/*---
* CALLfar_pm: call gate (SAME-PRIVILEGE)
*/
static void
CALLfar_pm_call_gate_same_privilege(const selector_t *callgate_sel, selector_t *cs_sel)
{
UINT32 sp;
VERBOSE(("CALLfar_pm: SAME-PRIVILEGE"));
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
if (callgate_sel->desc.type == CPU_SYSDESC_TYPE_CALL_32) {
STACK_PUSH_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 8);
PUSH0_32(CPU_CS);
PUSH0_32(CPU_EIP);
load_cs(cs_sel->selector, &cs_sel->desc, CPU_STAT_CPL);
SET_EIP(callgate_sel->desc.u.gate.offset);
} else {
STACK_PUSH_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 4);
PUSH0_16(CPU_CS);
PUSH0_16(CPU_IP);
load_cs(cs_sel->selector, &cs_sel->desc, CPU_STAT_CPL);
SET_EIP(callgate_sel->desc.u.gate.offset);
}
}
void
CALL16_Ap(void)
{
descriptor_t sd;
UINT16 new_ip;
UINT16 new_cs;
UINT16 sreg;
CPU_WORKCLOCK(13);
GET_PCWORD(new_ip);
GET_PCWORD(new_cs);
if (!CPU_STAT_PM || CPU_STAT_VM86) {
/* Real mode or VM86 mode */
CPU_SET_PREV_ESP();
load_segreg(CPU_CS_INDEX, new_cs, &sreg, &sd, GP_EXCEPTION);
if (new_ip > sd.u.seg.limit) {
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_16(CPU_CS);
PUSH0_16(CPU_IP);
LOAD_SEGREG(CPU_CS_INDEX, new_cs);
CPU_EIP = new_ip;
CPU_CLEAR_PREV_ESP();
} else {
/* Protected mode */
CALLfar_pm(new_cs, new_ip);
}
}
static void CPUCALL
interrupt_task_gate(const descriptor_t *gsdp, int intrtype, int errorp, int error_code)
{
selector_t task_sel;
int rv;
VERBOSE(("interrupt: TASK-GATE"));
rv = parse_selector(&task_sel, gsdp->u.gate.selector);
if (rv < 0 || task_sel.ldt || !SEG_IS_SYSTEM(&task_sel.desc)) {
VERBOSE(("interrupt: parse_selector (selector = %04x, rv = %d, %cDT, type = %s)", gsdp->u.gate.selector, rv, task_sel.ldt ? 'L' : 'G', task_sel.desc.s ? "code/data" : "system"));
EXCEPTION(TS_EXCEPTION, task_sel.idx);
}
/* check gate type */
switch (task_sel.desc.type) {
case CPU_SYSDESC_TYPE_TSS_16:
case CPU_SYSDESC_TYPE_TSS_32:
break;
case CPU_SYSDESC_TYPE_TSS_BUSY_16:
case CPU_SYSDESC_TYPE_TSS_BUSY_32:
VERBOSE(("interrupt: task is busy."));
/*FALLTHROUGH*/
default:
VERBOSE(("interrupt: invalid gate type (%d)", task_sel.desc.type));
EXCEPTION(TS_EXCEPTION, task_sel.idx);
break;
}
/* not present */
if (selector_is_not_present(&task_sel)) {
VERBOSE(("interrupt: selector is not present"));
EXCEPTION(NP_EXCEPTION, task_sel.idx);
}
task_switch(&task_sel, TASK_SWITCH_INTR);
CPU_SET_PREV_ESP();
if (errorp) {
VERBOSE(("interrupt: push error code (%08x)", error_code));
if (task_sel.desc.type == CPU_SYSDESC_TYPE_TSS_32) {
PUSH0_32(error_code);
} else {
PUSH0_16(error_code);
}
}
/* out of range */
if (CPU_EIP > CPU_STAT_CS_LIMIT) {
VERBOSE(("interrupt: new_ip is out of range. new_ip = %08x, limit = %08x", CPU_EIP, CPU_STAT_CS_LIMIT));
EXCEPTION(GP_EXCEPTION, 0);
}
}
/*
* PUSHF/POPF
*/
void
PUSHF_Fw(void)
{
CPU_WORKCLOCK(3);
if (!CPU_STAT_PM || !CPU_STAT_VM86 || (CPU_STAT_IOPL == CPU_IOPL3)) {
