/*---
* 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
IRET_pm(void)
{
UINT32 sp;
UINT32 new_ip, new_flags;
UINT16 new_cs;
VERBOSE(("IRET_pm: old EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_PREV_EIP, CPU_SS, CPU_ESP));
if (!(CPU_EFLAG & VM_FLAG) && (CPU_EFLAG & NT_FLAG)) {
/* TASK-RETURN: PE=1, VM=0, NT=1 */
IRET_pm_nested_task();
} else {
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
if (CPU_INST_OP32) {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 12);
new_ip = cpu_vmemoryread_d(CPU_SS_INDEX, sp);
new_cs = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4);
new_flags = cpu_vmemoryread_d(CPU_SS_INDEX, sp + 8);
} else {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 6);
new_ip = cpu_vmemoryread_w(CPU_SS_INDEX, sp);
new_cs = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 2);
new_flags = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4);
}
VERBOSE(("IRET_pm: new_ip = %08x, new_cs = %04x, new_eflags = %08x", new_ip, new_cs, new_flags));
if (CPU_EFLAG & VM_FLAG) {
/* RETURN-FROM-VIRTUAL-8086-MODE */
IRET_pm_return_from_vm86(new_cs, new_ip, new_flags);
} else if (new_flags & VM_FLAG) {
/* RETURN-TO-VIRTUAL-8086-MODE */
IRET_pm_return_to_vm86(new_cs, new_ip, new_flags);
} else {
/* PROTECTED-MODE-RETURN */
IRET_pm_protected_mode_return(new_cs, new_ip, new_flags);
}
}
VERBOSE(("IRET_pm: new EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_EIP, CPU_SS, CPU_ESP));
}
void debugsub_status(void) {
static int filenum = 0;
FILEH fh;
OEMCHAR work[512];
const OEMCHAR *p;
OEMSPRINTF(work, file_i386reg, filenum);
fh = file_create_c(work);
if (fh != FILEH_INVALID) {
p = debugsub_regs();
file_write(fh, p, OEMSTRLEN(p) * sizeof(OEMCHAR));
OEMSPRINTF(work, str_picstat,
pic.pi[0].imr, pic.pi[0].irr, pic.pi[0].isr,
pic.pi[1].imr, pic.pi[1].irr, pic.pi[1].isr,
mouseif.upd8255.portc, sysport.c);
file_write(fh, work, OEMSTRLEN(work) * sizeof(OEMCHAR));
OEMSPRINTF(work, OEMTEXT("CS = %.8x:%.8x") OEMTEXT(CRLITERAL),
CPU_STAT_SREGBASE(CPU_CS_INDEX),
CPU_STAT_SREGLIMIT(CPU_CS_INDEX));
file_write(fh, work, OEMSTRLEN(work) * sizeof(OEMCHAR));
file_close(fh);
}
OEMSPRINTF(work, file_i386cs, filenum);
debugwriteseg(work, &CPU_STAT_SREG(CPU_CS_INDEX), CPU_EIP & 0xffff0000, 0x10000);
OEMSPRINTF(work, file_i386ds, filenum);
debugwriteseg(work, &CPU_STAT_SREG(CPU_DS_INDEX), 0, 0x10000);
OEMSPRINTF(work, file_i386es, filenum);
debugwriteseg(work, &CPU_STAT_SREG(CPU_ES_INDEX), 0, 0x10000);
OEMSPRINTF(work, file_i386ss, filenum);
debugwriteseg(work, &CPU_STAT_SREG(CPU_SS_INDEX), CPU_ESP & 0xffff0000, 0x10000);
filenum++;
}
/*---
* IRET_pm: new_flags & VM_FLAG
*/
static void
IRET_pm_return_to_vm86(UINT16 new_cs, UINT32 new_ip, UINT32 new_flags)
{
UINT16 segsel[CPU_SEGREG_NUM];
UINT32 sp;
UINT32 new_sp;
int i;
VERBOSE(("IRET_pm: Interrupt procedure was in virtual-8086 mode: PE=1, VM=1 in flags image"));
if (CPU_STAT_CPL != 0) {
ia32_panic("IRET_pm: CPL != 0");
}
if (!CPU_INST_OP32) {
ia32_panic("IRET_pm: 16bit mode");
}
