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
104 lines
3.1 KiB
ArmAsm
104 lines
3.1 KiB
ArmAsm
/* $NetBSD: rtld_start.S,v 1.10 2009/11/11 14:15:41 skrll Exp $ */
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/*-
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* Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas and by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: rtld_start.S,v 1.10 2009/11/11 14:15:41 skrll Exp $")
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.text
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.align 0
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.globl _rtld_start
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.type _rtld_start,%function
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_rtld_start:
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sub sp, sp, #8 /* make room for obj_main & exit proc */
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mov r4, r0 /* save ps_strings */
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ldr sl, .L2
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ldr r5, .L2+4
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ldr r0, .L2+8
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.L1:
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add sl, pc, sl
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ldr r5, [sl, r5]
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ldr r0, [sl, r0]
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sub r1, sl, r5 /* relocbase */
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add r0, r1, r0 /* &_DYNAMIC */
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bl _rtld_relocate_nonplt_self
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sub r1, sl, r5 /* relocbase */
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mov r0, sp /* sp */
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bl _rtld /* call the shared loader */
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mov r3, r0 /* save entry point */
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ldr r2, [sp, #0] /* r2 = cleanup */
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ldr r1, [sp, #4] /* r1 = obj_main */
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add sp, sp, #8 /* restore stack */
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mov r0, r4 /* restore ps_strings */
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#ifdef _ARM_ARCH_4T
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bx r3 /* jump to the entry point */
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#else
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mov pc, r3 /* jump to the entry point */
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#endif
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.L2:
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.word _GLOBAL_OFFSET_TABLE_ - (.L1+8)
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.word _GLOBAL_OFFSET_TABLE_(GOT)
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.word _DYNAMIC(GOT)
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.align 0
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.globl _rtld_bind_start
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.type _rtld_bind_start,%function
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/*
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* stack[0] = RA
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* ip = &GOT[n+3]
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* lr = &GOT[2]
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*/
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_rtld_bind_start:
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stmdb sp!,{r0-r4,sl,fp}
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sub r1, ip, lr /* r1 = 4 * (n + 1) */
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sub r1, r1, #4 /* r1 = 4 * n */
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add r1, r1, r1 /* r1 = 8 * n */
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ldr r0, [lr, #-4] /* get obj ptr from GOT[1] */
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mov r4, ip /* save GOT location */
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bl _rtld_bind /* Call the binder */
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str r0, [r4] /* save address in GOT */
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mov ip, r0 /* save new address */
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ldmia sp!,{r0-r4,sl,fp,lr} /* restore the stack */
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#ifdef _ARM_ARCH_4T
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bx ip /* jump to the new address */
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#else
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mov pc, ip /* jump to the new address */
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#endif
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