bootsector2-cpu-xcpt-1-template.mac@ 100800

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1	; $Id: bootsector2-cpu-xcpt-1-template.mac 98103 2023-01-17 14:15:46Z vboxsync $
2	;; @file
3	; Bootsector test for basic exceptions - multi mode template.
4	;
5
6	;
7	; Copyright (C) 2007-2023 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	%include "bootsector2-template-header.mac"
39
40
41	;*******************************************************************************
42	;* Defined Constants And Macros *
43	;*******************************************************************************
44	;;
45	; Some 32/64 macros.
46	;
47	%if TMPL_BITS == 32
48	%define bs2Idt_BP bs2Idt32bit_BP
49	%define MY_R0_CS BS2_SEL_CS32
50	%define MY_R1_CS BS2_SEL_R1_CS32
51	%define MY_R2_CS BS2_SEL_R2_CS32
52	%define MY_R3_CS BS2_SEL_R3_CS32
53
54	%define MY_R0_DS BS2_SEL_DS32
55	%define MY_R1_DS BS2_SEL_R1_DS32
56	%define MY_R2_DS BS2_SEL_R2_DS32
57	%define MY_R3_DS BS2_SEL_R3_DS32
58
59	%define MY_R0_SS BS2_SEL_SS32
60	%define MY_R1_SS BS2_SEL_R1_SS32
61	%define MY_R2_SS BS2_SEL_R2_SS32
62	%define MY_R3_SS BS2_SEL_R3_SS32
63
64	%else
65	%define bs2Idt_BP bs2Idt64bit_BP
66	%define MY_R0_CS BS2_SEL_CS64
67	%define MY_R1_CS BS2_SEL_R1_CS64
68	%define MY_R2_CS BS2_SEL_R2_CS64
69	%define MY_R3_CS BS2_SEL_R3_CS64
70
71	%define MY_R0_DS BS2_SEL_DS64
72	%define MY_R1_DS BS2_SEL_R1_DS64
73	%define MY_R2_DS BS2_SEL_R2_DS64
74	%define MY_R3_DS BS2_SEL_R3_DS64
75
76	%define MY_R0_SS BS2_SEL_SS64
77	%define MY_R1_SS BS2_SEL_R1_SS64
78	%define MY_R2_SS BS2_SEL_R2_SS64
79	%define MY_R3_SS BS2_SEL_R3_SS64
80	%endif
81
82	%ifdef TMPL_64BIT
83	%assign MY_IS_64BIT 1
84	%else
85	%assign MY_IS_64BIT 0
86	%endif
87
88
89	;*******************************************************************************
90	;* Global Variables *
91	;*******************************************************************************
92	%ifndef CPU_XCPT_1_GLOBALS
93	%define CPU_XCPT_1_GLOBALS
94	g_szWrongIfStateFmt:
95	db 'Wrong IF state (0x%RX32) on line 0x%RX32', 0
96	g_szWrongHandlerCsFmt:
97	db 'Wrong handler CS=%RX16, expected %RX16 (line 0x%RX32)', 0
98	g_szWrongCurCsFmt:
99	db 'Wrong CS=%RX16, expected %RX16 (line 0x%RX32)', 0
100	g_szWrongCurSRegFmt_fs:
101	db 'Wrong FS=%RX16, expected %RX16 (line 0x%RX32)', 0
102	g_szWrongCurSRegFmt_ss:
103	db 'Wrong SS=%RX16, expected %RX16 (line 0x%RX32)', 0
104
105
106	;;
107	; Asserts a test.
108	;
109	; @param %1 First cmp operand.
110	; @param %2 First cmp operand.
111	; @param %3 Which kind of conditional jump to make
112	; @param %4 The message to print (format string, no arguments please).
113	;
114	%macro ASSERT_SIMPLE 4
115	cmp %1, %2
116	%3 %%.ok
117	push dword __LINE__
118	%ifdef TMPL_16BIT
119	push ds
120	%endif
121	push %%.s_szMsg
122	call TMPL_NM_CMN(TestFailedF)
123	add xSP, sCB*2
124	jmp %%.ok
125	%%.s_szMsg: db %4, " (0x%RX32)", 0
126	%%.ok:
127	%endmacro
128
129
130	;;
131	; Asserts that the IF flag is set or clear when the trap handler was called.
132	;
133	; @param 1 jnz or jz.
134	;
135	; @uses rax, flags, and stack.
136	;
137	%macro ASSERT_TRAP_EFLAGS_IF 1
138	test word [g_u64LastTrapHandlerRFlags xWrtRIP], X86_EFL_IF
139	%1 %%.ok
140	%ifdef TMPL_LM64
141	push __LINE__
142	push qword [g_u64LastTrapHandlerRFlags xWrtRIP]
143	lea rax, [g_szWrongIfStateFmt wrt RIP]
144	push rax
145	call TMPL_NM_CMN(TestFailedF)
146	add xSP, 24
147	%elifdef TMPL_16
148	push dword __LINE__
149	push dword [g_u64LastTrapHandlerRFlags]
150	push cs
151	push g_szWrongIfStateFmt
152	call TMPL_NM_CMN(TestFailedF)
153	add xSP, 12
154	%else
155	push __LINE__
156	push dword [g_u64LastTrapHandlerRFlags]
157	push g_szWrongIfStateFmt
158	call TMPL_NM_CMN(TestFailedF)
159	add xSP, 12
160	%endif
161	%%.ok:
162	%endmacro
163
164
165	;;
166	; Asserts that a certain CS value when the trap handler was called.
167	;
168	; @param 1 The CS value.
169	;
170	; @uses rax, flags, and stack.
171	;
172	%macro ASSERT_TRAP_CS_VALUE 1
173	cmp word [g_u16LastTrapHandlerCS xWrtRIP], (%1)
174	je %%.ok
175	%ifdef TMPL_LM64
176	push __LINE__
177	push (%1)
178	movzx eax, word [g_u16LastTrapHandlerCS xWrtRIP]
179	push rax
180	lea rax, [g_szWrongHandlerCsFmt wrt RIP]
181	push rax
182	call TMPL_NM_CMN(TestFailedF)
183	add xSP, 32
184	%elifdef TMPL_16
185	push dword __LINE__
186	push word (%1)
187	push word [g_u16LastTrapHandlerCS]
188	push cs
189	push g_szWrongHandlerCsFmt
190	call TMPL_NM_CMN(TestFailedF)
191	add xSP, 12
192	%else
193	push __LINE__
194	push (%1)
195	movzx eax, word [g_u16LastTrapHandlerCS]
196	push eax
197	push g_szWrongHandlerCsFmt
198	call TMPL_NM_CMN(TestFailedF)
199	add xSP, 16
200	%endif
201	%%.ok:
202	%endmacro
203
204	;;
205	; Asserts that a certain CS value right now, CS being loaded in BX.
206	;
207	; @param bx The CS value.
208	; @param 1 The expected CS value.
209	;
210	; @uses rax, flags, and stack.
211	;
212	%macro ASSERT_CUR_CS_VALUE_IN_BX 1
213	cmp bx, (%1)
214	je %%.ok
215	%ifdef TMPL_LM64
216	push __LINE__
217	push (%1)
218	push rbx
219	lea rax, [g_szWrongCurCsFmt wrt RIP]
220	push rax
221	call TMPL_NM_CMN(TestFailedF)
222	add xSP, 32
223	%elifdef TMPL_16
224	push dword __LINE__
225	push word (%1)
226	push bx
227	push g_szWrongCurCsFmt
228	call TMPL_NM_CMN(TestFailedF)
229	add xSP, 12
230	%else
231	push __LINE__
232	push (%1)
233	push ebx
234	push g_szWrongCurCsFmt
235	call TMPL_NM_CMN(TestFailedF)
236	add xSP, 16
237	%endif
238	%%.ok:
239	%endmacro
240
241	;;
242	; Asserts that the given segment register has a certain value right now.
243	;
244	; @param 1 The segment register
245	; @param 2 The value.
246	;
247	; @uses rax, flags, and stack.
248	;
249	%macro ASSERT_CUR_SREG_VALUE 2
250	mov ax, %1
251	cmp ax, (%2)
252	je %%.ok
253	%ifdef TMPL_LM64
254	push __LINE__
255	push (%2)
256	push rax
257	lea rax, [g_szWrongCurSRegFmt_ %+ %1 wrt RIP]
258	push rax
259	call TMPL_NM_CMN(TestFailedF)
260	add xSP, 32
261	%elifdef TMPL_16
262	push dword __LINE__
263	push word (%2)
264	push ax
265	push g_szWrongCurSRegFmt_ %+ %1
266	call TMPL_NM_CMN(TestFailedF)
267	add xSP, 12
268	%else
269	push __LINE__
270	push (%2)
271	push eax
272	push g_szWrongCurSRegFmt_ %+ %1
273	call TMPL_NM_CMN(TestFailedF)
274	add xSP, 16
275	%endif
276	%%.ok:
277	%endmacro
278
279
280	%endif
281
282
283	;;
284	; Checks different gate types.
