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[wine/hacks.git] / dlls / ntdll / signal_i386.c
blob49988207f4d6d1f80b253dcd8b92bf4ce08f1667
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 #ifdef 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 #endif /* linux */
182
183 #ifdef BSDI
184
185 #include <machine/frame.h>
186 typedef struct trapframe SIGCONTEXT;
187
188 #define EAX_sig(context) ((context)->tf_eax)
189 #define EBX_sig(context) ((context)->tf_ebx)
190 #define ECX_sig(context) ((context)->tf_ecx)
191 #define EDX_sig(context) ((context)->tf_edx)
192 #define ESI_sig(context) ((context)->tf_esi)
193 #define EDI_sig(context) ((context)->tf_edi)
194 #define EBP_sig(context) ((context)->tf_ebp)
195
196 #define CS_sig(context) ((context)->tf_cs)
197 #define DS_sig(context) ((context)->tf_ds)
198 #define ES_sig(context) ((context)->tf_es)
199 #define SS_sig(context) ((context)->tf_ss)
200
201 #define EFL_sig(context) ((context)->tf_eflags)
202
203 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
204 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
205
206 #define FPU_sig(context) NULL /* FIXME */
207 #define FPUX_sig(context) NULL /* FIXME */
208
209 #endif /* bsdi */
210
211 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
212
213 typedef struct sigcontext SIGCONTEXT;
214
215 #define EAX_sig(context) ((context)->sc_eax)
216 #define EBX_sig(context) ((context)->sc_ebx)
217 #define ECX_sig(context) ((context)->sc_ecx)
218 #define EDX_sig(context) ((context)->sc_edx)
219 #define ESI_sig(context) ((context)->sc_esi)
220 #define EDI_sig(context) ((context)->sc_edi)
221 #define EBP_sig(context) ((context)->sc_ebp)
222
223 #define CS_sig(context) ((context)->sc_cs)
224 #define DS_sig(context) ((context)->sc_ds)
225 #define ES_sig(context) ((context)->sc_es)
226 #define FS_sig(context) ((context)->sc_fs)
227 #define GS_sig(context) ((context)->sc_gs)
228 #define SS_sig(context) ((context)->sc_ss)
229
230 #define TRAP_sig(context) ((context)->sc_trapno)
231 #define ERROR_sig(context) ((context)->sc_err)
232 #define EFL_sig(context) ((context)->sc_eflags)
233
234 #define EIP_sig(context) ((context)->sc_eip)
235 #define ESP_sig(context) ((context)->sc_esp)
236
237 #define FPU_sig(context) NULL /* FIXME */
238 #define FPUX_sig(context) NULL /* FIXME */
239
240 #endif /* __FreeBSD__ */
241
242 #ifdef __OpenBSD__
243
244 typedef struct sigcontext SIGCONTEXT;
245
246 #define EAX_sig(context) ((context)->sc_eax)
247 #define EBX_sig(context) ((context)->sc_ebx)
248 #define ECX_sig(context) ((context)->sc_ecx)
249 #define EDX_sig(context) ((context)->sc_edx)
250 #define ESI_sig(context) ((context)->sc_esi)
251 #define EDI_sig(context) ((context)->sc_edi)
252 #define EBP_sig(context) ((context)->sc_ebp)
253
254 #define CS_sig(context) ((context)->sc_cs)
255 #define DS_sig(context) ((context)->sc_ds)
256 #define ES_sig(context) ((context)->sc_es)
257 #define FS_sig(context) ((context)->sc_fs)
258 #define GS_sig(context) ((context)->sc_gs)
259 #define SS_sig(context) ((context)->sc_ss)
260
261 #define TRAP_sig(context) ((context)->sc_trapno)
262 #define ERROR_sig(context) ((context)->sc_err)
263 #define EFL_sig(context) ((context)->sc_eflags)
264
265 #define EIP_sig(context) ((context)->sc_eip)
266 #define ESP_sig(context) ((context)->sc_esp)
267
268 #define FPU_sig(context) NULL /* FIXME */
269 #define FPUX_sig(context) NULL /* FIXME */
270
271 #define T_MCHK T_MACHK
272 #define T_XMMFLT T_XFTRAP
273
274 #endif /* __OpenBSD__ */
275
276 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
277
278 #ifdef _SCO_DS
279 #include <sys/regset.h>
280 #endif
281 #include <sys/ucontext.h>
282 typedef struct ucontext SIGCONTEXT;
283
284 #ifdef _SCO_DS
285 #define gregs regs
286 #endif
287
288 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
289 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
290 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
291 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
292 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
293 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
294 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
295
296 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
297 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
298 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
299 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
300
301 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
302 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
303
304 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
305
306 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
307 #ifdef UESP
308 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
309 #elif defined(R_ESP)
310 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
311 #else
312 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
313 #endif
314 #ifdef ERR
315 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
316 #endif
317 #ifdef TRAPNO
318 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
319 #endif
320
321 #define FPU_sig(context) NULL /* FIXME */
322 #define FPUX_sig(context) NULL /* FIXME */
323
324 #endif /* svr4 || SCO_DS */
325
326 #ifdef __APPLE__
327 # include <sys/ucontext.h>
328
329 typedef ucontext_t SIGCONTEXT;
330
331 /* work around silly renaming of struct members in OS X 10.5 */
332 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
333 #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
334 #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
335 #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
336 #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
337 #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
338 #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
339 #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
340 #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
341 #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
342 #define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
343 #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
344 #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
345 #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
346 #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
347 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
348 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
349 #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
350 #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
351 #define FPU_sig(context) NULL
352 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
353 #else
354 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
355 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
356 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
357 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
358 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
359 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
360 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
361 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
362 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
363 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
364 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
365 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
366 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
367 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
368 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
369 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
370 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
371 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
372 #define FPU_sig(context) NULL
373 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
374 #endif
375
376 #endif /* __APPLE__ */
377
378 #if defined(__NetBSD__)
379 # include <sys/ucontext.h>
380 # include <sys/types.h>
381 # include <signal.h>
382
383 typedef ucontext_t SIGCONTEXT;
384
385 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
386 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
387 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
388 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
389 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
390 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
391 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
392 #define ESP_sig(context) _UC_MACHINE_SP(context)
393
394 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
395 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
396 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
397 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
398 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
399 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
400
401 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
402 #define EIP_sig(context) _UC_MACHINE_PC(context)
403 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
404 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
405
406 #define FPU_sig(context) NULL
407 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
408
409 #define T_MCHK T_MCA
410 #define T_XMMFLT T_XMM
411
412 #endif /* __NetBSD__ */
413
414 WINE_DEFAULT_DEBUG_CHANNEL(seh);
415
416 typedef int (*wine_signal_handler)(unsigned int sig);
417
418 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
419 static size_t signal_stack_mask;
420 static size_t signal_stack_size;
421
422 static wine_signal_handler handlers[256];
423
424 static int fpux_support; /* whether the CPU support extended fpu context */
425
426 extern void DECLSPEC_NORETURN __wine_restore_regs( const CONTEXT *context );
427
428 enum i386_trap_code
429 {
430 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
431 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
432 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
433 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
434 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
435 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
436 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
437 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
438 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
439 TRAP_x86_DNA = T_DNA, /* Device not available exception */
440 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
441 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
442 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
443 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
444 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
445 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
446 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
447 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
448 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
449 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
450 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
451 #else
452 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
453 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
454 TRAP_x86_NMI = 2, /* NMI interrupt */
455 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
456 TRAP_x86_OFLOW = 4, /* Overflow exception */
457 TRAP_x86_BOUND = 5, /* Bound range exception */
458 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
459 TRAP_x86_DNA = 7, /* Device not available exception */
460 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
461 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
462 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
463 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
464 TRAP_x86_STKFLT = 12, /* Stack fault */
465 TRAP_x86_PROTFLT = 13, /* General protection fault */
466 TRAP_x86_PAGEFLT = 14, /* Page fault */
467 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
468 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
469 TRAP_x86_MCHK = 18, /* Machine check exception */
470 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
471 otherwise Cache flush exception (via SIGSEV) */
472 #endif
473 };
474
475 /* Exception record for handling exceptions happening inside exception handlers */
476 typedef struct
477 {
478 EXCEPTION_REGISTRATION_RECORD frame;
479 EXCEPTION_REGISTRATION_RECORD *prevFrame;
480 } EXC_NESTED_FRAME;
481
482 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
483 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
484 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
485
486 /***********************************************************************
487 * dispatch_signal
488 */
489 static inline int dispatch_signal(unsigned int sig)
490 {
491 if (handlers[sig] == NULL) return 0;
492 return handlers[sig](sig);
493 }
494
495
496 /***********************************************************************
497 * get_trap_code
498 *
499 * Get the trap code for a signal.
