asm_support_x86.S revision 907194a395ffa5bc27cad81adbed241f9fd772f0
1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_ 18#define ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_ 19 20#include "asm_support_x86.h" 21 22#if defined(__APPLE__) || (defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5)) 23 // Clang's as(1) doesn't let you name macro parameters prior to 3.5. 24 #define MACRO0(macro_name) .macro macro_name 25 #define MACRO1(macro_name, macro_arg1) .macro macro_name 26 #define MACRO2(macro_name, macro_arg1, macro_args2) .macro macro_name 27 #define MACRO3(macro_name, macro_arg1, macro_args2, macro_args3) .macro macro_name 28 #define END_MACRO .endmacro 29 30 // Clang's as(1) uses $0, $1, and so on for macro arguments. 31 #define RAW_VAR(name,index) $index 32 #define VAR(name,index) SYMBOL($index) 33 #define PLT_VAR(name, index) SYMBOL($index) 34 #define REG_VAR(name,index) %$index 35 #define CALL_MACRO(name,index) $index 36 37 // The use of $x for arguments mean that literals need to be represented with $$x in macros. 38 #define LITERAL(value) $value 39 #define MACRO_LITERAL(value) $$value 40#else 41 // Regular gas(1) lets you name macro parameters. 42 #define MACRO0(macro_name) .macro macro_name 43 #define MACRO1(macro_name, macro_arg1) .macro macro_name macro_arg1 44 #define MACRO2(macro_name, macro_arg1, macro_arg2) .macro macro_name macro_arg1, macro_arg2 45 #define MACRO3(macro_name, macro_arg1, macro_arg2, macro_arg3) .macro macro_name macro_arg1, macro_arg2, macro_arg3 46 #define END_MACRO .endm 47 48 // Regular gas(1) uses \argument_name for macro arguments. 49 // We need to turn on alternate macro syntax so we can use & instead or the preprocessor 50 // will screw us by inserting a space between the \ and the name. Even in this mode there's 51 // no special meaning to $, so literals are still just $x. The use of altmacro means % is a 52 // special character meaning care needs to be taken when passing registers as macro arguments. 53 .altmacro 54 #define RAW_VAR(name,index) name& 55 #define VAR(name,index) name& 56 #define PLT_VAR(name, index) name&@PLT 57 #define REG_VAR(name,index) %name 58 #define CALL_MACRO(name,index) name& 59 60 #define LITERAL(value) $value 61 #define MACRO_LITERAL(value) $value 62#endif 63 64#if defined(__APPLE__) 65 #define FUNCTION_TYPE(name,index) 66 #define SIZE(name,index) 67#elif defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5) 68 #define FUNCTION_TYPE(name,index) .type $index, @function 69 #define SIZE(name,index) .size $index, .-$index 70#else 71 #define FUNCTION_TYPE(name,index) .type name&, @function 72 #define SIZE(name,index) .size name, .-name 73#endif 74 75 // CFI support. 76#if !defined(__APPLE__) 77 #define CFI_STARTPROC .cfi_startproc 78 #define CFI_ENDPROC .cfi_endproc 79 #define CFI_ADJUST_CFA_OFFSET(size) .cfi_adjust_cfa_offset size 80 #define CFI_DEF_CFA(reg,size) .cfi_def_cfa reg,size 81 #define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 82 #define CFI_RESTORE(reg) .cfi_restore reg 83 #define CFI_REL_OFFSET(reg,size) .cfi_rel_offset reg,size 84 #define CFI_RESTORE_STATE .cfi_restore_state 85 #define CFI_REMEMBER_STATE .cfi_remember_state 86#else 87 // Mac OS' doesn't like cfi_* directives. 88 #define CFI_STARTPROC 89 #define CFI_ENDPROC 90 #define CFI_ADJUST_CFA_OFFSET(size) 91 #define CFI_DEF_CFA(reg,size) 92 #define CFI_DEF_CFA_REGISTER(reg) 93 #define CFI_RESTORE(reg) 94 #define CFI_REL_OFFSET(reg,size) 95 #define CFI_RESTORE_STATE 96 #define CFI_REMEMBER_STATE 97#endif 98 99 // Symbols. 100#if !defined(__APPLE__) 101 #define SYMBOL(name) name 102 #if defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5) 103 // TODO: Disabled for old clang 3.3, this leads to text relocations and there should be a 104 // better fix. 105 #define PLT_SYMBOL(name) name // ## @PLT 106 #else 107 #define PLT_SYMBOL(name) name ## @PLT 108 #endif 109#else 110 // Mac OS' symbols have an _ prefix. 111 #define SYMBOL(name) _ ## name 112 #define PLT_SYMBOL(name) _ ## name 113#endif 114 115 /* Cache alignment for function entry */ 116MACRO0(ALIGN_FUNCTION_ENTRY) 117 .balign 16 118END_MACRO 119 120MACRO1(DEFINE_FUNCTION, c_name) 121 FUNCTION_TYPE(\c_name, 0) 122 .globl VAR(c_name, 0) 123 ALIGN_FUNCTION_ENTRY 124VAR(c_name, 0): 125 CFI_STARTPROC 126 // Ensure we get a sane starting CFA. 127 CFI_DEF_CFA(esp, 4) 128END_MACRO 129 130MACRO1(END_FUNCTION, c_name) 131 CFI_ENDPROC 132 SIZE(\c_name, 0) 133END_MACRO 134 135MACRO1(PUSH, reg) 136 pushl REG_VAR(reg, 0) 137 CFI_ADJUST_CFA_OFFSET(4) 138 CFI_REL_OFFSET(REG_VAR(reg, 0), 0) 139END_MACRO 140 141MACRO1(POP, reg) 142 popl REG_VAR(reg,0) 143 CFI_ADJUST_CFA_OFFSET(-4) 144 CFI_RESTORE(REG_VAR(reg,0)) 145END_MACRO 146 147MACRO1(UNIMPLEMENTED,name) 148 FUNCTION_TYPE(\name, 0) 149 .globl VAR(name, 0) 150 ALIGN_FUNCTION_ENTRY 151VAR(name, 0): 152 CFI_STARTPROC 153 int3 154 int3 155 CFI_ENDPROC 156 SIZE(\name, 0) 157END_MACRO 158 159MACRO0(SETUP_GOT_NOSAVE) 160#ifndef __APPLE__ 161 call __x86.get_pc_thunk.bx 162 addl $_GLOBAL_OFFSET_TABLE_, %ebx 163#endif 164END_MACRO 165 166MACRO0(SETUP_GOT) 167 PUSH ebx 168 SETUP_GOT_NOSAVE 169END_MACRO 170 171MACRO0(UNDO_SETUP_GOT) 172 POP ebx 173END_MACRO 174 175#endif // ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_ 176