bs3-cpu-weird-1-x0.c@ 106330

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1	/* $Id: bs3-cpu-weird-1-x0.c 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* BS3Kit - bs3-cpu-weird-2, C test driver code (16-bit).
4	*/
5
6	/*
7	* Copyright (C) 2007-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define BS3_USE_X0_TEXT_SEG
42	#include <bs3kit.h>
43	#include <bs3-cmn-memory.h>
44	#include <iprt/asm.h>
45	#include <iprt/asm-amd64-x86.h>
46
47
48	/*********************************************************************************************************************************
49	* Defined Constants And Macros *
50	*********************************************************************************************************************************/
51	#undef CHECK_MEMBER
52	#define CHECK_MEMBER(a_szName, a_szFmt, a_Actual, a_Expected) \
53	do \
54	{ \
55	if ((a_Actual) == (a_Expected)) { /* likely */ } \
56	else bs3CpuWeird1_FailedF(a_szName "=" a_szFmt " expected " a_szFmt, (a_Actual), (a_Expected)); \
57	} while (0)
58
59	#define BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(a_Name, a_Label) \
60	extern FNBS3FAR a_Name##_c16, a_Name##_##a_Label##_c16; \
61	extern FNBS3FAR a_Name##_c32, a_Name##_##a_Label##_c32; \
62	extern FNBS3FAR a_Name##_c64, a_Name##_##a_Label##_c64
63
64	#define PROTO_ALL(a_Template) \
65	extern FNBS3FAR a_Template ## _c16, \
66	a_Template ## _c32, \
67	a_Template ## _c64
68
69	#define PROTO_ALL_WITH_END(a_Template) \
70	extern FNBS3FAR a_Template ## _c16, a_Template ## _c16_EndProc, \
71	a_Template ## _c32, a_Template ## _c32_EndProc, \
72	a_Template ## _c64, a_Template ## _c64_EndProc
73
74
75	/*********************************************************************************************************************************
76	* External Symbols *
77	*********************************************************************************************************************************/
78	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedMovSsInt80, int80);
79	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedPopSsInt80, int80);
80
81	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedMovSsInt3, int3);
82	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedPopSsInt3, int3);
83
84	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedMovSsBp, int3);
85	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedPopSsBp, int3);
86
87	BS3_CPU_WEIRD_1_EXTERN_ASM_FN_VARS(bs3CpuWeird1_InhibitedMovSsSyscall, syscall);
88
89
90	/*********************************************************************************************************************************
91	* Global Variables *
92	*********************************************************************************************************************************/
93	static const char BS3_FAR g_pszTestMode = (const char )1;
94	static BS3CPUVENDOR g_enmCpuVendor = BS3CPUVENDOR_INTEL;
95	static bool g_fVME = false;
96	//static uint8_t g_bTestMode = 1;
97	//static bool g_f16BitSys = 1;
98
99
100
101	/**
102	* Sets globals according to the mode.
103	*
104	* @param bTestMode The test mode.
105	*/
106	static void bs3CpuWeird1_SetGlobals(uint8_t bTestMode)
107	{
108	// g_bTestMode = bTestMode;
109	g_pszTestMode = Bs3GetModeName(bTestMode);
110	// g_f16BitSys = BS3_MODE_IS_16BIT_SYS(bTestMode);
111	g_usBs3TestStep = 0;
112	g_enmCpuVendor = Bs3GetCpuVendor();
113	g_fVME = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486
114	&& (Bs3RegGetCr4() & X86_CR4_VME);
115	}
116
117
118	/**
119	* Wrapper around Bs3TestFailedF that prefixes the error with g_usBs3TestStep
120	* and g_pszTestMode.
121	*/
122	static void bs3CpuWeird1_FailedF(const char *pszFormat, ...)
123	{
124	va_list va;
125
126	char szTmp[168];
127	va_start(va, pszFormat);
128	Bs3StrPrintfV(szTmp, sizeof(szTmp), pszFormat, va);
129	va_end(va);
130
131	Bs3TestFailedF("%u - %s: %s", g_usBs3TestStep, g_pszTestMode, szTmp);
132	}
133
134
135	/**
136	* Compares interrupt stuff.
137	*/
138	static void bs3CpuWeird1_CompareDbgInhibitRingXfer(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint8_t bXcpt,
139	int8_t cbPcAdjust, int8_t cbSpAdjust, uint32_t uDr6Expected,
140	uint8_t cbIretFrame, uint64_t uHandlerRsp)
141	{
142	uint32_t uDr6 = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386 ? Bs3RegGetDr6() : X86_DR6_INIT_VAL;
143	uint16_t const cErrorsBefore = Bs3TestSubErrorCount();
144	CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, bXcpt);
145	CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, 0);
146	CHECK_MEMBER("cbIretFrame", "%#04x", pTrapCtx->cbIretFrame, cbIretFrame);
147	CHECK_MEMBER("uHandlerRsp", "%#06RX64", pTrapCtx->uHandlerRsp, uHandlerRsp);
148	if (uDr6 != uDr6Expected)
149	bs3CpuWeird1_FailedF("dr6=%#010RX32 expected %#010RX32", uDr6, uDr6Expected);
150	Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, pStartCtx, cbPcAdjust, cbSpAdjust, 0 /fExtraEfl/, g_pszTestMode, g_usBs3TestStep);
151	if (Bs3TestSubErrorCount() != cErrorsBefore)
152	{
153	Bs3TrapPrintFrame(pTrapCtx);
154	Bs3TestPrintf("DR6=%#RX32; Handler: CS=%04RX16 SS:ESP=%04RX16:%08RX64 EFL=%RX64 cbIret=%#x\n",
155	uDr6, pTrapCtx->uHandlerCs, pTrapCtx->uHandlerSs, pTrapCtx->uHandlerRsp,
156	pTrapCtx->fHandlerRfl, pTrapCtx->cbIretFrame);
157	#if 0
158	Bs3TestPrintf("Halting in CompareIntCtx: bXcpt=%#x\n", bXcpt);
159	ASMHalt();
160	#endif
161	}
162	}
163
164	static uint64_t bs3CpuWeird1_GetTrapHandlerEIP(uint8_t bXcpt, uint8_t bMode, bool fV86)
165	{
166	if ( BS3_MODE_IS_RM_SYS(bMode)
167	\|\| (fV86 && BS3_MODE_IS_V86(bMode)))
168	{
169	PRTFAR16 paIvt = (PRTFAR16)Bs3XptrFlatToCurrent(0);
170	return paIvt[bXcpt].off;
171	}
172	if (BS3_MODE_IS_16BIT_SYS(bMode))
173	return Bs3Idt16[bXcpt].Gate.u16OffsetLow;
174	if (BS3_MODE_IS_32BIT_SYS(bMode))
175	return RT_MAKE_U32(Bs3Idt32[bXcpt].Gate.u16OffsetLow, Bs3Idt32[bXcpt].Gate.u16OffsetHigh);
176	return RT_MAKE_U64(RT_MAKE_U32(Bs3Idt64[bXcpt].Gate.u16OffsetLow, Bs3Idt32[bXcpt].Gate.u16OffsetHigh),
177	Bs3Idt64[bXcpt].Gate.u32OffsetTop);
178	}
179
180
181	static void bs3RegCtxScramble(PBS3REGCTX pCtx, uint8_t bTestMode)
182	{
183	if (BS3_MODE_IS_64BIT_SYS(bTestMode))
184	{
185	pCtx->r8.au32[0] ^= UINT32_C(0x2f460cb9);
186	pCtx->r8.au32[1] ^= UINT32_C(0x2dc346ff);
187	pCtx->r9.au32[0] ^= UINT32_C(0x9c50d12e);
188	pCtx->r9.au32[1] ^= UINT32_C(0x60be8859);
189	pCtx->r10.au32[0] ^= UINT32_C(0xa45fbe73);
190	pCtx->r10.au32[1] ^= UINT32_C(0x094140bf);
191	pCtx->r11.au32[0] ^= UINT32_C(0x8200148b);
192	pCtx->r11.au32[1] ^= UINT32_C(0x95dfc457);
193	pCtx->r12.au32[0] ^= UINT32_C(0xabc885f6);
194	pCtx->r12.au32[1] ^= UINT32_C(0xb9af126a);
195	pCtx->r13.au32[0] ^= UINT32_C(0xa2c4435c);
196	pCtx->r13.au32[1] ^= UINT32_C(0x1692b52e);
197	pCtx->r14.au32[0] ^= UINT32_C(0x85a56477);
198	pCtx->r14.au32[1] ^= UINT32_C(0x31a44a04);
199	pCtx->r15.au32[0] ^= UINT32_C(0x8d5b3072);
200	pCtx->r15.au32[1] ^= UINT32_C(0xc2ffce37);
201	}
202	}
203
204
205	typedef enum {
206	DbgInhibitRingXferType_SoftInt,
207	DbgInhibitRingXferType_Syscall
208	} DBGINHIBITRINGXFERTYPE;
209
210	static int bs3CpuWeird1_DbgInhibitRingXfer_Worker(uint8_t bTestMode, uint8_t bIntGate, uint8_t cbRingInstr, int8_t cbSpAdjust,
211	FPFNBS3FAR pfnTestCode, FPFNBS3FAR pfnTestLabel, DBGINHIBITRINGXFERTYPE enmType)
212	{
213	BS3REGCTX Ctx;
214	BS3TRAPFRAME TrapCtx;
215	BS3TRAPFRAME TrapExpectXfer; /* Expected registers after transfer (no #DB). */
216	BS3TRAPFRAME TrapExpectXferDb; /* Expected registers after transfer followed by some #DB. */
217	uint8_t bSavedDpl;
218	uint8_t const offTestLabel = BS3_FP_OFF(pfnTestLabel) - BS3_FP_OFF(pfnTestCode);
219	uint8_t const cbIretFrameSame = BS3_MODE_IS_16BIT_SYS(bTestMode) ? 6
220	: BS3_MODE_IS_32BIT_SYS(bTestMode) ? 12 : 40;
221	uint8_t const cbIretFrameRing = BS3_MODE_IS_16BIT_SYS(bTestMode) ? 10
222	: BS3_MODE_IS_32BIT_SYS(bTestMode) ? 20 : 40;
223	uint8_t const cbSpAdjSame = BS3_MODE_IS_64BIT_SYS(bTestMode) ? 48 : cbIretFrameSame;
224	bool const fAlwaysUd = enmType == DbgInhibitRingXferType_Syscall && bTestMode != BS3_MODE_LM64;
225	uint8_t bVmeMethod = 0;
226	uint8_t cbIretFrameDb; /* #DB before xfer */
227	uint64_t uHandlerRspDb; /* #DB before xfer */
228	BS3_XPTR_AUTO(uint32_t, StackXptr);
229
230	if (fAlwaysUd)
231	bIntGate = X86_XCPT_UD;
232
233	/* make sure they're allocated */
234	Bs3MemZero(&Ctx, sizeof(Ctx));
235	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
236	Bs3MemZero(&TrapExpectXfer, sizeof(TrapExpectXfer));
237	Bs3MemZero(&TrapExpectXferDb, sizeof(TrapExpectXferDb));
238
239	/*
240	* Make INT xx accessible from DPL 3 and create a ring-3 context that we can work with.
241	*/
242	bSavedDpl = Bs3TrapSetDpl(bIntGate, 3);
243
244	Bs3RegCtxSaveEx(&Ctx, bTestMode, 1024);
245	bs3RegCtxScramble(&Ctx, bTestMode);
246	Bs3RegCtxSetRipCsFromLnkPtr(&Ctx, pfnTestCode);
247	if (BS3_MODE_IS_16BIT_SYS(bTestMode))
248	g_uBs3TrapEipHint = Ctx.rip.u32;
249	Ctx.rflags.u32 &= ~X86_EFL_RF;
250
251	/* Raw-mode enablers. */
252	Ctx.rflags.u32 \|= X86_EFL_IF;
253	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486)
254	Ctx.cr0.u32 \|= X86_CR0_WP;
255
256	/* We put the SS value on the stack so we can easily set breakpoints there. */
257	Ctx.rsp.u32 -= 8;
258	BS3_XPTR_SET_FLAT(uint32_t, StackXptr, Ctx.rsp.u32); /* ASSUMES SS.BASE == 0!! */
259
260	/* ring-3 */
261	if (!BS3_MODE_IS_RM_OR_V86(bTestMode))
262	Bs3RegCtxConvertToRingX(&Ctx, 3);
263
264	/* V8086: Set IOPL to 3. */
265	if (BS3_MODE_IS_V86(bTestMode) && enmType != DbgInhibitRingXferType_Syscall)
266	{
267	Ctx.rflags.u32 \|= X86_EFL_IOPL;
268	if (g_fVME)
269	{
270	Bs3RegSetTr(BS3_SEL_TSS32_IRB);
271	#if 0
272	/* SDMv3b, 20.3.3 method 5: */
273	ASMBitClear(&Bs3SharedIntRedirBm, bIntGate);
274	bVmeMethod = 5;
275	#else
276	/* SDMv3b, 20.3.3 method 4 (similar to non-VME): */
277	ASMBitSet(&Bs3SharedIntRedirBm, bIntGate);
278	bVmeMethod = 4;
279	}
280	#endif
281	}
282
283	/* Make BP = SP since 16-bit can't use SP for addressing. */
284	Ctx.rbp = Ctx.rsp;
285
286	/*
287	* Test #0: Test run. Calc expected delayed #DB from it.
