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Fixed RTI on older PDP-11s (ie, 11/20); the old RTI behaves like the new RTT, which did not exist on older machines

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This commit is contained in:
Jeff 2016-11-13 21:17:46 -08:00 • committed by Jeff Parsons
commit 0607d65b70
8 changed files with 163 additions and 140 deletions
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89
modules/pdp11/lib/defines.js
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@ -158,7 +158,7 @@ var PDP11 = {
MASK: 0x3
},
/*
* Processor Status flag definitions (stored in regPSW)
* Processor Status Word definitions (stored in regPSW)
*/
PSW: {
CF: 0x0001, // bit 0 (000001) Carry Flag
@ -185,6 +185,49 @@ var PDP11 = {
CMODE: 14
}
},
/*
* PDP-11 trap vectors
*/
TRAP: {
UNDEFINED: 0x00, // 000 (reserved)
BUS: 0x04, // 004 unaligned address, non-existent memory, illegal instruction, etc
RESERVED: 0x08, // 010 reserved instructions
BPT: 0x0C, // 014 BPT: breakpoint trap (trace)
IOT: 0x10, // 020 IOT: input/output trap
PF: 0x14, // 024 power fail
EMT: 0x18, // 030 EMT: emulator trap
TRAP: 0x1C, // 034 TRAP instruction
PIRQ: 0xA0, // 240 PIRQ: program interrupt request
MMU: 0xA8 // 250 MMU: aborts and traps
},
/*
* PDP-11 trap reasons; the reason may also be a non-negative address indicating a BUS memory error
* (unaligned address or non-existent memory). Any reason >= RED (which includes BUS memory errors) generate
* 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)
},
REASONS: [
"UNKNOWN",
"ABORT",
"ILLEGAL",
"RED",
"YELLOW",
"FAULT",
"TRACE",
"HALT",
"OPCODE",
"INTERRUPT"
],
/*
* Assorted common opcodes
*/
@ -202,7 +245,7 @@ var PDP11 = {
INTQ_MASK: 0x03,
WAIT: 0x04, // WAIT operation in progress
TRAP: 0x08, // set if last operation was a trap (see trapLast for the vector, and trapReason for the reason)
TRAP_TF: 0x10, // aka PDP11.PSW.TF
TRAP_TF: 0x10, // aka PDP11.PSW.TF (WARNING: do not change this bit, or you will likely break opRTI())
TRAP_SP: 0x20, // set for a deferred BUS trap (due to a "yellow" stack overflow condition)
TRAP_MMU: 0x40,
TRAP_MASK: 0x70,
@ -246,48 +289,6 @@ var PDP11 = {
SP: 6,
PC: 7,
},
/*
* PDP-11 trap vectors
*/
TRAP: {
UNDEFINED: 0x00, // 000 (reserved)
BUS: 0x04, // 004 unaligned address, non-existent memory, illegal instruction, etc
RESERVED: 0x08, // 010 reserved instructions
BPT: 0x0C, // 014 BPT: breakpoint trap (trace)
IOT: 0x10, // 020 IOT: input/output trap
PF: 0x14, // 024 power fail
EMT: 0x18, // 030 EMT: emulator trap
TRAP: 0x1C, // 034 TRAP instruction
PIRQ: 0xA0, // 240 PIRQ: program interrupt request
MMU: 0xA8 // 250 MMU: aborts and traps
},
/*
* PDP-11 trap reasons; the reason may also be a non-negative address indicating a BUS memory error
* (unaligned address or non-existent memory). Any reason >= RED (which includes BUS memory errors) generate
* immediate (thrown) traps; 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)
},
REASONS: [
"ABORT",
"ILLEGAL",
"RED",
"YELLOW",
"FAULT",
"TRACE",
"HALT",
"OPCODE",
"INTERRUPT"
],
/*
* Internal memory access flags
*/