f14fb60209
* 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
269 lines
7.6 KiB
ArmAsm
269 lines
7.6 KiB
ArmAsm
/* $NetBSD: crtbegin.S,v 1.2 2011/07/04 21:55:09 matt Exp $ */
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/*-
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* Copyright (c) 2011 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 of 3am Software Foundry.
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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 <powerpc/asm.h>
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RCSID("$NetBSD: crtbegin.S,v 1.2 2011/07/04 21:55:09 matt Exp $")
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.section .ctors, "aw", @progbits
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.p2align 2
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__CTOR_LIST__:
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.long -1
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.section .dtors, "aw", @progbits
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.p2align 2
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__DTOR_LIST__:
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.long -1
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.section .eh_frame, "a", @progbits
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.p2align 2
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__EH_FRAME_LIST__:
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.section .jcr, "aw", @progbits
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.p2align 2
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__JCR_LIST__:
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.section ".got2","aw", @progbits
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.LCTOC = . + 32768
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.section .data.rel, "aw", @progbits
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.p2align 2
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.type __dso_handle, @object
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.size __dso_handle, 4
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.globl __dso_handle
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.hidden __dso_handle
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__dso_handle:
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#ifdef SHARED
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.long __dso_handle
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#else
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.long 0
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#endif
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.lcomm __dwarf_eh_object,8*SZREG,SZREG
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.lcomm __initialized,1,1
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.lcomm __finished,1,1
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.text
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.weak __cxa_finalize
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.weak __deregister_frame_info
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.weak __register_frame_info
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.weak _Jv_RegisterClasses
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/*
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* All variables are local to this DSO so we can skip using GOT references
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* and instead use PCREL references to access them. We do this regardless
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* of being PIC since it isn't any additional overhead to do so.
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*
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* We don't setup a TOC since all of ours calls are indirect so it isn't
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* needed.
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*/
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__do_global_dtors_aux:
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mflr %r7 /* save return address */
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bcl 20,31,1f /* find out what address */
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1: mflr %r3 /* we are at */
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mtlr %r7 /* restore return address */
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addis %r4,%r3,__finished-1b@ha /* PCREL ref (upper) */
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lbzu %r0,__finished-1b@l(%r4) /* PCREL ref (lower) & load */
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cmpwi %r0,0 /* done this already? */
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bnelr /* yep, return */
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li %r0, 1
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stb %r0, 0(%r4) /* remember we've done this */
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stw %r7,(1*SZREG)(%r1) /* save LR */
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stwu %r1,-(8*SZREG)(%r1) /* alloc our stack frame */
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stw %r31,(7*SZREG)(%r1) /* save some registers */
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stw %r30,(6*SZREG)(%r1)
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stw %r29,(5*SZREG)(%r1)
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stw %r28,(4*SZREG)(%r1)
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mr %r29,%r3 /* move this to a safe place */
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/*
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* Get a reference to our TOC.
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*/
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addis %r30,%r29,.LCTOC-1b@ha
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addi %r30,%r30,.LCTOC-1b@l
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/*
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* Get a reference to the GOT.
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*/
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addis %r31,%r29,_GLOBAL_OFFSET_TABLE_-1b@ha /* pcrel (hi) */
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addi %r31,%r31,_GLOBAL_OFFSET_TABLE_-1b@l /* pcrel (lo) */
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#ifdef SHARED
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/*
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* if (__cxa_finalize)
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* __cxa_finalize(&__dso_handle);
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*/
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lwz %r0, __cxa_finalize@got(%r31)
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cmpwi %r0, 0
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beq 2f
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addis %r3,%r29,__dso_handle-1b@ha /* get &__dso_handle (pcrel) */
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addi %r3,%r3,__dso_handle-1b@l
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mtctr %r0 /* setup for indirect branch */
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bctrl /* and call the routine */
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2:
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#endif
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addis %r28,%r29,__DTOR_LIST__-1b@ha /* get &__DTOR_LIST__ */
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addi %r28,%r28,__DTOR_LIST__-1b@l
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/*
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* We know the first entry is -1 so skip it. We use load with update
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* to advance the pointer along.
