diff options
Diffstat (limited to 'arch/mips/isa/base.isa')
| -rw-r--r-- | arch/mips/isa/base.isa | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/mips/isa/base.isa b/arch/mips/isa/base.isa new file mode 100644 index 000000000..b504f1906 --- /dev/null +++ b/arch/mips/isa/base.isa @@ -0,0 +1,82 @@ +//////////////////////////////////////////////////////////////////// +// +// Base class for sparc instructions, and some support functions +// + +output header {{ + /** + * Base class for all SPARC static instructions. + */ + class SparcStaticInst : public StaticInst<SPARCISA> + { + protected: + + // Constructor. + SparcStaticInst(const char *mnem, MachInst _machInst, OpClass __opClass) + : StaticInst<SPARCISA>(mnem, _machInst, __opClass) + { + } + + std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const; + }; + + bool passesCondition(struct {uint8_t c:1; uint8_t v:1; uint8_t z:1; uint8_t n:1} codes, uint8_t condition); +}}; + +output decoder {{ + + std::string SparcStaticInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const + { + std::stringstream ss; + + ccprintf(ss, "%-10s ", mnemonic); + + // just print the first two source regs... if there's + // a third one, it's a read-modify-write dest (Rc), + // e.g. for CMOVxx + if(_numSrcRegs > 0) + { + printReg(ss, _srcRegIdx[0]); + } + if(_numSrcRegs > 1) + { + ss << ","; + printReg(ss, _srcRegIdx[1]); + } + + // just print the first dest... if there's a second one, + // it's generally implicit + if(_numDestRegs > 0) + { + if(_numSrcRegs > 0) + ss << ","; + printReg(ss, _destRegIdx[0]); + } + + return ss.str(); + } + + bool passesCondition(struct {uint8_t c:1; uint8_t v:1; uint8_t z:1; uint8_t n:1} codes, uint8_t condition) + { + switch(condition) + { + case 0b1000: return true; + case 0b0000: return false; + case 0b1001: return !codes.z; + case 0b0001: return codes.z; + case 0b1010: return !(codes.z | (codes.n ^ codes.v)); + case 0b0010: return codes.z | (codes.n ^ codes.v); + case 0b1011: return !(codes.n ^ codes.v); + case 0b0011: return (codes.n ^ codes.v); + case 0b1100: return !(codes.c | codes.z); + case 0b0100: return (codes.c | codes.z); + case 0b1101: return !codes.c; + case 0b0101: return codes.c; + case 0b1110: return !codes.n; + case 0b0110: return codes.n; + case 0b1111: return !codes.v; + case 0b0111: return codes.v; + } + } +}}; + |