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 MACRO4(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4) .macro macro_name 29 #define MACRO5(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4, macro_arg5) .macro macro_name 30 #define END_MACRO .endmacro 31 32 // Clang's as(1) uses $0, $1, and so on for macro arguments. 33 #define RAW_VAR(name,index) $index 34 #define VAR(name,index) SYMBOL($index) 35 #define PLT_VAR(name, index) SYMBOL($index) 36 #define REG_VAR(name,index) %$index 37 #define CALL_MACRO(name,index) $index 38 39 // The use of $x for arguments mean that literals need to be represented with $$x in macros. 40 #define LITERAL(value) $value 41 #define MACRO_LITERAL(value) $$value 42#else 43 // Regular gas(1) lets you name macro parameters. 44 #define MACRO0(macro_name) .macro macro_name 45 #define MACRO1(macro_name, macro_arg1) .macro macro_name macro_arg1 46 #define MACRO2(macro_name, macro_arg1, macro_arg2) .macro macro_name macro_arg1, macro_arg2 47 #define MACRO3(macro_name, macro_arg1, macro_arg2, macro_arg3) .macro macro_name macro_arg1, macro_arg2, macro_arg3 48 #define MACRO4(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4) .macro macro_name macro_arg1, macro_arg2, macro_arg3, macro_arg4 49 #define MACRO5(macro_name, macro_arg1, macro_arg2, macro_arg3, macro_arg4, macro_arg5) .macro macro_name macro_arg1, macro_arg2, macro_arg3, macro_arg4, macro_arg5 50 #define END_MACRO .endm 51 52 // Regular gas(1) uses \argument_name for macro arguments. 53 // We need to turn on alternate macro syntax so we can use & instead or the preprocessor 54 // will screw us by inserting a space between the \ and the name. Even in this mode there's 55 // no special meaning to $, so literals are still just $x. The use of altmacro means % is a 56 // special character meaning care needs to be taken when passing registers as macro arguments. 57 .altmacro 58 #define RAW_VAR(name,index) name& 59 #define VAR(name,index) name& 60 #define PLT_VAR(name, index) name&@PLT 61 #define REG_VAR(name,index) %name 62 #define CALL_MACRO(name,index) name& 63 64 #define LITERAL(value) $value 65 #define MACRO_LITERAL(value) $value 66#endif 67 68#if defined(__APPLE__) 69 #define FUNCTION_TYPE(name,index) 70 #define SIZE(name,index) 71#elif defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5) 72 #define FUNCTION_TYPE(name,index) .type $index, @function 73 #define SIZE(name,index) .size $index, .-$index 74#else 75 #define FUNCTION_TYPE(name,index) .type name&, @function 76 #define SIZE(name,index) .size name, .-name 77#endif 78 79 // CFI support. 80#if !defined(__APPLE__) 81 #define CFI_STARTPROC .cfi_startproc 82 #define CFI_ENDPROC .cfi_endproc 83 #define CFI_ADJUST_CFA_OFFSET(size) .cfi_adjust_cfa_offset size 84 #define CFI_DEF_CFA(reg,size) .cfi_def_cfa reg,size 85 #define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg 86 #define CFI_RESTORE(reg) .cfi_restore reg 87 #define CFI_REL_OFFSET(reg,size) .cfi_rel_offset reg,size 88 #define CFI_RESTORE_STATE .cfi_restore_state 89 #define CFI_REMEMBER_STATE .cfi_remember_state 90#else 91 // Mac OS' doesn't like cfi_* directives. 92 #define CFI_STARTPROC 93 #define CFI_ENDPROC 94 #define CFI_ADJUST_CFA_OFFSET(size) 95 #define CFI_DEF_CFA(reg,size) 96 #define CFI_DEF_CFA_REGISTER(reg) 97 #define CFI_RESTORE(reg) 98 #define CFI_REL_OFFSET(reg,size) 99 #define CFI_RESTORE_STATE 100 #define CFI_REMEMBER_STATE 101#endif 102 103 // Symbols. 104#if !defined(__APPLE__) 105 #define SYMBOL(name) name 106 #if defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5) 107 // TODO: Disabled for old clang 3.3, this leads to text relocations and there should be a 108 // better fix. 109 #define PLT_SYMBOL(name) name // ## @PLT 110 #else 111 #define PLT_SYMBOL(name) name ## @PLT 112 #endif 113#else 114 // Mac OS' symbols have an _ prefix. 115 #define SYMBOL(name) _ ## name 116 #define PLT_SYMBOL(name) _ ## name 117#endif 118 119// Directive to hide a function symbol. 120#if defined(__APPLE__) 121 #define ASM_HIDDEN .private_extern 122#else 123 #define ASM_HIDDEN .hidden 124#endif 125 126 /* Cache alignment for function entry */ 127MACRO0(ALIGN_FUNCTION_ENTRY) 128 .balign 16 129END_MACRO 130 131MACRO1(DEFINE_FUNCTION, c_name) 132 FUNCTION_TYPE(\c_name, 0) 133 ASM_HIDDEN VAR(c_name, 0) 134 .globl VAR(c_name, 0) 135 ALIGN_FUNCTION_ENTRY 136VAR(c_name, 0): 137 CFI_STARTPROC 138 // Ensure we get a sane starting CFA. 139 CFI_DEF_CFA(esp, 4) 140END_MACRO 141 142MACRO1(END_FUNCTION, c_name) 143 CFI_ENDPROC 144 SIZE(\c_name, 0) 145END_MACRO 146 147MACRO1(PUSH, reg) 148 pushl REG_VAR(reg, 0) 149 CFI_ADJUST_CFA_OFFSET(4) 150 CFI_REL_OFFSET(REG_VAR(reg, 0), 0) 151END_MACRO 152 153MACRO1(POP, reg) 154 popl REG_VAR(reg,0) 155 CFI_ADJUST_CFA_OFFSET(-4) 156 CFI_RESTORE(REG_VAR(reg,0)) 157END_MACRO 158 159MACRO1(UNIMPLEMENTED,name) 160 FUNCTION_TYPE(\name, 0) 161 .globl VAR(name, 0) 162 ALIGN_FUNCTION_ENTRY 163VAR(name, 0): 164 CFI_STARTPROC 165 int3 166 int3 167 CFI_ENDPROC 168 SIZE(\name, 0) 169END_MACRO 170 171MACRO1(SETUP_GOT_NOSAVE, got_reg) 172#ifndef __APPLE__ 173 .ifc RAW_VAR(got_reg, 0), ebx 174 call __x86.get_pc_thunk.bx 175 addl $_GLOBAL_OFFSET_TABLE_, %ebx 176 .else 177 .error "Unknown GOT register \got_reg" 178 .endif 179#endif 180END_MACRO 181 182#endif // ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_ 183