minix/lib/csu/arch/earm/crtbegin.S

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/* $NetBSD: crtbegin.S,v 1.1 2012/08/13 02:49:04 matt Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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 <arm/asm.h>
RCSID("$NetBSD: crtbegin.S,v 1.1 2012/08/13 02:49:04 matt Exp $")
.section .eh_frame, "a", %progbits
.p2align 2
__EH_FRAME_LIST__:
.section .jcr, "aw", %progbits
.p2align 2
__JCR_LIST__:
.section .data.rel, "aw", %progbits
.p2align 2
.type __dso_handle, %object
.size __dso_handle, 4
.globl __dso_handle
.hidden __dso_handle
__dso_handle:
#ifdef SHARED
.word __dso_handle
#else
.word 0
#endif
.text
#ifdef SHARED
/*
* If we aren't shared, all we do is set finished
* to 1 if it isn't 1 already. So why bother do that at all?
*/
.type __do_global_dtors_aux, %function
__do_global_dtors_aux:
GOT_INIT(r3, .Ldtors_got, .Ldtors) /* use r3 temporarily */
ldr r1, .L__finished /* GOTOFF */
ldrb r0, [r1, r3]!
cmp r0, #0 /* done this already? */
RETc(ne)
mov r0, #1
strb r0, [r1] /* mark it as done */
GOT_GET(ip, r3, .L__cxa_finalize)
cmp ip, #0
RETc(eq)
ldr r0, .L__dso_handle /* GOTOFF */
ldr r0, [r0, r3] /* load relative to got */
#if defined(_ARM_ARCH_4T)
bx ip /* tail call */
#else
mov pc, ip
#endif
#if 0 /* not used */
/*
* if (__deregister_frame_info)
* __deregister_frame_info(&__EH_FRAME_LIST__[0]);
*/
GOT_GET(ip, r3, .L__deregister_frame_info)
cmp ip, #0
ldmeqfd sp, {r4, r5, fp, sp, pc} /* restore and return */
ldr r1, .L__EH_FRAME_LIST__ /* GOTOFF */
add r1, r1, r4 /* add got addr */
ldmfd sp, {r4, r5, fp, sp, lr} /* restore everthing */
#if !defined(_ARM_ARCH_4T)
bx ip /* tail call it */
#else
mov pc, ip /* tail call it */
#endif
#endif /* notused */
.weak __cxa_finalize
.weak __deregister_frame_info
.align 2
GOT_INITSYM(.Ldtors_got, .Ldtors)
.L__cxa_finalize:
.word PIC_SYM(_C_LABEL(__cxa_finalize), GOT)
#if 0
.L__deregister_frame_info:
.word PIC_SYM(_C_LABEL(__deregister_frame_info), GOT)
#endif
.L__finished:
.word PIC_SYM(_C_LABEL(__finished), GOTOFF)
.L__dso_handle:
.word PIC_SYM(_C_LABEL(__dso_handle), GOTOFF)
.pushsection .fini_array,"aw",%fini_array
.p2align 2
.word __do_global_dtors_aux
.popsection
#endif /* SHARED */
.local __finished
.comm __finished,1,1
.weak __register_frame_info
.weak _Jv_RegisterClasses
.type __do_global_ctors_aux, %function
__do_global_ctors_aux:
GOT_INIT(r3, .Lctors_got, .Lctors)
ldr r1, .L__initialized /* GOTOFF if PIC */
#ifdef PIC
ldrb r0, [r1, r3]! /* r1 = r1 + got */
#else
ldrb r0, [r1]
#endif
cmp r0, #0 /* done this already? */
RETc(ne)
mov r0, #1
strb r0, [r1] /* mark it as done */
mov ip, sp
stmfd sp!, {r4, r5, fp, ip, lr, pc}
sub fp, ip, #4
mov r4, r3 /* now that r4 is saved ... */
/*
* if (__register_frame_info)
* __register_frame_info(&__EH_FRAME_LIST__[0], &__dwarf_eh_object)
*/
GOT_GET(ip, r4, .L__register_frame_info)
cmp ip, #0
beq 1f
ldr r0, .L__EH_FRAME_LIST__
ldr r1, .L__dwarf_eh_object
#ifdef PIC
add r0, r0, r4
add r1, r1, r4
#endif
#if defined(_ARM_ARCH_4T)
blx ip
#else
mov lr, pc
mov pc, ip
#endif
1:
/*
* if (_Jv_RegisterClasses && __JCR_LIST__[0])
* _Jv_RegisterClasses(&__JCR_LIST__[0]);
*/
GOT_GET(ip, r4, .L_Jv_RegisterClasses)
cmp ip, #0
ldmeqfd sp, {r4, r5, fp, sp, pc} /* return if null */
ldr r0, .L__JCR_LIST__
#ifdef PIC
ldr r2, [r0, r4]! /* GOTOFF + got == address */
#else
ldr r2, [r0]
#endif
cmp r2, #0
ldmfd sp, {r4, r5, fp, sp, lr} /* restore everything */
RETc(eq) /* return if null */
#if defined(_ARM_ARCH_4T)
bx ip /* return or tail call */
#else
mov pc, ip /* return or tail call */
#endif
.p2align 2
GOT_INITSYM(.Lctors_got, .Lctors)
.L__register_frame_info:
.word PIC_SYM(_C_LABEL(__register_frame_info), GOT)
.L_Jv_RegisterClasses:
.word PIC_SYM(_C_LABEL(_Jv_RegisterClasses), GOT)
.L__initialized:
.word PIC_SYM(_C_LABEL(__initialized), GOTOFF)
.L__EH_FRAME_LIST__:
.word PIC_SYM(_C_LABEL(__EH_FRAME_LIST__), GOTOFF)
.L__dwarf_eh_object:
.word PIC_SYM(_C_LABEL(__dwarf_eh_object), GOTOFF)
.L__JCR_LIST__:
.word PIC_SYM(_C_LABEL(__JCR_LIST__), GOTOFF)
.local __initialized
.comm __initialized,1,1
.local __dwarf_eh_object
.comm __dwarf_eh_object,24,4
.section .init_array,"aw",%init_array
.p2align 2
.word __do_global_ctors_aux