29output header {{ 30#include <sstream> 31#include <iostream> 32#include <iomanip> 33 34#include "config/ss_compatible_fp.hh" 35#include "cpu/static_inst.hh" 36#include "arch/alpha/faults.hh" 37#include "mem/request.hh" // some constructors use MemReq flags 38}}; 39 40output decoder {{ 41#include "base/cprintf.hh" 42#include "base/fenv.hh" 43#include "base/loader/symtab.hh" 44#include "config/ss_compatible_fp.hh" 45#include "cpu/exec_context.hh" // for Jump::branchTarget() 46 47#include <math.h> 48 49using namespace AlphaISA; 50}}; 51 52output exec {{ 53#include <math.h> 54 55#if FULL_SYSTEM 56#include "sim/pseudo_inst.hh" 57#endif 58#include "base/fenv.hh" 59#include "config/ss_compatible_fp.hh" 60#include "cpu/base.hh" 61#include "cpu/exetrace.hh" 62#include "sim/sim_exit.hh" 63#include "mem/packet_impl.hh" 64 65using namespace AlphaISA; 66}}; 67 68//////////////////////////////////////////////////////////////////// 69// 70// Namespace statement. Everything below this line will be in the 71// AlphaISAInst namespace. 72// 73 74 75namespace AlphaISA; 76 77//////////////////////////////////////////////////////////////////// 78// 79// Bitfield definitions. 80// 81 82// Universal (format-independent) fields 83def bitfield PALMODE <32:32>; 84def bitfield OPCODE <31:26>; 85def bitfield RA <25:21>; 86def bitfield RB <20:16>; 87 88// Memory format 89def signed bitfield MEMDISP <15: 0>; // displacement 90def bitfield MEMFUNC <15: 0>; // function code (same field, unsigned) 91 92// Memory-format jumps 93def bitfield JMPFUNC <15:14>; // function code (disp<15:14>) 94def bitfield JMPHINT <13: 0>; // tgt Icache idx hint (disp<13:0>) 95 96// Branch format 97def signed bitfield BRDISP <20: 0>; // displacement 98 99// Integer operate format(s>; 100def bitfield INTIMM <20:13>; // integer immediate (literal) 101def bitfield IMM <12:12>; // immediate flag 102def bitfield INTFUNC <11: 5>; // function code 103def bitfield RC < 4: 0>; // dest reg 104 105// Floating-point operate format 106def bitfield FA <25:21>; 107def bitfield FB <20:16>; 108def bitfield FP_FULLFUNC <15: 5>; // complete function code 109 def bitfield FP_TRAPMODE <15:13>; // trapping mode 110 def bitfield FP_ROUNDMODE <12:11>; // rounding mode 111 def bitfield FP_TYPEFUNC <10: 5>; // type+func: handiest for decoding 112 def bitfield FP_SRCTYPE <10: 9>; // source reg type 113 def bitfield FP_SHORTFUNC < 8: 5>; // short function code 114 def bitfield FP_SHORTFUNC_TOP2 <8:7>; // top 2 bits of short func code 115def bitfield FC < 4: 0>; // dest reg 116 117// PALcode format 118def bitfield PALFUNC <25: 0>; // function code 119 120// EV5 PAL instructions: 121// HW_LD/HW_ST 122def bitfield HW_LDST_PHYS <15>; // address is physical 123def bitfield HW_LDST_ALT <14>; // use ALT_MODE IPR 124def bitfield HW_LDST_WRTCK <13>; // HW_LD only: fault if no write acc 125def bitfield HW_LDST_QUAD <12>; // size: 0=32b, 1=64b 126def bitfield HW_LDST_VPTE <11>; // HW_LD only: is PTE fetch 127def bitfield HW_LDST_LOCK <10>; // HW_LD only: is load locked 128def bitfield HW_LDST_COND <10>; // HW_ST only: is store conditional 129def signed bitfield HW_LDST_DISP <9:0>; // signed displacement 130 131// HW_REI 132def bitfield HW_REI_TYP <15:14>; // type: stalling vs. non-stallingk 133def bitfield HW_REI_MBZ <13: 0>; // must be zero 134 135// HW_MTPR/MW_MFPR 136def bitfield HW_IPR_IDX <15:0>; // IPR index 137 138// M5 instructions 139def bitfield M5FUNC <7:0>; 