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ntdll: Enhance FreeBSD checks to also check for DragonFly BSD when appropriate.
[wine/multimedia.git] / dlls / ntdll / signal_i386.c
blob4a83a70e9ce6f14bfb073e3f9bdd0bab8fd024dc
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 #ifdef __i386__
22
23 #include "config.h"
24 #include "wine/port.h"
25
26 #include <errno.h>
27 #include <signal.h>
28 #include <stdlib.h>
29 #include <stdarg.h>
30 #include <stdio.h>
31 #include <sys/types.h>
32 #ifdef HAVE_UNISTD_H
33 # include <unistd.h>
34 #endif
35
36 #ifdef HAVE_SYS_PARAM_H
37 # include <sys/param.h>
38 #endif
39 #ifdef HAVE_SYSCALL_H
40 # include <syscall.h>
41 #else
42 # ifdef HAVE_SYS_SYSCALL_H
43 # include <sys/syscall.h>
44 # endif
45 #endif
46
47 #ifdef HAVE_SYS_VM86_H
48 # include <sys/vm86.h>
49 #endif
50
51 #ifdef HAVE_SYS_SIGNAL_H
52 # include <sys/signal.h>
53 #endif
54 #ifdef HAVE_SYS_SYSCTL_H
55 # include <sys/sysctl.h>
56 #endif
57
58 #include "ntstatus.h"
59 #define WIN32_NO_STATUS
60 #include "windef.h"
61 #include "wine/library.h"
62 #include "ntdll_misc.h"
63 #include "wine/exception.h"
64 #include "wine/debug.h"
65
66 #ifdef HAVE_VALGRIND_MEMCHECK_H
67 #include <valgrind/memcheck.h>
68 #endif
69
70 #undef ERR /* Solaris needs to define this */
71
72 /* not defined for x86, so copy the x86_64 definition */
73 typedef struct DECLSPEC_ALIGN(16) _M128A
74 {
75 ULONGLONG Low;
76 LONGLONG High;
77 } M128A;
78
79 typedef struct
80 {
81 WORD ControlWord;
82 WORD StatusWord;
83 BYTE TagWord;
84 BYTE Reserved1;
85 WORD ErrorOpcode;
86 DWORD ErrorOffset;
87 WORD ErrorSelector;
88 WORD Reserved2;
89 DWORD DataOffset;
90 WORD DataSelector;
91 WORD Reserved3;
92 DWORD MxCsr;
93 DWORD MxCsr_Mask;
94 M128A FloatRegisters[8];
95 M128A XmmRegisters[16];
96 BYTE Reserved4[96];
97 } XMM_SAVE_AREA32;
98
99 /***********************************************************************
100 * signal context platform-specific definitions
101 */
102
103 #if defined (__linux__)
104
105 typedef ucontext_t SIGCONTEXT;
106
107 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
108 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
109 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
110 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
111 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
112 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
113 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
114 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
115
116 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
117 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
118 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
119 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
120 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
121 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
122
123 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
124 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
125 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
126 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
127
128 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
129 #define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
130
131 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
132 #define VIF_FLAG 0x00080000
133 #define VIP_FLAG 0x00100000
134
135 int vm86_enter( void **vm86_ptr );
136 void vm86_return(void);
137 void vm86_return_end(void);
138 __ASM_GLOBAL_FUNC(vm86_enter,
139 "pushl %ebp\n\t"
140 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
141 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
142 "movl %esp,%ebp\n\t"
143 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
144 "pushl %ebx\n\t"
145 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
146 "movl $166,%eax\n\t" /*SYS_vm86*/
147 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
148 "movl (%ecx),%ecx\n\t"
149 "movl $1,%ebx\n\t" /*VM86_ENTER*/
150 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
151 "pushl %fs\n\t"
152 "pushl %gs\n\t"
153 "int $0x80\n"
154 ".globl " __ASM_NAME("vm86_return") "\n\t"
155 __ASM_FUNC("vm86_return") "\n"
156 __ASM_NAME("vm86_return") ":\n\t"
157 "popl %gs\n\t"
158 "popl %fs\n\t"
159 "popl %ecx\n\t"
160 "popl %ebx\n\t"
161 __ASM_CFI(".cfi_same_value %ebx\n\t")
162 "popl %ebp\n\t"
163 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
164 __ASM_CFI(".cfi_same_value %ebp\n\t")
165 "testl %eax,%eax\n\t"
166 "jl 0f\n\t"
167 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
168 "je " __ASM_NAME("vm86_enter") "\n\t"
169 "0:\n\t"
170 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
171 "movl $0,(%ecx)\n\t"
172 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
173 __ASM_FUNC("vm86_return_end") "\n"
174 __ASM_NAME("vm86_return_end") ":\n\t"
175 "ret" )
176
177 #ifdef HAVE_SYS_VM86_H
178 # define __HAVE_VM86
179 #endif
180
181 #elif defined (__BSDI__)
182
183 #include <machine/frame.h>
184 typedef struct trapframe SIGCONTEXT;
185
186 #define EAX_sig(context) ((context)->tf_eax)
187 #define EBX_sig(context) ((context)->tf_ebx)
188 #define ECX_sig(context) ((context)->tf_ecx)
189 #define EDX_sig(context) ((context)->tf_edx)
190 #define ESI_sig(context) ((context)->tf_esi)
191 #define EDI_sig(context) ((context)->tf_edi)
192 #define EBP_sig(context) ((context)->tf_ebp)
193
194 #define CS_sig(context) ((context)->tf_cs)
195 #define DS_sig(context) ((context)->tf_ds)
196 #define ES_sig(context) ((context)->tf_es)
197 #define SS_sig(context) ((context)->tf_ss)
198
199 #define EFL_sig(context) ((context)->tf_eflags)
200
201 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
202 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
203
204 #define FPU_sig(context) NULL /* FIXME */
205 #define FPUX_sig(context) NULL /* FIXME */
206
207 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
208
209 #include <machine/trap.h>
210
211 typedef struct sigcontext SIGCONTEXT;
212
213 #define EAX_sig(context) ((context)->sc_eax)
214 #define EBX_sig(context) ((context)->sc_ebx)
215 #define ECX_sig(context) ((context)->sc_ecx)
216 #define EDX_sig(context) ((context)->sc_edx)
217 #define ESI_sig(context) ((context)->sc_esi)
218 #define EDI_sig(context) ((context)->sc_edi)
219 #define EBP_sig(context) ((context)->sc_ebp)
220
221 #define CS_sig(context) ((context)->sc_cs)
222 #define DS_sig(context) ((context)->sc_ds)
223 #define ES_sig(context) ((context)->sc_es)
224 #define FS_sig(context) ((context)->sc_fs)
225 #define GS_sig(context) ((context)->sc_gs)
226 #define SS_sig(context) ((context)->sc_ss)
227
228 #define TRAP_sig(context) ((context)->sc_trapno)
229 #define ERROR_sig(context) ((context)->sc_err)
230 #define EFL_sig(context) ((context)->sc_eflags)
231
232 #define EIP_sig(context) ((context)->sc_eip)
233 #define ESP_sig(context) ((context)->sc_esp)
234
235 #define FPU_sig(context) NULL /* FIXME */
236 #define FPUX_sig(context) NULL /* FIXME */
237
238 #elif defined (__OpenBSD__)
239
240 typedef struct sigcontext SIGCONTEXT;
241
242 #define EAX_sig(context) ((context)->sc_eax)
243 #define EBX_sig(context) ((context)->sc_ebx)
244 #define ECX_sig(context) ((context)->sc_ecx)
245 #define EDX_sig(context) ((context)->sc_edx)
246 #define ESI_sig(context) ((context)->sc_esi)
247 #define EDI_sig(context) ((context)->sc_edi)
248 #define EBP_sig(context) ((context)->sc_ebp)
249
250 #define CS_sig(context) ((context)->sc_cs)
251 #define DS_sig(context) ((context)->sc_ds)
252 #define ES_sig(context) ((context)->sc_es)
253 #define FS_sig(context) ((context)->sc_fs)
254 #define GS_sig(context) ((context)->sc_gs)
255 #define SS_sig(context) ((context)->sc_ss)
256
257 #define TRAP_sig(context) ((context)->sc_trapno)
258 #define ERROR_sig(context) ((context)->sc_err)
259 #define EFL_sig(context) ((context)->sc_eflags)
260
261 #define EIP_sig(context) ((context)->sc_eip)
262 #define ESP_sig(context) ((context)->sc_esp)
263
264 #define FPU_sig(context) NULL /* FIXME */
265 #define FPUX_sig(context) NULL /* FIXME */
266
267 #define T_MCHK T_MACHK
268 #define T_XMMFLT T_XFTRAP
269
270 #elif defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
271
272 #ifdef _SCO_DS
273 #include <sys/regset.h>
274 #endif
275 #include <sys/ucontext.h>
276 typedef struct ucontext SIGCONTEXT;
277
278 #ifdef _SCO_DS
279 #define gregs regs
280 #endif
281
282 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
283 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
284 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
285 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
286 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
287 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
288 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
289
290 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
291 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
292 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
293 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
294
295 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
296 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
297
298 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
299
300 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
301 #ifdef UESP
302 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
303 #elif defined(R_ESP)
304 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
305 #else
306 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
307 #endif
308 #ifdef ERR
309 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
310 #endif
311 #ifdef TRAPNO
312 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
313 #endif
314
315 #define FPU_sig(context) NULL /* FIXME */
316 #define FPUX_sig(context) NULL /* FIXME */
317
318 #elif defined (__APPLE__)
319 # include <sys/ucontext.h>
320
321 typedef ucontext_t SIGCONTEXT;
322
323 /* work around silly renaming of struct members in OS X 10.5 */
324 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
325 #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
326 #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
327 #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
328 #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
329 #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
330 #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
331 #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
332 #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
333 #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
334 #define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
335 #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
336 #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
337 #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
338 #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
339 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
340 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
341 #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
342 #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
343 #define FPU_sig(context) NULL
344 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
345 #else
346 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
347 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
348 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
349 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
350 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
351 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
352 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
353 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
354 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
355 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
356 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
357 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
358 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
359 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
360 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
361 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
362 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
363 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
364 #define FPU_sig(context) NULL
365 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
366 #endif
367
368 #elif defined(__NetBSD__)
369 # include <sys/ucontext.h>
370 # include <sys/types.h>
371 # include <signal.h>
372
373 typedef ucontext_t SIGCONTEXT;
374
375 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