500 */
501 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
502 {
503 #ifdef TRAP_sig
504 return TRAP_sig(sigcontext);
505 #else
506 return TRAP_x86_UNKNOWN; /* unknown trap code */
507 #endif
508 }
509
510 /***********************************************************************
511 * get_error_code
512 *
513 * Get the error code for a signal.
514 */
515 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
516 {
517 #ifdef ERROR_sig
518 return ERROR_sig(sigcontext);
519 #else
520 return 0;
521 #endif
522 }
523
524 /***********************************************************************
525 * get_signal_stack
526 *
527 * Get the base of the signal stack for the current thread.
528 */
529 static inline void *get_signal_stack(void)
530 {
531 return (char *)NtCurrentTeb() + 4096;
532 }
533
534
535 /***********************************************************************
536 * get_current_teb
537 *
538 * Get the current teb based on the stack pointer.
539 */
540 static inline TEB *get_current_teb(void)
541 {
542 unsigned long esp;
543 __asm__("movl %%esp,%0" : "=g" (esp) );
544 return (TEB *)(esp & ~signal_stack_mask);
545 }
546
547
548 /*******************************************************************
549 * raise_handler
550 *
551 * Handler for exceptions happening inside a handler.
552 */
553 static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
554 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
555 {
556 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
557 return ExceptionContinueSearch;
558 /* We shouldn't get here so we store faulty frame in dispatcher */
559 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
560 return ExceptionNestedException;
561 }
562
563
564 /*******************************************************************
565 * unwind_handler
566 *
567 * Handler for exceptions happening inside an unwind handler.
568 */
569 static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
570 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
571 {
572 if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
573 return ExceptionContinueSearch;
574 /* We shouldn't get here so we store faulty frame in dispatcher */
575 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
576 return ExceptionCollidedUnwind;
577 }
578
579
580 /**********************************************************************
581 * call_stack_handlers
582 *
583 * Call the stack handlers chain.
584 */
585 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
586 {
587 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
588 DWORD res;
589
590 frame = NtCurrentTeb()->Tib.ExceptionList;
591 nested_frame = NULL;
592 while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
593 {
594 /* Check frame address */
595 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
596 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
597 (ULONG_PTR)frame & 3)
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
877 /***********************************************************************
878 * init_handler
879 *
880 * Handler initialization when the full context is not needed.
881 * Return the stack pointer to use for pushing the exception data.
882 */
883 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
884 {
885 TEB *teb = get_current_teb();
886
887 /* get %fs and %gs at time of the fault */
888 #ifdef FS_sig
889 *fs = LOWORD(FS_sig(sigcontext));
890 #else
891 *fs = wine_get_fs();
892 #endif
893 #ifdef GS_sig
894 *gs = LOWORD(GS_sig(sigcontext));
895 #else
896 *gs = wine_get_gs();
897 #endif
898
899 #ifndef __sun /* see above for Solaris handling */
900 {
901 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
902 wine_set_fs( thread_data->fs );
903 wine_set_gs( thread_data->gs );
904 }
905 #endif
906
907 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
908 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
909 {
910 /*
911 * Win16 or DOS protected mode. Note that during switch
912 * from 16-bit mode to linear mode, CS may be set to system
913 * segment before FS is restored. Fortunately, in this case
914 * SS is still non-system segment. This is why both CS and SS
915 * are checked.
916 */
917 return teb->WOW32Reserved;
918 }
919 return (void *)(ESP_sig(sigcontext) & ~3);
920 }
921
922
923 /***********************************************************************
924 * save_fpu
925 *
926 * Save the thread FPU context.
927 */
928 static inline void save_fpu( CONTEXT *context )
929 {
930 #ifdef __GNUC__
931 context->ContextFlags |= CONTEXT_FLOATING_POINT;
932 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
933 #endif
934 }
935
936
937 /***********************************************************************
938 * save_fpux
939 *
940 * Save the thread FPU extended context.
