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/*
* Copyright (C) 2003 by Erik Andersen
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
* for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this program; see the file COPYING.LIB. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <features.h>
/* Integer registers. */
#define r0 0
#define r1 1
#define r2 2
#define r3 3
#define r4 4
#define r5 5
#define r6 6
#define r7 7
#define r8 8
#define r9 9
#define r10 10
#define r13 13
#define r31 31
.text
.globl _start
.type _start,%function
.type _init,%function
.type _fini,%function
#ifndef __UCLIBC_CTOR_DTOR__
.weak _init
.weak _fini
#endif
#ifdef L_rcrt1
.type reloc_static_pie,%function
#endif
.type main,%function
.type __uClibc_main,%function
_start:
mr r9,r1 /* Save the stack pointer and pass it to __uClibc_main */
clrrwi r1,r1,4 /* Align stack ptr to 16 bytes */
#ifdef __PIC__
# ifdef HAVE_ASM_PPC_REL16
bcl 20,31,1f
1: mflr r31
addis r31,r31,_GLOBAL_OFFSET_TABLE_-1b@ha
addi r31,r31,_GLOBAL_OFFSET_TABLE_-1b@l
# else
bl _GLOBAL_OFFSET_TABLE_-4@local
mflr r31
# endif
/* in PIC/PIE, plt stubs need r30 to point to the GOT if using secure-plt */
# ifdef PPC_HAS_SECUREPLT
mr 30,31
# endif
#ifdef L_rcrt1
stwu r3, -4(r1) /* Save r3 */
stwu r9, -16(r1) /* Save r9 */
bcl 20,31,2f /* Jump to label 2 */
2: mflr r3 /* Load lr into r3 */
addis r3, r3, _DYNAMIC-2b@ha /* Add high half of _DYNAMIC to r3 */
addi r3,r3,_DYNAMIC-2b@l /* Add low half of _DYNAMIC */
lwz r4, 0(r31) /* load _DYNAMIC from the GOT */
subf r3, r4, r3 /* sub _DYNAMIC@got and it's actual address */
bl reloc_static_pie /* Call reloc_static_pie */
lwzu r9, 0(r1) /* restore r9 */
addi r1, r1, 16 /* update stack pointer */
lwzu r3, 0(r1) /* restore r3 */
addi r1, r1, 4 /* update stack pointer */
li r5, 0 /* zero r5 */
#endif
#endif
/* Set up the small data pointer in r13. */
#ifdef __PIC__
lwz r13,_SDA_BASE_@got(r31)
#else
lis r13,_SDA_BASE_@ha
addi r13,r13,_SDA_BASE_@l
#endif
/* Set up an initial stack frame, and clear the LR. */
li r0,0
stwu r1,-16(r1)
mtlr r0
stw r0,0(r1)
/* find argc from the stack pointer */
lwz r4,0(r9)
/* find argv one word offset from the stack pointer */
addi r5,r9,4
mr r8,r3 /* Pass _dl_fini from ldso or NULL if statically linked */
/* Note: PPC depends on the kernel to zero r3 before */
/* handing over to user space, otherwise static apps */
/* will SEGV during exit() */
/* Ok, now run uClibc's main() -- shouldn't return */
#ifdef __PIC__
lwz r6,_init@got(r31)
lwz r7,_fini@got(r31)
lwz r3,main@got(r31)
b __uClibc_main@plt
#else
lis r6,_init@ha # load top 16 bits
addi r6,r6,_init@l # load bottom 16 bits
lis r7,_fini@ha # load top 16 bits
addi r7,r7,_fini@l # load bottom 16 bits
lis r3,main@ha # load top 16 bits
addi r3,r3,main@l # load bottom 16 bits
b __uClibc_main
#endif
.size _start,.-_start
/* Define a symbol for the first piece of initialized data. */
.data
.globl __data_start
__data_start:
.long 0
.weak data_start
data_start = __data_start
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