/* * 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 .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 #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