285	;
286	BEGINPROC TMPL_NM(TestGateType)
287	push xBP
288	mov xBP, xSP
289	push sAX
290	push xBX
291	push xCX
292	push xDX
293	push xDI
294	push xSI
295
296	mov xAX, .s_szSubTestName
297	call TMPL_NM_CMN(TestSub)
298
299
300	;
301	; Check that int3 works and save the IDTE before making changes.
302	;
303	; We'll be changing X86DESCGATE.u4Type, which starts at bit 0x28 (that
304	; is byte 5) and is 4-bit wide, and X86DESCGATE.u1DescType, which is
305	; at bit 2c.
306	;
307	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check that int3 works before we start messing around...
308
309	%ifdef TMPL_LM64
310	push qword [bs2Idt_BP xWrtRIP]
311	push qword [bs2Idt_BP + 8 xWrtRIP]
312	%else
313	push dword [bs2Idt_BP xWrtRIP]
314	push dword [bs2Idt_BP + 4 xWrtRIP]
315	%endif
316	mov xDI, xSP ; for catching stack errors
317
318	;
319	; Check all kinds of none system selectors first (they should all GP(3+IDT))
320	;
321	%assign u4Type 0
322	%rep 16
323	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
324	or byte [bs2Idt_BP + 5 xWrtRIP], RT_BIT(4) \| u4Type
325	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
326	%assign u4Type (u4Type + 1)
327	%endrep
328
329	;
330	; Illegal system types.
331	;
332	%ifdef TMPL_LM64
333	%assign u4Type 0
334	%rep 14
335	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
336	or byte [bs2Idt_BP + 5 xWrtRIP], u4Type
337	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
338	%assign u4Type (u4Type + 1)
339	%endrep
340	%else
341	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
342	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED
343	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
344
345	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
346	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_286_TSS_AVAIL
347	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
348
349	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
350	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_LDT
351	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
352
353	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
354	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_286_TSS_BUSY
355	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
356
357	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
358	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_286_CALL_GATE
359	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
360
361	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
362	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED2
363	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
364
365	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
366	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TSS_AVAIL
367	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
368
369	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
370	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED3
371	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
372
373	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
374	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TSS_BUSY
375	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
376
377	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
378	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED4
379	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
380
381	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
382	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_CALL_GATE
383	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
384	%endif
385
386	;
387	; Legal types.
388	;
389	pushf
390	sti ; make sure interrupts are enabled.
391
392	%ifdef TMPL_LM64
393	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
394	or byte [bs2Idt_BP + 5 xWrtRIP], AMD64_SEL_TYPE_SYS_INT_GATE
395	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
396	ASSERT_TRAP_EFLAGS_IF jz
397
398	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
399	or byte [bs2Idt_BP + 5 xWrtRIP], AMD64_SEL_TYPE_SYS_TRAP_GATE
400	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
401	ASSERT_TRAP_EFLAGS_IF jnz
402	%else
403	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
404	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_INT_GATE
405	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
406	ASSERT_TRAP_EFLAGS_IF jz
407
408	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
409	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TRAP_GATE
410	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
411	ASSERT_TRAP_EFLAGS_IF jnz
412
413	;; @todo X86_SEL_TYPE_SYS_TASK_GATE, X86_SEL_TYPE_SYS_286_INT_GATE, X86_SEL_TYPE_SYS_286_TRAP_GATE, X86_SEL_TYPE_SYS_386_CALL_GATE
414	%endif
415
416	popf
417
418	;
419	; Check that a not-present gate GPs. The not-present bit is 0x2f.
420	;
421	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
422	%ifdef TMPL_LM64
423	or byte [bs2Idt_BP + 5 xWrtRIP], AMD64_SEL_TYPE_SYS_INT_GATE
424	%else
425	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TRAP_GATE
426	%endif
427	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
428
429	and byte [bs2Idt_BP + 5 xWrtRIP], 07fh
430	BS2_TRAP_INSTR X86_XCPT_NP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
431
432	;
433	; Restore the descriptor and make sure it works.
434	;
435	ASSERT_SIMPLE xDI, xSP, je, "Someone busted xSP during this test."
436	%ifdef TMPL_LM64
437	pop qword [bs2Idt_BP + 8 xWrtRIP]
438	pop qword [bs2Idt_BP xWrtRIP]
439	%else
440	pop dword [bs2Idt_BP + 4 xWrtRIP]
441	pop dword [bs2Idt_BP xWrtRIP]
442	%endif
443	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
444
445	;
446	; Done.
447	;
448	call TMPL_NM_CMN(TestSubDone)
449
450	pop xSI
451	pop xDI
452	pop xDX
453	pop xCX
454	pop xBX
455	pop sAX
456	leave
457	ret
458
459	.s_szSubTestName:
460	db TMPL_MODE_STR, ', IDTE type checks', 0
461	ENDPROC TMPL_NM(TestGateType)
462
463
464	;;
465	; Checks different code selector types.
466	;
467	; @uses No registers, but BS2_SEL_SPARE0 is trashed.
468	;
469	BEGINPROC TMPL_NM(TestCodeSelector)
470	push xBP
471	mov xBP, xSP
472	push sAX
473	push xBX
474	push xCX
475	push xDX
476	push xDI
477	push xSI
478
479	mov xAX, .s_szSubTestName
480	call TMPL_NM_CMN(TestSub)
481
482
483	;
484	; Modify the first extra selector to be various kinds of invalid code
485	; selectors.
486	;
487	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check that int3 works before we start messing around...
488
489	%ifdef TMPL_LM64
490	push qword [bs2Idt_BP xWrtRIP]
491	push qword [bs2Idt_BP + 8 xWrtRIP]
492	%else
493	push dword [bs2Idt_BP xWrtRIP]
494	push dword [bs2Idt_BP + 4 xWrtRIP]
495	%endif
496
497	mov ecx, [bs2Gdt + MY_R0_CS xWrtRIP]
498	mov [bs2GdtSpare0 xWrtRIP], ecx
499	mov ecx, [bs2Gdt + MY_R0_CS + 4 xWrtRIP]
500	mov [bs2GdtSpare0 + 4 xWrtRIP], ecx ; GdtSpare0 is a copy of the CS descriptor now.
501
502	mov word [bs2Idt_BP + 2 xWrtRIP], BS2_SEL_SPARE0
503
504	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check again to make sure the CS copy is fine.
505
506
507	; Data selector (u4Type starts at bit 0x28, that is byte 5) .
508	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
509	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RO
510	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
511
512	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
513	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RO_ACC
514	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
515
516	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
517	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RW
518	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
519
520	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
521	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RW_ACC
522	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
523
524	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
525	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RO_DOWN
526	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
527
528	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
529	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RO_DOWN_ACC
530	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
531
532	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
533	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RW_DOWN
534	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
535
536	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
537	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RW_DOWN_ACC
538	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
539
540	; Executable selector types (works fine).
541	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
542	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_EO
543	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
544
545	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
546	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_EO_ACC
547	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
548
549	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
550	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER
551	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
552
553	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
554	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC
555	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
556
557	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
558	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_EO_CONF
559	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
560
561	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
562	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_EO_CONF_ACC
563	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
564
565	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
566	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_CONF
567	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
568
569	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
570	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_CONF_ACC
571	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
572
573	;
574	; Test with the code selector set to NULL.
575	;
576	mov word [bs2Idt_BP + 2 xWrtRIP], 0
577	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
578
579	mov word [bs2Idt_BP + 2 xWrtRIP], 1
580	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
581
582	mov word [bs2Idt_BP + 2 xWrtRIP], 2
583	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
584
585	mov word [bs2Idt_BP + 2 xWrtRIP], 3
586	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
587
588	mov word [bs2Idt_BP + 2 xWrtRIP], BS2_SEL_SPARE0 ; restore our CS
589
590	;
591	; Test with the code selector marked as not present but otherwise valid.
592	;
593	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
594	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC
595	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
596
597	and byte [bs2GdtSpare0 + 5 xWrtRIP], 07fh
598	BS2_TRAP_INSTR X86_XCPT_NP, BS2_SEL_SPARE0, int3
599
600	;
601	; Invalid CS selector and not present, we should get a GP.
602	; Intel states that the present bit is checked after the type.
603	;
604	and byte [bs2GdtSpare0 + 5 xWrtRIP], 070h
605	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RW_DOWN_ACC
606	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
607
608	%ifdef TMPL_LM64
609	; Long mode variations on invalid (L and D bits) pitted against NP.
610	and byte [bs2GdtSpare0 + 5 xWrtRIP], 070h
611	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC
612	and byte [bs2GdtSpare0 + 6 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6)) ; (0x35=u1Long, 0x36=u1DefBig) = (0, 0)
613	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
614
615	or byte [bs2GdtSpare0 + 6 xWrtRIP], RT_BIT(6) ; (0x35=u1Long, 0x36=u1DefBig) = (0, 1)
616	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
617
618	or byte [bs2GdtSpare0 + 6 xWrtRIP], RT_BIT(5) ; (0x35=u1Long, 0x36=u1DefBig) = (1, 1)
619	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
620
621	and byte [bs2GdtSpare0 + 6 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
622	or byte [bs2GdtSpare0 + 6 xWrtRIP], RT_BIT(5) ; restored
623	%endif
624
625	and byte [bs2GdtSpare0 + 5 xWrtRIP], 070h
626	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC \| 080h ; restore CS to present & valid.
627	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; make sure this is so.
628
629	;
630	; Check the CS DPL vs IDTE DPL.
631	; X86DESCGENERIC.u2Dpl is at bit 0x2d (i.e. in byte 5).
632	;
633	and byte [bs2GdtSpare0 + 5 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
634	or byte [bs2GdtSpare0 + 5 xWrtRIP], 0 ; CS.DPL == 0 == CPL
635	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
636
637	and byte [bs2GdtSpare0 + 5 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
638	or byte [bs2GdtSpare0 + 5 xWrtRIP], 1 << 5 ; CS.DPL == 1 < CPL
639	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
640
641	and byte [bs2GdtSpare0 + 5 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
642	or byte [bs2GdtSpare0 + 5 xWrtRIP], 2 << 5 ; CS.DPL == 2 < CPL
643	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
644
645	and byte [bs2GdtSpare0 + 5 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
646	or byte [bs2GdtSpare0 + 5 xWrtRIP], 3 << 5 ; CS.DPL == 3 < CPL
647	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
648
649	; Restore.
650	and byte [bs2GdtSpare0 + 5 xWrtRIP], 010h
651	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC \| 080h ; restore CS to present, valid and DPL=0
652	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; make sure it's restored.
653
654	;
655	; Is RPL is ignored? Yes, it is.
656	;
657	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL ; RPL = 0
658	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
659	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0
660
661	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
662	or byte [bs2Idt_BP + 2 xWrtRIP], 1 ; RPL = 1
663	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
664	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0
665
666	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
667	or byte [bs2Idt_BP + 2 xWrtRIP], 2 ; RPL = 2
668	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
669	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0
670
671	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
672	or byte [bs2Idt_BP + 2 xWrtRIP], 3 ; RPL = 3
673	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
674	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0
675
676	;
677	; Conforming CS.
678	;
679	or byte [bs2Idt_BP + 5 xWrtRIP], (3 << 5) ; IDTE.DPL = 3
680	and byte [bs2GdtSpare0 + 5 xWrtRIP], 090h
681	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_CONF_ACC ; CS.DPL=0, code, read, conforming
682
683	call TMPL_NM_CMN(Bs2ToRing1)
684	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
685	call TMPL_NM_CMN(Bs2ToRing0)
686	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 1
687
688	call TMPL_NM_CMN(Bs2ToRing2)
689	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
690	call TMPL_NM_CMN(Bs2ToRing0)
691	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 2
692
693	call TMPL_NM_CMN(Bs2ToRing3)
694	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
695	call TMPL_NM_CMN(Bs2ToRing0)
696	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 3
697
698	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
699	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 0
700
701	; RPL is ignored. Only CPL matters.
702	or byte [bs2Idt_BP + 2 xWrtRIP], (3 << 5) ; IDTE.CS.RPL=3
703	call TMPL_NM_CMN(Bs2ToRing2)
704	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
705	call TMPL_NM_CMN(Bs2ToRing0)
706	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 2
707
708	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
709	or byte [bs2Idt_BP + 2 xWrtRIP], (1 << 5) ; IDTE.CS.RPL=1
710	call TMPL_NM_CMN(Bs2ToRing2)
711	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
712	call TMPL_NM_CMN(Bs2ToRing0)
713	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 2
714
715	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
716	or byte [bs2Idt_BP + 2 xWrtRIP], (2 << 5) ; IDTE.CS.RPL=2
717	call TMPL_NM_CMN(Bs2ToRing2)
718	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
719	call TMPL_NM_CMN(Bs2ToRing0)
720	ASSERT_TRAP_CS_VALUE BS2_SEL_SPARE0 \| 2
721
722	; Change the CS.DPL to 1 and try it from ring-0.
723	and byte [bs2GdtSpare0 + 5 xWrtRIP], 09fh
724	or byte [bs2GdtSpare0 + 5 xWrtRIP], (1 << 5) ; CS.DPL=1
725	BS2_TRAP_INSTR X86_XCPT_GP, BS2_SEL_SPARE0, int3
726
727	; Restore.
728	and word [bs2Idt_BP + 2 xWrtRIP], X86_SEL_MASK_OFF_RPL
729	and byte [bs2Idt_BP + 5 xWrtRIP], 0x9f ; IDTE.DPL=0
730	and byte [bs2GdtSpare0 + 5 xWrtRIP], 010h
731	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_ER_ACC \| 080h ; restore CS to present, valid and DPL=0
732	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; make sure it's restored.
733
734	;
735	; Limit / canonical checks.
736	;
737	; Messing with X86DESCGENERIC.u16LimitLow which is at bit 0,
738	; X86DESCGENERIC.u4LimitHigh which is at bit 0x30, and
739	; X86DESCGENERIC.u1Granularity which is at bit 0x37.
740	;
741	mov word [bs2GdtSpare0 xWrtRIP], 0010h
742	and byte [bs2GdtSpare0 + 6 xWrtRIP], 070h ; setting limit to 0x10, ASSUMES IDTE.off > 0x10
743	%ifdef TMPL_LM64
744	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
745	%else
746	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
747	%endif
748
749	%ifdef TMPL_LM64
750	or dword [bs2Idt_BP + 8 xWrtRIP], 0x007f7f33
751	BS2_TRAP_INSTR X86_XCPT_GP, 0, int3
752	%endif
753
754	; Who takes precedence? CS NP or the above GP? NP does.
755	and byte [bs2GdtSpare0 + 5 xWrtRIP], 07fh
756	BS2_TRAP_INSTR X86_XCPT_NP, BS2_SEL_SPARE0, int3
757
758
759	%ifdef TMPL_LM64
760	; Who takes precedence? IDTE NP or the not canoncial GP? NP does.
761	or byte [bs2GdtSpare0 + 5 xWrtRIP], 80h
762	and byte [bs2Idt_BP + 5 xWrtRIP], 07fh
763	BS2_TRAP_INSTR X86_XCPT_NP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
764	%endif
765
766	;
767	; Restore the descriptor and make sure it works.
768	;
769	%ifdef TMPL_LM64
770	pop qword [bs2Idt_BP + 8 xWrtRIP]
771	pop qword [bs2Idt_BP xWrtRIP]
772	%else
773	pop dword [bs2Idt_BP + 4 xWrtRIP]
774	pop dword [bs2Idt_BP xWrtRIP]
775	%endif
776	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
777
778	;
779	; Done.
780	;
781	call TMPL_NM_CMN(TestSubDone)
782
783	pop xSI
784	pop xDI
785	pop xDX
786	pop xCX
787	pop xBX
788	pop sAX
789	leave
790	ret
791
792	.s_szSubTestName:
793	db TMPL_MODE_STR, ', IDTE CS checks', 0
794	ENDPROC TMPL_NM(TestCodeSelector)
795
796
797	;;
798	; Checks that the IDTE type is checked before the CS type.
799	;
800	; @uses No registers, but BS2_SEL_SPARE0 is trashed.
801	;
802	BEGINPROC TMPL_NM(TestCheckOrderCsTypeVsIdteType)
803	push xBP
804	mov xBP, xSP
805	push sAX
806	push xBX
807	push xCX
808	push xDX
809	push xDI
810	push xSI
811
812	mov xAX, .s_szSubTestName
813	call TMPL_NM_CMN(TestSub)
814
815
816	;
817	; Check the int3 and save its IDTE.
818	;
819	; We'll be changing X86DESCGATE.u4Type, which starts at bit 0x28 (that
820	; is byte 5) and is 4-bit wide, and X86DESCGATE.u1DescType, which is
821	; at bit 2c.
822	;
823	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check that int3 works before we start messing around...
