#include "common.h"
#include "config.h"
#include "sim.h"
+#include "htif.h"
#include "disasm.h"
#include <cinttypes>
#include <cmath>
#include <assert.h>
#include <limits.h>
#include <stdexcept>
+#include <algorithm>
+
+#undef STATE
+#define STATE state
processor_t::processor_t(sim_t* _sim, mmu_t* _mmu, uint32_t _id)
- : sim(_sim), mmu(_mmu), ext(NULL), id(_id), opcode_bits(0)
+ : sim(_sim), mmu(_mmu), ext(NULL), disassembler(new disassembler_t),
+ id(_id), run(false), debug(false), serialized(false)
{
reset(true);
mmu->set_processor(this);
#define DECLARE_INSN(name, match, mask) REGISTER_INSN(this, name, match, mask)
- #include "opcodes.h"
+ #include "encoding.h"
#undef DECLARE_INSN
+ build_opcode_map();
}
processor_t::~processor_t()
{
+#ifdef RISCV_ENABLE_HISTOGRAM
+ if (histogram_enabled)
+ {
+ fprintf(stderr, "PC Histogram size:%lu\n", pc_histogram.size());
+ for(auto iterator = pc_histogram.begin(); iterator != pc_histogram.end(); ++iterator) {
+ fprintf(stderr, "%0lx %lu\n", (iterator->first << 2), iterator->second);
+ }
+ }
+#endif
+
+ delete disassembler;
}
void state_t::reset()
// the ISA guarantees on boot that the PC is 0x2000 and the the processor
// is in supervisor mode, and in 64-bit mode, if supported, with traps
// and virtual memory disabled.
- sr = SR_S;
-#ifdef RISCV_ENABLE_64BIT
- sr |= SR_S64;
-#endif
+ sr = SR_S | SR_S64 | SR_U64;
pc = 0x2000;
// the following state is undefined upon boot-up,
XPR.reset();
FPR.reset();
- evec = 0;
epc = 0;
badvaddr = 0;
- cause = 0;
+ evec = 0;
+ ptbr = 0;
pcr_k0 = 0;
pcr_k1 = 0;
+ cause = 0;
+ tohost = 0;
+ fromhost = 0;
count = 0;
compare = 0;
- cycle = 0;
- fsr = 0;
+ fflags = 0;
+ frm = 0;
load_reservation = -1;
}
+void processor_t::set_debug(bool value)
+{
+ debug = value;
+ if (ext)
+ ext->set_debug(value);
+}
+
+void processor_t::set_histogram(bool value)
+{
+ histogram_enabled = value;
+}
+
void processor_t::reset(bool value)
{
if (run == !value)
run = !value;
state.reset(); // reset the core
- ext->reset(); // reset the extension
+ set_pcr(CSR_STATUS, state.sr);
+
+ if (ext)
+ ext->reset(); // reset the extension
}
-uint32_t processor_t::set_fsr(uint32_t val)
+struct serialize_t {};
+
+void processor_t::serialize()
{
- uint32_t old_fsr = state.fsr;
- state.fsr = val & ~FSR_ZERO; // clear FSR bits that read as zero
- return old_fsr;
+ if (serialized)
+ serialized = false;
+ else
+ serialized = true, throw serialize_t();
}
void processor_t::take_interrupt()
{
- uint32_t interrupts = (state.sr & SR_IP) >> SR_IP_SHIFT;
- interrupts &= (state.sr & SR_IM) >> SR_IM_SHIFT;
+ int irqs = ((state.sr & SR_IP) >> SR_IP_SHIFT) & (state.sr >> SR_IM_SHIFT);
+ if (likely(!irqs) || likely(!(state.sr & SR_EI)))
+ return;
- if (interrupts && (state.sr & SR_EI))
- for (int i = 0; ; i++, interrupts >>= 1)
- if (interrupts & 1)
- throw trap_t((1ULL << ((state.sr & SR_S64) ? 63 : 31)) + i);
+ for (int i = 0; ; i++)
+ if ((irqs >> i) & 1)
