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
DoubleImmedVmov() const13 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
Name(int reg,bool is_double)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
Number(const char * name,bool * is_double)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
Number(const char * name)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