824
825	%ifdef TMPL_LM64
826	push qword [bs2Idt_BP xWrtRIP]
827	push qword [bs2Idt_BP + 8 xWrtRIP]
828	%else
829	push dword [bs2Idt_BP xWrtRIP]
830	push dword [bs2Idt_BP + 4 xWrtRIP]
831	%endif
832
833	;
834	; Make a copy of our CS descriptor into spare one and make INT3 use it.
835	;
836	mov ecx, [bs2Gdt + MY_R0_CS xWrtRIP]
837	mov [bs2GdtSpare0 xWrtRIP], ecx
838	mov ecx, [bs2Gdt + MY_R0_CS + 4 xWrtRIP]
839	mov [bs2GdtSpare0 + 4 xWrtRIP], ecx ; GdtSpare0 is a copy of the CS descriptor now.
840
841	mov word [bs2Idt_BP + 2 xWrtRIP], BS2_SEL_SPARE0
842
843	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check again to make sure the CS copy is fine.
844
845	;
846	; Make both the IDTE type and CS invalid, we should end up with a IDT GP not the CS one.
847	; CS = data selector and IDTE invalid 0 type.
848	;
849	and byte [bs2GdtSpare0 + 5 xWrtRIP], 0f0h
850	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_RO
851
852	and byte [bs2Idt_BP + 5 xWrtRIP], 0e0h
853	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED
854	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
855
856	;
857	; Make the IDTE not-present but otherwise fine, keeping CS invalid.
858	;
859	and byte [bs2Idt_BP + 5 xWrtRIP], 070h
860	%ifdef TMPL_LM64
861	or byte [bs2Idt_BP + 5 xWrtRIP], AMD64_SEL_TYPE_SYS_INT_GATE
862	%else
863	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TRAP_GATE
864	%endif
865	BS2_TRAP_INSTR X86_XCPT_NP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
866
867	;
868	; Make the CS not present as well.
869	;
870	and byte [bs2GdtSpare0 + 5 xWrtRIP], 070h
871	or byte [bs2GdtSpare0 + 5 xWrtRIP], X86_SEL_TYPE_EO
872	BS2_TRAP_INSTR X86_XCPT_NP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
873
874	;
875	; CS not present, IDTE invalid but present.
876	;
877	and byte [bs2Idt_BP + 5 xWrtRIP], 0f0h
878	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_UNDEFINED \| 0x80
879	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
880
881	;
882	; CS NULL, IDTE invalid but present.
883	;
884	mov word [bs2Idt_BP + 2 xWrtRIP], 0
885	BS2_TRAP_INSTR X86_XCPT_GP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
886
887	;
888	; CS NULL, IDTE valid but not present.
889	;
890	and byte [bs2Idt_BP + 5 xWrtRIP], 070h
891	%ifdef TMPL_LM64
892	or byte [bs2Idt_BP + 5 xWrtRIP], AMD64_SEL_TYPE_SYS_INT_GATE
893	%else
894	or byte [bs2Idt_BP + 5 xWrtRIP], X86_SEL_TYPE_SYS_386_TRAP_GATE
895	%endif
896	BS2_TRAP_INSTR X86_XCPT_NP, (3 << X86_TRAP_ERR_SEL_SHIFT) \| X86_TRAP_ERR_IDT, int3
897
898	;
899	; Restore the descriptor and make sure it works.
900	;
901	%ifdef TMPL_LM64
902	pop qword [bs2Idt_BP + 8 xWrtRIP]
903	pop qword [bs2Idt_BP xWrtRIP]
904	%else
905	pop dword [bs2Idt_BP + 4 xWrtRIP]
906	pop dword [bs2Idt_BP xWrtRIP]
907	%endif
908	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
909
910	;
911	; Done.
912	;
913	call TMPL_NM_CMN(TestSubDone)
914
915	pop xSI
916	pop xDI
917	pop xDX
918	pop xCX
919	pop xBX
920	pop sAX
921	leave
922	ret
923
924	.s_szSubTestName:
925	db TMPL_MODE_STR, ', IDTE.type before CS.type', 0
926	ENDPROC TMPL_NM(TestCheckOrderCsTypeVsIdteType)
927
928
929	;;
930	; Checks stack switching behavior.
931	;
932	; @uses none
933	;
934	BEGINPROC TMPL_NM(TestStack)
935	push xBP
936	mov xBP, xSP
937	push sAX
938	push xBX
939	push xCX
940	push xDX
941	push xDI
942	push xSI
943	pushf
944	cli
945
946	mov xAX, .s_szSubTestName
947	call TMPL_NM_CMN(TestSub)
948
949
950	;
951	; Check the int3, save its IDTE, then make it ring-3 accessible.
952	;
953	; X86DESCGENERIC.u2Dpl is at bit 0x2d (i.e. in byte 5).
954	;
955	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check that int3 works before we start messing around...
956
957	%ifdef TMPL_LM64
958	push qword [bs2Idt_BP xWrtRIP]
959	push qword [bs2Idt_BP + 8 xWrtRIP]
960	%else
961	push dword [bs2Idt_BP xWrtRIP]
962	push dword [bs2Idt_BP + 4 xWrtRIP]
963	%endif
964
965	and byte [bs2Idt_BP + 5 xWrtRIP], ~(RT_BIT(5) \| RT_BIT(6))
966	or byte [bs2Idt_BP + 5 xWrtRIP], 3 << 5 ; DPL == 3
967
968	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
969
970
971	;
972	; In ring-0 no stack switching is performed.
973	;
974	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
975	mov xBX, [g_u64LastTrapHandlerRSP]
976	%ifdef TMPL_64BIT
977	mov rax, rsp
978	and rax, ~15
979	sub rax, 7*8
980	%else
981	lea eax, [esp - 5*4]
982	%endif
983	ASSERT_SIMPLE sAX, xBX, je, "Wrong xSP value for ring-0 -> ring-0 int3."
984	mov bx, [g_u16LastTrapHandlerSS]
985	mov ax, ss
986	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-0 -> ring-0 int3."
987
988	;
989	; Switch to ring-1 and watch stack switching take place.
990	;
991	call TMPL_NM_CMN(Bs2ToRing1)
992
993	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
994	mov xBX, [g_u64LastTrapHandlerRSP]
995	mov sAX, BS2_R0_STACK_ADDR
996	%ifdef TMPL_64BIT
997	and rax, ~15
998	sub rax, 7*8
999	%else
1000	sub eax, 7*4
1001	%endif
1002	ASSERT_SIMPLE sAX, xBX, je, "Wrong xSP value for ring-1 -> ring-0 int3."
1003	mov bx, [g_u16LastTrapHandlerSS]
1004	%ifdef TMPL_64BIT
1005	mov ax, 0
1006	%else
1007	mov ax, MY_R0_SS
1008	%endif
1009	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-1 -> ring-0 int3."
1010
1011	call TMPL_NM_CMN(Bs2ToRing0)
1012
1013	;
1014	; Missaligned stack, ring-0 -> ring-0.
1015	;
1016	mov xDI, xSP ; save the stack pointer.
1017	%rep 15
1018	sub xSP, 1h
1019
1020	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1021	mov xBX, [g_u64LastTrapHandlerRSP]
1022	%ifdef TMPL_64BIT
1023	mov rax, rsp
1024	and rax, ~15
1025	sub rax, 7*8
1026	%else
1027	lea eax, [esp - 5*4]
1028	%endif
1029	ASSERT_SIMPLE sAX, xBX, je, "Wrong xSP value for ring-0 -> ring-0 int3, w/ unaligned stack."
1030	mov bx, [g_u16LastTrapHandlerSS]
1031	mov ax, ss
1032	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-0 -> ring-0 int3, w/ unaligned stack."
1033
1034	%endrep
1035	mov xSP, xDI ; restore the stack pointer.
1036
1037	;
1038	; Missaligned stack, ring-1 -> ring-0.
1039	;
1040	call TMPL_NM_CMN(Bs2ToRing1)
1041
1042	mov sSI, BS2_R0_STACK_ADDR - 16
1043	%rep 16
1044	add sSI, 1
1045	%ifdef TMPL_64BIT
1046	mov [bs2Tss64Bit + 4], sSI
1047	%else
1048	mov [bs2Tss32Bit + 4], sSI
1049	%endif
1050
1051	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1052	mov xBX, [g_u64LastTrapHandlerRSP]
1053	mov sAX, sSI
1054	%ifdef TMPL_64BIT
1055	and rax, ~15
1056	sub rax, 7*8
1057	%else
1058	sub eax, 7*4
1059	%endif
1060	ASSERT_SIMPLE sAX, xBX, je, "Wrong xSP value for ring-1 -> ring-0 int3, w/ unaligned ring-0 stack."
1061	mov bx, [g_u16LastTrapHandlerSS]
1062	%ifdef TMPL_64BIT
1063	mov ax, 0
1064	%else
1065	mov ax, MY_R0_SS
1066	%endif
1067	ASSERT_SIMPLE sAX, xBX, je, "Wrong SS value for ring-1 -> ring-0 int3, w/ unaligned ring-0 stack."
1068
1069	%endrep
1070	call TMPL_NM_CMN(Bs2ToRing0)
1071
1072
1073	%ifdef TMPL_64BIT
1074	;
1075	; Stack table (AMD64 only), ring-0 -> ring-0.