941 */
942 static inline void save_fpux( CONTEXT *context )
943 {
944 #ifdef __GNUC__
945 /* we have to enforce alignment by hand */
946 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
947 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
948
949 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
950 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
951 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
952 #endif
953 }
954
955
956 /***********************************************************************
957 * restore_fpu
958 *
959 * Restore the FPU context to a sigcontext.
960 */
961 static inline void restore_fpu( const CONTEXT *context )
962 {
963 FLOATING_SAVE_AREA float_status = context->FloatSave;
964 /* reset the current interrupt status */
965 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
966 #ifdef __GNUC__
967 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
968 #endif /* __GNUC__ */
969 }
970
971
972 /***********************************************************************
973 * restore_fpux
974 *
975 * Restore the FPU extended context to a sigcontext.
976 */
977 static inline void restore_fpux( const CONTEXT *context )
978 {
979 #ifdef __GNUC__
980 /* we have to enforce alignment by hand */
981 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
982 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
983
984 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
985 /* reset the current interrupt status */
986 state->StatusWord &= state->ControlWord | 0xff80;
987 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
988 #endif
989 }
990
991
992 /***********************************************************************
993 * fpux_to_fpu
994 *
995 * Build a standard FPU context from an extended one.
996 */
997 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
998 {
999 unsigned int i, tag, stack_top;
1000
1001 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
1002 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
1003 fpu->ErrorOffset = fpux->ErrorOffset;
1004 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
1005 fpu->DataOffset = fpux->DataOffset;
1006 fpu->DataSelector = fpux->DataSelector;
1007 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
1008
1009 stack_top = (fpux->StatusWord >> 11) & 7;
1010 fpu->TagWord = 0xffff0000;
1011 for (i = 0; i < 8; i++)
1012 {
1013 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
1014 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
1015 else
1016 {
1017 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
1018 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
1019 {
1020 tag = 2; /* special */
1021 }
1022 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
1023 {
1024 if (reg->Low) tag = 2; /* special */
1025 else tag = 1; /* zero */
1026 }
1027 else
1028 {
1029 if (reg->Low >> 63) tag = 0; /* valid */
1030 else tag = 2; /* special */
1031 }
1032 }
1033 fpu->TagWord |= tag << (2 * i);
1034 }
1035 }
1036
1037
1038 /***********************************************************************
1039 * save_context
1040 *
1041 * Build a context structure from the signal info.
1042 */
1043 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
1044 {
1045 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1046 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1047 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1048
1049 memset(context, 0, sizeof(*context));
1050 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
1051 context->Eax = EAX_sig(sigcontext);
1052 context->Ebx = EBX_sig(sigcontext);
1053 context->Ecx = ECX_sig(sigcontext);
1054 context->Edx = EDX_sig(sigcontext);
1055 context->Esi = ESI_sig(sigcontext);
1056 context->Edi = EDI_sig(sigcontext);
1057 context->Ebp = EBP_sig(sigcontext);
1058 context->EFlags = EFL_sig(sigcontext);
1059 context->Eip = EIP_sig(sigcontext);
1060 context->Esp = ESP_sig(sigcontext);
1061 context->SegCs = LOWORD(CS_sig(sigcontext));
1062 context->SegDs = LOWORD(DS_sig(sigcontext));
1063 context->SegEs = LOWORD(ES_sig(sigcontext));
1064 context->SegFs = fs;
1065 context->SegGs = gs;
1066 context->SegSs = LOWORD(SS_sig(sigcontext));
1067 context->Dr0 = regs->dr0;
1068 context->Dr1 = regs->dr1;
1069 context->Dr2 = regs->dr2;
1070 context->Dr3 = regs->dr3;
1071 context->Dr6 = regs->dr6;
1072 context->Dr7 = regs->dr7;
1073
1074 if (fpu)
1075 {
1076 context->ContextFlags |= CONTEXT_FLOATING_POINT;
1077 context->FloatSave = *fpu;
1078 }
1079 if (fpux)
1080 {
1081 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
1082 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
1083 fpux_support = 1;
1084 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
1085 }
1086 if (!fpu && !fpux) save_fpu( context );
1087 }
1088
1089
1090 /***********************************************************************
1091 * restore_context
1092 *
1093 * Restore the signal info from the context.
