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ntdll: Use DECLSPEC_HIDDEN for a few more symbols.
[wine.git] / dlls / ntdll / unix / signal_i386.c
blob87024e1bfce7249b5727c42a39915915c84518cb
1 /*
2 * i386 signal handling routines
3 *
4 * Copyright 1999 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #if 0
22 #pragma makedep unix
23 #endif
24
25 #ifdef __i386__
26
27 #include "config.h"
28 #include "wine/port.h"
29
30 #include <errno.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <sys/types.h>
36 #include <assert.h>
37 #ifdef HAVE_UNISTD_H
38 # include <unistd.h>
39 #endif
40 #ifdef HAVE_SYS_PARAM_H
41 # include <sys/param.h>
42 #endif
43 #ifdef HAVE_SYSCALL_H
44 # include <syscall.h>
45 #else
46 # ifdef HAVE_SYS_SYSCALL_H
47 # include <sys/syscall.h>
48 # endif
49 #endif
50 #ifdef HAVE_SYS_SIGNAL_H
51 # include <sys/signal.h>
52 #endif
53 #ifdef HAVE_SYS_UCONTEXT_H
54 # include <sys/ucontext.h>
55 #endif
56
57 #include "ntstatus.h"
58 #define WIN32_NO_STATUS
59 #include "windef.h"
60 #include "winternl.h"
61 #include "ddk/wdm.h"
62 #include "wine/asm.h"
63 #include "wine/exception.h"
64 #include "unix_private.h"
65 #include "wine/debug.h"
66
67 WINE_DEFAULT_DEBUG_CHANNEL(seh);
68
69 #undef ERR /* Solaris needs to define this */
70
71 /***********************************************************************
72 * signal context platform-specific definitions
73 */
74
75 #ifdef __linux__
76
77 #ifndef HAVE_SYS_UCONTEXT_H
78
79 enum
80 {
81 REG_GS, REG_FS, REG_ES, REG_DS, REG_EDI, REG_ESI, REG_EBP, REG_ESP,
82 REG_EBX, REG_EDX, REG_ECX, REG_EAX, REG_TRAPNO, REG_ERR, REG_EIP,
83 REG_CS, REG_EFL, REG_UESP, REG_SS, NGREG
84 };
85
86 typedef int greg_t;
87 typedef greg_t gregset_t[NGREG];
88
89 struct _libc_fpreg
90 {
91 unsigned short significand[4];
92 unsigned short exponent;
93 };
94
95 struct _libc_fpstate
96 {
97 unsigned long cw;
98 unsigned long sw;
99 unsigned long tag;
100 unsigned long ipoff;
101 unsigned long cssel;
102 unsigned long dataoff;
103 unsigned long datasel;
104 struct _libc_fpreg _st[8];
105 unsigned long status;
106 };
107
108 typedef struct _libc_fpstate* fpregset_t;
109
110 typedef struct
111 {
112 gregset_t gregs;
113 fpregset_t fpregs;
114 unsigned long oldmask;
115 unsigned long cr2;
116 } mcontext_t;
117
118 typedef struct ucontext
119 {
120 unsigned long uc_flags;
121 struct ucontext *uc_link;
122 stack_t uc_stack;
123 mcontext_t uc_mcontext;
124 sigset_t uc_sigmask;
125 } ucontext_t;
126 #endif /* HAVE_SYS_UCONTEXT_H */
127
128 #ifndef FP_XSTATE_MAGIC1
129 #define FP_XSTATE_MAGIC1 0x46505853
130 #endif
131
132 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
133 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
134 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
135 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
136 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
137 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
138 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
139 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
140
141 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
142 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
143 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
144 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
145 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
146 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
147
148 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
149 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
150 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
151 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
152
153 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
154 #define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XSAVE_FORMAT *)(FPU_sig(context) + 1) : NULL)
155 #define XState_sig(fpu) (((unsigned int *)fpu->Reserved4)[12] == FP_XSTATE_MAGIC1 ? (XSTATE *)(fpu + 1) : NULL)
156
157 #ifdef __ANDROID__
158 /* custom signal restorer since we may have unmapped the one in vdso, and bionic doesn't check for that */
159 void rt_sigreturn(void);
160 __ASM_GLOBAL_FUNC( rt_sigreturn,
161 "movl $173,%eax\n\t" /* NR_rt_sigreturn */
162 "int $0x80" );
163 #endif
164
165 struct modify_ldt_s
166 {
167 unsigned int entry_number;
168 void *base_addr;
169 unsigned int limit;
170 unsigned int seg_32bit : 1;
171 unsigned int contents : 2;
172 unsigned int read_exec_only : 1;
173 unsigned int limit_in_pages : 1;
174 unsigned int seg_not_present : 1;
175 unsigned int usable : 1;
176 unsigned int garbage : 25;
177 };
178
179 static inline int modify_ldt( int func, struct modify_ldt_s *ptr, unsigned long count )
180 {
181 return syscall( 123 /* SYS_modify_ldt */, func, ptr, count );
182 }
183
184 static inline int set_thread_area( struct modify_ldt_s *ptr )
185 {
186 return syscall( 243 /* SYS_set_thread_area */, ptr );
187 }
188
189 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
190
191 #include <machine/trap.h>
192 #include <machine/segments.h>
193 #include <machine/sysarch.h>
194
195 #define EAX_sig(context) ((context)->uc_mcontext.mc_eax)
196 #define EBX_sig(context) ((context)->uc_mcontext.mc_ebx)
197 #define ECX_sig(context) ((context)->uc_mcontext.mc_ecx)
198 #define EDX_sig(context) ((context)->uc_mcontext.mc_edx)
199 #define ESI_sig(context) ((context)->uc_mcontext.mc_esi)
200 #define EDI_sig(context) ((context)->uc_mcontext.mc_edi)
201 #define EBP_sig(context) ((context)->uc_mcontext.mc_ebp)
202
203 #define CS_sig(context) ((context)->uc_mcontext.mc_cs)
204 #define DS_sig(context) ((context)->uc_mcontext.mc_ds)
205 #define ES_sig(context) ((context)->uc_mcontext.mc_es)
206 #define FS_sig(context) ((context)->uc_mcontext.mc_fs)
207 #define GS_sig(context) ((context)->uc_mcontext.mc_gs)
208 #define SS_sig(context) ((context)->uc_mcontext.mc_ss)
209
210 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
211 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
212 #define EFL_sig(context) ((context)->uc_mcontext.mc_eflags)
213
214 #define EIP_sig(context) ((context)->uc_mcontext.mc_eip)
215 #define ESP_sig(context) ((context)->uc_mcontext.mc_esp)
216
217 #define FPU_sig(context) NULL /* FIXME */
218 #define FPUX_sig(context) NULL /* FIXME */
219 #define XState_sig(context) NULL /* FIXME */
220
221 #elif defined (__OpenBSD__)
222
223 #include <machine/segments.h>
224 #include <machine/sysarch.h>
225
226 #define EAX_sig(context) ((context)->sc_eax)
227 #define EBX_sig(context) ((context)->sc_ebx)
228 #define ECX_sig(context) ((context)->sc_ecx)
229 #define EDX_sig(context) ((context)->sc_edx)
230 #define ESI_sig(context) ((context)->sc_esi)
231 #define EDI_sig(context) ((context)->sc_edi)
232 #define EBP_sig(context) ((context)->sc_ebp)
233
234 #define CS_sig(context) ((context)->sc_cs)
235 #define DS_sig(context) ((context)->sc_ds)
236 #define ES_sig(context) ((context)->sc_es)
237 #define FS_sig(context) ((context)->sc_fs)
238 #define GS_sig(context) ((context)->sc_gs)
239 #define SS_sig(context) ((context)->sc_ss)
240
241 #define TRAP_sig(context) ((context)->sc_trapno)
242 #define ERROR_sig(context) ((context)->sc_err)
243 #define EFL_sig(context) ((context)->sc_eflags)
244
245 #define EIP_sig(context) ((context)->sc_eip)
246 #define ESP_sig(context) ((context)->sc_esp)
247
248 #define FPU_sig(context) NULL /* FIXME */
249 #define FPUX_sig(context) NULL /* FIXME */
250 #define XState_sig(context) NULL /* FIXME */
251
252 #define T_MCHK T_MACHK
253 #define T_XMMFLT T_XFTRAP
254
255 #elif defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
256
257 #if defined(_SCO_DS) || defined(__sun)
258 #include <sys/regset.h>
259 #endif
260
261 #ifdef _SCO_DS
262 #define gregs regs
263 #endif
264
265 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
266 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
267 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
268 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
269 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
270 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
271 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
272
273 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
274 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
275 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
276 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
277
278 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
279 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
280
281 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
282
283 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
284 #ifdef UESP
285 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
286 #elif defined(R_ESP)
287 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
288 #else
289 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
290 #endif
291 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
292 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
293
294 #define FPU_sig(context) NULL /* FIXME */
295 #define FPUX_sig(context) NULL /* FIXME */
296 #define XState_sig(context) NULL /* FIXME */
297
298 #elif defined (__APPLE__)
299
300 #include <i386/user_ldt.h>
301
302 /* work around silly renaming of struct members in OS X 10.5 */
303 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
304 #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
305 #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
306 #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
307 #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
308 #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
309 #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
310 #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
311 #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
312 #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
313 #define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
314 #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
315 #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
316 #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
317 #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
318 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
319 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
320 #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
321 #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
322 #define FPU_sig(context) NULL
323 #define FPUX_sig(context) ((XSAVE_FORMAT *)&(context)->uc_mcontext->__fs.__fpu_fcw)
324 #define XState_sig(context) NULL /* FIXME */
325 #else
326 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
327 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
328 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
329 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
330 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
331 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
332 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
333 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
334 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
335 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
336 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
337 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
338 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
339 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
340 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
341 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
342 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
343 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
344 #define FPU_sig(context) NULL
345 #define FPUX_sig(context) ((XSAVE_FORMAT *)&(context)->uc_mcontext->fs.fpu_fcw)
346 #define XState_sig(context) NULL /* FIXME */
347 #endif
348
349 #elif defined(__NetBSD__)
350
351 #include <machine/segments.h>
352 #include <machine/sysarch.h>
353
354 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
355 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
356 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
357 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
358 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
359 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
360 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
361 #define ESP_sig(context) _UC_MACHINE_SP(context)
362
363 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
364 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
365 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
366 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
367 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
368 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
369
370 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
371 #define EIP_sig(context) _UC_MACHINE_PC(context)
372 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
373 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
374
375 #define FPU_sig(context) NULL
376 #define FPUX_sig(context) ((XSAVE_FORMAT *)&((context)->uc_mcontext.__fpregs))
377 #define XState_sig(context) NULL /* FIXME */
378
379 #define T_MCHK T_MCA
380 #define T_XMMFLT T_XMM
381
382 #elif defined(__GNU__)
383
384 #include <mach/i386/mach_i386.h>
385 #include <mach/mach_traps.h>
386
387 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
388 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
389 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
390 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
391 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
392 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
