begin.S revision 40ad229b25671b43dc1cef29ecd5a7807aed5192
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__start: 50 .set noreorder 51 bal 1f 52 nop 531: 54#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 55 .cpload ra 56#else 57 .cpsetup ra, $0, 1b 58#endif 59 .set reorder 60 61 /* Discover the load address */ 62 LA t0, 1b 63 PTR_SUBU t0, ra, t0 64 65#define DT_PLTGOT 3 66#define DT_MIPS_LOCAL_GOTNO 0x7000000a 67 68 /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */ 69 LA t1, _DYNAMIC 70 PTR_ADDU t1, t0 71 LI t3, DT_PLTGOT 72 LI ta0, DT_MIPS_LOCAL_GOTNO 730: 74 REG_L t2, ELF_DYN_TAG(t1) 75 beqz t2, .Lrelocate_local_got 76 77 bne t2, t3, 1f /* DT_PLTGOT? */ 78 REG_L s0, ELF_DYN_VAL(t1) 79 PTR_ADDU s0, t0 80 b 2f 81 821: 83 bne t2, ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */ 84 REG_L s1, ELF_DYN_VAL(t1) 85 862: PTR_ADDU t1, ELF_DYNSZ 87 b 0b 88 89.Lrelocate_local_got: 90 /* 91 * Relocate the local GOT entries 92 * got[0] is address of lazy resolver function 93 * got[1] may be used for a GNU extension 94 */ 95 96 PTR_ADDU s0, GOTENT_SZ 97 SUBU s1, 1 98 PTR_L t1, (s0) 99 bgez t1, 9f 100 PTR_ADDU s0, GOTENT_SZ 101 SUBU s1, 1 102 b 9f 103 1041: PTR_L t1, (s0) 105 PTR_ADDU t1, t0 106 PTR_S t1, (s0) 107 PTR_ADDU s0, GOTENT_SZ 1089: SUBU s1, 1 109 bgez s1, 1b 110 111 /* call linker_init */ 112 move a0, sp 113#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 114 PTR_SUBU sp, 4*REGSZ /* space for arg saves in linker_init */ 115#endif 116 jal __linker_init 117#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32) 118 PTR_ADDU sp, 4*REGSZ /* restore sp */ 119#endif 120 move t9, v0 121 j t9 122 .end __start 123