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Handle double-RED abort conditions by stopping the CPU and reporting a PANIC

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This commit is contained in:
Jeff Parsons 2016-12-01 20:07:33 -08:00 • committed by Jeff Parsons
commit 02b1b8a34a
12 changed files with 180 additions and 174 deletions
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23
modules/pdp11/lib/defines.js
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@ -219,18 +219,20 @@ var PDP11 = {
* immediate (thrown) traps, as they are considered ABORTs; the rest generate synchronous traps.
*/
REASON: {
ABORT: -1, // immediate MMU fault
ILLEGAL: -2, // immediate invalid opcode (BUS)
RED: -3, // immediate stack overflow fault (BUS)
YELLOW: -4, // deferred stack overflow fault (BUS)
FAULT: -5, // deferred MMU fault
TRACE: -6, // deferred TF fault (BPT)
HALT: -7, // illegal HALT (BUS)
OPCODE: -8, // opcode-generated trap (eg, BPT, EMT, IOT, TRAP, or RESERVED opcode)
INTERRUPT: -9, // device-generated trap (vector is device-specific)
PANIC: -1, // immediate halt (internal error)
ABORT: -2, // immediate MMU fault
ILLEGAL: -3, // immediate invalid opcode (BUS)
RED: -4, // immediate stack overflow fault (BUS)
YELLOW: -5, // deferred stack overflow fault (BUS)
FAULT: -6, // deferred MMU fault
TRACE: -7, // deferred TF fault (BPT)
HALT: -8, // illegal HALT (BUS)
OPCODE: -9, // opcode-generated trap (eg, BPT, EMT, IOT, TRAP, or RESERVED opcode)
INTERRUPT: -10, // device-generated trap (vector is device-specific)
},
REASONS: [
"UNKNOWN",
"PANIC",
"ABORT",
"ILLEGAL",
"RED",
@ -271,7 +273,8 @@ var PDP11 = {
TRAP_MMU: 0x0040,
TRAP_MASK: 0x0070,
TRAP_LAST: 0x0080, // set if last operation was a trap (see trapLast for the vector, and trapReason for the reason)
NO_FLAGS: 0x0100 // set whenever the PSW is written directly, requiring all updateXXXFlags() functions to leave flags unchanged
TRAP_RED: 0x0100, // set whenever a RED trap occurs, used to catch double RED traps (time to PANIC)
NO_FLAGS: 0x0200 // set whenever the PSW is written directly, requiring all updateXXXFlags() functions to leave flags unchanged
},
/*
* Opcode reg (opcode bits 2-0)