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/codegen/arm/constants-arm.h"
8
9 namespace v8 {
10 namespace internal {
11
DoubleImmedVmov() const12 Float64 Instruction::DoubleImmedVmov() const {
13 // Reconstruct a double from the immediate encoded in the vmov instruction.
14 //
15 // instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh]
16 // double: [aBbbbbbb,bbcdefgh,00000000,00000000,
17 // 00000000,00000000,00000000,00000000]
18 //
19 // where B = ~b. Only the high 16 bits are affected.
20 uint64_t high16;
21 high16 = (Bits(17, 16) << 4) | Bits(3, 0); // xxxxxxxx,xxcdefgh.
22 high16 |= (0xFF * Bit(18)) << 6; // xxbbbbbb,bbxxxxxx.
23 high16 |= (Bit(18) ^ 1) << 14; // xBxxxxxx,xxxxxxxx.
24 high16 |= Bit(19) << 15; // axxxxxxx,xxxxxxxx.
25
26 uint64_t imm = high16 << 48;
27 return Float64::FromBits(imm);
28 }
29
30 // These register names are defined in a way to match the native disassembler
31 // formatting. See for example the command "objdump -d <binary file>".
32 const char* Registers::names_[kNumRegisters] = {
33 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
34 "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc",
35 };
36
37 // List of alias names which can be used when referring to ARM registers.
38 const Registers::RegisterAlias Registers::aliases_[] = {
39 {10, "sl"}, {11, "r11"}, {12, "r12"}, {13, "r13"},
40 {14, "r14"}, {15, "r15"}, {kNoRegister, nullptr}};
41
42 // Support for VFP registers s0 to s31 (d0 to d15) and d16-d31.
43 // Note that "sN:sM" is the same as "dN/2" up to d15.
44 // These register names are defined in a way to match the native disassembler
45 // formatting. See for example the command "objdump -d <binary file>".
46 const char* VFPRegisters::names_[kNumVFPRegisters] = {
47 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", "s8", "s9", "s10",
48 "s11", "s12", "s13", "s14", "s15", "s16", "s17", "s18", "s19", "s20", "s21",
49 "s22", "s23", "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", "d0",
50 "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "d10", "d11",
51 "d12", "d13", "d14", "d15", "d16", "d17", "d18", "d19", "d20", "d21", "d22",
52 "d23", "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"};
53
Name(int reg,bool is_double)54 const char* VFPRegisters::Name(int reg, bool is_double) {
55 DCHECK((0 <= reg) && (reg < kNumVFPRegisters));
56 return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)];
57 }
58
Number(const char * name,bool * is_double)59 int VFPRegisters::Number(const char* name, bool* is_double) {
60 for (int i = 0; i < kNumVFPRegisters; i++) {
61 if (strcmp(names_[i], name) == 0) {
62 if (i < kNumVFPSingleRegisters) {
63 *is_double = false;
64 return i;
65 } else {
66 *is_double = true;
67 return i - kNumVFPSingleRegisters;
68 }
69 }
70 }
71
72 // No register with the requested name found.
73 return kNoRegister;
74 }
75
Number(const char * name)76 int Registers::Number(const char* name) {
77 // Look through the canonical names.
78 for (int i = 0; i < kNumRegisters; i++) {
79 if (strcmp(names_[i], name) == 0) {
80 return i;
81 }
82 }
83
84 // Look through the alias names.
85 int i = 0;
86 while (aliases_[i].reg != kNoRegister) {
87 if (strcmp(aliases_[i].name, name) == 0) {
88 return aliases_[i].reg;
89 }
90 i++;
91 }
92
93 // No register with the requested name found.
94 return kNoRegister;
95 }
96
97 } // namespace internal
98 } // namespace v8
99
100 #endif // V8_TARGET_ARCH_ARM
101