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tss_emu.c
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206 lines (143 loc) · 3.7 KB
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#include "tss_emu.h"
#include "tss.h"
#include "gdebug.h"
#include "system.h"
#include "ctrl_reg_emu.h"
#include "cpuseg_emu.h"
#include "stack.h"
#include "memory.h"
static void itr_emu_high_0xD(vm_emu_datas *status, BYTE low_code);
static void itr_emu_high_0x1(vm_emu_datas *status, BYTE low_code);
static void itr_emu_high_0x5(vm_emu_datas *status, BYTE low_code);
static void write_tr_reg(WORD selector);
static WORD v_tr = 0x0;
static DWORD (*gen_reg_func[])(vm_emu_datas*) = {
&ret_eax,
&ret_ecx,
&ret_edx,
&ret_ebx,
&ret_esi,
&ret_ebp,
&ret_esi,
&ret_edi
};
void cpu_emu_ltr(BYTE modr_m, vm_emu_datas *status){
switch((modr_m >> 4) & 0xf){
case 0xD:
itr_emu_high_0xD(status, modr_m & 0xf);
break;
case 0x1:
itr_emu_high_0x1(status, modr_m & 0xf);
break;
case 0x5:
itr_emu_high_0x5(status, modr_m & 0xf);
break;
}
}
void cpu_emu_clts(vm_emu_datas *status){
vm_clear_flag_crn(0, 3);
cpu_emu_do_clts();
}
void cpu_emu_do_clts(){
asm volatile ("clts");
}
void cpu_emu_get_esp_ss_from_tss(int level, WORD *ss, DWORD *esp){
segment_entry tss_entry;
TSS _guest_tss;
void *tss_addr;
tss_entry = cpu_emu_get_guest_seg_value(v_tr);
tss_addr = (void*)((tss_entry.baseH << 24) | (tss_entry.baseM << 16) | tss_entry.baseL);
_sys_physic_mem_read(&_guest_tss, tss_addr, sizeof(TSS));
switch(level){
case 0:
*ss = _guest_tss.ss0;
*esp = _guest_tss.esp0;
break;
case 1:
*ss = _guest_tss.ss1;
*esp = _guest_tss.esp1;
break;
case 2:
*ss = _guest_tss.ss2;
*esp = _guest_tss.esp2;
break;
}
}
static void itr_emu_high_0x5(vm_emu_datas *status, BYTE low_code){
DWORD value;
if(status->opcode_prefix){
value = get_user_dword_value(status->regs->ds, status->regs->ebp & 0xffff);
}else{
value = get_user_dword_value(status->regs->ds, status->regs->ebp);
}
/* ‹ó“Ç‚Ý */
get_userseg_byte(status->code_addr);
write_tr_reg((WORD)value);
}
static void itr_emu_high_0xD(vm_emu_datas *status, BYTE low_code){
write_tr_reg(gen_reg_func[low_code - 0x8](status));
}
static void itr_emu_high_0x1(vm_emu_datas *status, BYTE low_code){
DWORD value;
if(get_vm_mode_status()){
if(status->opcode_prefix){
switch(low_code){
case 0xC:
value = status->regs->esi & 0xffff;
break;
case 0xD:
value = status->regs->edi & 0xffff;
break;
case 0xF:
value = status->regs->ebx & 0xffff;
break;
}
}else{
switch(low_code){
case 0xC:
get_userseg_byte(status->code_addr);
value = status->stack.sys_stack->esp;
break;
case 0xD:
value = get_userseg_dword(status->code_addr);
break;
default:
value = gen_reg_func[low_code - 0x8](status);
break;
}
}
}else{
if(status->opcode_prefix){
switch(low_code){
case 0xC:
get_userseg_byte(status->code_addr);
value = status->stack.sys_stack->esp;
break;
default:
value = gen_reg_func[low_code - 0x8](status);
break;
}
}else{
switch(low_code){
case 0xC:
value = status->regs->esi & 0xffff;
break;
case 0xD:
value = status->regs->edi & 0xffff;
break;
case 0xE:
value = get_userseg_word(status->code_addr);
break;
case 0xF:
value = status->regs->ebx & 0xffff;
break;
}
}
}
value = get_user_word_value(status->regs->ds, value);
write_tr_reg(value);
}
static void write_tr_reg(WORD selector){
//_sys_printf("tr load: %x\n", selector);
v_tr = selector;
}