#include "config.h"
#include "sim.h"
#include "mmu.h"
-#include "htif.h"
#include "disasm.h"
+#include "gdbserver.h"
#include <cinttypes>
#include <cmath>
#include <cstdlib>
#undef STATE
#define STATE state
-processor_t::processor_t(const char* isa, sim_t* sim, uint32_t id)
- : sim(sim), ext(NULL), disassembler(new disassembler_t),
- id(id), run(false), debug(false)
+processor_t::processor_t(const char* isa, sim_t* sim, uint32_t id,
+ bool halt_on_reset)
+ : debug(false), sim(sim), ext(NULL), disassembler(new disassembler_t),
+ id(id), halt_on_reset(halt_on_reset)
{
parse_isa_string(isa);
mmu = new mmu_t(sim, this);
- reset(true);
+ reset();
register_base_instructions();
}
memset(this, 0, sizeof(*this));
prv = PRV_M;
pc = DEFAULT_RSTVEC;
+ mtvec = DEFAULT_MTVEC;
load_reservation = -1;
}
#endif
}
-void processor_t::reset(bool value)
+void processor_t::reset()
{
- if (run == !value)
- return;
- run = !value;
-
state.reset();
+ state.dcsr.halt = halt_on_reset;
+ halt_on_reset = false;
set_csr(CSR_MSTATUS, state.mstatus);
if (ext)
state.prv = prv;
}
+void processor_t::enter_debug_mode(uint8_t cause)
+{
+ state.dcsr.cause = cause;
+ state.dcsr.prv = state.prv;
+ set_privilege(PRV_M);
+ state.dpc = state.pc;
+ state.pc = DEBUG_ROM_START;
+ //debug = true; // TODO
+}
+
void processor_t::take_trap(trap_t& t, reg_t epc)
{
- if (debug)
+ if (debug) {
fprintf(stderr, "core %3d: exception %s, epc 0x%016" PRIx64 "\n",
id, t.name(), epc);
+ if (t.has_badaddr())
+ fprintf(stderr, "core %3d: badaddr 0x%016" PRIx64 "\n", id,
+ t.get_badaddr());
+ }
+
+ if (t.cause() == CAUSE_BREAKPOINT && (
+ (state.prv == PRV_M && state.dcsr.ebreakm) ||
+ (state.prv == PRV_H && state.dcsr.ebreakh) ||
+ (state.prv == PRV_S && state.dcsr.ebreaks) ||
+ (state.prv == PRV_U && state.dcsr.ebreaku))) {
+ enter_debug_mode(DCSR_CAUSE_SWBP);
+ return;
+ }
+
+ if (state.dcsr.cause) {
+ state.pc = DEBUG_ROM_EXCEPTION;
+ return;
+ }
// by default, trap to M-mode, unless delegated to S-mode
reg_t bit = t.cause();
set_privilege(PRV_S);
} else {
state.pc = state.mtvec;
- state.mcause = t.cause();
state.mepc = epc;
+ state.mcause = t.cause();
if (t.has_badaddr())
state.mbadaddr = t.get_badaddr();
return vm == VM_MBARE;
}
+int processor_t::paddr_bits()
+{
+ assert(xlen == max_xlen);
+ return max_xlen == 64 ? 50 : 34;
+}
+
void processor_t::set_csr(int which, reg_t val)
{
val = zext_xlen(val);
- reg_t delegable_ints = MIP_SSIP | MIP_STIP | (1 << IRQ_HOST) | (1 << IRQ_COP);
+ reg_t delegable_ints = MIP_SSIP | MIP_STIP | MIP_SEIP | (1 << IRQ_COP);
reg_t all_ints = delegable_ints | MIP_MSIP | MIP_MTIP;
switch (which)
{
break;
}
case CSR_MIP: {
- reg_t mask = MIP_SSIP | MIP_STIP | MIP_MSIP;
+ reg_t mask = MIP_SSIP | MIP_STIP;
state.mip = (state.mip & ~mask) | (val & mask);
break;
}
- case CSR_MIPI:
- state.mip = set_field(state.mip, MIP_MSIP, val & 1);
- break;
case CSR_MIE:
state.mie = (state.mie & ~all_ints) | (val & all_ints);
break;
case CSR_SIE:
return set_csr(CSR_MIE,
(state.mie & ~state.mideleg) | (val & state.mideleg));
+ case CSR_SPTBR: {
+ // upper bits of sptbr are the ASID; we only support ASID = 0
+ state.sptbr = val & (((reg_t)1 << (paddr_bits() - PGSHIFT)) - 1);
+ break;
+ }
case CSR_SEPC: state.sepc = val; break;
case CSR_STVEC: state.stvec = val >> 2 << 2; break;
- case CSR_SPTBR: state.sptbr = val; break;