140 141def operand_types {{ 142 'sb' : ('signed int', 8), 143 'ub' : ('unsigned int', 8), 144 'sw' : ('signed int', 16), 145 'uw' : ('unsigned int', 16), 146 'sl' : ('signed int', 32), 147 'ul' : ('unsigned int', 32), 148 'sq' : ('signed int', 64), 149 'uq' : ('unsigned int', 64), 150 'sf' : ('float', 32), 151 'df' : ('float', 64) 152}}; 153 154def operands {{ 155 # Int regs default to unsigned, but code should not count on this. 156 # For clarity, descriptions that depend on unsigned behavior should 157 # explicitly specify '.uq'. 158 'Ra': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RA] : RA', 159 'IsInteger', 1), 160 'Rb': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RB] : RB', 161 'IsInteger', 2), 162 'Rc': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RC] : RC', 163 'IsInteger', 3), 164 'Fa': ('FloatReg', 'df', 'FA', 'IsFloating', 1), 165 'Fb': ('FloatReg', 'df', 'FB', 'IsFloating', 2), 166 'Fc': ('FloatReg', 'df', 'FC', 'IsFloating', 3), 167 'Mem': ('Mem', 'uq', None, ('IsMemRef', 'IsLoad', 'IsStore'), 4), 168 'NPC': ('NPC', 'uq', None, ( None, None, 'IsControl' ), 4), 169 'Runiq': ('ControlReg', 'uq', 'TheISA::Uniq_DepTag', None, 1), 170 'FPCR': (' ControlReg', 'uq', 'TheISA::Fpcr_DepTag', None, 1), 171 # The next two are hacks for non-full-system call-pal emulation 172 'R0': ('IntReg', 'uq', '0', None, 1), 173 'R16': ('IntReg', 'uq', '16', None, 1), 174 'R17': ('IntReg', 'uq', '17', None, 1), 175 'R18': ('IntReg', 'uq', '18', None, 1) 176}}; 177 178//////////////////////////////////////////////////////////////////// 179// 180// Basic instruction classes/templates/formats etc. 181// 182 183output header {{ 184// uncomment the following to get SimpleScalar-compatible disassembly 185// (useful for diffing output traces). 186// #define SS_COMPATIBLE_DISASSEMBLY 187 188 /** 189 * Base class for all Alpha static instructions. 190 */ 191 class AlphaStaticInst : public StaticInst 192 { 193 protected: 194 195 /// Make AlphaISA register dependence tags directly visible in 196 /// this class and derived classes. Maybe these should really 197 /// live here and not in the AlphaISA namespace. 198 enum DependenceTags { 199 FP_Base_DepTag = AlphaISA::FP_Base_DepTag, 200 Fpcr_DepTag = AlphaISA::Fpcr_DepTag, 201 Uniq_DepTag = AlphaISA::Uniq_DepTag, 202 Lock_Flag_DepTag = AlphaISA::Lock_Flag_DepTag, 203 Lock_Addr_DepTag = AlphaISA::Lock_Addr_DepTag, 204 IPR_Base_DepTag = AlphaISA::IPR_Base_DepTag 205 }; 206 207 /// Constructor. 208 AlphaStaticInst(const char *mnem, ExtMachInst _machInst, 209 OpClass __opClass) 210 : StaticInst(mnem, _machInst, __opClass) 211 { 212 } 213 214 /// Print a register name for disassembly given the unique 215 /// dependence tag number (FP or int). 216 void printReg(std::ostream &os, int reg) const; 217 218 std::string 219 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 220 }; 221}}; 222 223output decoder {{ 224 void 225 AlphaStaticInst::printReg(std::ostream &os, int reg) const 226 { 227 if (reg < FP_Base_DepTag) { 228 ccprintf(os, "r%d", reg); 229 } 230 else { 231 ccprintf(os, "f%d", reg - FP_Base_DepTag); 232 } 233 } 234 235 std::string 236 AlphaStaticInst::generateDisassembly(Addr pc, 237 const SymbolTable *symtab) const 238 { 239 std::stringstream ss; 240 241 ccprintf(ss, "%-10s ", mnemonic); 242 243 // just print the first two source regs... if there's 244 // a third one, it's a read-modify-write dest (Rc), 245 // e.g. for CMOVxx 246 if (_numSrcRegs > 0) { 247 printReg(ss, _srcRegIdx[0]); 248 } 249 if (_numSrcRegs > 1) { 250 ss << ","; 251 printReg(ss, _srcRegIdx[1]); 252 } 253 254 // just print the first dest... if there's a second one, 255 // it's generally implicit 256 if (_numDestRegs > 0) { 257 if (_numSrcRegs > 0) 258 ss << ","; 259 printReg(ss, _destRegIdx[0]); 260 } 261 262 return ss.str(); 263 } 264}}; 265 266// Declarations for execute() methods. 267def template BasicExecDeclare {{ 268 Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const; 269}}; 270 271// Basic instruction class declaration template. 272def template BasicDeclare {{ 273 /** 274 * Static instruction class for "%(mnemonic)s". 275 */ 276 class %(class_name)s : public %(base_class)s 277 { 278 public: 279 /// Constructor. 280 %(class_name)s(ExtMachInst machInst); 281 282 %(BasicExecDeclare)s 283 }; 284}}; 285 286// Basic instruction class constructor template. 287def template BasicConstructor {{ 288 inline %(class_name)s::%(class_name)s(ExtMachInst machInst) 289 : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s) 290 { 291 %(constructor)s; 292 } 293}}; 294 295// Basic instruction class execute method template. 296def template BasicExecute {{ 297 Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, 298 Trace::InstRecord *traceData) const 299 { 300 Fault fault = NoFault; 301 302 %(fp_enable_check)s; 303 %(op_decl)s; 304 %(op_rd)s; 305 %(code)s; 306 307 if (fault == NoFault) { 308 %(op_wb)s; 309 } 310 311 return fault; 312 } 313}}; 314 315// Basic decode template. 316def template BasicDecode {{ 317 return new %(class_name)s(machInst); 318}}; 319 320// Basic decode template, passing mnemonic in as string arg to constructor. 321def template BasicDecodeWithMnemonic {{ 322 return new %(class_name)s("%(mnemonic)s", machInst); 323}}; 324 325// The most basic instruction format... used only for a few misc. insts 326def format BasicOperate(code, *flags) {{ 327 iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code), flags) 328 header_output = BasicDeclare.subst(iop) 329 decoder_output = BasicConstructor.subst(iop) 330 decode_block = BasicDecode.subst(iop) 331 exec_output = BasicExecute.subst(iop) 332}}; 333 334 335 336//////////////////////////////////////////////////////////////////// 337// 338// Nop 339// 340 341output header {{ 342 /** 343 * Static instruction class for no-ops. This is a leaf class. 344 */ 345 class Nop : public AlphaStaticInst 346 { 347 /// Disassembly of original instruction. 348 const std::string originalDisassembly; 349 350 public: 351 /// Constructor 352 Nop(const std::string _originalDisassembly, ExtMachInst _machInst) 353 : AlphaStaticInst("nop", _machInst, No_OpClass), 354 originalDisassembly(_originalDisassembly) 355 { 356 flags[IsNop] = true; 357 } 358 359 ~Nop() { } 360 361 std::string 362 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 363 364 %(BasicExecDeclare)s 365 }; 366 367 /// Helper function for decoding nops. Substitute Nop object 368 /// for original inst passed in as arg (and delete latter). 369 static inline 370 AlphaStaticInst * 371 makeNop(AlphaStaticInst *inst) 372 { 373 AlphaStaticInst *nop = new Nop(inst->disassemble(0), inst->machInst); 374 delete inst; 375 return nop; 376 } 377}}; 378 379output decoder {{ 380 std::string Nop::generateDisassembly(Addr pc, 381 const SymbolTable *symtab) const 382 { 383#ifdef SS_COMPATIBLE_DISASSEMBLY 384 return originalDisassembly; 385#else 386 return csprintf("%-10s (%s)", "nop", originalDisassembly); 387#endif 388 } 389}}; 390 391output exec {{ 392 Fault 393 Nop::execute(%(CPU_exec_context)s *, Trace::InstRecord *) const 394 { 395 return NoFault; 396 } 397}}; 398 399// integer & FP operate instructions use Rc as dest, so check for 400// Rc == 31 to detect nops 401def template OperateNopCheckDecode {{ 402 { 403 AlphaStaticInst *i = new %(class_name)s(machInst); 404 if (RC == 31) { 405 i = makeNop(i); 406 } 407 return i; 408 } 409}}; 410 411// Like BasicOperate format, but generates NOP if RC/FC == 31 412def format BasicOperateWithNopCheck(code, *opt_args) {{ 413 iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code), 414 opt_args) 415 header_output = BasicDeclare.subst(iop) 416 decoder_output = BasicConstructor.subst(iop) 417 decode_block = OperateNopCheckDecode.subst(iop) 418 exec_output = BasicExecute.subst(iop) 419}}; 420 421// Integer instruction templates, formats, etc. 422##include "int.isa" 423 424// Floating-point instruction templates, formats, etc. 425##include "fp.isa" 426 427// Memory instruction templates, formats, etc. 428##include "mem.isa" 429 430// Branch/jump instruction templates, formats, etc. 431##include "branch.isa" 432 433// PAL instruction templates, formats, etc. 434##include "pal.isa" 435 436// Opcdec fault instruction templates, formats, etc. 437##include "opcdec.isa" 438 439// Unimplemented instruction templates, formats, etc. 440##include "unimp.isa" 441 442// Unknown instruction templates, formats, etc. 443##include "unknown.isa" 444 445// Execution utility functions 446##include "util.isa" 447 448// The actual decoder 449##include "decoder.isa"
| 41output header {{ 42#include <sstream> 43#include <iostream> 44#include <iomanip> 45 46#include "config/ss_compatible_fp.hh" 47#include "cpu/static_inst.hh" 48#include "arch/alpha/faults.hh" 49#include "mem/request.hh" // some constructors use MemReq flags 50}}; 51 52output decoder {{ 53#include "base/cprintf.hh" 54#include "base/fenv.hh" 55#include "base/loader/symtab.hh" 56#include "config/ss_compatible_fp.hh" 57#include "cpu/exec_context.hh" // for Jump::branchTarget() 58 59#include <math.h> 60 61using namespace AlphaISA; 62}}; 63 64output exec {{ 65#include <math.h> 66 67#if FULL_SYSTEM 68#include "sim/pseudo_inst.hh" 69#endif 70#include "base/fenv.hh" 71#include "config/ss_compatible_fp.hh" 72#include "cpu/base.hh" 73#include "cpu/exetrace.hh" 74#include "sim/sim_exit.hh" 75#include "mem/packet_impl.hh" 76 77using namespace AlphaISA; 78}}; 79 80//////////////////////////////////////////////////////////////////// 81// 82// Namespace statement. Everything below this line will be in the 83// AlphaISAInst namespace. 84// 85 86 87namespace AlphaISA; 88 89//////////////////////////////////////////////////////////////////// 90// 91// Bitfield definitions. 92// 93 94// Universal (format-independent) fields 95def bitfield PALMODE <32:32>; 96def bitfield OPCODE <31:26>; 97def bitfield RA <25:21>; 98def bitfield RB <20:16>; 99 100// Memory format 101def signed bitfield MEMDISP <15: 0>; // displacement 102def bitfield MEMFUNC <15: 0>; // function code (same field, unsigned) 103 104// Memory-format jumps 105def bitfield JMPFUNC <15:14>; // function code (disp<15:14>) 106def bitfield JMPHINT <13: 0>; // tgt Icache idx hint (disp<13:0>) 107 108// Branch format 109def signed bitfield BRDISP <20: 0>; // displacement 110 111// Integer