1076	;
1077	and byte [bs2Idt_BP + 4], ~7
1078	or byte [bs2Idt_BP + 4], 3 ; IDTE.IST=3
1079
1080	mov rdi, [bs2Tss64Bit + X86TSS64.ist3]
1081	mov rsi, BS2_R0_STACK_ADDR - 128
1082	%rep 16
1083	sub rsi, 1h
1084	mov [bs2Tss64Bit + X86TSS64.ist3], rsi
1085
1086	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1087	mov rbx, [g_u64LastTrapHandlerRSP]
1088	mov rax, rsi
1089	and rax, ~15
1090	sub rax, 7*8
1091	ASSERT_SIMPLE rax, rbx, je, "Wrong xSP value for ring-0 -> ring-0 int3, w/ unaligned IST."
1092	mov bx, [g_u16LastTrapHandlerSS]
1093	mov ax, ss
1094	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-0 -> ring-0 int3, w/ unaligned IST."
1095
1096	%endrep
1097
1098	; Continue in ring-1,2,3.
1099	%assign uCurRing 1
1100	%rep 3
1101	call TMPL_NM_CMN(Bs2ToRing %+ uCurRing)
1102	%rep 16
1103	sub rsi, 1h
1104	mov [bs2Tss64Bit + X86TSS64.ist3], rsi
1105
1106	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1107	mov rbx, [g_u64LastTrapHandlerRSP]
1108	mov rax, rsi
1109	and rax, ~15
1110	sub rax, 7*8
1111	ASSERT_SIMPLE rax, rbx, je, "Wrong xSP value for ring-X -> ring-0 int3, w/ unaligned IST."
1112	mov bx, [g_u16LastTrapHandlerSS]
1113	mov ax, 0
1114	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-X -> ring-0 int3, w/ unaligned IST."
1115	%endrep
1116	call TMPL_NM_CMN(Bs2ToRing0)
1117	%assign uCurRing (uCurRing + 1)
1118	%endrep
1119
1120	mov [bs2Tss64Bit + X86TSS64.ist3], rdi ; restore original value
1121	and byte [bs2Idt_BP + 4], ~7 ; IDTE.IST=0
1122
1123
1124	;
1125	; Check SS handling when interrupting 32-bit code with a 64-bit handler.
1126	;
1127	call Bs2Thunk_lm64_lm32
1128	BITS 32
1129	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1130	mov bx, [g_u16LastTrapHandlerSS]
1131	mov ax, ss
1132	call Bs2Thunk_lm32_lm64
1133	BITS 64
1134	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-0-32 -> ring-0-64 int3, w/ 32-bit stack."
1135
1136	call Bs2Thunk_lm64_lm32
1137	BITS 32
1138	mov cx, ss
1139	mov ax, BS2_SEL_SS16
1140	mov ss, ax
1141	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1142	mov bx, [g_u16LastTrapHandlerSS]
1143	mov ss, cx
1144	call Bs2Thunk_lm32_lm64
1145	BITS 64
1146	ASSERT_SIMPLE ax, bx, je, "Wrong SS value for ring-0-32 -> ring-0-64 int3, w/ 16-bit stack."
1147
1148	%endif ; TMPL_64BIT
1149
1150
1151	;
1152	; Restore the descriptor and make sure it works.
1153	;
1154	%ifdef TMPL_LM64
1155	pop qword [bs2Idt_BP + 8 xWrtRIP]
1156	pop qword [bs2Idt_BP xWrtRIP]
1157	%else
1158	pop dword [bs2Idt_BP + 4 xWrtRIP]
1159	pop dword [bs2Idt_BP xWrtRIP]
1160	%endif
1161	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1162
1163	;
1164	; Done.
1165	;
1166	call TMPL_NM_CMN(TestSubDone)
1167
1168	popf
1169	pop xSI
1170	pop xDI
1171	pop xDX
1172	pop xCX
1173	pop xBX
1174	pop sAX
1175	leave
1176	ret
1177
1178	.s_szSubTestName:
1179	db TMPL_MODE_STR, ', Stack switching', 0
1180	ENDPROC TMPL_NM(TestStack)
1181
1182
1183
1184	;;
1185	; Loads MY_R0_CS into CS.
1186	;
1187	; @uses stack, cs, flags
1188	;
1189	BEGINPROC TMPL_NM(TestLoadMyCS)
1190	push 0
1191	push xAX
1192
1193	; Make it a far return with MY_R0_CS + CPL.
1194	mov xAX, [xSP + xCB*2]
1195	mov [xSP + xCB*1], xAX
1196	mov xAX, ss
1197	%ifdef TMPL_64BIT
1198	sub xAX, BS2_SEL_GRP_SS64 - BS2_SEL_GRP_CS64
1199	%elifdef TMPL_32BIT
1200	sub xAX, BS2_SEL_GRP_SS32 - BS2_SEL_GRP_CS32
1201	%elifdef TMPL_16BIT
1202	sub xAX, BS2_SEL_GRP_SS16 - BS2_SEL_GRP_CS16
1203	%else
1204	TMPL_xxBIT is not defined
1205	%endif
1206	mov [xSP + xCB*2], xAX
1207
1208	pop xAX
1209	retf
1210	ENDPROC TMPL_NM(TestLoadMyCS)
1211
1212
1213	;;
1214	; Checks our understanding of how conforming segments are handled.
1215	;
1216	; @uses No registers, but BS2_SEL_SPARE0 is trashed.
1217	;
1218	BEGINPROC TMPL_NM(TestConforming)
1219	push xBP
1220	mov xBP, xSP
1221	push sAX
1222	push xBX
1223	push xCX
1224	push xDX
1225	push xDI
1226	push xSI
1227
1228	mov xAX, .s_szSubTestName
1229	call TMPL_NM_CMN(TestSub)
1230
1231	;
1232	; Check the int3.
1233	;
1234	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3 ; check that int3 works before we start messing around...
1235
1236	mov xDI, xSP ; save the stack pointer.
1237	sub xSP, 20h
1238
1239	;
1240	; In this test we will do various experiments with code using a
1241	; conforming CS. The main purpose is to check that CS.RPL is always the
1242	; same as CPL, despite earlier beliefs to the contrary. Because if it
1243	; is different, iret cannot dermine the CPL to return to among other
1244	; interesting problems.
1245	;
1246	mov ecx, [bs2Gdt + MY_R0_CS xWrtRIP]
1247	mov [bs2GdtSpare0 xWrtRIP], ecx
1248	mov ecx, [bs2Gdt + MY_R0_CS + 4 xWrtRIP]
1249	mov [bs2GdtSpare0 + 4 xWrtRIP], ecx ; GdtSpare0 is a copy of the CS descriptor now.
1250	and byte [bs2GdtSpare0 + 5], 0x90 ; DPL = 0
1251	or byte [bs2GdtSpare0 + 5], X86_SEL_TYPE_ER_CONF_ACC
1252
1253	%assign uCurRing 0
1254	%rep 4
1255	; Far jumps.
1256	%assign uSpecifiedRpl 0
1257	%rep 4
1258	call TMPL_NM_CMN(Bs2ToRing %+ uCurRing)
1259	lea xAX, [.far_jmp_target_ %+ uSpecifiedRpl %+ uCurRing]
1260	%ifdef TMPL_64BIT ; AMD doesn't have an jmp far m16:m64 instruction, it ignores REX.W apparently. Intel does though.
1261	; Tested on: Bulldozer
1262	mov dword [xSP + 4], BS2_SEL_SPARE0 \| uSpecifiedRpl
1263	mov [xSP], eax
1264	jmp far dword [xSP]
1265	%else
1266	mov dword [xSP + xCB], BS2_SEL_SPARE0 \| uSpecifiedRpl
1267	mov [xSP], xAX
1268	jmp far xPRE [xSP]
1269	%endif
1270	.far_jmp_target_ %+ uSpecifiedRpl %+ uCurRing:
1271	mov bx, cs
1272	call TMPL_NM(TestLoadMyCS)
1273	call TMPL_NM_CMN(Bs2ToRing0)
1274	ASSERT_CUR_CS_VALUE_IN_BX BS2_SEL_SPARE0 \| uCurRing
1275	%assign uSpecifiedRpl uSpecifiedRpl + 1
1276	%endrep
1277
1278	; Far calls.