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 36);
new_sp = cpu_vmemoryread_d(CPU_SS_INDEX, sp + 12);
segsel[CPU_SS_INDEX] = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 16);
segsel[CPU_ES_INDEX] = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 20);
segsel[CPU_DS_INDEX] = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 24);
segsel[CPU_FS_INDEX] = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 28);
segsel[CPU_GS_INDEX] = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 32);
segsel[CPU_CS_INDEX] = (UINT16)new_cs;
for (i = 0; i < CPU_SEGREG_NUM; i++) {
CPU_REGS_SREG(i) = segsel[i];
CPU_STAT_SREG_INIT(i);
}
/* to VM86 mode */
set_eflags(new_flags, IOPL_FLAG|I_FLAG|VM_FLAG|RF_FLAG);
new_sp &= 0xffff;
new_ip &= 0xffff;
CPU_ESP = new_sp;
SET_EIP(new_ip);
}
void
ia32_initreg(void)
{
int i;
CPU_STATSAVE.cpu_inst_default.seg_base = (UINT32)-1;
CPU_EDX = (CPU_FAMILY << 8) | (CPU_MODEL << 4) | CPU_STEPPING;
CPU_EFLAG = 2;
CPU_CR0 = CPU_CR0_CD | CPU_CR0_NW;
#if defined(USE_FPU)
CPU_CR0 &= ~CPU_CR0_EM;
CPU_CR0 |= CPU_CR0_ET;
#else
CPU_CR0 |= CPU_CR0_EM | CPU_CR0_NE;
CPU_CR0 &= ~(CPU_CR0_MP | CPU_CR0_ET);
#endif
CPU_MXCSR = 0x1f80;
CPU_GDTR_BASE = 0x0;
CPU_GDTR_LIMIT = 0xffff;
CPU_IDTR_BASE = 0x0;
CPU_IDTR_LIMIT = 0xffff;
CPU_LDTR_BASE = 0x0;
CPU_LDTR_LIMIT = 0xffff;
CPU_TR_BASE = 0x0;
CPU_TR_LIMIT = 0xffff;
CPU_STATSAVE.cpu_regs.dr[6] = 0xffff1ff0;
for (i = 0; i < CPU_SEGREG_NUM; ++i) {
segdesc_init(i, 0, &CPU_STAT_SREG(i));
}
LOAD_SEGREG(CPU_CS_INDEX, 0xf000);
CPU_STAT_CS_BASE = 0xffff0000;
CPU_EIP = 0xfff0;
CPU_ADRSMASK = 0x000fffff;
tlb_init();
#if defined(USE_FPU)
fpu_init();
#endif
}
REG80 MEMCALL
cpu_vmemoryread_f(int idx, UINT32 offset)
{
descriptor_t *sdp;
UINT32 addr;
int exc;
__ASSERT((unsigned int)idx < CPU_SEGREG_NUM);
sdp = &CPU_STAT_SREG(idx);
addr = sdp->u.seg.segbase + offset;
if (!CPU_STAT_PM)
return cpu_memoryread_f(addr);
if (!SEG_IS_VALID(sdp)) {
exc = GP_EXCEPTION;
goto err;
}
if (!(sdp->flag & CPU_DESC_FLAG_READABLE)) {
cpu_memoryread_check(sdp, offset, 10, CHOOSE_EXCEPTION(idx));
} else if (!(sdp->flag & CPU_DESC_FLAG_WHOLEADR)) {
if (!check_limit_upstairs(sdp, offset, 10, SEG_IS_32BIT(sdp)))
goto range_failure;
}
return cpu_lmemoryread_f(addr, CPU_PAGE_READ_DATA | CPU_STAT_USER_MODE);
range_failure:
VERBOSE(("cpu_vmemoryread_f: type = %d, offset = %08x, limit = %08x", sdp->type, offset, sdp->u.seg.limit));
exc = CHOOSE_EXCEPTION(idx);
err:
EXCEPTION(exc, 0);
{
REG80 dummy;
memset(&dummy, 0, sizeof(dummy));
return dummy; /* compiler happy */
}
}
void MEMCALL
cpu_vmemorywrite_f(int idx, UINT32 offset, const REG80 *value)
{
descriptor_t *sdp;
UINT32 addr;
int exc;
__ASSERT((unsigned int)idx < CPU_SEGREG_NUM);
sdp = &CPU_STAT_SREG(idx);
addr = sdp->u.seg.segbase + offset;
if (!CPU_STAT_PM) {
cpu_memorywrite_f(addr, value);
return;
}
if (!SEG_IS_VALID(sdp)) {
exc = GP_EXCEPTION;
goto err;
}
if (!(sdp->flag & CPU_DESC_FLAG_WRITABLE)) {
cpu_memorywrite_check(sdp, offset, 10, CHOOSE_EXCEPTION(idx));