UINT16 flags = REAL_FLAGREG;
flags = (flags & ALL_FLAG) | 2;
PUSH0_16(flags);
return;
}
/* VM86 && IOPL != 3 */
EXCEPTION(GP_EXCEPTION, 0);
}
void CPUCALL
CALL16_Ep(UINT32 op)
{
descriptor_t sd;
UINT32 madr;
UINT16 new_ip;
UINT16 new_cs;
UINT16 sreg;
CPU_WORKCLOCK(16);
if (op < 0xc0) {
madr = calc_ea_dst(op);
new_ip = cpu_vmemoryread_w(CPU_INST_SEGREG_INDEX, madr);
new_cs = cpu_vmemoryread_w(CPU_INST_SEGREG_INDEX, madr + 2);
if (!CPU_STAT_PM || CPU_STAT_VM86) {
/* Real mode or VM86 mode */
CPU_SET_PREV_ESP();
load_segreg(CPU_CS_INDEX, new_cs, &sreg, &sd, GP_EXCEPTION);
if (new_ip > sd.u.seg.limit) {
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_16(CPU_CS);
PUSH0_16(CPU_IP);
LOAD_SEGREG(CPU_CS_INDEX, new_cs);
CPU_EIP = new_ip;
CPU_CLEAR_PREV_ESP();
} else {
/* Protected mode */
CALLfar_pm(new_cs, new_ip);
}
return;
}
EXCEPTION(UD_EXCEPTION, 0);
}
/*
* CALL
*/
void
CALL_Aw(void)
{
UINT16 new_ip;
SINT16 dest;
CPU_WORKCLOCK(7);
CPU_SET_PREV_ESP();
GET_PCWORDS(dest);
new_ip = CPU_EIP + dest;
if (new_ip > CPU_STAT_CS_LIMIT) {
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_16(CPU_IP);
CPU_EIP = new_ip;
CPU_CLEAR_PREV_ESP();
}
void CPUCALL
CALL_Ew(UINT32 op)
{
UINT32 madr;
UINT16 new_ip;
CPU_SET_PREV_ESP();
if (op >= 0xc0) {
CPU_WORKCLOCK(7);
new_ip = *(reg16_b20[op]);
} else {
CPU_WORKCLOCK(11);
madr = calc_ea_dst(op);
new_ip = cpu_vmemoryread_w(CPU_INST_SEGREG_INDEX, madr);
}
if (new_ip > CPU_STAT_CS_LIMIT) {
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_16(CPU_IP);
CPU_EIP = new_ip;
CPU_CLEAR_PREV_ESP();
}
/*
* STACK
*/
void
ENTER16_IwIb(void)
{
UINT32 sp, bp;
UINT32 val;
UINT16 dimsize;
UINT16 new_bp;
UINT8 level;
GET_PCWORD(dimsize);
GET_PCBYTE(level);
level &= 0x1f;
CPU_SET_PREV_ESP();
PUSH0_16(CPU_BP);
if (level == 0) { /* enter level=0 */
CPU_WORKCLOCK(11);
CPU_BP = CPU_SP;
if (!CPU_STAT_SS32) {
CPU_SP -= dimsize;
} else {
CPU_ESP -= dimsize;
}
} else {
--level;
if (level == 0) { /* enter level=1 */
CPU_WORKCLOCK(15);
sp = CPU_SP;
PUSH0_16(sp);
CPU_BP = (UINT16)sp;
if (!CPU_STAT_SS32) {
CPU_SP -= dimsize;
} else {
CPU_ESP -= dimsize;
}
} else { /* enter level=2-31 */
CPU_WORKCLOCK(12 + level * 4);
if (!CPU_STAT_SS32) {
bp = CPU_BP;
new_bp = CPU_SP;
while (level--) {
bp -= 2;
CPU_SP -= 2;
val = cpu_vmemoryread_w(CPU_SS_INDEX, bp);
cpu_vmemorywrite_w(CPU_SS_INDEX, CPU_SP, (UINT16)val);
}
REGPUSH0(new_bp);
CPU_BP = new_bp;
CPU_SP -= dimsize;
} else {
bp = CPU_EBP;
new_bp = CPU_SP;
while (level--) {
bp -= 2;
CPU_ESP -= 2;
val = cpu_vmemoryread_w(CPU_SS_INDEX, bp);
cpu_vmemorywrite_w(CPU_SS_INDEX, CPU_ESP, (UINT16)val);
}
REGPUSH0_16_32(new_bp);
CPU_BP = new_bp;
CPU_ESP -= dimsize;
}
}
}
CPU_CLEAR_PREV_ESP();
}
/*---
* CALLfar_pm: call gate (MORE-PRIVILEGE)
*/
static void
CALLfar_pm_call_gate_more_privilege(const selector_t *callgate_sel, selector_t *cs_sel)
{
UINT32 param[32]; /* copy param */