288	*/
289	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386)
290	{
291	Bs3RegSetDr7(0);
292	Bs3RegSetDr6(X86_DR6_INIT_VAL);
293	}
294	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
295	Bs3TrapSetJmpAndRestore(&Ctx, &TrapExpectXfer);
296	if (TrapExpectXfer.bXcpt != bIntGate)
297	{
298	Bs3TestFailedF("%u: bXcpt is %#x, expected %#x!\n", g_usBs3TestStep, TrapExpectXfer.bXcpt, bIntGate);
299	Bs3TrapPrintFrame(&TrapExpectXfer);
300	return 1;
301	}
302	Bs3MemCpy(&TrapExpectXferDb, &TrapExpectXfer, sizeof(TrapExpectXferDb));
303
304	if (!fAlwaysUd)
305	{
306	TrapExpectXferDb.Ctx.bCpl = 0;
307	TrapExpectXferDb.Ctx.cs = TrapExpectXfer.uHandlerCs;
308	TrapExpectXferDb.Ctx.ss = TrapExpectXfer.uHandlerSs;
309	TrapExpectXferDb.Ctx.rsp.u64 = TrapExpectXfer.uHandlerRsp;
310	TrapExpectXferDb.Ctx.rflags.u64 = TrapExpectXfer.fHandlerRfl;
311
312	if (enmType != DbgInhibitRingXferType_Syscall)
313	{
314	TrapExpectXferDb.cbIretFrame = TrapExpectXfer.cbIretFrame + cbIretFrameSame;
315	TrapExpectXferDb.uHandlerRsp = TrapExpectXfer.uHandlerRsp - cbSpAdjSame;
316	}
317	else
318	{
319	TrapExpectXfer.cbIretFrame = 0xff;
320	TrapExpectXferDb.cbIretFrame = cbIretFrameSame;
321	TrapExpectXfer.uHandlerRsp = Ctx.rsp.u - cbSpAdjust;
322	TrapExpectXferDb.uHandlerRsp = (TrapExpectXfer.uHandlerRsp & ~(uint64_t)15) - cbIretFrameSame;
323	}
324	if (BS3_MODE_IS_V86(bTestMode))
325	{
326	if (bVmeMethod >= 5)
327	{
328	TrapExpectXferDb.Ctx.rflags.u32 \|= X86_EFL_VM;
329	TrapExpectXferDb.Ctx.bCpl = 3;
330	TrapExpectXferDb.Ctx.rip.u64 = bs3CpuWeird1_GetTrapHandlerEIP(bIntGate, bTestMode, true);
331	TrapExpectXferDb.cbIretFrame = 36;
332	if (BS3_MODE_IS_16BIT_SYS(bTestMode))
333	TrapExpectXferDb.uHandlerRsp = Bs3Tss16.sp0 - TrapExpectXferDb.cbIretFrame;
334	else
335	TrapExpectXferDb.uHandlerRsp = Bs3Tss32.esp0 - TrapExpectXferDb.cbIretFrame;
336	}
337	else
338	{
339	TrapExpectXferDb.Ctx.ds = 0;
340	TrapExpectXferDb.Ctx.es = 0;
341	TrapExpectXferDb.Ctx.fs = 0;
342	TrapExpectXferDb.Ctx.gs = 0;
343	}
344	}
345	}
346
347	if (enmType != DbgInhibitRingXferType_Syscall)
348	{
349	cbIretFrameDb = TrapExpectXfer.cbIretFrame;
350	uHandlerRspDb = TrapExpectXfer.uHandlerRsp;
351	}
352	else
353	{
354	cbIretFrameDb = cbIretFrameRing;
355	uHandlerRspDb = BS3_ADDR_STACK_R0 - cbIretFrameRing;
356	}
357
358
359	/*
360	* Test #1: Single stepping ring-3. Ignored except for V8086 w/ VME.
361	*/
362	g_usBs3TestStep++;
363	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386)
364	{
365	Bs3RegSetDr7(0);
366	Bs3RegSetDr6(X86_DR6_INIT_VAL);
367	}
368	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
369	// Ctx.rflags.u32 \|= X86_EFL_TF;
370
371	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
372	if ( !BS3_MODE_IS_V86(bTestMode)
373	\|\| bVmeMethod < 5)
374	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, bIntGate, 0, 0, X86_DR6_INIT_VAL,
375	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
376	else
377	{
378	TrapExpectXferDb.Ctx.rflags.u32 \|= X86_EFL_TF;
379	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXferDb.Ctx, X86_XCPT_DB, offTestLabel, -2,
380	X86_DR6_INIT_VAL \| X86_DR6_BS,
381	TrapExpectXferDb.cbIretFrame, TrapExpectXferDb.uHandlerRsp);
382	TrapExpectXferDb.Ctx.rflags.u32 &= ~X86_EFL_TF;
383	}
384
385	Ctx.rflags.u32 &= ~X86_EFL_TF;
386	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386)
387	{
388	uint32_t uDr6Expect;
389
390	/*
391	* Test #2: Execution breakpoint on ring transition instruction.
392	* This hits on AMD-V (threadripper) but not on VT-x (skylake).
393	*/
394	g_usBs3TestStep++;
395	Bs3RegSetDr0(Bs3SelRealModeCodeToFlat(pfnTestLabel));
396	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_EO) \| X86_DR7_LEN(0, X86_DR7_LEN_BYTE));
397	Bs3RegSetDr6(X86_DR6_INIT_VAL);
398	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
399
400	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
401	Bs3RegSetDr7(0);
402	if (g_enmCpuVendor == BS3CPUVENDOR_AMD \|\| g_enmCpuVendor == BS3CPUVENDOR_HYGON)
403	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &Ctx, X86_XCPT_DB, offTestLabel, cbSpAdjust,
404	X86_DR6_INIT_VAL \| X86_DR6_B0, TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
405	else
406	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, bIntGate, 0, 0, X86_DR6_INIT_VAL,
407	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
408
409	/*
410	* Test #3: Same as above, but with the LE and GE flags set.
411	*/
412	g_usBs3TestStep++;
413	Bs3RegSetDr0(Bs3SelRealModeCodeToFlat(pfnTestLabel));
414	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_EO) \| X86_DR7_LEN(0, X86_DR7_LEN_BYTE) \| X86_DR7_LE \| X86_DR7_GE);
415	Bs3RegSetDr6(X86_DR6_INIT_VAL);
416	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
417
418	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
419	if (g_enmCpuVendor == BS3CPUVENDOR_AMD \|\| g_enmCpuVendor == BS3CPUVENDOR_HYGON)
420	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &Ctx, X86_XCPT_DB, offTestLabel, cbSpAdjust,
421	X86_DR6_INIT_VAL \| X86_DR6_B0, TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
422	else
423	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, bIntGate, 0, 0, X86_DR6_INIT_VAL,
424	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
425
426	/*
427	* Test #4: Execution breakpoint on pop ss / mov ss. Hits.
428	*
429	* Note! In real mode AMD-V updates the stack pointer, or something else is busted. Totally weird!
430	*
431	* Update: see Test #6 update.
432	*/
433	g_usBs3TestStep++;
434	Bs3RegSetDr0(Bs3SelRealModeCodeToFlat(pfnTestCode));
435	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_EO) \| X86_DR7_LEN(0, X86_DR7_LEN_BYTE));
436	Bs3RegSetDr6(X86_DR6_INIT_VAL);
437	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
438
439	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
440	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &Ctx, X86_XCPT_DB, 0, 0, X86_DR6_INIT_VAL \| X86_DR6_B0, cbIretFrameDb,
441	uHandlerRspDb - (BS3_MODE_IS_RM_SYS(bTestMode) ? cbSpAdjust : 0) );
442
443	/*
444	* Test #5: Same as above, but with the LE and GE flags set.
445	*/
446	g_usBs3TestStep++;
447	Bs3RegSetDr0(Bs3SelRealModeCodeToFlat(pfnTestCode));
448	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_EO) \| X86_DR7_LEN(0, X86_DR7_LEN_BYTE) \| X86_DR7_LE \| X86_DR7_GE);
449	Bs3RegSetDr6(X86_DR6_INIT_VAL);
450	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
451
452	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
453	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &Ctx, X86_XCPT_DB, 0, 0, X86_DR6_INIT_VAL \| X86_DR6_B0, cbIretFrameDb,
454	uHandlerRspDb - (BS3_MODE_IS_RM_SYS(bTestMode) ? cbSpAdjust : 0) );
455	Bs3RegSetDr7(0);
456
457	/*
458	* Test #6: Data breakpoint on SS load. The #DB is delivered after ring transition. Weird!
459	*
460	* Note! Intel loses the B0 status, probably for reasons similar to Pentium Pro errata 3. Similar
461	* erratum is seen with virtually every march since, e.g. skylake SKL009 & SKL111.
462	* Weirdly enougth, they seem to get this right in real mode. Go figure.
463	*
464	* Update: In real mode there is no ring transition, so we'll be trampling on
465	* breakpoint again (POP SS changes SP) when the INT/whatever instruction writes
466	* the return address.
467	*/
468	g_usBs3TestStep++;
469	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
470	Bs3RegSetDr0(BS3_XPTR_GET_FLAT(uint32_t, StackXptr));
471	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_RW) \| X86_DR7_LEN(0, X86_DR7_LEN_WORD));
472	Bs3RegSetDr6(X86_DR6_INIT_VAL);
473
474	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
475	Bs3RegSetDr7(0);
476	TrapExpectXferDb.Ctx.rip = TrapCtx.Ctx.rip; /// @todo fixme
477	Bs3RegSetDr7(0);
478	uDr6Expect = X86_DR6_INIT_VAL \| X86_DR6_B0;
479	if (g_enmCpuVendor == BS3CPUVENDOR_INTEL && (bTestMode != BS3_MODE_RM \|\| cbSpAdjust == 0))
480	uDr6Expect = X86_DR6_INIT_VAL;
481	if (!fAlwaysUd)
482	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXferDb.Ctx, X86_XCPT_DB, 0, 0, uDr6Expect,
483	cbIretFrameSame, TrapExpectXferDb.uHandlerRsp);
484	else
485	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, X86_XCPT_UD, 0, 0, uDr6Expect,
486	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
487
488	/*
489	* Test #7: Same as above, but with the LE and GE flags set.
490	*/
491	g_usBs3TestStep++;
492	*BS3_XPTR_GET(uint32_t, StackXptr) = Ctx.ss;
493	Bs3RegSetDr0(BS3_XPTR_GET_FLAT(uint32_t, StackXptr));
494	Bs3RegSetDr7(X86_DR7_L0 \| X86_DR7_G0 \| X86_DR7_RW(0, X86_DR7_RW_RW) \| X86_DR7_LEN(0, X86_DR7_LEN_WORD) \| X86_DR7_LE \| X86_DR7_GE);
495	Bs3RegSetDr6(X86_DR6_INIT_VAL);
496
497	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
498	TrapExpectXferDb.Ctx.rip = TrapCtx.Ctx.rip; /// @todo fixme
499	Bs3RegSetDr7(0);
500	uDr6Expect = X86_DR6_INIT_VAL \| X86_DR6_B0;
501	if (g_enmCpuVendor == BS3CPUVENDOR_INTEL && (bTestMode != BS3_MODE_RM \|\| cbSpAdjust == 0))
502	uDr6Expect = X86_DR6_INIT_VAL;
503	if (!fAlwaysUd)
504	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXferDb.Ctx, X86_XCPT_DB, 0, 0, uDr6Expect,
505	cbIretFrameSame, TrapExpectXferDb.uHandlerRsp);
506	else
507	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, X86_XCPT_UD, 0, 0, uDr6Expect,
508	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
509
510	if (!BS3_MODE_IS_RM_OR_V86(bTestMode))
511	{
512	/*
513	* Test #8: Data breakpoint on SS GDT entry. Half weird!
514	* Note! Intel loses the B1 status, see test #6.
515	*/
516	g_usBs3TestStep++;
517	*BS3_XPTR_GET(uint32_t, StackXptr) = (Ctx.ss & X86_SEL_RPL) \| BS3_SEL_SPARE_00;
518	Bs3GdteSpare00 = Bs3Gdt[Ctx.ss / sizeof(Bs3Gdt[0])];
519
520	Bs3RegSetDr1(Bs3SelPtrToFlat(&Bs3GdteSpare00));
521	Bs3RegSetDr7(X86_DR7_L1 \| X86_DR7_G1 \| X86_DR7_RW(1, X86_DR7_RW_RW) \| X86_DR7_LEN(1, X86_DR7_LEN_DWORD));
522	Bs3RegSetDr6(X86_DR6_INIT_VAL);
523
524	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
525	TrapExpectXferDb.Ctx.rip = TrapCtx.Ctx.rip; /// @todo fixme
526	Bs3RegSetDr7(0);
527	uDr6Expect = g_enmCpuVendor == BS3CPUVENDOR_INTEL ? X86_DR6_INIT_VAL : X86_DR6_INIT_VAL \| X86_DR6_B1;
528	if (!fAlwaysUd)
529	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXferDb.Ctx, X86_XCPT_DB, 0, 0, uDr6Expect,
530	cbIretFrameSame, TrapExpectXferDb.uHandlerRsp);
531	else
532	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, X86_XCPT_UD, 0, 0, uDr6Expect,
533	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
534
535	/*
536	* Test #9: Same as above, but with the LE and GE flags set.
537	*/
538	g_usBs3TestStep++;
539	*BS3_XPTR_GET(uint32_t, StackXptr) = (Ctx.ss & X86_SEL_RPL) \| BS3_SEL_SPARE_00;
540	Bs3GdteSpare00 = Bs3Gdt[Ctx.ss / sizeof(Bs3Gdt[0])];
541
542	Bs3RegSetDr1(Bs3SelPtrToFlat(&Bs3GdteSpare00));
543	Bs3RegSetDr7(X86_DR7_L1 \| X86_DR7_G1 \| X86_DR7_RW(1, X86_DR7_RW_RW) \| X86_DR7_LEN(1, X86_DR7_LEN_DWORD) \| X86_DR7_LE \| X86_DR7_GE);
544	Bs3RegSetDr6(X86_DR6_INIT_VAL);
545
546	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
547	TrapExpectXferDb.Ctx.rip = TrapCtx.Ctx.rip; /// @todo fixme
548	Bs3RegSetDr7(0);
549	uDr6Expect = g_enmCpuVendor == BS3CPUVENDOR_INTEL ? X86_DR6_INIT_VAL : X86_DR6_INIT_VAL \| X86_DR6_B1;
550	if (!fAlwaysUd)
551	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXferDb.Ctx, X86_XCPT_DB, 0, 0, uDr6Expect,
552	cbIretFrameSame, TrapExpectXferDb.uHandlerRsp);
553	else
554	bs3CpuWeird1_CompareDbgInhibitRingXfer(&TrapCtx, &TrapExpectXfer.Ctx, X86_XCPT_UD, 0, 0, uDr6Expect,
555	TrapExpectXfer.cbIretFrame, TrapExpectXfer.uHandlerRsp);
556	}
557
558	/*
559	* Cleanup.