} else if (!(sdp->flag & CPU_DESC_FLAG_WHOLEADR)) {
if (!check_limit_upstairs(sdp, offset, 10, SEG_IS_32BIT(sdp)))
goto range_failure;
}
cpu_lmemorywrite_f(addr, value, CPU_PAGE_WRITE_DATA | CPU_STAT_USER_MODE);
return;
range_failure:
VERBOSE(("cpu_vmemorywrite_f: type = %d, offset = %08x, limit = %08x", sdp->type, offset, sdp->u.seg.limit));
exc = CHOOSE_EXCEPTION(idx);
err:
EXCEPTION(exc, 0);
}
void
RETfar_pm(UINT nbytes)
{
selector_t cs_sel, ss_sel, temp_sel;
UINT32 sp;
UINT32 new_ip, new_sp;
UINT16 new_cs, new_ss;
int rv;
int i;
VERBOSE(("RETfar_pm: old EIP = %04x:%08x, ESP = %04x:%08x, nbytes = %d", CPU_CS, CPU_PREV_EIP, CPU_SS, CPU_ESP, nbytes));
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
if (CPU_INST_OP32) {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, nbytes + 8);
new_ip = cpu_vmemoryread_d(CPU_SS_INDEX, sp);
new_cs = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4);
} else {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, nbytes + 4);
new_ip = cpu_vmemoryread_w(CPU_SS_INDEX, sp);
new_cs = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 2);
}
rv = parse_selector(&cs_sel, new_cs);
if (rv < 0) {
VERBOSE(("RETfar_pm: parse_selector (selector = %04x, rv = %d, %s)", cs_sel.selector, rv));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
/* check segment type */
if (!cs_sel.desc.s) {
VERBOSE(("RETfar_pm: return to system segment"));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
if (!cs_sel.desc.u.seg.c) {
VERBOSE(("RETfar_pm: return to data segment"));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
/* check privilege level */
if (cs_sel.rpl < CPU_STAT_CPL) {
VERBOSE(("RETfar_pm: RPL(%d) < CPL(%d)", cs_sel.rpl, CPU_STAT_CPL));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
if (!cs_sel.desc.u.seg.ec && (cs_sel.desc.dpl > cs_sel.rpl)) {
VERBOSE(("RETfar_pm: NON-COMFORMING-CODE-SEGMENT and DPL(%d) > RPL(%d)", cs_sel.desc.dpl, cs_sel.rpl));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
/* not present */
if (selector_is_not_present(&cs_sel)) {
VERBOSE(("RETfar_pm: returned code segment is not present"));
EXCEPTION(NP_EXCEPTION, cs_sel.idx);
}
if (cs_sel.rpl == CPU_STAT_CPL) {
VERBOSE(("RETfar_pm: RETURN-TO-SAME-PRIVILEGE-LEVEL"));
/* check code segment limit */
if (new_ip > cs_sel.desc.u.seg.limit) {
VERBOSE(("RETfar_pm: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel.desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
VERBOSE(("RETfar_pm: new_ip = %08x, new_cs = %04x", new_ip, cs_sel.selector));
if (CPU_INST_OP32) {
nbytes += 8;
} else {
nbytes += 4;
}
if (CPU_STAT_SS32) {
CPU_ESP += nbytes;
} else {
CPU_SP += (UINT16)nbytes;
}
load_cs(cs_sel.selector, &cs_sel.desc, CPU_STAT_CPL);
SET_EIP(new_ip);
} else {
VERBOSE(("RETfar_pm: RETURN-OUTER-PRIVILEGE-LEVEL"));
if (CPU_INST_OP32) {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 8 + 8 + nbytes);
new_sp = cpu_vmemoryread_d(CPU_SS_INDEX, sp + 8 + nbytes);
new_ss = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 8 + nbytes + 4);
