--- np2/i386c/ia32/ctrlxfer.c	2004/01/26 15:23:21	1.4
+++ np2/i386c/ia32/ctrlxfer.c	2004/02/04 13:24:35	1.7
@@ -1,4 +1,4 @@
-/*	$Id: ctrlxfer.c,v 1.4 2004/01/26 15:23:21 monaka Exp $	*/
+/*	$Id: ctrlxfer.c,v 1.7 2004/02/04 13:24:35 monaka Exp $	*/
 
 /*
  * Copyright (c) 2003 NONAKA Kimihiro
@@ -34,8 +34,6 @@
 #include "ctrlxfer.h"
 
 
-static void check_segreg(void);
-
 /*------------------------------------------------------------------------------
  * JMPfar_pm
  */
@@ -53,7 +51,7 @@ JMPfar_pm(WORD selector, DWORD new_ip)
 	VERBOSE(("JMPfar_pm: old EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_PREV_EIP, CPU_SS, CPU_ESP));
 	VERBOSE(("JMPfar_pm: selector = 0x%04x, new_ip = 0x%08x", selector, new_ip));
 
-	rv = parse_selector(&jmp_sel, selector);
+	rv = parse_selector(&jmp_sel, selector, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("JMPfar_pm: parse_selector (selector = %04x, rv = %d)", selector, rv));
 		EXCEPTION(GP_EXCEPTION, jmp_sel.idx);
@@ -175,7 +173,7 @@ JMPfar_pm_call_gate(selector_t *callgate
 	}
 
 	/* parse code segment selector */
-	rv = parse_selector(&cs_sel, callgate_sel->desc.u.gate.selector);
+	rv = parse_selector(&cs_sel, callgate_sel->desc.u.gate.selector, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("JMPfar_pm: parse_selector (selector = %04x, rv = %d)", callgate_sel->desc.u.gate.selector, rv));
 		EXCEPTION(GP_EXCEPTION, cs_sel.idx);
@@ -268,7 +266,7 @@ JMPfar_pm_task_gate(selector_t *taskgate
 	}
 
 	/* parse tss selector */
-	rv = parse_selector(&tss_sel, taskgate_sel->desc.u.gate.selector);
+	rv = parse_selector(&tss_sel, taskgate_sel->desc.u.gate.selector, CPU_IS_USER_MODE());
 	if (rv < 0 || tss_sel.ldt) {
 		VERBOSE(("JMPfar_pm: parse_selector (selector = %04x, rv = %d, %cDT)", taskgate_sel->desc.u.gate.selector, rv, tss_sel.ldt ? 'L' : 'G'));
 		EXCEPTION(GP_EXCEPTION, tss_sel.idx);
@@ -364,7 +362,7 @@ CALLfar_pm(WORD selector, DWORD new_ip)
 	VERBOSE(("CALLfar_pm: old EIP = %04x:%08x, ESP = %04x:%08x", CPU_CS, CPU_PREV_EIP, CPU_SS, CPU_ESP));
 	VERBOSE(("CALLfar_pm: selector = 0x%04x, new_ip = 0x%08x", selector, new_ip));
 
-	rv = parse_selector(&call_sel, selector);
+	rv = parse_selector(&call_sel, selector, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("CALLfar_pm: parse_selector (selector = %04x, rv = %d)", selector, rv));
 		EXCEPTION(GP_EXCEPTION, call_sel.idx);
@@ -514,7 +512,7 @@ CALLfar_pm_call_gate(selector_t *callgat
 	}
 
 	/* parse code segment descriptor */
-	rv = parse_selector(&cs_sel, callgate_sel->desc.u.gate.selector);
+	rv = parse_selector(&cs_sel, callgate_sel->desc.u.gate.selector, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("CALLfar_pm: parse_selector (selector = %04x, rv = %d)", callgate_sel->desc.u.gate.selector, rv));
 		EXCEPTION(GP_EXCEPTION, cs_sel.idx);
@@ -631,7 +629,7 @@ CALLfar_pm_call_gate_more_privilege(sele
 	get_stack_from_tss(cs_sel->desc.dpl, &tss_ss, &tss_esp);
 
 	/* parse stack segment descriptor */
-	rv = parse_selector(&ss_sel, tss_ss);
+	rv = parse_selector(&ss_sel, tss_ss, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("CALLfar_pm: parse_selector (selector = %04x, rv = %d)", tss_ss, rv));
 		EXCEPTION(TS_EXCEPTION, ss_sel.idx);
@@ -753,7 +751,7 @@ CALLfar_pm_task_gate(selector_t *taskgat
 	}
 