376 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
377 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
378 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
379 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
380 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
381 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
382 #define ESP_sig(context) _UC_MACHINE_SP(context)
383
384 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
385 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
386 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
387 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
388 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
389 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
390
391 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
392 #define EIP_sig(context) _UC_MACHINE_PC(context)
393 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
394 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
395
396 #define FPU_sig(context) NULL
397 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
398
399 #define T_MCHK T_MCA
400 #define T_XMMFLT T_XMM
401
402 #else
403 #error You must define the signal context functions for your platform
404 #endif /* linux */
405
406 WINE_DEFAULT_DEBUG_CHANNEL(seh);
407
408 typedef int (*wine_signal_handler)(unsigned int sig);
409
410 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
411 static size_t signal_stack_mask;
412 static size_t signal_stack_size;
413
414 static wine_signal_handler handlers[256];
415
416 static int fpux_support; /* whether the CPU support extended fpu context */
417
418 extern void DECLSPEC_NORETURN __wine_restore_regs( const CONTEXT *context );
419
420 enum i386_trap_code
421 {
422 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
423 #if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
424 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
425 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
426 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
427 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
428 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
429 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
430 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
431 TRAP_x86_DNA = T_DNA, /* Device not available exception */
432 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
433 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
434 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
435 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
436 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
437 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
438 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
439 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
440 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
441 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
442 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
443 #else
444 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
445 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
446 TRAP_x86_NMI = 2, /* NMI interrupt */
447 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
448 TRAP_x86_OFLOW = 4, /* Overflow exception */
449 TRAP_x86_BOUND = 5, /* Bound range exception */
450 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
451 TRAP_x86_DNA = 7, /* Device not available exception */
452 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
453 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
454 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
455 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
456 TRAP_x86_STKFLT = 12, /* Stack fault */
457 TRAP_x86_PROTFLT = 13, /* General protection fault */
458 TRAP_x86_PAGEFLT = 14, /* Page fault */
459 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
460 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
461 TRAP_x86_MCHK = 18, /* Machine check exception */
462 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
463 otherwise Cache flush exception (via SIGSEV) */
464 #endif
465 };
466
467 /* Exception record for handling exceptions happening inside exception handlers */
468 typedef struct
469 {
470 EXCEPTION_REGISTRATION_RECORD frame;
471 EXCEPTION_REGISTRATION_RECORD *prevFrame;
472 } EXC_NESTED_FRAME;
473
474 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
475 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
476 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
477
478 /***********************************************************************
479 * dispatch_signal
480 */
481 static inline int dispatch_signal(unsigned int sig)
482 {
483 if (handlers[sig] == NULL) return 0;
484 return handlers[sig](sig);
485 }
486
487
488 /***********************************************************************
489 * get_trap_code
490 *
491 * Get the trap code for a signal.
492 */
493 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
494 {
495 #ifdef TRAP_sig
496 return TRAP_sig(sigcontext);
497 #else
498 return TRAP_x86_UNKNOWN; /* unknown trap code */
499 #endif
500 }
501
502 /***********************************************************************
503 * get_error_code
504 *
505 * Get the error code for a signal.
506 */
507 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
508 {
509 #ifdef ERROR_sig
510 return ERROR_sig(sigcontext);
511 #else
512 return 0;
513 #endif
514 }
515
516 /***********************************************************************
517 * get_signal_stack
518 *
519 * Get the base of the signal stack for the current thread.
520 */
521 static inline void *get_signal_stack(void)
522 {
523 return (char *)NtCurrentTeb() + 4096;
524 }
525
526
527 /***********************************************************************
528 * get_current_teb
529 *
530 * Get the current teb based on the stack pointer.
531 */
532 static inline TEB *get_current_teb(void)
533 {
534 unsigned long esp;
535 __asm__("movl %%esp,%0" : "=g" (esp) );
536 return (TEB *)(esp & ~signal_stack_mask);
537 }
538
539
540 /*******************************************************************
541 * is_valid_frame
542 */
543 static inline BOOL is_valid_frame( void *frame )
544 {
545 if ((ULONG_PTR)frame & 3) return FALSE;
546 return (frame >= NtCurrentTeb()->Tib.StackLimit &&
547 (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
548 }
549
550 /*******************************************************************
551 * raise_handler
552 *
553 * Handler for exceptions happening inside a handler.
554 */
555 static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
556 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
557 {
558 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
559 return ExceptionContinueSearch;
560 /* We shouldn't get here so we store faulty frame in dispatcher */
561 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
562 return ExceptionNestedException;
563 }
564
565
566 /*******************************************************************
567 * unwind_handler
568 *
569 * Handler for exceptions happening inside an unwind handler.
570 */
571 static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
572 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
573 {
574 if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
575 return ExceptionContinueSearch;
576 /* We shouldn't get here so we store faulty frame in dispatcher */
577 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
578 return ExceptionCollidedUnwind;
579 }
580
581
582 /**********************************************************************
583 * call_stack_handlers
584 *
585 * Call the stack handlers chain.
586 */
587 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
588 {
589 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
590 DWORD res;
591
592 frame = NtCurrentTeb()->Tib.ExceptionList;
593 nested_frame = NULL;
594 while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
595 {
596 /* Check frame address */
597 if (!is_valid_frame( frame ))
598 {
599 rec->ExceptionFlags |= EH_STACK_INVALID;
600 break;
601 }
602
603 /* Call handler */
604 TRACE( "calling handler at %p code=%x flags=%x\n",
605 frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
606 res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
607 TRACE( "handler at %p returned %x\n", frame->Handler, res );
608
609 if (frame == nested_frame)
610 {
611 /* no longer nested */
612 nested_frame = NULL;
613 rec->ExceptionFlags &= ~EH_NESTED_CALL;
614 }
615
616 switch(res)
617 {
618 case ExceptionContinueExecution:
619 if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
620 return STATUS_NONCONTINUABLE_EXCEPTION;
621 case ExceptionContinueSearch:
622 break;
623 case ExceptionNestedException:
624 if (nested_frame < dispatch) nested_frame = dispatch;
625 rec->ExceptionFlags |= EH_NESTED_CALL;
626 break;
627 default:
628 return STATUS_INVALID_DISPOSITION;
629 }
630 frame = frame->Prev;
631 }
632 return STATUS_UNHANDLED_EXCEPTION;
633 }
634
635
636 /*******************************************************************
637 * raise_exception
638 *
639 * Implementation of NtRaiseException.
640 */
641 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
642 {
643 NTSTATUS status;
644
645 if (first_chance)
646 {
647 DWORD c;
648
649 TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
650 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
651 context->Eip, GetCurrentThreadId() );
652 for (c = 0; c < rec->NumberParameters; c++)
653 TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
654 if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
655 {
656 if (rec->ExceptionInformation[1] >> 16)
657 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
658 rec->ExceptionAddress,
659 (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
660 else
661 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
662 rec->ExceptionAddress,
663 (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
664 }
665 else
666 {
667 TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
668 context->Eax, context->Ebx, context->Ecx,
669 context->Edx, context->Esi, context->Edi );
670 TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
671 context->Ebp, context->Esp, context->SegCs, context->SegDs,
672 context->SegEs, context->SegFs, context->SegGs, context->EFlags );
673 }
674 status = send_debug_event( rec, TRUE, context );
675 if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
676 return STATUS_SUCCESS;
677
678 /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
679 if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
680
681 if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
682 return STATUS_SUCCESS;
683
684 if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
685 return status;
686 }
687
688 /* last chance exception */
689
690 status = send_debug_event( rec, FALSE, context );
691 if (status != DBG_CONTINUE)
692 {
693 if (rec->ExceptionFlags & EH_STACK_INVALID)
694 WINE_ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
695 else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
696 WINE_ERR("Process attempted to continue execution after noncontinuable exception.\n");
697 else
698 WINE_ERR("Unhandled exception code %x flags %x addr %p\n",
699 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
700 NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
701 }
702 return STATUS_SUCCESS;
703 }
704
705
706 #ifdef __HAVE_VM86
707 /***********************************************************************
708 * save_vm86_context
709 *
710 * Set the register values from a vm86 structure.
711 */
712 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
713 {
714 context->ContextFlags = CONTEXT_FULL;
715 context->Eax = vm86->regs.eax;
716 context->Ebx = vm86->regs.ebx;
717 context->Ecx = vm86->regs.ecx;
718 context->Edx = vm86->regs.edx;
719 context->Esi = vm86->regs.esi;
720 context->Edi = vm86->regs.edi;
721 context->Esp = vm86->regs.esp;
722 context->Ebp = vm86->regs.ebp;
723 context->Eip = vm86->regs.eip;
724 context->SegCs = vm86->regs.cs;
725 context->SegDs = vm86->regs.ds;
726 context->SegEs = vm86->regs.es;
727 context->SegFs = vm86->regs.fs;
728 context->SegGs = vm86->regs.gs;
729 context->SegSs = vm86->regs.ss;
730 context->EFlags = vm86->regs.eflags;
731 }
732
733
734 /***********************************************************************
735 * restore_vm86_context
736 *
737 * Build a vm86 structure from the register values.