} else {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 4 + 4 + nbytes);
new_sp = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4 + nbytes);
new_ss = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4 + nbytes + 2);
}
rv = parse_selector(&ss_sel, new_ss);
if (rv < 0) {
VERBOSE(("RETfar_pm: parse_selector (selector = %04x, rv = %d, %s)", ss_sel.selector, rv));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
/* check stack segment descriptor */
if (!ss_sel.desc.s) {
VERBOSE(("RETfar_pm: stack segment is system segment"));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
if (ss_sel.desc.u.seg.c) {
VERBOSE(("RETfar_pm: stack segment is code segment"));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
if (!ss_sel.desc.u.seg.wr) {
VERBOSE(("RETfar_pm: stack segment is read-only data segment"));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
/* check privilege level */
if (ss_sel.rpl != cs_sel.rpl) {
VERBOSE(("RETfar_pm: RPL[SS](%d) != RPL[CS](%d)", ss_sel.rpl, cs_sel.rpl));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
if (ss_sel.desc.dpl != cs_sel.rpl) {
VERBOSE(("RETfar_pm: DPL[SS](%d) != RPL[CS](%d)", ss_sel.desc.dpl, cs_sel.rpl));
EXCEPTION(GP_EXCEPTION, cs_sel.idx);
}
/* not present */
if (selector_is_not_present(&ss_sel)) {
VERBOSE(("RETfar_pm: stack segment is not present"));
EXCEPTION(SS_EXCEPTION, ss_sel.idx);
}
/* check code segment limit */
if (new_ip > cs_sel.desc.u.seg.limit) {
VERBOSE(("RETfar_pm: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel.desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
VERBOSE(("RETfar_pm: new_ip = %08x, new_cs = %04x", new_ip, cs_sel.selector));
VERBOSE(("RETfar_pm: new_sp = %08x, new_ss = %04x", new_sp, ss_sel.selector));
load_cs(cs_sel.selector, &cs_sel.desc, cs_sel.rpl);
SET_EIP(new_ip);
load_ss(ss_sel.selector, &ss_sel.desc, cs_sel.rpl);
if (CPU_STAT_SS32) {
CPU_ESP = new_sp + nbytes;
} else {
CPU_SP = (UINT16)(new_sp + nbytes);
}
/* check segment register */
for (i = 0; i < CPU_SEGREG_NUM; i++) {
descriptor_t *dp;
BOOL valid;
dp = &CPU_STAT_SREG(i);
if ((!dp->u.seg.c || !dp->u.seg.ec)
&& (CPU_STAT_SREG(i).dpl < CPU_STAT_CPL)) {
/* segment register is invalid */
CPU_REGS_SREG(i) = 0;
CPU_STAT_SREG_CLEAR(i);
continue;
}
rv = parse_selector(&temp_sel, CPU_REGS_SREG(i));
if (rv < 0) {
/* segment register is invalid */
CPU_REGS_SREG(i) = 0;
CPU_STAT_SREG_CLEAR(i);
continue;
}
valid = TRUE;
if (!temp_sel.desc.s) {
/* system segment */
valid = FALSE;
}
if (temp_sel.desc.u.seg.c && !temp_sel.desc.u.seg.wr) {
/* execute-only code segment */
valid = FALSE;
}
if (!temp_sel.desc.u.seg.c || !temp_sel.desc.u.seg.ec) {
if (CPU_STAT_CPL > temp_sel.desc.dpl) {
valid = FALSE;
}
}
if (!valid) {
/* segment register is invalid */
CPU_REGS_SREG(i) = 0;
CPU_STAT_SREG(i).valid = 0;
}
}
}
VERBOSE(("RETfar_pm: new EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_EIP, CPU_SS, CPU_ESP));
}
/*---
* 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);
}
/*---
* IRET_pm: OUTER-PRIVILEGE