393 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
394 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
395
396 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
397 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
398 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
399 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
400 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
401 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
402
403 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
404 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
405 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
406 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
407
408 #define FPU_sig(context) ((FLOATING_SAVE_AREA *)&(context)->uc_mcontext.fpregs.fp_reg_set.fpchip_state)
409 #define FPUX_sig(context) NULL
410 #define XState_sig(context) NULL /* FIXME */
411
412 #else
413 #error You must define the signal context functions for your platform
414 #endif /* linux */
415
416 static ULONG first_ldt_entry = 32;
417
418 enum i386_trap_code
419 {
420 #if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
421 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
422 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
423 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
424 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
425 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
426 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
427 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
428 TRAP_x86_DNA = T_DNA, /* Device not available exception */
429 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
430 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
431 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
432 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
433 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
434 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
435 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
436 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
437 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
438 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
439 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
440 #else
441 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
442 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
443 TRAP_x86_NMI = 2, /* NMI interrupt */
444 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
445 TRAP_x86_OFLOW = 4, /* Overflow exception */
446 TRAP_x86_BOUND = 5, /* Bound range exception */
447 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
448 TRAP_x86_DNA = 7, /* Device not available exception */
449 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
450 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
451 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
452 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
453 TRAP_x86_STKFLT = 12, /* Stack fault */
454 TRAP_x86_PROTFLT = 13, /* General protection fault */
455 TRAP_x86_PAGEFLT = 14, /* Page fault */
456 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
457 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
458 TRAP_x86_MCHK = 18, /* Machine check exception */
459 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
460 otherwise Cache flush exception (via SIGSEV) */
461 #endif
462 };
463
464 struct syscall_xsave
465 {
466 union
467 {
468 XSAVE_FORMAT xsave;
469 FLOATING_SAVE_AREA fsave;
470 } u;
471 struct
472 {
473 ULONG64 mask;
474 ULONG64 compaction_mask;
475 ULONG64 reserved[6];
476 M128A ymm_high[8];
477 } xstate;
478 };
479
480 C_ASSERT( sizeof(struct syscall_xsave) == 0x2c0 );
481
482 struct syscall_frame
483 {
484 DWORD eflags; /* 00 */
485 DWORD eip; /* 04 */
486 DWORD esp; /* 08 */
487 WORD cs; /* 0c */
488 WORD ss; /* 0e */
489 WORD ds; /* 10 */
490 WORD es; /* 12 */
491 WORD fs; /* 14 */
492 WORD gs; /* 16 */
493 DWORD eax; /* 18 */
494 DWORD ebx; /* 1c */
495 DWORD ecx; /* 20 */
496 DWORD edx; /* 24 */
497 DWORD edi; /* 28 */
498 DWORD esi; /* 2c */
499 DWORD ebp; /* 30 */
500 };
501
502 C_ASSERT( sizeof(struct syscall_frame) == 0x34 );
503
504 struct x86_thread_data
505 {
506 DWORD fs; /* 1d4 TEB selector */
507 DWORD gs; /* 1d8 libc selector; update winebuild if you move this! */
508 DWORD dr0; /* 1dc debug registers */
509 DWORD dr1; /* 1e0 */
510 DWORD dr2; /* 1e4 */
511 DWORD dr3; /* 1e8 */
512 DWORD dr6; /* 1ec */
513 DWORD dr7; /* 1f0 */
514 void *exit_frame; /* 1f4 exit frame pointer */
515 struct syscall_frame *syscall_frame; /* 1f8 frame pointer on syscall entry */
516 };
517
518 C_ASSERT( sizeof(struct x86_thread_data) <= sizeof(((struct ntdll_thread_data *)0)->cpu_data) );
519 C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 );
520 C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 );
521 C_ASSERT( offsetof( TEB, GdiTebBatch ) + offsetof( struct x86_thread_data, syscall_frame ) == 0x1f8 );
522
523 static void *syscall_dispatcher;
524
525 static inline struct x86_thread_data *x86_thread_data(void)
526 {
527 return (struct x86_thread_data *)ntdll_get_thread_data()->cpu_data;
528 }
529
530 void *get_syscall_frame(void)
531 {
532 return x86_thread_data()->syscall_frame;
533 }
534
535 void set_syscall_frame(void *frame)
536 {
537 x86_thread_data()->syscall_frame = frame;
538 }
539
540 static struct syscall_xsave *get_syscall_xsave( struct syscall_frame *frame )
541 {
542 return (struct syscall_xsave *)((ULONG_PTR)((struct syscall_xsave *)frame - 1) & ~63);
543 }
544
545 static inline WORD get_cs(void) { WORD res; __asm__( "movw %%cs,%0" : "=r" (res) ); return res; }
546 static inline WORD get_ds(void) { WORD res; __asm__( "movw %%ds,%0" : "=r" (res) ); return res; }
547 static inline WORD get_fs(void) { WORD res; __asm__( "movw %%fs,%0" : "=r" (res) ); return res; }
548 static inline WORD get_gs(void) { WORD res; __asm__( "movw %%gs,%0" : "=r" (res) ); return res; }
549 static inline void set_fs( WORD val ) { __asm__( "mov %0,%%fs" :: "r" (val)); }
550 static inline void set_gs( WORD val ) { __asm__( "mov %0,%%gs" :: "r" (val)); }
551
552
553 /***********************************************************************
554 * unwind_builtin_dll
555 */
556 NTSTATUS CDECL unwind_builtin_dll( ULONG type, struct _DISPATCHER_CONTEXT *dispatch, CONTEXT *context )
557 {
558 return STATUS_UNSUCCESSFUL;
559 }
560
561
562 /***********************************************************************
563 * is_gdt_sel
564 */
565 static inline int is_gdt_sel( WORD sel )
566 {
567 return !(sel & 4);
568 }
569
570
571 /***********************************************************************
572 * ldt_is_system
573 */
574 static inline int ldt_is_system( WORD sel )
575 {
576 return is_gdt_sel( sel ) || ((sel >> 3) < first_ldt_entry);
577 }
578
579
580 /***********************************************************************
581 * get_current_teb
582 *
583 * Get the current teb based on the stack pointer.
584 */
585 static inline TEB *get_current_teb(void)
586 {
587 unsigned long esp;
588 __asm__("movl %%esp,%0" : "=g" (esp) );
589 return (TEB *)((esp & ~signal_stack_mask) + teb_offset);
590 }
591
592
593 #ifdef __sun
594
595 /* We have to workaround two Solaris breakages:
596 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
597 * code crash badly.
598 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
599 * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
600 */
601
602 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
603 __ASM_GLOBAL_FUNC( sigaction_syscall,
604 "movl $0x62,%eax\n\t"
605 "int $0x91\n\t"
606 "ret" )
607
608 /* assume the same libc handler is used for all signals */
609 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
610
611 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
612 {
613 struct x86_thread_data *thread_data;
614
615 __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
616
617 thread_data = (struct x86_thread_data *)get_current_teb()->GdiTebBatch;
618 set_fs( thread_data->fs );
619 set_gs( thread_data->gs );
620
621 libc_sigacthandler( signal, siginfo, sigcontext );
622 }
623
624 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
625 {
626 struct sigaction real_act;
627
628 if (sigaction( sig, new, old ) == -1) return -1;
629
630 /* retrieve the real handler and flags with a direct syscall */
631 sigaction_syscall( sig, NULL, &real_act );
632 libc_sigacthandler = real_act.sa_sigaction;
633 real_act.sa_sigaction = wine_sigacthandler;
634 sigaction_syscall( sig, &real_act, NULL );
635 return 0;
636 }
637 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
638
639 #endif
640
641 extern void clear_alignment_flag(void) DECLSPEC_HIDDEN;
642 __ASM_GLOBAL_FUNC( clear_alignment_flag,
643 "pushfl\n\t"
644 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
645 "andl $~0x40000,(%esp)\n\t"
646 "popfl\n\t"
647 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
648 "ret" )
649
650
651 /***********************************************************************
652 * init_handler
653 *
654 * Handler initialization when the full context is not needed.
655 * Return the stack pointer to use for pushing the exception data.
656 */
657 static inline void *init_handler( const ucontext_t *sigcontext )
658 {
659 TEB *teb = get_current_teb();
660
661 clear_alignment_flag();
662
663 #ifndef __sun /* see above for Solaris handling */
664 {
665 struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
666 set_fs( thread_data->fs );
667 set_gs( thread_data->gs );
668 }
669 #endif
670
671 if (!ldt_is_system(CS_sig(sigcontext)) || !ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
672 {
673 /*
674 * Win16 or DOS protected mode. Note that during switch
675 * from 16-bit mode to linear mode, CS may be set to system
676 * segment before FS is restored. Fortunately, in this case
677 * SS is still non-system segment. This is why both CS and SS
678 * are checked.
679 */
680 return teb->SystemReserved1[0];
681 }
682 return (void *)(ESP_sig(sigcontext) & ~3);
683 }
684
685
686 /***********************************************************************
687 * save_fpu
688 *
689 * Save the thread FPU context.
690 */
691 static inline void save_fpu( CONTEXT *context )
692 {
693 struct
694 {
695 DWORD ControlWord;
696 DWORD StatusWord;
697 DWORD TagWord;
698 DWORD ErrorOffset;
699 DWORD ErrorSelector;
700 DWORD DataOffset;
701 DWORD DataSelector;
702 }
703 float_status;
704
705 context->ContextFlags |= CONTEXT_FLOATING_POINT;
706 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
707
708 /* Reset unmasked exceptions status to avoid firing an exception. */
709 memcpy(&float_status, &context->FloatSave, sizeof(float_status));
710 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
711
712 __asm__ __volatile__( "fldenv %0" : : "m" (float_status) );
713 }
714
715
716 /***********************************************************************
717 * restore_fpu
718 *
719 * Restore the x87 FPU context
720 */
721 static inline void restore_fpu( const CONTEXT *context )
722 {
723 FLOATING_SAVE_AREA float_status = context->FloatSave;
724 /* reset the current interrupt status */
725 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
726 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
727 }
728
729
730 /***********************************************************************
731 * fpux_to_fpu
732 *
733 * Build a standard FPU context from an extended one.
734 */
735 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XSAVE_FORMAT *fpux )
736 {
737 unsigned int i, tag, stack_top;
738
739 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
740 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
741 fpu->ErrorOffset = fpux->ErrorOffset;
742 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
743 fpu->DataOffset = fpux->DataOffset;
744 fpu->DataSelector = fpux->DataSelector;
745 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
746
747 stack_top = (fpux->StatusWord >> 11) & 7;
748 fpu->TagWord = 0xffff0000;
749 for (i = 0; i < 8; i++)
750 {
751 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
752 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
753 else
754 {
755 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
756 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
757 {
758 tag = 2; /* special */
759 }
760 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
761 {
762 if (reg->Low) tag = 2; /* special */
763 else tag = 1; /* zero */
764 }
765 else
766 {
767 if (reg->Low >> 63) tag = 0; /* valid */
768 else tag = 2; /* special */
769 }
770 }
771 fpu->TagWord |= tag << (2 * i);
772 }
773 }
774
775
776 /***********************************************************************
777 * fpu_to_fpux
778 *
779 * Fill extended FPU context from standard one.
780 */
781 static void fpu_to_fpux( XSAVE_FORMAT *fpux, const FLOATING_SAVE_AREA *fpu )
782 {
783 unsigned int i;
784
785 fpux->ControlWord = fpu->ControlWord;
786 fpux->StatusWord = fpu->StatusWord;
787 fpux->ErrorOffset = fpu->ErrorOffset;
788 fpux->ErrorSelector = fpu->ErrorSelector;
789 fpux->ErrorOpcode = fpu->ErrorSelector >> 16;
790 fpux->DataOffset = fpu->DataOffset;
791 fpux->DataSelector = fpu->DataSelector;
792 fpux->TagWord = 0;
793 for (i = 0; i < 8; i++)
794 {
795 if (((fpu->TagWord >> (i * 2)) & 3) != 3)
796 fpux->TagWord |= 1 << i;
797 memcpy( &fpux->FloatRegisters[i], &fpu->RegisterArea[10 * i], 10 );
798 }
799 }
800
801
802 /***********************************************************************
803 * save_context
804 *
805 * Build a context structure from the signal info.