738 */
739 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
740 {
741 vm86->regs.eax = context->Eax;
742 vm86->regs.ebx = context->Ebx;
743 vm86->regs.ecx = context->Ecx;
744 vm86->regs.edx = context->Edx;
745 vm86->regs.esi = context->Esi;
746 vm86->regs.edi = context->Edi;
747 vm86->regs.esp = context->Esp;
748 vm86->regs.ebp = context->Ebp;
749 vm86->regs.eip = context->Eip;
750 vm86->regs.cs = context->SegCs;
751 vm86->regs.ds = context->SegDs;
752 vm86->regs.es = context->SegEs;
753 vm86->regs.fs = context->SegFs;
754 vm86->regs.gs = context->SegGs;
755 vm86->regs.ss = context->SegSs;
756 vm86->regs.eflags = context->EFlags;
757 }
758
759
760 /**********************************************************************
761 * merge_vm86_pending_flags
762 *
763 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
764 * raises exception if there are pending events and VIF flag
765 * has been turned on.
766 *
767 * Called from __wine_enter_vm86 because vm86_enter
768 * doesn't check for pending events.
769 *
770 * Called from raise_vm86_sti_exception to check for
771 * pending events in a signal safe way.
772 */
773 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
774 {
775 BOOL check_pending = TRUE;
776 struct vm86plus_struct *vm86 =
777 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
778
779 /*
780 * In order to prevent a race when SIGUSR2 occurs while
781 * we are returning from exception handler, pending events
782 * will be rechecked after each raised exception.
783 */
784 while (check_pending && get_vm86_teb_info()->vm86_pending)
785 {
786 check_pending = FALSE;
787 ntdll_get_thread_data()->vm86_ptr = NULL;
788
789 /*
790 * If VIF is set, throw exception.
791 * Note that SIGUSR2 may turn VIF flag off so
792 * VIF check must occur only when TEB.vm86_ptr is NULL.
793 */
794 if (vm86->regs.eflags & VIF_FLAG)
795 {
796 CONTEXT vcontext;
797 save_vm86_context( &vcontext, vm86 );
798
799 rec->ExceptionCode = EXCEPTION_VM86_STI;
800 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
801 rec->ExceptionRecord = NULL;
802 rec->NumberParameters = 0;
803 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
804
805 vcontext.EFlags &= ~VIP_FLAG;
806 get_vm86_teb_info()->vm86_pending = 0;
807 raise_exception( rec, &vcontext, TRUE );
808
809 restore_vm86_context( &vcontext, vm86 );
810 check_pending = TRUE;
811 }
812
813 ntdll_get_thread_data()->vm86_ptr = vm86;
814 }
815
816 /*
817 * Merge VIP flags in a signal safe way. This requires
818 * that the following operation compiles into atomic
819 * instruction.
820 */
821 vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
822 }
823 #endif /* __HAVE_VM86 */
824
825
826 #ifdef __sun
827
828 /* We have to workaround two Solaris breakages:
829 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
830 * code crash badly.
831 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
832 * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
833 */
834
835 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
836 __ASM_GLOBAL_FUNC( sigaction_syscall,
837 "movl $0x62,%eax\n\t"
838 "int $0x91\n\t"
839 "ret" )
840
841 /* assume the same libc handler is used for all signals */
842 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
843
844 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
845 {
846 struct ntdll_thread_data *thread_data;
847
848 __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
849
850 thread_data = (struct ntdll_thread_data *)get_current_teb()->SpareBytes1;
851 wine_set_fs( thread_data->fs );
852 wine_set_gs( thread_data->gs );
853
854 libc_sigacthandler( signal, siginfo, sigcontext );
855 }
856
857 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
858 {
859 struct sigaction real_act;
860
861 if (sigaction( sig, new, old ) == -1) return -1;
862
863 /* retrieve the real handler and flags with a direct syscall */
864 sigaction_syscall( sig, NULL, &real_act );
865 libc_sigacthandler = real_act.sa_sigaction;
866 real_act.sa_sigaction = wine_sigacthandler;
867 sigaction_syscall( sig, &real_act, NULL );
868 return 0;
869 }
870 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
871
872 #endif
873
874 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
875
876 extern void clear_alignment_flag(void);
877 __ASM_GLOBAL_FUNC( clear_alignment_flag,
878 "pushfl\n\t"
879 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
880 "andl $~0x40000,(%esp)\n\t"
881 "popfl\n\t"
882 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
883 "ret" )
884
885
886 /***********************************************************************
887 * init_handler
888 *
889 * Handler initialization when the full context is not needed.
890 * Return the stack pointer to use for pushing the exception data.
891 */
892 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
893 {
894 TEB *teb = get_current_teb();
895
896 clear_alignment_flag();
897
898 /* get %fs and %gs at time of the fault */
899 #ifdef FS_sig
900 *fs = LOWORD(FS_sig(sigcontext));
901 #else
902 *fs = wine_get_fs();
903 #endif
904 #ifdef GS_sig
905 *gs = LOWORD(GS_sig(sigcontext));
906 #else
907 *gs = wine_get_gs();
908 #endif
909
910 #ifndef __sun /* see above for Solaris handling */
911 {
912 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
913 wine_set_fs( thread_data->fs );
914 wine_set_gs( thread_data->gs );
915 }
916 #endif
917
918 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
919 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
920 {
921 /*
922 * Win16 or DOS protected mode. Note that during switch
923 * from 16-bit mode to linear mode, CS may be set to system
924 * segment before FS is restored. Fortunately, in this case
925 * SS is still non-system segment. This is why both CS and SS
926 * are checked.
927 */
928 return teb->WOW32Reserved;
929 }
930 return (void *)(ESP_sig(sigcontext) & ~3);
931 }
932
933
934 /***********************************************************************
935 * save_fpu
936 *
937 * Save the thread FPU context.
938 */
939 static inline void save_fpu( CONTEXT *context )
940 {
941 #ifdef __GNUC__
942 context->ContextFlags |= CONTEXT_FLOATING_POINT;
943 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
944 #endif
945 }
946
947
948 /***********************************************************************
949 * save_fpux
950 *
951 * Save the thread FPU extended context.
952 */
953 static inline void save_fpux( CONTEXT *context )
954 {
955 #ifdef __GNUC__
956 /* we have to enforce alignment by hand */
957 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
958 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
959
960 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
961 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
962 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
963 #endif
964 }
965
966
967 /***********************************************************************
968 * restore_fpu
969 *
970 * Restore the FPU context to a sigcontext.
971 */
972 static inline void restore_fpu( const CONTEXT *context )
973 {
974 FLOATING_SAVE_AREA float_status = context->FloatSave;
975 /* reset the current interrupt status */
976 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
977 #ifdef __GNUC__
978 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
979 #endif /* __GNUC__ */
980 }
981
982
983 /***********************************************************************
984 * restore_fpux
985 *
986 * Restore the FPU extended context to a sigcontext.
987 */
988 static inline void restore_fpux( const CONTEXT *context )
989 {
990 #ifdef __GNUC__
991 /* we have to enforce alignment by hand */
992 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
993 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
994
995 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
996 /* reset the current interrupt status */
997 state->StatusWord &= state->ControlWord | 0xff80;
998 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
999 #endif
1000 }
1001
1002
1003 /***********************************************************************
1004 * fpux_to_fpu
1005 *
1006 * Build a standard FPU context from an extended one.
1007 */
1008 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
1009 {
1010 unsigned int i, tag, stack_top;
1011
1012 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
1013 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
1014 fpu->ErrorOffset = fpux->ErrorOffset;
1015 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
1016 fpu->DataOffset = fpux->DataOffset;
1017 fpu->DataSelector = fpux->DataSelector;
1018 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
1019
1020 stack_top = (fpux->StatusWord >> 11) & 7;
1021 fpu->TagWord = 0xffff0000;
1022 for (i = 0; i < 8; i++)
1023 {
1024 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
1025 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
1026 else
1027 {
1028 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
1029 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
1030 {
1031 tag = 2; /* special */
1032 }
1033 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
1034 {
1035 if (reg->Low) tag = 2; /* special */
1036 else tag = 1; /* zero */
1037 }
1038 else
1039 {
1040 if (reg->Low >> 63) tag = 0; /* valid */
1041 else tag = 2; /* special */
1042 }
1043 }
1044 fpu->TagWord |= tag << (2 * i);
1045 }
1046 }
1047
1048
1049 /***********************************************************************
1050 * save_context
1051 *
1052 * Build a context structure from the signal info.
1053 */
1054 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
1055 {
1056 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1057 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1058 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1059
1060 memset(context, 0, sizeof(*context));
1061 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
1062 context->Eax = EAX_sig(sigcontext);
1063 context->Ebx = EBX_sig(sigcontext);
1064 context->Ecx = ECX_sig(sigcontext);
1065 context->Edx = EDX_sig(sigcontext);
1066 context->Esi = ESI_sig(sigcontext);
1067 context->Edi = EDI_sig(sigcontext);
1068 context->Ebp = EBP_sig(sigcontext);
1069 context->EFlags = EFL_sig(sigcontext);
1070 context->Eip = EIP_sig(sigcontext);
1071 context->Esp = ESP_sig(sigcontext);
1072 context->SegCs = LOWORD(CS_sig(sigcontext));
1073 context->SegDs = LOWORD(DS_sig(sigcontext));
1074 context->SegEs = LOWORD(ES_sig(sigcontext));
1075 context->SegFs = fs;
1076 context->SegGs = gs;
1077 context->SegSs = LOWORD(SS_sig(sigcontext));
1078 context->Dr0 = regs->dr0;
1079 context->Dr1 = regs->dr1;
1080 context->Dr2 = regs->dr2;
1081 context->Dr3 = regs->dr3;
1082 context->Dr6 = regs->dr6;
1083 context->Dr7 = regs->dr7;
1084
1085 if (fpu)
1086 {
1087 context->ContextFlags |= CONTEXT_FLOATING_POINT;
1088 context->FloatSave = *fpu;
1089 }
1090 if (fpux)
1091 {
1092 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
1093 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
1094 fpux_support = 1;
1095 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
1096 }
1097 if (!fpu && !fpux) save_fpu( context );
1098 }
1099
1100
1101 /***********************************************************************
1102 * restore_context
1103 *
1104 * Restore the signal info from the context.
