if (supports_extension('Q') && max_xlen < 64)
bad_isa_string(str);
- // advertise support for supervisor and user modes
- isa |= 1L << ('s' - 'a');
- isa |= 1L << ('u' - 'a');
-
max_isa = isa;
}
reg_t sie = get_field(state.mstatus, MSTATUS_SIE);
reg_t s_enabled = state.prv < PRV_S || (state.prv == PRV_S && sie);
+ // M-ints have highest priority; consider S-ints only if no M-ints pending
if (enabled_interrupts == 0)
enabled_interrupts = pending_interrupts & state.mideleg & -s_enabled;
- if (state.dcsr.cause == 0 && enabled_interrupts)
+ if (state.dcsr.cause == 0 && enabled_interrupts) {
+ // nonstandard interrupts have highest priority
+ if (enabled_interrupts >> IRQ_M_EXT)
+ enabled_interrupts = enabled_interrupts >> IRQ_M_EXT << IRQ_M_EXT;
+ // external interrupts have next-highest priority
+ else if (enabled_interrupts & (MIP_MEIP | MIP_SEIP))
+ enabled_interrupts = enabled_interrupts & (MIP_MEIP | MIP_SEIP);
+ // software interrupts have next-highest priority
+ else if (enabled_interrupts & (MIP_MSIP | MIP_SSIP))
+ enabled_interrupts = enabled_interrupts & (MIP_MSIP | MIP_SSIP);
+ // timer interrupts have next-highest priority
+ else if (enabled_interrupts & (MIP_MTIP | MIP_STIP))
+ enabled_interrupts = enabled_interrupts & (MIP_MTIP | MIP_STIP);
+ else
+ abort();
+
throw trap_t(((reg_t)1 << (max_xlen-1)) | ctz(enabled_interrupts));
+ }
}
static int xlen_to_uxl(int xlen)
abort();
}
-void processor_t::set_privilege(reg_t prv)
+reg_t processor_t::legalize_privilege(reg_t prv)
{
assert(prv <= PRV_M);
- if (prv == PRV_H)
- prv = PRV_U;
+
+ if (!supports_extension('U'))
+ return PRV_M;
+
+ if (prv == PRV_H || !supports_extension('S'))
+ return PRV_U;
+
+ return prv;
+}
+
+void processor_t::set_privilege(reg_t prv)
+{
mmu->flush_tlb();
- state.prv = prv;
+ state.prv = legalize_privilege(prv);
}
void processor_t::enter_debug_mode(uint8_t cause)
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.has_tval())
+ fprintf(stderr, "core %3d: tval 0x%016" PRIx64 "\n", id,
+ t.get_tval());
}
if (state.dcsr.cause) {
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);
state.pc = state.stvec;
state.scause = t.cause();
state.sepc = epc;
- if (t.has_badaddr())
- state.sbadaddr = t.get_badaddr();
+ state.stval = t.get_tval();
reg_t s = state.mstatus;
s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE));
state.pc = (state.mtvec & ~(reg_t)1) + vector;
state.mepc = epc;
state.mcause = t.cause();
- if (t.has_badaddr())
- state.mbadaddr = t.get_badaddr();
+ state.mtval = t.get_tval();
reg_t s = state.mstatus;
s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE));
mmu->flush_tlb();
reg_t mask = MSTATUS_SIE | MSTATUS_SPIE | MSTATUS_MIE | MSTATUS_MPIE
- | MSTATUS_SPP | MSTATUS_FS | MSTATUS_MPRV | MSTATUS_SUM
- | MSTATUS_MPP | MSTATUS_MXR | MSTATUS_TW | MSTATUS_TVM
+ | MSTATUS_FS | MSTATUS_MPRV | MSTATUS_SUM
+ | MSTATUS_MXR | MSTATUS_TW | MSTATUS_TVM
| MSTATUS_TSR | MSTATUS_UXL | MSTATUS_SXL |
(ext ? MSTATUS_XS : 0);
