1 // See LICENSE for license details.
22 processor_t::processor_t(const char* isa
, sim_t
* sim
, uint32_t id
)
23 : sim(sim
), ext(NULL
), disassembler(new disassembler_t
),
24 id(id
), run(false), debug(false)
26 parse_isa_string(isa
);
28 mmu
= new mmu_t(sim
->mem
, sim
->memsz
);
29 mmu
->set_processor(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* isa
)
60 const char* all_subsets
= "IMAFDC";
64 cpuid
= reg_t(2) << 62;
66 if (strncmp(p
, "RV32", 4) == 0)
67 max_xlen
= 32, cpuid
= 0, p
+= 4;
68 else if (strncmp(p
, "RV64", 4) == 0)
70 else if (strncmp(p
, "RV", 2) == 0)
75 } else if (*p
== 'G') { // treat "G" as "IMAFD"
76 tmp
= std::string("IMAFD") + (p
+1);
78 } else if (*p
!= 'I') {
82 cpuid
|= 1L << ('S' - 'A'); // advertise support for supervisor mode
85 cpuid
|= 1L << (*p
- 'A');
87 if (auto next
= strchr(all_subsets
, *p
)) {
88 all_subsets
= next
+ 1;
90 } else if (*p
== 'X') {
91 const char* ext
= p
+1, *end
= ext
;
94 register_extension(find_extension(std::string(ext
, end
- ext
).c_str())());
101 if (supports_extension('D') && !supports_extension('F'))
105 void state_t::reset()
107 memset(this, 0, sizeof(*this));
108 mstatus
= set_field(mstatus
, MSTATUS_PRV
, PRV_M
);
109 mstatus
= set_field(mstatus
, MSTATUS_PRV1
, PRV_U
);
110 mstatus
= set_field(mstatus
, MSTATUS_PRV2
, PRV_U
);
111 pc
= DEFAULT_MTVEC
+ 0x100;
112 load_reservation
= -1;
115 void processor_t::set_debug(bool value
)
119 ext
->set_debug(value
);
122 void processor_t::set_histogram(bool value
)
124 histogram_enabled
= value
;
125 #ifndef RISCV_ENABLE_HISTOGRAM
127 fprintf(stderr
, "PC Histogram support has not been properly enabled;");
128 fprintf(stderr
, " please re-build the riscv-isa-run project using \"configure --enable-histogram\".\n");
133 void processor_t::reset(bool value
)
140 set_csr(CSR_MSTATUS
, state
.mstatus
);
143 ext
->reset(); // reset the extension
146 void processor_t::raise_interrupt(reg_t which
)
148 throw trap_t(((reg_t
)1 << (max_xlen
-1)) | which
);
151 void processor_t::take_interrupt()
153 int priv
= get_field(state
.mstatus
, MSTATUS_PRV
);
154 int ie
= get_field(state
.mstatus
, MSTATUS_IE
);
155 reg_t interrupts
= state
.mie
& state
.mip
;
157 if (priv
< PRV_M
|| (priv
== PRV_M
&& ie
)) {
158 if (interrupts
& MIP_MSIP
)
159 raise_interrupt(IRQ_SOFT
);
161 if (interrupts
& MIP_MTIP
)
162 raise_interrupt(IRQ_TIMER
);
164 if (state
.fromhost
!= 0)
165 raise_interrupt(IRQ_HOST
);
168 if (priv
< PRV_S
|| (priv
== PRV_S
&& ie
)) {
169 if (interrupts
& MIP_SSIP
)
170 raise_interrupt(IRQ_SOFT
);
172 if (interrupts
& MIP_STIP
)
173 raise_interrupt(IRQ_TIMER
);
177 void processor_t::check_timer()
179 if (sim
->rtc
>= state
.mtimecmp
)
180 state
.mip
|= MIP_MTIP
;
183 void processor_t::push_privilege_stack()
185 reg_t s
= state
.mstatus
;
186 s
= set_field(s
, MSTATUS_PRV2
, get_field(state
.mstatus
, MSTATUS_PRV1
));
187 s
= set_field(s
, MSTATUS_IE2
, get_field(state
.mstatus
, MSTATUS_IE1
));
188 s
= set_field(s
, MSTATUS_PRV1
, get_field(state
.mstatus
, MSTATUS_PRV
));
189 s
= set_field(s
, MSTATUS_IE1
, get_field(state
.mstatus
, MSTATUS_IE
));
190 s
= set_field(s
, MSTATUS_PRV
, PRV_M
);
191 s
= set_field(s
, MSTATUS_MPRV
, 0);
192 s
= set_field(s
, MSTATUS_IE
, 0);
193 set_csr(CSR_MSTATUS
, s
);
196 void processor_t::pop_privilege_stack()
198 reg_t s
= state
.mstatus
;
199 s
= set_field(s
, MSTATUS_PRV
, get_field(state
.mstatus
, MSTATUS_PRV1
));
200 s
= set_field(s
, MSTATUS_IE
, get_field(state
.mstatus
, MSTATUS_IE1
));
201 s
= set_field(s
, MSTATUS_PRV1
, get_field(state
.mstatus
, MSTATUS_PRV2
));
202 s
= set_field(s
, MSTATUS_IE1
, get_field(state
.mstatus
, MSTATUS_IE2
));
203 s
= set_field(s
, MSTATUS_PRV2
, PRV_U
);
204 s
= set_field(s
, MSTATUS_IE2
, 1);
205 set_csr(CSR_MSTATUS
, s
);
208 void processor_t::take_trap(trap_t
& t
, reg_t epc
)
211 fprintf(stderr
, "core %3d: exception %s, epc 0x%016" PRIx64
"\n",
214 state
.pc
= DEFAULT_MTVEC
+ 0x40 * get_field(state
.mstatus
, MSTATUS_PRV
);
215 push_privilege_stack();
216 yield_load_reservation();
217 state
.mcause
= t
.cause();
219 t
.side_effects(&state
); // might set badvaddr etc.
222 void processor_t::deliver_ipi()
224 state
.mip
|= MIP_MSIP
;
227 void processor_t::disasm(insn_t insn
)
229 uint64_t bits
= insn
.bits() & ((1ULL << (8 * insn_length(insn
.bits()))) - 1);
230 fprintf(stderr
, "core %3d: 0x%016" PRIx64
" (0x%08" PRIx64
") %s\n",
231 id
, state
.pc
, bits
, disassembler
->disassemble(insn
).c_str());
234 static bool validate_priv(reg_t priv
)
236 return priv
== PRV_U
|| priv
== PRV_S
|| priv
== PRV_M
;
239 static bool validate_vm(int max_xlen
, reg_t vm
)
241 if (max_xlen
== 64 && (vm
== VM_SV39
|| vm
== VM_SV48
))
243 if (max_xlen
== 32 && vm
== VM_SV32
)
245 return vm
== VM_MBARE
;
248 void processor_t::set_csr(int which
, reg_t val
)
254 state
.fflags
= val
& (FSR_AEXC
>> FSR_AEXC_SHIFT
);
258 state
.frm
= val
& (FSR_RD
>> FSR_RD_SHIFT
);
262 state
.fflags
= (val
& FSR_AEXC
) >> FSR_AEXC_SHIFT
;
263 state
.frm
= (val
& FSR_RD
) >> FSR_RD_SHIFT
;
267 // this implementation ignores writes to MTIME
271 // this implementation ignores writes to MTIME
276 state
.sutime_delta
= (uint32_t)val
| (state
.sutime_delta
>> 32 << 32);
278 state
.sutime_delta
= val
;
281 val
= ((val
<< 32) - sim
->rtc
) >> 32;
282 state
.sutime_delta
= (val
<< 32) | (uint32_t)state
.sutime_delta
;
286 val
-= state
.minstret
;
288 state
.suinstret_delta
= (uint32_t)val
| (state
.suinstret_delta
>> 32 << 32);
290 state
.suinstret_delta
= val
;
294 val
= ((val
<< 32) - state
.minstret
) >> 32;
295 state
.suinstret_delta
= (val
<< 32) | (uint32_t)state
.suinstret_delta
;
298 if ((val
^ state
.mstatus
) & (MSTATUS_VM
| MSTATUS_PRV
| MSTATUS_PRV1
| MSTATUS_MPRV
))
301 reg_t mask
= MSTATUS_IE
| MSTATUS_IE1
| MSTATUS_IE2
| MSTATUS_MPRV
302 | MSTATUS_FS
| (ext
? MSTATUS_XS
: 0);
304 if (validate_vm(max_xlen
, get_field(val
, MSTATUS_VM
)))
306 if (validate_priv(get_field(val
, MSTATUS_PRV
)))
308 if (validate_priv(get_field(val
, MSTATUS_PRV1
)))
309 mask
|= MSTATUS_PRV1
;
310 if (validate_priv(get_field(val
, MSTATUS_PRV2
)))
311 mask
|= MSTATUS_PRV2
;
313 state
.mstatus
= (state
.mstatus
& ~mask
) | (val
& mask
);
315 bool dirty
= (state
.mstatus
