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2da91b54 VP |
1 | /* |
2 | * Windows crashdump | |
3 | * | |
4 | * Copyright (c) 2018 Virtuozzo International GmbH | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include "qemu/osdep.h" | |
12 | #include "qemu/cutils.h" | |
13 | #include "elf.h" | |
2da91b54 VP |
14 | #include "exec/hwaddr.h" |
15 | #include "monitor/monitor.h" | |
16 | #include "sysemu/kvm.h" | |
17 | #include "sysemu/dump.h" | |
2da91b54 VP |
18 | #include "sysemu/memory_mapping.h" |
19 | #include "sysemu/cpus.h" | |
20 | #include "qapi/error.h" | |
21 | #include "qapi/qmp/qerror.h" | |
22 | #include "qemu/error-report.h" | |
23 | #include "hw/misc/vmcoreinfo.h" | |
24 | #include "win_dump.h" | |
25 | ||
f5daa829 VP |
26 | static size_t win_dump_ptr_size(bool x64) |
27 | { | |
28 | return x64 ? sizeof(uint64_t) : sizeof(uint32_t); | |
29 | } | |
fb21efe9 | 30 | |
f5daa829 | 31 | #define _WIN_DUMP_FIELD(f) (x64 ? h->x64.f : h->x32.f) |
fb21efe9 VP |
32 | #define WIN_DUMP_FIELD(field) _WIN_DUMP_FIELD(field) |
33 | ||
f5daa829 | 34 | #define _WIN_DUMP_FIELD_PTR(f) (x64 ? (void *)&h->x64.f : (void *)&h->x32.f) |
fb21efe9 VP |
35 | #define WIN_DUMP_FIELD_PTR(field) _WIN_DUMP_FIELD_PTR(field) |
36 | ||
f5daa829 | 37 | #define _WIN_DUMP_FIELD_SIZE(f) (x64 ? sizeof(h->x64.f) : sizeof(h->x32.f)) |
fb21efe9 VP |
38 | #define WIN_DUMP_FIELD_SIZE(field) _WIN_DUMP_FIELD_SIZE(field) |
39 | ||
f5daa829 VP |
40 | static size_t win_dump_ctx_size(bool x64) |
41 | { | |
42 | return x64 ? sizeof(WinContext64) : sizeof(WinContext32); | |
43 | } | |
fb21efe9 VP |
44 | |
45 | static size_t write_run(uint64_t base_page, uint64_t page_count, | |
46 | int fd, Error **errp) | |
2da91b54 VP |
47 | { |
48 | void *buf; | |
fb21efe9 VP |
49 | uint64_t addr = base_page << TARGET_PAGE_BITS; |
50 | uint64_t size = page_count << TARGET_PAGE_BITS; | |
7184de64 VP |
51 | uint64_t len, l; |
52 | size_t total = 0; | |
2da91b54 | 53 | |
7184de64 VP |
54 | while (size) { |
55 | len = size; | |
2da91b54 | 56 | |
7184de64 VP |
57 | buf = cpu_physical_memory_map(addr, &len, false); |
58 | if (!buf) { | |
59 | error_setg(errp, "win-dump: failed to map physical range" | |
60 | " 0x%016" PRIx64 "-0x%016" PRIx64, addr, addr + size - 1); | |
61 | return 0; | |
62 | } | |
2da91b54 | 63 | |
7184de64 VP |
64 | l = qemu_write_full(fd, buf, len); |
65 | cpu_physical_memory_unmap(buf, addr, false, len); | |
66 | if (l != len) { | |
67 | error_setg(errp, QERR_IO_ERROR); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | addr += l; | |
72 | size -= l; | |
73 | total += l; | |
74 | } | |
2da91b54 | 75 | |
7184de64 | 76 | return total; |
2da91b54 VP |
77 | } |
78 | ||
f5daa829 | 79 | static void write_runs(DumpState *s, WinDumpHeader *h, bool x64, Error **errp) |
2da91b54 | 80 | { |
fb21efe9 | 81 | uint64_t BasePage, PageCount; |
2da91b54 VP |
82 | Error *local_err = NULL; |