selector_t ss_sel;
UINT32 old_eip, old_esp;
UINT32 new_esp;
UINT16 old_cs, old_ss;
UINT16 new_ss;
int param_count;
int i;
int rv;
VERBOSE(("CALLfar_pm: MORE-PRIVILEGE"));
/* save register */
old_cs = CPU_CS;
old_ss = CPU_SS;
old_eip = CPU_EIP;
old_esp = CPU_ESP;
if (!CPU_STAT_SS32) {
old_esp &= 0xffff;
}
/* get stack pointer from TSS */
get_stack_pointer_from_tss(cs_sel->desc.dpl, &new_ss, &new_esp);
/* parse stack segment descriptor */
rv = parse_selector(&ss_sel, new_ss);
if (rv < 0) {
VERBOSE(("CALLfar_pm: parse_selector (selector = %04x, rv = %d)", new_ss, rv));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
/* check privilege level */
if (ss_sel.rpl != cs_sel->desc.dpl) {
VERBOSE(("CALLfar_pm: RPL[SS](%d) != DPL[CS](%d)", ss_sel.rpl, cs_sel->desc.dpl));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
if (ss_sel.desc.dpl != cs_sel->desc.dpl) {
VERBOSE(("CALLfar_pm: DPL[SS](%d) != DPL[CS](%d)", ss_sel.desc.dpl, cs_sel->desc.dpl));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
/* stack segment must be writable data segment. */
if (!ss_sel.desc.s) {
VERBOSE(("CALLfar_pm: stack segment is system segment"));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
if (ss_sel.desc.u.seg.c) {
VERBOSE(("CALLfar_pm: stack segment is code segment"));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
if (!ss_sel.desc.u.seg.wr) {
VERBOSE(("CALLfar_pm: stack segment is read-only data segment"));
EXCEPTION(TS_EXCEPTION, ss_sel.idx);
}
/* not present */
if (selector_is_not_present(&ss_sel)) {
VERBOSE(("CALLfar_pm: stack segment selector is not present"));
EXCEPTION(SS_EXCEPTION, ss_sel.idx);
}
param_count = callgate_sel->desc.u.gate.count;
VERBOSE(("CALLfar_pm: param_count = %d", param_count));
if (callgate_sel->desc.type == CPU_SYSDESC_TYPE_CALL_32) {
STACK_PUSH_CHECK(ss_sel.idx, &ss_sel.desc, new_esp, 16 + param_count * 4);
/* dump param */
for (i = 0; i < param_count; i++) {
param[i] = cpu_vmemoryread_d(CPU_SS_INDEX, old_esp + i * 4);
VERBOSE(("CALLfar_pm: get param[%d] = %08x", i, param[i]));
}
load_ss(ss_sel.selector, &ss_sel.desc, ss_sel.desc.dpl);
if (CPU_STAT_SS32) {
CPU_ESP = new_esp;
} else {
CPU_SP = (UINT16)new_esp;
}
load_cs(cs_sel->selector, &cs_sel->desc, cs_sel->desc.dpl);
SET_EIP(callgate_sel->desc.u.gate.offset);
PUSH0_32(old_ss);
PUSH0_32(old_esp);
/* restore param */
for (i = param_count; i > 0; i--) {
PUSH0_32(param[i - 1]);
VERBOSE(("CALLfar_pm: set param[%d] = %08x", i - 1, param[i - 1]));
}
PUSH0_32(old_cs);
PUSH0_32(old_eip);
} else {
STACK_PUSH_CHECK(ss_sel.idx, &ss_sel.desc, new_esp, 8 + param_count * 2);
/* dump param */
for (i = 0; i < param_count; i++) {
param[i] = cpu_vmemoryread_w(CPU_SS_INDEX, old_esp + i * 2);
VERBOSE(("CALLfar_pm: get param[%d] = %04x", i, param[i]));
}
load_ss(ss_sel.selector, &ss_sel.desc, ss_sel.desc.dpl);
if (CPU_STAT_SS32) {
CPU_ESP = new_esp;
} else {