& MSTATUS_FS
) == MSTATUS_FS
;
316 dirty
|= (state
.mstatus
& MSTATUS_XS
) == MSTATUS_XS
;
318 state
.mstatus
= set_field(state
.mstatus
, MSTATUS32_SD
, dirty
);
320 state
.mstatus
= set_field(state
.mstatus
, MSTATUS64_SD
, dirty
);
322 // spike supports the notion of xlen < max_xlen, but current priv spec
323 // doesn't provide a mechanism to run RV32 software on an RV64 machine
328 reg_t mask
= MIP_SSIP
| MIP_MSIP
| MIP_STIP
;
329 state
.mip
= (state
.mip
& ~mask
) | (val
& mask
);
333 reg_t mask
= MIP_SSIP
| MIP_MSIP
| MIP_STIP
| MIP_MTIP
;
334 state
.mie
= (state
.mie
& ~mask
) | (val
& mask
);
338 reg_t ms
= state
.mstatus
;
339 ms
= set_field(ms
, MSTATUS_IE
, get_field(val
, SSTATUS_IE
));
340 ms
= set_field(ms
, MSTATUS_IE1
, get_field(val
, SSTATUS_PIE
));
341 ms
= set_field(ms
, MSTATUS_PRV1
, get_field(val
, SSTATUS_PS
));
342 ms
= set_field(ms
, MSTATUS_FS
, get_field(val
, SSTATUS_FS
));
343 ms
= set_field(ms
, MSTATUS_XS
, get_field(val
, SSTATUS_XS
));
344 ms
= set_field(ms
, MSTATUS_MPRV
, get_field(val
, SSTATUS_MPRV
));
345 return set_csr(CSR_MSTATUS
, ms
);
348 reg_t mask
= MIP_SSIP
;
349 state
.mip
= (state
.mip
& ~mask
) | (val
& mask
);
353 reg_t mask
= MIP_SSIP
| MIP_STIP
;
354 state
.mie
= (state
.mie
& ~mask
) | (val
& mask
);
357 case CSR_SEPC
: state
.sepc
= val
; break;
358 case CSR_STVEC
: state
.stvec
= val
>> 2 << 2; break;
359 case CSR_SPTBR
: state
.sptbr
= zext_xlen(val
& -PGSIZE
); break;
360 case CSR_SSCRATCH
: state
.sscratch
= val
; break;
361 case CSR_MEPC
: state
.mepc
= val
; break;
362 case CSR_MSCRATCH
: state
.mscratch
= val
; break;
363 case CSR_MCAUSE
: state
.mcause
= val
; break;
364 case CSR_MBADADDR
: state
.mbadaddr
= val
; break;
366 state
.mip
&= ~MIP_MTIP
;
367 state
.mtimecmp
= val
;
369 case CSR_SEND_IPI
: sim
->send_ipi(val
); break;
371 if (state
.tohost
== 0)
374 case CSR_MFROMHOST
: state
.fromhost
= val
; break;
378 reg_t
processor_t::get_csr(int which
)
384 if (!supports_extension('F'))
389 if (!supports_extension('F'))
394 if (!supports_extension('F'))
396 return (state
.fflags
<< FSR_AEXC_SHIFT
) | (state
.frm
<< FSR_RD_SHIFT
);
404 return sim
->rtc
>> 32;
407 return sim
->rtc
+ state
.sutime_delta
;
412 return state
.minstret
+ state
.suinstret_delta
;
417 return (sim
->rtc
+ state
.sutime_delta
) >> 32;
424 return (state
.minstret
+ state
.suinstret_delta
) >> 32;
427 ss
= set_field(ss
, SSTATUS_IE
, get_field(state
.mstatus
, MSTATUS_IE
));
428 ss
= set_field(ss
, SSTATUS_PIE
, get_field(state
.mstatus
, MSTATUS_IE1
));
429 ss
= set_field(ss
, SSTATUS_PS
, get_field(state
.mstatus
, MSTATUS_PRV1
));
430 ss
= set_field(ss
, SSTATUS_FS
, get_field(state
.mstatus
, MSTATUS_FS
));
431 ss
= set_field(ss
, SSTATUS_XS
, get_field(state
.mstatus
, MSTATUS_XS
));
432 ss
= set_field(ss
, SSTATUS_MPRV
, get_field(state
.mstatus
, MSTATUS_MPRV
));
433 if (get_field(state
.mstatus
, MSTATUS64_SD
))
434 ss
= set_field(ss
, (xlen
== 32 ? SSTATUS32_SD
: SSTATUS64_SD
), 1);
437 case CSR_SIP
: return state
.mip
& (MIP_SSIP
| MIP_STIP
);
438 case CSR_SIE
: return state
.mie
& (MIP_SSIP
| MIP_STIP
);
439 case CSR_SEPC