1105 */
1106 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
1107 {
1108 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1109 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1110 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1111
1112 regs->dr0 = context->Dr0;
1113 regs->dr1 = context->Dr1;
1114 regs->dr2 = context->Dr2;
1115 regs->dr3 = context->Dr3;
1116 regs->dr6 = context->Dr6;
1117 regs->dr7 = context->Dr7;
1118 EAX_sig(sigcontext) = context->Eax;
1119 EBX_sig(sigcontext) = context->Ebx;
1120 ECX_sig(sigcontext) = context->Ecx;
1121 EDX_sig(sigcontext) = context->Edx;
1122 ESI_sig(sigcontext) = context->Esi;
1123 EDI_sig(sigcontext) = context->Edi;
1124 EBP_sig(sigcontext) = context->Ebp;
1125 EFL_sig(sigcontext) = context->EFlags;
1126 EIP_sig(sigcontext) = context->Eip;
1127 ESP_sig(sigcontext) = context->Esp;
1128 CS_sig(sigcontext) = context->SegCs;
1129 DS_sig(sigcontext) = context->SegDs;
1130 ES_sig(sigcontext) = context->SegEs;
1131 SS_sig(sigcontext) = context->SegSs;
1132 #ifdef GS_sig
1133 GS_sig(sigcontext) = context->SegGs;
1134 #else
1135 wine_set_gs( context->SegGs );
1136 #endif
1137 #ifdef FS_sig
1138 FS_sig(sigcontext) = context->SegFs;
1139 #else
1140 wine_set_fs( context->SegFs );
1141 #endif
1142
1143 if (fpu) *fpu = context->FloatSave;
1144 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
1145 if (!fpu && !fpux) restore_fpu( context );
1146 }
1147
1148
1149 /***********************************************************************
1150 * RtlCaptureContext (NTDLL.@)
1151 */
1152 __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
1153 "pushl %eax\n\t"
1154 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
1155 "movl 8(%esp),%eax\n\t" /* context */
1156 "movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
1157 "movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
1158 "movw %fs,0x90(%eax)\n\t" /* context->SegFs */
1159 "movw %es,0x94(%eax)\n\t" /* context->SegEs */
1160 "movw %ds,0x98(%eax)\n\t" /* context->SegDs */
1161 "movl %edi,0x9c(%eax)\n\t" /* context->Edi */
1162 "movl %esi,0xa0(%eax)\n\t" /* context->Esi */
1163 "movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
1164 "movl %edx,0xa8(%eax)\n\t" /* context->Edx */
1165 "movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
1166 "movl %ebp,0xb4(%eax)\n\t" /* context->Ebp */
1167 "movl 4(%esp),%edx\n\t"
1168 "movl %edx,0xb8(%eax)\n\t" /* context->Eip */
1169 "movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
1170 "pushfl\n\t"
1171 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
1172 "popl 0xc0(%eax)\n\t" /* context->EFlags */
1173 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
1174 "leal 8(%esp),%edx\n\t"
1175 "movl %edx,0xc4(%eax)\n\t" /* context->Esp */
1176 "movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
1177 "popl 0xb0(%eax)\n\t" /* context->Eax */
1178 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
1179 "ret $4" )
1180
1181
1182 /***********************************************************************
1183 * set_cpu_context
1184 *
1185 * Set the new CPU context. Used by NtSetContextThread.
1186 */
1187 void set_cpu_context( const CONTEXT *context )
1188 {
1189 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1190
1191 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
1192 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
1193
1194 if (flags & CONTEXT_DEBUG_REGISTERS)
1195 {
1196 ntdll_get_thread_data()->dr0 = context->Dr0;
1197 ntdll_get_thread_data()->dr1 = context->Dr1;
1198 ntdll_get_thread_data()->dr2 = context->Dr2;
1199 ntdll_get_thread_data()->dr3 = context->Dr3;
1200 ntdll_get_thread_data()->dr6 = context->Dr6;
1201 ntdll_get_thread_data()->dr7 = context->Dr7;
1202 }
1203 if (flags & CONTEXT_FULL)
1204 {
1205 if (!(flags & CONTEXT_CONTROL))
1206 FIXME( "setting partial context (%x) not supported\n", flags );
1207 else if (flags & CONTEXT_SEGMENTS)
1208 __wine_restore_regs( context );
1209 else
1210 {
1211 CONTEXT newcontext = *context;
1212 newcontext.SegDs = wine_get_ds();
1213 newcontext.SegEs = wine_get_es();
1214 newcontext.SegFs = wine_get_fs();
1215 newcontext.SegGs = wine_get_gs();
1216 __wine_restore_regs( &newcontext );
1217 }
1218 }
1219 }
1220
1221
1222 /***********************************************************************
1223 * set_debug_registers
1224 */
1225 static void set_debug_registers( const CONTEXT *context )
1226 {
1227 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1228 context_t server_context;
1229
1230 if (!(flags & CONTEXT_DEBUG_REGISTERS)) return;
1231 if (ntdll_get_thread_data()->dr0 == context->Dr0 &&
1232 ntdll_get_thread_data()->dr1 == context->Dr1 &&
1233 ntdll_get_thread_data()->dr2 == context->Dr2 &&
1234 ntdll_get_thread_data()->dr3 == context->Dr3 &&
1235 ntdll_get_thread_data()->dr6 == context->Dr6 &&
1236 ntdll_get_thread_data()->dr7 == context->Dr7) return;
1237
1238 context_to_server( &server_context, context );
1239
1240 SERVER_START_REQ( set_thread_context )
1241 {
1242 req->handle = wine_server_obj_handle( GetCurrentThread() );
1243 req->suspend = 0;
1244 wine_server_add_data( req, &server_context, sizeof(server_context) );
1245 wine_server_call( req );
1246 }
1247 SERVER_END_REQ;
1248 }
1249
1250
1251 /***********************************************************************
1252 * copy_context
1253 *
1254 * Copy a register context according to the flags.
1255 */
1256 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
1257 {
1258 flags &= ~CONTEXT_i386; /* get rid of CPU id */
1259 if (flags & CONTEXT_INTEGER)
1260 {
1261 to->Eax = from->Eax;
1262 to->Ebx = from->Ebx;
1263 to->Ecx = from->Ecx;
1264 to->Edx = from->Edx;
1265 to->Esi = from->Esi;
1266 to->Edi = from->Edi;
1267 }
1268 if (flags & CONTEXT_CONTROL)
1269 {
1270 to->Ebp = from->Ebp;
1271 to->Esp = from->Esp;
1272 to->Eip = from->Eip;
1273 to->SegCs = from->SegCs;
1274 to->SegSs = from->SegSs;
1275 to->EFlags = from->EFlags;
1276 }
1277 if (flags & CONTEXT_SEGMENTS)
1278 {
1279 to->SegDs = from->SegDs;
1280 to->SegEs = from->SegEs;
1281 to->SegFs = from->SegFs;
1282 to->SegGs = from->SegGs;
1283 }
1284 if (flags & CONTEXT_DEBUG_REGISTERS)
1285 {
1286 to->Dr0 = from->Dr0;
1287 to->Dr1 = from->Dr1;
1288 to->Dr2 = from->Dr2;
1289 to->Dr3 = from->Dr3;
1290 to->Dr6 = from->Dr6;
1291 to->Dr7 = from->Dr7;
1292 }
1293 if (flags & CONTEXT_FLOATING_POINT)
1294 {
1295 to->FloatSave = from->FloatSave;
1296 }
1297 if (flags & CONTEXT_EXTENDED_REGISTERS)
1298 {
1299 memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
1300 }
1301 }
1302
1303
1304 /***********************************************************************
1305 * context_to_server
1306 *
1307 * Convert a register context to the server format.
1308 */
1309 NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
1310 {
1311 DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
1312
1313 memset( to, 0, sizeof(*to) );
1314 to->cpu = CPU_x86;
1315
1316 if (flags & CONTEXT_CONTROL)
1317 {
1318 to->flags |= SERVER_CTX_CONTROL;
1319 to->ctl.i386_regs.ebp = from->Ebp;
1320 to->ctl.i386_regs.esp = from->Esp;
1321 to->ctl.i386_regs.eip = from->Eip;
1322 to->ctl.i386_regs.cs = from->SegCs;
1323 to->ctl.i386_regs.ss = from->SegSs;
1324 to->ctl.i386_regs.eflags = from->EFlags;
1325 }
1326 if (flags & CONTEXT_INTEGER)
1327 {
1328 to->flags |= SERVER_CTX_INTEGER;
1329 to->integer.i386_regs.eax = from->Eax;
1330 to->integer.i386_regs.ebx = from->Ebx;
1331 to->integer.i386_regs.ecx = from->Ecx;
1332 to->integer.i386_regs.edx = from->Edx;
1333 to->integer.i386_regs.esi = from->Esi;
1334 to->integer.i386_regs.edi = from->Edi;
1335 }
1336 if (flags & CONTEXT_SEGMENTS)
1337 {
1338 to->flags |= SERVER_CTX_SEGMENTS;
1339 to->seg.i386_regs.ds = from->SegDs;
1340 to->seg.i386_regs.es = from->SegEs;
1341 to->seg.i386_regs.fs = from->SegFs;
1342 to->seg.i386_regs.gs = from->SegGs;
1343 }
1344 if (flags & CONTEXT_FLOATING_POINT)
1345 {
1346 to->flags |= SERVER_CTX_FLOATING_POINT;
1347 to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
1348 to->fp.i386_regs.status = from->FloatSave.StatusWord;
1349 to->fp.i386_regs.tag = from->FloatSave.TagWord;
1350 to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
1351 to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
1352 to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
1353 to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
1354 to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
1355 memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
1356 }
1357 if (flags & CONTEXT_DEBUG_REGISTERS)
1358 {
1359 to->flags |= SERVER_CTX_DEBUG_REGISTERS;
1360 to->debug.i386_regs.dr0 = from->Dr0;
1361 to->debug.i386_regs.dr1 = from->Dr1;
1362 to->debug.i386_regs.dr2 = from->Dr2;
1363 to->debug.i386_regs.dr3 = from->Dr3;
1364 to->debug.i386_regs.dr6 = from->Dr6;
1365 to->debug.i386_regs.dr7 = from->Dr7;
1366 }
1367 if (flags & CONTEXT_EXTENDED_REGISTERS)
1368 {
1369 to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
1370 memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
1371 }
1372 return STATUS_SUCCESS;
1373 }
1374
1375
1376 /***********************************************************************
1377 * context_from_server
1378 *
1379 * Convert a register context from the server format.
