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 .align 4 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 55 1: 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 75 0: 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 84 1: 85 bne t2, ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */ 86 REG_L s1, ELF_DYN_VAL(t1) 87 88 2: 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 105 106 1: PTR_L t1, (s0) 107 PTR_ADDU t1, t0 108 PTR_S t1, (s0) 109 PTR_ADDU s0, GOTENT_SZ 110 9: 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
