1// Copyright 2009 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include "v8.h"
29
30#if defined(V8_TARGET_ARCH_ARM)
31
32#include "constants-arm.h"
33
34
35namespace v8 {
36namespace internal {
37
38double Instruction::DoubleImmedVmov() const {
39  // Reconstruct a double from the immediate encoded in the vmov instruction.
40  //
41  //   instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh]
42  //   double: [aBbbbbbb,bbcdefgh,00000000,00000000,
43  //            00000000,00000000,00000000,00000000]
44  //
45  // where B = ~b. Only the high 16 bits are affected.
46  uint64_t high16;
47  high16  = (Bits(17, 16) << 4) | Bits(3, 0);   // xxxxxxxx,xxcdefgh.
48  high16 |= (0xff * Bit(18)) << 6;              // xxbbbbbb,bbxxxxxx.
49  high16 |= (Bit(18) ^ 1) << 14;                // xBxxxxxx,xxxxxxxx.
50  high16 |= Bit(19) << 15;                      // axxxxxxx,xxxxxxxx.
51
52  uint64_t imm = high16 << 48;
53  double d;
54  memcpy(&d, &imm, 8);
55  return d;
56}
57
58
59// These register names are defined in a way to match the native disassembler
60// formatting. See for example the command "objdump -d <binary file>".
61const char* Registers::names_[kNumRegisters] = {
62  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
63  "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc",
64};
65
66
67// List of alias names which can be used when referring to ARM registers.
68const Registers::RegisterAlias Registers::aliases_[] = {
69  {10, "sl"},
70  {11, "r11"},
71  {12, "r12"},
72  {13, "r13"},
73  {14, "r14"},
74  {15, "r15"},
75  {kNoRegister, NULL}
76};
77
78
79const char* Registers::Name(int reg) {
80  const char* result;
81  if ((0 <= reg) && (reg < kNumRegisters)) {
82    result = names_[reg];
83  } else {
84    result = "noreg";
85  }
86  return result;
87}
88
89
90// Support for VFP registers s0 to s31 (d0 to d15).
91// Note that "sN:sM" is the same as "dN/2"
92// These register names are defined in a way to match the native disassembler
93// formatting. See for example the command "objdump -d <binary file>".
94const char* VFPRegisters::names_[kNumVFPRegisters] = {
95    "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
96    "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
97    "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
98    "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
99    "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
100    "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15"
101};
102
103
104const char* VFPRegisters::Name(int reg, bool is_double) {
105  ASSERT((0 <= reg) && (reg < kNumVFPRegisters));
106  return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)];
107}
108
109
110int VFPRegisters::Number(const char* name, bool* is_double) {
111  for (int i = 0; i < kNumVFPRegisters; i++) {
112    if (strcmp(names_[i], name) == 0) {
113      if (i < kNumVFPSingleRegisters) {
114        *is_double = false;
115        return i;
116      } else {
117        *is_double = true;
118        return i - kNumVFPSingleRegisters;
119      }
120    }
121  }
122
123  // No register with the requested name found.
124  return kNoRegister;
125}
126
127
128int Registers::Number(const char* name) {
129  // Look through the canonical names.
130  for (int i = 0; i < kNumRegisters; i++) {
131    if (strcmp(names_[i], name) == 0) {
132      return i;
133    }
134  }
135
136  // Look through the alias names.
137  int i = 0;
138  while (aliases_[i].reg != kNoRegister) {
139    if (strcmp(aliases_[i].name, name) == 0) {
140      return aliases_[i].reg;
141    }
142    i++;
143  }
144
145  // No register with the requested name found.
146  return kNoRegister;
147}
148
149
150} }  // namespace v8::internal
151
152#endif  // V8_TARGET_ARCH_ARM
153