1380 */
1381 NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
1382 {
1383 if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
1384
1385 to->ContextFlags = CONTEXT_i386;
1386 if (from->flags & SERVER_CTX_CONTROL)
1387 {
1388 to->ContextFlags |= CONTEXT_CONTROL;
1389 to->Ebp = from->ctl.i386_regs.ebp;
1390 to->Esp = from->ctl.i386_regs.esp;
1391 to->Eip = from->ctl.i386_regs.eip;
1392 to->SegCs = from->ctl.i386_regs.cs;
1393 to->SegSs = from->ctl.i386_regs.ss;
1394 to->EFlags = from->ctl.i386_regs.eflags;
1395 }
1396 if (from->flags & SERVER_CTX_INTEGER)
1397 {
1398 to->ContextFlags |= CONTEXT_INTEGER;
1399 to->Eax = from->integer.i386_regs.eax;
1400 to->Ebx = from->integer.i386_regs.ebx;
1401 to->Ecx = from->integer.i386_regs.ecx;
1402 to->Edx = from->integer.i386_regs.edx;
1403 to->Esi = from->integer.i386_regs.esi;
1404 to->Edi = from->integer.i386_regs.edi;
1405 }
1406 if (from->flags & SERVER_CTX_SEGMENTS)
1407 {
1408 to->ContextFlags |= CONTEXT_SEGMENTS;
1409 to->SegDs = from->seg.i386_regs.ds;
1410 to->SegEs = from->seg.i386_regs.es;
1411 to->SegFs = from->seg.i386_regs.fs;
1412 to->SegGs = from->seg.i386_regs.gs;
1413 }
1414 if (from->flags & SERVER_CTX_FLOATING_POINT)
1415 {
1416 to->ContextFlags |= CONTEXT_FLOATING_POINT;
1417 to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
1418 to->FloatSave.StatusWord = from->fp.i386_regs.status;
1419 to->FloatSave.TagWord = from->fp.i386_regs.tag;
1420 to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
1421 to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
1422 to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
1423 to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
1424 to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
1425 memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
1426 }
1427 if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
1428 {
1429 to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
1430 to->Dr0 = from->debug.i386_regs.dr0;
1431 to->Dr1 = from->debug.i386_regs.dr1;
1432 to->Dr2 = from->debug.i386_regs.dr2;
1433 to->Dr3 = from->debug.i386_regs.dr3;
1434 to->Dr6 = from->debug.i386_regs.dr6;
1435 to->Dr7 = from->debug.i386_regs.dr7;
1436 }
1437 if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
1438 {
1439 to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
1440 memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
1441 }
1442 return STATUS_SUCCESS;
1443 }
1444
1445
1446 /***********************************************************************
1447 * is_privileged_instr
1448 *
1449 * Check if the fault location is a privileged instruction.
1450 * Based on the instruction emulation code in dlls/kernel/instr.c.
1451 */
1452 static inline DWORD is_privileged_instr( CONTEXT *context )
1453 {
1454 const BYTE *instr;
1455 unsigned int prefix_count = 0;
1456
1457 if (!wine_ldt_is_system( context->SegCs )) return 0;
1458 instr = (BYTE *)context->Eip;
1459
1460 for (;;) switch(*instr)
1461 {
1462 /* instruction prefixes */
1463 case 0x2e: /* %cs: */
1464 case 0x36: /* %ss: */
1465 case 0x3e: /* %ds: */
1466 case 0x26: /* %es: */
1467 case 0x64: /* %fs: */
1468 case 0x65: /* %gs: */
1469 case 0x66: /* opcode size */
1470 case 0x67: /* addr size */
1471 case 0xf0: /* lock */
1472 case 0xf2: /* repne */
1473 case 0xf3: /* repe */
1474 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1475 instr++;
1476 continue;
1477
1478 case 0x0f: /* extended instruction */
1479 switch(instr[1])
1480 {
1481 case 0x20: /* mov crX, reg */
1482 case 0x21: /* mov drX, reg */
1483 case 0x22: /* mov reg, crX */
1484 case 0x23: /* mov reg drX */
1485 return EXCEPTION_PRIV_INSTRUCTION;
1486 }
1487 return 0;
1488 case 0x6c: /* insb (%dx) */
1489 case 0x6d: /* insl (%dx) */
1490 case 0x6e: /* outsb (%dx) */
1491 case 0x6f: /* outsl (%dx) */
1492 case 0xcd: /* int $xx */
1493 case 0xe4: /* inb al,XX */
1494 case 0xe5: /* in (e)ax,XX */
1495 case 0xe6: /* outb XX,al */
1496 case 0xe7: /* out XX,(e)ax */
1497 case 0xec: /* inb (%dx),%al */
1498 case 0xed: /* inl (%dx),%eax */
1499 case 0xee: /* outb %al,(%dx) */
1500 case 0xef: /* outl %eax,(%dx) */
1501 case 0xf4: /* hlt */
1502 case 0xfa: /* cli */
1503 case 0xfb: /* sti */
1504 return EXCEPTION_PRIV_INSTRUCTION;
1505 default:
1506 return 0;
1507 }
1508 }
1509
1510
1511 #include "pshpack1.h"
1512 struct atl_thunk
1513 {
1514 DWORD movl; /* movl this,4(%esp) */
1515 DWORD this;
1516 BYTE jmp; /* jmp func */
1517 int func;
1518 };
1519 #include "poppack.h"
1520
1521 /**********************************************************************
1522 * check_atl_thunk
1523 *
1524 * Check if code destination is an ATL thunk, and emulate it if so.
1525 */
1526 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1527 {
1528 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1529 BOOL ret = FALSE;
1530
1531 __TRY
1532 {
1533 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1534 {
1535 *((DWORD *)context->Esp + 1) = thunk->this;
1536 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1537 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1538 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1539 ret = TRUE;
1540 }
1541 }
1542 __EXCEPT_PAGE_FAULT
1543 {
1544 return FALSE;
1545 }
1546 __ENDTRY
1547 return ret;
1548 }
1549
1550
1551 /***********************************************************************
1552 * setup_exception_record
1553 *
1554 * Setup the exception record and context on the thread stack.
1555 */
1556 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1557 WORD fs, WORD gs, raise_func func )
1558 {
1559 struct stack_layout
1560 {
1561 void *ret_addr; /* return address from raise_func */
1562 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1563 CONTEXT *context_ptr; /* second arg for raise_func */
1564 CONTEXT context;
1565 EXCEPTION_RECORD rec;
1566 DWORD ebp;
1567 DWORD eip;
1568 } *stack = stack_ptr;
1569 DWORD exception_code = 0;
1570
1571 /* stack sanity checks */
1572
1573 if ((char *)stack >= (char *)get_signal_stack() &&
1574 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1575 {
1576 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1577 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1578 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1579 NtCurrentTeb()->Tib.StackBase );
1580 abort_thread(1);
1581 }
1582
1583 if (stack - 1 > stack || /* check for overflow in subtraction */
1584 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1585 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1586 {
1587 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1588 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1589 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1590 NtCurrentTeb()->Tib.StackBase );
1591 }
1592 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1593 {
1594 /* stack overflow on last page, unrecoverable */
1595 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1596 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1597 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1598 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1599 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1600 abort_thread(1);
1601 }
1602 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1603 {
1604 /* stack access below stack limit, may be recoverable */
1605 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1606 else
1607 {
1608 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1609 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1610 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1611 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1612 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1613 abort_thread(1);
1614 }
1615 }
1616
1617 stack--; /* push the stack_layout structure */
1618 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1619 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1620 #elif defined(VALGRIND_MAKE_WRITABLE)
1621 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1622 #endif
1623 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1624 stack->rec_ptr = &stack->rec;
1625 stack->context_ptr = &stack->context;
1626
1627 stack->rec.ExceptionRecord = NULL;
1628 stack->rec.ExceptionCode = exception_code;
1629 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1630 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1631 stack->rec.NumberParameters = 0;
1632
1633 save_context( &stack->context, sigcontext, fs, gs );
1634
1635 /* now modify the sigcontext to return to the raise function */
1636 ESP_sig(sigcontext) = (DWORD)stack;
1637 EIP_sig(sigcontext) = (DWORD)func;
1638 /* clear single-step, direction, and align check flag */
1639 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1640 CS_sig(sigcontext) = wine_get_cs();
1641 DS_sig(sigcontext) = wine_get_ds();
1642 ES_sig(sigcontext) = wine_get_es();
1643 FS_sig(sigcontext) = wine_get_fs();
1644 GS_sig(sigcontext) = wine_get_gs();
1645 SS_sig(sigcontext) = wine_get_ss();
1646
1647 return stack->rec_ptr;
1648 }
1649
1650
1651 /***********************************************************************
1652 * setup_exception
1653 *
1654 * Setup a proper stack frame for the raise function, and modify the
1655 * sigcontext so that the return from the signal handler will call
1656 * the raise function.