806 */
807 static inline void save_context( struct xcontext *xcontext, const ucontext_t *sigcontext )
808 {
809 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
810 XSAVE_FORMAT *fpux = FPUX_sig(sigcontext);
811 CONTEXT *context = &xcontext->c;
812
813 memset(context, 0, sizeof(*context));
814 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
815 context->Eax = EAX_sig(sigcontext);
816 context->Ebx = EBX_sig(sigcontext);
817 context->Ecx = ECX_sig(sigcontext);
818 context->Edx = EDX_sig(sigcontext);
819 context->Esi = ESI_sig(sigcontext);
820 context->Edi = EDI_sig(sigcontext);
821 context->Ebp = EBP_sig(sigcontext);
822 context->EFlags = EFL_sig(sigcontext);
823 context->Eip = EIP_sig(sigcontext);
824 context->Esp = ESP_sig(sigcontext);
825 context->SegCs = LOWORD(CS_sig(sigcontext));
826 context->SegDs = LOWORD(DS_sig(sigcontext));
827 context->SegEs = LOWORD(ES_sig(sigcontext));
828 context->SegFs = LOWORD(FS_sig(sigcontext));
829 context->SegGs = LOWORD(GS_sig(sigcontext));
830 context->SegSs = LOWORD(SS_sig(sigcontext));
831 context->Dr0 = x86_thread_data()->dr0;
832 context->Dr1 = x86_thread_data()->dr1;
833 context->Dr2 = x86_thread_data()->dr2;
834 context->Dr3 = x86_thread_data()->dr3;
835 context->Dr6 = x86_thread_data()->dr6;
836 context->Dr7 = x86_thread_data()->dr7;
837
838 if (fpu)
839 {
840 context->ContextFlags |= CONTEXT_FLOATING_POINT;
841 context->FloatSave = *fpu;
842 }
843 if (fpux)
844 {
845 XSTATE *xs;
846
847 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
848 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
849 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
850 if ((cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX) && (xs = XState_sig(fpux)))
851 {
852 context_init_xstate( context, xs );
853 xcontext->host_compaction_mask = xs->CompactionMask;
854 }
855 }
856 if (!fpu && !fpux) save_fpu( context );
857 }
858
859
860 /***********************************************************************
861 * restore_context
862 *
863 * Restore the signal info from the context.
864 */
865 static inline void restore_context( const struct xcontext *xcontext, ucontext_t *sigcontext )
866 {
867 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
868 XSAVE_FORMAT *fpux = FPUX_sig(sigcontext);
869 const CONTEXT *context = &xcontext->c;
870
871 x86_thread_data()->dr0 = context->Dr0;
872 x86_thread_data()->dr1 = context->Dr1;
873 x86_thread_data()->dr2 = context->Dr2;
874 x86_thread_data()->dr3 = context->Dr3;
875 x86_thread_data()->dr6 = context->Dr6;
876 x86_thread_data()->dr7 = context->Dr7;
877 EAX_sig(sigcontext) = context->Eax;
878 EBX_sig(sigcontext) = context->Ebx;
879 ECX_sig(sigcontext) = context->Ecx;
880 EDX_sig(sigcontext) = context->Edx;
881 ESI_sig(sigcontext) = context->Esi;
882 EDI_sig(sigcontext) = context->Edi;
883 EBP_sig(sigcontext) = context->Ebp;
884 EFL_sig(sigcontext) = context->EFlags;
885 EIP_sig(sigcontext) = context->Eip;
886 ESP_sig(sigcontext) = context->Esp;
887 CS_sig(sigcontext) = context->SegCs;
888 DS_sig(sigcontext) = context->SegDs;
889 ES_sig(sigcontext) = context->SegEs;
890 FS_sig(sigcontext) = context->SegFs;
891 GS_sig(sigcontext) = context->SegGs;
892 SS_sig(sigcontext) = context->SegSs;
893
894 if (fpu) *fpu = context->FloatSave;
895 if (fpux)
896 {
897 XSTATE *src_xs, *dst_xs;
898
899 memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
900
901 if ((dst_xs = XState_sig(fpux)) && (src_xs = xstate_from_context( context )))
902 {
903 memcpy( &dst_xs->YmmContext, &src_xs->YmmContext, sizeof(dst_xs->YmmContext) );
904 dst_xs->Mask |= src_xs->Mask;
905 dst_xs->CompactionMask = xcontext->host_compaction_mask;
906 }
907 }
908 if (!fpu && !fpux) restore_fpu( context );
909 }
910
911
912 /***********************************************************************
913 * set_full_cpu_context
914 *
915 * Set the new CPU context.
916 */
917 extern void set_full_cpu_context(void) DECLSPEC_HIDDEN;
918 __ASM_GLOBAL_FUNC( set_full_cpu_context,
919 "movl %fs:0x1f8,%ecx\n\t"
920 "movl $0,%fs:0x1f8\n\t" /* x86_thread_data()->syscall_frame = NULL */
921 "movw 0x16(%ecx),%gs\n\t" /* SegGs */
922 "movw 0x14(%ecx),%fs\n\t" /* SegFs */
923 "movw 0x12(%ecx),%es\n\t" /* SegEs */
924 "movl 0x1c(%ecx),%ebx\n\t" /* Ebx */
925 "movl 0x28(%ecx),%edi\n\t" /* Edi */
926 "movl 0x2c(%ecx),%esi\n\t" /* Esi */
927 "movl 0x30(%ecx),%ebp\n\t" /* Ebp */
928 "movw %ss,%ax\n\t"
929 "cmpw 0x0e(%ecx),%ax\n\t" /* SegSs */
930 "jne 1f\n\t"
931 /* As soon as we have switched stacks the context structure could
932 * be invalid (when signal handlers are executed for example). Copy
933 * values on the target stack before changing ESP. */
934 "movl 0x08(%ecx),%eax\n\t" /* Esp */
935 "leal -4*4(%eax),%eax\n\t"
936 "movl (%ecx),%edx\n\t" /* EFlags */
937 "movl %edx,3*4(%eax)\n\t"
938 "movl 0x0c(%ecx),%edx\n\t" /* SegCs */
939 "movl %edx,2*4(%eax)\n\t"
940 "movl 0x04(%ecx),%edx\n\t" /* Eip */
941 "movl %edx,1*4(%eax)\n\t"
942 "movl 0x18(%ecx),%edx\n\t" /* Eax */
943 "movl %edx,0*4(%eax)\n\t"
944 "pushl 0x10(%ecx)\n\t" /* SegDs */
945 "movl 0x24(%ecx),%edx\n\t" /* Edx */
946 "movl 0x20(%ecx),%ecx\n\t" /* Ecx */
947 "popl %ds\n\t"
948 "movl %eax,%esp\n\t"
949 "popl %eax\n\t"
950 "iret\n"
951 /* Restore the context when the stack segment changes. We can't use
952 * the same code as above because we do not know if the stack segment
953 * is 16 or 32 bit, and 'movl' will throw an exception when we try to
954 * access memory above the limit. */
955 "1:\n\t"
956 "movl 0x24(%ecx),%edx\n\t" /* Edx */
957 "movl 0x18(%ecx),%eax\n\t" /* Eax */
958 "movw 0x0e(%ecx),%ss\n\t" /* SegSs */
959 "movl 0x08(%ecx),%esp\n\t" /* Esp */
960 "pushl 0x00(%ecx)\n\t" /* EFlags */
961 "pushl 0x0c(%ecx)\n\t" /* SegCs */
962 "pushl 0x04(%ecx)\n\t" /* Eip */
963 "pushl 0x10(%ecx)\n\t" /* SegDs */
964 "movl 0x20(%ecx),%ecx\n\t" /* Ecx */
965 "popl %ds\n\t"
966 "iret" )
967
968
969 /***********************************************************************
970 * signal_restore_full_cpu_context
971 *
972 * Restore full context from syscall frame
973 */
974 void signal_restore_full_cpu_context(void)
975 {
976 struct syscall_xsave *xsave = get_syscall_xsave( get_syscall_frame() );
977
978 if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_XSAVE)
979 {
980 __asm__ volatile( "xrstor %0" : : "m"(*xsave), "a" (7), "d" (0) );
981 }
982 else if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR)
983 {
984 __asm__ volatile( "fxrstor %0" : : "m"(xsave->u.xsave) );
985 }
986 else
987 {
988 __asm__ volatile( "frstor %0; fwait" : : "m" (xsave->u.fsave) );
989 }
990 set_full_cpu_context();
991 }
992
993
994 /***********************************************************************
995 * NtSetContextThread (NTDLL.@)
996 * ZwSetContextThread (NTDLL.@)
997 */
998 NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
999 {
1000 NTSTATUS ret = STATUS_SUCCESS;
1001 struct syscall_frame *frame = x86_thread_data()->syscall_frame;
1002 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1003 BOOL self = (handle == GetCurrentThread());
1004 XSTATE *xs;
1005
1006 /* debug registers require a server call */
1007 if (self && (flags & CONTEXT_DEBUG_REGISTERS))
1008 self = (x86_thread_data()->dr0 == context->Dr0 &&
1009 x86_thread_data()->dr1 == context->Dr1 &&
1010 x86_thread_data()->dr2 == context->Dr2 &&
1011 x86_thread_data()->dr3 == context->Dr3 &&
1012 x86_thread_data()->dr6 == context->Dr6 &&
1013 x86_thread_data()->dr7 == context->Dr7);
1014
1015 if (!self)
1016 {
1017 ret = set_thread_context( handle, context, &self, IMAGE_FILE_MACHINE_I386 );
1018 if (ret || !self) return ret;
1019 if (flags & CONTEXT_DEBUG_REGISTERS)
1020 {
1021 x86_thread_data()->dr0 = context->Dr0;
1022 x86_thread_data()->dr1 = context->Dr1;
1023 x86_thread_data()->dr2 = context->Dr2;
1024 x86_thread_data()->dr3 = context->Dr3;
1025 x86_thread_data()->dr6 = context->Dr6;
1026 x86_thread_data()->dr7 = context->Dr7;
1027 }
1028 }
1029
1030 if (flags & CONTEXT_INTEGER)
1031 {
1032 frame->eax = context->Eax;
1033 frame->ebx = context->Ebx;
1034 frame->ecx = context->Ecx;
1035 frame->edx = context->Edx;
1036 frame->esi = context->Esi;
1037 frame->edi = context->Edi;
1038 }
1039 if (flags & CONTEXT_CONTROL)
1040 {
1041 frame->esp = context->Esp;
1042 frame->ebp = context->Ebp;
1043 frame->eip = context->Eip;
1044 frame->eflags = context->EFlags;
1045 frame->cs = context->SegCs;
1046 frame->ss = context->SegSs;
1047 }
1048 if (flags & CONTEXT_SEGMENTS)
1049 {
1050 frame->ds = context->SegDs;
1051 frame->es = context->SegEs;
1052 frame->fs = context->SegFs;
1053 frame->gs = context->SegGs;
1054 }
1055 if (flags & CONTEXT_EXTENDED_REGISTERS)
1056 {
1057 struct syscall_xsave *xsave = get_syscall_xsave( frame );
1058 memcpy( &xsave->u.xsave, context->ExtendedRegisters, sizeof(xsave->u.xsave) );
1059 /* reset the current interrupt status */
1060 xsave->u.xsave.StatusWord &= xsave->u.xsave.ControlWord | 0xff80;
1061 xsave->xstate.mask |= XSTATE_MASK_LEGACY;
1062 }
1063 else if (flags & CONTEXT_FLOATING_POINT)
1064 {
1065 struct syscall_xsave *xsave = get_syscall_xsave( frame );
1066 if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR)
1067 {
1068 fpu_to_fpux( &xsave->u.xsave, &context->FloatSave );
1069 }
1070 else
1071 {
1072 xsave->u.fsave = context->FloatSave;
1073 }
1074 xsave->xstate.mask |= XSTATE_MASK_LEGACY_FLOATING_POINT;
1075 }
1076 if ((cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX) && (xs = xstate_from_context( context )))
1077 {
1078 struct syscall_xsave *xsave = get_syscall_xsave( frame );
1079 CONTEXT_EX *context_ex = (CONTEXT_EX *)(context + 1);
1080
1081 if (context_ex->XState.Length < offsetof(XSTATE, YmmContext)
1082 || context_ex->XState.Length > sizeof(XSTATE))
1083 return STATUS_INVALID_PARAMETER;
1084
1085 if (xs->Mask & XSTATE_MASK_GSSE)
1086 {
1087 if (context_ex->XState.Length < sizeof(XSTATE))
1088 return STATUS_BUFFER_OVERFLOW;
1089
1090 xsave->xstate.mask |= XSTATE_MASK_GSSE;
1091 memcpy( &xsave->xstate.ymm_high, &xs->YmmContext, sizeof(xsave->xstate.ymm_high) );
1092 }
1093 else
1094 xsave->xstate.mask &= ~XSTATE_MASK_GSSE;
1095 }
1096
1097 return STATUS_SUCCESS;
1098 }
1099
1100
1101 /***********************************************************************
1102 * NtGetContextThread (NTDLL.@)
1103 * ZwGetContextThread (NTDLL.@)
1104 *
1105 * Note: we use a small assembly wrapper to save the necessary registers
1106 * in case we are fetching the context of the current thread.
