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document set_segment_register and related function

This commit is contained in:
Dan Luu 2013-03-16 14:32:13 -04:00
parent a458415457
commit b5a066ba30
1 changed files with 24 additions and 24 deletions
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48
cpux86-ta.js
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@ -4077,11 +4077,11 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
}
cpu.tr.selector = selector;
}
function Fe(register, selector) {
var descriptor_low4bytes, descriptor_high4bytes, cpl_var, he, He, descriptor_table, Rb;
function set_protected_mode_segment_register(register, selector) {
var descriptor_low4bytes, descriptor_high4bytes, cpl_var, dpl, rpl, descriptor_table, selector_index;
cpl_var = cpu.cpl;
if ((selector & 0xfffc) == 0) {
if (register == 2)
if ((selector & 0xfffc) == 0) { //null selector
if (register == 2) //(SS == null) => #GP(0)
abort_with_error_code(13, 0);
set_segment_vars(register, selector, 0, 0, 0);
} else {
@ -4089,27 +4089,27 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
descriptor_table = cpu.ldt;
else
descriptor_table = cpu.gdt;
Rb = selector & ~7;
if ((Rb + 7) > descriptor_table.limit)
selector_index = selector & ~7;
if ((selector_index + 7) > descriptor_table.limit)
abort_with_error_code(13, selector & 0xfffc);
mem8_loc = (descriptor_table.base + Rb) & -1;
mem8_loc = (descriptor_table.base + selector_index) & -1;
descriptor_low4bytes = ld32_mem8_kernel_read();
mem8_loc += 4;
descriptor_high4bytes = ld32_mem8_kernel_read();
if (!(descriptor_high4bytes & (1 << 12)))
abort_with_error_code(13, selector & 0xfffc);
He = selector & 3;
he = (descriptor_high4bytes >> 13) & 3;
rpl = selector & 3;
dpl = (descriptor_high4bytes >> 13) & 3;
if (register == 2) {
if ((descriptor_high4bytes & (1 << 11)) || !(descriptor_high4bytes & (1 << 9)))
abort_with_error_code(13, selector & 0xfffc);
if (He != cpl_var || he != cpl_var)
if (rpl != cpl_var || dpl != cpl_var)
abort_with_error_code(13, selector & 0xfffc);
} else {
if ((descriptor_high4bytes & ((1 << 11) | (1 << 9))) == (1 << 11))
abort_with_error_code(13, selector & 0xfffc);
if (!(descriptor_high4bytes & (1 << 11)) || !(descriptor_high4bytes & (1 << 10))) {
if (he < cpl_var || he < He)
if (dpl < cpl_var || dpl < rpl)
abort_with_error_code(13, selector & 0xfffc);
}
}
@ -4126,18 +4126,18 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
set_segment_vars(register, selector, calculate_descriptor_base(descriptor_low4bytes, descriptor_high4bytes), calculate_descriptor_limit(descriptor_low4bytes, descriptor_high4bytes), descriptor_high4bytes);
}
}
function Ie(register, selector) {
function set_segment_register(register, selector) {
var descriptor_table;
selector &= 0xffff;
if (!(cpu.cr0 & (1 << 0))) {
if (!(cpu.cr0 & (1 << 0))) { //CR0.PE (0 == real mode)
descriptor_table = cpu.segs[register];
descriptor_table.selector = selector;
descriptor_table.base = selector << 4;
} else if (cpu.eflags & 0x00020000) {
} else if (cpu.eflags & 0x00020000) { //EFLAGS.VM (1 == v86 mode)
init_segment_vars_with_selector(register, selector);
} else {
Fe(register, selector);
}
} else { //protected mode
set_protected_mode_segment_register(register, selector);
}
}
function do_JMPF_virtual_mode(Ke, Le) {
eip = Le, physmem8_ptr = initial_mem_ptr = 0;
@ -5156,7 +5156,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
x = ld_32bits_mem8_read();
mem8_loc += 4;
y = ld_16bits_mem8_read();
Ie(Sb, y);
set_segment_register(Sb, y);
regs[(mem8 >> 3) & 7] = x;
}
function op_16_load_far_pointer16(Sb) {
@ -5168,7 +5168,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
x = ld_16bits_mem8_read();
mem8_loc += 2;
y = ld_16bits_mem8_read();
Ie(Sb, y);
set_segment_register(Sb, y);
set_lower_word_in_register((mem8 >> 3) & 7, x);
}
function stringOp_INSB() {
@ -6238,7 +6238,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
mem8_loc = segment_translation(mem8);
x = ld_16bits_mem8_read();
}
Ie(reg_idx1, x);
set_segment_register(reg_idx1, x);
break EXEC_LOOP;
case 0x8c://MOV Sw Mw Move
mem8 = phys_mem8[physmem8_ptr++];
@ -7084,7 +7084,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
case 0x07://POP SS:[rSP] ES Pop a Value from the Stack
case 0x17://POP SS:[rSP] SS Pop a Value from the Stack
case 0x1f://POP SS:[rSP] DS Pop a Value from the Stack
Ie(OPbyte >> 3, pop_dword_from_stack_read() & 0xffff);
set_segment_register(OPbyte >> 3, pop_dword_from_stack_read() & 0xffff);
pop_dword_from_stack_incr_ptr();
break EXEC_LOOP;
case 0x8d://LEA M Gvqp Load Effective Address
@ -8291,7 +8291,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
break EXEC_LOOP;
case 0xa1://POP SS:[rSP] FS Pop a Value from the Stack
case 0xa9://POP SS:[rSP] GS Pop a Value from the Stack
Ie((OPbyte >> 3) & 7, pop_dword_from_stack_read() & 0xffff);
set_segment_register((OPbyte >> 3) & 7, pop_dword_from_stack_read() & 0xffff);
pop_dword_from_stack_incr_ptr();
break EXEC_LOOP;
case 0xc8://BSWAP Zvqp Byte Swap
@ -8929,7 +8929,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
case 0x107://POP SS:[rSP] ES Pop a Value from the Stack
case 0x117://POP SS:[rSP] SS Pop a Value from the Stack
case 0x11f://POP SS:[rSP] DS Pop a Value from the Stack
Ie((OPbyte >> 3) & 3, pop_word_from_stack_read());
set_segment_register((OPbyte >> 3) & 3, pop_word_from_stack_read());
pop_word_from_stack_incr_ptr();
break EXEC_LOOP;
case 0x18d://LEA M Gvqp Load Effective Address
@ -9361,7 +9361,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
break EXEC_LOOP;
case 0x1a1://POP SS:[rSP] FS Pop a Value from the Stack
case 0x1a9://POP SS:[rSP] GS Pop a Value from the Stack
Ie((OPbyte >> 3) & 7, pop_word_from_stack_read());
set_segment_register((OPbyte >> 3) & 7, pop_word_from_stack_read());
pop_word_from_stack_incr_ptr();
break EXEC_LOOP;
case 0x1b2://LSS Mptp SS Load Far Pointer