+ throw trap_t((1ULL << ((state.sr & SR_S64) ? 63 : 31)) + i);
}
-void processor_t::step(size_t n, bool noisy)
+static void commit_log(state_t* state, reg_t pc, insn_t insn)
{
- if(!run)
- return;
+#ifdef RISCV_ENABLE_COMMITLOG
+ if (state->sr & SR_EI) {
+ uint64_t mask = (insn.length() == 8 ? uint64_t(0) : (uint64_t(1) << (insn.length() * 8))) - 1;
+ if (state->log_reg_write.addr) {
+ fprintf(stderr, "0x%016" PRIx64 " (0x%08" PRIx64 ") %c%2" PRIu64 " 0x%016" PRIx64 "\n",
+ pc,
+ insn.bits() & mask,
+ state->log_reg_write.addr & 1 ? 'f' : 'x',
+ state->log_reg_write.addr >> 1,
+ state->log_reg_write.data);
+ } else {
+ fprintf(stderr, "0x%016" PRIx64 " (0x%08" PRIx64 ")\n", pc, insn.bits() & mask);
+ }
+ }
+ state->log_reg_write.addr = 0;
+#endif
+}
+
+inline void processor_t::update_histogram(size_t pc)
+{
+#ifdef RISCV_ENABLE_HISTOGRAM
+ size_t idx = pc >> 2;
+ pc_histogram[idx]++;
+#endif
+}
+
+static reg_t execute_insn(processor_t* p, reg_t pc, insn_fetch_t fetch)
+{
+ reg_t npc = fetch.func(p, fetch.insn, pc);
+ commit_log(p->get_state(), pc, fetch.insn);
+ p->update_histogram(pc);
+ return npc;
+}
+
+static void update_timer(state_t* state, size_t instret)
+{
+ uint64_t count0 = (uint64_t)(uint32_t)state->count;
+ state->count += instret;
+ uint64_t before = count0 - state->compare;
+ if (int64_t(before ^ (before + instret)) < 0)
+ state->sr |= (1 << (IRQ_TIMER + SR_IP_SHIFT));
+}
+
+static size_t next_timer(state_t* state)
+{
+ return state->compare - (uint32_t)state->count;
+}
- size_t i = 0;
- reg_t npc = state.pc;
+void processor_t::step(size_t n)
+{
+ size_t instret = 0;
+ reg_t pc = state.pc;
mmu_t* _mmu = mmu;
+ if (unlikely(!run || !n))
+ return;
+ n = std::min(n, next_timer(&state) | 1U);
+
try
{
take_interrupt();
- // execute_insn fetches and executes one instruction
- #define execute_insn(noisy) \
- do { \
- mmu_t::insn_fetch_t fetch = _mmu->load_insn(npc); \
- if(noisy) disasm(fetch.insn.insn, npc); \
- npc = fetch.func(this, fetch.insn.insn, npc); \
- } while(0)
-
-
- // special execute_insn for commit log dumping
-#ifdef RISCV_ENABLE_COMMITLOG
- //static disassembler disasmblr;
- #undef execute_insn
- #define execute_insn(noisy) \
- do { \
- mmu_t::insn_fetch_t fetch = _mmu->load_insn(npc); \
- if(noisy) disasm(fetch.insn.insn, npc); \
- bool in_spvr = state.sr & SR_S; \
- if (!in_spvr) fprintf(stderr, "\n0x%016" PRIx64 " (0x%08" PRIx32 ") ", npc, fetch.insn.insn.bits()); \
- /*if (!in_spvr) fprintf(stderr, "\n0x%016" PRIx64 " (0x%08" PRIx32 ") %s ", npc, fetch.insn.insn.bits(), disasmblr.disassemble(fetch.insn.insn).c_str());*/ \
- npc = fetch.func(this, fetch.insn.insn, npc); \
- } while(0)
-#endif
-
- if(noisy) for( ; i < n; i++) // print out instructions as we go
- execute_insn(true);
- else
+ if (unlikely(debug))
{
- // unrolled for speed
- for( ; n > 3 && i < n-3; i+=4)
+ while (instret++ < n)
{
- execute_insn(false);
- execute_insn(false);
- execute_insn(false);
- execute_insn(false);
+ insn_fetch_t fetch = mmu->load_insn(pc);