83 | int i; | |
84 | ||
fb21efe9 VP |
85 | for (i = 0; i < WIN_DUMP_FIELD(PhysicalMemoryBlock.NumberOfRuns); i++) { |
86 | BasePage = WIN_DUMP_FIELD(PhysicalMemoryBlock.Run[i].BasePage); | |
87 | PageCount = WIN_DUMP_FIELD(PhysicalMemoryBlock.Run[i].PageCount); | |
88 | s->written_size += write_run(BasePage, PageCount, s->fd, &local_err); | |
2da91b54 VP |
89 | if (local_err) { |
90 | error_propagate(errp, local_err); | |
91 | return; | |
92 | } | |
93 | } | |
94 | } | |
95 | ||
f5daa829 | 96 | static int cpu_read_ptr(bool x64, CPUState *cpu, uint64_t addr, uint64_t *ptr) |
fb21efe9 VP |
97 | { |
98 | int ret; | |
f5daa829 | 99 | uint32_t ptr32; |
fb21efe9 VP |
100 | uint64_t ptr64; |
101 | ||
f5daa829 VP |
102 | ret = cpu_memory_rw_debug(cpu, addr, x64 ? (void *)&ptr64 : (void *)&ptr32, |
103 | win_dump_ptr_size(x64), 0); | |
fb21efe9 | 104 | |
f5daa829 | 105 | *ptr = x64 ? ptr64 : ptr32; |
fb21efe9 VP |
106 | |
107 | return ret; | |
108 | } | |
109 | ||
f5daa829 | 110 | static void patch_mm_pfn_database(WinDumpHeader *h, bool x64, Error **errp) |
2da91b54 VP |
111 | { |
112 | if (cpu_memory_rw_debug(first_cpu, | |
f5daa829 | 113 | WIN_DUMP_FIELD(KdDebuggerDataBlock) + KDBG_MM_PFN_DATABASE_OFFSET, |
fb21efe9 VP |
114 | WIN_DUMP_FIELD_PTR(PfnDatabase), |
115 | WIN_DUMP_FIELD_SIZE(PfnDatabase), 0)) { | |
2da91b54 VP |
116 | error_setg(errp, "win-dump: failed to read MmPfnDatabase"); |
117 | return; | |
118 | } | |
119 | } | |
120 | ||
f5daa829 | 121 | static void patch_bugcheck_data(WinDumpHeader *h, bool x64, Error **errp) |
2da91b54 VP |
122 | { |
123 | uint64_t KiBugcheckData; | |
124 | ||
f5daa829 VP |
125 | if (cpu_read_ptr(x64, first_cpu, |
126 | WIN_DUMP_FIELD(KdDebuggerDataBlock) + KDBG_KI_BUGCHECK_DATA_OFFSET, | |
fb21efe9 | 127 | &KiBugcheckData)) { |
2da91b54 VP |
128 | error_setg(errp, "win-dump: failed to read KiBugcheckData"); |
129 | return; | |
130 | } | |
131 | ||
fb21efe9 VP |
132 | if (cpu_memory_rw_debug(first_cpu, KiBugcheckData, |
133 | WIN_DUMP_FIELD(BugcheckData), | |
134 | WIN_DUMP_FIELD_SIZE(BugcheckData), 0)) { | |
2da91b54 VP |
135 | error_setg(errp, "win-dump: failed to read bugcheck data"); |
136 | return; | |
137 | } | |
2ad9b50f VP |
138 | |
139 | /* | |
140 | * If BugcheckCode wasn't saved, we consider guest OS as alive. | |
141 | */ | |
142 | ||
fb21efe9 VP |
143 | if (!WIN_DUMP_FIELD(BugcheckCode)) { |
144 | *(uint32_t *)WIN_DUMP_FIELD_PTR(BugcheckCode) = LIVE_SYSTEM_DUMP; | |
2ad9b50f | 145 | } |
2da91b54 VP |
146 | } |
147 | ||
148 | /* | |
149 | * This routine tries to correct mistakes in crashdump header. | |
150 | */ | |
f5daa829 | 151 | static void patch_header(WinDumpHeader *h, bool x64) |
2da91b54 VP |
152 | { |
153 | Error *local_err = NULL; | |
154 | ||
f5daa829 VP |
155 | if (x64) { |
156 | h->x64.RequiredDumpSpace = sizeof(WinDumpHeader64) + | |
