1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <private/bionic_asm.h> 30 31#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 32#define ELF_DYNSZ 8 33#define ELF_DYN_TAG 0 34#define ELF_DYN_VAL 4 35#define GOTENT_SZ 4 36#else 37#define ELF_DYNSZ 16 38#define ELF_DYN_TAG 0 39#define ELF_DYN_VAL 8 40#define GOTENT_SZ 8 41#endif 42 43 .text 44 .balign 16 45 .type __start,@function 46 47 .ent __start 48 .globl __start 49 .globl _start 50__start: 51_start: 52 .set noreorder 53 bal 1f 54 nop 551: 56#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 57 .cpload $ra 58#else 59 .cpsetup $ra, $0, 1b 60#endif 61 .set reorder 62 63 /* Discover the load address */ 64 LA $t0, 1b 65 PTR_SUBU $t0, $ra, $t0 66 67#define DT_PLTGOT 3 68#define DT_MIPS_LOCAL_GOTNO 0x7000000a 69 70 /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */ 71 LA $t1, _DYNAMIC 72 PTR_ADDU $t1, $t0 73 LI $t3, DT_PLTGOT 74 LI $ta0, DT_MIPS_LOCAL_GOTNO 750: 76 REG_L $t2, ELF_DYN_TAG($t1) 77 beqz $t2, .Lrelocate_local_got 78 79 bne $t2, $t3, 1f /* DT_PLTGOT? */ 80 REG_L $s0, ELF_DYN_VAL($t1) 81 PTR_ADDU $s0, $t0 82 b 2f 83 841: 85 bne $t2, $ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */ 86 REG_L $s1, ELF_DYN_VAL($t1) 87 882: PTR_ADDU $t1, ELF_DYNSZ 89 b 0b 90 91.Lrelocate_local_got: 92 /* 93 * Relocate the local GOT entries 94 * got[0] is address of lazy resolver function 95 * got[1] may be used for a GNU extension 96 */ 97 98 PTR_ADDU $s0, GOTENT_SZ 99 SUBU $s1, 1 100 PTR_L $t1, ($s0) 101 bgez $t1, 9f 102 PTR_ADDU $s0, GOTENT_SZ 103 SUBU $s1, 1 104 b 9f 105 1061: PTR_L $t1, ($s0) 107 PTR_ADDU $t1, $t0 108 PTR_S $t1, ($s0) 109 PTR_ADDU $s0, GOTENT_SZ 1109: SUBU $s1, 1 111 bgez $s1, 1b 112 113 /* call linker_init */ 114 move $a0, $sp 115#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 116 PTR_SUBU $sp, 4*REGSZ /* space for arg saves in linker_init */ 117#endif 118 jal __linker_init 119#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 120 PTR_ADDU $sp, 4*REGSZ /* restore sp */ 121#endif 122 move $t9, $v0 123 j $t9 124 .end __start 125