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Fixed divide-by-zero and data breakpoint exception dispatching

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This commit is contained in:
Jeff Parsons 2015-10-18 10:57:51 -07:00
commit d1d733e38b
8 changed files with 144 additions and 105 deletions
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34
modules/pcjs/lib/x86.js
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@ -65,7 +65,7 @@ var X86 = {
* Of the following exceptions, all are designed to be restartable, except for 0x08 and 0x09 (and 0x0D
* after an attempt to write to a read-only segment).
*
* Error codes are pushed onto the stack for 0x08 (always 0) and 0x0A through 0x0D.
* Error codes are pushed onto the stack for 0x08 (always 0) and 0x0A through 0x0E.
*
* Priority: Instruction exception, TRAP, NMI, Processor Extension Segment Overrun, and finally INTR.
*
@ -84,22 +84,22 @@ var X86 = {
* The term "undocumented" should be limited to operations that are valid but Intel simply never documented.
*/
EXCEPTION: {
DIV_ERR: 0x00, // Divide Error Interrupt
DEBUG: 0x01, // Debug (aka Single Step Trap) Interrupt
DE_EXC: 0x00, // Divide Error Exception (#DE: fault, no error code)
DB_EXC: 0x01, // Debug (aka Single Step Trap) Exception (#DB: fault or trap)
NMI: 0x02, // Non-Maskable Interrupt
BREAKPOINT: 0x03, // Breakpoint Interrupt
OVERFLOW: 0x04, // INTO Overflow Interrupt (FYI, return address does NOT point to offending instruction)
BOUND_ERR: 0x05, // BOUND Error Interrupt
UD_FAULT: 0x06, // Invalid (aka Undefined or Illegal) Opcode (see implementation detail above)
NM_FAULT: 0x07, // No Math Unit Available (see ESC or WAIT)
DF_FAULT: 0x08, // Double Fault (see LIDT)
MP_FAULT: 0x09, // Math Unit Protection Fault (see ESC)
TS_FAULT: 0x0A, // Invalid Task State Segment Fault (protected-mode only)
NP_FAULT: 0x0B, // Not Present Fault (protected-mode only)
SS_FAULT: 0x0C, // Stack Fault (protected-mode only)
GP_FAULT: 0x0D, // General Protection Fault
PG_FAULT: 0x0E, // Page Fault
MF_FAULT: 0x10 // Math Fault (see ESC or WAIT)
BP_TRAP: 0x03, // Breakpoint Exception (#BP: trap)
OF_TRAP: 0x04, // INTO Overflow Exception (#OF: trap)
BR_FAULT: 0x05, // BOUND Error Exception (#BR: fault, no error code)
UD_FAULT: 0x06, // Invalid (aka Undefined/Illegal) Opcode (#UD: fault, no error code)
NM_FAULT: 0x07, // No Math Unit Available; see ESC or WAIT (#NM: fault, no error code)
DF_FAULT: 0x08, // Double Fault; see LIDT (#DF: fault, with error code)
MP_FAULT: 0x09, // Math Unit Protection Fault; see ESC (#MP: fault, no error code)
TS_FAULT: 0x0A, // Invalid Task State Segment Fault (#TS: fault, with error code; protected-mode only)
NP_FAULT: 0x0B, // Not Present Fault (#NP: fault, with error code; protected-mode only)
SS_FAULT: 0x0C, // Stack Fault (#SS: fault, with error code; protected-mode only)
GP_FAULT: 0x0D, // General Protection Fault (#GP: fault, with error code)
PF_FAULT: 0x0E, // Page Fault (#PF: fault, with error code)
MF_FAULT: 0x10 // Math Fault; see ESC or WAIT (#MF: fault, no error code)
},
/*
* Processor Status flag definitions (stored in regPS)
@ -421,7 +421,7 @@ var X86 = {
DATASIZE: 0x0400, // data size override
ADDRSIZE: 0x0800, // address size override
FAULT: 0x1000, // a fault occurred during the current instruction
DEBUG: 0x2000 // a DEBUG exception occurred during the current instruction
DBEXC: 0x2000 // a DB_EXC exception occurred during the current instruction
},
/*
* Bit values for intFlags