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
35 namespace v8 {
36 namespace internal {
37
DoubleImmedVmov() const38 double 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>".
61 const 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.
68 const 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
Name(int reg)79 const 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>".
94 const 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
Name(int reg,bool is_double)104 const 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
Number(const char * name,bool * is_double)110 int 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
Number(const char * name)128 int 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