CPU_SP = (UINT16)new_esp;
}
load_cs(cs_sel->selector, &cs_sel->desc, cs_sel->desc.dpl);
SET_EIP(callgate_sel->desc.u.gate.offset);
PUSH0_16(old_ss);
PUSH0_16(old_esp);
/* restore param */
for (i = param_count; i > 0; i--) {
PUSH0_16(param[i - 1]);
VERBOSE(("CALLfar_pm: set param[%d] = %04x", i - 1, param[i - 1]));
}
PUSH0_16(old_cs);
PUSH0_16(old_eip);
}
}
/*---
* CALLfar_pm: code segment
*/
static void
CALLfar_pm_code_segment(const selector_t *cs_sel, UINT32 new_ip)
{
UINT32 sp;
VERBOSE(("CALLfar_pm: CODE-SEGMENT"));
/* check privilege level */
if (!cs_sel->desc.u.seg.ec) {
VERBOSE(("CALLfar_pm: NON-CONFORMING-CODE-SEGMENT"));
/* 下巻 p.119 4.8.1.1. */
if (cs_sel->rpl > CPU_STAT_CPL) {
VERBOSE(("CALLfar_pm: RPL(%d) > CPL(%d)", cs_sel->rpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, cs_sel->idx);
}
if (cs_sel->desc.dpl != CPU_STAT_CPL) {
VERBOSE(("CALLfar_pm: DPL(%d) != CPL(%d)", cs_sel->desc.dpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, cs_sel->idx);
}
} else {
VERBOSE(("CALLfar_pm: CONFORMING-CODE-SEGMENT"));
/* 下巻 p.120 4.8.1.2. */
if (cs_sel->desc.dpl > CPU_STAT_CPL) {
VERBOSE(("CALLfar_pm: DPL(%d) > CPL(%d)", cs_sel->desc.dpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, cs_sel->idx);
}
}
/* not present */
if (selector_is_not_present(cs_sel)) {
VERBOSE(("CALLfar_pm: selector is not present"));
EXCEPTION(NP_EXCEPTION, cs_sel->idx);
}
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
if (CPU_INST_OP32) {
STACK_PUSH_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 8);
/* out of range */
if (new_ip > cs_sel->desc.u.seg.limit) {
VERBOSE(("CALLfar_pm: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel->desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_32(CPU_CS);
PUSH0_32(CPU_EIP);
} else {
STACK_PUSH_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 4);
/* out of range */
if (new_ip > cs_sel->desc.u.seg.limit) {
VERBOSE(("CALLfar_pm: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel->desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
PUSH0_16(CPU_CS);
PUSH0_16(CPU_IP);
}
load_cs(cs_sel->selector, &cs_sel->desc, CPU_STAT_CPL);
SET_EIP(new_ip);
}
static void CPUCALL
interrupt_intr_or_trap(const descriptor_t *gsdp, int intrtype, int errorp, int error_code)
{
selector_t cs_sel, ss_sel;
UINT stacksize;
UINT32 old_flags;
UINT32 new_flags;
UINT32 mask;
UINT32 sp;
UINT32 new_ip, new_sp;
UINT32 old_ip, old_sp;
UINT16 old_cs, old_ss, new_ss;
BOOL is32bit;
int exc_errcode;
int rv;
new_ip = gsdp->u.gate.offset;
old_ss = CPU_SS;
old_cs = CPU_CS;
old_ip = CPU_EIP;
old_sp = CPU_ESP;
old_flags = REAL_EFLAGREG;
new_flags = REAL_EFLAGREG & ~(T_FLAG|RF_FLAG|NT_FLAG|VM_FLAG);
mask = T_FLAG|RF_FLAG|NT_FLAG|VM_FLAG;
switch (gsdp->type) {
case CPU_SYSDESC_TYPE_INTR_16:
case CPU_SYSDESC_TYPE_INTR_32:
VERBOSE(("interrupt: INTERRUPT-GATE"));
new_flags &= ~I_FLAG;
mask |= I_FLAG;
break;