157 | (h->x64.PhysicalMemoryBlock.NumberOfPages << TARGET_PAGE_BITS); | |
158 | h->x64.PhysicalMemoryBlock.unused = 0; | |
159 | h->x64.unused1 = 0; | |
160 | } else { | |
161 | h->x32.RequiredDumpSpace = sizeof(WinDumpHeader32) + | |
162 | (h->x32.PhysicalMemoryBlock.NumberOfPages << TARGET_PAGE_BITS); | |
163 | } | |
2da91b54 | 164 | |
f5daa829 | 165 | patch_mm_pfn_database(h, x64, &local_err); |
2da91b54 VP |
166 | if (local_err) { |
167 | warn_report_err(local_err); | |
168 | local_err = NULL; | |
169 | } | |
f5daa829 | 170 | patch_bugcheck_data(h, x64, &local_err); |
2da91b54 VP |
171 | if (local_err) { |
172 | warn_report_err(local_err); | |
173 | } | |
174 | } | |
175 | ||
f5daa829 | 176 | static bool check_header(WinDumpHeader *h, bool *x64, Error **errp) |
2da91b54 VP |
177 | { |
178 | const char Signature[] = "PAGE"; | |
2da91b54 VP |
179 | |
180 | if (memcmp(h->Signature, Signature, sizeof(h->Signature))) { | |
181 | error_setg(errp, "win-dump: invalid header, expected '%.4s'," | |
182 | " got '%.4s'", Signature, h->Signature); | |
f5daa829 | 183 | return false; |
2da91b54 VP |
184 | } |
185 | ||
f5daa829 VP |
186 | if (!memcmp(h->ValidDump, "DUMP", sizeof(h->ValidDump))) { |
187 | *x64 = false; | |
188 | } else if (!memcmp(h->ValidDump, "DU64", sizeof(h->ValidDump))) { | |
189 | *x64 = true; | |
190 | } else { | |
191 | error_setg(errp, "win-dump: invalid header, expected 'DUMP' or 'DU64'," | |
192 | " got '%.4s'", h->ValidDump); | |
193 | return false; | |
2da91b54 | 194 | } |
f5daa829 VP |
195 | |
196 | return true; | |
2da91b54 VP |
197 | } |
198 | ||
f5daa829 | 199 | static void check_kdbg(WinDumpHeader *h, bool x64, Error **errp) |
2da91b54 VP |
200 | { |
201 | const char OwnerTag[] = "KDBG"; | |
202 | char read_OwnerTag[4]; | |
fb21efe9 | 203 | uint64_t KdDebuggerDataBlock = WIN_DUMP_FIELD(KdDebuggerDataBlock); |
2ababfcc | 204 | bool try_fallback = true; |
2da91b54 | 205 | |
2ababfcc | 206 | try_again: |
2da91b54 | 207 | if (cpu_memory_rw_debug(first_cpu, |
f5daa829 | 208 | KdDebuggerDataBlock + KDBG_OWNER_TAG_OFFSET, |
2da91b54 VP |
209 | (uint8_t *)&read_OwnerTag, sizeof(read_OwnerTag), 0)) { |
210 | error_setg(errp, "win-dump: failed to read OwnerTag"); | |
211 | return; | |
212 | } | |
213 | ||
214 | if (memcmp(read_OwnerTag, OwnerTag, sizeof(read_OwnerTag))) { | |
2ababfcc VP |
215 | if (try_fallback) { |
216 | /* | |
217 | * If attempt to use original KDBG failed | |
218 | * (most likely because of its encryption), | |
219 | * we try to use KDBG obtained by guest driver. | |
220 | */ | |
221 | ||
fb21efe9 | 222 | KdDebuggerDataBlock = WIN_DUMP_FIELD(BugcheckParameter1); |
2ababfcc VP |
223 | try_fallback = false; |
224 | goto try_again; | |
225 | } else { | |
226 | error_setg(errp, "win-dump: invalid KDBG OwnerTag," | |
227 | " expected '%.4s', got '%.4s'", | |
228 | OwnerTag, read_OwnerTag); | |
229 | return; | |
230 | } | |
2da91b54 | 231 | } |