1094 */
1095 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
1096 {
1097 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1098 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1099 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1100
1101 regs->dr0 = context->Dr0;
1102 regs->dr1 = context->Dr1;
1103 regs->dr2 = context->Dr2;
1104 regs->dr3 = context->Dr3;
1105 regs->dr6 = context->Dr6;
1106 regs->dr7 = context->Dr7;
1107 EAX_sig(sigcontext) = context->Eax;
1108 EBX_sig(sigcontext) = context->Ebx;
1109 ECX_sig(sigcontext) = context->Ecx;
1110 EDX_sig(sigcontext) = context->Edx;
1111 ESI_sig(sigcontext) = context->Esi;
1112 EDI_sig(sigcontext) = context->Edi;
1113 EBP_sig(sigcontext) = context->Ebp;
1114 EFL_sig(sigcontext) = context->EFlags;
1115 EIP_sig(sigcontext) = context->Eip;
1116 ESP_sig(sigcontext) = context->Esp;
1117 CS_sig(sigcontext) = context->SegCs;
1118 DS_sig(sigcontext) = context->SegDs;
1119 ES_sig(sigcontext) = context->SegEs;
1120 SS_sig(sigcontext) = context->SegSs;
1121 #ifdef GS_sig
1122 GS_sig(sigcontext) = context->SegGs;
1123 #else
1124 wine_set_gs( context->SegGs );
1125 #endif
1126 #ifdef FS_sig
1127 FS_sig(sigcontext) = context->SegFs;
1128 #else
1129 wine_set_fs( context->SegFs );
1130 #endif
1131
1132 if (fpu) *fpu = context->FloatSave;
1133 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
1134 if (!fpu && !fpux) restore_fpu( context );
1135 }
1136
1137
1138 /***********************************************************************
1139 * RtlCaptureContext (NTDLL.@)
1140 */
1141 void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
1142 {
1143 *context = *regs;
1144 if (fpux_support) save_fpux( context );
1145 else save_fpu( context );
1146 }
1147 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
1148
1149
1150 /***********************************************************************
1151 * set_cpu_context
1152 *
1153 * Set the new CPU context. Used by NtSetContextThread.
1154 */
1155 void set_cpu_context( const CONTEXT *context )
1156 {
1157 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1158
1159 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
1160 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
1161
1162 if (flags & CONTEXT_DEBUG_REGISTERS)
1163 {
1164 ntdll_get_thread_data()->dr0 = context->Dr0;
1165 ntdll_get_thread_data()->dr1 = context->Dr1;
1166 ntdll_get_thread_data()->dr2 = context->Dr2;
1167 ntdll_get_thread_data()->dr3 = context->Dr3;
1168 ntdll_get_thread_data()->dr6 = context->Dr6;
1169 ntdll_get_thread_data()->dr7 = context->Dr7;
1170 }
1171 if (flags & CONTEXT_FULL)
1172 {
1173 if (!(flags & CONTEXT_CONTROL))
1174 FIXME( "setting partial context (%x) not supported\n", flags );
1175 else if (flags & CONTEXT_SEGMENTS)
1176 __wine_restore_regs( context );
1177 else
1178 {
1179 CONTEXT newcontext = *context;
1180 newcontext.SegDs = wine_get_ds();
1181 newcontext.SegEs = wine_get_es();
1182 newcontext.SegFs = wine_get_fs();
1183 newcontext.SegGs = wine_get_gs();
1184 __wine_restore_regs( &newcontext );
1185 }
1186 }
1187 }
1188
1189
1190 /***********************************************************************
1191 * set_debug_registers
1192 */
1193 static void set_debug_registers( const CONTEXT *context )
1194 {
1195 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1196 context_t server_context;
1197
1198 if (!(flags & CONTEXT_DEBUG_REGISTERS)) return;
1199 if (ntdll_get_thread_data()->dr0 == context->Dr0 &&
1200 ntdll_get_thread_data()->dr1 == context->Dr1 &&
1201 ntdll_get_thread_data()->dr2 == context->Dr2 &&
1202 ntdll_get_thread_data()->dr3 == context->Dr3 &&
1203 ntdll_get_thread_data()->dr6 == context->Dr6 &&
1204 ntdll_get_thread_data()->dr7 == context->Dr7) return;
1205
1206 context_to_server( &server_context, context );
1207
1208 SERVER_START_REQ( set_thread_context )
1209 {
1210 req->handle = wine_server_obj_handle( GetCurrentThread() );
1211 req->suspend = 0;
1212 wine_server_add_data( req, &server_context, sizeof(server_context) );
1213 wine_server_call( req );
1214 }
1215 SERVER_END_REQ;
1216 }
1217
1218
1219 /***********************************************************************
1220 * copy_context
1221 *
1222 * Copy a register context according to the flags.