560	*/
561	Bs3RegSetDr0(0);
562	Bs3RegSetDr1(0);
563	Bs3RegSetDr2(0);
564	Bs3RegSetDr3(0);
565	Bs3RegSetDr6(X86_DR6_INIT_VAL);
566	Bs3RegSetDr7(0);
567	}
568	Bs3TrapSetDpl(bIntGate, bSavedDpl);
569	return 0;
570	}
571
572
573	BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3CpuWeird1_DbgInhibitRingXfer)(uint8_t bMode)
574	{
575	if (BS3_MODE_IS_V86(bMode))
576	switch (bMode)
577	{
578	/** @todo some busted stack stuff with the 16-bit guys. Also, if VME is
579	* enabled, we're probably not able to do any sensible testing. */
580	case BS3_MODE_PP16_V86:
581	case BS3_MODE_PE16_V86:
582	case BS3_MODE_PAE16_V86:
583	return BS3TESTDOMODE_SKIPPED;
584	}
585	//if (bMode != BS3_MODE_PE16_V86) return BS3TESTDOMODE_SKIPPED;
586	//if (bMode != BS3_MODE_PAEV86) return BS3TESTDOMODE_SKIPPED;
587
588	bs3CpuWeird1_SetGlobals(bMode);
589
590	/** @todo test sysenter and syscall too. */
591	/** @todo test INTO. */
592	/** @todo test all V8086 software INT delivery modes (currently only 4 and 1). */
593
594	#define ASM_FN_ARGS(a_Name, a_Label, a_ModeSuff, a_Type) \
595	bs3CpuWeird1_##a_Name##_##a_ModeSuff, bs3CpuWeird1_##a_Name##_##a_Label##_##a_ModeSuff, DbgInhibitRingXferType_##a_Type
596
597	/* Note! Both ICEBP and BOUND has be checked cursorily and found not to be affected. */
598	if (BS3_MODE_IS_16BIT_CODE(bMode))
599	{
600	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x80, 2, 2, ASM_FN_ARGS(InhibitedPopSsInt80, int80, c16, SoftInt));
601	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x80, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt80, int80, c16, SoftInt));
602	if (!BS3_MODE_IS_V86(bMode) \|\| !g_fVME)
603	{
604	/** @todo explain why these GURU */
605	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 2, 2, ASM_FN_ARGS(InhibitedPopSsInt3, int3, c16, SoftInt));
606	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt3, int3, c16, SoftInt));
607	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 1, 2, ASM_FN_ARGS(InhibitedPopSsBp, int3, c16, SoftInt));
608	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 1, 0, ASM_FN_ARGS(InhibitedMovSsBp, int3, c16, SoftInt));
609	}
610	}
611	else if (BS3_MODE_IS_32BIT_CODE(bMode))
612	{
613	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x80, 2, 4, ASM_FN_ARGS(InhibitedPopSsInt80, int80, c32, SoftInt));
614	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x80, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt80, int80, c32, SoftInt));
615	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 2, 4, ASM_FN_ARGS(InhibitedPopSsInt3, int3, c32, SoftInt));
616	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt3, int3, c32, SoftInt));
617	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 1, 4, ASM_FN_ARGS(InhibitedPopSsBp, int3, c32, SoftInt));
618	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 1, 0, ASM_FN_ARGS(InhibitedMovSsBp, int3, c32, SoftInt));
619	}
620	else
621	{
622	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x80, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt80, int80, c64, SoftInt));
623	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 2, 0, ASM_FN_ARGS(InhibitedMovSsInt3, int3, c64, SoftInt));
624	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0x03, 1, 0, ASM_FN_ARGS(InhibitedMovSsBp, int3, c64, SoftInt));
625	}
626
627	/* On intel, syscall only works in long mode. */
628	/** @todo test this on AMD and extend it to non-64-bit modes */
629	if (BS3_MODE_IS_64BIT_SYS(bMode))
630	{
631	uint64_t const fSavedEfer = ASMRdMsr(MSR_K6_EFER);
632	ASMWrMsr(MSR_K8_SF_MASK, X86_EFL_TF);
633	ASMWrMsr(MSR_K8_LSTAR, g_pfnBs3Syscall64GenericFlat);
634	ASMWrMsr(MSR_K8_CSTAR, g_pfnBs3Syscall64GenericCompatibilityFlat);
635	ASMWrMsr(MSR_K6_STAR, (uint64_t)BS3_SEL_R0_CS64 << MSR_K6_STAR_SYSCALL_CS_SS_SHIFT);
636	ASMWrMsr(MSR_K6_EFER, fSavedEfer \| MSR_K6_EFER_SCE);
637
638	if (BS3_MODE_IS_16BIT_CODE(bMode))
639	{
640	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0xfe, 2, 0, ASM_FN_ARGS(InhibitedMovSsSyscall, syscall, c16, Syscall));
641	}
642	else if (BS3_MODE_IS_32BIT_CODE(bMode))
643	{
644	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0xfe, 2, 0, ASM_FN_ARGS(InhibitedMovSsSyscall, syscall, c32, Syscall));
645	}
646	else
647	{
648	bs3CpuWeird1_DbgInhibitRingXfer_Worker(bMode, 0xff, 2, 0, ASM_FN_ARGS(InhibitedMovSsSyscall, syscall, c64, Syscall));
649	}
650
651	ASMWrMsr(MSR_K6_EFER, fSavedEfer);
652	ASMWrMsr(MSR_K6_STAR, 0);
653	ASMWrMsr(MSR_K8_LSTAR, 0);
654	ASMWrMsr(MSR_K8_CSTAR, 0);
655	ASMWrMsr(MSR_K8_SF_MASK, 0);
656	}
657
658	return 0;
659	}
660
661
662	/*********************************************************************************************************************************
663	* IP / EIP Wrapping *
664	*********************************************************************************************************************************/
665	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapBenign1);
666	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapBenign2);
667	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapCpuId);
668	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapIn80);
669	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapOut80);
670	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapSmsw);
671	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapRdCr0);
672	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapRdDr0);
673	PROTO_ALL_WITH_END(bs3CpuWeird1_PcWrapWrDr0);
674
675	typedef enum { kPcWrapSetup_None, kPcWrapSetup_ZeroRax } PCWRAPSETUP;
676
677	/**
678	* Compares pc wraparound result.
679	*/
680	static uint8_t bs3CpuWeird1_ComparePcWrap(PCBS3TRAPFRAME pTrapCtx, PCBS3TRAPFRAME pTrapExpect)
681	{
682	uint16_t const cErrorsBefore = Bs3TestSubErrorCount();
683	CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, pTrapExpect->bXcpt);
684	CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, pTrapExpect->uErrCd);
685	Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, &pTrapExpect->Ctx, 0 /cbPcAdjust/, 0 /cbSpAdjust/, 0 /fExtraEfl/,
686	g_pszTestMode, g_usBs3TestStep);
687	if (Bs3TestSubErrorCount() != cErrorsBefore)
688	{
689	Bs3TrapPrintFrame(pTrapCtx);
690	Bs3TestPrintf("CS=%04RX16 SS:ESP=%04RX16:%08RX64 EFL=%RX64 cbIret=%#x\n",
691	pTrapCtx->uHandlerCs, pTrapCtx->uHandlerSs, pTrapCtx->uHandlerRsp,
692	pTrapCtx->fHandlerRfl, pTrapCtx->cbIretFrame);
693	#if 0
694	Bs3TestPrintf("Halting in ComparePcWrap: bXcpt=%#x\n", pTrapCtx->bXcpt);
695	ASMHalt();
696	#endif
697	return 1;
698	}
699	return 0;
700	}
701
702
703	static uint8_t bs3CpuWeird1_PcWrapping_Worker16(uint8_t bMode, RTSEL SelCode, uint8_t BS3_FAR *pbHead,
704	uint8_t BS3_FAR pbTail, uint8_t BS3_FAR pbAfter,
705	void const BS3_FAR *pvTemplate, size_t cbTemplate, PCWRAPSETUP enmSetup)
706	{
707	BS3TRAPFRAME TrapCtx;
708	BS3TRAPFRAME TrapExpect;
709	BS3REGCTX Ctx;
710	uint8_t bXcpt;
711
712	/* make sure they're allocated */
713	Bs3MemZero(&Ctx, sizeof(Ctx));
714	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
715	Bs3MemZero(&TrapExpect, sizeof(TrapExpect));
716
717	/*
718	* Create the expected result by first placing the code template
719	* at the start of the buffer and giving it a quick run.
720	*
721	* I cannot think of any instruction always causing #GP(0) right now, so
722	* we generate a ud2 and modify it instead.
723	*/
724	Bs3MemCpy(pbHead, pvTemplate, cbTemplate);
725	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) <= BS3CPU_80286)
726	{
727	pbHead[cbTemplate] = 0xcc; /* int3 */
728	bXcpt = X86_XCPT_BP;
729	}
730	else
731	{
732	pbHead[cbTemplate] = 0x0f; /* ud2 */
733	pbHead[cbTemplate + 1] = 0x0b;
734	bXcpt = X86_XCPT_UD;
735	}
736
737	Bs3RegCtxSaveEx(&Ctx, bMode, 1024);
738
739	Ctx.cs = SelCode;
740	Ctx.rip.u = 0;
741	switch (enmSetup)
742	{
743	case kPcWrapSetup_None:
744	break;
745	case kPcWrapSetup_ZeroRax:
746	Ctx.rax.u = 0;
747	break;
748	}
749
750	/* V8086: Set IOPL to 3. */
751	if (BS3_MODE_IS_V86(bMode))
752	Ctx.rflags.u32 \|= X86_EFL_IOPL;
753
754	Bs3TrapSetJmpAndRestore(&Ctx, &TrapExpect);
755	if (TrapExpect.bXcpt != bXcpt)
756	{
757
758	Bs3TestFailedF("%u: Setup: bXcpt is %#x, expected %#x!\n", g_usBs3TestStep, TrapExpect.bXcpt, bXcpt);
759	Bs3TrapPrintFrame(&TrapExpect);
760	return 1;
761	}
762
763	/*
764	* Adjust the contexts for the real test.
765	*/
766	Ctx.cs = SelCode;
767	Ctx.rip.u = (uint32_t)_64K - cbTemplate;
768
769	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) <= BS3CPU_80286)
770	TrapExpect.Ctx.rip.u = 1;
771	else
772	{
773	if (BS3_MODE_IS_16BIT_SYS(bMode))
774	TrapExpect.Ctx.rip.u = 0;
775	else
776	TrapExpect.Ctx.rip.u = UINT32_C(0x10000);
777	TrapExpect.bXcpt = X86_XCPT_GP;
778	TrapExpect.uErrCd = 0;
779	}
780
781	/*
782	* Prepare the buffer for 16-bit wrap around.
783	*/
784	Bs3MemSet(pbHead, 0xcc, 64); /* int3 */
785	if (bXcpt == X86_XCPT_UD)
786	{
787	pbHead[0] = 0x0f; /* ud2 */
788	pbHead[1] = 0x0b;
789	}
790	Bs3MemCpy(&pbTail[_4K - cbTemplate], pvTemplate, cbTemplate);
791	Bs3MemSet(pbAfter, 0xf1, 64); /* icebp / int1 */
792
793	/*
794	* Do a test run.
795	*/
796	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
797	if (!bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
798	{
799	#if 0 /* needs more work */
800	/*
801	* Slide the instruction template across the boundrary byte-by-byte and
802	* check that it triggers #GP on the initial instruction on 386+.
803	*/
804	unsigned cbTail;
805	unsigned cbHead;
806	g_usBs3TestStep++;
807	for (cbTail = cbTemplate - 1, cbHead = 1; cbTail > 0; cbTail--, cbHead++, g_usBs3TestStep++)
808	{
809	pbTail[X86_PAGE_SIZE - cbTail - 1] = 0xcc;
810	Bs3MemCpy(&pbTail[X86_PAGE_SIZE - cbTail], pvTemplate, cbTail);
811	Bs3MemCpy(pbHead, &((uint8_t const *)pvTemplate)[cbTail], cbHead);
812	if (bXcpt == X86_XCPT_BP)
813	pbHead[cbHead] = 0xcc; /* int3 */
814	else
815	{
816	pbHead[cbHead] = 0x0f; /* ud2 */
817	pbHead[cbHead + 1] = 0x0b;
818	}
819
820	Ctx.rip.u = (uint32_t)_64K - cbTail;
821	if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) <= BS3CPU_80286)
822	TrapExpect.Ctx.rip.u = cbHead + 1;
823	else
824	{
825	TrapExpect.Ctx.rip.u = Ctx.rip.u;
826	}
827
828	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
829	if (bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
830	return 1;
831	}
832	#endif
833	}
834	return 0;
835	}
836
837
838	static uint8_t bs3CpuWeird1_PcWrapping_Worker32(uint8_t bMode, RTSEL SelCode, uint8_t BS3_FAR *pbPage1,
839	uint8_t BS3_FAR *pbPage2, uint32_t uFlatPage2,
840	void const BS3_FAR *pvTemplate, size_t cbTemplate, PCWRAPSETUP enmSetup)
841	{
842	BS3TRAPFRAME TrapCtx;
843	BS3TRAPFRAME TrapExpect;
844	BS3REGCTX Ctx;
845	unsigned cbPage1;
846	unsigned cbPage2;
847
848	/* make sure they're allocated */
849	Bs3MemZero(&Ctx, sizeof(Ctx));
850	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
851	Bs3MemZero(&TrapExpect, sizeof(TrapExpect));
852
853	//Bs3TestPrintf("SelCode=%#x pbPage1=%p pbPage2=%p uFlatPage2=%RX32 pvTemplate=%p cbTemplate\n",
854	// SelCode, pbPage1, pbPage2, uFlatPage2, pvTemplate, cbTemplate);
855
856	/*
857	* Create the expected result by first placing the code template
858	* at the start of the buffer and giving it a quick run.
859	*/
860	Bs3MemSet(pbPage1, 0xcc, _4K);
861	Bs3MemSet(pbPage2, 0xcc, _4K);
862	Bs3MemCpy(&pbPage1[_4K - cbTemplate], pvTemplate, cbTemplate);
863	pbPage2[0] = 0x0f; /* ud2 */
864	pbPage2[1] = 0x0b;
865
866	Bs3RegCtxSaveEx(&Ctx, bMode, 1024);
867
868	Ctx.cs = BS3_SEL_R0_CS32;
869	Ctx.rip.u = uFlatPage2 - cbTemplate;
870	switch (enmSetup)
871	{
872	case kPcWrapSetup_None:
873	break;
874	case kPcWrapSetup_ZeroRax:
875	Ctx.rax.u = 0;
876	break;
877	}
878
879	Bs3TrapSetJmpAndRestore(&Ctx, &TrapExpect);
880	if (TrapExpect.bXcpt != X86_XCPT_UD)
881	{
882
883	Bs3TestFailedF("%u: Setup: bXcpt is %#x, expected %#x!\n", g_usBs3TestStep, TrapExpect.bXcpt, X86_XCPT_UD);
884	Bs3TrapPrintFrame(&TrapExpect);
885	return 1;
886	}
887
888	/*
889	* The real test uses the special CS selector.
890	*/
891	Ctx.cs = SelCode;
892	TrapExpect.Ctx.cs = SelCode;
893
894	/*
895	* Unlike 16-bit mode, the instruction may cross the wraparound boundary,
896	* so we test by advancing the template across byte-by-byte.
