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Document TR/descriptor type references

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This commit is contained in:
Dan Luu 2013-03-18 10:58:14 -04:00
parent a348bf5ffd
commit a981e71f0f
1 changed files with 20 additions and 20 deletions
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40
cpux86-ta.js
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@ -3694,13 +3694,13 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
/* used only in CALLF, and InterruptF in paged mode */ /* used only in CALLF, and InterruptF in paged mode */
function load_from_TR(he) { function load_from_TR(he) {
var ie, Rb, je, ke, le; var tr_type, Rb, je, ke, le;
if (!(cpu.tr.flags & (1 << 15))) if (!(cpu.tr.flags & (1 << 15)))
cpu_abort("invalid tss"); //task state segment cpu_abort("invalid tss"); //task state segment
ie = (cpu.tr.flags >> 8) & 0xf; tr_type = (cpu.tr.flags >> 8) & 0xf;
if ((ie & 7) != 1) if ((tr_type & 7) != 1)
cpu_abort("invalid tss type"); cpu_abort("invalid tss type");
je = ie >> 3; je = tr_type >> 3;
Rb = (he * 4 + 2) << je; Rb = (he * 4 + 2) << je;
if (Rb + (4 << je) - 1 > cpu.tr.limit) if (Rb + (4 << je) - 1 > cpu.tr.limit)
abort_with_error_code(10, cpu.tr.selector & 0xfffc); abort_with_error_code(10, cpu.tr.selector & 0xfffc);
@ -3716,7 +3716,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
return [ke, le]; return [ke, le];
} }
function do_interrupt_paged_mode(intno, ne, error_code, oe, pe) { function do_interrupt_paged_mode(intno, ne, error_code, oe, pe) {
var descriptor_table, qe, ie, he, selector, re, cpl_var; var descriptor_table, qe, descriptor_type, he, selector, re, cpl_var;
var te, ue, je; var te, ue, je;
var e, descriptor_low4bytes, descriptor_high4bytes, ve, ke, le, we, xe; var e, descriptor_low4bytes, descriptor_high4bytes, ve, ke, le, we, xe;
var ye, SS_mask; var ye, SS_mask;
@ -3745,8 +3745,8 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
descriptor_low4bytes = ld32_mem8_kernel_read(); descriptor_low4bytes = ld32_mem8_kernel_read();
mem8_loc += 4; mem8_loc += 4;
descriptor_high4bytes = ld32_mem8_kernel_read(); descriptor_high4bytes = ld32_mem8_kernel_read();
ie = (descriptor_high4bytes >> 8) & 0x1f; descriptor_type = (descriptor_high4bytes >> 8) & 0x1f;
switch (ie) { switch (descriptor_type) {
case 5: case 5:
case 7: case 7:
case 6: case 6:
@ -3818,7 +3818,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
qe = 0; qe = 0;
le = 0; le = 0;
} }
je = ie >> 3; je = descriptor_type >> 3;
if (je == 1) { if (je == 1) {
if (ue) { if (ue) {
if (cpu.eflags & 0x00020000) { if (cpu.eflags & 0x00020000) {
@ -3949,7 +3949,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
set_segment_vars(1, selector, calculate_descriptor_base(descriptor_low4bytes, descriptor_high4bytes), calculate_descriptor_limit(descriptor_low4bytes, descriptor_high4bytes), descriptor_high4bytes); set_segment_vars(1, selector, calculate_descriptor_base(descriptor_low4bytes, descriptor_high4bytes), calculate_descriptor_limit(descriptor_low4bytes, descriptor_high4bytes), descriptor_high4bytes);
change_permission_level(dpl); change_permission_level(dpl);
eip = ve, physmem8_ptr = initial_mem_ptr = 0; eip = ve, physmem8_ptr = initial_mem_ptr = 0;
if ((ie & 1) == 0) { if ((descriptor_type & 1) == 0) {
cpu.eflags &= ~0x00000200; cpu.eflags &= ~0x00000200;
} }
cpu.eflags &= ~(0x00000100 | 0x00020000 | 0x00010000 | 0x00004000); cpu.eflags &= ~(0x00000100 | 0x00020000 | 0x00010000 | 0x00004000);
@ -4048,7 +4048,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