+ reg_t requested_mpp = legalize_privilege(get_field(val, MSTATUS_MPP));
+ state.mstatus = set_field(state.mstatus, MSTATUS_MPP, requested_mpp);
+ if (supports_extension('S'))
+ mask |= MSTATUS_SPP;
+
state.mstatus = (state.mstatus & ~mask) | (val & mask);
bool dirty = (state.mstatus & MSTATUS_FS) == MSTATUS_FS;
else
state.mstatus = set_field(state.mstatus, MSTATUS64_SD, dirty);
+ state.mstatus = set_field(state.mstatus, MSTATUS_UXL, xlen_to_uxl(max_xlen));
state.mstatus = set_field(state.mstatus, MSTATUS_UXL, xlen_to_uxl(max_xlen));
state.mstatus = set_field(state.mstatus, MSTATUS_SXL, xlen_to_uxl(max_xlen));
// U-XLEN == S-XLEN == M-XLEN
case CSR_SIE:
return set_csr(CSR_MIE,
(state.mie & ~state.mideleg) | (val & state.mideleg));
- case CSR_SPTBR: {
+ case CSR_SATP: {
mmu->flush_tlb();
if (max_xlen == 32)
- state.sptbr = val & (SPTBR32_PPN | SPTBR32_MODE);
- if (max_xlen == 64 && (get_field(val, SPTBR64_MODE) == SPTBR_MODE_OFF ||
- get_field(val, SPTBR64_MODE) == SPTBR_MODE_SV39 ||
- get_field(val, SPTBR64_MODE) == SPTBR_MODE_SV48))
- state.sptbr = val & (SPTBR64_PPN | SPTBR64_MODE);
+ state.satp = val & (SATP32_PPN | SATP32_MODE);
+ if (max_xlen == 64 && (get_field(val, SATP64_MODE) == SATP_MODE_OFF ||
+ get_field(val, SATP64_MODE) == SATP_MODE_SV39 ||
+ get_field(val, SATP64_MODE) == SATP_MODE_SV48))
+ state.satp = val & (SATP64_PPN | SATP64_MODE);
break;
}
case CSR_SEPC: state.sepc = val; break;
case CSR_STVEC: state.stvec = val >> 2 << 2; break;
case CSR_SSCRATCH: state.sscratch = val; break;
case CSR_SCAUSE: state.scause = val; break;
- case CSR_SBADADDR: state.sbadaddr = val; break;
+ case CSR_STVAL: state.stval = val; break;
case CSR_MEPC: state.mepc = val; break;
case CSR_MTVEC: state.mtvec = val & ~(reg_t)2; break;
case CSR_MSCRATCH: state.mscratch = val; break;
case CSR_MCAUSE: state.mcause = val; break;
- case CSR_MBADADDR: state.mbadaddr = val; break;
+ case CSR_MTVAL: state.mtval = val; break;
case CSR_MISA: {
if (!(val & (1L << ('F' - 'A'))))
val &= ~(1L << ('D' - 'A'));
case CSR_SIP: return state.mip & state.mideleg;
case CSR_SIE: return state.mie & state.mideleg;
case CSR_SEPC: return state.sepc;
- case CSR_SBADADDR: return state.sbadaddr;
+ case CSR_STVAL: return state.stval;
case CSR_STVEC: return state.stvec;
case CSR_SCAUSE:
if (max_xlen > xlen)
return state.scause | ((state.scause >> (max_xlen-1)) << (xlen-1));
return state.scause;
- case CSR_SPTBR:
+ case CSR_SATP:
if (get_field(state.mstatus, MSTATUS_TVM))
require_privilege(PRV_M);
- return state.sptbr;
+ return state.satp;
case CSR_SSCRATCH: return state.sscratch;
case CSR_MSTATUS: return state.mstatus;
case CSR_MIP: return state.mip;
case CSR_MEPC: return state.mepc;
case CSR_MSCRATCH: return state.mscratch;
case CSR_MCAUSE: return state.mcause;
- case CSR_MBADADDR: return state.mbadaddr;
+ case CSR_MTVAL: return state.mtval;
case CSR_MISA: return isa;
case CSR_MARCHID: return 0;
case CSR_MIMPID: return 0;
projects / riscv-isa-sim.git / blobdiff