1223 */
1224 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
1225 {
1226 flags &= ~CONTEXT_i386; /* get rid of CPU id */
1227 if (flags & CONTEXT_INTEGER)
1228 {
1229 to->Eax = from->Eax;
1230 to->Ebx = from->Ebx;
1231 to->Ecx = from->Ecx;
1232 to->Edx = from->Edx;
1233 to->Esi = from->Esi;
1234 to->Edi = from->Edi;
1235 }
1236 if (flags & CONTEXT_CONTROL)
1237 {
1238 to->Ebp = from->Ebp;
1239 to->Esp = from->Esp;
1240 to->Eip = from->Eip;
1241 to->SegCs = from->SegCs;
1242 to->SegSs = from->SegSs;
1243 to->EFlags = from->EFlags;
1244 }
1245 if (flags & CONTEXT_SEGMENTS)
1246 {
1247 to->SegDs = from->SegDs;
1248 to->SegEs = from->SegEs;
1249 to->SegFs = from->SegFs;
1250 to->SegGs = from->SegGs;
1251 }
1252 if (flags & CONTEXT_DEBUG_REGISTERS)
1253 {
1254 to->Dr0 = from->Dr0;
1255 to->Dr1 = from->Dr1;
1256 to->Dr2 = from->Dr2;
1257 to->Dr3 = from->Dr3;
1258 to->Dr6 = from->Dr6;
1259 to->Dr7 = from->Dr7;
1260 }
1261 if (flags & CONTEXT_FLOATING_POINT)
1262 {
1263 to->FloatSave = from->FloatSave;
1264 }
1265 if (flags & CONTEXT_EXTENDED_REGISTERS)
1266 {
1267 memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
1268 }
1269 }
1270
1271
1272 /***********************************************************************
1273 * context_to_server
1274 *
1275 * Convert a register context to the server format.
1276 */
1277 NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
1278 {
1279 DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
1280
1281 memset( to, 0, sizeof(*to) );
1282 to->cpu = CPU_x86;
1283
1284 if (flags & CONTEXT_CONTROL)
1285 {
1286 to->flags |= SERVER_CTX_CONTROL;
1287 to->ctl.i386_regs.ebp = from->Ebp;
1288 to->ctl.i386_regs.esp = from->Esp;
1289 to->ctl.i386_regs.eip = from->Eip;
1290 to->ctl.i386_regs.cs = from->SegCs;
1291 to->ctl.i386_regs.ss = from->SegSs;
1292 to->ctl.i386_regs.eflags = from->EFlags;
1293 }
1294 if (flags & CONTEXT_INTEGER)
1295 {
1296 to->flags |= SERVER_CTX_INTEGER;
1297 to->integer.i386_regs.eax = from->Eax;
1298 to->integer.i386_regs.ebx = from->Ebx;
1299 to->integer.i386_regs.ecx = from->Ecx;
1300 to->integer.i386_regs.edx = from->Edx;
1301 to->integer.i386_regs.esi = from->Esi;
1302 to->integer.i386_regs.edi = from->Edi;
1303 }
1304 if (flags & CONTEXT_SEGMENTS)
1305 {
1306 to->flags |= SERVER_CTX_SEGMENTS;
1307 to->seg.i386_regs.ds = from->SegDs;
1308 to->seg.i386_regs.es = from->SegEs;
1309 to->seg.i386_regs.fs = from->SegFs;
1310 to->seg.i386_regs.gs = from->SegGs;
1311 }
1312 if (flags & CONTEXT_FLOATING_POINT)
1313 {
1314 to->flags |= SERVER_CTX_FLOATING_POINT;
1315 to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
1316 to->fp.i386_regs.status = from->FloatSave.StatusWord;
1317 to->fp.i386_regs.tag = from->FloatSave.TagWord;
1318 to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
1319 to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
1320 to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
1321 to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
1322 to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
1323 memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
1324 }
1325 if (flags & CONTEXT_DEBUG_REGISTERS)
1326 {
1327 to->flags |= SERVER_CTX_DEBUG_REGISTERS;
1328 to->debug.i386_regs.dr0 = from->Dr0;
1329 to->debug.i386_regs.dr1 = from->Dr1;
1330 to->debug.i386_regs.dr2 = from->Dr2;
1331 to->debug.i386_regs.dr3 = from->Dr3;
1332 to->debug.i386_regs.dr6 = from->Dr6;
1333 to->debug.i386_regs.dr7 = from->Dr7;
1334 }
1335 if (flags & CONTEXT_EXTENDED_REGISTERS)
1336 {
1337 to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
1338 memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
1339 }
1340 return STATUS_SUCCESS;
1341 }
1342
1343
1344 /***********************************************************************
1345 * context_from_server
1346 *
1347 * Convert a register context from the server format.
