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)
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.sbadaddr = t.get_badaddr();
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.mbadaddr = t.get_badaddr();
reg_t s = state.mstatus;
s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE));