GP(XCALLFRAME_GP)
#if defined(__mips_n32) || defined(__mips_n64)
REG_S a4, XCALLFRAME_A4(sp)
REG_S a5, XCALLFRAME_A5(sp)
REG_S a6, XCALLFRAME_A6(sp)
REG_S a7, XCALLFRAME_A7(sp)
#endif
REG_S a0, XCALLFRAME_A0(sp)
REG_S a1, XCALLFRAME_A1(sp)
REG_S a2, XCALLFRAME_A2(sp)
REG_S a3, XCALLFRAME_A3(sp)
REG_S $15, XCALLFRAME_RA(sp) # ra is in t7/t3
REG_S s0, XCALLFRAME_S0(sp)
move s0, sp
move a0, t8 # symbol index
move a1, $15 # old RA
move a2, v1 # old GP
move a3, ra # current RA
jal _C_LABEL(_rtld_bind)
nop
move sp, s0
REG_L ra, XCALLFRAME_RA(sp)
REG_L s0, XCALLFRAME_S0(sp)
REG_L a0, XCALLFRAME_A0(sp)
REG_L a1, XCALLFRAME_A1(sp)
REG_L a2, XCALLFRAME_A2(sp)
REG_L a3, XCALLFRAME_A3(sp)
#if defined(__mips_n32) || defined(__mips_n64)
REG_L a4, XCALLFRAME_A4(sp)
REG_L a5, XCALLFRAME_A5(sp)
REG_L a6, XCALLFRAME_A6(sp)
REG_L a7, XCALLFRAME_A7(sp)
#endif
RESTORE_GP64
PTR_ADDU sp, XCALLFRAME_SIZ
move t9, v0
jr t9
nop
END(_rtld_bind_start)
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