+ disasm(fetch.insn);
+ pc = execute_insn(this, pc, fetch);
}
- for( ; i < n; i++)
- execute_insn(false);
}
+ else while (instret < n)
+ {
+ size_t idx = _mmu->icache_index(pc);
+ auto ic_entry = _mmu->access_icache(pc);
+
+ #define ICACHE_ACCESS(idx) { \
+ insn_fetch_t fetch = ic_entry->data; \
+ ic_entry++; \
+ pc = execute_insn(this, pc, fetch); \
+ instret++; \
+ if (idx == mmu_t::ICACHE_ENTRIES-1) break; \
+ if (unlikely(ic_entry->tag != pc)) break; \
+ }
- state.pc = npc;
+ switch (idx) {
+ #include "icache.h"
+ }
+ }
}
catch(trap_t& t)
{
- take_trap(npc, t, noisy);
+ pc = take_trap(t, pc);
}
+ catch(serialize_t& s) {}
- state.cycle += i;
-
- // update timer and possibly register a timer interrupt
- uint32_t old_count = state.count;
- state.count += i;
- if(old_count < state.compare && uint64_t(old_count) + i >= state.compare)
- set_interrupt(IRQ_TIMER, true);
+ state.pc = pc;
+ update_timer(&state, instret);
}
-void processor_t::take_trap(reg_t pc, trap_t& t, bool noisy)
+reg_t processor_t::take_trap(trap_t& t, reg_t epc)
{
- if (noisy)
+ if (debug)
fprintf(stderr, "core %3d: exception %s, epc 0x%016" PRIx64 "\n",
- id, t.name(), pc);
+ id, t.name(), epc);
// switch to supervisor, set previous supervisor bit, disable interrupts
- set_pcr(PCR_SR, (((state.sr & ~SR_EI) | SR_S) & ~SR_PS & ~SR_PEI) |
- ((state.sr & SR_S) ? SR_PS : 0) |
- ((state.sr & SR_EI) ? SR_PEI : 0));
+ set_pcr(CSR_STATUS, (((state.sr & ~SR_EI) | SR_S) & ~SR_PS & ~SR_PEI) |
+ ((state.sr & SR_S) ? SR_PS : 0) |
+ ((state.sr & SR_EI) ? SR_PEI : 0));
yield_load_reservation();
state.cause = t.cause();
- state.epc = pc;
- state.pc = state.evec;
-
+ state.epc = epc;
t.side_effects(&state); // might set badvaddr etc.
+ return state.evec;
}
void processor_t::deliver_ipi()
{
if (run)
- set_pcr(PCR_CLR_IPI, 1);
+ set_pcr(CSR_CLEAR_IPI, 1);
}
-void processor_t::disasm(insn_t insn, reg_t pc)
+void processor_t::disasm(insn_t insn)
{
- // the disassembler is stateless, so we share it
- static disassembler disasm;
- fprintf(stderr, "core %3d: 0x%016" PRIx64 " (0x%08" PRIx32 ") %s\n",
- id, state.pc, insn.bits(), disasm.disassemble(insn).c_str());
+ uint64_t bits = insn.bits() & ((1ULL << (8 * insn_length(insn.bits()))) - 1);
+ fprintf(stderr, "core %3d: 0x%016" PRIx64 " (0x%08" PRIx64 ") %s\n",
+ id, state.pc, bits, disassembler->disassemble(insn).c_str());
}
-reg_t processor_t::set_pcr(int which, reg_t val)
+void processor_t::set_pcr(int which, reg_t val)
{
- reg_t old_pcr = get_pcr(which);
-
switch (which)
{
- case PCR_SR:
+ case CSR_FFLAGS:
+ state.fflags = val & (FSR_AEXC >> FSR_AEXC_SHIFT);
+ break;
+ case CSR_FRM:
+ state.frm = val & (FSR_RD >> FSR_RD_SHIFT);
+ break;
+ case CSR_FCSR:
+ state.fflags = (val & FSR_AEXC) >> FSR_AEXC_SHIFT;
+ state.frm = (val & FSR_RD) >> FSR_RD_SHIFT;
+ break;
+ case CSR_STATUS:
state.sr = (val & ~SR_IP) | (state.sr & SR_IP);
#ifndef RISCV_ENABLE_64BIT
state.sr &= ~(SR_S64 | SR_U64);
#ifndef RISCV_ENABLE_FPU