2ababfcc | 232 | |
f5daa829 VP |
233 | if (x64) { |
234 | h->x64.KdDebuggerDataBlock = KdDebuggerDataBlock; | |
235 | } else { | |
236 | h->x32.KdDebuggerDataBlock = KdDebuggerDataBlock; | |
237 | } | |
2da91b54 VP |
238 | } |
239 | ||
2ad9b50f | 240 | struct saved_context { |
f5daa829 | 241 | WinContext ctx; |
2ad9b50f VP |
242 | uint64_t addr; |
243 | }; | |
244 | ||
f5daa829 | 245 | static void patch_and_save_context(WinDumpHeader *h, bool x64, |
2ad9b50f VP |
246 | struct saved_context *saved_ctx, |
247 | Error **errp) | |
248 | { | |
fb21efe9 | 249 | uint64_t KdDebuggerDataBlock = WIN_DUMP_FIELD(KdDebuggerDataBlock); |
2ad9b50f VP |
250 | uint64_t KiProcessorBlock; |
251 | uint16_t OffsetPrcbContext; | |
252 | CPUState *cpu; | |
253 | int i = 0; | |
254 | ||
f5daa829 VP |
255 | if (cpu_read_ptr(x64, first_cpu, |
256 | KdDebuggerDataBlock + KDBG_KI_PROCESSOR_BLOCK_OFFSET, | |
fb21efe9 | 257 | &KiProcessorBlock)) { |
2ad9b50f VP |
258 | error_setg(errp, "win-dump: failed to read KiProcessorBlock"); |
259 | return; | |
260 | } | |
261 | ||
262 | if (cpu_memory_rw_debug(first_cpu, | |
f5daa829 | 263 | KdDebuggerDataBlock + KDBG_OFFSET_PRCB_CONTEXT_OFFSET, |
2ad9b50f VP |
264 | (uint8_t *)&OffsetPrcbContext, sizeof(OffsetPrcbContext), 0)) { |
265 | error_setg(errp, "win-dump: failed to read OffsetPrcbContext"); | |
266 | return; | |
267 | } | |
268 | ||
269 | CPU_FOREACH(cpu) { | |
270 | X86CPU *x86_cpu = X86_CPU(cpu); | |
271 | CPUX86State *env = &x86_cpu->env; | |
272 | uint64_t Prcb; | |
273 | uint64_t Context; | |
f5daa829 | 274 | WinContext ctx; |
2ad9b50f | 275 | |
e38c24cb VP |
276 | if (i >= WIN_DUMP_FIELD(NumberProcessors)) { |
277 | warn_report("win-dump: number of QEMU CPUs is bigger than" | |
278 | " NumberProcessors (%u) in guest Windows", | |
279 | WIN_DUMP_FIELD(NumberProcessors)); | |
280 | return; | |
281 | } | |
282 | ||
f5daa829 VP |
283 | if (cpu_read_ptr(x64, first_cpu, |
284 | KiProcessorBlock + i * win_dump_ptr_size(x64), | |
fb21efe9 | 285 | &Prcb)) { |
2ad9b50f VP |
286 | error_setg(errp, "win-dump: failed to read" |
287 | " CPU #%d PRCB location", i); | |
288 | return; | |
289 | } | |
290 | ||
f5daa829 | 291 | if (cpu_read_ptr(x64, first_cpu, |
2ad9b50f | 292 | Prcb + OffsetPrcbContext, |
fb21efe9 | 293 | &Context)) { |
2ad9b50f VP |
294 | error_setg(errp, "win-dump: failed to read" |
295 | " CPU #%d ContextFrame location", i); | |
296 | return; | |
297 | } | |
298 | ||
299 | saved_ctx[i].addr = Context; | |
300 | ||
f5daa829 VP |
301 | if (x64) { |
302 | ctx.x64 = (WinContext64){ | |
303 | .ContextFlags = WIN_CTX64_ALL, | |
2ad9b50f | 304 | .MxCsr = env->mxcsr, |
f5daa829 VP |
305 | |
306 | .SegEs = env->segs[0].selector, | |
307 | .SegCs = env->segs[1].selector, | |
308 | .SegSs = env->segs[2].selector, | |
309 | .SegDs = env->segs[3].selector, | |
310 | .SegFs = env->segs[4].selector, | |