1657 */
1658 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1659 {
1660 WORD fs, gs;
1661 void *stack = init_handler( sigcontext, &fs, &gs );
1662
1663 return setup_exception_record( sigcontext, stack, fs, gs, func );
1664 }
1665
1666
1667 /***********************************************************************
1668 * get_exception_context
1669 *
1670 * Get a pointer to the context built by setup_exception.
1671 */
1672 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1673 {
1674 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1675 }
1676
1677
1678 /**********************************************************************
1679 * get_fpu_code
1680 *
1681 * Get the FPU exception code from the FPU status.
1682 */
1683 static inline DWORD get_fpu_code( const CONTEXT *context )
1684 {
1685 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1686
1687 if (status & 0x01) /* IE */
1688 {
1689 if (status & 0x40) /* SF */
1690 return EXCEPTION_FLT_STACK_CHECK;
1691 else
1692 return EXCEPTION_FLT_INVALID_OPERATION;
1693 }
1694 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1695 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1696 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1697 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1698 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1699 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1700 }
1701
1702
1703 /**********************************************************************
1704 * raise_segv_exception
1705 */
1706 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1707 {
1708 NTSTATUS status;
1709
1710 switch(rec->ExceptionCode)
1711 {
1712 case EXCEPTION_ACCESS_VIOLATION:
1713 if (rec->NumberParameters == 2)
1714 {
1715 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1716 goto done;
1717 if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1718 rec->ExceptionInformation[0] )))
1719 goto done;
1720 /* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
1721 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
1722 {
1723 ULONG flags;
1724 NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
1725 &flags, sizeof(flags), NULL );
1726 if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
1727 rec->ExceptionInformation[0] = EXCEPTION_READ_FAULT;
1728 }
1729 }
1730 break;
1731 case EXCEPTION_DATATYPE_MISALIGNMENT:
1732 /* FIXME: pass through exception handler first? */
1733 if (context->EFlags & 0x00040000)
1734 {
1735 /* Disable AC flag, return */
1736 context->EFlags &= ~0x00040000;
1737 goto done;
1738 }
1739 break;
1740 }
1741 status = NtRaiseException( rec, context, TRUE );
1742 raise_status( status, rec );
1743 done:
1744 set_cpu_context( context );
1745 }
1746
1747
1748 /**********************************************************************
1749 * raise_trap_exception
1750 */
1751 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1752 {
1753 NTSTATUS status;
1754
1755 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1756 {
1757 /* when single stepping can't tell whether this is a hw bp or a
1758 * single step interrupt. try to avoid as much overhead as possible
1759 * and only do a server call if there is any hw bp enabled. */
1760
1761 if( !(context->EFlags & 0x100) || (ntdll_get_thread_data()->dr7 & 0xff) )
1762 {
1763 /* (possible) hardware breakpoint, fetch the debug registers */
1764 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1765 NtGetContextThread(GetCurrentThread(), context);
1766 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1767 }
1768
1769 context->EFlags &= ~0x100; /* clear single-step flag */
1770 }
1771
1772 status = NtRaiseException( rec, context, TRUE );
1773 raise_status( status, rec );
1774 }
1775
1776
1777 /**********************************************************************
1778 * raise_generic_exception
1779 *
1780 * Generic raise function for exceptions that don't need special treatment.
1781 */
1782 static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1783 {
1784 NTSTATUS status;
1785
1786 status = NtRaiseException( rec, context, TRUE );
1787 raise_status( status, rec );
1788 }
1789
1790
1791 #ifdef __HAVE_VM86
1792 /**********************************************************************
1793 * raise_vm86_sti_exception
1794 */
1795 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1796 {
1797 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1798 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1799
1800 if (ntdll_get_thread_data()->vm86_ptr)
1801 {
1802 if (((char*)context->Eip >= (char*)vm86_return) &&
1803 ((char*)context->Eip <= (char*)vm86_return_end) &&
1804 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1805 /* exiting from VM86, can't throw */
1806 goto done;
1807 }
1808 merge_vm86_pending_flags( rec );
1809 }
1810 else if (get_vm86_teb_info()->dpmi_vif &&
1811 !wine_ldt_is_system(context->SegCs) &&
1812 !wine_ldt_is_system(context->SegSs))
1813 {
1814 /* Executing DPMI code and virtual interrupts are enabled. */
1815 get_vm86_teb_info()->vm86_pending = 0;
1816 NtRaiseException( rec, context, TRUE );
1817 }
1818 done:
1819 set_cpu_context( context );
1820 }
1821
1822
1823 /**********************************************************************
1824 * usr2_handler
1825 *
1826 * Handler for SIGUSR2.
1827 * We use it to signal that the running __wine_enter_vm86() should
1828 * immediately set VIP_FLAG, causing pending events to be handled
1829 * as early as possible.
1830 */
1831 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1832 {
1833 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1834 rec->ExceptionCode = EXCEPTION_VM86_STI;
1835 }
1836 #endif /* __HAVE_VM86 */
1837
1838
1839 /**********************************************************************
1840 * segv_handler
1841 *
1842 * Handler for SIGSEGV and related errors.
1843 */
1844 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1845 {
1846 WORD fs, gs;
1847 EXCEPTION_RECORD *rec;
1848 SIGCONTEXT *context = sigcontext;
1849 void *stack = init_handler( sigcontext, &fs, &gs );
1850
1851 /* check for page fault inside the thread stack */
1852 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1853 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1854 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1855 virtual_handle_stack_fault( siginfo->si_addr ))
1856 {
1857 /* check if this was the last guard page */
1858 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1859 {
1860 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1861 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1862 }
1863 return;
1864 }
1865
1866 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1867 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1868
1869 switch(get_trap_code(context))
1870 {
1871 case TRAP_x86_OFLOW: /* Overflow exception */
1872 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1873 break;
1874 case TRAP_x86_BOUND: /* Bound range exception */
1875 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1876 break;
1877 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1878 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1879 break;
1880 case TRAP_x86_STKFLT: /* Stack fault */
1881 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1882 break;
1883 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1884 case TRAP_x86_PROTFLT: /* General protection fault */
1885 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1886 {
1887 WORD err = get_error_code(context);
1888 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1889 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1890 rec->NumberParameters = 2;
1891 rec->ExceptionInformation[0] = 0;
1892 /* if error contains a LDT selector, use that as fault address */
1893 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1894 rec->ExceptionInformation[1] = err & ~7;
1895 else
1896 rec->ExceptionInformation[1] = 0xffffffff;
1897 }
1898 break;
1899 case TRAP_x86_PAGEFLT: /* Page fault */
1900 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1901 rec->NumberParameters = 2;
1902 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1903 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1904 break;
1905 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1906 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1907 break;
1908 default:
1909 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1910 /* fall through */
1911 case TRAP_x86_NMI: /* NMI interrupt */
1912 case TRAP_x86_DNA: /* Device not available exception */
1913 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1914 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1915 case TRAP_x86_MCHK: /* Machine check exception */
1916 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1917 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1918 break;
1919 }
1920 }
1921
1922
1923 /**********************************************************************
1924 * trap_handler
1925 *
1926 * Handler for SIGTRAP.
1927 */
1928 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1929 {
1930 SIGCONTEXT *context = sigcontext;
1931 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1932
1933 switch(get_trap_code(context))
1934 {
1935 case TRAP_x86_TRCTRAP: /* Single-step exception */
1936 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1937 break;
1938 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1939 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1940 /* fall through */
1941 default:
1942 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1943 break;
1944 }
1945 }
1946
1947
1948 /**********************************************************************
1949 * fpe_handler
1950 *
1951 * Handler for SIGFPE.
1952 */
1953 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1954 {
1955 CONTEXT *win_context;
1956 SIGCONTEXT *context = sigcontext;
1957 EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );
1958
1959 win_context = get_exception_context( rec );
1960
1961 switch(get_trap_code(context))
1962 {
1963 case TRAP_x86_DIVIDE: /* Division by zero exception */
1964 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1965 break;
1966 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1967 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1968 break;
1969 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1970 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1971 rec->ExceptionCode = get_fpu_code( win_context );
1972 rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1973 break;
1974 case TRAP_x86_CACHEFLT: /* SIMD exception */
1975 /* TODO:
1976 * Behaviour only tested for divide-by-zero exceptions
1977 * Check for other SIMD exceptions as well */
1978 if(siginfo->si_code != FPE_FLTDIV)
1979 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1980 siginfo->si_code);
1981
1982 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1983 rec->NumberParameters = 1;
1984 /* no idea what meaning is actually behind this but that's what native does */
1985 rec->ExceptionInformation[0] = 0;
1986 break;
1987 default:
1988 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1989 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1990 break;
1991 }
1992 }
1993
1994
1995 /**********************************************************************
1996 * int_handler
1997 *
1998 * Handler for SIGINT.
1999 *
2000 * FIXME: should not be calling external functions on the signal stack.
2001 */
2002 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2003 {
2004 WORD fs, gs;
2005 init_handler( sigcontext, &fs, &gs );
2006 if (!dispatch_signal(SIGINT))
2007 {
2008 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
2009 rec->ExceptionCode = CONTROL_C_EXIT;
2010 }
2011 }
2012
2013 /**********************************************************************
2014 * abrt_handler
2015 *
2016 * Handler for SIGABRT.
2017 */
2018 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2019 {
2020 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
2021 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
2022 rec->ExceptionFlags = EH_NONCONTINUABLE;
2023 }
2024
2025
2026 /**********************************************************************
2027 * quit_handler
2028 *
2029 * Handler for SIGQUIT.