case CPU_SYSDESC_TYPE_TRAP_16:
case CPU_SYSDESC_TYPE_TRAP_32:
VERBOSE(("interrupt: TRAP-GATE"));
break;
default:
ia32_panic("interrupt: gate descriptor type is invalid (type = %d)", gsdp->type);
break;
}
exc_errcode = gsdp->u.gate.selector & ~3;
if (intrtype == INTR_TYPE_EXTINTR)
exc_errcode++;
rv = parse_selector(&cs_sel, gsdp->u.gate.selector);
if (rv < 0) {
VERBOSE(("interrupt: parse_selector (selector = %04x, rv = %d)", gsdp->u.gate.selector, rv));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
/* check segment type */
if (SEG_IS_SYSTEM(&cs_sel.desc)) {
VERBOSE(("interrupt: code segment is system segment"));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
if (SEG_IS_DATA(&cs_sel.desc)) {
VERBOSE(("interrupt: code segment is data segment"));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
/* check privilege level */
if (cs_sel.desc.dpl > CPU_STAT_CPL) {
VERBOSE(("interrupt: DPL(%d) > CPL(%d)", cs_sel.desc.dpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
/* not present */
if (selector_is_not_present(&cs_sel)) {
VERBOSE(("interrupt: selector is not present"));
EXCEPTION(NP_EXCEPTION, exc_errcode);
}
is32bit = gsdp->type & CPU_SYSDESC_TYPE_32BIT;
if (!SEG_IS_CONFORMING_CODE(&cs_sel.desc) && (cs_sel.desc.dpl < CPU_STAT_CPL)) {
stacksize = errorp ? 12 : 10;
if (!CPU_STAT_VM86) {
VERBOSE(("interrupt: INTER-PRIVILEGE-LEVEL-INTERRUPT"));
} else {
/* VM86 */
VERBOSE(("interrupt: INTERRUPT-FROM-VIRTUAL-8086-MODE"));
if (cs_sel.desc.dpl != 0) {
/* 16.3.1.1 */
VERBOSE(("interrupt: DPL[CS](%d) != 0", cs_sel.desc.dpl));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
stacksize += 8;
}
if (is32bit) {
stacksize *= 2;
}
/* get stack pointer from TSS */
get_stack_pointer_from_tss(cs_sel.desc.dpl, &new_ss, &new_sp);
/* parse stack segment descriptor */
rv = parse_selector(&ss_sel, new_ss);
/* update exception error code */
exc_errcode = ss_sel.idx;
if (intrtype == INTR_TYPE_EXTINTR)
exc_errcode++;
if (rv < 0) {
VERBOSE(("interrupt: parse_selector (selector = %04x, rv = %d)", new_ss, rv));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
/* check privilege level */
if (ss_sel.rpl != cs_sel.desc.dpl) {
VERBOSE(("interrupt: selector RPL[SS](%d) != DPL[CS](%d)", ss_sel.rpl, cs_sel.desc.dpl));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
if (ss_sel.desc.dpl != cs_sel.desc.dpl) {
VERBOSE(("interrupt: descriptor DPL[SS](%d) != DPL[CS](%d)", ss_sel.desc.dpl, cs_sel.desc.dpl));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
/* stack segment must be writable data segment. */
if (SEG_IS_SYSTEM(&ss_sel.desc)) {
VERBOSE(("interrupt: stack segment is system segment"));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
if (SEG_IS_CODE(&ss_sel.desc)) {
VERBOSE(("interrupt: stack segment is code segment"));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
if (!SEG_IS_WRITABLE_DATA(&ss_sel.desc)) {