1107 */
1108 NTSTATUS WINAPI NtGetContextThread( HANDLE handle, CONTEXT *context )
1109 {
1110 struct syscall_frame *frame = x86_thread_data()->syscall_frame;
1111 DWORD needed_flags = context->ContextFlags & ~CONTEXT_i386;
1112 BOOL self = (handle == GetCurrentThread());
1113 NTSTATUS ret;
1114
1115 /* debug registers require a server call */
1116 if (needed_flags & CONTEXT_DEBUG_REGISTERS) self = FALSE;
1117
1118 if (!self)
1119 {
1120 if ((ret = get_thread_context( handle, context, &self, IMAGE_FILE_MACHINE_I386 ))) return ret;
1121 needed_flags &= ~context->ContextFlags;
1122 }
1123
1124 if (self)
1125 {
1126 struct syscall_xsave *xsave = get_syscall_xsave( frame );
1127 XSTATE *xstate;
1128 if (needed_flags & CONTEXT_INTEGER)
1129 {
1130 context->Eax = frame->eax;
1131 context->Ebx = frame->ebx;
1132 context->Ecx = frame->ecx;
1133 context->Edx = frame->edx;
1134 context->Esi = frame->esi;
1135 context->Edi = frame->edi;
1136 context->ContextFlags |= CONTEXT_INTEGER;
1137 }
1138 if (needed_flags & CONTEXT_CONTROL)
1139 {
1140 context->Esp = frame->esp;
1141 context->Ebp = frame->ebp;
1142 context->Eip = frame->eip;
1143 context->EFlags = frame->eflags;
1144 context->SegCs = frame->cs;
1145 context->SegSs = frame->ss;
1146 context->ContextFlags |= CONTEXT_CONTROL;
1147 }
1148 if (needed_flags & CONTEXT_SEGMENTS)
1149 {
1150 context->SegDs = frame->ds;
1151 context->SegEs = frame->es;
1152 context->SegFs = frame->fs;
1153 context->SegGs = frame->gs;
1154 context->ContextFlags |= CONTEXT_SEGMENTS;
1155 }
1156 if (needed_flags & CONTEXT_FLOATING_POINT)
1157 {
1158 if (!(cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR))
1159 {
1160 context->FloatSave = xsave->u.fsave;
1161 }
1162 else if (!xstate_compaction_enabled ||
1163 (xsave->xstate.mask & XSTATE_MASK_LEGACY_FLOATING_POINT))
1164 {
1165 fpux_to_fpu( &context->FloatSave, &xsave->u.xsave );
1166 }
1167 else
1168 {
1169 memset( &context->FloatSave, 0, sizeof(context->FloatSave) );
1170 context->FloatSave.ControlWord = 0x37f;
1171 }
1172 context->ContextFlags |= CONTEXT_FLOATING_POINT;
1173 }
1174 if (needed_flags & CONTEXT_EXTENDED_REGISTERS)
1175 {
1176 XSAVE_FORMAT *xs = (XSAVE_FORMAT *)context->ExtendedRegisters;
1177
1178 if (!xstate_compaction_enabled ||
1179 (xsave->xstate.mask & XSTATE_MASK_LEGACY_FLOATING_POINT))
1180 {
1181 memcpy( xs, &xsave->u.xsave, FIELD_OFFSET( XSAVE_FORMAT, MxCsr ));
1182 memcpy( xs->FloatRegisters, xsave->u.xsave.FloatRegisters,
1183 sizeof( xs->FloatRegisters ));
1184 }
1185 else
1186 {
1187 memset( xs, 0, FIELD_OFFSET( XSAVE_FORMAT, MxCsr ));
1188 memset( xs->FloatRegisters, 0, sizeof( xs->FloatRegisters ));
1189 xs->ControlWord = 0x37f;
1190 }
1191
1192 if (!xstate_compaction_enabled || (xsave->xstate.mask & XSTATE_MASK_LEGACY_SSE))
1193 {
1194 memcpy( xs->XmmRegisters, xsave->u.xsave.XmmRegisters, sizeof( xs->XmmRegisters ));
1195 xs->MxCsr = xsave->u.xsave.MxCsr;
1196 xs->MxCsr_Mask = xsave->u.xsave.MxCsr_Mask;
1197 }
1198 else
1199 {
1200 memset( xs->XmmRegisters, 0, sizeof( xs->XmmRegisters ));
1201 xs->MxCsr = 0x1f80;
1202 xs->MxCsr_Mask = 0x2ffff;
1203 }
1204
1205 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
1206 }
1207 /* update the cached version of the debug registers */
1208 if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386))
1209 {
1210 x86_thread_data()->dr0 = context->Dr0;
1211 x86_thread_data()->dr1 = context->Dr1;
1212 x86_thread_data()->dr2 = context->Dr2;
1213 x86_thread_data()->dr3 = context->Dr3;
1214 x86_thread_data()->dr6 = context->Dr6;
1215 x86_thread_data()->dr7 = context->Dr7;
1216 }
1217 if ((cpu_info.ProcessorFeatureBits & CPU_FEATURE_AVX) && (xstate = xstate_from_context( context )))
1218 {
1219 struct syscall_xsave *xsave = get_syscall_xsave( frame );
1220 CONTEXT_EX *context_ex = (CONTEXT_EX *)(context + 1);
1221 unsigned int mask;
1222
1223 if (context_ex->XState.Length < offsetof(XSTATE, YmmContext)
1224 || context_ex->XState.Length > sizeof(XSTATE))
1225 return STATUS_INVALID_PARAMETER;
1226
1227 mask = (xstate_compaction_enabled ? xstate->CompactionMask : xstate->Mask) & XSTATE_MASK_GSSE;
1228 xstate->Mask = xsave->xstate.mask & mask;
1229 xstate->CompactionMask = xstate_compaction_enabled ? (0x8000000000000000 | mask) : 0;
1230 memset( xstate->Reserved, 0, sizeof(xstate->Reserved) );
1231 if (xstate->Mask)
1232 {
1233 if (context_ex->XState.Length < sizeof(XSTATE))
1234 return STATUS_BUFFER_OVERFLOW;
1235
1236 memcpy( &xstate->YmmContext, xsave->xstate.ymm_high, sizeof(xsave->xstate.ymm_high) );
1237 }
1238 }
1239 }
1240
1241 if (context->ContextFlags & (CONTEXT_INTEGER & ~CONTEXT_i386))
1242 TRACE( "%p: eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n", handle,
1243 context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi );
1244 if (context->ContextFlags & (CONTEXT_CONTROL & ~CONTEXT_i386))
1245 TRACE( "%p: ebp=%08x esp=%08x eip=%08x cs=%04x ss=%04x flags=%08x\n", handle,
1246 context->Ebp, context->Esp, context->Eip, context->SegCs, context->SegSs, context->EFlags );
1247 if (context->ContextFlags & (CONTEXT_SEGMENTS & ~CONTEXT_i386))
1248 TRACE( "%p: ds=%04x es=%04x fs=%04x gs=%04x\n", handle,
1249 context->SegDs, context->SegEs, context->SegFs, context->SegGs );
1250 if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386))
1251 TRACE( "%p: dr0=%08x dr1=%08x dr2=%08x dr3=%08x dr6=%08x dr7=%08x\n", handle,
1252 context->Dr0, context->Dr1, context->Dr2, context->Dr3, context->Dr6, context->Dr7 );
1253
1254 return STATUS_SUCCESS;
1255 }
1256
1257
1258 /***********************************************************************
1259 * set_thread_wow64_context
1260 */
1261 NTSTATUS set_thread_wow64_context( HANDLE handle, const void *ctx, ULONG size )
1262 {
1263 return STATUS_INVALID_INFO_CLASS;
1264 }
1265
1266
1267 /***********************************************************************
1268 * get_thread_wow64_context
1269 */
1270 NTSTATUS get_thread_wow64_context( HANDLE handle, void *ctx, ULONG size )
1271 {
1272 return STATUS_INVALID_INFO_CLASS;
1273 }
1274
1275
1276 /***********************************************************************
1277 * is_privileged_instr
1278 *
1279 * Check if the fault location is a privileged instruction.
1280 * Based on the instruction emulation code in dlls/kernel/instr.c.
1281 */
1282 static inline DWORD is_privileged_instr( CONTEXT *context )
1283 {
1284 BYTE instr[16];
1285 unsigned int i, len, prefix_count = 0;
1286
1287 if (!ldt_is_system( context->SegCs )) return 0;
1288 len = virtual_uninterrupted_read_memory( (BYTE *)context->Eip, instr, sizeof(instr) );
1289
1290 for (i = 0; i < len; i++) switch (instr[i])
1291 {
1292 /* instruction prefixes */
1293 case 0x2e: /* %cs: */
1294 case 0x36: /* %ss: */
1295 case 0x3e: /* %ds: */
1296 case 0x26: /* %es: */
1297 case 0x64: /* %fs: */
1298 case 0x65: /* %gs: */
1299 case 0x66: /* opcode size */
1300 case 0x67: /* addr size */
1301 case 0xf0: /* lock */
1302 case 0xf2: /* repne */
1303 case 0xf3: /* repe */
1304 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1305 continue;
1306
1307 case 0x0f: /* extended instruction */
1308 if (i == len - 1) return 0;
1309 switch(instr[i + 1])
1310 {
1311 case 0x20: /* mov crX, reg */
1312 case 0x21: /* mov drX, reg */
1313 case 0x22: /* mov reg, crX */
1314 case 0x23: /* mov reg drX */
1315 return EXCEPTION_PRIV_INSTRUCTION;
1316 }
1317 return 0;
1318 case 0x6c: /* insb (%dx) */
1319 case 0x6d: /* insl (%dx) */
1320 case 0x6e: /* outsb (%dx) */
1321 case 0x6f: /* outsl (%dx) */
1322 case 0xcd: /* int $xx */
1323 case 0xe4: /* inb al,XX */
1324 case 0xe5: /* in (e)ax,XX */
1325 case 0xe6: /* outb XX,al */
1326 case 0xe7: /* out XX,(e)ax */
1327 case 0xec: /* inb (%dx),%al */
1328 case 0xed: /* inl (%dx),%eax */
1329 case 0xee: /* outb %al,(%dx) */
1330 case 0xef: /* outl %eax,(%dx) */
1331 case 0xf4: /* hlt */
1332 case 0xfa: /* cli */
1333 case 0xfb: /* sti */
1334 return EXCEPTION_PRIV_INSTRUCTION;
1335 default:
1336 return 0;
1337 }
1338 return 0;
1339 }
1340
1341
1342 /***********************************************************************
1343 * check_invalid_gs
1344 *
1345 * Check for fault caused by invalid %gs value (some copy protection schemes mess with it).