897	*/
898	for (cbPage1 = cbTemplate, cbPage2 = 0; cbPage1 > 0; cbPage1--, cbPage2++, g_usBs3TestStep++)
899	{
900	pbPage1[X86_PAGE_SIZE - cbPage1 - 1] = 0xcc;
901	Bs3MemCpy(&pbPage1[X86_PAGE_SIZE - cbPage1], pvTemplate, cbPage1);
902	Bs3MemCpy(pbPage2, &((uint8_t const *)pvTemplate)[cbPage1], cbPage2);
903	pbPage2[cbPage2] = 0x0f; /* ud2 */
904	pbPage2[cbPage2 + 1] = 0x0b;
905
906	Ctx.rip.u = UINT32_MAX - cbPage1 + 1;
907	TrapExpect.Ctx.rip.u = cbPage2;
908
909	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
910	if (bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
911	return 1;
912	}
913	return 0;
914	}
915
916
917	static uint8_t bs3CpuWeird1_PcWrapping_Worker64(uint8_t bMode, uint8_t BS3_FAR *pbBuf, uint32_t uFlatBuf,
918	void const BS3_FAR *pvTemplate, size_t cbTemplate, PCWRAPSETUP enmSetup)
919	{
920	uint8_t BS3_FAR * const pbPage1 = pbBuf; /* mapped at 0, 4G and 8G */
921	uint8_t BS3_FAR * const pbPage2 = &pbBuf[X86_PAGE_SIZE]; /* mapped at -4K, 4G-4K and 8G-4K. */
922	BS3TRAPFRAME TrapCtx;
923	BS3TRAPFRAME TrapExpect;
924	BS3REGCTX Ctx;
925	unsigned cbStart;
926	unsigned cbEnd;
927
928	/* make sure they're allocated */
929	Bs3MemZero(&Ctx, sizeof(Ctx));
930	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
931	Bs3MemZero(&TrapExpect, sizeof(TrapExpect));
932
933	/*
934	* Create the expected result by first placing the code template
935	* at the start of the buffer and giving it a quick run.
936	*/
937	Bs3MemCpy(pbPage1, pvTemplate, cbTemplate);
938	pbPage1[cbTemplate] = 0x0f; /* ud2 */
939	pbPage1[cbTemplate + 1] = 0x0b;
940
941	Bs3RegCtxSaveEx(&Ctx, bMode, 1024);
942
943	Ctx.rip.u = uFlatBuf;
944	switch (enmSetup)
945	{
946	case kPcWrapSetup_None:
947	break;
948	case kPcWrapSetup_ZeroRax:
949	Ctx.rax.u = 0;
950	break;
951	}
952
953	Bs3TrapSetJmpAndRestore(&Ctx, &TrapExpect);
954	if (TrapExpect.bXcpt != X86_XCPT_UD)
955	{
956
957	Bs3TestFailedF("%u: Setup: bXcpt is %#x, expected %#x!\n", g_usBs3TestStep, TrapExpect.bXcpt, X86_XCPT_UD);
958	Bs3TrapPrintFrame(&TrapExpect);
959	return 1;
960	}
961
962	/*
963	* Unlike 16-bit mode, the instruction may cross the wraparound boundary,
964	* so we test by advancing the template across byte-by-byte.
965	*
966	* Page #1 is mapped at address zero and Page #2 as the last one.
967	*/
968	Bs3MemSet(pbBuf, 0xf1, X86_PAGE_SIZE * 2);
969	for (cbStart = cbTemplate, cbEnd = 0; cbStart > 0; cbStart--, cbEnd++)
970	{
971	pbPage2[X86_PAGE_SIZE - cbStart - 1] = 0xf1;
972	Bs3MemCpy(&pbPage2[X86_PAGE_SIZE - cbStart], pvTemplate, cbStart);
973	Bs3MemCpy(pbPage1, &((uint8_t const *)pvTemplate)[cbStart], cbEnd);
974	pbPage1[cbEnd] = 0x0f; /* ud2 */
975	pbPage1[cbEnd + 1] = 0x0b;
976
977	Ctx.rip.u = UINT64_MAX - cbStart + 1;
978	TrapExpect.Ctx.rip.u = cbEnd;
979
980	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
981	if (bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
982	return 1;
983	g_usBs3TestStep++;
984
985	/* Also check that crossing 4G isn't buggered up in our code by
986	32-bit and 16-bit mode support.*/
987	Ctx.rip.u = _4G - cbStart;
988	TrapExpect.Ctx.rip.u = _4G + cbEnd;
989	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
990	if (bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
991	return 1;
992	g_usBs3TestStep++;
993
994	Ctx.rip.u = _4G*2 - cbStart;
995	TrapExpect.Ctx.rip.u = _4G*2 + cbEnd;
996	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
997	if (bs3CpuWeird1_ComparePcWrap(&TrapCtx, &TrapExpect))
998	return 1;
999	g_usBs3TestStep += 2;
1000	}
1001	return 0;
1002	}
1003
1004
1005
1006	BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3CpuWeird1_PcWrapping)(uint8_t bMode)
1007	{
1008	uint8_t bRet = 1;
1009	size_t i;
1010
1011	bs3CpuWeird1_SetGlobals(bMode);
1012
1013	if (BS3_MODE_IS_16BIT_CODE(bMode))
1014	{
1015	/*
1016	* For 16-bit testing, we need a 68 KB buffer.
1017	*
1018	* This is a little annoying to work with from 16-bit bit, so we use
1019	* separate pointers to each interesting bit of it.
1020	*/
1021	/** @todo add api for doing this, so we don't need to include bs3-cmn-memory.h. */
1022	uint8_t BS3_FAR pbBuf = (uint8_t BS3_FAR )Bs3SlabAllocEx(&g_Bs3Mem4KLow.Core, 17 /cPages/, 0 /fFlags/);
1023	if (pbBuf != NULL)
1024	{
1025	uint32_t const uFlatBuf = Bs3SelPtrToFlat(pbBuf);
1026	uint8_t BS3_FAR *pbTail = Bs3XptrFlatToCurrent(uFlatBuf + 0x0f000);
1027	uint8_t BS3_FAR *pbAfter = Bs3XptrFlatToCurrent(uFlatBuf + UINT32_C(0x10000));
1028	RTSEL SelCode;
1029	uint32_t off;
1030	static struct { FPFNBS3FAR pfnStart, pfnEnd; PCWRAPSETUP enmSetup; unsigned fNoV86 : 1; }
1031	const s_aTemplates16[] =
1032	{
1033	#define ENTRY16(a_Template, a_enmSetup, a_fNoV86) { a_Template ## _c16, a_Template ## _c16_EndProc, a_enmSetup, a_fNoV86 }
1034	ENTRY16(bs3CpuWeird1_PcWrapBenign1, kPcWrapSetup_None, 0),
1035	ENTRY16(bs3CpuWeird1_PcWrapBenign2, kPcWrapSetup_None, 0),
1036	ENTRY16(bs3CpuWeird1_PcWrapCpuId, kPcWrapSetup_ZeroRax, 0),
1037	ENTRY16(bs3CpuWeird1_PcWrapIn80, kPcWrapSetup_None, 0),
1038	ENTRY16(bs3CpuWeird1_PcWrapOut80, kPcWrapSetup_None, 0),
1039	ENTRY16(bs3CpuWeird1_PcWrapSmsw, kPcWrapSetup_None, 0),
1040	ENTRY16(bs3CpuWeird1_PcWrapRdCr0, kPcWrapSetup_None, 1),
1041	ENTRY16(bs3CpuWeird1_PcWrapRdDr0, kPcWrapSetup_None, 1),
1042	ENTRY16(bs3CpuWeird1_PcWrapWrDr0, kPcWrapSetup_ZeroRax, 1),
1043	#undef ENTRY16
1044	};
1045
1046	/* Fill the buffer with int1 instructions: */
1047	for (off = 0; off < UINT32_C(0x11000); off += _4K)
1048	{
1049	uint8_t BS3_FAR *pbPage = Bs3XptrFlatToCurrent(uFlatBuf + off);
1050	Bs3MemSet(pbPage, 0xf1, _4K);
1051	}
1052
1053	/* Setup the CS for it. */
1054	SelCode = (uint16_t)(uFlatBuf >> 4);
1055	if (!BS3_MODE_IS_RM_OR_V86(bMode))
1056	{
1057	Bs3SelSetup16BitCode(&Bs3GdteSpare00, uFlatBuf, 0);
1058	SelCode = BS3_SEL_SPARE_00;
1059	}
1060
1061	/* Allow IN and OUT to port 80h from V8086 mode. */
1062	if (BS3_MODE_IS_V86(bMode))
1063	{
1064	Bs3RegSetTr(BS3_SEL_TSS32_IOBP_IRB);
1065	ASMBitClear(Bs3SharedIobp, 0x80);
1066	}
1067
1068	for (i = 0; i < RT_ELEMENTS(s_aTemplates16); i++)
1069	{
1070	if (!s_aTemplates16[i].fNoV86 \|\| !BS3_MODE_IS_V86(bMode))
1071	bs3CpuWeird1_PcWrapping_Worker16(bMode, SelCode, pbBuf, pbTail, pbAfter, s_aTemplates16[i].pfnStart,
1072	(uintptr_t)s_aTemplates16[i].pfnEnd - (uintptr_t)s_aTemplates16[i].pfnStart,
1073	s_aTemplates16[i].enmSetup);
1074	g_usBs3TestStep = i * 256;
1075	}
1076
1077	if (BS3_MODE_IS_V86(bMode))
1078	ASMBitSet(Bs3SharedIobp, 0x80);
1079
1080	Bs3SlabFree(&g_Bs3Mem4KLow.Core, uFlatBuf, 17);
1081
1082	bRet = 0;
1083	}
1084	else
1085	Bs3TestFailed("Failed to allocate 17 pages (68KB)");
1086	}
1087	else
1088	{
1089	/*
1090	* For 32-bit and 64-bit mode we just need two pages.
1091	*/
1092	size_t const cbBuf = X86_PAGE_SIZE * 2;
1093	uint8_t BS3_FAR pbBuf = (uint8_t BS3_FAR )Bs3MemAlloc(BS3MEMKIND_TILED, cbBuf);
1094	if (pbBuf)
1095	{
1096	uint32_t const uFlatBuf = Bs3SelPtrToFlat(pbBuf);
1097	Bs3MemSet(pbBuf, 0xf1, cbBuf);
1098
1099	/*
1100	* For 32-bit we set up a CS that starts with the 2nd page and
1101	* ends with the first.
1102	*/
1103	if (BS3_MODE_IS_32BIT_CODE(bMode))
1104	{
1105	static struct { FPFNBS3FAR pfnStart, pfnEnd; PCWRAPSETUP enmSetup; } const s_aTemplates32[] =
1106	{
1107	#define ENTRY32(a_Template, a_enmSetup) { a_Template ## _c32, a_Template ## _c32_EndProc, a_enmSetup }
1108	ENTRY32(bs3CpuWeird1_PcWrapBenign1, kPcWrapSetup_None),
1109	ENTRY32(bs3CpuWeird1_PcWrapBenign2, kPcWrapSetup_None),
1110	ENTRY32(bs3CpuWeird1_PcWrapCpuId, kPcWrapSetup_ZeroRax),
1111	ENTRY32(bs3CpuWeird1_PcWrapIn80, kPcWrapSetup_None),
1112	ENTRY32(bs3CpuWeird1_PcWrapOut80, kPcWrapSetup_None),
1113	ENTRY32(bs3CpuWeird1_PcWrapSmsw, kPcWrapSetup_None),
1114	ENTRY32(bs3CpuWeird1_PcWrapRdCr0, kPcWrapSetup_None),
1115	ENTRY32(bs3CpuWeird1_PcWrapRdDr0, kPcWrapSetup_None),
1116	ENTRY32(bs3CpuWeird1_PcWrapWrDr0, kPcWrapSetup_ZeroRax),
1117	#undef ENTRY32
1118	};
1119
1120	Bs3SelSetup32BitCode(&Bs3GdteSpare00, uFlatBuf + X86_PAGE_SIZE, UINT32_MAX, 0);
1121
1122	for (i = 0; i < RT_ELEMENTS(s_aTemplates32); i++)
1123	{
1124	//Bs3TestPrintf("pfnStart=%p pfnEnd=%p\n", s_aTemplates32[i].pfnStart, s_aTemplates32[i].pfnEnd);
1125	bs3CpuWeird1_PcWrapping_Worker32(bMode, BS3_SEL_SPARE_00, pbBuf, &pbBuf[X86_PAGE_SIZE],
1126	uFlatBuf + X86_PAGE_SIZE, Bs3SelLnkPtrToCurPtr(s_aTemplates32[i].pfnStart),
1127	(uintptr_t)s_aTemplates32[i].pfnEnd - (uintptr_t)s_aTemplates32[i].pfnStart,
1128	s_aTemplates32[i].enmSetup);
1129	g_usBs3TestStep = i * 256;
1130	}
1131
1132	bRet = 0;
1133	}
1134	/*
1135	* For 64-bit we have to alias the two buffer pages to the first and
1136	* last page in the address space. To test that the 32-bit 4G rollover
1137	* isn't incorrectly applied to LM64, we repeat this mapping for the
1138	* 4G and 8G boundaries too.
1139	*
1140	* This ASSUMES there is nothing important in page 0 when in LM64.
