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 #if defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER) 30 // Marking Register, holding Thread::Current()->GetIsGcMarking(). 31 // Only used with the Concurrent Copying (CC) garbage 32 // collector, with the Baker read barrier configuration. 33 #define rMR r8 34 #endif 35 36 .syntax unified 37 .arch armv7-a 38 .thumb 39 40 // Macro to generate the value of Runtime::Current into rDest. As it uses labels 41 // then the labels need to be unique. We bind these to the function name in the ENTRY macros. 42 .macro RUNTIME_CURRENT name, num, rDest 43 .if .Lruntime_current\num\()_used 44 .error 45 .endif 46 .set .Lruntime_current\num\()_used, 1 47 ldr \rDest, .Lruntime_instance_\name\()_\num @ Load GOT_PREL offset of Runtime::instance_. 48 .Lload_got_\name\()_\num\(): 49 add \rDest, pc @ Fixup GOT_PREL address. 50 ldr \rDest, [\rDest] @ Load address of Runtime::instance_. 51 ldr \rDest, [\rDest] @ Load Runtime::instance_. 52 .endm 53 54 // Common ENTRY declaration code for ARM and thumb, an ENTRY should always be paired with an END. 55 // Declares the RUNTIME_CURRENT[123] macros that can be used within an ENTRY and will have literals 56 // generated at END. 57 .macro DEF_ENTRY thumb_or_arm, name 58 \thumb_or_arm 59 // Clang ignores .thumb_func and requires an explicit .thumb. Investigate whether we should still 60 // carry around the .thumb_func. 61 .ifc \thumb_or_arm, .thumb_func 62 .thumb 63 .endif 64 .type \name, #function 65 .hidden \name // Hide this as a global symbol, so we do not incur plt calls. 66 .global \name 67 // Cache alignment for function entry. 68 .balign 16 69 \name: 70 .cfi_startproc 71 .fnstart 72 // Track whether RUNTIME_CURRENT was used. 73 .set .Lruntime_current1_used, 0 74 .set .Lruntime_current2_used, 0 75 .set .Lruntime_current3_used, 0 76 // The RUNTIME_CURRENT macros that are bound to the \name argument of DEF_ENTRY to ensure 77 // that label names are unique. 78 .macro RUNTIME_CURRENT1 rDest 79 RUNTIME_CURRENT \name, 1, \rDest 80 .endm 81 .macro RUNTIME_CURRENT2 rDest 82 RUNTIME_CURRENT \name, 2, \rDest 83 .endm 84 .macro RUNTIME_CURRENT3 rDest 85 RUNTIME_CURRENT \name, 3, \rDest 86 .endm 87 .endm 88 89 // A thumb2 style ENTRY. 90 .macro ENTRY name 91 DEF_ENTRY .thumb_func, \name 92 .endm 93 94 // A ARM style ENTRY. 95 .macro ARM_ENTRY name 96 DEF_ENTRY .arm, \name 97 .endm 98 99 // Terminate an ENTRY and generate GOT_PREL references. 100 .macro END name 101 // Generate offsets of GOT and Runtime::instance_ used in RUNTIME_CURRENT. 102 .if .Lruntime_current1_used 103 .Lruntime_instance_\name\()_1: 104 .word _ZN3art7Runtime9instance_E(GOT_PREL)-(.Lload_got_\name\()_1+4) 105 .endif 106 .if .Lruntime_current2_used 107 .Lruntime_instance_\name\()_2: 108 .word _ZN3art7Runtime9instance_E(GOT_PREL)-(.Lload_got_\name\()_2+4) 109 .endif 110 .if .Lruntime_current3_used 111 .Lruntime_instance_\name\()_3: 112 .word _ZN3art7Runtime9instance_E(GOT_PREL)-(.Lload_got_\name\()_3+4) 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 // Macro 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 // Macro 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
