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#include "src/v8.h"
6
7#if V8_TARGET_ARCH_ARM
8
9#include "src/arm/constants-arm.h"
10
11
12namespace v8 {
13namespace internal {
14
15double Instruction::DoubleImmedVmov() const {
16  // Reconstruct a double from the immediate encoded in the vmov instruction.
17  //
18  //   instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh]
19  //   double: [aBbbbbbb,bbcdefgh,00000000,00000000,
20  //            00000000,00000000,00000000,00000000]
21  //
22  // where B = ~b. Only the high 16 bits are affected.
23  uint64_t high16;
24  high16  = (Bits(17, 16) << 4) | Bits(3, 0);   // xxxxxxxx,xxcdefgh.
25  high16 |= (0xff * Bit(18)) << 6;              // xxbbbbbb,bbxxxxxx.
26  high16 |= (Bit(18) ^ 1) << 14;                // xBxxxxxx,xxxxxxxx.
27  high16 |= Bit(19) << 15;                      // axxxxxxx,xxxxxxxx.
28
29  uint64_t imm = high16 << 48;
30  double d;
31  memcpy(&d, &imm, 8);
32  return d;
33}
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>".
38const 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
44// List of alias names which can be used when referring to ARM registers.
45const Registers::RegisterAlias Registers::aliases_[] = {
46  {10, "sl"},
47  {11, "r11"},
48  {12, "r12"},
49  {13, "r13"},
50  {14, "r14"},
51  {15, "r15"},
52  {kNoRegister, NULL}
53};
54
55
56const char* Registers::Name(int reg) {
57  const char* result;
58  if ((0 <= reg) && (reg < kNumRegisters)) {
59    result = names_[reg];
60  } else {
61    result = "noreg";
62  }
63  return result;
64}
65
66
67// Support for VFP registers s0 to s31 (d0 to d15) and d16-d31.
68// Note that "sN:sM" is the same as "dN/2" up to d15.
69// These register names are defined in a way to match the native disassembler
70// formatting. See for example the command "objdump -d <binary file>".
71const char* VFPRegisters::names_[kNumVFPRegisters] = {
72    "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
73    "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
74    "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
75    "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
76    "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
77    "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
78    "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
79    "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
80};
81
82
83const char* VFPRegisters::Name(int reg, bool is_double) {
84  DCHECK((0 <= reg) && (reg < kNumVFPRegisters));
85  return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)];
86}
87
88
89int VFPRegisters::Number(const char* name, bool* is_double) {
90  for (int i = 0; i < kNumVFPRegisters; i++) {
91    if (strcmp(names_[i], name) == 0) {
92      if (i < kNumVFPSingleRegisters) {
93        *is_double = false;
94        return i;
95      } else {
96        *is_double = true;
97        return i - kNumVFPSingleRegisters;
98      }
99    }
100  }
101
102  // No register with the requested name found.
103  return kNoRegister;
104}
105
106
107int Registers::Number(const char* name) {
108  // Look through the canonical names.
109  for (int i = 0; i < kNumRegisters; i++) {
110    if (strcmp(names_[i], name) == 0) {
111      return i;
112    }
113  }
114
115  // Look through the alias names.
116  int i = 0;
117  while (aliases_[i].reg != kNoRegister) {
118    if (strcmp(aliases_[i].name, name) == 0) {
119      return aliases_[i].reg;
120    }
121    i++;
122  }
123
124  // No register with the requested name found.
125  return kNoRegister;
126}
127
128
129} }  // namespace v8::internal
130
131#endif  // V8_TARGET_ARCH_ARM
132