1346 */
1347 static inline BOOL check_invalid_gs( ucontext_t *sigcontext, CONTEXT *context )
1348 {
1349 unsigned int prefix_count = 0;
1350 const BYTE *instr = (BYTE *)context->Eip;
1351 WORD system_gs = x86_thread_data()->gs;
1352
1353 if (context->SegGs == system_gs) return FALSE;
1354 if (!ldt_is_system( context->SegCs )) return FALSE;
1355 /* only handle faults in system libraries */
1356 if (virtual_is_valid_code_address( instr, 1 )) return FALSE;
1357
1358 for (;;) switch(*instr)
1359 {
1360 /* instruction prefixes */
1361 case 0x2e: /* %cs: */
1362 case 0x36: /* %ss: */
1363 case 0x3e: /* %ds: */
1364 case 0x26: /* %es: */
1365 case 0x64: /* %fs: */
1366 case 0x66: /* opcode size */
1367 case 0x67: /* addr size */
1368 case 0xf0: /* lock */
1369 case 0xf2: /* repne */
1370 case 0xf3: /* repe */
1371 if (++prefix_count >= 15) return FALSE;
1372 instr++;
1373 continue;
1374 case 0x65: /* %gs: */
1375 TRACE( "%04x/%04x at %p, fixing up\n", context->SegGs, system_gs, instr );
1376 GS_sig(sigcontext) = system_gs;
1377 return TRUE;
1378 default:
1379 return FALSE;
1380 }
1381 }
1382
1383
1384 #include "pshpack1.h"
1385 union atl_thunk
1386 {
1387 struct
1388 {
1389 DWORD movl; /* movl this,4(%esp) */
1390 DWORD this;
1391 BYTE jmp; /* jmp func */
1392 int func;
1393 } t1;
1394 struct
1395 {
1396 BYTE movl; /* movl this,ecx */
1397 DWORD this;
1398 BYTE jmp; /* jmp func */
1399 int func;
1400 } t2;
1401 struct
1402 {
1403 BYTE movl1; /* movl this,edx */
1404 DWORD this;
1405 BYTE movl2; /* movl func,ecx */
1406 DWORD func;
1407 WORD jmp; /* jmp ecx */
1408 } t3;
1409 struct
1410 {
1411 BYTE movl1; /* movl this,ecx */
1412 DWORD this;
1413 BYTE movl2; /* movl func,eax */
1414 DWORD func;
1415 WORD jmp; /* jmp eax */
1416 } t4;
1417 struct
1418 {
1419 DWORD inst1; /* pop ecx
1420 * pop eax
1421 * push ecx
1422 * jmp 4(%eax) */
1423 WORD inst2;
1424 } t5;
1425 };
1426 #include "poppack.h"
1427
1428 /**********************************************************************
1429 * check_atl_thunk
1430 *
1431 * Check if code destination is an ATL thunk, and emulate it if so.
1432 */
1433 static BOOL check_atl_thunk( ucontext_t *sigcontext, EXCEPTION_RECORD *rec, CONTEXT *context )
1434 {
1435 const union atl_thunk *thunk = (const union atl_thunk *)rec->ExceptionInformation[1];
1436 union atl_thunk thunk_copy;
1437 SIZE_T thunk_len;
1438
1439 thunk_len = virtual_uninterrupted_read_memory( thunk, &thunk_copy, sizeof(*thunk) );
1440 if (!thunk_len) return FALSE;
1441
1442 if (thunk_len >= sizeof(thunk_copy.t1) && thunk_copy.t1.movl == 0x042444c7 &&
1443 thunk_copy.t1.jmp == 0xe9)
1444 {
1445 if (!virtual_uninterrupted_write_memory( (DWORD *)context->Esp + 1,
1446 &thunk_copy.t1.this, sizeof(DWORD) ))
1447 {
1448 EIP_sig(sigcontext) = (DWORD_PTR)(&thunk->t1.func + 1) + thunk_copy.t1.func;
1449 TRACE( "emulating ATL thunk type 1 at %p, func=%08x arg=%08x\n",
1450 thunk, EIP_sig(sigcontext), thunk_copy.t1.this );
1451 return TRUE;
1452 }
1453 }
1454 else if (thunk_len >= sizeof(thunk_copy.t2) && thunk_copy.t2.movl == 0xb9 &&
1455 thunk_copy.t2.jmp == 0xe9)
1456 {
1457 ECX_sig(sigcontext) = thunk_copy.t2.this;
1458 EIP_sig(sigcontext) = (DWORD_PTR)(&thunk->t2.func + 1) + thunk_copy.t2.func;
1459 TRACE( "emulating ATL thunk type 2 at %p, func=%08x ecx=%08x\n",
1460 thunk, EIP_sig(sigcontext), ECX_sig(sigcontext) );
1461 return TRUE;
1462 }
1463 else if (thunk_len >= sizeof(thunk_copy.t3) && thunk_copy.t3.movl1 == 0xba &&
1464 thunk_copy.t3.movl2 == 0xb9 &&
1465 thunk_copy.t3.jmp == 0xe1ff)
1466 {
1467 EDX_sig(sigcontext) = thunk_copy.t3.this;
1468 ECX_sig(sigcontext) = thunk_copy.t3.func;
1469 EIP_sig(sigcontext) = thunk_copy.t3.func;
1470 TRACE( "emulating ATL thunk type 3 at %p, func=%08x ecx=%08x edx=%08x\n",
1471 thunk, EIP_sig(sigcontext), ECX_sig(sigcontext), EDX_sig(sigcontext) );
1472 return TRUE;
1473 }
1474 else if (thunk_len >= sizeof(thunk_copy.t4) && thunk_copy.t4.movl1 == 0xb9 &&
1475 thunk_copy.t4.movl2 == 0xb8 &&
1476 thunk_copy.t4.jmp == 0xe0ff)
1477 {
1478 ECX_sig(sigcontext) = thunk_copy.t4.this;
1479 EAX_sig(sigcontext) = thunk_copy.t4.func;
1480 EIP_sig(sigcontext) = thunk_copy.t4.func;
1481 TRACE( "emulating ATL thunk type 4 at %p, func=%08x eax=%08x ecx=%08x\n",
1482 thunk, EIP_sig(sigcontext), EAX_sig(sigcontext), ECX_sig(sigcontext) );
1483 return TRUE;
1484 }
1485 else if (thunk_len >= sizeof(thunk_copy.t5) && thunk_copy.t5.inst1 == 0xff515859 &&
1486 thunk_copy.t5.inst2 == 0x0460)
1487 {
1488 DWORD func, sp[2];
1489 if (virtual_uninterrupted_read_memory( (DWORD *)context->Esp, sp, sizeof(sp) ) == sizeof(sp) &&
1490 virtual_uninterrupted_read_memory( (DWORD *)sp[1] + 1, &func, sizeof(DWORD) ) == sizeof(DWORD) &&
1491 !virtual_uninterrupted_write_memory( (DWORD *)context->Esp + 1, &sp[0], sizeof(sp[0]) ))
1492 {
1493 ECX_sig(sigcontext) = sp[0];
1494 EAX_sig(sigcontext) = sp[1];
1495 ESP_sig(sigcontext) += sizeof(DWORD);
1496 EIP_sig(sigcontext) = func;
1497 TRACE( "emulating ATL thunk type 5 at %p, func=%08x eax=%08x ecx=%08x esp=%08x\n",
1498 thunk, EIP_sig(sigcontext), EAX_sig(sigcontext),
1499 ECX_sig(sigcontext), ESP_sig(sigcontext) );
1500 return TRUE;
1501 }
1502 }
1503
1504 return FALSE;
1505 }
1506
1507
1508 /***********************************************************************
1509 * setup_exception_record
1510 *
1511 * Setup the exception record and context on the thread stack.
1512 */
1513 static void *setup_exception_record( ucontext_t *sigcontext, EXCEPTION_RECORD *rec, struct xcontext *xcontext )
1514 {
1515 void *stack = init_handler( sigcontext );
1516
1517 rec->ExceptionAddress = (void *)EIP_sig( sigcontext );
1518 save_context( xcontext, sigcontext );
1519 return stack;
1520 }
1521
1522 /***********************************************************************
1523 * setup_raise_exception
1524 *
1525 * Change context to setup a call to a raise exception function.
1526 */
1527 static void setup_raise_exception( ucontext_t *sigcontext, void *stack_ptr,
1528 EXCEPTION_RECORD *rec, struct xcontext *xcontext )
1529 {
1530 CONTEXT *context = &xcontext->c;
1531 size_t stack_size;
1532 XSTATE *src_xs;
1533
1534 struct stack_layout
1535 {
1536 EXCEPTION_RECORD *rec_ptr; /* first arg for KiUserExceptionDispatcher */
1537 CONTEXT *context_ptr; /* second arg for KiUserExceptionDispatcher */
1538 CONTEXT context;
1539 CONTEXT_EX context_ex;
1540 EXCEPTION_RECORD rec;
1541 DWORD ebp;
1542 DWORD eip;
1543 char xstate[0];
1544 } *stack;
1545
1546 C_ASSERT( (offsetof(struct stack_layout, xstate) == sizeof(struct stack_layout)) );
1547
1548 NTSTATUS status = send_debug_event( rec, context, TRUE );
1549
1550 if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
1551 {
1552 restore_context( xcontext, sigcontext );
1553 return;
1554 }
1555
1556 /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
1557 if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
1558
1559 stack_size = sizeof(*stack);
1560 if ((src_xs = xstate_from_context( context )))
1561 {
1562 stack_size += (ULONG_PTR)stack_ptr - (((ULONG_PTR)stack_ptr
1563 - sizeof(XSTATE)) & ~(ULONG_PTR)63);
1564 }
1565
1566 stack = virtual_setup_exception( stack_ptr, stack_size, rec );
1567 stack->rec = *rec;
1568 stack->context = *context;
1569
1570 if (src_xs)
1571 {
1572 XSTATE *dst_xs = (XSTATE *)stack->xstate;
1573
1574 assert(!((ULONG_PTR)dst_xs & 63));
1575 context_init_xstate( &stack->context, stack->xstate );
1576 memset( dst_xs, 0, offsetof(XSTATE, YmmContext) );
1577 dst_xs->CompactionMask = xstate_compaction_enabled ? 0x8000000000000004 : 0;
1578 if (src_xs->Mask & 4)
1579 {
1580 dst_xs->Mask = 4;
1581 memcpy( &dst_xs->YmmContext, &src_xs->YmmContext, sizeof(dst_xs->YmmContext) );
1582 }
1583 }
1584
1585 stack->rec_ptr = &stack->rec;
1586 stack->context_ptr = &stack->context;
1587 ESP_sig(sigcontext) = (DWORD)stack;
1588 EIP_sig(sigcontext) = (DWORD)pKiUserExceptionDispatcher;
1589 /* clear single-step, direction, and align check flag */
1590 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1591 CS_sig(sigcontext) = get_cs();
1592 DS_sig(sigcontext) = get_ds();
1593 ES_sig(sigcontext) = get_ds();
1594 FS_sig(sigcontext) = get_fs();
1595 GS_sig(sigcontext) = get_gs();
1596 SS_sig(sigcontext) = get_ds();
1597 }
1598
1599
1600 /***********************************************************************
1601 * setup_exception
1602 *
1603 * Do the full setup to raise an exception from an exception record.
1604 */
1605 static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec )
1606 {
1607 struct xcontext xcontext;
1608 void *stack = setup_exception_record( sigcontext, rec, &xcontext );
1609
1610 setup_raise_exception( sigcontext, stack, rec, &xcontext );
1611 }
1612
1613 /* stack layout when calling an user apc function.
