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New skeleton for x86fpu.js

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This commit is contained in:
Jeff Parsons 2015-11-13 18:20:20 -08:00
commit 2b1b62d565
7 changed files with 1440 additions and 167 deletions
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17
modules/pcjs/lib/x86.js
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@ -532,10 +532,13 @@ var X86 = {
OM: 0x0008, // bit 3: Overflow Mask
UM: 0x0010, // bit 4: Underflow Mask
PM: 0x0020, // bit 5: Precision Mask
// bit 6: unused
IEM: 0x0080, // bit 7: Interrupt Enable Mask (0 enables interrupts, 1 masks them; 8087 only)
PC: 0x0300, // bits 8-9: Precision Control
RC: 0x0C00, // bits 10-11: Rounding Control
IC: 0x1000 // bit 12: Infinity Control (0 for Projective, 1 for Affine)
IC: 0x1000, // bit 12: Infinity Control (0 for Projective, 1 for Affine)
// bits 13-15: unused
INIT: 0x03BF // X86.FPU.CONTROL.IM | X86.FPU.CONTROL.DM | X86.FPU.CONTROL.ZM | X86.FPU.CONTROL.OM | X86.FPU.CONTROL.UM | X86.FPU.CONTROL.PM | X86.FPU.CONTROL.IEM | X86.FPU.CONTROL.PC
},
STATUS: { // FPU Status Word
IE: 0x0001, // bit 0: Invalid Operation
@ -545,6 +548,7 @@ var X86 = {
UE: 0x0010, // bit 4: Underflow
PE: 0x0020, // bit 5: Precision
SF: 0x0040, // bit 6: Stack Fault (80387 and later)
EXC: 0x007F, // all of the above exceptions
ES: 0x0080, // bit 7: Exception Summary (Interrupt Request on 8087)
C0: 0x0100, // bit 8: Condition Code 0
C1: 0x0200, // bit 9: Condition Code 1
@ -553,11 +557,12 @@ var X86 = {
C3: 0x4000, // bit 14: Condition Code 3
BUSY: 0x8000 // bit 15: Busy
},
TAG: {
VALID: 0x0,
ZERO: 0x1,
SPECIAL: 0x2,
EMPTY: 0x3
TAGS: {
VALID: 0x0,
ZERO: 0x1,
SPECIAL:0x2,
EMPTY: 0x3,
MASK: 0x3
}
/*
C3 C2 C1 C0 Condition Code (CC) values following an Examine