*/
static void
IRET_pm_protected_mode_return_outer_privilege(const selector_t *cs_sel, UINT32 new_ip, UINT32 new_flags)
{
descriptor_t *dp;
selector_t ss_sel;
UINT32 mask;
UINT32 sp;
UINT32 new_sp;
UINT16 new_ss;
int rv;
int i;
VERBOSE(("IRET_pm: RETURN-OUTER-PRIVILEGE-LEVEL"));
if (CPU_STAT_SS32) {
sp = CPU_ESP;
} else {
sp = CPU_SP;
}
if (CPU_INST_OP32) {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 20);
new_sp = cpu_vmemoryread_d(CPU_SS_INDEX, sp + 12);
new_ss = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 16);
} else {
STACK_POP_CHECK(CPU_REGS_SREG(CPU_SS_INDEX), &CPU_STAT_SREG(CPU_SS_INDEX), sp, 10);
new_sp = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 6);
new_ss = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 8);
}
VERBOSE(("IRET_pm: new_sp = 0x%08x, new_ss = 0x%04x", new_sp, new_ss));
rv = parse_selector(&ss_sel, new_ss);
if (rv < 0) {
VERBOSE(("IRET_pm: parse_selector (selector = %04x, rv = %d)", ss_sel.selector, rv));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
/* check privilege level */
if (ss_sel.rpl != cs_sel->rpl) {
VERBOSE(("IRET_pm: RPL[SS](%d) != RPL[CS](%d)", ss_sel.rpl, cs_sel->rpl));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
if (ss_sel.desc.dpl != cs_sel->rpl) {
VERBOSE(("IRET_pm: DPL[SS](%d) != RPL[CS](%d)", ss_sel.desc.dpl, cs_sel->rpl));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
/* check stack segment descriptor */
if (!ss_sel.desc.s) {
VERBOSE(("IRET_pm: stack segment is system segment"));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
if (ss_sel.desc.u.seg.c) {
VERBOSE(("IRET_pm: stack segment is code segment"));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
if (!ss_sel.desc.u.seg.wr) {
VERBOSE(("IRET_pm: stack segment is read-only data segment"));
EXCEPTION(GP_EXCEPTION, ss_sel.idx);
}
/* not present */
if (selector_is_not_present(&ss_sel)) {
VERBOSE(("IRET_pm: stack segment is not present"));
EXCEPTION(SS_EXCEPTION, ss_sel.idx);
}
/* check code segment limit */
if (new_ip > cs_sel->desc.u.seg.limit) {
VERBOSE(("IRET_pm: new_ip is out of range. new_ip = %08x, limit = %08x", new_ip, cs_sel->desc.u.seg.limit));
EXCEPTION(GP_EXCEPTION, 0);
}
mask = 0;
if (CPU_INST_OP32)
mask |= RF_FLAG;
if (CPU_STAT_CPL <= CPU_STAT_IOPL)
mask |= I_FLAG;
if (CPU_STAT_CPL == 0) {
mask |= IOPL_FLAG;
if (CPU_INST_OP32) {
mask |= VM_FLAG|VIF_FLAG|VIP_FLAG;
}
}
/* set new register */
load_cs(cs_sel->selector, &cs_sel->desc, cs_sel->rpl);
SET_EIP(new_ip);
set_eflags(new_flags, mask);
load_ss(ss_sel.selector, &ss_sel.desc, cs_sel->rpl);
if (CPU_STAT_SS32) {
CPU_ESP = new_sp;
} else {
CPU_SP = (UINT16)new_sp;
}
/* check segment register */
for (i = 0; i < CPU_SEGREG_NUM; i++) {
if ((i != CPU_CS_INDEX) && (i != CPU_SS_INDEX)) {
dp = &CPU_STAT_SREG(i);
if ((!dp->u.seg.c || !dp->u.seg.ec)
&& (CPU_STAT_SREG(i).dpl < CPU_STAT_CPL)) {
/* segment register is invalid */
CPU_REGS_SREG(i) = 0;
CPU_STAT_SREG_CLEAR(i);
}
}
}
}
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));
}
