minix/lib/csu/arch/arm/crtbegin.S
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

293 lines
7.6 KiB
ArmAsm

/* $NetBSD: crtbegin.S,v 1.4 2012/08/25 15:39:05 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 1.4 2012/08/25 15:39:05 matt Exp $")
.section .ctors, "aw", %progbits
.p2align 2
__CTOR_LIST__:
.word -1
.section .dtors, "aw", %progbits
.p2align 2
__DTOR_LIST__:
.word -1
.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
.local __dwarf_eh_object
.comm __dwarf_eh_object,24
.local __initialized
.comm __initialized,1
.local __finished
.comm __finished,1
.text
/*
* All variables are local to this DSO so we can skip using GOT references
* and instead use PCREL references to access them. We do this regardless
* of being PIC since it isn't any additional overhead to do so.
*
* We don't setup a TOC since all of ours calls are indirect so it isn't
* needed.
*/
.type __do_global_dtors_aux, %function
__do_global_dtors_aux:
GOT_INIT(r3, .Ldtors_got, .Ldtors) /* use r3 temporarily */
ldr r1, .L__finished
#ifdef PIC
ldrb r0, [r1, r3]!
#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, r6, r7, fp, ip, lr, pc}
sub fp, ip, #4
mov r7, r3 /* now that r7 is saved ... */
#ifdef SHARED
GOT_GET(ip, r7, .L__cxa_finalize)
cmp ip, #0
ldrne r2, .L__dso_handle /* GOTOFF */
ldrne r0, [r2, r7] /* load relative to GOT */
#ifdef _ARM_ARCH_4T
blxne ip
#else
movne lr, pc
movne pc, ip
#endif
#endif /* SHARED */
/*
* We know the first entry is -1 so skip it. We use load with
* preincrement to advance the pointer along.
*/
ldr r4, .L__DTOR_LIST__
ldr r5, .L__DTOR_LIST_END__
#ifdef PIC
add r4, r4, r7 /* addr = offset + got */
add r5, r5, r7 /* addr = offset + got */
#endif
add r4, r4, #4 /* skip first entry */
1:
cmp r4, r5 /* end of list */
ldrne ip, [r4], #4 /* ip = *r4++; */
#ifndef SHARED
ldmeqfd sp, {r4, r5, r6, r7, fp, sp, pc} /* restore and return */
#endif
adrne lr, 1b /* set up to return to loop start */
#ifdef _ARM_ARCH_4T
bxne ip /* call it */
#else
movne pc, ip /* call entry */
#endif
#ifdef SHARED
/*
* if (__deregister_frame_info)
* __deregister_frame_info(&__EH_FRAME_LIST__[0]);
*/
GOT_GET(ip, r7, .L__deregister_frame_info)
cmp ip, #0
ldmeqfd sp, {r4-r7, fp, sp, pc} /* restore and return */
ldr r1, .L__EH_FRAME_LIST__
#ifdef PIC
add r0, r1, r7 /* add offset to GOT addr */
#endif
ldmfd sp, {r4-r7, fp, sp, lr} /* restore everthing */
#ifdef _ARM_ARCH_4T
bx ip /* tail call it */
#else
mov pc, ip /* tail call it */
#endif
#endif /* SHARED */
.weak __deregister_frame_info
.weak __cxa_finalize
.hidden _C_LABEL(__DTOR_LIST_END__)
.align 2
GOT_INITSYM(.Ldtors_got, .Ldtors)
#ifdef SHARED
.L__deregister_frame_info:
.word PIC_SYM(_C_LABEL(__deregister_frame_info), GOT)
.L__cxa_finalize:
.word PIC_SYM(_C_LABEL(__cxa_finalize), GOT)
.L__dso_handle:
.word PIC_SYM(_C_LABEL(__dso_handle), GOTOFF)
#endif
.L__finished:
.word PIC_SYM(_C_LABEL(__finished), GOTOFF)
.L__DTOR_LIST__:
.word PIC_SYM(_C_LABEL(__DTOR_LIST__), GOTOFF)
.L__DTOR_LIST_END__:
.word PIC_SYM(_C_LABEL(__DTOR_LIST_END__), GOTOFF)
.L__EH_FRAME_LIST__:
.word PIC_SYM(_C_LABEL(__EH_FRAME_LIST__), GOTOFF)
.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
#ifdef PIC
ldrb r0, [r1, r3]!
#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, r6, r7, fp, ip, lr, pc}
sub fp, ip, #4
mov r7, r3 /* now that r7 is saved ... */
/*
* if (__register_frame_info)
* __register_frame_info(&__EH_FRAME_LIST__[0], &__dwarf_eh_object)
*/
GOT_GET(ip, r7, .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, r7 /* object addr = got addr + offset */
add r1, r1, r7 /* object addr = got addr + offset */
#endif
#ifdef _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, r7, .L_Jv_RegisterClasses)
cmp ip, #0
ldrne r0, .L__JCR_LIST__
#ifdef PIC
ldrne r2, [r0, r7]! /* load 1st one, make r0 point to it */
#else
ldrne r2, [r0] /* load 1st one */
#endif
cmpne r2, #0
#ifdef _ARM_ARCH_4T
blxne ip
#else
movne lr, pc
movne pc, ip
#endif
/*
* Get the start and end of the CTOR list.
*/
ldr r4, .L__CTOR_LIST__
ldr r5, .L__CTOR_LIST_END__
#ifdef PIC
add r4, r4, r7 /* object addr = got addr + offset */
add r5, r5, r7 /* object addr = got addr + offset */
#endif
sub r5, r5, #4 /* ignore first entry */
3:
cmp r4, r5 /* at first entry? */
ldmeqfd sp, {r4-r7, fp, sp, pc} /* then return */
adr lr, 3b /* return to start of loop */
ldr ip, [r5], #-4 /* get entry */
#ifdef _ARM_ARCH_4T
bx ip
#else
mov pc, ip /* get entry */
#endif
.hidden _C_LABEL(__CTOR_LIST_END__)
.align 2
GOT_INITSYM(.Lctors_got, .Lctors)
.L_Jv_RegisterClasses:
.word PIC_SYM(_C_LABEL(_Jv_RegisterClasses), GOT)
.L__register_frame_info:
.word PIC_SYM(_C_LABEL(__register_frame_info), GOT)
.L__initialized:
.word PIC_SYM(_C_LABEL(__initialized), GOTOFF)
.L__CTOR_LIST__:
.word PIC_SYM(_C_LABEL(__CTOR_LIST__), GOTOFF)
.L__CTOR_LIST_END__:
.word PIC_SYM(_C_LABEL(__CTOR_LIST_END__), 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)
.section .init, "ax", %progbits
bl __do_global_ctors_aux
.section .fini, "ax", %progbits
bl __do_global_dtors_aux