2030 */
2031 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2032 {
2033 WORD fs, gs;
2034 init_handler( sigcontext, &fs, &gs );
2035 abort_thread(0);
2036 }
2037
2038
2039 /**********************************************************************
2040 * usr1_handler
2041 *
2042 * Handler for SIGUSR1, used to signal a thread that it got suspended.
2043 */
2044 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2045 {
2046 CONTEXT context;
2047 WORD fs, gs;
2048
2049 init_handler( sigcontext, &fs, &gs );
2050 save_context( &context, sigcontext, fs, gs );
2051 wait_suspend( &context );
2052 restore_context( &context, sigcontext );
2053 }
2054
2055
2056 /***********************************************************************
2057 * __wine_set_signal_handler (NTDLL.@)
2058 */
2059 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
2060 {
2061 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
2062 if (handlers[sig] != NULL) return -2;
2063 handlers[sig] = wsh;
2064 return 0;
2065 }
2066
2067
2068 /***********************************************************************
2069 * locking for LDT routines
2070 */
2071 static RTL_CRITICAL_SECTION ldt_section;
2072 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
2073 {
2074 0, 0, &ldt_section,
2075 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
2076 0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
2077 };
2078 static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
2079 static sigset_t ldt_sigset;
2080
2081 static void ldt_lock(void)
2082 {
2083 sigset_t sigset;
2084
2085 pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
2086 RtlEnterCriticalSection( &ldt_section );
2087 if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
2088 }
2089
2090 static void ldt_unlock(void)
2091 {
2092 if (ldt_section.RecursionCount == 1)
2093 {
2094 sigset_t sigset = ldt_sigset;
2095 RtlLeaveCriticalSection( &ldt_section );
2096 pthread_sigmask( SIG_SETMASK, &sigset, NULL );
2097 }
2098 else RtlLeaveCriticalSection( &ldt_section );
2099 }
2100
2101
2102 /**********************************************************************
2103 * signal_alloc_thread
2104 */
2105 NTSTATUS signal_alloc_thread( TEB **teb )
2106 {
2107 static size_t sigstack_zero_bits;
2108 struct ntdll_thread_data *thread_data;
2109 struct ntdll_thread_data *parent_data = NULL;
2110 SIZE_T size;
2111 void *addr = NULL;
2112 NTSTATUS status;
2113
2114 if (!sigstack_zero_bits)
2115 {
2116 size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
2117 /* find the first power of two not smaller than min_size */
2118 sigstack_zero_bits = 12;
2119 while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
2120 signal_stack_mask = (1 << sigstack_zero_bits) - 1;
2121 signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
2122 }
2123 else parent_data = ntdll_get_thread_data();
2124
2125 size = signal_stack_mask + 1;
2126 if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
2127 &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
2128 {
2129 *teb = addr;
2130 (*teb)->Tib.Self = &(*teb)->Tib;
2131 (*teb)->Tib.ExceptionList = (void *)~0UL;
2132 thread_data = (struct ntdll_thread_data *)(*teb)->SpareBytes1;
2133 if (!(thread_data->fs = wine_ldt_alloc_fs()))
2134 {
2135 size = 0;
2136 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
2137 status = STATUS_TOO_MANY_THREADS;
2138 }
2139 if (parent_data)
2140 {
2141 /* inherit debug registers from parent thread */
2142 thread_data->dr0 = parent_data->dr0;
2143 thread_data->dr1 = parent_data->dr1;
2144 thread_data->dr2 = parent_data->dr2;
2145 thread_data->dr3 = parent_data->dr3;
2146 thread_data->dr6 = parent_data->dr6;
2147 thread_data->dr7 = parent_data->dr7;
2148 }
2149
2150 }
2151 return status;
2152 }
2153
2154
2155 /**********************************************************************
2156 * signal_free_thread
2157 */
2158 void signal_free_thread( TEB *teb )
2159 {
2160 SIZE_T size;
2161 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2162
2163 if (thread_data) wine_ldt_free_fs( thread_data->fs );
2164 if (teb->DeallocationStack)
2165 {
2166 size = 0;
2167 NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
2168 }
2169 size = 0;
2170 NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
2171 }
2172
2173
2174 /**********************************************************************
2175 * signal_init_thread
2176 */
2177 void signal_init_thread( TEB *teb )
2178 {
2179 const WORD fpu_cw = 0x27f;
2180 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2181 LDT_ENTRY fs_entry;
2182 stack_t ss;
2183
2184 #ifdef __APPLE__
2185 int mib[2], val = 1;
2186
2187 mib[0] = CTL_KERN;
2188 mib[1] = KERN_THALTSTACK;
2189 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
2190 #endif
2191
2192 ss.ss_sp = (char *)teb + teb_size;
2193 ss.ss_size = signal_stack_size;
2194 ss.ss_flags = 0;
2195 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
2196
2197 wine_ldt_set_base( &fs_entry, teb );
2198 wine_ldt_set_limit( &fs_entry, teb_size - 1 );
2199 wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
2200 wine_ldt_init_fs( thread_data->fs, &fs_entry );
2201 thread_data->gs = wine_get_gs();
2202
2203 #ifdef __GNUC__
2204 __asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
2205 #else
2206 FIXME("FPU setup not implemented for this platform.\n");
2207 #endif
2208 }
2209
2210 /**********************************************************************
2211 * signal_init_process
2212 */
2213 void signal_init_process(void)
2214 {
2215 struct sigaction sig_act;
2216
2217 sig_act.sa_mask = server_block_set;
2218 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
2219 #ifdef SA_ONSTACK
2220 sig_act.sa_flags |= SA_ONSTACK;
2221 #endif
2222
2223 sig_act.sa_sigaction = int_handler;
2224 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
2225 sig_act.sa_sigaction = fpe_handler;
2226 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
2227 sig_act.sa_sigaction = abrt_handler;
2228 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
2229 sig_act.sa_sigaction = quit_handler;
2230 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
2231 sig_act.sa_sigaction = usr1_handler;
2232 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
2233
2234 sig_act.sa_sigaction = segv_handler;
2235 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
2236 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
2237 #ifdef SIGBUS
2238 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
2239 #endif
2240
2241 #ifdef SIGTRAP
2242 sig_act.sa_sigaction = trap_handler;
2243 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
2244 #endif
2245
2246 #ifdef __HAVE_VM86
2247 sig_act.sa_sigaction = usr2_handler;
2248 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
2249 #endif
2250
2251 wine_ldt_init_locking( ldt_lock, ldt_unlock );
2252 return;
2253
2254 error:
2255 perror("sigaction");
2256 exit(1);
2257 }
2258
2259
2260 #ifdef __HAVE_VM86
2261 /**********************************************************************
2262 * __wine_enter_vm86 (NTDLL.@)
2263 *
2264 * Enter vm86 mode with the specified register context.
2265 */
2266 void __wine_enter_vm86( CONTEXT *context )
2267 {
2268 EXCEPTION_RECORD rec;
2269 int res;
2270 struct vm86plus_struct vm86;
2271
2272 memset( &vm86, 0, sizeof(vm86) );
2273 for (;;)
2274 {
2275 restore_vm86_context( context, &vm86 );
2276
2277 ntdll_get_thread_data()->vm86_ptr = &vm86;
2278 merge_vm86_pending_flags( &rec );
2279
2280 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
2281 if (res < 0)
2282 {
2283 errno = -res;
2284 return;
2285 }
2286
2287 save_vm86_context( context, &vm86 );
2288
2289 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
2290 rec.ExceptionRecord = NULL;
2291 rec.ExceptionAddress = (LPVOID)context->Eip;
2292 rec.NumberParameters = 0;
2293
2294 switch(VM86_TYPE(res))
2295 {
2296 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
2297 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
2298 break;
2299 case VM86_TRAP: /* return due to DOS-debugger request */
2300 switch(VM86_ARG(res))
2301 {
2302 case TRAP_x86_TRCTRAP: /* Single-step exception */
2303 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
2304 break;
2305 case TRAP_x86_BPTFLT: /* Breakpoint exception */
2306 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
2307 /* fall through */
2308 default:
2309 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
2310 break;
2311 }
2312 break;
2313 case VM86_INTx: /* int3/int x instruction (ARG = x) */
2314 rec.ExceptionCode = EXCEPTION_VM86_INTx;
2315 rec.NumberParameters = 1;
2316 rec.ExceptionInformation[0] = VM86_ARG(res);
2317 break;
2318 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
2319 context->EFlags |= VIF_FLAG;
2320 context->EFlags &= ~VIP_FLAG;
2321 get_vm86_teb_info()->vm86_pending = 0;
2322 rec.ExceptionCode = EXCEPTION_VM86_STI;
2323 break;
2324 case VM86_PICRETURN: /* return due to pending PIC request */
2325 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
2326 break;
2327 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
2328 default:
2329 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
2330 continue;
2331 }
2332 raise_exception( &rec, context, TRUE );
2333 }
2334 }
2335
2336 #else /* __HAVE_VM86 */
2337 /**********************************************************************
2338 * __wine_enter_vm86 (NTDLL.@)
2339 */
2340 void __wine_enter_vm86( CONTEXT *context )
2341 {
2342 MESSAGE("vm86 mode not supported on this platform\n");
2343 }
2344 #endif /* __HAVE_VM86 */
2345
2346
2347 /*******************************************************************
2348 * RtlUnwind (NTDLL.@)
2349 */
2350 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
2351 PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
2352 {
2353 EXCEPTION_RECORD record;
2354 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
2355 DWORD res;
2356
2357 context->Eax = (DWORD)retval;
2358
