src/arch/x86/isa_traits.hh

   1 /*
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  55  * Authors: Gabe Black
  56  */
  57
  58 #ifndef __ARCH_X86_ISATRAITS_HH__
  59 #define __ARCH_X86_ISATRAITS_HH__
  60
  61 #include "arch/x86/x86_traits.hh"
  62
  63 namespace LittleEndianGuest {}
  64
  65 namespace X86ISA
  66 {
  67     //This makes sure the little endian version of certain functions
  68     //are used.
  69     using namespace LittleEndianGuest;
  70
  71     // X86 does not have a delay slot
  72 #define ISA_HAS_DELAY_SLOT 0
  73
  74     // X86 NOP (XCHG rAX, rAX)
  75     //XXX This needs to be set to an intermediate instruction struct
  76     //which encodes this instruction
  77
  78     // These enumerate all the registers for dependence tracking.
  79     enum DependenceTags {
  80         //The number of microcode registers needs to be added to this
  81         FP_Base_DepTag = 16,
  82         Ctrl_Base_DepTag =
  83             FP_Base_DepTag +
  84             //mmx/x87 registers
  85             8 +
  86             //xmm registers
  87             16
  88     };
  89
  90     // semantically meaningful register indices
  91     //There is no such register in X86
  92     const int ZeroReg = 0;
  93     const int StackPointerReg = 4; //RSP
  94     //X86 doesn't seem to have a link register
  95     const int ReturnAddressReg = 0;
  96     const int ReturnValueReg = 0; //RAX
  97     const int FramePointerReg = 5; //RBP
  98     const int ArgumentReg0 = 7; //RDI
  99     const int ArgumentReg1 = 6; //RSI
 100     const int ArgumentReg2 = 2; //RDX
 101     const int ArgumentReg3 = 1; //RCX
 102     const int ArgumentReg4 = 8; //R8W
 103     const int ArgumentReg5 = 9; //R9W
 104
 105     // Some OS syscalls use a second register (rdx) to return a second
 106     // value
 107     const int SyscallPseudoReturnReg = 2; //RDX
 108
 109     //XXX These numbers are bogus
 110     const int MaxInstSrcRegs = 10;
 111     const int MaxInstDestRegs = 10;
 112
 113     //4k. This value is not constant on x86.
 114     const int LogVmPageSize = 12;
 115     const int VMPageSize = (1 << LogVmPageSize);
 116
 117     const int BranchPredAddrShiftAmt = 0;
 118 };
 119
 120 #endif // __ARCH_X86_ISATRAITS_HH__