 	/* tss descriptor */
-	rv = parse_selector(&tss_sel, taskgate_sel->desc.u.gate.selector);
+	rv = parse_selector(&tss_sel, taskgate_sel->desc.u.gate.selector, CPU_IS_USER_MODE());
 	if (rv < 0 || tss_sel.ldt) {
 		VERBOSE(("CALLfar_pm: parse_selector (selector = %04x, rv = %d, %s)", tss_sel.selector, rv, tss_sel.ldt ? "LDT" : "GDT"));
 		EXCEPTION(GP_EXCEPTION, tss_sel.idx);
@@ -840,11 +838,12 @@ CALLfar_pm_tss(selector_t *tss_sel)
 void
 RETfar_pm(DWORD nbytes)
 {
-	selector_t ret_sel, ss_sel;
+	selector_t ret_sel, ss_sel, temp_sel;
 	DWORD sp;
 	DWORD new_ip, new_sp;
 	WORD 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));
 
@@ -863,7 +862,7 @@ RETfar_pm(DWORD nbytes)
 		new_cs = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 2);
 	}
 
-	rv = parse_selector(&ret_sel, new_cs);
+	rv = parse_selector(&ret_sel, new_cs, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("RETfar_pm: parse_selector (selector = %04x, rv = %d, %s)", ret_sel.selector, rv));
 		EXCEPTION(GP_EXCEPTION, ret_sel.idx);
@@ -932,7 +931,7 @@ RETfar_pm(DWORD nbytes)
 			new_ss = cpu_vmemoryread_w(CPU_SS_INDEX, sp + 4 + nbytes + 2);
 		}
 
-		rv = parse_selector(&ss_sel, new_ss);
+		rv = parse_selector(&ss_sel, new_ss, CPU_IS_USER_MODE());
 		if (rv < 0) {
 			VERBOSE(("RETfar_pm: parse_selector (selector = %04x, rv = %d, %s)", ss_sel.selector, rv));
 			EXCEPTION(GP_EXCEPTION, ss_sel.idx);
@@ -984,7 +983,48 @@ RETfar_pm(DWORD nbytes)
 		CPU_ESP = new_sp + nbytes;
 
 		/* check segment register */
-		check_segreg();
+		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), CPU_IS_USER_MODE());
+			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));
@@ -994,19 +1034,15 @@ RETfar_pm(DWORD nbytes)
 /*------------------------------------------------------------------------------
  * IRET_pm
  */
-
-#undef	IA32_RETURN_FROM_VM86
-
 static void IRET_pm_nested_task(void);
 static void IRET_pm_return_to_vm86(DWORD new_ip, DWORD new_cs, DWORD new_flags);
-#if defined(IA32_RETURN_FROM_VM86)
 static void IRET_pm_return_from_vm86(DWORD new_ip, DWORD new_cs, DWORD new_flags);
-#endif	/* IA32_RETURN_FROM_VM86 */
 
 void
 IRET_pm(void)
 {
 	selector_t iret_sel, ss_sel;
+	descriptor_t *dp;
 	DWORD sp;
 	DWORD stacksize;	/* for RETURN-TO-SAME-PRIVILEGE-LEVEL */
 	DWORD mask = 0;
@@ -1014,10 +1050,11 @@ IRET_pm(void)
 	WORD new_cs, new_ss;
 	int old_cpl;
 	int rv;
+	int i;
 
 	VERBOSE(("IRET_pm: old EIP = %04x:%08x, old ESP = %04x:%08x", CPU_CS, CPU_PREV_EIP, CPU_SS, CPU_ESP));
 
-	if (CPU_EFLAG & NT_FLAG) {
+	if (!(CPU_EFLAG & VM_FLAG) && (CPU_EFLAG & NT_FLAG)) {
 		/* TASK-RETURN: PE=1, VM=0, NT=1 */
 		IRET_pm_nested_task();
 		VERBOSE(("IRET_pm: new EIP = %04x:%08x, new ESP = %04x:%08x", CPU_CS, CPU_EIP, CPU_SS, CPU_ESP));
@@ -1043,7 +1080,6 @@ IRET_pm(void)
 	}
 	VERBOSE(("IRET_pm: new_ip = %08x, new_cs = %04x, new_eflags = %08x", new_ip, new_cs, new_flags));
 