: return state
.sepc
;
440 case CSR_SBADADDR
: return state
.sbadaddr
;
441 case CSR_STVEC
: return state
.stvec
;
444 return state
.scause
| ((state
.scause
>> (max_xlen
-1)) << (xlen
-1));
446 case CSR_SPTBR
: return state
.sptbr
;
447 case CSR_SASID
: return 0;
448 case CSR_SSCRATCH
: return state
.sscratch
;
449 case CSR_MSTATUS
: return state
.mstatus
;
450 case CSR_MIP
: return state
.mip
;
451 case CSR_MIE
: return state
.mie
;
452 case CSR_MEPC
: return state
.mepc
;
453 case CSR_MSCRATCH
: return state
.mscratch
;
454 case CSR_MCAUSE
: return state
.mcause
;
455 case CSR_MBADADDR
: return state
.mbadaddr
;
456 case CSR_MTIMECMP
: return state
.mtimecmp
;
457 case CSR_MCPUID
: return cpuid
;
458 case CSR_MIMPID
: return IMPL_ROCKET
;
459 case CSR_MHARTID
: return id
;
460 case CSR_MTVEC
: return DEFAULT_MTVEC
;
461 case CSR_MTDELEG
: return 0;
463 sim
->get_htif()->tick(); // not necessary, but faster
466 sim
->get_htif()->tick(); // not necessary, but faster
467 return state
.fromhost
;
468 case CSR_SEND_IPI
: return 0;
487 throw trap_illegal_instruction();
490 reg_t
illegal_instruction(processor_t
* p
, insn_t insn
, reg_t pc
)
492 throw trap_illegal_instruction();
495 insn_func_t
processor_t::decode_insn(insn_t insn
)
497 // look up opcode in hash table
498 size_t idx
= insn
.bits() % OPCODE_CACHE_SIZE
;
499 insn_desc_t desc
= opcode_cache
[idx
];
501 if (unlikely(insn
.bits() != desc
.match
)) {
502 // fall back to linear search
503 insn_desc_t
* p
= &instructions
[0];
504 while ((insn
.bits() & p
->mask
) != p
->match
)
508 if (p
->mask
!= 0 && p
> &instructions
[0]) {
509 if (p
->match
!= (p
-1)->match
&& p
->match
!= (p
+1)->match
) {
510 // move to front of opcode list to reduce miss penalty
511 while (--p
>= &instructions
[0])
513 instructions
[0] = desc
;
517 opcode_cache
[idx
] = desc
;
518 opcode_cache
[idx
].match
= insn
.bits();
521 return xlen
== 64 ? desc
.rv64
: desc
.rv32
;
524 void processor_t::register_insn(insn_desc_t desc
)
526 instructions
.push_back(desc
);
529 void processor_t::build_opcode_map()
532 bool operator()(const insn_desc_t
& lhs
, const insn_desc_t
& rhs
) {
533 if (lhs
.match
== rhs
.match
)
534 return lhs
.mask
> rhs
.mask
;
535 return lhs
.match
> rhs
.match
;
538 std::sort(instructions
.begin(), instructions
.end(), cmp());
540 for (size_t i
= 0; i
< OPCODE_CACHE_SIZE
; i
++)
541 opcode_cache
[i
] = {1, 0, &illegal_instruction
, &illegal_instruction
};
544 void processor_t::register_extension(extension_t
* x
)
546 for (auto insn
: x
->get_instructions())
549 for (auto disasm_insn
: x
->get_disasms())
550 disassembler
->add_insn(disasm_insn
);
552 throw std::logic_error("only one extension may be registered");
554 x
->set_processor(this);
557 void processor_t::register_base_instructions()
559 #define DECLARE_INSN(name, match, mask) \
560 insn_bits_t name##_match = (match), name##_mask = (mask);
561 #include "encoding.h"
564 #define DEFINE_INSN(name) \
565 REGISTER_INSN(this, name, name##_match, name##_mask)
566 #include "insn_list.h"
569 register_insn({0, 0, &illegal_instruction
, &illegal_instruction
});