| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2003 by Erik Andersen |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU Library General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Library General Public License |
| 15 | * along with this program; if not, write to the Free Software Foundation, |
| 16 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | #include <features.h> |
| 20 | /* Integer registers. */ |
| 21 | #define r0 0 |
| 22 | #define r1 1 |
| 23 | #define r2 2 |
| 24 | #define r3 3 |
| 25 | #define r4 4 |
| 26 | #define r5 5 |
| 27 | #define r6 6 |
| 28 | #define r7 7 |
| 29 | #define r8 8 |
| 30 | #define r9 9 |
| 31 | #define r10 10 |
| 32 | #define r13 13 |
| 33 | #define r31 31 |
| 34 | |
| 35 | .text |
| 36 | .globl _start |
| 37 | .type _start,%function |
| 38 | .type _init,%function |
| 39 | .type _fini,%function |
| 40 | #ifndef __UCLIBC_CTOR_DTOR__ |
| 41 | .weak _init |
| 42 | .weak _fini |
| 43 | #endif |
| 44 | .type main,%function |
| 45 | .type __uClibc_main,%function |
| 46 | |
| 47 | _start: |
| 48 | mr r9,r1 /* Save the stack pointer and pass it to __uClibc_main */ |
| 49 | clrrwi r1,r1,4 /* Align stack ptr to 16 bytes */ |
| 50 | #ifdef __PIC__ |
| 51 | # ifdef HAVE_ASM_PPC_REL16 |
| 52 | bcl 20,31,1f |
| 53 | 1: mflr r31 |
| 54 | addis r31,r31,_GLOBAL_OFFSET_TABLE_-1b@ha |
| 55 | addi r31,r31,_GLOBAL_OFFSET_TABLE_-1b@l |
| 56 | # else |
| 57 | bl _GLOBAL_OFFSET_TABLE_-4@local |
| 58 | mflr r31 |
| 59 | # endif |
| 60 | #endif |
| 61 | /* Set up the small data pointer in r13. */ |
| 62 | #ifdef __PIC__ |
| 63 | lwz r13,_SDA_BASE_@got(r31) |
| 64 | #else |
| 65 | lis r13,_SDA_BASE_@ha |
| 66 | addi r13,r13,_SDA_BASE_@l |
| 67 | #endif |
| 68 | /* Set up an initial stack frame, and clear the LR. */ |
| 69 | li r0,0 |
| 70 | stwu r1,-16(r1) |
| 71 | mtlr r0 |
| 72 | stw r0,0(r1) |
| 73 | /* find argc from the stack pointer */ |
| 74 | lwz r4,0(r9) |
| 75 | /* find argv one word offset from the stack pointer */ |
| 76 | addi r5,r9,4 |
| 77 | mr r8,r3 /* Pass _dl_fini from ldso or NULL if statically linked */ |
| 78 | /* Note: PPC depends on the kernel to zero r3 before */ |
| 79 | /* handing over to user space, otherwise static apps */ |
| 80 | /* will SEGV during exit() */ |
| 81 | |
| 82 | /* Ok, now run uClibc's main() -- shouldn't return */ |
| 83 | #ifdef __PIC__ |
| 84 | lwz r6,_init@got(r31) |
| 85 | lwz r7,_fini@got(r31) |
| 86 | lwz r3,main@got(r31) |
| 87 | b __uClibc_main@plt |
| 88 | #else |
| 89 | lis r6,_init@ha # load top 16 bits |
| 90 | addi r6,r6,_init@l # load bottom 16 bits |
| 91 | lis r7,_fini@ha # load top 16 bits |
| 92 | addi r7,r7,_fini@l # load bottom 16 bits |
| 93 | lis r3,main@ha # load top 16 bits |
| 94 | addi r3,r3,main@l # load bottom 16 bits |
| 95 | b __uClibc_main |
| 96 | #endif |
| 97 | |
| 98 | .size _start,.-_start |
| 99 | |
| 100 | /* Define a symbol for the first piece of initialized data. */ |
| 101 | .data |
| 102 | .globl __data_start |
| 103 | __data_start: |
| 104 | .long 0 |
| 105 | .weak data_start |
| 106 | data_start = __data_start |
| 107 | |