e83f7ba2c9
. file- and functionality-compatible with previous situation
(FreeBSD csu) (with a crt1.o -> crt0.o symlink in /usr/lib)
. harmonizes source with netbsd
. harmonizes linker invocation (e.g. clang) with netbsd
. helpful to get some arm code in there for the arm port project
141 lines
4.5 KiB
ArmAsm
141 lines
4.5 KiB
ArmAsm
/* $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)
|