2359 /* build an exception record, if we do not have one */
2360 if (!pRecord)
2361 {
2362 record.ExceptionCode = STATUS_UNWIND;
2363 record.ExceptionFlags = 0;
2364 record.ExceptionRecord = NULL;
2365 record.ExceptionAddress = (void *)context->Eip;
2366 record.NumberParameters = 0;
2367 pRecord = &record;
2368 }
2369
2370 pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
2371
2372 TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
2373
2374 /* get chain of exception frames */
2375 frame = NtCurrentTeb()->Tib.ExceptionList;
2376 while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
2377 {
2378 /* Check frame address */
2379 if (pEndFrame && (frame > pEndFrame))
2380 raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
2381
2382 if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );
2383
2384 /* Call handler */
2385 TRACE( "calling handler at %p code=%x flags=%x\n",
2386 frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
2387 res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
2388 TRACE( "handler at %p returned %x\n", frame->Handler, res );
2389
2390 switch(res)
2391 {
2392 case ExceptionContinueSearch:
2393 break;
2394 case ExceptionCollidedUnwind:
2395 frame = dispatch;
2396 break;
2397 default:
2398 raise_status( STATUS_INVALID_DISPOSITION, pRecord );
2399 break;
2400 }
2401 frame = __wine_pop_frame( frame );
2402 }
2403 }
2404 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 4 )
2405
2406
2407 /*******************************************************************
2408 * NtRaiseException (NTDLL.@)
2409 */
2410 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
2411 {
2412 NTSTATUS status = raise_exception( rec, context, first_chance );
2413 if (status == STATUS_SUCCESS)
2414 {
2415 set_debug_registers( context );
2416 set_cpu_context( context );
2417 }
2418 return status;
2419 }
2420
2421
2422 /***********************************************************************
2423 * RtlRaiseException (NTDLL.@)
2424 */
2425 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
2426 {
2427 NTSTATUS status;
2428
2429 rec->ExceptionAddress = (void *)context->Eip;
2430 status = raise_exception( rec, context, TRUE );
2431 if (status != STATUS_SUCCESS) raise_status( status, rec );
2432 }
2433 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )
2434
2435
2436 /*************************************************************************
2437 * RtlCaptureStackBackTrace (NTDLL.@)
2438 */
2439 USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
2440 {
2441 CONTEXT context;
2442 ULONG i;
2443 ULONG *frame;
2444
2445 RtlCaptureContext( &context );
2446 if (hash) *hash = 0;
2447 frame = (ULONG *)context.Ebp;
2448
2449 while (skip--)
2450 {
2451 if (!is_valid_frame( frame )) return 0;
2452 frame = (ULONG *)*frame;
2453 }
2454
2455 for (i = 0; i < count; i++)
2456 {
2457 if (!is_valid_frame( frame )) break;
2458 buffer[i] = (void *)frame[1];
2459 if (hash) *hash += frame[1];
2460 frame = (ULONG *)*frame;
2461 }
2462 return i;
2463 }
2464
2465
2466 extern void DECLSPEC_NORETURN call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg );
2467 __ASM_GLOBAL_FUNC( call_thread_entry_point,
2468 "pushl %ebp\n\t"
2469 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2470 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2471 "movl %esp,%ebp\n\t"
2472 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2473 "pushl %ebx\n\t"
2474 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2475 "pushl %esi\n\t"
2476 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2477 "pushl %edi\n\t"
2478 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2479 "pushl %ebp\n\t"
2480 "pushl 12(%ebp)\n\t"
2481 "pushl 8(%ebp)\n\t"
2482 "call " __ASM_NAME("call_thread_func") );
2483
2484 extern void DECLSPEC_NORETURN call_thread_exit_func( int status, void (*func)(int), void *frame );
2485 __ASM_GLOBAL_FUNC( call_thread_exit_func,
2486 "movl 4(%esp),%eax\n\t"
2487 "movl 8(%esp),%ecx\n\t"
2488 "movl 12(%esp),%ebp\n\t"
2489 __ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
2490 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2491 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2492 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2493 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2494 "leal -20(%ebp),%esp\n\t"
2495 "pushl %eax\n\t"
2496 "call *%ecx" );
2497
2498 /* wrapper for apps that don't declare the thread function correctly */
2499 extern void DECLSPEC_NORETURN call_thread_func_wrapper( LPTHREAD_START_ROUTINE entry, void *arg );
2500 __ASM_GLOBAL_FUNC(call_thread_func_wrapper,
2501 "pushl %ebp\n\t"
2502 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2503 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2504 "movl %esp,%ebp\n\t"
2505 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2506 "subl $4,%esp\n\t"
2507 "pushl 12(%ebp)\n\t"
2508 "call *8(%ebp)\n\t"
2509 "leal -4(%ebp),%esp\n\t"
2510 "pushl %eax\n\t"
2511 "call " __ASM_NAME("exit_thread") "\n\t"
2512 "int $3" )
2513
2514 /***********************************************************************
2515 * call_thread_func
2516 */
2517 void call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg, void *frame )
2518 {
2519 ntdll_get_thread_data()->exit_frame = frame;
2520 __TRY
2521 {
2522 call_thread_func_wrapper( entry, arg );
2523 }
2524 __EXCEPT(unhandled_exception_filter)
2525 {
2526 NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
2527 }
2528 __ENDTRY
2529 abort(); /* should not be reached */
2530 }
2531
2532 /***********************************************************************
2533 * RtlExitUserThread (NTDLL.@)
2534 */
2535 void WINAPI RtlExitUserThread( ULONG status )
2536 {
2537 if (!ntdll_get_thread_data()->exit_frame) exit_thread( status );
2538 call_thread_exit_func( status, exit_thread, ntdll_get_thread_data()->exit_frame );
2539 }
2540
2541 /***********************************************************************
2542 * abort_thread
2543 */
2544 void abort_thread( int status )
2545 {
2546 if (!ntdll_get_thread_data()->exit_frame) terminate_thread( status );
2547 call_thread_exit_func( status, terminate_thread, ntdll_get_thread_data()->exit_frame );
2548 }
2549
2550 /**********************************************************************
2551 * DbgBreakPoint (NTDLL.@)
2552 */
2553 __ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
2554
2555 /**********************************************************************
2556 * DbgUserBreakPoint (NTDLL.@)
2557 */
2558 __ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
2559
2560 /**********************************************************************
2561 * NtCurrentTeb (NTDLL.@)
2562 */
2563 __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
2564
2565
2566 /**************************************************************************
2567 * _chkstk (NTDLL.@)
2568 */
2569 __ASM_STDCALL_FUNC( _chkstk, 0,
2570 "negl %eax\n\t"
2571 "addl %esp,%eax\n\t"
2572 "xchgl %esp,%eax\n\t"
2573 "movl 0(%eax),%eax\n\t" /* copy return address from old location */
2574 "movl %eax,0(%esp)\n\t"
2575 "ret" )
2576
2577 /**************************************************************************
2578 * _alloca_probe (NTDLL.@)
2579 */
2580 __ASM_STDCALL_FUNC( _alloca_probe, 0,
2581 "negl %eax\n\t"
2582 "addl %esp,%eax\n\t"
2583 "xchgl %esp,%eax\n\t"
2584 "movl 0(%eax),%eax\n\t" /* copy return address from old location */
2585 "movl %eax,0(%esp)\n\t"
2586 "ret" )
2587
2588
2589 /**********************************************************************
2590 * EXC_CallHandler (internal)
2591 *
2592 * Some exception handlers depend on EBP to have a fixed position relative to
2593 * the exception frame.
2594 * Shrinker depends on (*1) doing what it does,
2595 * (*2) being the exact instruction it is and (*3) beginning with 0x64
2596 * (i.e. the %fs prefix to the movl instruction). It also depends on the
2597 * function calling the handler having only 5 parameters (*4).
2598 */
2599 __ASM_GLOBAL_FUNC( EXC_CallHandler,
2600 "pushl %ebp\n\t"
2601 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2602 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2603 "movl %esp,%ebp\n\t"
2604 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2605 "pushl %ebx\n\t"
2606 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2607 "movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
2608 "pushl 24(%ebp)\n\t"
2609 "pushl 20(%ebp)\n\t"
2610 "pushl 16(%ebp)\n\t"
2611 "pushl 12(%ebp)\n\t"
2612 "pushl 8(%ebp)\n\t"
2613 "call " __ASM_NAME("call_exception_handler") "\n\t"
2614 "popl %ebx\n\t"
2615 __ASM_CFI(".cfi_same_value %ebx\n\t")
2616 "leave\n"
2617 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2618 __ASM_CFI(".cfi_same_value %ebp\n\t")
2619 "ret" )
2620 __ASM_GLOBAL_FUNC(call_exception_handler,
2621 "pushl %ebp\n\t"
2622 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2623 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2624 "movl %esp,%ebp\n\t"
2625 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2626 "subl $12,%esp\n\t"
2627 "pushl 12(%ebp)\n\t" /* make any exceptions in this... */
2628 "pushl %edx\n\t" /* handler be handled by... */
2629 ".byte 0x64\n\t"
2630 "pushl (0)\n\t" /* nested_handler (passed in edx). */
2631 ".byte 0x64\n\t"
2632 "movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
2633 "pushl 20(%ebp)\n\t"
2634 "pushl 16(%ebp)\n\t"
2635 "pushl 12(%ebp)\n\t"
2636 "pushl 8(%ebp)\n\t"
2637 "movl 24(%ebp), %ecx\n\t" /* (*1) */
2638 "call *%ecx\n\t" /* call handler. (*2) */
2639 ".byte 0x64\n\t"
2640 "movl (0), %esp\n\t" /* restore previous... (*3) */
2641 ".byte 0x64\n\t"
2642 "popl (0)\n\t" /* exception frame. */
2643 "movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
2644 "popl %ebp\n\t"
2645 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2646 __ASM_CFI(".cfi_same_value %ebp\n\t")
2647 "ret $20" ) /* (*4) */
2648
2649 #endif /* __i386__ */
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