1 // Copyright 2009 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #if V8_TARGET_ARCH_ARM 6 7 #include "src/arm/constants-arm.h" 8 9 10 namespace v8 { 11 namespace internal { 12 13 double Instruction::DoubleImmedVmov() const { 14 // Reconstruct a double from the immediate encoded in the vmov instruction. 15 // 16 // instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh] 17 // double: [aBbbbbbb,bbcdefgh,00000000,00000000, 18 // 00000000,00000000,00000000,00000000] 19 // 20 // where B = ~b. Only the high 16 bits are affected. 21 uint64_t high16; 22 high16 = (Bits(17, 16) << 4) | Bits(3, 0); // xxxxxxxx,xxcdefgh. 23 high16 |= (0xff * Bit(18)) << 6; // xxbbbbbb,bbxxxxxx. 24 high16 |= (Bit(18) ^ 1) << 14; // xBxxxxxx,xxxxxxxx. 25 high16 |= Bit(19) << 15; // axxxxxxx,xxxxxxxx. 26 27 uint64_t imm = high16 << 48; 28 double d; 29 memcpy(&d, &imm, 8); 30 return d; 31 } 32 33 34 // These register names are defined in a way to match the native disassembler 35 // formatting. See for example the command "objdump -d <binary file>". 36 const char* Registers::names_[kNumRegisters] = { 37 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 38 "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc", 39 }; 40 41 42 // List of alias names which can be used when referring to ARM registers. 43 const Registers::RegisterAlias Registers::aliases_[] = { 44 {10, "sl"}, 45 {11, "r11"}, 46 {12, "r12"}, 47 {13, "r13"}, 48 {14, "r14"}, 49 {15, "r15"}, 50 {kNoRegister, NULL} 51 }; 52 53 54 // Support for VFP registers s0 to s31 (d0 to d15) and d16-d31. 55 // Note that "sN:sM" is the same as "dN/2" up to d15. 56 // These register names are defined in a way to match the native disassembler 57 // formatting. See for example the command "objdump -d <binary file>". 58 const char* VFPRegisters::names_[kNumVFPRegisters] = { 59 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", 60 "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", 61 "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", 62 "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", 63 "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", 64 "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", 65 "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", 66 "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31" 67 }; 68 69 70 const char* VFPRegisters::Name(int reg, bool is_double) { 71 DCHECK((0 <= reg) && (reg < kNumVFPRegisters)); 72 return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)]; 73 } 74 75 76 int VFPRegisters::Number(const char* name, bool* is_double) { 77 for (int i = 0; i < kNumVFPRegisters; i++) { 78 if (strcmp(names_[i], name) == 0) { 79 if (i < kNumVFPSingleRegisters) { 80 *is_double = false; 81 return i; 82 } else { 83 *is_double = true; 84 return i - kNumVFPSingleRegisters; 85 } 86 } 87 } 88 89 // No register with the requested name found. 90 return kNoRegister; 91 } 92 93 94 int Registers::Number(const char* name) { 95 // Look through the canonical names. 96 for (int i = 0; i < kNumRegisters; i++) { 97 if (strcmp(names_[i], name) == 0) { 98 return i; 99 } 100 } 101 102 // Look through the alias names. 103 int i = 0; 104 while (aliases_[i].reg != kNoRegister) { 105 if (strcmp(aliases_[i].name, name) == 0) { 106 return aliases_[i].reg; 107 } 108 i++; 109 } 110 111 // No register with the requested name found. 112 return kNoRegister; 113 } 114 115 116 } // namespace internal 117 } // namespace v8 118 119 #endif // V8_TARGET_ARCH_ARM 120
