Constants-arm.cpp (3801B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 */ 4 // Copyright 2009 the V8 project authors. All rights reserved. 5 // Use of this source code is governed by a BSD-style license that can be 6 // found in the LICENSE file. 7 8 #include "jit/arm/disasm/Constants-arm.h" 9 10 #ifdef JS_DISASM_ARM 11 12 namespace js { 13 namespace jit { 14 namespace disasm { 15 16 double Instruction::DoubleImmedVmov() const { 17 // Reconstruct a double from the immediate encoded in the vmov instruction. 18 // 19 // instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh] 20 // double: [aBbbbbbb,bbcdefgh,00000000,00000000, 21 // 00000000,00000000,00000000,00000000] 22 // 23 // where B = ~b. Only the high 16 bits are affected. 24 uint64_t high16; 25 high16 = (Bits(17, 16) << 4) | Bits(3, 0); // xxxxxxxx,xxcdefgh. 26 high16 |= (0xff * Bit(18)) << 6; // xxbbbbbb,bbxxxxxx. 27 high16 |= (Bit(18) ^ 1) << 14; // xBxxxxxx,xxxxxxxx. 28 high16 |= Bit(19) << 15; // axxxxxxx,xxxxxxxx. 29 30 uint64_t imm = high16 << 48; 31 double d; 32 memcpy(&d, &imm, 8); 33 return d; 34 } 35 36 // These register names are defined in a way to match the native disassembler 37 // formatting. See for example the command "objdump -d <binary file>". 38 const char* Registers::names_[kNumRegisters] = { 39 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 40 "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc", 41 }; 42 43 // List of alias names which can be used when referring to ARM registers. 44 const Registers::RegisterAlias Registers::aliases_[] = { 45 {10, "sl"}, {11, "r11"}, {12, "r12"}, {13, "r13"}, 46 {14, "r14"}, {15, "r15"}, {kNoRegister, NULL}}; 47 48 const char* Registers::Name(int reg) { 49 const char* result; 50 if ((0 <= reg) && (reg < kNumRegisters)) { 51 result = names_[reg]; 52 } else { 53 result = "noreg"; 54 } 55 return result; 56 } 57 58 // Support for VFP registers s0 to s31 (d0 to d15) and d16-d31. 59 // Note that "sN:sM" is the same as "dN/2" up to d15. 60 // These register names are defined in a way to match the native disassembler 61 // formatting. See for example the command "objdump -d <binary file>". 62 const char* VFPRegisters::names_[kNumVFPRegisters] = { 63 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", "s8", "s9", "s10", 64 "s11", "s12", "s13", "s14", "s15", "s16", "s17", "s18", "s19", "s20", "s21", 65 "s22", "s23", "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", "d0", 66 "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "d10", "d11", 67 "d12", "d13", "d14", "d15", "d16", "d17", "d18", "d19", "d20", "d21", "d22", 68 "d23", "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"}; 69 70 const char* VFPRegisters::Name(int reg, bool is_double) { 71 MOZ_ASSERT((0 <= reg) && (reg < kNumVFPRegisters)); 72 return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)]; 73 } 74 75 int VFPRegisters::Number(const char* name, bool* is_double) { 76 for (int i = 0; i < kNumVFPRegisters; i++) { 77 if (strcmp(names_[i], name) == 0) { 78 if (i < kNumVFPSingleRegisters) { 79 *is_double = false; 80 return i; 81 } else { 82 *is_double = true; 83 return i - kNumVFPSingleRegisters; 84 } 85 } 86 } 87 88 // No register with the requested name found. 89 return kNoRegister; 90 } 91 92 int Registers::Number(const char* name) { 93 // Look through the canonical names. 94 for (int i = 0; i < kNumRegisters; i++) { 95 if (strcmp(names_[i], name) == 0) { 96 return i; 97 } 98 } 99 100 // Look through the alias names. 101 int i = 0; 102 while (aliases_[i].reg != kNoRegister) { 103 if (strcmp(aliases_[i].name, name) == 0) { 104 return aliases_[i].reg; 105 } 106 i++; 107 } 108 109 // No register with the requested name found. 110 return kNoRegister; 111 } 112 113 } // namespace disasm 114 } // namespace jit 115 } // namespace js 116 117 #endif // JS_DISASM_ARM