311 | .SegGs = env->segs[5].selector, | |
312 | .EFlags = cpu_compute_eflags(env), | |
313 | ||
314 | .Dr0 = env->dr[0], | |
315 | .Dr1 = env->dr[1], | |
316 | .Dr2 = env->dr[2], | |
317 | .Dr3 = env->dr[3], | |
318 | .Dr6 = env->dr[6], | |
319 | .Dr7 = env->dr[7], | |
320 | ||
321 | .Rax = env->regs[R_EAX], | |
322 | .Rbx = env->regs[R_EBX], | |
323 | .Rcx = env->regs[R_ECX], | |
324 | .Rdx = env->regs[R_EDX], | |
325 | .Rsp = env->regs[R_ESP], | |
326 | .Rbp = env->regs[R_EBP], | |
327 | .Rsi = env->regs[R_ESI], | |
328 | .Rdi = env->regs[R_EDI], | |
329 | .R8 = env->regs[8], | |
330 | .R9 = env->regs[9], | |
331 | .R10 = env->regs[10], | |
332 | .R11 = env->regs[11], | |
333 | .R12 = env->regs[12], | |
334 | .R13 = env->regs[13], | |
335 | .R14 = env->regs[14], | |
336 | .R15 = env->regs[15], | |
337 | ||
338 | .Rip = env->eip, | |
339 | .FltSave = { | |
340 | .MxCsr = env->mxcsr, | |
341 | }, | |
342 | }; | |
343 | } else { | |
344 | ctx.x32 = (WinContext32){ | |
345 | .ContextFlags = WIN_CTX32_FULL | WIN_CTX_DBG, | |
346 | ||
347 | .SegEs = env->segs[0].selector, | |
348 | .SegCs = env->segs[1].selector, | |
349 | .SegSs = env->segs[2].selector, | |
350 | .SegDs = env->segs[3].selector, | |
351 | .SegFs = env->segs[4].selector, | |
352 | .SegGs = env->segs[5].selector, | |
353 | .EFlags = cpu_compute_eflags(env), | |
354 | ||
355 | .Dr0 = env->dr[0], | |
356 | .Dr1 = env->dr[1], | |
357 | .Dr2 = env->dr[2], | |
358 | .Dr3 = env->dr[3], | |
359 | .Dr6 = env->dr[6], | |
360 | .Dr7 = env->dr[7], | |
361 | ||
362 | .Eax = env->regs[R_EAX], | |
363 | .Ebx = env->regs[R_EBX], | |
364 | .Ecx = env->regs[R_ECX], | |
365 | .Edx = env->regs[R_EDX], | |
366 | .Esp = env->regs[R_ESP], | |
367 | .Ebp = env->regs[R_EBP], | |
368 | .Esi = env->regs[R_ESI], | |
369 | .Edi = env->regs[R_EDI], | |
370 | ||
371 | .Eip = env->eip, | |
372 | }; | |
373 | } | |
2ad9b50f VP |
374 | |
375 | if (cpu_memory_rw_debug(first_cpu, Context, | |
f5daa829 | 376 | &saved_ctx[i].ctx, win_dump_ctx_size(x64), 0)) { |
2ad9b50f VP |
377 | error_setg(errp, "win-dump: failed to save CPU #%d context", i); |
378 | return; | |
379 | } | |
380 | ||
381 | if (cpu_memory_rw_debug(first_cpu, Context, | |
f5daa829 | 382 | &ctx, win_dump_ctx_size(x64), 1)) { |
2ad9b50f VP |
383 | error_setg(errp, "win-dump: failed to write CPU #%d context", i); |
384 | return; | |
385 | } | |
386 | ||
387 | i++; | |
388 | } | |
389 | } | |
390 | ||
f5daa829 | 391 | static void restore_context(WinDumpHeader *h, bool x64, |
2ad9b50f VP |
392 | struct saved_context *saved_ctx) |
393 | { | |
394 | int i; | |
2ad9b50f | 395 | |
fb21efe9 | 396 | for (i = 0; i < WIN_DUMP_FIELD(NumberProcessors); i++) { |
2ad9b50f | 397 | if (cpu_memory_rw_debug(first_cpu, saved_ctx[i].addr, |
f5daa829 | 398 | &saved_ctx[i].ctx, win_dump_ctx_size(x64), 1)) { |
b0e70950 | 399 | warn_report("win-dump: failed to restore CPU #%d context", i); |