1141	*/
1142	else
1143	{
1144	static const struct { uint64_t uDst; uint16_t off; } s_aMappings[] =
1145	{
1146	{ UINT64_MAX - X86_PAGE_SIZE + 1, X86_PAGE_SIZE * 1 },
1147	{ UINT64_C(0), X86_PAGE_SIZE * 0 },
1148	#if 1 /* technically not required as we just repeat the same 4G address space in long mode: */
1149	{ _4G - X86_PAGE_SIZE, X86_PAGE_SIZE * 1 },
1150	{ _4G, X86_PAGE_SIZE * 0 },
1151	{ _4G2 - X86_PAGE_SIZE, X86_PAGE_SIZE 1 },
1152	{ _4G2, X86_PAGE_SIZE 0 },
1153	#endif
1154	};
1155	int rc = VINF_SUCCESS;
1156	unsigned iMap;
1157	BS3_ASSERT(bMode == BS3_MODE_LM64);
1158	for (iMap = 0; iMap < RT_ELEMENTS(s_aMappings) && RT_SUCCESS(rc); iMap++)
1159	{
1160	rc = Bs3PagingAlias(s_aMappings[iMap].uDst, uFlatBuf + s_aMappings[iMap].off, X86_PAGE_SIZE,
1161	X86_PTE_P \| X86_PTE_A \| X86_PTE_D \| X86_PTE_RW);
1162	if (RT_FAILURE(rc))
1163	Bs3TestFailedF("Bs3PagingAlias(%#RX64,...) failed: %d", s_aMappings[iMap].uDst, rc);
1164	}
1165
1166	if (RT_SUCCESS(rc))
1167	{
1168	static struct { FPFNBS3FAR pfnStart, pfnEnd; PCWRAPSETUP enmSetup; } const s_aTemplates64[] =
1169	{
1170	#define ENTRY64(a_Template, a_enmSetup) { a_Template ## _c64, a_Template ## _c64_EndProc, a_enmSetup }
1171	ENTRY64(bs3CpuWeird1_PcWrapBenign1, kPcWrapSetup_None),
1172	ENTRY64(bs3CpuWeird1_PcWrapBenign2, kPcWrapSetup_None),
1173	ENTRY64(bs3CpuWeird1_PcWrapCpuId, kPcWrapSetup_ZeroRax),
1174	ENTRY64(bs3CpuWeird1_PcWrapIn80, kPcWrapSetup_None),
1175	ENTRY64(bs3CpuWeird1_PcWrapOut80, kPcWrapSetup_None),
1176	ENTRY64(bs3CpuWeird1_PcWrapSmsw, kPcWrapSetup_None),
1177	ENTRY64(bs3CpuWeird1_PcWrapRdCr0, kPcWrapSetup_None),
1178	ENTRY64(bs3CpuWeird1_PcWrapRdDr0, kPcWrapSetup_None),
1179	ENTRY64(bs3CpuWeird1_PcWrapWrDr0, kPcWrapSetup_ZeroRax),
1180	#undef ENTRY64
1181	};
1182
1183	for (i = 0; i < RT_ELEMENTS(s_aTemplates64); i++)
1184	{
1185	bs3CpuWeird1_PcWrapping_Worker64(bMode, pbBuf, uFlatBuf,
1186	Bs3SelLnkPtrToCurPtr(s_aTemplates64[i].pfnStart),
1187	(uintptr_t)s_aTemplates64[i].pfnEnd
1188	- (uintptr_t)s_aTemplates64[i].pfnStart,
1189	s_aTemplates64[i].enmSetup);
1190	g_usBs3TestStep = i * 256;
1191	}
1192
1193	bRet = 0;
1194
1195	Bs3PagingUnalias(UINT64_C(0), X86_PAGE_SIZE);
1196	}
1197
1198	while (iMap-- > 0)
1199	Bs3PagingUnalias(s_aMappings[iMap].uDst, X86_PAGE_SIZE);
1200	}
1201	Bs3MemFree(pbBuf, cbBuf);
1202	}
1203	else
1204	Bs3TestFailed("Failed to allocate 2-3 pages for tests.");
1205	}
1206
1207	return bRet;
1208	}
1209
1210
1211	/*********************************************************************************************************************************
1212	* PUSH / POP *
1213	*********************************************************************************************************************************/
1214	PROTO_ALL(bs3CpuWeird1_Push_xSP_Ud2);
1215	PROTO_ALL(bs3CpuWeird1_Push_opsize_xSP_Ud2);
1216	PROTO_ALL(bs3CpuWeird1_Push_opsize_xBX_Ud2);
1217	PROTO_ALL(bs3CpuWeird1_Pop_xSP_Ud2);
1218	PROTO_ALL(bs3CpuWeird1_Pop_opsize_xSP_Ud2);
1219	PROTO_ALL(bs3CpuWeird1_Pop_opsize_xBX_Ud2);
1220
1221
1222	/**
1223	* Compares push/pop result.
1224	*/
1225	static uint8_t bs3CpuWeird1_ComparePushPop(PCBS3TRAPFRAME pTrapCtx, PCBS3TRAPFRAME pTrapExpect)
1226	{
1227	uint16_t const cErrorsBefore = Bs3TestSubErrorCount();
1228	CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, pTrapExpect->bXcpt);
1229	CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, pTrapExpect->uErrCd);
1230	Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, &pTrapExpect->Ctx, 0 /cbPcAdjust/, 0 /cbSpAdjust/, 0 /fExtraEfl/,
1231	g_pszTestMode, g_usBs3TestStep);
1232	if (Bs3TestSubErrorCount() != cErrorsBefore)
1233	{
1234	Bs3TrapPrintFrame(pTrapCtx);
1235	Bs3TestPrintf("CS=%04RX16 SS:ESP=%04RX16:%08RX64 EFL=%RX64 cbIret=%#x\n",
1236	pTrapCtx->uHandlerCs, pTrapCtx->uHandlerSs, pTrapCtx->uHandlerRsp,
1237	pTrapCtx->fHandlerRfl, pTrapCtx->cbIretFrame);
1238	#if 0
1239	Bs3TestPrintf("Halting in ComparePushPop: bXcpt=%#x\n", pTrapCtx->bXcpt);
1240	ASMHalt();
1241	#endif
1242	return 1;
1243	}
1244	return 0;
1245	}
1246
1247
1248	/** Initialize the stack around the CS:RSP with fixed values. */
1249	static void bs3CpuWeird1_PushPopInitStack(BS3PTRUNION PtrStack)
1250	{
1251	PtrStack.pu16[-8] = UINT16_C(0x1e0f);
1252	PtrStack.pu16[-7] = UINT16_C(0x3c2d);
1253	PtrStack.pu16[-6] = UINT16_C(0x5a4b);
1254	PtrStack.pu16[-5] = UINT16_C(0x7869);
1255	PtrStack.pu16[-4] = UINT16_C(0x9687);
1256	PtrStack.pu16[-3] = UINT16_C(0xb4a5);
1257	PtrStack.pu16[-2] = UINT16_C(0xd2c3);
1258	PtrStack.pu16[-1] = UINT16_C(0xf0e1);
1259	PtrStack.pu16[0] = UINT16_C(0xfdec);
1260	PtrStack.pu16[1] = UINT16_C(0xdbca);
1261	PtrStack.pu16[2] = UINT16_C(0xb9a8);
1262	PtrStack.pu16[3] = UINT16_C(0x9786);
1263	PtrStack.pu16[4] = UINT16_C(0x7564);
1264	PtrStack.pu16[5] = UINT16_C(0x5342);
1265	PtrStack.pu16[6] = UINT16_C(0x3120);
1266	}
1267
1268
1269	BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3CpuWeird1_PushPop)(uint8_t bTestMode)
1270	{
1271	static struct
1272	{
1273	FPFNBS3FAR pfnStart;
1274	uint8_t cBits;
1275	bool fPush; /*< true if push, false if pop. /
1276	int8_t cbAdjSp; /*< The SP adjustment value. /
1277	uint8_t idxReg; /*< The X86_GREG_xXX value of the register in question. /
1278	uint8_t offUd2; /*< The UD2 offset into the code. /
1279	} s_aTests[] =
1280	{
1281	{ bs3CpuWeird1_Push_opsize_xBX_Ud2_c16, 16, true, -4, X86_GREG_xBX, 2 },
1282	{ bs3CpuWeird1_Pop_opsize_xBX_Ud2_c16, 16, false, +4, X86_GREG_xBX, 2 },
1283	{ bs3CpuWeird1_Push_xSP_Ud2_c16, 16, true, -2, X86_GREG_xSP, 1 },
1284	{ bs3CpuWeird1_Push_opsize_xSP_Ud2_c16, 16, true, -4, X86_GREG_xSP, 2 },
1285	{ bs3CpuWeird1_Pop_xSP_Ud2_c16, 16, false, +2, X86_GREG_xSP, 1 },
1286	{ bs3CpuWeird1_Pop_opsize_xSP_Ud2_c16, 16, false, +4, X86_GREG_xSP, 2 },
1287
1288	{ bs3CpuWeird1_Push_opsize_xBX_Ud2_c32, 32, true, -2, X86_GREG_xBX, 2 },
1289	{ bs3CpuWeird1_Pop_opsize_xBX_Ud2_c32, 32, false, +2, X86_GREG_xBX, 2 },
1290	{ bs3CpuWeird1_Push_xSP_Ud2_c32, 32, true, -4, X86_GREG_xSP, 1 },
1291	{ bs3CpuWeird1_Push_opsize_xSP_Ud2_c32, 32, true, -2, X86_GREG_xSP, 2 },
1292	{ bs3CpuWeird1_Pop_xSP_Ud2_c32, 32, false, +4, X86_GREG_xSP, 1 },
1293	{ bs3CpuWeird1_Pop_opsize_xSP_Ud2_c32, 32, false, +2, X86_GREG_xSP, 2 },
1294
1295	{ bs3CpuWeird1_Push_opsize_xBX_Ud2_c64, 64, true, -2, X86_GREG_xBX, 2 },
1296	{ bs3CpuWeird1_Pop_opsize_xBX_Ud2_c64, 64, false, +2, X86_GREG_xBX, 2 },
1297	{ bs3CpuWeird1_Push_xSP_Ud2_c64, 64, true, -8, X86_GREG_xSP, 1 },
1298	{ bs3CpuWeird1_Push_opsize_xSP_Ud2_c64, 64, true, -2, X86_GREG_xSP, 2 },
1299	{ bs3CpuWeird1_Pop_xSP_Ud2_c64, 64, false, +8, X86_GREG_xSP, 1 },
1300	{ bs3CpuWeird1_Pop_opsize_xSP_Ud2_c64, 64, false, +2, X86_GREG_xSP, 2 },
1301	};
1302	BS3TRAPFRAME TrapCtx;
1303	BS3TRAPFRAME TrapExpect;
1304	BS3REGCTX Ctx;
1305	uint8_t const cTestBits = BS3_MODE_IS_16BIT_CODE(bTestMode) ? 16
1306	: BS3_MODE_IS_32BIT_CODE(bTestMode) ? 32 : 64;
1307	uint8_t BS3_FAR *pbAltStack = NULL;
1308	BS3PTRUNION PtrStack;
1309	unsigned i;
1310
1311	/* make sure they're allocated */
1312	Bs3MemZero(&Ctx, sizeof(Ctx));
1313	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
1314	Bs3MemZero(&TrapExpect, sizeof(TrapExpect));
1315
1316	bs3CpuWeird1_SetGlobals(bTestMode);
1317
1318	/* Construct a basic context. */
1319	Bs3RegCtxSaveEx(&Ctx, bTestMode, 1024);
1320	Ctx.rflags.u32 &= ~X86_EFL_RF;
1321	if (BS3_MODE_IS_64BIT_CODE(bTestMode))
1322	{
1323	Ctx.rbx.au32[1] ^= UINT32_C(0x12305c78);
1324	Ctx.rcx.au32[1] ^= UINT32_C(0x33447799);
1325	Ctx.rax.au32[1] ^= UINT32_C(0x9983658a);
1326	Ctx.r11.au32[1] ^= UINT32_C(0xbbeeffdd);
1327	Ctx.r12.au32[1] ^= UINT32_C(0x87272728);
1328	}
1329
1330	/* ring-3 if possible, since that'll enable automatic stack switching. */
1331	if (!BS3_MODE_IS_RM_OR_V86(bTestMode))
1332	Bs3RegCtxConvertToRingX(&Ctx, 3);
1333
1334	/* Make PtrStack == SS:xSP from Ctx. */
1335	PtrStack.pv = Bs3RegCtxGetRspSsAsCurPtr(&Ctx);
1336
1337	#if 1
1338	/* Use our own stack so we can observe the effect of ESP/RSP rolling across
1339	a 64KB boundrary when just popping SP. */
1340	if (!BS3_MODE_IS_16BIT_CODE(bTestMode)) /** @todo extend this to 16-bit code as well (except RM ofc). */
1341	{
1342	uint32_t uFlatNextSeg;
1343	pbAltStack = (uint8_t BS3_FAR )Bs3SlabAllocEx(&g_Bs3Mem4KUpperTiled.Core, 17 /cPages/, 0 /fFlags*/);
1344	if (!pbAltStack)
1345	{
1346	Bs3TestFailed("Failed to allocate 68K for alternative stack!");
1347	return 1;
1348	}
1349
1350	/* Modify RSP to be one byte under the 64KB boundrary. */
1351	uFlatNextSeg = (Bs3SelPtrToFlat(pbAltStack) + _64K) & ~UINT32_C(0xffff);
1352	Ctx.rsp.u = uFlatNextSeg - 1;
1353	//Bs3TestPrintf("uFlatNextSeg=%RX32 rsp=%RX64 ss=%RX16\n", uFlatNextSeg, Ctx.rsp.u, Ctx.ss);
1354
1355	/* Modify the PtrStack accordingly, using a spare selector for addressing it. */
1356	Bs3SelSetup16BitData(&Bs3GdteSpare00, uFlatNextSeg - _4K);
1357	PtrStack.pv = BS3_FP_MAKE(BS3_SEL_SPARE_00 \| 3, _4K - 1);
1358	}
1359	#endif
1360
1361	/*
1362	* Iterate the test snippets and run those relevant to the test context.
1363	*/
1364	for (i = 0; i < RT_ELEMENTS(s_aTests); i++)
1365	{
1366	if (s_aTests[i].cBits == cTestBits)
1367	{
1368	PBS3REG const pReg = &(&Ctx.rax)[s_aTests[i].idxReg];
1369	unsigned iRep; /*< This is to trigger native recompilation. /
1370	BS3REG SavedReg;
1371	BS3REG SavedRsp;
1372
1373	/* Save context stuff we may change: */
1374	SavedReg.u = pReg->u;
1375	SavedRsp.u = Ctx.rsp.u;
1376
1377	/* Setup the test context. */
1378	Bs3RegCtxSetRipCsFromLnkPtr(&Ctx, s_aTests[i].pfnStart);
1379	if (BS3_MODE_IS_16BIT_SYS(bTestMode))
1380	g_uBs3TrapEipHint = Ctx.rip.u32;
1381
1382	if (BS3_MODE_IS_16BIT_CODE(bTestMode))
1383	Ctx.rsp.u32 \|= UINT32_C(0x34560000); /* This part should be ignored, as the stack is also 16-bit. */
1384
1385	/* The basic expected trap context. */
1386	TrapExpect.bXcpt = X86_XCPT_UD;
1387	Bs3MemCpy(&TrapExpect.Ctx, &Ctx, sizeof(TrapExpect.Ctx));
1388	TrapExpect.Ctx.rsp.u += s_aTests[i].cbAdjSp;
1389	TrapExpect.Ctx.rip.u += s_aTests[i].offUd2;
1390	if (!BS3_MODE_IS_16BIT_SYS(bTestMode))
1391	TrapExpect.Ctx.rflags.u32 \|= X86_EFL_RF;
1392
1393	g_usBs3TestStep = i;
1394
1395	if (s_aTests[i].cbAdjSp < 0)
1396	{
1397	/*
1398	* PUSH
1399	*/
1400	RTUINT64U u64ExpectPushed;
1401	BS3PTRUNION PtrStack2;
1402	PtrStack2.pb = PtrStack.pb + s_aTests[i].cbAdjSp;
1403
1404	bs3CpuWeird1_PushPopInitStack(PtrStack);
1405	u64ExpectPushed.u = *PtrStack2.pu64;
1406	switch (s_aTests[i].cbAdjSp)
1407	{
1408	case -2: u64ExpectPushed.au16[0] = pReg->au16[0]; break;
1409	case -4: u64ExpectPushed.au32[0] = pReg->au32[0]; break;
1410	case -8: u64ExpectPushed.au64[0] = pReg->u; break;
1411	}
1412
1413	for (iRep = 0; iRep < 256; iRep++)
1414	{
1415	bs3CpuWeird1_PushPopInitStack(PtrStack);
1416	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
1417	if (bs3CpuWeird1_ComparePushPop(&TrapCtx, &TrapExpect))
1418	break;
1419	if (*PtrStack2.pu64 != u64ExpectPushed.u)
1420	{
1421	Bs3TestFailedF("%u - Unexpected stack value after push: %RX64, expected %RX64",
1422	g_usBs3TestStep, *PtrStack2.pu64, u64ExpectPushed);
1423	break;
1424	}
1425	}
1426	}
1427	else
1428	{
1429	/*
1430	* POP.