1348 */
1349 NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
1350 {
1351 if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
1352
1353 to->ContextFlags = CONTEXT_i386;
1354 if (from->flags & SERVER_CTX_CONTROL)
1355 {
1356 to->ContextFlags |= CONTEXT_CONTROL;
1357 to->Ebp = from->ctl.i386_regs.ebp;
1358 to->Esp = from->ctl.i386_regs.esp;
1359 to->Eip = from->ctl.i386_regs.eip;
1360 to->SegCs = from->ctl.i386_regs.cs;
1361 to->SegSs = from->ctl.i386_regs.ss;
1362 to->EFlags = from->ctl.i386_regs.eflags;
1363 }
1364 if (from->flags & SERVER_CTX_INTEGER)
1365 {
1366 to->ContextFlags |= CONTEXT_INTEGER;
1367 to->Eax = from->integer.i386_regs.eax;
1368 to->Ebx = from->integer.i386_regs.ebx;
1369 to->Ecx = from->integer.i386_regs.ecx;
1370 to->Edx = from->integer.i386_regs.edx;
1371 to->Esi = from->integer.i386_regs.esi;
1372 to->Edi = from->integer.i386_regs.edi;
1373 }
1374 if (from->flags & SERVER_CTX_SEGMENTS)
1375 {
1376 to->ContextFlags |= CONTEXT_SEGMENTS;
1377 to->SegDs = from->seg.i386_regs.ds;
1378 to->SegEs = from->seg.i386_regs.es;
1379 to->SegFs = from->seg.i386_regs.fs;
1380 to->SegGs = from->seg.i386_regs.gs;
1381 }
1382 if (from->flags & SERVER_CTX_FLOATING_POINT)
1383 {
1384 to->ContextFlags |= CONTEXT_FLOATING_POINT;
1385 to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
1386 to->FloatSave.StatusWord = from->fp.i386_regs.status;
1387 to->FloatSave.TagWord = from->fp.i386_regs.tag;
1388 to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
1389 to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
1390 to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
1391 to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
1392 to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
1393 memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
1394 }
1395 if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
1396 {
1397 to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
1398 to->Dr0 = from->debug.i386_regs.dr0;
1399 to->Dr1 = from->debug.i386_regs.dr1;
1400 to->Dr2 = from->debug.i386_regs.dr2;
1401 to->Dr3 = from->debug.i386_regs.dr3;
1402 to->Dr6 = from->debug.i386_regs.dr6;
1403 to->Dr7 = from->debug.i386_regs.dr7;
1404 }
1405 if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
1406 {
1407 to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
1408 memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
1409 }
1410 return STATUS_SUCCESS;
1411 }
1412
1413
1414 /***********************************************************************
1415 * is_privileged_instr
1416 *
1417 * Check if the fault location is a privileged instruction.
1418 * Based on the instruction emulation code in dlls/kernel/instr.c.