VERBOSE(("interrupt: stack segment is read-only data segment"));
EXCEPTION(TS_EXCEPTION, exc_errcode);
}
/* not present */
if (selector_is_not_present(&ss_sel)) {
VERBOSE(("interrupt: selector is not present"));
EXCEPTION(SS_EXCEPTION, exc_errcode);
}
/* check stack room size */
cpu_stack_push_check(ss_sel.idx, &ss_sel.desc, new_sp, stacksize, ss_sel.desc.d);
/* out of range */
if (new_ip > cs_sel.desc.u.seg.limit) {
VERBOSE(("interrupt: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel.desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
load_ss(ss_sel.selector, &ss_sel.desc, cs_sel.desc.dpl);
CPU_ESP = new_sp;
load_cs(cs_sel.selector, &cs_sel.desc, cs_sel.desc.dpl);
CPU_EIP = new_ip;
if (is32bit) {
if (CPU_STAT_VM86) {
PUSH0_32(CPU_GS);
PUSH0_32(CPU_FS);
PUSH0_32(CPU_DS);
PUSH0_32(CPU_ES);
LOAD_SEGREG(CPU_GS_INDEX, 0);
CPU_STAT_SREG(CPU_GS_INDEX).valid = 0;
LOAD_SEGREG(CPU_FS_INDEX, 0);
CPU_STAT_SREG(CPU_FS_INDEX).valid = 0;
LOAD_SEGREG(CPU_DS_INDEX, 0);
CPU_STAT_SREG(CPU_DS_INDEX).valid = 0;
LOAD_SEGREG(CPU_ES_INDEX, 0);
CPU_STAT_SREG(CPU_ES_INDEX).valid = 0;
}
PUSH0_32(old_ss);
PUSH0_32(old_sp);
PUSH0_32(old_flags);
PUSH0_32(old_cs);
PUSH0_32(old_ip);
if (errorp) {
PUSH0_32(error_code);
}
} else {
if (CPU_STAT_VM86) {
ia32_panic("interrupt: 16bit gate && VM86");
}
PUSH0_16(old_ss);
PUSH0_16(old_sp);
PUSH0_16(old_flags);
PUSH0_16(old_cs);
PUSH0_16(old_ip);
if (errorp) {
PUSH0_16(error_code);
}
}
} else {
if (CPU_STAT_VM86) {
VERBOSE(("interrupt: VM86"));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
if (!SEG_IS_CONFORMING_CODE(&cs_sel.desc) && (cs_sel.desc.dpl != CPU_STAT_CPL)) {
VERBOSE(("interrupt: %sCONFORMING-CODE-SEGMENT(%d) && DPL[CS](%d) != CPL", SEG_IS_CONFORMING_CODE(&cs_sel.desc) ? "" : "NON-", cs_sel.desc.dpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, exc_errcode);
}
VERBOSE(("interrupt: INTRA-PRIVILEGE-LEVEL-INTERRUPT"));
stacksize = errorp ? 8 : 6;
if (is32bit) {
stacksize *= 2;
}
/* check stack room size */
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
/*
* 17.1
* コールゲート、割り込みゲート、またはトラップゲートを通じて
* プログラムの制御を他のコード・セグメントに移行するときは、
* 移行中に使用されるオペランド・サイズは使用されるゲートの
* タイプ（16 ビットまたは32 ビット）によって決まる（移行命
* 令のD フラグ、プリフィックスのいずれにもよらない）。
*/
SS_PUSH_CHECK1(sp, stacksize, is32bit);
/* out of range */
if (new_ip > cs_sel.desc.u.seg.limit) {
VERBOSE(("interrupt: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel.desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
load_cs(cs_sel.selector, &cs_sel.desc, CPU_STAT_CPL);
CPU_EIP = new_ip;
if (is32bit) {
PUSH0_32(old_flags);
PUSH0_32(old_cs);
PUSH0_32(old_ip);
if (errorp) {
PUSH0_32(error_code);
}
} else {
PUSH0_16(old_flags);
PUSH0_16(old_cs);
PUSH0_16(old_ip);
if (errorp) {
PUSH0_16(error_code);
}
}
}
set_eflags(new_flags, mask);
VERBOSE(("interrupt: new EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_EIP, CPU_SS, CPU_ESP));
}