cpu.ldt.selector = selector; cpu.ldt.selector = selector;
} }
function op_LTR(selector) { function op_LTR(selector) {
var descriptor_table, descriptor_low4bytes, descriptor_high4bytes, Rb, ie, De; var descriptor_table, descriptor_low4bytes, descriptor_high4bytes, Rb, descriptor_type, De;
selector &= 0xffff; selector &= 0xffff;
if ((selector & 0xfffc) == 0) { if ((selector & 0xfffc) == 0) {
cpu.tr.base = 0; cpu.tr.base = 0;
@ -4066,8 +4066,8 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
descriptor_low4bytes = ld32_mem8_kernel_read(); descriptor_low4bytes = ld32_mem8_kernel_read();
mem8_loc += 4; mem8_loc += 4;
descriptor_high4bytes = ld32_mem8_kernel_read(); descriptor_high4bytes = ld32_mem8_kernel_read();
ie = (descriptor_high4bytes >> 8) & 0xf; descriptor_type = (descriptor_high4bytes >> 8) & 0xf;
if ((descriptor_high4bytes & (1 << 12)) || (ie != 1 && ie != 9)) if ((descriptor_high4bytes & (1 << 12)) || (descriptor_type != 1 && descriptor_type != 9))
abort_with_error_code(13, selector & 0xfffc); abort_with_error_code(13, selector & 0xfffc);
if (!(descriptor_high4bytes & (1 << 15))) if (!(descriptor_high4bytes & (1 << 15)))
abort_with_error_code(11, selector & 0xfffc); abort_with_error_code(11, selector & 0xfffc);
@ -4237,7 +4237,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
function op_CALLF_paged_mode(je, Ke, Le, oe) { function op_CALLF_paged_mode(je, Ke, Le, oe) {
var ue, i, e; var ue, i, e;
var descriptor_low4bytes, descriptor_high4bytes, cpl_var, dpl, rpl, selector, ve, Se; var descriptor_low4bytes, descriptor_high4bytes, cpl_var, dpl, rpl, selector, ve, Se;
var ke, we, xe, Te, ie, re, SS_mask; var ke, we, xe, Te, descriptor_type, re, SS_mask;
var x, limit, Ue; var x, limit, Ue;
var qe, Ve, We; var qe, Ve, We;
if ((Ke & 0xfffc) == 0) if ((Ke & 0xfffc) == 0)
@ -4300,10 +4300,10 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
eip = Le, physmem8_ptr = initial_mem_ptr = 0; eip = Le, physmem8_ptr = initial_mem_ptr = 0;
} }
} else { } else {
ie = (descriptor_high4bytes >> 8) & 0x1f; descriptor_type = (descriptor_high4bytes >> 8) & 0x1f;
dpl = (descriptor_high4bytes >> 13) & 3; dpl = (descriptor_high4bytes >> 13) & 3;
rpl = Ke & 3; rpl = Ke & 3;
switch (ie) { switch (descriptor_type) {
case 1: case 1:
case 9: case 9:
case 5: case 5:
@ -4316,7 +4316,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
abort_with_error_code(13, Ke & 0xfffc); abort_with_error_code(13, Ke & 0xfffc);
break; break;
} }
je = ie >> 3; je = descriptor_type >> 3;
if (dpl < cpl_var || dpl < rpl) if (dpl < cpl_var || dpl < rpl)
abort_with_error_code(13, Ke & 0xfffc); abort_with_error_code(13, Ke & 0xfffc);
if (!(descriptor_high4bytes & (1 << 15))) if (!(descriptor_high4bytes & (1 << 15)))
@ -4712,8 +4712,8 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
} }
//utility function for op_LAR_LSL //utility function for op_LAR_LSL
function of(selector, pf) { function of(selector, is_lsl) {
var e, descriptor_low4bytes, descriptor_high4bytes, rpl, he, cpl_var, ie; var e, descriptor_low4bytes, descriptor_high4bytes, rpl, dpl, cpl_var, descriptor_type;
if ((selector & 0xfffc) == 0) if ((selector & 0xfffc) == 0)
return null; return null;
e = load_from_descriptor_table(selector); e = load_from_descriptor_table(selector);
@ -4731,8 +4731,8 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
return null; return null;
} }
} else { } else {
ie = (descriptor_high4bytes >> 8) & 0xf; descriptor_type = (descriptor_high4bytes >> 8) & 0xf;
switch (ie) { switch (descriptor_type) {
case 1: case 1:
case 2: case 2:
case 3: case 3: