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document stack pointer usage

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This commit is contained in:
Dan Luu 2013-03-17 13:41:00 -04:00
parent c6a5989cf7
commit c7f1fbc25d
1 changed files with 87 additions and 87 deletions
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174
cpux86-ta.js
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@ -4237,7 +4237,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
function op_CALLF_paged_mode(is_32_bit, selector, Le, oe) { function op_CALLF_paged_mode(is_32_bit, selector, 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, descriptor_type, re, SS_mask; var ke, we, xe, esp, descriptor_type, re, SS_mask;
var x, limit, Ue; var x, limit, Ue;
var qe, Ve, We; var qe, Ve, We;
if ((selector & 0xfffc) == 0) if ((selector & 0xfffc) == 0)
@ -4266,36 +4266,36 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
if (!(descriptor_high4bytes & (1 << 15))) if (!(descriptor_high4bytes & (1 << 15)))
abort_with_error_code(11, selector & 0xfffc); abort_with_error_code(11, selector & 0xfffc);
{ {
Te = We; esp = We;
SS_mask = SS_mask_from_flags(cpu.segs[2].flags); SS_mask = SS_mask_from_flags(cpu.segs[2].flags);
qe = cpu.segs[2].base; qe = cpu.segs[2].base;
if (is_32_bit) { if (is_32_bit) {
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(cpu.segs[1].selector); st32_mem8_kernel_write(cpu.segs[1].selector);
} }
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(oe); st32_mem8_kernel_write(oe);
} }
} else { } else {
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(cpu.segs[1].selector); st16_mem8_kernel_write(cpu.segs[1].selector);
} }
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(oe); st16_mem8_kernel_write(oe);
} }
} }
limit = calculate_descriptor_limit(descriptor_low4bytes, descriptor_high4bytes); limit = calculate_descriptor_limit(descriptor_low4bytes, descriptor_high4bytes);
if (Le > limit) if (Le > limit)
abort_with_error_code(13, selector & 0xfffc); abort_with_error_code(13, selector & 0xfffc);
regs[4] = (regs[4] & ~SS_mask) | ((Te) & SS_mask); regs[4] = (regs[4] & ~SS_mask) | ((esp) & SS_mask);
set_segment_vars(1, (selector & 0xfffc) | cpl_var, calculate_descriptor_base(descriptor_low4bytes, descriptor_high4bytes), limit, descriptor_high4bytes); set_segment_vars(1, (selector & 0xfffc) | cpl_var, calculate_descriptor_base(descriptor_low4bytes, descriptor_high4bytes), limit, descriptor_high4bytes);
eip = Le, physmem8_ptr = initial_mem_ptr = 0; eip = Le, physmem8_ptr = initial_mem_ptr = 0;
} }
@ -4341,7 +4341,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
if (!(descriptor_high4bytes & (1 << 10)) && dpl < cpl_var) { if (!(descriptor_high4bytes & (1 << 10)) && dpl < cpl_var) {
e = load_from_TR(dpl); e = load_from_TR(dpl);
ke = e[0]; ke = e[0];
Te = e[1]; esp = e[1];
if ((ke & 0xfffc) == 0) if ((ke & 0xfffc) == 0)
abort_with_error_code(10, ke & 0xfffc); abort_with_error_code(10, ke & 0xfffc);
if ((ke & 3) != dpl) if ((ke & 3) != dpl)
@ -4364,70 +4364,70 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
qe = calculate_descriptor_base(we, xe); qe = calculate_descriptor_base(we, xe);
if (is_32_bit) { if (is_32_bit) {
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(cpu.segs[2].selector); st32_mem8_kernel_write(cpu.segs[2].selector);
} }
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(We); st32_mem8_kernel_write(We);
} }
for (i = Se - 1; i >= 0; i--) { for (i = Se - 1; i >= 0; i--) {
x = Xe(Ve + ((We + i * 4) & Ue)); x = Xe(Ve + ((We + i * 4) & Ue));
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(x); st32_mem8_kernel_write(x);
} }
} }
} else { } else {
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(cpu.segs[2].selector); st16_mem8_kernel_write(cpu.segs[2].selector);
} }
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(We); st16_mem8_kernel_write(We);
} }
for (i = Se - 1; i >= 0; i--) { for (i = Se - 1; i >= 0; i--) {
x = Ye(Ve + ((We + i * 2) & Ue)); x = Ye(Ve + ((We + i * 2) & Ue));
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(x); st16_mem8_kernel_write(x);
} }
} }
} }
ue = 1; ue = 1;
} else { } else {
Te = We; esp = We;
SS_mask = SS_mask_from_flags(cpu.segs[2].flags); SS_mask = SS_mask_from_flags(cpu.segs[2].flags);
qe = cpu.segs[2].base; qe = cpu.segs[2].base;
ue = 0; ue = 0;
} }
if (is_32_bit) { if (is_32_bit) {
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(cpu.segs[1].selector); st32_mem8_kernel_write(cpu.segs[1].selector);
} }
{ {
Te = (Te - 4) & -1; esp = (esp - 4) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st32_mem8_kernel_write(oe); st32_mem8_kernel_write(oe);
} }
} else { } else {
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(cpu.segs[1].selector); st16_mem8_kernel_write(cpu.segs[1].selector);
} }
{ {
Te = (Te - 2) & -1; esp = (esp - 2) & -1;
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
st16_mem8_kernel_write(oe); st16_mem8_kernel_write(oe);
} }
} }
@ -4438,7 +4438,7 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
selector = (selector & ~3) | dpl; selector = (selector & ~3) | dpl;
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);
regs[4] = (regs[4] & ~SS_mask) | ((Te) & SS_mask); regs[4] = (regs[4] & ~SS_mask) | ((esp) & SS_mask);
eip = ve, physmem8_ptr = initial_mem_ptr = 0; eip = ve, physmem8_ptr = initial_mem_ptr = 0;
} }
} }
@ -4450,45 +4450,45 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
} }
} }
function do_return_not_paged_mode(is_32_bit, is_iret, imm16) { function do_return_not_paged_mode(is_32_bit, is_iret, imm16) {
var Te, selector, stack_eip, stack_eflags, SS_mask, qe, ef; var esp, selector, stack_eip, stack_eflags, SS_mask, qe, ef;
SS_mask = 0xffff; SS_mask = 0xffff;
Te = regs[4]; esp = regs[4];
qe = cpu.segs[2].base; qe = cpu.segs[2].base;
if (is_32_bit == 1) { if (is_32_bit == 1) {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eip = ld32_mem8_kernel_read(); stack_eip = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
selector = ld32_mem8_kernel_read(); selector = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
selector &= 0xffff; selector &= 0xffff;
if (is_iret) { if (is_iret) {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eflags = ld32_mem8_kernel_read(); stack_eflags = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
} else { } else {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eip = ld16_mem8_kernel_read(); stack_eip = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
selector = ld16_mem8_kernel_read(); selector = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
if (is_iret) { if (is_iret) {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eflags = ld16_mem8_kernel_read(); stack_eflags = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
} }
regs[4] = (regs[4] & ~SS_mask) | ((Te + imm16) & SS_mask); regs[4] = (regs[4] & ~SS_mask) | ((esp + imm16) & SS_mask);
cpu.segs[1].selector = selector; cpu.segs[1].selector = selector;
cpu.segs[1].base = (selector << 4); cpu.segs[1].base = (selector << 4);
eip = stack_eip, physmem8_ptr = initial_mem_ptr = 0; eip = stack_eip, physmem8_ptr = initial_mem_ptr = 0;
@ -4508,59 +4508,59 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
var hf, jf, kf, lf; var hf, jf, kf, lf;
var e, descriptor_low4bytes, descriptor_high4bytes, we, xe; var e, descriptor_low4bytes, descriptor_high4bytes, we, xe;
var cpl_var, dpl, rpl, ef, iopl; var cpl_var, dpl, rpl, ef, iopl;
var qe, Te, stack_eip, wd, SS_mask; var qe, esp, stack_eip, wd, SS_mask;
SS_mask = SS_mask_from_flags(cpu.segs[2].flags); SS_mask = SS_mask_from_flags(cpu.segs[2].flags);
Te = regs[4]; esp = regs[4];
qe = cpu.segs[2].base; qe = cpu.segs[2].base;
stack_eflags = 0; stack_eflags = 0;
if (is_32_bit == 1) { if (is_32_bit == 1) {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eip = ld32_mem8_kernel_read(); stack_eip = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
selector = ld32_mem8_kernel_read(); selector = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
selector &= 0xffff; selector &= 0xffff;
if (is_iret) { if (is_iret) {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eflags = ld32_mem8_kernel_read(); stack_eflags = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
if (stack_eflags & 0x00020000) { if (stack_eflags & 0x00020000) {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
wd = ld32_mem8_kernel_read(); wd = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
gf = ld32_mem8_kernel_read(); gf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
hf = ld32_mem8_kernel_read(); hf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
jf = ld32_mem8_kernel_read(); jf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
kf = ld32_mem8_kernel_read(); kf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
lf = ld32_mem8_kernel_read(); lf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
set_FLAGS(stack_eflags, 0x00000100 | 0x00040000 | 0x00200000 | 0x00000200 | 0x00003000 | 0x00020000 | 0x00004000 | 0x00080000 | 0x00100000); set_FLAGS(stack_eflags, 0x00000100 | 0x00040000 | 0x00200000 | 0x00000200 | 0x00003000 | 0x00020000 | 0x00004000 | 0x00080000 | 0x00100000);
init_segment_vars_with_selector(1, selector & 0xffff); init_segment_vars_with_selector(1, selector & 0xffff);
@ -4577,19 +4577,19 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
} }
} else { } else {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eip= ld16_mem8_kernel_read(); stack_eip= ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
selector = ld16_mem8_kernel_read(); selector = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
if (is_iret) { if (is_iret) {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
stack_eflags = ld16_mem8_kernel_read(); stack_eflags = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
} }
if ((selector & 0xfffc) == 0) if ((selector & 0xfffc) == 0)
@ -4615,32 +4615,32 @@ CPU_X86.prototype.exec_internal = function(N_cycles, interrupt) {
} }
if (!(descriptor_high4bytes & (1 << 15))) if (!(descriptor_high4bytes & (1 << 15)))
abort_with_error_code(11, selector & 0xfffc); abort_with_error_code(11, selector & 0xfffc);
Te = (Te + imm16) & -1; esp = (esp + imm16) & -1;
if (rpl == cpl_var) { if (rpl == cpl_var) {
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);
} else { } else {
if (is_32_bit == 1) { if (is_32_bit == 1) {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
wd = ld32_mem8_kernel_read(); wd = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
gf = ld32_mem8_kernel_read(); gf = ld32_mem8_kernel_read();
Te = (Te + 4) & -1; esp = (esp + 4) & -1;
} }
gf &= 0xffff; gf &= 0xffff;
} else { } else {
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
wd = ld16_mem8_kernel_read(); wd = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
{ {
mem8_loc = (qe + (Te & SS_mask)) & -1; mem8_loc = (qe + (esp & SS_mask)) & -1;
gf = ld16_mem8_kernel_read(); gf = ld16_mem8_kernel_read();
Te = (Te + 2) & -1; esp = (esp + 2) & -1;
} }
} }
if ((gf & 0xfffc) == 0) { if ((gf & 0xfffc) == 0) {
@ -4664,15 +4664,15 @@ 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(rpl); change_permission_level(rpl);
Te = wd; esp = wd;
SS_mask = SS_mask_from_flags(xe); SS_mask = SS_mask_from_flags(xe);
Pe(0, rpl); Pe(0, rpl);
Pe(3, rpl); Pe(3, rpl);
Pe(4, rpl); Pe(4, rpl);
Pe(5, rpl); Pe(5, rpl);
Te = (Te + imm16) & -1; esp = (esp + imm16) & -1;
} }
regs[4] = (regs[4] & ~SS_mask) | ((Te) & SS_mask); regs[4] = (regs[4] & ~SS_mask) | ((esp) & SS_mask);
eip = stack_eip, physmem8_ptr = initial_mem_ptr = 0; eip = stack_eip, physmem8_ptr = initial_mem_ptr = 0;
if (is_iret) { if (is_iret) {
ef = 0x00000100 | 0x00040000 | 0x00200000 | 0x00010000 | 0x00004000; ef = 0x00000100 | 0x00040000 | 0x00200000 | 0x00010000 | 0x00004000;