operate format(s>; 112def bitfield INTIMM <20:13>; // integer immediate (literal) 113def bitfield IMM <12:12>; // immediate flag 114def bitfield INTFUNC <11: 5>; // function code 115def bitfield RC < 4: 0>; // dest reg 116 117// Floating-point operate format 118def bitfield FA <25:21>; 119def bitfield FB <20:16>; 120def bitfield FP_FULLFUNC <15: 5>; // complete function code 121 def bitfield FP_TRAPMODE <15:13>; // trapping mode 122 def bitfield FP_ROUNDMODE <12:11>; // rounding mode 123 def bitfield FP_TYPEFUNC <10: 5>; // type+func: handiest for decoding 124 def bitfield FP_SRCTYPE <10: 9>; // source reg type 125 def bitfield FP_SHORTFUNC < 8: 5>; // short function code 126 def bitfield FP_SHORTFUNC_TOP2 <8:7>; // top 2 bits of short func code 127def bitfield FC < 4: 0>; // dest reg 128 129// PALcode format 130def bitfield PALFUNC <25: 0>; // function code 131 132// EV5 PAL instructions: 133// HW_LD/HW_ST 134def bitfield HW_LDST_PHYS <15>; // address is physical 135def bitfield HW_LDST_ALT <14>; // use ALT_MODE IPR 136def bitfield HW_LDST_WRTCK <13>; // HW_LD only: fault if no write acc 137def bitfield HW_LDST_QUAD <12>; // size: 0=32b, 1=64b 138def bitfield HW_LDST_VPTE <11>; // HW_LD only: is PTE fetch 139def bitfield HW_LDST_LOCK <10>; // HW_LD only: is load locked 140def bitfield HW_LDST_COND <10>; // HW_ST only: is store conditional 141def signed bitfield HW_LDST_DISP <9:0>; // signed displacement 142 143// HW_REI 144def bitfield HW_REI_TYP <15:14>; // type: stalling vs. non-stallingk 145def bitfield HW_REI_MBZ <13: 0>; // must be zero 146 147// HW_MTPR/MW_MFPR 148def bitfield HW_IPR_IDX <15:0>; // IPR index 149 150// M5 instructions 151def bitfield M5FUNC <7:0>; 152 153def operand_types {{ 154 'sb' : ('signed int', 8), 155 'ub' : ('unsigned int', 8), 156 'sw' : ('signed int', 16), 157 'uw' : ('unsigned int', 16), 158 'sl' : ('signed int', 32), 159 'ul' : ('unsigned int', 32), 160 'sq' : ('signed int', 64), 161 'uq' : ('unsigned int', 64), 162 'sf' : ('float', 32), 163 'df' : ('float', 64) 164}}; 165 166def operands {{ 167 # Int regs default to unsigned, but code should not count on this. 168 # For clarity, descriptions that depend on unsigned behavior should 169 # explicitly specify '.uq'. 170 'Ra': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RA] : RA', 171 'IsInteger', 1), 172 'Rb': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RB] : RB', 173 'IsInteger', 2), 174 'Rc': ('IntReg', 'uq', 'PALMODE ? AlphaISA::reg_redir[RC] : RC', 175 'IsInteger', 3), 176 'Fa': ('FloatReg', 'df', 'FA', 'IsFloating', 1), 177 'Fb': ('FloatReg', 'df', 'FB', 'IsFloating', 2), 178 'Fc': ('FloatReg', 'df', 'FC', 'IsFloating', 3), 179 'Mem': ('Mem', 'uq', None, ('IsMemRef', 'IsLoad', 'IsStore'), 4), 180 'NPC': ('NPC', 'uq', None, ( None, None, 'IsControl' ), 4), 181 'Runiq': ('ControlReg', 'uq', 'TheISA::Uniq_DepTag', None, 1), 182 'FPCR': (' ControlReg', 'uq', 'TheISA::Fpcr_DepTag', None, 1), 183 # The next two are hacks for non-full-system call-pal emulation 184 'R0': ('IntReg', 'uq', '0', None, 1), 185 'R16': ('IntReg', 'uq', '16', None, 1), 186 'R17': ('IntReg', 'uq', '17', None, 1), 187 'R18': ('IntReg', 'uq', '18', None, 1) 188}}; 189 190//////////////////////////////////////////////////////////////////// 191// 192// Basic instruction classes/templates/formats etc. 193// 194 195output header {{ 196// uncomment the following to get SimpleScalar-compatible disassembly 197// (useful for diffing output traces). 