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_ARM_ASM_SUPPORT_ARM_S_ 18 #define ART_RUNTIME_ARCH_ARM_ASM_SUPPORT_ARM_S_ 19 20 #include "asm_support_arm.h" 21 22 // Define special registers. 23 24 // Register holding suspend check count down. 25 #define rSUSPEND r4 26 // Register holding Thread::Current(). 27 #define rSELF r9 28 29 .syntax unified 30 .arch armv7-a 31 .thumb 32 33 // Macro to generate the value of Runtime::Current into rDest clobbering rTemp. As it uses labels 34 // then the labels need to be unique. We bind these to the function name in the ENTRY macros. 35 .macro RUNTIME_CURRENT name, num, rDest, rTemp 36 .if .Lruntime_current\num\()_used 37 .error 38 .endif 39 .set .Lruntime_current\num\()_used, 1 40 ldr \rDest, .Lgot_\name\()_\num @ Load offset of the GOT. 41 ldr \rTemp, .Lruntime_instance_\name\()_\num @ Load GOT offset of Runtime::instance_. 42 .Lload_got_\name\()_\num\(): 43 add \rDest, pc @ Fixup GOT address. 44 ldr \rDest, [\rDest, \rTemp] @ Load address of Runtime::instance_. 45 ldr \rDest, [\rDest] @ Load Runtime::instance_. 46 .endm 47 48 // Common ENTRY declaration code for ARM and thumb, an ENTRY should always be paired with an END. 49 // Declares the RUNTIME_CURRENT[123] macros that can be used within an ENTRY and will have literals 50 // generated at END. 51 .macro DEF_ENTRY thumb_or_arm, name 52 \thumb_or_arm 53 // Clang ignores .thumb_func and requires an explicit .thumb. Investigate whether we should still 54 // carry around the .thumb_func. 55 .ifc \thumb_or_arm, .thumb_func 56 .thumb 57 .endif 58 .type \name, #function 59 .hidden \name // Hide this as a global symbol, so we do not incur plt calls. 60 .global \name 61 // Cache alignment for function entry. 62 .balign 16 63 \name: 64 .cfi_startproc 65 .fnstart 66 // Track whether RUNTIME_CURRENT was used. 67 .set .Lruntime_current1_used, 0 68 .set .Lruntime_current2_used, 0 69 .set .Lruntime_current3_used, 0 70 // The RUNTIME_CURRENT macros that are bound to the \name argument of DEF_ENTRY to ensure 71 // that label names are unique. 72 .macro RUNTIME_CURRENT1 rDest, rTemp 73 RUNTIME_CURRENT \name, 1, \rDest, \rTemp 74 .endm 75 .macro RUNTIME_CURRENT2 rDest, rTemp 76 RUNTIME_CURRENT \name, 2, \rDest, \rTemp 77 .endm 78 .macro RUNTIME_CURRENT3 rDest, rTemp 79 RUNTIME_CURRENT \name, 3, \rDest, \rTemp 80 .endm 81 .endm 82 83 // A thumb2 style ENTRY. 84 .macro ENTRY name 85 DEF_ENTRY .thumb_func, \name 86 .endm 87 88 // A ARM style ENTRY. 89 .macro ARM_ENTRY name 90 DEF_ENTRY .arm, \name 91 .endm 92 93 // Terminate an ENTRY and generate GOT references. 94 .macro END name 95 // Generate offsets of GOT and Runtime::instance_ used in RUNTIME_CURRENT. 96 .if .Lruntime_current1_used 97 .Lgot_\name\()_1: 98 .word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_1+4) 99 .Lruntime_instance_\name\()_1: 100 .word _ZN3art7Runtime9instance_E(GOT) 101 .endif 102 .if .Lruntime_current2_used 103 .Lgot_\name\()_2: 104 .word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_2+4) 105 .Lruntime_instance_\name\()_2: 106 .word _ZN3art7Runtime9instance_E(GOT) 107 .endif 108 .if .Lruntime_current3_used 109 .Lgot_\name\()_3: 110 .word _GLOBAL_OFFSET_TABLE_-(.Lload_got_\name\()_3+4) 111 .Lruntime_instance_\name\()_3: 112 .word _ZN3art7Runtime9instance_E(GOT) 113 .endif 114 // Remove the RUNTIME_CURRENTx macros so they get rebound in the next function entry. 115 .purgem RUNTIME_CURRENT1 116 .purgem RUNTIME_CURRENT2 117 .purgem RUNTIME_CURRENT3 118 .fnend 119 .cfi_endproc 120 .size \name, .-\name 121 .endm 122 123 // Declare an unimplemented ENTRY that will halt a debugger. 124 .macro UNIMPLEMENTED name 125 ENTRY \name 126 bkpt 127 bkpt 128 END \name 129 .endm 130 131 // Macros to poison (negate) the reference for heap poisoning. 132 .macro POISON_HEAP_REF rRef 133 #ifdef USE_HEAP_POISONING 134 rsb \rRef, \rRef, #0 135 #endif // USE_HEAP_POISONING 136 .endm 137 138 // Macros to unpoison (negate) the reference for heap poisoning. 139 .macro UNPOISON_HEAP_REF rRef 140 #ifdef USE_HEAP_POISONING 141 rsb \rRef, \rRef, #0 142 #endif // USE_HEAP_POISONING 143 .endm 144 145 #endif // ART_RUNTIME_ARCH_X86_ASM_SUPPORT_X86_S_ 146