-#ifdef	IA32_RETURN_FROM_VM86
 	if (CPU_EFLAG & VM_FLAG) {
 		/* RETURN-FROM-VIRTUAL-8086-MODE */
 		IRET_pm_return_from_vm86(new_ip, new_cs, new_flags);
@@ -1051,7 +1087,6 @@ IRET_pm(void)
 		CPU_STAT_NERROR = 0;
 		return;
 	}
-#endif	/* IA32_RETURN_FROM_VM86 */
 
 	if (new_flags & VM_FLAG) {
 		/* RETURN-TO-VIRTUAL-8086-MODE */
@@ -1064,7 +1099,7 @@ IRET_pm(void)
 	/* PROTECTED-MODE-RETURN */
 	VERBOSE(("IRET_pm: PE=1, VM=0 in flags image"));
 
-	rv = parse_selector(&iret_sel, new_cs);
+	rv = parse_selector(&iret_sel, new_cs, CPU_IS_USER_MODE());
 	if (rv < 0) {
 		VERBOSE(("IRET_pm: parse_selector (selector = %04x, rv = %d)", iret_sel.selector, rv));
 		EXCEPTION(GP_EXCEPTION, iret_sel.idx);
@@ -1110,7 +1145,7 @@ IRET_pm(void)
 		}
 		VERBOSE(("IRET_pm: new_sp = 0x%08x, new_ss = 0x%04x", new_sp, new_ss));
 
-		rv = parse_selector(&ss_sel, new_ss);
+		rv = parse_selector(&ss_sel, new_ss, CPU_IS_USER_MODE());
 		if (rv < 0) {
 			VERBOSE(("IRET_pm: parse_selector (selector = %04x, rv = %d)", ss_sel.selector, rv));
 			EXCEPTION(GP_EXCEPTION, ss_sel.idx);
@@ -1189,11 +1224,23 @@ IRET_pm(void)
 
 	if (iret_sel.rpl > old_cpl) {
 		/* RETURN-OUTER-PRIVILEGE-LEVEL */
+
 		load_ss(ss_sel.selector, &ss_sel.desc, iret_sel.rpl);
 		CPU_ESP = new_sp;
 
 		/* check segment register */
-		check_segreg();
+		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);
+					continue;
+				}
+			}
+		}
 	} else {
 		/* RETURN-TO-SAME-PRIVILEGE-LEVEL */
 		if (CPU_STAT_SS32) {
@@ -1219,12 +1266,8 @@ IRET_pm_nested_task(void)
 
 	VERBOSE(("IRET_pm: TASK-RETURN: PE=1, VM=0, NT=1"));
 
-	if (CPU_STAT_VM86) {
-		ia32_panic("IRET_pm: VM86");
-	}
-
 	new_cs = get_link_selector_from_tss();
-	rv = parse_selector(&iret_sel, new_cs);
+	rv = parse_selector(&iret_sel, new_cs, CPU_IS_USER_MODE());
 	if (rv < 0 || iret_sel.ldt) {
 		VERBOSE(("IRET_pm: parse_selector (selector = %04x, rv = %d)", iret_sel.selector, rv));
 		EXCEPTION(GP_EXCEPTION, iret_sel.idx);
@@ -1305,7 +1348,6 @@ IRET_pm_return_to_vm86(DWORD new_ip, DWO
 	SET_EIP(new_ip);
 }
 
-#ifdef	IA32_RETURN_FROM_VM86
 /*---
  * IRET_pm: VM_FLAG
  */
@@ -1338,52 +1380,3 @@ IRET_pm_return_from_vm86(DWORD new_ip, D
 	VERBOSE(("IRET_pm: trap to virtual-8086 monitor: VM=1, IOPL<3"));
 	EXCEPTION(GP_EXCEPTION, 0);
 }
-#endif	/* IA32_RETURN_FROM_VM86 */
-
-
-/*-----
- * Misc.
- */
-static void
-check_segreg(void)
-{
-	selector_t temp_sel;
-	BOOL valid;
-	int rv;
-	int i;
-
-	/* check segment register */
-	for (i = 0; i < CPU_SEGREG_NUM; i++) {
-		if (i == CPU_CS_INDEX || i == CPU_SS_INDEX)
-			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(i).valid = 0;
-			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;
-		}
-	}
-}