1431	*
1432	* This is where it gets interesting. When popping a partial
1433	* SP and the upper part also changes, this is preserved. I.e.
1434	* the CPU first writes the updated RSP then the register or
1435	* register part that it popped.
1436	*/
1437	PBS3REG const pExpectReg = &(&TrapExpect.Ctx.rax)[s_aTests[i].idxReg];
1438	RTUINT64U u64PopValue;
1439
1440	bs3CpuWeird1_PushPopInitStack(PtrStack);
1441	u64PopValue.u = *PtrStack.pu64;
1442	if (bTestMode != BS3_MODE_RM)
1443	{
1444	/* When in ring-3 we can put whatever we want on the stack, as the UD2 will cause a stack switch. */
1445	switch (s_aTests[i].cbAdjSp)
1446	{
1447	case 2: u64PopValue.au16[0] = ~pReg->au16[0] ^ UINT16_C(0xf394); break;
1448	case 4: u64PopValue.au32[0] = ~pReg->au32[0] ^ UINT32_C(0x9e501ab3); break;
1449	case 8: u64PopValue.au64[0] = ~pReg->u ^ UINT64_C(0xbf5fedd520fe9a45); break;
1450	}
1451	}
1452	else
1453	{
1454	/* In real mode we have to be a little more careful. */
1455	if (s_aTests[i].cbAdjSp == 2)
1456	u64PopValue.au16[0] = pReg->au16[0] - 382;
1457	else
1458	{
1459	u64PopValue.au16[0] = pReg->au16[0] - 258;
1460	u64PopValue.au16[1] = ~pReg->au16[1];
1461	}
1462	}
1463
1464	switch (s_aTests[i].cbAdjSp)
1465	{
1466	case 2:
1467	pExpectReg->au16[0] = u64PopValue.au16[0];
1468	break;
1469	case 4:
1470	pExpectReg->au32[0] = u64PopValue.au32[0];
1471	pExpectReg->au32[1] = 0;
1472	break;
1473	case 8:
1474	pExpectReg->u = u64PopValue.u;
1475	break;
1476	}
1477	//Bs3TestPrintf("iTest=%u/%d: %RX64 -> %RX64\n", i, s_aTests[i].cbAdjSp, pReg->u, pExpectReg->u);
1478
1479	for (iRep = 0; iRep < 256; iRep++)
1480	{
1481	bs3CpuWeird1_PushPopInitStack(PtrStack);
1482	*PtrStack.pu64 = u64PopValue.u;
1483	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
1484	if (bs3CpuWeird1_ComparePushPop(&TrapCtx, &TrapExpect))
1485	break;
1486	}
1487	}
1488
1489	/* Restore context (except cs:rsp): */
1490	pReg->u = SavedReg.u;
1491	Ctx.rsp.u = SavedRsp.u;
1492	}
1493	}
1494
1495	if (pbAltStack)
1496	Bs3SlabFree(&g_Bs3Mem4KUpperTiled.Core, Bs3SelPtrToFlat(pbAltStack), 17);
1497
1498	return 0;
1499	}
1500
1501
1502
1503	/*********************************************************************************************************************************
1504	* PUSH SREG / POP SREG *
1505	*********************************************************************************************************************************/
1506	PROTO_ALL(bs3CpuWeird1_Push_cs_Ud2);
1507	PROTO_ALL(bs3CpuWeird1_Push_ss_Ud2);
1508	PROTO_ALL(bs3CpuWeird1_Push_ds_Ud2);
1509	PROTO_ALL(bs3CpuWeird1_Push_es_Ud2);
1510	PROTO_ALL(bs3CpuWeird1_Push_fs_Ud2);
1511	PROTO_ALL(bs3CpuWeird1_Push_gs_Ud2);
1512	PROTO_ALL(bs3CpuWeird1_Pop_ss_Ud2);
1513	PROTO_ALL(bs3CpuWeird1_Pop_ds_Ud2);
1514	PROTO_ALL(bs3CpuWeird1_Pop_es_Ud2);
1515	PROTO_ALL(bs3CpuWeird1_Pop_fs_Ud2);
1516	PROTO_ALL(bs3CpuWeird1_Pop_gs_Ud2);
1517	PROTO_ALL(bs3CpuWeird1_Push_opsize_cs_Ud2);
1518	PROTO_ALL(bs3CpuWeird1_Push_opsize_ss_Ud2);
1519	PROTO_ALL(bs3CpuWeird1_Push_opsize_ds_Ud2);
1520	PROTO_ALL(bs3CpuWeird1_Push_opsize_es_Ud2);
1521	PROTO_ALL(bs3CpuWeird1_Push_opsize_fs_Ud2);
1522	PROTO_ALL(bs3CpuWeird1_Push_opsize_gs_Ud2);
1523	PROTO_ALL(bs3CpuWeird1_Pop_opsize_ss_Ud2);
1524	PROTO_ALL(bs3CpuWeird1_Pop_opsize_ds_Ud2);
1525	PROTO_ALL(bs3CpuWeird1_Pop_opsize_es_Ud2);
1526	PROTO_ALL(bs3CpuWeird1_Pop_opsize_fs_Ud2);
1527	PROTO_ALL(bs3CpuWeird1_Pop_opsize_gs_Ud2);
1528
1529
1530	BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3CpuWeird1_PushPopSReg)(uint8_t bTestMode)
1531	{
1532	static struct
1533	{
1534	FPFNBS3FAR pfnStart;
1535	uint8_t cBits;
1536	bool fPush; /*< true if push, false if pop. /
1537	int8_t cbAdjSp; /*< The SP adjustment value. /
1538	uint8_t offReg; /*< The offset of the register in BS3REGCTX. /
1539	uint8_t offUd2; /*< The UD2 offset into the code. /
1540	} s_aTests[] =
1541	{
1542	{ bs3CpuWeird1_Push_cs_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, cs), 1 },
1543	{ bs3CpuWeird1_Push_ss_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, ss), 1 },
1544	{ bs3CpuWeird1_Push_ds_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, ds), 1 },
1545	{ bs3CpuWeird1_Push_es_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, es), 1 },
1546	{ bs3CpuWeird1_Push_fs_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1547	{ bs3CpuWeird1_Push_gs_Ud2_c16, 16, true, -2, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1548	{ bs3CpuWeird1_Pop_ss_Ud2_c16, 16, false, +2, RT_UOFFSETOF(BS3REGCTX, ss), 1 },
1549	{ bs3CpuWeird1_Pop_ds_Ud2_c16, 16, false, +2, RT_UOFFSETOF(BS3REGCTX, ds), 1 },
1550	{ bs3CpuWeird1_Pop_es_Ud2_c16, 16, false, +2, RT_UOFFSETOF(BS3REGCTX, es), 1 },
1551	{ bs3CpuWeird1_Pop_fs_Ud2_c16, 16, false, +2, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1552	{ bs3CpuWeird1_Pop_gs_Ud2_c16, 16, false, +2, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1553	{ bs3CpuWeird1_Push_opsize_cs_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, cs), 2 },
1554	{ bs3CpuWeird1_Push_opsize_ss_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, ss), 2 },
1555	{ bs3CpuWeird1_Push_opsize_ds_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, ds), 2 },
1556	{ bs3CpuWeird1_Push_opsize_es_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, es), 2 },
1557	{ bs3CpuWeird1_Push_opsize_fs_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1558	{ bs3CpuWeird1_Push_opsize_gs_Ud2_c16, 16, true, -4, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1559	{ bs3CpuWeird1_Pop_opsize_ss_Ud2_c16, 16, false, +4, RT_UOFFSETOF(BS3REGCTX, ss), 2 },
1560	{ bs3CpuWeird1_Pop_opsize_ds_Ud2_c16, 16, false, +4, RT_UOFFSETOF(BS3REGCTX, ds), 2 },
1561	{ bs3CpuWeird1_Pop_opsize_es_Ud2_c16, 16, false, +4, RT_UOFFSETOF(BS3REGCTX, es), 2 },
1562	{ bs3CpuWeird1_Pop_opsize_fs_Ud2_c16, 16, false, +4, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1563	{ bs3CpuWeird1_Pop_opsize_gs_Ud2_c16, 16, false, +4, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1564
1565	{ bs3CpuWeird1_Push_cs_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, cs), 1 },
1566	{ bs3CpuWeird1_Push_ss_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, ss), 1 },
1567	{ bs3CpuWeird1_Push_ds_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, ds), 1 },
1568	{ bs3CpuWeird1_Push_es_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, es), 1 },
1569	{ bs3CpuWeird1_Push_fs_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1570	{ bs3CpuWeird1_Push_gs_Ud2_c32, 32, true, -4, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1571	{ bs3CpuWeird1_Pop_ss_Ud2_c32, 32, false, +4, RT_UOFFSETOF(BS3REGCTX, ss), 1 },
1572	{ bs3CpuWeird1_Pop_ds_Ud2_c32, 32, false, +4, RT_UOFFSETOF(BS3REGCTX, ds), 1 },
1573	{ bs3CpuWeird1_Pop_es_Ud2_c32, 32, false, +4, RT_UOFFSETOF(BS3REGCTX, es), 1 },
1574	{ bs3CpuWeird1_Pop_fs_Ud2_c32, 32, false, +4, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1575	{ bs3CpuWeird1_Pop_gs_Ud2_c32, 32, false, +4, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1576	{ bs3CpuWeird1_Push_opsize_cs_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, cs), 2 },
1577	{ bs3CpuWeird1_Push_opsize_ss_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, ss), 2 },
1578	{ bs3CpuWeird1_Push_opsize_ds_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, ds), 2 },
1579	{ bs3CpuWeird1_Push_opsize_es_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, es), 2 },
1580	{ bs3CpuWeird1_Push_opsize_fs_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1581	{ bs3CpuWeird1_Push_opsize_gs_Ud2_c32, 32, true, -2, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1582	{ bs3CpuWeird1_Pop_opsize_ss_Ud2_c32, 32, false, +2, RT_UOFFSETOF(BS3REGCTX, ss), 2 },
1583	{ bs3CpuWeird1_Pop_opsize_ds_Ud2_c32, 32, false, +2, RT_UOFFSETOF(BS3REGCTX, ds), 2 },
1584	{ bs3CpuWeird1_Pop_opsize_es_Ud2_c32, 32, false, +2, RT_UOFFSETOF(BS3REGCTX, es), 2 },
1585	{ bs3CpuWeird1_Pop_opsize_fs_Ud2_c32, 32, false, +2, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1586	{ bs3CpuWeird1_Pop_opsize_gs_Ud2_c32, 32, false, +2, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1587
1588	{ bs3CpuWeird1_Push_fs_Ud2_c64, 64, true, -8, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1589	{ bs3CpuWeird1_Push_gs_Ud2_c64, 64, true, -8, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1590	{ bs3CpuWeird1_Pop_fs_Ud2_c64, 64, false, +8, RT_UOFFSETOF(BS3REGCTX, fs), 2 },
1591	{ bs3CpuWeird1_Pop_gs_Ud2_c64, 64, false, +8, RT_UOFFSETOF(BS3REGCTX, gs), 2 },
1592	{ bs3CpuWeird1_Push_opsize_fs_Ud2_c64, 64, true, -2, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1593	{ bs3CpuWeird1_Push_opsize_gs_Ud2_c64, 64, true, -2, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1594	{ bs3CpuWeird1_Pop_opsize_fs_Ud2_c64, 64, false, +2, RT_UOFFSETOF(BS3REGCTX, fs), 3 },
1595	{ bs3CpuWeird1_Pop_opsize_gs_Ud2_c64, 64, false, +2, RT_UOFFSETOF(BS3REGCTX, gs), 3 },
1596	};
1597	BS3TRAPFRAME TrapCtx;
1598	BS3TRAPFRAME TrapExpect;
1599	BS3REGCTX Ctx;
1600	uint16_t const uInitialSel = bTestMode != BS3_MODE_RM ? BS3_SEL_R3_DS16 : 0x8080;
1601	uint16_t const uPopSel = BS3_SEL_R3_SS16;
1602	bool const fFullWrite = BS3_MODE_IS_64BIT_CODE(bTestMode) /* 64-bit mode writes are full (10980XE). */
1603	\|\| (g_enmCpuVendor = Bs3GetCpuVendor()) != BS3CPUVENDOR_INTEL;
1604	bool const fFullRead = false /* But, 64-bit mode reads are word sized (10980XE). */
1605	\|\| g_enmCpuVendor != BS3CPUVENDOR_INTEL;
1606	bool const fInRmWrHiEfl = true /* 10890XE writes EFLAGS[31:16] in the high word of a 'o32 PUSH FS'. */
1607	&& !fFullWrite;
1608	uint8_t const cTestBits = BS3_MODE_IS_16BIT_CODE(bTestMode) ? 16
1609	: BS3_MODE_IS_32BIT_CODE(bTestMode) ? 32 : 64;
1610	unsigned const cbAltStack = 2 * X86_PAGE_SIZE;
1611	uint8_t BS3_FAR *pbAltStack = NULL;
1612	uint32_t uFlatAltStack;
1613	uint32_t uFlatAltStackAlias;
1614	BS3PTRUNION PtrStack;
1615	unsigned iVariation;
1616
1617	/* make sure they're allocated */
1618	Bs3MemZero(&Ctx, sizeof(Ctx));
1619	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
1620	Bs3MemZero(&TrapExpect, sizeof(TrapExpect));
1621
1622	bs3CpuWeird1_SetGlobals(bTestMode);
1623
1624	/* Construct a basic context. */
1625	Bs3RegCtxSaveEx(&Ctx, bTestMode, 1024);
1626	Ctx.rflags.u32 &= ~X86_EFL_RF;
1627	if (g_uBs3CpuDetected & BS3CPU_F_CPUID)
1628	Ctx.rflags.u32 \|= X86_EFL_ID; /* Make sure it's set as it bleeds in in real-mode on my intel 10890XE. */
1629
1630	if (BS3_MODE_IS_64BIT_CODE(bTestMode))
1631	{
1632	Ctx.rbx.au32[1] ^= UINT32_C(0x12305c78);
1633	Ctx.rcx.au32[1] ^= UINT32_C(0x33447799);
1634	Ctx.rax.au32[1] ^= UINT32_C(0x9983658a);
1635	Ctx.r11.au32[1] ^= UINT32_C(0xbbeeffdd);
1636	Ctx.r12.au32[1] ^= UINT32_C(0x87272728);
1637	}
1638
1639	/* ring-3 if possible, since that'll enable automatic stack switching. */
1640	if (!BS3_MODE_IS_RM_OR_V86(bTestMode))
1641	Bs3RegCtxConvertToRingX(&Ctx, 3);
1642
1643	/* Make PtrStack == SS:xSP from Ctx. */
1644	PtrStack.pv = Bs3RegCtxGetRspSsAsCurPtr(&Ctx);
1645
1646	/* Use our own stack so we can analyze the PUSH/POP FS behaviour using
1647	both the SS limit (except 64-bit code) and paging (when enabled).