198// #define SS_COMPATIBLE_DISASSEMBLY 199 200 /** 201 * Base class for all Alpha static instructions. 202 */ 203 class AlphaStaticInst : public StaticInst 204 { 205 protected: 206 207 /// Make AlphaISA register dependence tags directly visible in 208 /// this class and derived classes. Maybe these should really 209 /// live here and not in the AlphaISA namespace. 210 enum DependenceTags { 211 FP_Base_DepTag = AlphaISA::FP_Base_DepTag, 212 Fpcr_DepTag = AlphaISA::Fpcr_DepTag, 213 Uniq_DepTag = AlphaISA::Uniq_DepTag, 214 Lock_Flag_DepTag = AlphaISA::Lock_Flag_DepTag, 215 Lock_Addr_DepTag = AlphaISA::Lock_Addr_DepTag, 216 IPR_Base_DepTag = AlphaISA::IPR_Base_DepTag 217 }; 218 219 /// Constructor. 220 AlphaStaticInst(const char *mnem, ExtMachInst _machInst, 221 OpClass __opClass) 222 : StaticInst(mnem, _machInst, __opClass) 223 { 224 } 225 226 /// Print a register name for disassembly given the unique 227 /// dependence tag number (FP or int). 228 void printReg(std::ostream &os, int reg) const; 229 230 std::string 231 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 232 }; 233}}; 234 235output decoder {{ 236 void 237 AlphaStaticInst::printReg(std::ostream &os, int reg) const 238 { 239 if (reg < FP_Base_DepTag) { 240 ccprintf(os, "r%d", reg); 241 } 242 else { 243 ccprintf(os, "f%d", reg - FP_Base_DepTag); 244 } 245 } 246 247 std::string 248 AlphaStaticInst::generateDisassembly(Addr pc, 249 const SymbolTable *symtab) const 250 { 251 std::stringstream ss; 252 253 ccprintf(ss, "%-10s ", mnemonic); 254 255 // just print the first two source regs... if there's 256 // a third one, it's a read-modify-write dest (Rc), 257 // e.g. for CMOVxx 258 if (_numSrcRegs > 0) { 259 printReg(ss, _srcRegIdx[0]); 260 } 261 if (_numSrcRegs > 1) { 262 ss << ","; 263 printReg(ss, _srcRegIdx[1]); 264 } 265 266 // just print the first dest... if there's a second one, 267 // it's generally implicit 268 if (_numDestRegs > 0) { 269 if (_numSrcRegs > 0) 270 ss << ","; 271 printReg(ss, _destRegIdx[0]); 272 } 273 274 return ss.str(); 275 } 276}}; 277 278// Declarations for execute() methods. 279def template BasicExecDeclare {{ 280 Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const; 281}}; 282 283// Basic instruction class declaration template. 284def template BasicDeclare {{ 285 /** 286 * Static instruction class for "%(mnemonic)s". 287 */ 288 class %(class_name)s : public %(base_class)s 289 { 290 public: 291 /// Constructor. 292 %(class_name)s(ExtMachInst machInst); 293 294 %(BasicExecDeclare)s 295 }; 296}}; 297 298// Basic instruction class constructor template. 299def template BasicConstructor {{ 300 inline %(class_name)s::%(class_name)s(ExtMachInst machInst) 301 : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s) 302 { 303 %(constructor)s; 304 } 305}}; 306 307// Basic instruction class execute method template. 308def template BasicExecute {{ 309 Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, 310 Trace::InstRecord *traceData) const 311 { 312 Fault fault = NoFault; 313 314 %(fp_enable_check)s; 315 %(op_decl)s; 316 %(op_rd)s; 317 %(code)s; 318 319 if (fault == NoFault) { 320 %(op_wb)s; 321 } 322 323 return fault; 324 } 325}}; 326 327// Basic decode template. 328def template BasicDecode {{ 329 return new %(class_name)s(machInst); 330}}; 331 332// Basic decode template, passing mnemonic in as string arg to constructor. 