1614 * FIXME: match Windows ABI. */
1615 struct apc_stack_layout
1616 {
1617 void *context_ptr;
1618 void *arg1;
1619 void *arg2;
1620 void *arg3;
1621 void *func;
1622 CONTEXT context;
1623 };
1624
1625 struct apc_stack_layout * WINAPI setup_user_apc_dispatcher_stack( CONTEXT *context, struct apc_stack_layout *stack,
1626 void *arg1, void *arg2, void *arg3,
1627 void *func, NTSTATUS status ) DECLSPEC_HIDDEN;
1628 struct apc_stack_layout * WINAPI setup_user_apc_dispatcher_stack( CONTEXT *context, struct apc_stack_layout *stack,
1629 void *arg1, void *arg2, void *arg3,
1630 void *func, NTSTATUS status )
1631 {
1632 CONTEXT c;
1633
1634 if (!context)
1635 {
1636 c.ContextFlags = CONTEXT_FULL;
1637 NtGetContextThread( GetCurrentThread(), &c );
1638 c.Eax = status;
1639 context = &c;
1640 }
1641 memmove( &stack->context, context, sizeof(stack->context) );
1642 stack->context_ptr = &stack->context;
1643 stack->arg1 = arg1;
1644 stack->arg2 = arg2;
1645 stack->arg3 = arg3;
1646 stack->func = func;
1647 return stack;
1648 }
1649
1650 C_ASSERT( sizeof(struct apc_stack_layout) == 0x2e0 );
1651 C_ASSERT( offsetof(struct apc_stack_layout, context) == 20 );
1652
1653 /***********************************************************************
1654 * call_user_apc_dispatcher
1655 */
1656 __ASM_GLOBAL_FUNC( call_user_apc_dispatcher,
1657 "movl 4(%esp),%esi\n\t" /* context_ptr */
1658 "movl 24(%esp),%edi\n\t" /* dispatcher */
1659 "leal 4(%esp),%ebp\n\t"
1660 "test %esi,%esi\n\t"
1661 "jz 1f\n\t"
1662 "movl 0xc4(%esi),%eax\n\t" /* context_ptr->Esp */
1663 "jmp 2f\n\t"
1664 "1:\tmovl %fs:0x1f8,%eax\n\t" /* x86_thread_data()->syscall_frame */
1665 "leal 0x38(%eax),%eax\n\t" /* &x86_thread_data()->syscall_frame->ret_addr */
1666 "2:\tsubl $0x2e0,%eax\n\t" /* sizeof(struct apc_stack_layout) */
1667 "movl %ebp,%esp\n\t" /* pop return address */
1668 "cmpl %esp,%eax\n\t"
1669 "cmovbl %eax,%esp\n\t"
1670 "pushl 24(%ebp)\n\t" /* status */
1671 "pushl 16(%ebp)\n\t" /* func */
1672 "pushl 12(%ebp)\n\t" /* arg3 */
1673 "pushl 8(%ebp)\n\t" /* arg2 */
1674 "pushl 4(%ebp)\n\t" /* arg1 */
1675 "pushl %eax\n\t"
1676 "pushl %esi\n\t"
1677 "call " __ASM_STDCALL("setup_user_apc_dispatcher_stack",24) "\n\t"
1678 "movl $0,%fs:0x1f8\n\t" /* x86_thread_data()->syscall_frame = NULL */
1679 "movl %eax,%esp\n\t"
1680 "leal 20(%eax),%esi\n\t"
1681 "movl 0xb4(%esi),%ebp\n\t" /* context.Ebp */
1682 "pushl 0xb8(%esi)\n\t" /* context.Eip */
1683 "jmp *%edi\n" )
1684
1685
1686 /***********************************************************************
1687 * call_raise_user_exception_dispatcher
1688 */
1689 void WINAPI call_raise_user_exception_dispatcher( NTSTATUS (WINAPI *dispatcher)(void) )
1690 {
1691 x86_thread_data()->syscall_frame->eip = (DWORD)dispatcher;
1692 }
1693
1694
1695 /***********************************************************************
1696 * call_user_exception_dispatcher
1697 */
1698 __ASM_GLOBAL_FUNC( call_user_exception_dispatcher,
1699 "movl 4(%esp),%edx\n\t" /* rec */
1700 "movl 8(%esp),%ecx\n\t" /* context */
1701 "cmpl $0x80000003,(%edx)\n\t" /* rec->ExceptionCode */
1702 "jne 1f\n\t"
1703 "decl 0xb8(%ecx)\n" /* context->Eip */
1704 "1:\tmovl %fs:0x1f8,%eax\n\t" /* x86_thread_data()->syscall_frame */
1705 "movl 0x1c(%eax),%ebx\n\t" /* frame->ebx */
1706 "movl 0x28(%eax),%edi\n\t" /* frame->edi */
1707 "movl 0x2c(%eax),%esi\n\t" /* frame->esi */
1708 "movl 0x30(%eax),%ebp\n\t" /* frame->ebp */
1709 "movl %edx,0x30(%eax)\n\t"
1710 "movl %ecx,0x34(%eax)\n\t"
1711 "movl 12(%esp),%edx\n\t" /* dispatcher */
1712 "movl $0,%fs:0x1f8\n\t"
1713 "leal 0x30(%eax),%esp\n\t"
1714 "jmp *%edx" )
1715
1716 /**********************************************************************
1717 * get_fpu_code
1718 *
1719 * Get the FPU exception code from the FPU status.
1720 */
1721 static inline DWORD get_fpu_code( const CONTEXT *context )
1722 {
1723 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1724
1725 if (status & 0x01) /* IE */
1726 {
1727 if (status & 0x40) /* SF */
1728 return EXCEPTION_FLT_STACK_CHECK;
1729 else
1730 return EXCEPTION_FLT_INVALID_OPERATION;
1731 }
1732 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1733 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1734 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1735 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1736 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1737 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1738 }
1739
1740
1741 /***********************************************************************
1742 * handle_interrupt
1743 *
1744 * Handle an interrupt.
1745 */
1746 static BOOL handle_interrupt( unsigned int interrupt, ucontext_t *sigcontext, void *stack,
1747 EXCEPTION_RECORD *rec, struct xcontext *xcontext )
1748 {
1749 CONTEXT *context = &xcontext->c;
1750
1751 switch(interrupt)
1752 {
1753 case 0x2d:
1754 if (!is_wow64)
1755 {
1756 /* On Wow64, the upper DWORD of Rax contains garbage, and the debug
1757 * service is usually not recognized when called from usermode. */
1758 switch (context->Eax)
1759 {
1760 case 1: /* BREAKPOINT_PRINT */
1761 case 3: /* BREAKPOINT_LOAD_SYMBOLS */
1762 case 4: /* BREAKPOINT_UNLOAD_SYMBOLS */
1763 case 5: /* BREAKPOINT_COMMAND_STRING (>= Win2003) */
1764 EIP_sig(sigcontext) += 3;
1765 return TRUE;
1766 }
1767 }
1768 context->Eip += 3;
1769 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1770 rec->ExceptionAddress = (void *)context->Eip;
1771 rec->NumberParameters = is_wow64 ? 1 : 3;
1772 rec->ExceptionInformation[0] = context->Eax;
1773 rec->ExceptionInformation[1] = context->Ecx;
1774 rec->ExceptionInformation[2] = context->Edx;
1775 setup_raise_exception( sigcontext, stack, rec, xcontext );
1776 return TRUE;
1777 default:
1778 return FALSE;
1779 }
1780 }
1781
1782
1783 /***********************************************************************
1784 * handle_syscall_fault
1785 *
1786 * Handle a page fault happening during a system call.
1787 */
1788 static BOOL handle_syscall_fault( ucontext_t *sigcontext, void *stack_ptr,
1789 EXCEPTION_RECORD *rec, CONTEXT *context )
1790 {
1791 struct syscall_frame *frame = x86_thread_data()->syscall_frame;
1792 __WINE_FRAME *wine_frame = (__WINE_FRAME *)NtCurrentTeb()->Tib.ExceptionList;
1793 DWORD i;
1794
1795 if (!frame) return FALSE;
1796
1797 TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
1798 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
1799 context->Eip, GetCurrentThreadId() );
1800 for (i = 0; i < rec->NumberParameters; i++)
1801 TRACE( " info[%d]=%08lx\n", i, rec->ExceptionInformation[i] );
1802 TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
1803 context->Eax, context->Ebx, context->Ecx,
1804 context->Edx, context->Esi, context->Edi );
1805 TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
1806 context->Ebp, context->Esp, context->SegCs, context->SegDs,
1807 context->SegEs, context->SegFs, context->SegGs, context->EFlags );
1808
1809 if ((char *)wine_frame < (char *)frame)
1810 {
1811 /* stack frame for calling __wine_longjmp */
1812 struct
1813 {
1814 int retval;
1815 __wine_jmp_buf *jmp;
1816 void *retaddr;
1817 } *stack;
1818
1819 TRACE( "returning to handler\n" );
1820 stack = virtual_setup_exception( stack_ptr, sizeof(*stack), rec );
1821 stack->retval = 1;
1822 stack->jmp = &wine_frame->jmp;
1823 stack->retaddr = (void *)0xdeadbabe;
1824 ESP_sig(sigcontext) = (DWORD)stack;
1825 EIP_sig(sigcontext) = (DWORD)__wine_longjmp;
1826 }
1827 else
1828 {
1829 TRACE( "returning to user mode ip=%08x ret=%08x\n", frame->eip, rec->ExceptionCode );
1830 EAX_sig(sigcontext) = rec->ExceptionCode;
1831 EBX_sig(sigcontext) = frame->ebx;
1832 ESI_sig(sigcontext) = frame->esi;
1833 EDI_sig(sigcontext) = frame->edi;
1834 EBP_sig(sigcontext) = frame->ebp;
1835 ESP_sig(sigcontext) = frame->esp;
1836 EIP_sig(sigcontext) = frame->eip;
1837 x86_thread_data()->syscall_frame = NULL;
1838 }
1839 return TRUE;
1840 }
1841
1842
1843 /**********************************************************************
1844 * segv_handler
1845 *
1846 * Handler for SIGSEGV and related errors.
1847 */
1848 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1849 {
1850 EXCEPTION_RECORD rec = { 0 };
1851 struct xcontext xcontext;
1852 ucontext_t *ucontext = sigcontext;
1853 void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
1854
1855 switch (TRAP_sig(ucontext))
1856 {
1857 case TRAP_x86_OFLOW: /* Overflow exception */
1858 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
1859 break;
1860 case TRAP_x86_BOUND: /* Bound range exception */
1861 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1862 break;
1863 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1864 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1865 break;
1866 case TRAP_x86_STKFLT: /* Stack fault */
1867 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1868 break;
1869 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1870 case TRAP_x86_PROTFLT: /* General protection fault */
1871 {
1872 WORD err = ERROR_sig(ucontext);
1873 if (!err && (rec.ExceptionCode = is_privileged_instr( &xcontext.c ))) break;
1874 if ((err & 7) == 2 && handle_interrupt( err >> 3, ucontext, stack, &rec, &xcontext )) return;
1875 rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1876 rec.NumberParameters = 2;
1877 rec.ExceptionInformation[0] = 0;
1878 /* if error contains a LDT selector, use that as fault address */
1879 if ((err & 7) == 4 && !ldt_is_system( err | 7 )) rec.ExceptionInformation[1] = err & ~7;
1880 else
1881 {
1882 rec.ExceptionInformation[1] = 0xffffffff;
1883 if (check_invalid_gs( ucontext, &xcontext.c )) return;
1884 }
1885 }
1886 break;
1887 case TRAP_x86_PAGEFLT: /* Page fault */
1888 rec.NumberParameters = 2;
1889 rec.ExceptionInformation[0] = (ERROR_sig(ucontext) >> 1) & 0x09;
1890 rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1891 rec.ExceptionCode = virtual_handle_fault( siginfo->si_addr, rec.ExceptionInformation[0], stack );
1892 if (!rec.ExceptionCode) return;
1893 if (rec.ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1894 rec.ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
1895 {
1896 ULONG flags;
1897 NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
1898 &flags, sizeof(flags), NULL );
1899 if (!(flags & MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION) &&
1900 check_atl_thunk( ucontext, &rec, &xcontext.c ))
1901 return;
1902
1903 /* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
1904 if (!(flags & MEM_EXECUTE_OPTION_DISABLE)) rec.ExceptionInformation[0] = EXCEPTION_READ_FAULT;
1905 }
1906 break;
1907 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1908 /* FIXME: pass through exception handler first? */
1909 if (xcontext.c.EFlags & 0x00040000)
1910 {
1911 EFL_sig(ucontext) &= ~0x00040000; /* disable AC flag */
1912 return;
1913 }
1914 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1915 break;
1916 default:
1917 WINE_ERR( "Got unexpected trap %d\n", TRAP_sig(ucontext) );
1918 /* fall through */
1919 case TRAP_x86_NMI: /* NMI interrupt */
1920 case TRAP_x86_DNA: /* Device not available exception */
1921 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1922 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1923 case TRAP_x86_MCHK: /* Machine check exception */
1924 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1925 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1926 break;
1927 }
1928 if (handle_syscall_fault( ucontext, stack, &rec, &xcontext.c )) return;
1929 setup_raise_exception( ucontext, stack, &rec, &xcontext );
1930 }
1931
1932
1933 /**********************************************************************
1934 * trap_handler
1935 *
1936 * Handler for SIGTRAP.