1648	Two pages suffices here, but we allocate two more for aliasing the
1649	first to onto. */
1650	if (!BS3_MODE_IS_RM_OR_V86(bTestMode)) /** @todo test V86 mode w/ paging */
1651	{
1652	pbAltStack = (uint8_t BS3_FAR )Bs3MemAlloc(BS3MEMKIND_TILED, cbAltStack 2);
1653	if (!pbAltStack)
1654	return !Bs3TestFailed("Failed to allocate 2*2 pages for an alternative stack!");
1655	uFlatAltStack = Bs3SelPtrToFlat(pbAltStack);
1656	if (uFlatAltStack & X86_PAGE_OFFSET_MASK)
1657	return !Bs3TestFailedF("Misaligned allocation: %p / %RX32!", pbAltStack, uFlatAltStack);
1658	}
1659
1660	/*
1661	* The outer loop does setup variations:
1662	* - 0: Standard push and pop w/o off default stack w/o any restrictions.
1663	* - 1: Apply segment limit as tightly as possible w/o #SS.
1664	* - 2: Apply the segment limit too tight and field #SS.
1665	* - 3: Put the segment number right next to a page that's not present.
1666	* No segment trickery.
1667	* - 4: Make the segment number word straddle a page boundrary where
1668	* the 2nd page is not present.
1669	*/
1670	for (iVariation = 0; iVariation <= 4; iVariation++)
1671	{
1672	uint16_t const uSavedSs = Ctx.ss;
1673	uint64_t const uSavedRsp = Ctx.rsp.u;
1674	uint32_t uNominalEsp;
1675	unsigned iTest;
1676
1677	/* Skip variation if not supported by the test mode. */
1678	if (iVariation >= 1 && BS3_MODE_IS_RM_OR_V86(bTestMode)) /** @todo test V86 mode w/ paging */
1679	break;
1680
1681	if ((iVariation == 1 \|\| iVariation == 2) && BS3_MODE_IS_64BIT_CODE(bTestMode))
1682	continue;
1683	if ((iVariation == 3 \|\| iVariation == 4) && !BS3_MODE_IS_PAGED(bTestMode))
1684	continue;
1685
1686	uFlatAltStackAlias = uFlatAltStack;
1687	if (iVariation != 0)
1688	{
1689	/* Alias the two stack pages for variation #3 and #4 so we can keep
1690	accessing them via pbAltStack while testing. */
1691	if (iVariation == 3 \|\| iVariation == 4)
1692	{
1693	int rc = Bs3PagingAlias(uFlatAltStackAlias = uFlatAltStack + X86_PAGE_SIZE * 2, uFlatAltStack, X86_PAGE_SIZE,
1694	X86_PTE_P \| X86_PTE_RW \| X86_PTE_A \| X86_PTE_D \| X86_PTE_US);
1695	if (RT_SUCCESS(rc))
1696	{
1697	rc = Bs3PagingAlias(uFlatAltStackAlias + X86_PAGE_SIZE, uFlatAltStack + X86_PAGE_SIZE, X86_PAGE_SIZE, 0);
1698	if (RT_FAILURE(rc))
1699	{
1700	Bs3TestFailedF("Alias of 2nd stack page failed: %d", rc);
1701	Bs3PagingUnalias(uFlatAltStackAlias, X86_PAGE_SIZE);
1702	}
1703	}
1704	else
1705	Bs3TestFailedF("Alias of 2nd stack page failed: %d", rc);
1706	if (RT_FAILURE(rc))
1707	break;
1708	}
1709
1710	if (iVariation == 1 \|\| iVariation == 2 \|\| BS3_MODE_IS_16BIT_CODE(bTestMode))
1711	{
1712	/* Setup a 16-bit stack with two pages and ESP pointing at the last
1713	word in the first page. The SS limit is at 4KB for variation #1
1714	(shouldn't fault unless the CPU does full dword writes), one byte
1715	lower for variation #2 (must always fault), and max limit for
1716	variations #3 and #4. */
1717	Bs3SelSetup16BitData(&Bs3GdteSpare00, uFlatAltStackAlias);
1718	if (iVariation <= 2)
1719	{
1720	Bs3GdteSpare00.Gen.u16LimitLow = _4K - 1;
1721	if (iVariation == 2)
1722	Bs3GdteSpare00.Gen.u16LimitLow -= 1;
1723	Bs3GdteSpare00.Gen.u4LimitHigh = 0;
1724	}
1725	Ctx.ss = BS3_SEL_SPARE_00 \| 3;
1726	Ctx.rsp.u = _4K - sizeof(uint16_t);
1727	}
1728	else
1729	{
1730	/* Setup flat stack similar to above for variation #3 and #4. */
1731	Ctx.rsp.u = uFlatAltStackAlias + _4K - sizeof(uint16_t);
1732	}
1733
1734	/* Update the stack pointer to match the new ESP. */
1735	PtrStack.pv = &pbAltStack[_4K - sizeof(uint16_t)];
1736
1737	/* For variation #4 we move the stack position up by one byte so we'll
1738	always cross the page boundrary and hit the non-existing page. */
1739	if (iVariation == 4)
1740	{
1741	Ctx.rsp.u += 1;
1742	PtrStack.pb += 1;
1743	}
1744	}
1745	uNominalEsp = Ctx.rsp.u32;
1746	for (iTest = 0; iTest < RT_ELEMENTS(s_aTests); iTest++)
1747	{
1748	if (s_aTests[iTest].cBits == cTestBits)
1749	{
1750	uint16_t BS3_FAR pRegCtx = (uint16_t BS3_FAR )((uint8_t BS3_FAR *)&Ctx + s_aTests[iTest].offReg);
1751	uint16_t BS3_FAR pRegExpect = (uint16_t BS3_FAR )((uint8_t BS3_FAR *)&TrapExpect.Ctx + s_aTests[iTest].offReg);
1752	uint16_t const uSavedSel = *pRegCtx;
1753	uint8_t const cbItem = RT_ABS(s_aTests[iTest].cbAdjSp);
1754	bool const fDefaultSel = s_aTests[iTest].offReg == RT_UOFFSETOF(BS3REGCTX, ss)
1755	\|\| s_aTests[iTest].offReg == RT_UOFFSETOF(BS3REGCTX, cs);
1756	unsigned iRep; /*< This is to trigger native recompilation. /
1757	BS3PTRUNION PtrStack2;
1758
1759	if (!fDefaultSel)
1760	*pRegCtx = uInitialSel;
1761
1762	/* Calculate the stack read/write location for this test. PtrStack
1763	ASSUMES word writes, so we have to adjust it and RSP if the CPU
1764	does full read+writes. */
1765	PtrStack2.pv = PtrStack.pv;
1766	if (cbItem != 2 && (s_aTests[iTest].cbAdjSp < 0 ? fFullWrite : fFullRead))
1767	{
1768	PtrStack2.pb -= cbItem - 2;
1769	Ctx.rsp.u32 -= cbItem - 2;
1770	}
1771
1772	/* Setup the test context. */
1773	Bs3RegCtxSetRipCsFromLnkPtr(&Ctx, s_aTests[iTest].pfnStart);
1774	if (BS3_MODE_IS_16BIT_SYS(bTestMode))
1775	g_uBs3TrapEipHint = Ctx.rip.u32;
1776
1777	/* Use the same access location for both PUSH and POP instructions (PtrStack). */
1778	if (s_aTests[iTest].cbAdjSp < 0)
1779	Ctx.rsp.u16 += -s_aTests[iTest].cbAdjSp;
1780
1781	/* The basic expected trap context. */
1782	TrapExpect.bXcpt = iVariation == 2 ? X86_XCPT_SS : iVariation == 4 ? X86_XCPT_PF : X86_XCPT_UD;
1783	TrapExpect.uErrCd = 0;
1784	Bs3MemCpy(&TrapExpect.Ctx, &Ctx, sizeof(TrapExpect.Ctx));
1785	if (TrapExpect.bXcpt == X86_XCPT_UD)
1786	{
1787	TrapExpect.Ctx.rsp.u += s_aTests[iTest].cbAdjSp;
1788	TrapExpect.Ctx.rip.u += s_aTests[iTest].offUd2;
1789	}
1790	else if (iVariation == 4)
1791	{
1792	TrapExpect.uErrCd = s_aTests[iTest].cbAdjSp < 0 ? X86_TRAP_PF_RW \| X86_TRAP_PF_US : X86_TRAP_PF_US;
1793	TrapExpect.Ctx.cr2.u = uFlatAltStackAlias + X86_PAGE_SIZE;
1794	}
1795	if (!BS3_MODE_IS_16BIT_SYS(bTestMode))
1796	TrapExpect.Ctx.rflags.u32 \|= X86_EFL_RF;
1797
1798	g_usBs3TestStep = iVariation * 1000 + iTest;
1799
1800	if (s_aTests[iTest].cbAdjSp < 0)
1801	{
1802	#if 1
1803	/*
1804	* PUSH
1805	*/
1806	RTUINT64U u64ExpectPushed;
1807
1808	bs3CpuWeird1_PushPopInitStack(PtrStack2);
1809	u64ExpectPushed.u = *PtrStack2.pu64;
1810	if (TrapExpect.bXcpt == X86_XCPT_UD)
1811	{
1812	u64ExpectPushed.au16[0] = *pRegCtx;
1813	if (s_aTests[iTest].cbAdjSp < -2)
1814	{
1815	if (fFullWrite) /* enable for CPUs that writes more than a word */
1816	{
1817	u64ExpectPushed.au16[1] = 0;
1818	if (s_aTests[iTest].cbAdjSp == -8)
1819	u64ExpectPushed.au32[1] = 0;
1820	}
1821	/* Intel 10980XE real mode: high word appears to be from EFLAGS. Weird! */
1822	else if (bTestMode == BS3_MODE_RM && fInRmWrHiEfl)
1823	u64ExpectPushed.au16[1] = Ctx.rflags.au16[1];
1824	}
1825	}
1826
1827	for (iRep = 0; iRep < 256; iRep++)
1828	{
1829	if (iVariation < 3)
1830	bs3CpuWeird1_PushPopInitStack(PtrStack2);
1831	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
1832	if (bs3CpuWeird1_ComparePushPop(&TrapCtx, &TrapExpect))
1833	break;
1834
1835	if (*PtrStack2.pu64 != u64ExpectPushed.u)
1836	{
1837	Bs3TestFailedF("%u - Unexpected stack value after push: %RX64, expected %RX64",
1838	g_usBs3TestStep, *PtrStack2.pu64, u64ExpectPushed);
1839	break;
1840	}
1841	}
1842	#endif
1843	}
1844	else
1845	{
1846	#if 1
1847	/*
1848	* POP.
1849	*/
1850	if (TrapExpect.bXcpt == X86_XCPT_UD)
1851	pRegExpect = !fDefaultSel ? uPopSel : pRegCtx;
1852
1853	for (iRep = 0; iRep < 256; iRep++)
1854	{
1855	bs3CpuWeird1_PushPopInitStack(PtrStack2);
1856	PtrStack2.pu16 = !fDefaultSel ? uPopSel : pRegCtx;
1857	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
1858	if (bs3CpuWeird1_ComparePushPop(&TrapCtx, &TrapExpect))
1859	break;
1860	}
1861	#endif
1862	}
1863
1864	/* Restore context (except cs:rip): */
1865	*pRegCtx = uSavedSel;
1866	Ctx.rsp.u32 = uNominalEsp;
1867	}
1868	}
1869
1870	/* Restore original SS:RSP value. */
1871	Ctx.rsp.u = uSavedRsp;
1872	Ctx.ss = uSavedSs;
1873	}
1874
1875	if (pbAltStack)
1876	Bs3MemFree(pbAltStack, cbAltStack);
1877
1878	return 0;
1879	}
1880
1881
1882
1883	/*********************************************************************************************************************************
1884	* POPF *
1885	*********************************************************************************************************************************/
1886
1887	/**
1888	* Compares popf result.
