1 // See LICENSE for license details.
23 processor_t::processor_t(const char* isa
, sim_t
* sim
, uint32_t id
)
24 : sim(sim
), ext(NULL
), disassembler(new disassembler_t
),
25 id(id
), run(false), debug(false), halted(false)
27 parse_isa_string(isa
);
29 mmu
= new mmu_t(sim
, this);
33 register_base_instructions();
36 processor_t::~processor_t()
38 #ifdef RISCV_ENABLE_HISTOGRAM
39 if (histogram_enabled
)
41 fprintf(stderr
, "PC Histogram size:%zu\n", pc_histogram
.size());
42 for (auto it
: pc_histogram
)
43 fprintf(stderr
, "%0" PRIx64
" %" PRIu64
"\n", it
.first
, it
.second
);
51 static void bad_isa_string(const char* isa
)
53 fprintf(stderr
, "error: bad --isa option %s\n", isa
);
57 void processor_t::parse_isa_string(const char* str
)
59 std::string lowercase
, tmp
;
60 for (const char *r
= str
; *r
; r
++)
61 lowercase
+= std::tolower(*r
);
63 const char* p
= lowercase
.c_str();
64 const char* all_subsets
= "imafdc";
69 if (strncmp(p
, "rv32", 4) == 0)
70 max_xlen
= 32, isa
= reg_t(1) << 30, p
+= 4;
71 else if (strncmp(p
, "rv64", 4) == 0)
73 else if (strncmp(p
, "rv", 2) == 0)
78 } else if (*p
== 'g') { // treat "G" as "IMAFD"
79 tmp
= std::string("imafd") + (p
+1);
81 } else if (*p
!= 'i') {
85 isa_string
= "rv" + std::to_string(max_xlen
) + p
;
86 isa
|= 1L << ('s' - 'a'); // advertise support for supervisor mode
89 isa
|= 1L << (*p
- 'a');
91 if (auto next
= strchr(all_subsets
, *p
)) {
92 all_subsets
= next
+ 1;
94 } else if (*p
== 'x') {
95 const char* ext
= p
+1, *end
= ext
;
98 register_extension(find_extension(std::string(ext
, end
- ext
).c_str())());
105 if (supports_extension('D') && !supports_extension('F'))
108 // advertise support for supervisor and user modes
109 isa
|= 1L << ('s' - 'a');
110 isa
|= 1L << ('u' - 'a');
113 void state_t::reset()
115 memset(this, 0, sizeof(*this));
118 mtvec
= DEFAULT_MTVEC
;
119 load_reservation
= -1;
122 void processor_t::set_debug(bool value
)
126 ext
->set_debug(value
);
129 void processor_t::set_halted(bool value
)
134 void processor_t::set_histogram(bool value
)
136 histogram_enabled
= value
;
137 #ifndef RISCV_ENABLE_HISTOGRAM
139 fprintf(stderr
, "PC Histogram support has not been properly enabled;");
140 fprintf(stderr
, " please re-build the riscv-isa-run project using \"configure --enable-histogram\".\n");
145 void processor_t::reset(bool value
)
152 set_csr(CSR_MSTATUS
, state
.mstatus
);
155 ext
->reset(); // reset the extension
158 void processor_t::raise_interrupt(reg_t which
)
160 throw trap_t(((reg_t
)1 << (max_xlen
-1)) | which
);
163 static int ctz(reg_t val
)
167 while ((val
& 1) == 0)
172 void processor_t::take_interrupt()
174 reg_t pending_interrupts
= state
.mip
& state
.mie
;
176 reg_t mie
= get_field(state
.mstatus
, MSTATUS_MIE
);
177 reg_t m_enabled
= state
.prv
< PRV_M
|| (state
.prv
== PRV_M
&& mie
);
178 reg_t enabled_interrupts
= pending_interrupts
& ~state
.mideleg
& -m_enabled
;
180 reg_t sie
= get_field(state
.mstatus
, MSTATUS_SIE
);
181 reg_t s_enabled
= state
.prv
< PRV_S
|| (state
.prv
== PRV_S
&& sie
);
182 enabled_interrupts
|= pending_interrupts
& state
.mideleg
& -s_enabled
;
184 if (enabled_interrupts
)
185 raise_interrupt(ctz(enabled_interrupts
));
188 static bool validate_priv(reg_t priv
)
190 return priv
== PRV_U
|| priv
== PRV_S
|| priv
== PRV_M
;
193 void processor_t::set_privilege(reg_t prv
)
195 assert(validate_priv(prv
));
200 void processor_t::take_trap(trap_t
& t
, reg_t epc
)
203 fprintf(stderr
, "core %3d: exception %s, epc 0x%016" PRIx64
"\n",
206 // by default, trap to M-mode, unless delegated to S-mode
207 reg_t bit
= t
.cause();
208 reg_t deleg
= state
.medeleg
;
209 if (bit
& ((reg_t
)1 << (max_xlen
-1)))
210 deleg
= state
.mideleg
, bit
&= ~((reg_t
)1 << (max_xlen
-1));
211 if (state
.prv
<= PRV_S
&& bit
< max_xlen
&& ((deleg
>> bit
) & 1)) {
212 // handle the trap in S-mode
213 state
.pc
= state
.stvec
;
214 state
.scause
= t
.cause();
217 state
.sbadaddr
= t
.get_badaddr();
219 reg_t s
= state
.mstatus
;
220 s
= set_field(s
, MSTATUS_SPIE
, get_field(s
, MSTATUS_UIE
<< state
.prv
));
221 s
= set_field(s
, MSTATUS_SPP
, state
.prv
);
222 s
= set_field(s
, MSTATUS_SIE
, 0);
223 set_csr(CSR_MSTATUS
, s
);
224 set_privilege(PRV_S
);
226 state
.pc
= state
.mtvec
;
227 state
.mcause
= t
.cause();
230 state
.mbadaddr
= t
.get_badaddr();
232 reg_t s
= state
.mstatus
;
233 s
= set_field(s
, MSTATUS_MPIE
, get_field(s
, MSTATUS_UIE
<< state
.prv
));
234 s
= set_field(s
, MSTATUS_MPP
, state
.prv
);
235 s
= set_field(s
, MSTATUS_MIE
, 0);
236 set_csr(CSR_MSTATUS
, s
);
237 set_privilege(PRV_M
);
240 yield_load_reservation();
243 void processor_t::disasm(insn_t insn
)
245 uint64_t bits
= insn
.bits() & ((1ULL << (8 * insn_length(insn
.bits()))) - 1);
246 fprintf(stderr
, "core %3d: 0x%016" PRIx64
" (0x%08" PRIx64
") %s\n",
247 id
, state
.pc
, bits
, disassembler
->disassemble(insn
).c_str());
250 static bool validate_vm(int max_xlen
, reg_t vm
)
252 if (max_xlen
== 64 && (vm
== VM_SV39
|| vm
== VM_SV48
))
254 if (max_xlen
== 32 && vm
== VM_SV32
)
256 return vm
== VM_MBARE
;
259 void processor_t::set_csr(int which
, reg_t val
)
261 val
= zext_xlen(val
);
262 reg_t delegable_ints
= MIP_SSIP
| MIP_STIP
| MIP_SEIP
| (1 << IRQ_COP
);
263 reg_t all_ints
= delegable_ints
| MIP_MSIP
| MIP_MTIP
;
268 state
.fflags
= val
& (FSR_AEXC
>> FSR_AEXC_SHIFT
);
272 state
.frm
= val
& (FSR_RD
>> FSR_RD_SHIFT
);
276 state
.fflags
= (val
& FSR_AEXC
) >> FSR_AEXC_SHIFT
;
277 state
.frm
= (val
& FSR_RD
) >> FSR_RD_SHIFT
;
280 if ((val
^ state
.mstatus
) &
281 (MSTATUS_VM
| MSTATUS_MPP
| MSTATUS_MPRV
| MSTATUS_PUM
))
284 reg_t mask
= MSTATUS_SIE
| MSTATUS_SPIE
| MSTATUS_MIE
| MSTATUS_MPIE
285 | MSTATUS_SPP
| MSTATUS_FS
| MSTATUS_MPRV
| MSTATUS_PUM
286 | (ext
? MSTATUS_XS
: 0);
288 if (validate_vm(max_xlen
, get_field(val
, MSTATUS_VM
)))
290 if (validate_priv(get_field(val
, MSTATUS_MPP
)))
293 state
.mstatus
= (state
.mstatus
& ~mask
) | (val
& mask
);
295 bool dirty
= (state
.mstatus
& MSTATUS_FS
) == MSTATUS_FS
;
296 dirty
|= (state
.mstatus
& MSTATUS_XS
) == MSTATUS_XS
;
298 state
.mstatus
= set_field(state
.mstatus
, MSTATUS32_SD
, dirty
);
300 state
.mstatus
= set_field(state
.mstatus
, MSTATUS64_SD
, dirty
);
302 // spike supports the notion of xlen < max_xlen, but current priv spec
303 // doesn't provide a mechanism to run RV32 software on an RV64 machine
308 reg_t mask
= MIP_SSIP
| MIP_STIP
;
309 state
.mip
= (state
.mip
& ~mask
) | (val
& mask
);
313 state
.mie
= (state
.mie
& ~all_ints
) | (val
& all_ints
);
316 state
.mideleg
= (state
.mideleg
& ~delegable_ints
) | (val
& delegable_ints
);
320 #define DECLARE_CAUSE(name, value) mask |= 1ULL << (value);
321 #include "encoding.h"
323 state
.medeleg
= (state
.medeleg
& ~mask
) | (val
& mask
);
326 case CSR_MUCOUNTEREN
:
327 state
.mucounteren
= val
& 7;
329 case CSR_MSCOUNTEREN
:
330 state
.mscounteren
= val
& 7;
333 reg_t mask
= SSTATUS_SIE
| SSTATUS_SPIE
| SSTATUS_SPP
| SSTATUS_FS
334 | SSTATUS_XS
| SSTATUS_PUM
;
335 return set_csr(CSR_MSTATUS
, (state
.mstatus
& ~mask
) | (val
& mask
));
338 return set_csr(CSR_MIP
,
339 (state
.mip
& ~state
.mideleg
) | (val
& state
.mideleg
));
341 return set_csr(CSR_MIE
,
342 (state
.mie
& ~state
.mideleg
) | (val
& state
.mideleg
));
343 case CSR_SEPC
: state
.sepc
= val
; break;
344 case CSR_STVEC
: state
.stvec
= val
>> 2 << 2; break;
345 case CSR_SPTBR
: state
.sptbr
= val
; break;
346 case CSR_SSCRATCH
: state
.sscratch
= val
; break;
347 case CSR_SCAUSE
: state
.scause
= val
; break;
348 case CSR_SBADADDR
: state
.sbadaddr
= val
; break;
349 case CSR_MEPC
: state
.mepc
= val
; break;
350 case CSR_MTVEC
: state
.mtvec
= val
>> 2 << 2; break;
351 case CSR_MSCRATCH
: state
.mscratch
= val
; break;
352 case CSR_MCAUSE
: state
.mcause
= val
; break;
353 case CSR_MBADADDR
: state
.mbadaddr
= val
; break;
357 reg_t
processor_t::get_csr(int which
)
363 if (!supports_extension('F'))
368 if (!supports_extension('F'))
373 if (!supports_extension('F'))
375 return (state
.fflags
<< FSR_AEXC_SHIFT
) | (state
.frm
<< FSR_RD_SHIFT
);
379 if ((state
.mucounteren
>> (which
& (xlen
-1))) & 1)
380 return get_csr(which
+ (CSR_MCYCLE
- CSR_CYCLE
));
385 if ((state
.mscounteren
>> (which
& (xlen
-1))) & 1)
386 return get_csr(which
+ (CSR_MCYCLE
- CSR_SCYCLE
));
388 case CSR_MUCOUNTEREN
: return state
.mucounteren
;
389 case CSR_MSCOUNTEREN
: return state
.mscounteren
;
390 case CSR_MUCYCLE_DELTA
: return 0;
391 case CSR_MUTIME_DELTA
: return 0;
392 case CSR_MUINSTRET_DELTA
: return 0;
393 case CSR_MSCYCLE_DELTA
: return 0;
394 case CSR_MSTIME_DELTA
: return 0;
395 case CSR_MSINSTRET_DELTA
: return 0;
396 case CSR_MUCYCLE_DELTAH
: if (xlen
> 32) break; else return 0;
397 case CSR_MUTIME_DELTAH
: if (xlen
> 32) break; else return 0;
398 case CSR_MUINSTRET_DELTAH
: if (xlen
> 32) break; else return 0;
399 case CSR_MSCYCLE_DELTAH
: if (xlen
> 32) break; else return 0;
400 case CSR_MSTIME_DELTAH
: if (xlen
> 32) break; else return 0;
401 case CSR_MSINSTRET_DELTAH
: if (xlen
> 32) break; else return 0;
402 case CSR_MCYCLE
: return state
.minstret
;
403 case CSR_MINSTRET
: return state
.minstret
;
404 case CSR_MCYCLEH
: if (xlen
> 32) break; else return state
.minstret
>> 32;
405 case CSR_MINSTRETH
: if (xlen
> 32) break; else return state
.minstret
>> 32;
407 reg_t mask
= SSTATUS_SIE
| SSTATUS_SPIE
| SSTATUS_SPP
| SSTATUS_FS
408 | SSTATUS_XS
| SSTATUS_PUM
;
409 reg_t sstatus
= state
.mstatus
& mask
;
410 if ((sstatus
& SSTATUS_FS
) == SSTATUS_FS
||
411 (sstatus
& SSTATUS_XS
) == SSTATUS_XS
)
412 sstatus
|= (xlen
== 32 ? SSTATUS32_SD
: SSTATUS64_SD
);
415 case CSR_SIP
: return state
.mip
& state
.mideleg
;
416 case CSR_SIE
: return state
.mie
& state
.mideleg
;
417 case CSR_SEPC
: return state
.sepc
;
418 case CSR_SBADADDR
: return state
.sbadaddr
;
419 case CSR_STVEC
: return state
.stvec
;
422 return state
.scause
| ((state
.scause
>> (max_xlen
-1)) << (xlen
-1));
424 case CSR_SPTBR
: return state
.sptbr
;
425 case CSR_SASID
: return 0;
426 case CSR_SSCRATCH
: return state
.sscratch
;
427 case CSR_MSTATUS
: return state
.mstatus
;
428 case CSR_MIP
: return state
.mip
;
429 case CSR_MIE
: return state
.mie
;
430 case CSR_MEPC
: return state
.mepc
;
431 case CSR_MSCRATCH
: return state
.mscratch
;
432 case CSR_MCAUSE
: return state
.mcause
;
433 case CSR_MBADADDR
: return state
.mbadaddr
;
434 case CSR_MISA
: return isa
;
435 case CSR_MARCHID
: return 0;
436 case CSR_MIMPID
: return 0;
437 case CSR_MVENDORID
: return 0;
438 case CSR_MHARTID
: return id
;
439 case CSR_MTVEC
: return state
.mtvec
;
440 case CSR_MEDELEG
: return state
.medeleg
;
441 case CSR_MIDELEG
: return state
.mideleg
;
443 throw trap_illegal_instruction();
446 reg_t
illegal_instruction(processor_t
* p
, insn_t insn
, reg_t pc
)
448 throw trap_illegal_instruction();
451 insn_func_t
processor_t::decode_insn(insn_t insn
)
453 // look up opcode in hash table
454 size_t idx
= insn
.bits() % OPCODE_CACHE_SIZE
;
455 insn_desc_t desc
= opcode_cache
[idx
];
457 if (unlikely(insn
.bits() != desc
.match
)) {
458 // fall back to linear search
459 insn_desc_t
* p
= &instructions
[0];
460 while ((insn
.bits() & p
->mask
) != p
->match
)
464 if (p
->mask
!= 0 && p
> &instructions
[0]) {
465 if (p
->match
!= (p
-1)->match
&& p
->match
!= (p
+1)->match
) {
466 // move to front of opcode list to reduce miss penalty
467 while (--p
>= &instructions
[0])
469 instructions
[0] = desc
;
473 opcode_cache
[idx
] = desc
;
474 opcode_cache
[idx
].match
= insn
.bits();
477 return xlen
== 64 ? desc
.rv64
: desc
.rv32
;
480 void processor_t::register_insn(insn_desc_t desc
)
482 instructions
.push_back(desc
);
485 void processor_t::build_opcode_map()
488 bool operator()(const insn_desc_t
& lhs
, const insn_desc_t
& rhs
) {
489 if (lhs
.match
== rhs
.match
)
490 return lhs
.mask
> rhs
.mask
;
491 return lhs
.match
> rhs
.match
;
494 std::sort(instructions
.begin(), instructions
.end(), cmp());
496 for (size_t i
= 0; i
< OPCODE_CACHE_SIZE
; i
++)
497 opcode_cache
[i
] = {1, 0, &illegal_instruction
, &illegal_instruction
};
500 void processor_t::register_extension(extension_t
* x
)
502 for (auto insn
: x
->get_instructions())
505 for (auto disasm_insn
: x
->get_disasms())
506 disassembler
->add_insn(disasm_insn
);
508 throw std::logic_error("only one extension may be registered");
510 x
->set_processor(this);
513 void processor_t::register_base_instructions()
515 #define DECLARE_INSN(name, match, mask) \
516 insn_bits_t name##_match = (match), name##_mask = (mask);
517 #include "encoding.h"
520 #define DEFINE_INSN(name) \
521 REGISTER_INSN(this, name, name##_match, name##_mask)
522 #include "insn_list.h"
525 register_insn({0, 0, &illegal_instruction
, &illegal_instruction
});
529 bool processor_t::load(reg_t addr
, size_t len
, uint8_t* bytes
)
534 bool processor_t::store(reg_t addr
, size_t len
, const uint8_t* bytes
)
539 state
.mip
&= ~MIP_MSIP
;
541 state
.mip
|= MIP_MSIP
;