case CSR_SSCRATCH: state.sscratch = val; break;
case CSR_SCAUSE: state.scause = val; break;
case CSR_SBADADDR: state.sbadaddr = val; break;
case CSR_MSCRATCH: state.mscratch = val; break;
case CSR_MCAUSE: state.mcause = val; break;
case CSR_MBADADDR: state.mbadaddr = val; break;
- case CSR_MTOHOST:
- if (state.tohost == 0)
- state.tohost = val;
+ case CSR_DCSR:
+ state.dcsr.prv = get_field(val, DCSR_PRV);
+ state.dcsr.step = get_field(val, DCSR_STEP);
+ // TODO: ndreset and fullreset
+ state.dcsr.ebreakm = get_field(val, DCSR_EBREAKM);
+ state.dcsr.ebreakh = get_field(val, DCSR_EBREAKH);
+ state.dcsr.ebreaks = get_field(val, DCSR_EBREAKS);
+ state.dcsr.ebreaku = get_field(val, DCSR_EBREAKU);
+ state.dcsr.halt = get_field(val, DCSR_HALT);
break;
- case CSR_MFROMHOST:
- state.mip = (state.mip & ~(1 << IRQ_HOST)) | (val ? (1 << IRQ_HOST) : 0);
- state.fromhost = val;
+ case CSR_DPC:
+ state.dpc = val;
+ break;
+ case CSR_DSCRATCH:
+ state.dscratch = val;
break;
}
}
return state.scause | ((state.scause >> (max_xlen-1)) << (xlen-1));
return state.scause;
case CSR_SPTBR: return state.sptbr;
- case CSR_SASID: return 0;
case CSR_SSCRATCH: return state.sscratch;
case CSR_MSTATUS: return state.mstatus;
case CSR_MIP: return state.mip;
- case CSR_MIPI: return 0;
case CSR_MIE: return state.mie;
case CSR_MEPC: return state.mepc;
case CSR_MSCRATCH: return state.mscratch;
case CSR_MTVEC: return state.mtvec;
case CSR_MEDELEG: return state.medeleg;
case CSR_MIDELEG: return state.mideleg;
- case CSR_MTOHOST:
- sim->get_htif()->tick(); // not necessary, but faster
- return state.tohost;
- case CSR_MFROMHOST:
- sim->get_htif()->tick(); // not necessary, but faster
- return state.fromhost;
+ case CSR_TDRSELECT: return 0;
+ case CSR_DCSR:
+ {
+ uint32_t v = 0;
+ v = set_field(v, DCSR_XDEBUGVER, 1);
+ v = set_field(v, DCSR_HWBPCOUNT, 0);
+ v = set_field(v, DCSR_NDRESET, 0);
+ v = set_field(v, DCSR_FULLRESET, 0);
+ v = set_field(v, DCSR_PRV, state.dcsr.prv);
+ v = set_field(v, DCSR_STEP, state.dcsr.step);
+ v = set_field(v, DCSR_DEBUGINT, sim->debug_module.get_interrupt(id));
+ v = set_field(v, DCSR_STOPCYCLE, 0);
+ v = set_field(v, DCSR_STOPTIME, 0);
+ v = set_field(v, DCSR_EBREAKM, state.dcsr.ebreakm);
+ v = set_field(v, DCSR_EBREAKH, state.dcsr.ebreakh);
+ v = set_field(v, DCSR_EBREAKS, state.dcsr.ebreaks);
+ v = set_field(v, DCSR_EBREAKU, state.dcsr.ebreaku);
+ v = set_field(v, DCSR_HALT, state.dcsr.halt);
+ v = set_field(v, DCSR_CAUSE, state.dcsr.cause);
+ return v;
+ }
+ case CSR_DPC:
+ return state.dpc;
+ case CSR_DSCRATCH:
+ return state.dscratch;
}
throw trap_illegal_instruction();
}
bool processor_t::load(reg_t addr, size_t len, uint8_t* bytes)
{
- try {
- auto res = get_csr(addr / (max_xlen / 8));
- memcpy(bytes, &res, len);
- return true;
- } catch (trap_illegal_instruction& t) {
- return false;
- }
+ return false;
}
bool processor_t::store(reg_t addr, size_t len, const uint8_t* bytes)
{
- try {
- reg_t value = 0;
- memcpy(&value, bytes, len);
- set_csr(addr / (max_xlen / 8), value);
- return true;
- } catch (trap_illegal_instruction& t) {
- return false;
+ switch (addr)
+ {
+ case 0:
+ state.mip &= ~MIP_MSIP;
+ if (bytes[0] & 1)
+ state.mip |= MIP_MSIP;
+ return true;
+
+ default:
+ return false;
}
}
projects / riscv-isa-sim.git / blobdiff