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      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 
     12 namespace v8 {
     13 namespace internal {
     14 
     15 double 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>".
     38 const 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.
     45 const 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 
     56 const 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>".
     71 const 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 
     83 const 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 
     89 int 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 
    107 int 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