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// Copyright 2009 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_ARM
#include "src/arm/constants-arm.h"
namespace v8 {
namespace internal {
double Instruction::DoubleImmedVmov() const {
// Reconstruct a double from the immediate encoded in the vmov instruction.
//
// instruction: [xxxxxxxx,xxxxabcd,xxxxxxxx,xxxxefgh]
// double: [aBbbbbbb,bbcdefgh,00000000,00000000,
// 00000000,00000000,00000000,00000000]
//
// where B = ~b. Only the high 16 bits are affected.
uint64_t high16;
high16 = (Bits(17, 16) << 4) | Bits(3, 0); // xxxxxxxx,xxcdefgh.
high16 |= (0xff * Bit(18)) << 6; // xxbbbbbb,bbxxxxxx.
high16 |= (Bit(18) ^ 1) << 14; // xBxxxxxx,xxxxxxxx.
high16 |= Bit(19) << 15; // axxxxxxx,xxxxxxxx.
uint64_t imm = high16 << 48;
double d;
memcpy(&d, &imm, 8);
return d;
}
// These register names are defined in a way to match the native disassembler
// formatting. See for example the command "objdump -d <binary file>".
const char* Registers::names_[kNumRegisters] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc",
};
// List of alias names which can be used when referring to ARM registers.
const Registers::RegisterAlias Registers::aliases_[] = {
{10, "sl"},
{11, "r11"},
{12, "r12"},
{13, "r13"},
{14, "r14"},
{15, "r15"},
{kNoRegister, NULL}
};
const char* Registers::Name(int reg) {
const char* result;
if ((0 <= reg) && (reg < kNumRegisters)) {
result = names_[reg];
} else {
result = "noreg";
}
return result;
}
// Support for VFP registers s0 to s31 (d0 to d15) and d16-d31.
// Note that "sN:sM" is the same as "dN/2" up to d15.
// These register names are defined in a way to match the native disassembler
// formatting. See for example the command "objdump -d <binary file>".
const char* VFPRegisters::names_[kNumVFPRegisters] = {
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
"s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
"s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
"s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
"d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
"d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
"d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
};
const char* VFPRegisters::Name(int reg, bool is_double) {
DCHECK((0 <= reg) && (reg < kNumVFPRegisters));
return names_[reg + (is_double ? kNumVFPSingleRegisters : 0)];
}
int VFPRegisters::Number(const char* name, bool* is_double) {
for (int i = 0; i < kNumVFPRegisters; i++) {
if (strcmp(names_[i], name) == 0) {
if (i < kNumVFPSingleRegisters) {
*is_double = false;
return i;
} else {
*is_double = true;
return i - kNumVFPSingleRegisters;
}
}
}
// No register with the requested name found.
return kNoRegister;
}
int Registers::Number(const char* name) {
// Look through the canonical names.
for (int i = 0; i < kNumRegisters; i++) {
if (strcmp(names_[i], name) == 0) {
return i;
}
}
// Look through the alias names.
int i = 0;
while (aliases_[i].reg != kNoRegister) {
if (strcmp(aliases_[i].name, name) == 0) {
return aliases_[i].reg;
}
i++;
}
// No register with the requested name found.
return kNoRegister;
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_ARM
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