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*/
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3:
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lwzu %r0, 4(%r28) /* get entry */
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cmpwi %r0, 0 /* end of list? */
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beq 4f /* yep. */
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mtctr %r0 /* setup for indirect branch */
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bctrl /* and call the routine */
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b 3b /* do it again */
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4:
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/*
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* if (__deregister_frame_info)
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* __deregister_frame_info(&__EH_FRAME_LIST__[0]);
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*/
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lwz %r0,__deregister_frame_info@got(%r31)
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cmpwi %r0, 0 /* routine actually exist? */
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beq 5f /* nope, skip call */
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addis %r3,%r29,__EH_FRAME_LIST__-1b@ha
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addi %r3,%r3,__EH_FRAME_LIST__-1b@l
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mtctr %r0 /* setup for indirect branch */
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bctrl /* and call the routine */
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5:
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lwz %r28,(4*SZREG)(%r1) /* restore registers */
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lwz %r29,(5*SZREG)(%r1)
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lwz %r30,(6*SZREG)(%r1)
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lwz %r31,(7*SZREG)(%r1)
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addi %r1,%r1,8*SZREG /* adjust stack */
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lwz %r0,(1*SZREG)(%r1) /* get return addr */
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mtlr %r0
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blr /* and return */
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__do_global_ctors_aux:
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mflr %r7 /* save return address */
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bcl 20,31,1f /* find out what address */
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1: mflr %r3 /* we are at */
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mtlr %r7 /* restore return address */
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addis %r4,%r3,__initialized-1b@ha /* pcrel (hi) */
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lbzu %r0,__initialized-1b@l(%r4) /* pcrel (lo) load+update */
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cmpwi %r0,0 /* have we already done this? */
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bnelr /* yep, return */
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li %r0,1
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stb %r0,0(%r4) /* remember we've been here */
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stw %r7,(1*SZREG)(%r1) /* save LR */
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stwu %r1,-(8*SZREG)(%r1) /* alloc our stack frame */
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stw %r31,(7*SZREG)(%r1) /* save some registers */
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stw %r30,(6*SZREG)(%r1)
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stw %r29,(5*SZREG)(%r1)
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stw %r28,(4*SZREG)(%r1)
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mr %r29,%r3 /* move this to a safe place */
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/*
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* Get a reference to our TOC.
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*/
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addis %r30,%r29,.LCTOC-1b@ha
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addi %r30,%r30,.LCTOC-1b@l
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/*
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* Get a reference to the GOT.
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*/
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addis %r31,%r29,_GLOBAL_OFFSET_TABLE_-1b@ha /* pcrel (hi) */
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addi %r31,%r31,_GLOBAL_OFFSET_TABLE_-1b@l /* pcrel (lo) */
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/*
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* if (__register_frame_info)
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* __register_frame_info(&__EH_FRAME_LIST__[0], &__dwarf_eh_object)
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*/
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lwz %r0, __register_frame_info@got(%r31)
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cmpwi %r0, 0
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beq 2f
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addis %r3,%r29,__EH_FRAME_LIST__-1b@ha /* pcrel (hi) */
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addi %r3,%r3,__EH_FRAME_LIST__-1b@l /* pcrel (lo) */
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addis %r4,%r29,__dwarf_eh_object-1b@ha /* pcrel (hi) */
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addi %r4,%r4,__dwarf_eh_object-1b@l /* pcrel (lo) */
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mtctr %r0 /* setup for indirect branch */
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bctrl /* and call the routine */
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2:
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/*
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* if (_Jv_RegisterClasses && __JCR_LIST__[0])
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* _Jv_RegisterClasses(&__JCR_LIST__[0]);
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*/
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lwz %r0, _Jv_RegisterClasses@got(%r31)
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cmpwi %r0, 0
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beq 3f
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mtctr %r0 /* setup for indirect branch */
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addis %r3, %r29, __JCR_LIST__-1b@ha /* pcrel (hi) */
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addi %r3, %r3, __JCR_LIST__-1b@l /* pcrel (lo) */
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lwz %r4, 0(%r3) /* load first entry */
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cmpwi %r4, 0 /* is the list empty? */
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bnectrl /* call the routine if not */
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3:
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/*
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* Get end of list of CTOR list.
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*/
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addis %r28,%r29,__CTOR_LIST_END__-1b@ha
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addi %r28,%r28,__CTOR_LIST_END__-1b@l
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4:
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lwzu %r0, -4(%r28) /* get entry */
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cmpwi %r0, -1 /* first entry? */
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beq 5f /* yes, we're done */
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mtctr %r0 /* setup for indirect branch */
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bctrl /* call the routine */
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b 4b /* do it again */
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5:
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lwz %r28,(4*SZREG)(%r1) /* restore registers */
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lwz %r29,(5*SZREG)(%r1)
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lwz %r30,(6*SZREG)(%r1)
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lwz %r31,(7*SZREG)(%r1)
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addi %r1,%r1,8*SZREG /* adjust stack */
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lwz %r0,(1*SZREG)(%r1) /* get return addr */
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mtlr %r0
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blr /* and return */
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.section .init, "ax", @progbits
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bl __do_global_ctors_aux
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.section .fini, "ax", @progbits
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bl __do_global_dtors_aux
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