333def template BasicDecodeWithMnemonic {{ 334 return new %(class_name)s("%(mnemonic)s", machInst); 335}}; 336 337// The most basic instruction format... used only for a few misc. insts 338def format BasicOperate(code, *flags) {{ 339 iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code), flags) 340 header_output = BasicDeclare.subst(iop) 341 decoder_output = BasicConstructor.subst(iop) 342 decode_block = BasicDecode.subst(iop) 343 exec_output = BasicExecute.subst(iop) 344}}; 345 346 347 348//////////////////////////////////////////////////////////////////// 349// 350// Nop 351// 352 353output header {{ 354 /** 355 * Static instruction class for no-ops. This is a leaf class. 356 */ 357 class Nop : public AlphaStaticInst 358 { 359 /// Disassembly of original instruction. 360 const std::string originalDisassembly; 361 362 public: 363 /// Constructor 364 Nop(const std::string _originalDisassembly, ExtMachInst _machInst) 365 : AlphaStaticInst("nop", _machInst, No_OpClass), 366 originalDisassembly(_originalDisassembly) 367 { 368 flags[IsNop] = true; 369 } 370 371 ~Nop() { } 372 373 std::string 374 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 375 376 %(BasicExecDeclare)s 377 }; 378 379 /// Helper function for decoding nops. Substitute Nop object 380 /// for original inst passed in as arg (and delete latter). 381 static inline 382 AlphaStaticInst * 383 makeNop(AlphaStaticInst *inst) 384 { 385 AlphaStaticInst *nop = new Nop(inst->disassemble(0), inst->machInst); 386 delete inst; 387 return nop; 388 } 389}}; 390 391output decoder {{ 392 std::string Nop::generateDisassembly(Addr pc, 393 const SymbolTable *symtab) const 394 { 395#ifdef SS_COMPATIBLE_DISASSEMBLY 396 return originalDisassembly; 397#else 398 return csprintf("%-10s (%s)", "nop", originalDisassembly); 399#endif 400 } 401}}; 402 403output exec {{ 404 Fault 405 Nop::execute(%(CPU_exec_context)s *, Trace::InstRecord *) const 406 { 407 return NoFault; 408 } 409}}; 410 411// integer & FP operate instructions use Rc as dest, so check for 412// Rc == 31 to detect nops 413def template OperateNopCheckDecode {{ 414 { 415 AlphaStaticInst *i = new %(class_name)s(machInst); 416 if (RC == 31) { 417 i = makeNop(i); 418 } 419 return i; 420 } 421}}; 422 423// Like BasicOperate format, but generates NOP if RC/FC == 31 424def format BasicOperateWithNopCheck(code, *opt_args) {{ 425 iop = InstObjParams(name, Name, 'AlphaStaticInst', CodeBlock(code), 426 opt_args) 427 header_output = BasicDeclare.subst(iop) 428 decoder_output = BasicConstructor.subst(iop) 429 decode_block = OperateNopCheckDecode.subst(iop) 430 exec_output = BasicExecute.subst(iop) 431}}; 432 433// Integer instruction templates, formats, etc. 434##include "int.isa" 435 436// Floating-point instruction templates, formats, etc. 437##include "fp.isa" 438 439// Memory instruction templates, formats, etc. 440##include "mem.isa" 441 442// Branch/jump instruction templates, formats, etc. 443##include "branch.isa" 444 445// PAL instruction templates, formats, etc. 446##include "pal.isa" 447 448// Opcdec fault instruction templates, formats, etc. 449##include "opcdec.isa" 450 451// Unimplemented instruction templates, formats, etc. 452##include "unimp.isa" 453 454// Unknown instruction templates, formats, etc. 455##include "unknown.isa" 456 457// Execution utility functions 458##include "util.isa" 459 460// The actual decoder 461##include "decoder.isa"
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