1889	*/
1890	static uint8_t bs3CpuWeird1_ComparePopf(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pCtxExpect, uint8_t bXcpt)
1891	{
1892	uint16_t const cErrorsBefore = Bs3TestSubErrorCount();
1893	CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, bXcpt);
1894	CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, 0);
1895	Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, pCtxExpect, 0 /cbPcAdjust/, 0 /cbSpAdjust/, 0 /fExtraEfl/,
1896	g_pszTestMode, g_usBs3TestStep);
1897	if (Bs3TestSubErrorCount() != cErrorsBefore)
1898	{
1899	Bs3TrapPrintFrame(pTrapCtx);
1900	#if 0
1901	Bs3TestPrintf("Halting in ComparePopf: bXcpt=%#x\n", pTrapCtx->bXcpt);
1902	ASMHalt();
1903	#endif
1904	return 1;
1905	}
1906	return 0;
1907	}
1908
1909	PROTO_ALL(bs3CpuWeird1_Popf_Nop_Ud2);
1910	PROTO_ALL(bs3CpuWeird1_Popf_opsize_Nop_Ud2);
1911
1912	BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3CpuWeird1_Popf)(uint8_t bTestMode)
1913	{
1914	static struct
1915	{
1916	FPFNBS3FAR pfnStart;
1917	uint8_t cBits;
1918	int8_t cbAdjSp; /*< The SP adjustment value. /
1919	uint8_t offNop; /*< The NOP offset into the code. /
1920	uint8_t offUd2; /*< The UD2 offset into the code. /
1921	} const s_aTests[] =
1922	{
1923	{ bs3CpuWeird1_Popf_Nop_Ud2_c16, 16, 2, 1, 2 },
1924	{ bs3CpuWeird1_Popf_opsize_Nop_Ud2_c16, 16, 4, 2, 3 },
1925
1926	{ bs3CpuWeird1_Popf_Nop_Ud2_c32, 32, 4, 1, 2 },
1927	{ bs3CpuWeird1_Popf_opsize_Nop_Ud2_c32, 32, 2, 2, 3 },
1928
1929	{ bs3CpuWeird1_Popf_Nop_Ud2_c64, 64, 8, 1, 2 },
1930	{ bs3CpuWeird1_Popf_opsize_Nop_Ud2_c64, 64, 2, 2, 3 },
1931	};
1932
1933	BS3REGCTX Ctx;
1934	BS3REGCTX CtxExpect;
1935	BS3TRAPFRAME TrapCtx;
1936	BS3PTRUNION PtrStack;
1937	uint8_t const cTestBits = BS3_MODE_IS_16BIT_CODE(bTestMode) ? 16 : BS3_MODE_IS_32BIT_CODE(bTestMode) ? 32 : 64;
1938	uint32_t const fEflCpu = X86_EFL_1 \| X86_EFL_STATUS_BITS \| X86_EFL_DF \| X86_EFL_IF \| X86_EFL_TF
1939	\| ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80286 ? X86_EFL_IOPL \| X86_EFL_NT : 0)
1940	\| ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386 ? X86_EFL_RF \| X86_EFL_VM : 0)
1941	\| ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486 ? X86_EFL_AC \| X86_EFL_VIP \| X86_EFL_VIF : 0)
1942	\| (g_uBs3CpuDetected & BS3CPU_F_CPUID ? X86_EFL_ID : 0);
1943	uint32_t const fEflClear = X86_EFL_1;
1944	uint32_t const fEflSet = X86_EFL_1 \| X86_EFL_STATUS_BITS
1945	\| X86_EFL_DF /* safe? */
1946	\| X86_EFL_IF /* safe? */
1947	\| ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386 ? X86_EFL_RF : 0)
1948	\| ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486 ? X86_EFL_AC \| X86_EFL_VIP : 0)
1949	\| (g_uBs3CpuDetected & BS3CPU_F_CPUID ? X86_EFL_ID : 0);
1950	uint32_t const fEflKeep = X86_EFL_VM;
1951	uint32_t const fXcptRf = BS3_MODE_IS_16BIT_SYS(bTestMode) ? 0 : X86_EFL_RF;
1952	bool const fVme = BS3_MODE_IS_V86(bTestMode)
1953	&& (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486
1954	&& (Bs3RegGetCr4() & X86_CR4_VME); /* Can't use Ctx.cr4 here, it's always zero. */
1955	unsigned uRing;
1956
1957	//Bs3TestPrintf("g_uBs3CpuDetected=%#RX16 fEflCpu=%#RX32 fEflSet=%#RX32\n", g_uBs3CpuDetected, fEflCpu, fEflSet);
1958	/* make sure they're allocated */
1959	Bs3MemZero(&Ctx, sizeof(Ctx));
1960	Bs3MemZero(&TrapCtx, sizeof(TrapCtx));
1961
1962	bs3CpuWeird1_SetGlobals(bTestMode);
1963
1964	/* Construct a basic context. */
1965	Bs3RegCtxSaveEx(&Ctx, bTestMode, 1024);
1966	bs3RegCtxScramble(&Ctx, bTestMode);
1967	Bs3MemCpy(&CtxExpect, &Ctx, sizeof(CtxExpect));
1968
1969	/* Make PtrStack == SS:xSP from Ctx. */
1970	PtrStack.pv = Bs3RegCtxGetRspSsAsCurPtr(&Ctx);
1971
1972	/*
1973	* The instruction works differently in different rings, so try them all.
1974	*/
1975	for (uRing = BS3_MODE_IS_V86(bTestMode) ? 3 : 0; ;)
1976	{
1977	/*
1978	* We've got a couple of instruction variations with/without the opsize prefix.
1979	*/
1980	unsigned iTest;
1981	for (iTest = 0; iTest < RT_ELEMENTS(s_aTests); iTest++)
1982	{
1983	if (s_aTests[iTest].cBits == cTestBits)
1984	{
1985	uint8_t const cbAdjSp = s_aTests[iTest].cbAdjSp;
1986	unsigned uIopl;
1987
1988	/* Setup the test context. */
1989	Bs3RegCtxSetRipCsFromLnkPtr(&Ctx, s_aTests[iTest].pfnStart);
1990	if (BS3_MODE_IS_16BIT_SYS(bTestMode))
1991	g_uBs3TrapEipHint = Ctx.rip.u32;
1992	CtxExpect.cs = Ctx.cs;
1993
1994	for (uIopl = 0; uIopl <= X86_EFL_IOPL; uIopl += 1 << X86_EFL_IOPL_SHIFT)
1995	{
1996	bool const fAlwaysUd = cbAdjSp != 2 && (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) <= BS3CPU_80286;
1997	bool const fAlwaysGp = uIopl != X86_EFL_IOPL && BS3_MODE_IS_V86(bTestMode) && (cbAdjSp == 4 \|\| !fVme);
1998	uint8_t const bXcptNorm = fAlwaysGp ? X86_XCPT_GP : X86_XCPT_UD;
1999	uint8_t const offUd = fAlwaysGp \|\| fAlwaysUd ? 0 : s_aTests[iTest].offUd2;
2000	uint32_t const fCleared = fAlwaysUd ? 0 : fAlwaysGp ? /* 10980xe - go figure: */ X86_EFL_RF
2001	: bTestMode == BS3_MODE_RM
2002	? X86_EFL_RF \| X86_EFL_AC \| X86_EFL_VIP /** @todo figure this. iret? bs3kit bug? */
2003	: X86_EFL_RF;
2004	uint32_t fPoppable = fAlwaysGp \|\| fAlwaysUd ? 0
2005	: uRing == 0 ? X86_EFL_POPF_BITS
2006	: uRing <= (uIopl >> X86_EFL_IOPL_SHIFT) ? X86_EFL_POPF_BITS & ~(X86_EFL_IOPL)
2007	: !fAlwaysGp ? X86_EFL_POPF_BITS & ~(X86_EFL_IOPL \| X86_EFL_IF)
2008	: 0;
2009	uint8_t bXcptExpect;
2010	fPoppable &= fEflCpu;
2011	if (cbAdjSp == 2)
2012	fPoppable &= UINT16_MAX;
2013	if (bTestMode == BS3_MODE_RM && (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) == BS3CPU_80286)
2014	fPoppable &= ~(X86_EFL_IOPL \| X86_EFL_NT);
2015	//Bs3TestPrintf("uRing=%u iTest=%u uIopl=%#x fPoppable=%#RX32 fVme=%d cbAdjSp=%d\n", uRing, iTest, uIopl, fPoppable, fVme, cbAdjSp);
2016
2017	/* The first steps works with as many EFLAGS bits set as possible. */
2018	Ctx.rflags.u32 &= fEflKeep;
2019	Ctx.rflags.u32 \|= fEflSet \| uIopl;
2020	CtxExpect.rip.u = Ctx.rip.u + offUd;
2021	CtxExpect.rsp.u = fAlwaysGp \|\| fAlwaysUd ? Ctx.rsp.u : Ctx.rsp.u + cbAdjSp;
2022
2023	/*
2024	* Step 1 - pop zero.
2025	*/
2026	g_usBs3TestStep++;
2027	PtrStack.pu32[1] = UINT32_MAX;
2028	if (cbAdjSp >= 4)
2029	PtrStack.pu32[0] = 0;
2030	else
2031	{
2032	PtrStack.pu16[1] = UINT16_MAX;
2033	PtrStack.pu16[0] = 0;
2034	}
2035	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared) \| fXcptRf;
2036	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2037	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, bXcptNorm))
2038	break;
2039
2040	/*
2041	* Step 2 - pop 0xfffffff sans TF.
2042	*/
2043	g_usBs3TestStep++;
2044	PtrStack.pu32[1] = UINT32_MAX;
2045	PtrStack.pu32[0] = UINT32_MAX & ~X86_EFL_TF;
2046	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared)
2047	\| (UINT32_MAX & ~X86_EFL_TF & fPoppable & ~fCleared)
2048	\| fXcptRf;
2049	bXcptExpect = bXcptNorm;
2050	if (fVme && cbAdjSp == 2 && uIopl != X86_EFL_IOPL)
2051	{
2052	CtxExpect.rip.u = Ctx.rip.u;
2053	CtxExpect.rsp.u = Ctx.rsp.u;
2054	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fCleared) \| fXcptRf;
2055	bXcptExpect = X86_XCPT_GP;
2056	}
2057	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2058	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, bXcptExpect))
2059	break;
2060
2061
2062	/* We repeat the steps with max bits cleared before the popf. */
2063	Ctx.rflags.u32 &= fEflKeep;
2064	Ctx.rflags.u32 \|= fEflClear \| uIopl;
2065	CtxExpect.rip.u = Ctx.rip.u + offUd;
2066	CtxExpect.rsp.u = fAlwaysGp \|\| fAlwaysUd ? Ctx.rsp.u : Ctx.rsp.u + cbAdjSp;
2067
2068	/*
2069	* Step 3 - pop zero.
2070	*/
2071	g_usBs3TestStep++;
2072	PtrStack.pu32[1] = UINT32_MAX;
2073	if (cbAdjSp >= 4)
2074	PtrStack.pu32[0] = 0;
2075	else
2076	{
2077	PtrStack.pu16[1] = UINT16_MAX;
2078	PtrStack.pu16[0] = 0;
2079	}
2080	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared) \| fXcptRf;
2081	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2082	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, bXcptNorm))
2083	break;
2084
2085	/*
2086	* Step 4 - pop 0xfffffff sans TF.
2087	*/
2088	g_usBs3TestStep++;
2089	PtrStack.pu32[1] = UINT32_MAX;
2090	PtrStack.pu32[0] = UINT32_MAX & ~X86_EFL_TF;
2091	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared)
2092	\| (UINT32_MAX & ~X86_EFL_TF & fPoppable & ~fCleared)
2093	\| fXcptRf;
2094	if (fVme && cbAdjSp == 2 && uIopl != X86_EFL_IOPL)
2095	CtxExpect.rflags.u32 \|= X86_EFL_VIF;
2096	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2097	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, bXcptNorm))
2098	break;
2099
2100	/*
2101	* Step 5 - Pop TF and get a #DB on the following instruction.
2102	*/
2103	g_usBs3TestStep++;
2104	PtrStack.pu32[1] = UINT32_MAX;
2105	PtrStack.pu32[0] = UINT32_MAX;
2106	if (cbAdjSp != 2 \|\| !fVme \|\| uIopl == X86_EFL_IOPL)
2107	{
2108	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared)
2109	\| (UINT32_MAX & fPoppable & ~fCleared)
2110	\| fXcptRf;
2111	CtxExpect.rip.u = Ctx.rip.u + offUd;
2112	if (CtxExpect.rip.u != Ctx.rip.u)
2113	{
2114	bXcptExpect = X86_XCPT_DB;
2115	CtxExpect.rflags.u32 &= ~X86_EFL_RF;
2116	}
2117	else
2118	bXcptExpect = bXcptNorm;
2119	}
2120	else
2121	{
2122	CtxExpect.rflags.u32 = Ctx.rflags.u32 \| fXcptRf;
2123	CtxExpect.rip.u = Ctx.rip.u;
2124	CtxExpect.rsp.u = Ctx.rsp.u;
2125	PtrStack.pu32[0] = UINT32_MAX & ~X86_EFL_IF; /* only one trigger */
2126	bXcptExpect = X86_XCPT_GP;
2127	}
2128	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2129	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, bXcptExpect))
2130	break;
2131
2132	/*
2133	* Step 6 - Start with TF set and pop zeros. Should #DB after POPF.
2134	*/
2135	g_usBs3TestStep++;
2136	PtrStack.pu32[1] = UINT32_MAX;
2137	if (cbAdjSp >= 4)
2138	PtrStack.pu32[0] = 0;
2139	else
2140	{
2141	PtrStack.pu16[1] = UINT16_MAX;
2142	PtrStack.pu16[0] = 0;
2143	}
2144	Ctx.rflags.u32 \|= X86_EFL_TF;
2145	CtxExpect.rip.u = Ctx.rip.u + offUd - !!offUd;
2146	CtxExpect.rsp.u = Ctx.rsp.u + (offUd ? cbAdjSp : 0);
2147	CtxExpect.rflags.u32 = (Ctx.rflags.u32 & ~fPoppable & ~fCleared) \| fXcptRf;
2148	if (offUd)
2149	CtxExpect.rflags.u32 &= ~X86_EFL_RF;
2150
2151	Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx);
2152	if (bs3CpuWeird1_ComparePopf(&TrapCtx, &CtxExpect, offUd ? X86_XCPT_DB : bXcptNorm))
2153	break;
2154
2155	/** @todo test VIP in VME mode. */
2156	g_usBs3TestStep = (g_usBs3TestStep + 9) / 10 * 10;
2157	}
2158	g_usBs3TestStep = (g_usBs3TestStep + 99) / 100 * 100;
2159	}
2160	g_usBs3TestStep = (g_usBs3TestStep + 999) / 1000 * 1000;
2161	}
2162
2163	/*
2164	* Next ring.
2165	*/
2166	if (uRing >= 3 \|\| bTestMode == BS3_MODE_RM)
2167	break;
2168	uRing++;
2169	Bs3RegCtxConvertToRingX(&Ctx, uRing);
2170	CtxExpect.bCpl = Ctx.bCpl;
2171	CtxExpect.ss = Ctx.ss;
2172	CtxExpect.ds = Ctx.ds;
2173	CtxExpect.es = Ctx.es;
2174	CtxExpect.fs = Ctx.fs;
2175	CtxExpect.gs = Ctx.gs;
2176	g_usBs3TestStep = (g_usBs3TestStep + 9999) / 10000 * 10000;
2177	}
2178
2179	return 0;
2180	}
2181

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3-cpu-weird-1-x0.c@ 106330

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