state.sr &= ~SR_EF;
#endif
-#ifndef RISCV_ENABLE_VEC
- state.sr &= ~SR_EV;
-#endif
+ if (!ext)
+ state.sr &= ~SR_EA;
state.sr &= ~SR_ZERO;
+ rv64 = (state.sr & SR_S) ? (state.sr & SR_S64) : (state.sr & SR_U64);
mmu->flush_tlb();
break;
- case PCR_EPC:
+ case CSR_EPC:
state.epc = val;
break;
- case PCR_EVEC:
- state.evec = val;
+ case CSR_EVEC:
+ state.evec = val & ~3;
break;
- case PCR_COUNT:
+ case CSR_COUNT:
state.count = val;
break;
- case PCR_COMPARE:
+ case CSR_COUNTH:
+ state.count = (val << 32) | (uint32_t)state.count;
+ break;
+ case CSR_COMPARE:
+ serialize();
set_interrupt(IRQ_TIMER, false);
state.compare = val;
break;
- case PCR_PTBR:
+ case CSR_PTBR:
state.ptbr = val & ~(PGSIZE-1);
break;
- case PCR_SEND_IPI:
+ case CSR_SEND_IPI:
sim->send_ipi(val);
break;
- case PCR_CLR_IPI:
+ case CSR_CLEAR_IPI:
set_interrupt(IRQ_IPI, val & 1);
break;
- case PCR_SUP0:
+ case CSR_SUP0:
state.pcr_k0 = val;
break;
- case PCR_SUP1:
+ case CSR_SUP1:
state.pcr_k1 = val;
break;
- case PCR_TOHOST:
+ case CSR_TOHOST:
if (state.tohost == 0)
state.tohost = val;
break;
- case PCR_FROMHOST:
- set_interrupt(IRQ_HOST, val != 0);
- state.fromhost = val;
+ case CSR_FROMHOST:
+ set_fromhost(val);
break;
}
+}
- return old_pcr;
+void processor_t::set_fromhost(reg_t val)
+{
+ set_interrupt(IRQ_HOST, val != 0);
+ state.fromhost = val;
}
reg_t processor_t::get_pcr(int which)
{
switch (which)
{
- case PCR_SR:
+ case CSR_FFLAGS:
+ require_fp;
+ return state.fflags;
+ case CSR_FRM:
+ require_fp;
+ return state.frm;
+ case CSR_FCSR:
+ require_fp;
+ return (state.fflags << FSR_AEXC_SHIFT) | (state.frm << FSR_RD_SHIFT);
+ case CSR_STATUS:
return state.sr;
- case PCR_EPC:
+ case CSR_EPC:
return state.epc;
- case PCR_BADVADDR:
+ case CSR_BADVADDR:
return state.badvaddr;
- case PCR_EVEC:
+ case CSR_EVEC:
return state.evec;
- case PCR_COUNT:
+ case CSR_CYCLE:
+ case CSR_TIME:
+ case CSR_INSTRET:
+ case CSR_COUNT:
+ serialize();
return state.count;
- case PCR_COMPARE:
+ case CSR_CYCLEH:
+ case CSR_TIMEH:
+ case CSR_INSTRETH:
+ case CSR_COUNTH:
+ if (rv64)
+ break;
+ serialize();
+ return state.count >> 32;
+ case CSR_COMPARE:
return state.compare;
- case PCR_CAUSE:
+ case CSR_CAUSE:
return state.cause;
- case PCR_PTBR:
+ case CSR_PTBR:
return state.ptbr;
- case PCR_ASID:
+ case CSR_SEND_IPI:
+ case CSR_CLEAR_IPI:
+ return 0;
+ case CSR_ASID:
return 0;
- case PCR_FATC:
+ case CSR_FATC:
mmu->flush_tlb();
return 0;
- case PCR_HARTID:
+ case CSR_HARTID:
return id;
- case PCR_IMPL:
+ case CSR_IMPL:
return 1;
- case PCR_SUP0:
+ case CSR_SUP0:
return state.pcr_k0;
- case PCR_SUP1:
+ case CSR_SUP1:
return state.pcr_k1;
- case PCR_TOHOST:
+ case CSR_TOHOST:
+ sim->get_htif()->tick(); // not necessary, but faster
return state.tohost;
- case PCR_FROMHOST:
+ case CSR_FROMHOST:
+ sim->get_htif()->tick(); // not necessary, but faster
return state.fromhost;
+ case CSR_UARCH0:
+ case CSR_UARCH1:
+ case CSR_UARCH2:
+ case CSR_UARCH3:
+ case CSR_UARCH4:
+ case CSR_UARCH5:
+ case CSR_UARCH6:
+ case CSR_UARCH7:
+ case CSR_UARCH8:
+ case CSR_UARCH9:
+ case CSR_UARCH10:
+ case CSR_UARCH11:
+ case CSR_UARCH12:
+ case CSR_UARCH13:
+ case CSR_UARCH14:
+ case CSR_UARCH15:
+ return 0;
}
- return -1;
+ throw trap_illegal_instruction();
}
void processor_t::set_interrupt(int which, bool on)
insn_func_t processor_t::decode_insn(insn_t insn)
{
- bool rv64 = (state.sr & SR_S) ? (state.sr & SR_S64) : (state.sr & SR_U64);
+ size_t mask = opcode_map.size()-1;
+ insn_desc_t* desc = opcode_map[insn.bits() & mask];
- auto key = insn.bits() & ((1L << opcode_bits)-1);
- for (auto it = opcode_map.find(key); it != opcode_map.end() && it->first == key; ++it)
- if ((insn.bits() & it->second.mask) == it->second.match)
- return rv64 ? it->second.rv64 : it->second.rv32;
+ while ((insn.bits() & desc->mask) != desc->match)
+ desc++;
- return &illegal_instruction;
+ return rv64 ? desc->rv64 : desc->rv32;
}
void processor_t::register_insn(insn_desc_t desc)
{
assert(desc.mask & 1);
- if (opcode_bits == 0 || (desc.mask & ((1L << opcode_bits)-1)) != ((1L << opcode_bits)-1))
+ instructions.push_back(desc);
+}
+
+void processor_t::build_opcode_map()
+{
+ size_t buckets = -1;
+ for (auto& inst : instructions)
+ while ((inst.mask & buckets) != buckets)
+ buckets /= 2;
+ buckets++;
+
+ struct cmp {
+ decltype(insn_desc_t::match) mask;
+ cmp(decltype(mask) mask) : mask(mask) {}
+ bool operator()(const insn_desc_t& lhs, const insn_desc_t& rhs) {
+ if ((lhs.match & mask) != (rhs.match & mask))
+ return (lhs.match & mask) < (rhs.match & mask);
+ return lhs.match < rhs.match;
+ }
+ };
+ std::sort(instructions.begin(), instructions.end(), cmp(buckets-1));
+
+ opcode_map.resize(buckets);
+ opcode_store.resize(instructions.size() + 1);
+
+ size_t j = 0;
+ for (size_t b = 0, i = 0; b < buckets; b++)
{
- unsigned x = 0;
- while ((desc.mask & ((1L << (x+1))-1)) == ((1L << (x+1))-1) &&
- (opcode_bits == 0 || x <= opcode_bits))
- x++;
- opcode_bits = x;
-
- decltype(opcode_map) new_map;
- for (auto it = opcode_map.begin(); it != opcode_map.end(); ++it)
- new_map.insert(std::make_pair(it->second.match & ((1L<<x)-1), it->second));
- opcode_map = new_map;
+ opcode_map[b] = &opcode_store[j];
+ while (i < instructions.size() && b == (instructions[i].match & (buckets-1)))
+ opcode_store[j++] = instructions[i++];
}
- opcode_map.insert(std::make_pair(desc.match & ((1L<<opcode_bits)-1), desc));
+ assert(j == opcode_store.size()-1);
+ opcode_store[j].match = opcode_store[j].mask = 0;
+ opcode_store[j].rv32 = &illegal_instruction;
+ opcode_store[j].rv64 = &illegal_instruction;
}
void processor_t::register_extension(extension_t* x)
{
for (auto insn : x->get_instructions())
register_insn(insn);
+ build_opcode_map();
+ for (auto disasm_insn : x->get_disasms())
+ disassembler->add_insn(disasm_insn);
if (ext != NULL)
throw std::logic_error("only one extension may be registered");
ext = x;
projects / riscv-isa-sim.git / blobdiff