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d5bfa34a53
* sysdeps/hppa/start.S (_start): Check PIC instead of SHARED. Load address of $global$ into %dp register earlier. Use pc-relative instruction sequence for PIC case.
153 lines
4.3 KiB
ArmAsm
153 lines
4.3 KiB
ArmAsm
/* ELF startup code for HPPA.
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Copyright (C) 2002-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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.import main, code
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.import $global$, data
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.import __libc_start_main, code
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.import __libc_csu_fini, code
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.import __libc_csu_init, code
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/* Have the linker create plabel words so we get PLABEL32
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relocs and not 21/14. The use of 21/14 relocs is only
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supported in the latest dynamic linker. */
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#ifdef PIC
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.section .data.rel.ro,"aw",@progbits
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#else
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.section .rodata,"a",@progbits
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#endif
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.align 4
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.Lpmain:
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.word P%main
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.Lp__libc_start_main:
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.word P%__libc_start_main
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.Lp__libc_csu_fini:
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.word P%__libc_csu_fini
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.Lp__libc_csu_init:
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.word P%__libc_csu_init
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.text
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.align 4
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.globl _start
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.export _start, ENTRY
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.type _start,@function
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_start:
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/* At entry to the function we have:
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r26 - Unused
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r25 - argc
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r24 - argv
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r23 - False _dl_fini plabel address
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This function is called from the lower half of RTLD_START.
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The call to __libc_start_main expects:
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1. r26 - Application main
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2. r25 - argc
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3. r24 - argv
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4. r23 - __libc_csu_init
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5. sp-52 - __libc_csu_fini
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6. sp-56 - rtld_fini
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7. sp-60 - stackend */
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.proc
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.callinfo
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/* Clear previous-sp. */
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stw %r0, -4(%sp)
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/* Setup the stack and frame. */
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stw %rp, -20(%sp)
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ldo 64(%sp), %sp
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stw %sp, -4(%sp)
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stw %r19, -32(%sp)
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/* argc and argv should be in 25 and 24 (2nd and 3rd argument) */
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/* void (*rtld_fini) (void) (6th argument) */
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stw %r23, -56(%sp)
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/* Need to setup 1, 4, 5, and 7th arguments */
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#ifdef PIC
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/* Load $global$ address into %dp */
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bl .+8, %dp
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addil L'$global$-$PIC_pcrel$0+1, %dp
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ldo R'$global$-$PIC_pcrel$0+5(%r1), %dp
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/* load main (1st argument) */
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addil LT'.Lpmain, %r19
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ldw RT'.Lpmain(%r1), %r26
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ldw 0(%r26),%r26
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/* void (*init) (void) (4th argument) */
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addil LT'.Lp__libc_csu_init, %r19
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ldw RT'.Lp__libc_csu_init(%r1), %r23
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ldw 0(%r23), %r23
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/* void (*fini) (void) (5th argument) */
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addil LT'.Lp__libc_csu_fini, %r19
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ldw RT'.Lp__libc_csu_fini(%r1), %r22
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ldw 0(%r22), %r22
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#else
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/* Load $global$ address into %dp */
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ldil L%$global$, %dp
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ldo R%$global$(%dp), %dp
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/* load main (1st argument) */
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ldil LR'.Lpmain, %r26
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ldw RR'.Lpmain(%r26), %r26
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/* void (*init) (void) (4th argument) */
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ldil LR'.Lp__libc_csu_init, %r23
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ldw RR'.Lp__libc_csu_init(%r23), %r23
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/* void (*fini) (void) (5th argument) */
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ldil LR'.Lp__libc_csu_fini, %r22
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ldw RR'.Lp__libc_csu_fini(%r22), %r22
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#endif
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/* Store 5th argument */
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stw %r22, -52(%sp)
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/* void *stack_end (7th argument) */
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stw %sp, -60(%sp)
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bl __libc_start_main,%r2
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nop
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/* die horribly if it returned (it shouldn't) */
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iitlbp %r0,(%sr0,%r0)
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nop
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.procend
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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