2ad9b50f VP |
400 | } |
401 | } | |
402 | } | |
403 | ||
2da91b54 VP |
404 | void create_win_dump(DumpState *s, Error **errp) |
405 | { | |
f5daa829 | 406 | WinDumpHeader *h = (void *)(s->guest_note + VMCOREINFO_ELF_NOTE_HDR_SIZE); |
92d1b3d5 VP |
407 | X86CPU *first_x86_cpu = X86_CPU(first_cpu); |
408 | uint64_t saved_cr3 = first_x86_cpu->env.cr[3]; | |
2ad9b50f | 409 | struct saved_context *saved_ctx = NULL; |
2da91b54 | 410 | Error *local_err = NULL; |
f5daa829 VP |
411 | bool x64 = true; |
412 | size_t hdr_size; | |
2da91b54 | 413 | |
f5daa829 VP |
414 | if (s->guest_note_size != VMCOREINFO_WIN_DUMP_NOTE_SIZE32 && |
415 | s->guest_note_size != VMCOREINFO_WIN_DUMP_NOTE_SIZE64) { | |
2da91b54 VP |
416 | error_setg(errp, "win-dump: invalid vmcoreinfo note size"); |
417 | return; | |
418 | } | |
419 | ||
f5daa829 | 420 | if (!check_header(h, &x64, &local_err)) { |
2da91b54 VP |
421 | error_propagate(errp, local_err); |
422 | return; | |
423 | } | |
424 | ||
f5daa829 VP |
425 | hdr_size = x64 ? sizeof(WinDumpHeader64) : sizeof(WinDumpHeader32); |
426 | ||
92d1b3d5 VP |
427 | /* |
428 | * Further access to kernel structures by virtual addresses | |
429 | * should be made from system context. | |
430 | */ | |
431 | ||
fb21efe9 | 432 | first_x86_cpu->env.cr[3] = WIN_DUMP_FIELD(DirectoryTableBase); |
92d1b3d5 | 433 | |
f5daa829 | 434 | check_kdbg(h, x64, &local_err); |
2da91b54 VP |
435 | if (local_err) { |
436 | error_propagate(errp, local_err); | |
92d1b3d5 | 437 | goto out_cr3; |
2da91b54 VP |
438 | } |
439 | ||
f5daa829 | 440 | patch_header(h, x64); |
2da91b54 | 441 | |
fb21efe9 | 442 | saved_ctx = g_new(struct saved_context, WIN_DUMP_FIELD(NumberProcessors)); |
2ad9b50f VP |
443 | |
444 | /* | |
445 | * Always patch context because there is no way | |
446 | * to determine if the system-saved context is valid | |
447 | */ | |
448 | ||
f5daa829 | 449 | patch_and_save_context(h, x64, saved_ctx, &local_err); |
2ad9b50f VP |
450 | if (local_err) { |
451 | error_propagate(errp, local_err); | |
452 | goto out_free; | |
453 | } | |
454 | ||
fb21efe9 | 455 | s->total_size = WIN_DUMP_FIELD(RequiredDumpSpace); |
2da91b54 | 456 | |
f5daa829 VP |
457 | s->written_size = qemu_write_full(s->fd, h, hdr_size); |
458 | if (s->written_size != hdr_size) { | |
2da91b54 | 459 | error_setg(errp, QERR_IO_ERROR); |
2ad9b50f | 460 | goto out_restore; |
2da91b54 VP |
461 | } |
462 | ||
f5daa829 | 463 | write_runs(s, h, x64, &local_err); |
2da91b54 VP |
464 | if (local_err) { |
465 | error_propagate(errp, local_err); | |
2ad9b50f | 466 | goto out_restore; |
2da91b54 | 467 | } |
92d1b3d5 | 468 | |
2ad9b50f | 469 | out_restore: |
f5daa829 | 470 | restore_context(h, x64, saved_ctx); |
2ad9b50f VP |
471 | out_free: |
472 | g_free(saved_ctx); | |
92d1b3d5 VP |
473 | out_cr3: |
474 | first_x86_cpu->env.cr[3] = saved_cr3; | |
475 | ||
476 | return; | |
2da91b54 | 477 | } |