1279	%assign uSpecifiedRpl 0
1280	%rep 4
1281	call TMPL_NM_CMN(Bs2ToRing %+ uCurRing)
1282	mov xSI, xSP
1283	lea xAX, [.far_call_target_ %+ uSpecifiedRpl %+ uCurRing]
1284	%ifdef TMPL_64BIT ; AMD doesn't have an call far m16:m64 instruction, it ignores REX.W apparently. Intel does though.
1285	; Tested on: Bulldozer
1286	mov dword [xSP + 4], BS2_SEL_SPARE0 \| uSpecifiedRpl
1287	mov [xSP], eax
1288	call far dword [xSP]
1289	%else
1290	mov dword [xSP + xCB], BS2_SEL_SPARE0 \| uSpecifiedRpl
1291	mov [xSP], xAX
1292	call far xPRE [xSP]
1293	%endif
1294	.far_call_target_ %+ uSpecifiedRpl %+ uCurRing:
1295	mov bx, cs
1296	%ifdef TMPL_64BIT
1297	add xSP, 4 * 2
1298	%else
1299	add xSP, xCB * 2
1300	%endif
1301	call TMPL_NM(TestLoadMyCS)
1302	call TMPL_NM_CMN(Bs2ToRing0)
1303	ASSERT_CUR_CS_VALUE_IN_BX BS2_SEL_SPARE0 \| uCurRing
1304	%assign uSpecifiedRpl uSpecifiedRpl + 1
1305	%endrep
1306
1307	%assign uCurRing uCurRing + 1
1308	%endrep
1309
1310	;
1311	; While at it, lets check something about RPL and non-conforming
1312	; segments. The check when loading is supposed to be RPL >= DPL,
1313	; except for when loading SS, where RPL = DPL = CPL.
1314	;
1315
1316	; ring-0
1317	mov dx, MY_R0_DS \| 0
1318	mov fs, dx
1319	ASSERT_CUR_SREG_VALUE fs, MY_R0_DS \| 0
1320	mov dx, MY_R0_DS \| 1
1321	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1322	mov dx, MY_R0_DS \| 2
1323	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1324	mov dx, MY_R0_DS \| 3
1325	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1326
1327	; ring-0 - Lower DPL isn't an issue, only RPL vs DPL.
1328	mov dx, MY_R1_DS \| 0
1329	mov fs, dx
1330	ASSERT_CUR_SREG_VALUE fs, MY_R1_DS \| 0
1331	mov dx, MY_R1_DS \| 1
1332	mov fs, dx
1333	ASSERT_CUR_SREG_VALUE fs, MY_R1_DS \| 1
1334	mov dx, MY_R1_DS \| 2
1335	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1336
1337	mov dx, MY_R2_DS \| 0
1338	mov fs, dx
1339	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 0
1340	mov dx, MY_R2_DS \| 2
1341	mov fs, dx
1342	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 2
1343	mov dx, MY_R2_DS \| 3
1344	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1345
1346	mov dx, MY_R3_DS \| 0
1347	mov fs, dx
1348	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 0
1349	mov dx, MY_R3_DS \| 1
1350	mov fs, dx
1351	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 1
1352	mov dx, MY_R3_DS \| 2
1353	mov fs, dx
1354	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 2
1355	mov dx, MY_R3_DS \| 3
1356	mov fs, dx
1357	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 3
1358
1359	; ring-0 - What works above doesn't work with ss.
1360	mov dx, MY_R1_DS \| 0
1361	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov ss, dx
1362	mov dx, MY_R1_DS \| 1
1363	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov ss, dx
1364	mov dx, MY_R1_DS \| 2
1365	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov ss, dx
1366	mov dx, MY_R2_DS \| 0
1367	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov ss, dx
1368	mov dx, MY_R3_DS \| 0
1369	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1370	mov dx, MY_R3_DS \| 3
1371	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1372
1373
1374	; ring-1
1375	call TMPL_NM_CMN(Bs2ToRing1)
1376
1377	mov dx, MY_R1_DS \| 0
1378	mov fs, dx
1379	ASSERT_CUR_SREG_VALUE fs, MY_R1_DS \| 0
1380	mov dx, MY_R1_DS \| 1
1381	mov fs, dx
1382	ASSERT_CUR_SREG_VALUE fs, MY_R1_DS \| 1
1383	mov dx, MY_R1_DS \| 2
1384	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1385	mov dx, MY_R1_DS \| 3
1386	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1387
1388	mov dx, MY_R0_DS \| 0
1389	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1390	mov dx, MY_R0_DS \| 1
1391	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1392	mov dx, MY_R0_DS \| 2
1393	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1394	mov dx, MY_R0_DS \| 3
1395	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1396
1397	; ring-1 - Lower DPL isn't an issue, only RPL vs DPL.
1398	mov dx, MY_R2_DS \| 0
1399	mov fs, dx
1400	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 0
1401	mov dx, MY_R2_DS \| 1
1402	mov fs, dx
1403	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 1
1404	mov dx, MY_R2_DS \| 2
1405	mov fs, dx
1406	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 2
1407	mov dx, MY_R2_DS \| 3
1408	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1409
1410	mov dx, MY_R3_DS \| 0
1411	mov fs, dx
1412	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 0
1413	mov dx, MY_R3_DS \| 1
1414	mov fs, dx
1415	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 1
1416	mov dx, MY_R3_DS \| 2
1417	mov fs, dx
1418	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 2
1419	mov dx, MY_R3_DS \| 3
1420	mov fs, dx
1421	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 3
1422
1423	; ring-1 - What works above doesn't work with ss.
1424	mov dx, MY_R1_DS \| 0
1425	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov ss, dx
1426	mov dx, MY_R1_DS \| 2
1427	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov ss, dx
1428	mov dx, MY_R2_DS \| 0
1429	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov ss, dx
1430	mov dx, MY_R3_DS \| 0
1431	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1432	mov dx, MY_R3_DS \| 3
1433	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1434
1435
1436	; ring-2
1437	call TMPL_NM_CMN(Bs2ToRing2)
1438
1439	mov dx, MY_R2_DS \| 0
1440	mov fs, dx
1441	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 0
1442	mov dx, MY_R2_DS \| 1
1443	mov fs, dx
1444	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 1
1445	mov dx, MY_R2_DS \| 2
1446	mov fs, dx
1447	ASSERT_CUR_SREG_VALUE fs, MY_R2_DS \| 2
1448	mov dx, MY_R2_DS \| 3
1449	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1450
1451	mov dx, MY_R0_DS \| 0
1452	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1453	mov dx, MY_R0_DS \| 1
1454	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1455	mov dx, MY_R0_DS \| 2
1456	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1457	mov dx, MY_R0_DS \| 3
1458	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1459	mov dx, MY_R1_DS \| 1
1460	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1461	mov dx, MY_R1_DS \| 2
1462	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1463
1464	; ring-2 - Lower DPL isn't an issue, only RPL vs DPL.
1465	mov dx, MY_R3_DS \| 0
1466	mov fs, dx
1467	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 0
1468	mov dx, MY_R3_DS \| 1
1469	mov fs, dx
1470	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 1
1471	mov dx, MY_R3_DS \| 2
1472	mov fs, dx
1473	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 2
1474	mov dx, MY_R3_DS \| 3
1475	mov fs, dx
1476	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 3
1477
1478	; ring-2 - What works above doesn't work with ss.
1479	mov dx, MY_R2_DS \| 1
1480	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov ss, dx
1481	mov dx, MY_R2_DS \| 3
1482	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov ss, dx
1483	mov dx, MY_R3_DS \| 0
1484	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1485	mov dx, MY_R3_DS \| 1
1486	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1487	mov dx, MY_R3_DS \| 2
1488	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1489	mov dx, MY_R3_DS \| 3
1490	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1491
1492
1493	; ring-3
1494	call TMPL_NM_CMN(Bs2ToRing3)
1495
1496	mov dx, MY_R3_DS \| 0
1497	mov fs, dx
1498	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 0
1499	mov dx, MY_R3_DS \| 1
1500	mov fs, dx
1501	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 1
1502	mov dx, MY_R3_DS \| 2
1503	mov fs, dx
1504	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 2
1505	mov dx, MY_R3_DS \| 3
1506	mov fs, dx
1507	ASSERT_CUR_SREG_VALUE fs, MY_R3_DS \| 3
1508
1509	mov dx, MY_R0_DS \| 0
1510	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1511	mov dx, MY_R0_DS \| 1
1512	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1513	mov dx, MY_R0_DS \| 2
1514	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1515	mov dx, MY_R0_DS \| 3
1516	BS2_TRAP_INSTR X86_XCPT_GP, MY_R0_DS, mov fs, dx
1517
1518	mov dx, MY_R1_DS \| 1
1519	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1520	mov dx, MY_R1_DS \| 2
1521	BS2_TRAP_INSTR X86_XCPT_GP, MY_R1_DS, mov fs, dx
1522
1523	mov dx, MY_R2_DS \| 0
1524	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1525	mov dx, MY_R2_DS \| 1
1526	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1527	mov dx, MY_R2_DS \| 2
1528	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1529	mov dx, MY_R2_DS \| 3
1530	BS2_TRAP_INSTR X86_XCPT_GP, MY_R2_DS, mov fs, dx
1531
1532	; ring-0 - What works above doesn't work with ss.
