1 /* 2 * Copyright (C) 2013 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 #pragma once 30 31 /* https://github.com/android/ndk/issues/1422 */ 32 #include <features.h> 33 34 #include <asm/unistd.h> /* For system call numbers. */ 35 #define MAX_ERRNO 4095 /* For recognizing system call error returns. */ 36 37 #define __bionic_asm_custom_entry(f) 38 #define __bionic_asm_custom_end(f) 39 #define __bionic_asm_function_type @function 40 #define __bionic_asm_custom_note_gnu_section() 41 42 #if defined(__aarch64__) 43 #include <private/bionic_asm_arm64.h> 44 #elif defined(__arm__) 45 #include <private/bionic_asm_arm.h> 46 #elif defined(__i386__) 47 #include <private/bionic_asm_x86.h> 48 #elif defined(__riscv) 49 #include <private/bionic_asm_riscv64.h> 50 #elif defined(__x86_64__) 51 #include <private/bionic_asm_x86_64.h> 52 #endif 53 54 // Starts a normal assembler routine. 55 #define ENTRY(__f) __ENTRY_WITH_BINDING(__f, .globl) 56 57 // Starts an assembler routine with hidden visibility. 58 #define ENTRY_PRIVATE(__f) \ 59 __ENTRY_WITH_BINDING(__f, .globl); \ 60 .hidden __f; 61 62 // Starts an assembler routine that's weak so native bridges can override it. 63 #define ENTRY_WEAK_FOR_NATIVE_BRIDGE(__f) __ENTRY_WITH_BINDING(__f, .weak) 64 65 // Starts an assembler routine with hidden visibility and no DWARF information. 66 // Only used for internal functions passed via sa_restorer. 67 // TODO: can't we just delete all those and let the kernel do its thing? 68 #define ENTRY_NO_DWARF_PRIVATE(__f) \ 69 __ENTRY_NO_DWARF(__f, .globl); \ 70 .hidden __f; 71 72 // (Implementation detail.) 73 #define __ENTRY_NO_DWARF(__f, __binding) \ 74 .text; \ 75 __binding __f; \ 76 .balign __bionic_asm_align; \ 77 .type __f, __bionic_asm_function_type; \ 78 __f: \ 79 __bionic_asm_custom_entry(__f); 80 81 // (Implementation detail.) 82 #define __ENTRY_WITH_BINDING(__f, __binding) \ 83 __ENTRY_NO_DWARF(__f, __binding); \ 84 .cfi_startproc; 85 86 // Ends a normal assembler routine. 87 #define END(__f) \ 88 .cfi_endproc; \ 89 END_NO_DWARF(__f) 90 91 // Ends an assembler routine with no DWARF information. 92 // Only used for internal functions passed via sa_restorer. 93 // TODO: can't we just delete all those and let the kernel do its thing? 94 #define END_NO_DWARF(__f) \ 95 .size __f, .- __f; \ 96 __bionic_asm_custom_end(__f) 97 98 // Creates an alias `alias` for the symbol `original`. 99 #define ALIAS_SYMBOL(alias, original) \ 100 .globl alias; \ 101 .equ alias, original 102 103 // Creates an alias `alias` for the symbol `original` that's weak so it can be 104 // separately overridden by native bridges. 105 #define ALIAS_SYMBOL_WEAK_FOR_NATIVE_BRIDGE(alias, original) \ 106 .weak alias; \ 107 .equ alias, original 108 109 // Adds a GNU property ELF note. Important on arm64 to declare PAC/BTI support. 110 #define NOTE_GNU_PROPERTY() __bionic_asm_custom_note_gnu_section() 111 112 // Gives local labels a more convenient and readable syntax. 113 #define L(__label) .L##__label 114