1937 */
1938 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1939 {
1940 EXCEPTION_RECORD rec = { 0 };
1941 struct xcontext xcontext;
1942 ucontext_t *ucontext = sigcontext;
1943 void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
1944
1945 switch (TRAP_sig(ucontext))
1946 {
1947 case TRAP_x86_TRCTRAP: /* Single-step exception */
1948 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1949 /* when single stepping can't tell whether this is a hw bp or a
1950 * single step interrupt. try to avoid as much overhead as possible
1951 * and only do a server call if there is any hw bp enabled. */
1952 if (!(xcontext.c.EFlags & 0x100) || (xcontext.c.Dr7 & 0xff))
1953 {
1954 /* (possible) hardware breakpoint, fetch the debug registers */
1955 DWORD saved_flags = xcontext.c.ContextFlags;
1956 xcontext.c.ContextFlags = CONTEXT_DEBUG_REGISTERS;
1957 NtGetContextThread( GetCurrentThread(), &xcontext.c );
1958 xcontext.c.ContextFlags |= saved_flags; /* restore flags */
1959 }
1960 xcontext.c.EFlags &= ~0x100; /* clear single-step flag */
1961 break;
1962 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1963 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1964 /* fall through */
1965 default:
1966 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1967 rec.NumberParameters = is_wow64 ? 1 : 3;
1968 rec.ExceptionInformation[0] = 0;
1969 rec.ExceptionInformation[1] = 0; /* FIXME */
1970 rec.ExceptionInformation[2] = 0; /* FIXME */
1971 break;
1972 }
1973 setup_raise_exception( sigcontext, stack, &rec, &xcontext );
1974 }
1975
1976
1977 /**********************************************************************
1978 * fpe_handler
1979 *
1980 * Handler for SIGFPE.
1981 */
1982 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1983 {
1984 EXCEPTION_RECORD rec = { 0 };
1985 struct xcontext xcontext;
1986 ucontext_t *ucontext = sigcontext;
1987 void *stack = setup_exception_record( sigcontext, &rec, &xcontext );
1988
1989 switch (TRAP_sig(ucontext))
1990 {
1991 case TRAP_x86_DIVIDE: /* Division by zero exception */
1992 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1993 break;
1994 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1995 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1996 break;
1997 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1998 rec.ExceptionCode = get_fpu_code( &xcontext.c );
1999 rec.ExceptionAddress = (void *)xcontext.c.FloatSave.ErrorOffset;
2000 break;
2001 case TRAP_x86_CACHEFLT: /* SIMD exception */
2002 /* TODO:
2003 * Behaviour only tested for divide-by-zero exceptions
2004 * Check for other SIMD exceptions as well */
2005 if(siginfo->si_code != FPE_FLTDIV && siginfo->si_code != FPE_FLTINV)
2006 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
2007 siginfo->si_code);
2008
2009 rec.ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
2010 rec.NumberParameters = 1;
2011 /* no idea what meaning is actually behind this but that's what native does */
2012 rec.ExceptionInformation[0] = 0;
2013 break;
2014 default:
2015 WINE_ERR( "Got unexpected trap %d\n", TRAP_sig(ucontext) );
2016 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
2017 break;
2018 }
2019 setup_raise_exception( sigcontext, stack, &rec, &xcontext );
2020 }
2021
2022
2023 /**********************************************************************
2024 * int_handler
2025 *
2026 * Handler for SIGINT.
2027 */
2028 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2029 {
2030 EXCEPTION_RECORD rec = { CONTROL_C_EXIT };
2031
2032 setup_exception( sigcontext, &rec );
2033 }
2034
2035 /**********************************************************************
2036 * abrt_handler
2037 *
2038 * Handler for SIGABRT.
2039 */
2040 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2041 {
2042 EXCEPTION_RECORD rec = { EXCEPTION_WINE_ASSERTION, EH_NONCONTINUABLE };
2043
2044 setup_exception( sigcontext, &rec );
2045 }
2046
2047
2048 /**********************************************************************
2049 * quit_handler
2050 *
2051 * Handler for SIGQUIT.
2052 */
2053 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2054 {
2055 init_handler( sigcontext );
2056 abort_thread(0);
2057 }
2058
2059
2060 /**********************************************************************
2061 * usr1_handler
2062 *
2063 * Handler for SIGUSR1, used to signal a thread that it got suspended.
2064 */
2065 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2066 {
2067 struct xcontext xcontext;
2068
2069 init_handler( sigcontext );
2070 if (x86_thread_data()->syscall_frame)
2071 {
2072 DECLSPEC_ALIGN(64) XSTATE xs;
2073 xcontext.c.ContextFlags = CONTEXT_FULL;
2074 context_init_xstate( &xcontext.c, &xs );
2075
2076 NtGetContextThread( GetCurrentThread(), &xcontext.c );
2077 wait_suspend( &xcontext.c );
2078 NtSetContextThread( GetCurrentThread(), &xcontext.c );
2079 }
2080 else
2081 {
2082 save_context( &xcontext, sigcontext );
2083 wait_suspend( &xcontext.c );
2084 restore_context( &xcontext, sigcontext );
2085 }
2086 }
2087
2088
2089 /***********************************************************************
2090 * LDT support
2091 */
2092
2093 #define LDT_SIZE 8192
2094
2095 #define LDT_FLAGS_DATA 0x13 /* Data segment */
2096 #define LDT_FLAGS_CODE 0x1b /* Code segment */
2097 #define LDT_FLAGS_32BIT 0x40 /* Segment is 32-bit (code or stack) */
2098 #define LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated */
2099
2100 struct ldt_copy
2101 {
2102 void *base[LDT_SIZE];
2103 unsigned int limit[LDT_SIZE];
2104 unsigned char flags[LDT_SIZE];
2105 } __wine_ldt_copy;
2106
2107 static WORD gdt_fs_sel;
2108 static pthread_mutex_t ldt_mutex = PTHREAD_MUTEX_INITIALIZER;
2109 static const LDT_ENTRY null_entry;
2110
2111 static inline void *ldt_get_base( LDT_ENTRY ent )
2112 {
2113 return (void *)(ent.BaseLow |
2114 (ULONG_PTR)ent.HighWord.Bits.BaseMid << 16 |
2115 (ULONG_PTR)ent.HighWord.Bits.BaseHi << 24);
2116 }
2117
2118 static inline unsigned int ldt_get_limit( LDT_ENTRY ent )
2119 {
2120 unsigned int limit = ent.LimitLow | (ent.HighWord.Bits.LimitHi << 16);
2121 if (ent.HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff;
2122 return limit;
2123 }
2124
2125 static LDT_ENTRY ldt_make_entry( void *base, unsigned int limit, unsigned char flags )
2126 {
2127 LDT_ENTRY entry;
2128
2129 entry.BaseLow = (WORD)(ULONG_PTR)base;
2130 entry.HighWord.Bits.BaseMid = (BYTE)((ULONG_PTR)base >> 16);
2131 entry.HighWord.Bits.BaseHi = (BYTE)((ULONG_PTR)base >> 24);
2132 if ((entry.HighWord.Bits.Granularity = (limit >= 0x100000))) limit >>= 12;
2133 entry.LimitLow = (WORD)limit;
2134 entry.HighWord.Bits.LimitHi = limit >> 16;
2135 entry.HighWord.Bits.Dpl = 3;
2136 entry.HighWord.Bits.Pres = 1;
2137 entry.HighWord.Bits.Type = flags;
2138 entry.HighWord.Bits.Sys = 0;
2139 entry.HighWord.Bits.Reserved_0 = 0;
2140 entry.HighWord.Bits.Default_Big = (flags & LDT_FLAGS_32BIT) != 0;
2141 return entry;
2142 }
2143
2144 static void ldt_set_entry( WORD sel, LDT_ENTRY entry )
2145 {
2146 int index = sel >> 3;
2147
2148 #ifdef linux
2149 struct modify_ldt_s ldt_info = { index };
2150
2151 ldt_info.base_addr = ldt_get_base( entry );
2152 ldt_info.limit = entry.LimitLow | (entry.HighWord.Bits.LimitHi << 16);
2153 ldt_info.seg_32bit = entry.HighWord.Bits.Default_Big;
2154 ldt_info.contents = (entry.HighWord.Bits.Type >> 2) & 3;
2155 ldt_info.read_exec_only = !(entry.HighWord.Bits.Type & 2);
2156 ldt_info.limit_in_pages = entry.HighWord.Bits.Granularity;
2157 ldt_info.seg_not_present = !entry.HighWord.Bits.Pres;
2158 ldt_info.usable = entry.HighWord.Bits.Sys;
2159 if (modify_ldt( 0x11, &ldt_info, sizeof(ldt_info) ) < 0) perror( "modify_ldt" );
2160 #elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
2161 /* The kernel will only let us set LDTs with user priority level */
2162 if (entry.HighWord.Bits.Pres && entry.HighWord.Bits.Dpl != 3) entry.HighWord.Bits.Dpl = 3;
2163 if (i386_set_ldt(index, (union descriptor *)&entry, 1) < 0)
2164 {
2165 perror("i386_set_ldt");
2166 fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
2167 exit(1);
2168 }
2169 #elif defined(__svr4__) || defined(_SCO_DS)
2170 struct ssd ldt_mod;
2171
2172 ldt_mod.sel = sel;
2173 ldt_mod.bo = (unsigned long)ldt_get_base( entry );
2174 ldt_mod.ls = entry.LimitLow | (entry.HighWord.Bits.LimitHi << 16);
2175 ldt_mod.acc1 = entry.HighWord.Bytes.Flags1;
2176 ldt_mod.acc2 = entry.HighWord.Bytes.Flags2 >> 4;
2177 if (sysi86(SI86DSCR, &ldt_mod) == -1) perror("sysi86");
2178 #elif defined(__APPLE__)
2179 if (i386_set_ldt(index, (union ldt_entry *)&entry, 1) < 0) perror("i386_set_ldt");
2180 #elif defined(__GNU__)
2181 if (i386_set_ldt(mach_thread_self(), sel, (descriptor_list_t)&entry, 1) != KERN_SUCCESS)
2182 perror("i386_set_ldt");
2183 #else
2184 fprintf( stderr, "No LDT support on this platform\n" );
2185 exit(1);
2186 #endif
2187
2188 __wine_ldt_copy.base[index] = ldt_get_base( entry );
2189 __wine_ldt_copy.limit[index] = ldt_get_limit( entry );
2190 __wine_ldt_copy.flags[index] = (entry.HighWord.Bits.Type |
2191 (entry.HighWord.Bits.Default_Big ? LDT_FLAGS_32BIT : 0) |
2192 LDT_FLAGS_ALLOCATED);
2193 }
2194
2195 static void ldt_set_fs( WORD sel, TEB *teb )
2196 {
2197 if (sel == gdt_fs_sel)
2198 {
2199 #ifdef __linux__
2200 struct modify_ldt_s ldt_info = { sel >> 3 };
2201
2202 ldt_info.base_addr = teb;
2203 ldt_info.limit = page_size - 1;
2204 ldt_info.seg_32bit = 1;
2205 if (set_thread_area( &ldt_info ) < 0) perror( "set_thread_area" );
2206 #elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__)
2207 i386_set_fsbase( teb );
2208 #endif
2209 }
2210 set_fs( sel );
2211 }
2212
2213
2214 /**********************************************************************
2215 * get_thread_ldt_entry
2216 */
2217 NTSTATUS get_thread_ldt_entry( HANDLE handle, void *data, ULONG len, ULONG *ret_len )
2218 {
2219 THREAD_DESCRIPTOR_INFORMATION *info = data;
2220 NTSTATUS status = STATUS_SUCCESS;
2221
2222 if (len < sizeof(*info)) return STATUS_INFO_LENGTH_MISMATCH;
2223 if (info->Selector >> 16) return STATUS_UNSUCCESSFUL;
2224
2225 if (is_gdt_sel( info->Selector ))
2226 {
2227 if (!(info->Selector & ~3))
2228 info->Entry = null_entry;
2229 else if ((info->Selector | 3) == get_cs())
2230 info->Entry = ldt_make_entry( 0, ~0u, LDT_FLAGS_CODE | LDT_FLAGS_32BIT );
2231 else if ((info->Selector | 3) == get_ds())
2232 info->Entry = ldt_make_entry( 0, ~0u, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
2233 else if ((info->Selector | 3) == get_fs())
2234 info->Entry = ldt_make_entry( NtCurrentTeb(), 0xfff, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
2235 else
2236 return STATUS_UNSUCCESSFUL;