1533	mov dx, MY_R3_DS \| 0
1534	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1535	mov dx, MY_R3_DS \| 1
1536	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1537	mov dx, MY_R3_DS \| 2
1538	BS2_TRAP_INSTR X86_XCPT_GP, MY_R3_DS, mov ss, dx
1539
1540	call TMPL_NM_CMN(Bs2ToRing0)
1541
1542
1543	;
1544	; One more odd thing, NULL selectors and RPL.
1545	;
1546	pushf
1547	cli
1548
1549	%assign uCurRing 0
1550	%rep 4
1551	; Null sectors.
1552	call TMPL_NM_CMN(Bs2ToRing %+ uCurRing)
1553	mov si, ss
1554
1555	mov dx, 0
1556	mov fs, dx
1557	ASSERT_CUR_SREG_VALUE fs, 0
1558	%if MY_IS_64BIT == 0 \|\| uCurRing != 0
1559	%ifdef TMPL_64BIT ; AMD is doing something inconsistent.
1560	%if uCurRing != 3
1561	test byte [g_fCpuAmd], 1
1562	jz .null_0_not_amd_ %+ uCurRing
1563	mov ss, dx
1564	ASSERT_CUR_SREG_VALUE ss, 0
1565	jmp .null_0_next_ %+ uCurRing
1566	.null_0_not_amd_ %+ uCurRing:
1567	%endif
1568	%endif
1569	BS2_TRAP_INSTR X86_XCPT_GP, 0, mov ss, dx
1570	.null_0_next_ %+ uCurRing:
1571	%else
1572	mov ss, dx
1573	ASSERT_CUR_SREG_VALUE ss, 0
1574	%endif
1575	mov ss, si
1576
1577	mov dx, 1
1578	mov fs, dx
1579	ASSERT_CUR_SREG_VALUE fs, 1
1580	%if MY_IS_64BIT == 0 \|\| uCurRing != 1
1581	%ifdef TMPL_64BIT ; AMD is doing something inconsistent.
1582	%if uCurRing != 3
1583	test byte [g_fCpuAmd], 1
1584	jz .null_1_not_amd_ %+ uCurRing
1585	mov ss, dx
1586	ASSERT_CUR_SREG_VALUE ss, 1
1587	jmp .null_1_next_ %+ uCurRing
1588	.null_1_not_amd_ %+ uCurRing:
1589	%endif
1590	%endif
1591	BS2_TRAP_INSTR X86_XCPT_GP, 0, mov ss, dx
1592	.null_1_next_ %+ uCurRing:
1593	%else
1594	mov ss, dx
1595	ASSERT_CUR_SREG_VALUE ss, 1
1596	%endif
1597	mov ss, si
1598
1599	mov dx, 2
1600	mov fs, dx
1601	ASSERT_CUR_SREG_VALUE fs, 2
1602	%if MY_IS_64BIT == 0 \|\| uCurRing != 2
1603	%ifdef TMPL_64BIT ; AMD is doing something inconsistent.
1604	%if uCurRing != 3
1605	test byte [g_fCpuAmd], 1
1606	jz .null_2_not_amd_ %+ uCurRing
1607	mov ss, dx
1608	ASSERT_CUR_SREG_VALUE ss, 2
1609	jmp .null_2_next_ %+ uCurRing
1610	.null_2_not_amd_ %+ uCurRing:
1611	%endif
1612	%endif
1613	BS2_TRAP_INSTR X86_XCPT_GP, 0, mov ss, dx
1614	.null_2_next_ %+ uCurRing:
1615	%else
1616	mov ss, dx
1617	ASSERT_CUR_SREG_VALUE ss, 2
1618	%endif
1619	mov ss, si
1620
1621	mov dx, 3
1622	mov fs, dx
1623	ASSERT_CUR_SREG_VALUE fs, 3
1624	%ifdef TMPL_64BIT ; AMD is doing something inconsistent.
1625	%if uCurRing != 3
1626	test byte [g_fCpuAmd], 1
1627	jz .null_3_not_amd_ %+ uCurRing
1628	mov ss, dx
1629	ASSERT_CUR_SREG_VALUE ss, 3
1630	jmp .null_3_next_ %+ uCurRing
1631	.null_3_not_amd_ %+ uCurRing:
1632	%endif
1633	%endif
1634	BS2_TRAP_INSTR X86_XCPT_GP, 0, mov ss, dx
1635	.null_3_next_ %+ uCurRing:
1636	mov ss, si
1637
1638	%assign uCurRing uCurRing + 1
1639	%endrep
1640	call TMPL_NM_CMN(Bs2ToRing0)
1641
1642	; Restore the selectors.
1643	mov dx, MY_R0_DS
1644	mov ds, dx
1645	mov es, dx
1646	mov fs, dx
1647	mov gs, dx
1648	popf
1649
1650
1651	;
1652	; Restore the descriptor and make sure it works.
1653	;
1654	mov xSP, xDI ; restore the stack pointer.
1655	BS2_TRAP_INSTR X86_XCPT_BP, 0, int3
1656
1657	;
1658	; Done.
1659	;
1660	call TMPL_NM_CMN(TestSubDone)
1661
1662	pop xSI
1663	pop xDI
1664	pop xDX
1665	pop xCX
1666	pop xBX
1667	pop sAX
1668	leave
1669	ret
1670
1671	.s_szSubTestName:
1672	db TMPL_MODE_STR, ', Conforming CS, ++', 0
1673	ENDPROC TMPL_NM(TestConforming)
1674
1675
1676
1677	;;
1678	; Returning from interrupt/trap/whatever handlers.
1679	;
1680	; @uses No registers, but BS2_SEL_SPARE0 is trashed.
1681	;
1682	BEGINPROC TMPL_NM(TestReturn)
1683	push xBP
1684	mov xBP, xSP
1685	push sAX
1686	push xBX
1687	push xCX
1688	push xDX
1689	push xDI
1690	push xSI
1691	sub xSP, 80h ; iret stack frame space.
1692	mov xSI, xSP ; Save the stack register.
1693
1694	mov xAX, .s_szSubTestName
1695	call TMPL_NM_CMN(TestSub)
1696
1697	%ifdef TMPL_64BIT
1698	pushfq
1699	pop rdi ; rdi contains good flags register value.
1700
1701	;
1702	; 64-bit mode: IRETQ unconditional pop of SS:RSP.
1703	;
1704	mov qword [rsp + 20h], MY_R0_SS
1705	mov [rsp + 18h], rsp
1706	mov [rsp + 10h], rdi
1707	mov qword [rsp + 08h], MY_R0_CS
1708	lea rax, [.resume1 wrt rip]
1709	mov [rsp + 00h], rax
1710	iretq
1711
1712	.resume1:
1713	pushfq
1714	pop rbx
1715	ASSERT_SIMPLE rsp, rsi, je, "Wrong RSP after IRETQ."
1716	mov rsp, rsi
1717	ASSERT_SIMPLE rbx, rdi, je, "Wrong flags after IRETQ."
1718	mov ax, ss
1719	ASSERT_SIMPLE ax, MY_R0_SS, je, "Wrong SS after IRETQ."
1720	mov ax, cs
1721	ASSERT_SIMPLE ax, MY_R0_CS, je, "Wrong CS after IRETQ."
1722
1723	; 64-bit mode: The NT flag causes #GP(0)
1724	mov qword [rsp + 20h], MY_R0_SS
1725	lea rax, [rsp - 100h]
1726	mov [rsp + 18h], rax
1727	mov [rsp + 10h], rdi
1728	mov qword [rsp + 08h], MY_R0_CS
1729	lea rax, [.resume2 wrt rip]
1730	mov [rsp + 00h], rax
1731	push rdi
1732	or dword [rsp], X86_EFL_NT
1733	popfq
1734	BS2_TRAP_BRANCH_INSTR X86_XCPT_GP, 0, .resume2, iretq
1735	pushfq
1736	pop rbx
1737	push rdi
1738	popfq
1739	ASSERT_SIMPLE rsp, rsi, je, "Wrong RSP after IRETQ."
1740	mov rsp, rsi
1741	mov rax, rdi
1742	or rax, X86_EFL_NT
1743	ASSERT_SIMPLE rbx, rax, je, "Wrong flags after IRETQ GP(0)-NT."
1744	mov ax, ss
1745	ASSERT_SIMPLE ax, MY_R0_SS, je, "Wrong SS after IRETQ."
1746	mov ax, cs
1747	ASSERT_SIMPLE ax, MY_R0_CS, je, "Wrong CS after IRETQ."
1748
1749	; 64-bit mode: The VM flag is disregarded.
1750	mov qword [rsp + 20h], MY_R0_SS
1751	lea rax, [rsp - 88h]
1752	mov [rsp + 18h], rax
1753	mov [rsp + 10h], rdi
1754	or dword [rsp + 10h], X86_EFL_VM
1755	mov qword [rsp + 08h], MY_R0_CS
1756	lea rax, [.resume3 wrt rip]
1757	mov [rsp + 00h], rax
1758	iretq
1759	.resume3:
1760	pushfq
1761	pop rbx
1762	add rsp, 88h
1763	ASSERT_SIMPLE rsp, rsi, je, "Wrong RSP after IRETQ."
1764	mov rsp, rsi
1765	mov rax, rdi
1766	ASSERT_SIMPLE rbx, rax, je, "Wrong flags after IRETQ GP(0)-NT."
1767	mov ax, ss
1768	ASSERT_SIMPLE ax, MY_R0_SS, je, "Wrong SS after IRETQ."
1769	mov ax, cs
1770	ASSERT_SIMPLE ax, MY_R0_CS, je, "Wrong CS after IRETQ."
1771
1772	;
1773	; 64-bit mode: IRETD unconditionally pops SS:ESP as well.
1774	;
1775	mov dword [rsp + 10h], MY_R0_SS
1776	lea eax, [esp - 18h]
1777	mov [rsp + 0ch], eax
1778	mov [rsp + 08h], edi
1779	mov dword [rsp + 04h], MY_R0_CS
1780	lea eax, [.resume20 wrt rip]
1781	mov [rsp + 00h], eax
1782	iretd
1783	.resume20:
1784	pushfq
1785	pop rbx
1786	add rsp, 18h
1787	ASSERT_SIMPLE rsp, rsi, je, "Wrong RSP after IRETD."
1788	mov rsp, rsi
1789	ASSERT_SIMPLE rbx, rdi, je, "Wrong flags after IRETD."
1790	mov ax, ss
1791	ASSERT_SIMPLE ax, MY_R0_SS, je, "Wrong SS after IRETD."
1792	mov ax, cs
1793	ASSERT_SIMPLE ax, MY_R0_CS, je, "Wrong CS after IRETD."
1794
1795	;
1796	; 64-bit mode: IRET unconditionally pops SS:SP as well.
1797	;
1798	mov word [rsp + 08h], MY_R0_SS
1799	lea eax, [esp - 1ah]
1800	mov [rsp + 06h], ax
1801	mov [rsp + 04h], di
1802	mov word [rsp + 02h], MY_R0_CS
1803	mov word [rsp + 00h], .resume30
1804	o16 iret
1805	BEGINCODELOW
1806	.resume30:
1807	jmp .high1
1808	BEGINCODEHIGH
1809	.high1:
1810	pushfq
1811	pop rbx
1812	add rsp, 1ah
1813	ASSERT_SIMPLE rsp, rsi, je, "Wrong RSP after IRET."
1814	mov rsp, rsi
1815	ASSERT_SIMPLE rbx, rdi, je, "Wrong flags after IRET."
1816	mov ax, ss
1817	ASSERT_SIMPLE ax, MY_R0_SS, je, "Wrong SS after IRET."
1818	mov ax, cs
1819	ASSERT_SIMPLE ax, MY_R0_CS, je, "Wrong CS after IRET."
1820
1821
1822	%elifdef TMPL_32BIT
1823	; later...
1824	%endif
1825
1826	;
1827	; Returning to 16-bit code, what happens to upper ESP bits?
1828	;
1829	cli
1830	mov xBX, xSP ; save the current stack address
1831
1832	mov sAX, BS2_SEL_R3_SS16 \| 3
1833	push sAX ; Return SS
1834	movzx edi, bx
1835	or edi, 0xdead0000
1836	push sDI ; Return sSP
1837	%ifdef TMPL_64BIT
1838	pushfq
1839	%else
1840	pushfd
1841	%endif
1842	mov sAX, BS2_SEL_R3_CS16 \| 3
1843	push sAX ; Return CS
1844	lea sAX, [.resume100 xWrtRIP]
1845	push sAX ; Return sIP
1846	%ifdef TMPL_64BIT
1847	iretq
1848	%else
1849	iretd
1850	%endif
1851
1852	BEGINCODELOW
1853	BITS 16
1854	.resume100:
1855	xchg ebx, esp
1856	call Bs2ToRing0_p16
1857	call TMPL_NM(Bs2Thunk_p16)
1858	BITS TMPL_BITS
1859	jmp .high100
1860	BEGINCODEHIGH
1861	.high100:
1862	and edi, 0ffffh
1863	ASSERT_SIMPLE ebx, edi, je, "IRET to 16-bit didn't restore ESP as expected [#1]."
1864
1865	%ifndef TMPL_16BIT
1866	;
1867	; Take two on 16-bit return, does the high word of ESP leak?
1868	;
1869	cli
1870	mov sBX, sSP ; save the current stack address
1871	mov xSP, BS2_MUCK_ABOUT_BASE + 1000h
1872
1873	mov sAX, BS2_SEL_R3_SS16 \| 3
1874	push sAX ; Return SS
1875	mov sDI, sBX
1876	push sDI ; Return sSP
1877	%ifdef TMPL_64BIT
1878	pushfq
1879	%else
1880	pushfd
1881	%endif
1882	mov sAX, BS2_SEL_R3_CS16 \| 3
1883	push sAX ; Return CS
1884	lea sAX, [.resume101 xWrtRIP]
1885	push sAX ; Return sIP
1886	%ifdef TMPL_64BIT
1887	iretq
1888	%else
1889	iretd
1890	%endif
1891
1892	BEGINCODELOW
1893	BITS 16
1894	.resume101:
1895	xchg ebx, esp
1896	call Bs2ToRing0_p16
1897	call TMPL_NM(Bs2Thunk_p16)
1898	BITS TMPL_BITS
1899	jmp .high101
1900	BEGINCODEHIGH
1901	.high101:
1902	or edi, (BS2_MUCK_ABOUT_BASE + 1000h) & 0ffff0000h
1903	ASSERT_SIMPLE ebx, edi, je, "IRET to 16-bit didn't restore ESP as expected [#2]."
1904	%endif ; Not 16-bit.
1905
1906	;
1907	; Done.
1908	;
1909	call TMPL_NM_CMN(TestSubDone)
1910
1911	mov xSP, xSI
1912	add xSP, 80h
1913	pop xSI
1914	pop xDI
1915	pop xDX
1916	pop xCX
1917	pop xBX
1918	pop sAX
1919	leave
1920	ret
1921
1922	.s_szSubTestName:
1923	db TMPL_MODE_STR, ', IRET', 0
1924	ENDPROC TMPL_NM(TestReturn)
1925
1926	;;
1927	; Do the tests for this mode.
1928	;
1929	; @uses nothing
1930	;
1931	BEGINCODELOW
1932	BITS 16
1933	BEGINPROC TMPL_NM(DoTestsForMode_rm)
1934	push bp
1935	mov bp, sp
1936	push ax
1937
1938	;
1939	; Check if the mode and NX is supported, do the switch.
1940	;
1941	call TMPL_NM(Bs2IsModeSupported_rm)
1942	jz .done
1943	call TMPL_NM(Bs2EnterMode_rm)
1944	BITS TMPL_BITS
1945
1946	;
1947	; Test exception handler basics using INT3 and #BP.
1948	;
1949
1950	call TMPL_NM(TestGateType)
1951	call TMPL_NM(TestCodeSelector)
1952	call TMPL_NM(TestCheckOrderCsTypeVsIdteType)
1953	call TMPL_NM(TestStack)
1954	call TMPL_NM(TestConforming)
1955	call TMPL_NM(TestReturn)
1956
1957	;
1958	; Back to real mode.
1959	;
1960	call TMPL_NM(Bs2ExitMode)
1961	BITS 16
1962	call Bs2DisableNX_r86
1963
1964	.done:
1965	pop ax
1966	leave
1967	ret
1968	ENDPROC TMPL_NM(DoTestsForMode_rm)
1969	TMPL_BEGINCODE
1970	BITS TMPL_BITS
1971
1972	%include "bootsector2-template-footer.mac"
1973

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