2237 }
2238 else
2239 {
2240 SERVER_START_REQ( get_selector_entry )
2241 {
2242 req->handle = wine_server_obj_handle( handle );
2243 req->entry = info->Selector >> 3;
2244 status = wine_server_call( req );
2245 if (!status)
2246 {
2247 if (reply->flags)
2248 info->Entry = ldt_make_entry( (void *)reply->base, reply->limit, reply->flags );
2249 else
2250 status = STATUS_UNSUCCESSFUL;
2251 }
2252 }
2253 SERVER_END_REQ;
2254 }
2255 if (status == STATUS_SUCCESS && ret_len)
2256 /* yes, that's a bit strange, but it's the way it is */
2257 *ret_len = sizeof(info->Entry);
2258
2259 return status;
2260 }
2261
2262
2263 /******************************************************************************
2264 * NtSetLdtEntries (NTDLL.@)
2265 * ZwSetLdtEntries (NTDLL.@)
2266 */
2267 NTSTATUS WINAPI NtSetLdtEntries( ULONG sel1, LDT_ENTRY entry1, ULONG sel2, LDT_ENTRY entry2 )
2268 {
2269 sigset_t sigset;
2270
2271 if (sel1 >> 16 || sel2 >> 16) return STATUS_INVALID_LDT_DESCRIPTOR;
2272 if (sel1 && (sel1 >> 3) < first_ldt_entry) return STATUS_INVALID_LDT_DESCRIPTOR;
2273 if (sel2 && (sel2 >> 3) < first_ldt_entry) return STATUS_INVALID_LDT_DESCRIPTOR;
2274
2275 server_enter_uninterrupted_section( &ldt_mutex, &sigset );
2276 if (sel1) ldt_set_entry( sel1, entry1 );
2277 if (sel2) ldt_set_entry( sel2, entry2 );
2278 server_leave_uninterrupted_section( &ldt_mutex, &sigset );
2279 return STATUS_SUCCESS;
2280 }
2281
2282
2283 /**********************************************************************
2284 * signal_init_threading
2285 */
2286 void signal_init_threading(void)
2287 {
2288 #ifdef __linux__
2289 /* the preloader may have allocated it already */
2290 gdt_fs_sel = get_fs();
2291 if (!gdt_fs_sel || !is_gdt_sel( gdt_fs_sel ))
2292 {
2293 struct modify_ldt_s ldt_info = { -1 };
2294
2295 ldt_info.seg_32bit = 1;
2296 ldt_info.usable = 1;
2297 if (set_thread_area( &ldt_info ) >= 0) gdt_fs_sel = (ldt_info.entry_number << 3) | 3;
2298 else gdt_fs_sel = 0;
2299 }
2300 #elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__)
2301 gdt_fs_sel = GSEL( GUFS_SEL, SEL_UPL );
2302 #endif
2303 }
2304
2305
2306 /**********************************************************************
2307 * signal_alloc_thread
2308 */
2309 NTSTATUS signal_alloc_thread( TEB *teb )
2310 {
2311 struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
2312
2313 if (!gdt_fs_sel)
2314 {
2315 static int first_thread = 1;
2316 sigset_t sigset;
2317 int idx;
2318 LDT_ENTRY entry = ldt_make_entry( teb, page_size - 1, LDT_FLAGS_DATA | LDT_FLAGS_32BIT );
2319
2320 if (first_thread) /* no locking for first thread */
2321 {
2322 /* leave some space if libc is using the LDT for %gs */
2323 if (!is_gdt_sel( get_gs() )) first_ldt_entry = 512;
2324 idx = first_ldt_entry;
2325 ldt_set_entry( (idx << 3) | 7, entry );
2326 first_thread = 0;
2327 }
2328 else
2329 {
2330 server_enter_uninterrupted_section( &ldt_mutex, &sigset );
2331 for (idx = first_ldt_entry; idx < LDT_SIZE; idx++)
2332 {
2333 if (__wine_ldt_copy.flags[idx]) continue;
2334 ldt_set_entry( (idx << 3) | 7, entry );
2335 break;
2336 }
2337 server_leave_uninterrupted_section( &ldt_mutex, &sigset );
2338 if (idx == LDT_SIZE) return STATUS_TOO_MANY_THREADS;
2339 }
2340 thread_data->fs = (idx << 3) | 7;
2341 }
2342 else thread_data->fs = gdt_fs_sel;
2343
2344 teb->WOW32Reserved = syscall_dispatcher;
2345 return STATUS_SUCCESS;
2346 }
2347
2348
2349 /**********************************************************************
2350 * signal_free_thread
2351 */
2352 void signal_free_thread( TEB *teb )
2353 {
2354 struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
2355 sigset_t sigset;
2356
2357 if (gdt_fs_sel) return;
2358
2359 server_enter_uninterrupted_section( &ldt_mutex, &sigset );
2360 __wine_ldt_copy.flags[thread_data->fs >> 3] = 0;
2361 server_leave_uninterrupted_section( &ldt_mutex, &sigset );
2362 }
2363
2364
2365 /**********************************************************************
2366 * signal_init_thread
2367 */
2368 void signal_init_thread( TEB *teb )
2369 {
2370 const WORD fpu_cw = 0x27f;
2371 struct x86_thread_data *thread_data = (struct x86_thread_data *)&teb->GdiTebBatch;
2372
2373 ldt_set_fs( thread_data->fs, teb );
2374 thread_data->gs = get_gs();
2375
2376 __asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
2377 }
2378
2379
2380 /**********************************************************************
2381 * signal_init_process
2382 */
2383 void signal_init_process(void)
2384 {
2385 struct sigaction sig_act;
2386
2387 sig_act.sa_mask = server_block_set;
2388 sig_act.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
2389 #ifdef __ANDROID__
2390 sig_act.sa_flags |= SA_RESTORER;
2391 sig_act.sa_restorer = rt_sigreturn;
2392 #endif
2393 sig_act.sa_sigaction = int_handler;
2394 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
2395 sig_act.sa_sigaction = fpe_handler;
2396 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
2397 sig_act.sa_sigaction = abrt_handler;
2398 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
2399 sig_act.sa_sigaction = quit_handler;
2400 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
2401 sig_act.sa_sigaction = usr1_handler;
2402 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
2403 sig_act.sa_sigaction = trap_handler;
2404 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
2405 sig_act.sa_sigaction = segv_handler;
2406 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
2407 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
2408 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
2409 return;
2410
2411 error:
2412 perror("sigaction");
2413 exit(1);
2414 }
2415
2416
2417 /**********************************************************************
2418 * signal_init_syscalls
2419 */
2420 void *signal_init_syscalls(void)
2421 {
2422 extern void __wine_syscall_dispatcher_fxsave(void) DECLSPEC_HIDDEN;
2423 extern void __wine_syscall_dispatcher_xsave(void) DECLSPEC_HIDDEN;
2424 extern void __wine_syscall_dispatcher_xsavec(void) DECLSPEC_HIDDEN;
2425
2426 if (xstate_compaction_enabled)
2427 syscall_dispatcher = __wine_syscall_dispatcher_xsavec;
2428 else if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_XSAVE)
2429 syscall_dispatcher = __wine_syscall_dispatcher_xsave;
2430 else if (cpu_info.ProcessorFeatureBits & CPU_FEATURE_FXSR)
2431 syscall_dispatcher = __wine_syscall_dispatcher_fxsave;
2432 else
2433 syscall_dispatcher = __wine_syscall_dispatcher;
2434
2435 return NtCurrentTeb()->WOW32Reserved = syscall_dispatcher;
2436 }
2437
2438
2439 /***********************************************************************
2440 * init_thread_context
2441 */
2442 static void init_thread_context( CONTEXT *context, LPTHREAD_START_ROUTINE entry, void *arg )
2443 {
2444 context->SegCs = get_cs();
2445 context->SegDs = get_ds();
2446 context->SegEs = get_ds();
2447 context->SegFs = get_fs();
2448 context->SegGs = get_gs();
2449 context->SegSs = get_ds();
2450 context->EFlags = 0x202;
2451 context->Eax = (DWORD)entry;
2452 context->Ebx = (DWORD)arg;
2453 context->Esp = (DWORD)NtCurrentTeb()->Tib.StackBase - 16;
2454 context->Eip = (DWORD)pRtlUserThreadStart;
2455 context->FloatSave.ControlWord = 0x27f;
2456 ((XSAVE_FORMAT *)context->ExtendedRegisters)->ControlWord = 0x27f;
2457 ((XSAVE_FORMAT *)context->ExtendedRegisters)->MxCsr = 0x1f80;
2458 if (NtCurrentTeb64())
2459 {
2460 WOW64_CPURESERVED *cpu = ULongToPtr( NtCurrentTeb64()->TlsSlots[WOW64_TLS_CPURESERVED] );
2461 memcpy( cpu + 1, context, sizeof(*context) );
2462 }
2463 }
2464
2465
2466 /***********************************************************************
2467 * get_initial_context
2468 */
2469 PCONTEXT DECLSPEC_HIDDEN get_initial_context( LPTHREAD_START_ROUTINE entry, void *arg, BOOL suspend )
2470 {
2471 CONTEXT *ctx;
2472
2473 if (suspend)
2474 {
2475 CONTEXT context = { CONTEXT_ALL };
2476
2477 init_thread_context( &context, entry, arg );
2478 wait_suspend( &context );
2479 ctx = (CONTEXT *)((ULONG_PTR)context.Esp & ~15) - 1;
2480 *ctx = context;
2481 }
2482 else
2483 {
2484 ctx = (CONTEXT *)((char *)NtCurrentTeb()->Tib.StackBase - 16) - 1;
2485 init_thread_context( ctx, entry, arg );
2486 }
2487 pthread_sigmask( SIG_UNBLOCK, &server_block_set, NULL );
2488 ctx->ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
2489 return ctx;
2490 }
2491
2492
2493 /***********************************************************************
2494 * signal_start_thread
2495 */
2496 __ASM_GLOBAL_FUNC( signal_start_thread,
2497 "pushl %ebp\n\t"
2498 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2499 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2500 "movl %esp,%ebp\n\t"
2501 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2502 "pushl %ebx\n\t"
2503 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2504 "pushl %esi\n\t"
2505 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2506 "pushl %edi\n\t"
2507 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2508 /* store exit frame */
2509 "movl %ebp,%fs:0x1f4\n\t" /* x86_thread_data()->exit_frame */
2510 /* switch to thread stack */
2511 "movl %fs:4,%eax\n\t" /* NtCurrentTeb()->StackBase */
2512 "leal -0x1004(%eax),%esp\n\t"
2513 /* attach dlls */
2514 "pushl 16(%ebp)\n\t" /* suspend */
2515 "pushl 12(%ebp)\n\t" /* arg */
2516 "pushl 8(%ebp)\n\t" /* entry */
2517 "call " __ASM_NAME("get_initial_context") "\n\t"
2518 "movl %eax,(%esp)\n\t" /* context */
2519 "movl 20(%ebp),%edx\n\t" /* thunk */
2520 "xorl %ebp,%ebp\n\t"
2521 "pushl $0\n\t"
2522 "jmp *%edx" )
2523
2524
2525 /***********************************************************************
2526 * signal_exit_thread
2527 */
2528 __ASM_GLOBAL_FUNC( signal_exit_thread,
2529 "movl 8(%esp),%ecx\n\t"
2530 /* fetch exit frame */
2531 "movl %fs:0x1f4,%edx\n\t" /* x86_thread_data()->exit_frame */
2532 "testl %edx,%edx\n\t"
2533 "jnz 1f\n\t"
2534 "jmp *%ecx\n\t"
2535 /* switch to exit frame stack */
2536 "1:\tmovl 4(%esp),%eax\n\t"
2537 "movl $0,%fs:0x1f4\n\t"
2538 "movl %edx,%ebp\n\t"
2539 __ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
2540 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2541 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2542 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2543 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2544 "leal -20(%ebp),%esp\n\t"
2545 "pushl %eax\n\t"
2546 "call *%ecx" )
2547
2548 /**********************************************************************
2549 * NtCurrentTeb (NTDLL.@)
2550 */
2551 __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
2552
2553 #endif /* __i386__ */
Windows API implementation