1419 */
1420 static inline DWORD is_privileged_instr( CONTEXT86 *context )
1421 {
1422 const BYTE *instr;
1423 unsigned int prefix_count = 0;
1424
1425 if (!wine_ldt_is_system( context->SegCs )) return 0;
1426 instr = (BYTE *)context->Eip;
1427
1428 for (;;) switch(*instr)
1429 {
1430 /* instruction prefixes */
1431 case 0x2e: /* %cs: */
1432 case 0x36: /* %ss: */
1433 case 0x3e: /* %ds: */
1434 case 0x26: /* %es: */
1435 case 0x64: /* %fs: */
1436 case 0x65: /* %gs: */
1437 case 0x66: /* opcode size */
1438 case 0x67: /* addr size */
1439 case 0xf0: /* lock */
1440 case 0xf2: /* repne */
1441 case 0xf3: /* repe */
1442 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1443 instr++;
1444 continue;
1445
1446 case 0x0f: /* extended instruction */
1447 switch(instr[1])
1448 {
1449 case 0x20: /* mov crX, reg */
1450 case 0x21: /* mov drX, reg */
1451 case 0x22: /* mov reg, crX */
1452 case 0x23: /* mov reg drX */
1453 return EXCEPTION_PRIV_INSTRUCTION;
1454 }
1455 return 0;
1456 case 0x6c: /* insb (%dx) */
1457 case 0x6d: /* insl (%dx) */
1458 case 0x6e: /* outsb (%dx) */
1459 case 0x6f: /* outsl (%dx) */
1460 case 0xcd: /* int $xx */
1461 case 0xe4: /* inb al,XX */
1462 case 0xe5: /* in (e)ax,XX */
1463 case 0xe6: /* outb XX,al */
1464 case 0xe7: /* out XX,(e)ax */
1465 case 0xec: /* inb (%dx),%al */
1466 case 0xed: /* inl (%dx),%eax */
1467 case 0xee: /* outb %al,(%dx) */
1468 case 0xef: /* outl %eax,(%dx) */
1469 case 0xf4: /* hlt */
1470 case 0xfa: /* cli */
1471 case 0xfb: /* sti */
1472 return EXCEPTION_PRIV_INSTRUCTION;
1473 default:
1474 return 0;
1475 }
1476 }
1477
1478
1479 #include "pshpack1.h"
1480 struct atl_thunk
1481 {
1482 DWORD movl; /* movl this,4(%esp) */
1483 DWORD this;
1484 BYTE jmp; /* jmp func */
1485 int func;
1486 };
1487 #include "poppack.h"
1488
1489 /**********************************************************************
1490 * check_atl_thunk
1491 *
1492 * Check if code destination is an ATL thunk, and emulate it if so.
1493 */
1494 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1495 {
1496 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1497 BOOL ret = FALSE;
1498
1499 __TRY
1500 {
1501 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1502 {
1503 *((DWORD *)context->Esp + 1) = thunk->this;
1504 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1505 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1506 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1507 ret = TRUE;
1508 }
1509 }
1510 __EXCEPT_PAGE_FAULT
1511 {
1512 return FALSE;
1513 }
1514 __ENDTRY
1515 return ret;
1516 }
1517
1518
1519 /***********************************************************************
1520 * setup_exception_record
1521 *
1522 * Setup the exception record and context on the thread stack.
1523 */
1524 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1525 WORD fs, WORD gs, raise_func func )
1526 {
1527 struct stack_layout
1528 {
1529 void *ret_addr; /* return address from raise_func */
1530 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1531 CONTEXT *context_ptr; /* second arg for raise_func */
1532 CONTEXT context;
1533 EXCEPTION_RECORD rec;
1534 DWORD ebp;
1535 DWORD eip;
1536 } *stack = stack_ptr;
1537 DWORD exception_code = 0;
1538
1539 /* stack sanity checks */
1540
1541 if ((char *)stack >= (char *)get_signal_stack() &&
1542 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1543 {
1544 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1545 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1546 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1547 NtCurrentTeb()->Tib.StackBase );
1548 abort_thread(1);
1549 }
1550
1551 if (stack - 1 > stack || /* check for overflow in subtraction */
1552 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1553 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1554 {
1555 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1556 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1557 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1558 NtCurrentTeb()->Tib.StackBase );
1559 }
1560 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1561 {
1562 /* stack overflow on last page, unrecoverable */
1563 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1564 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1565 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1566 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1567 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1568 abort_thread(1);
1569 }
1570 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1571 {
1572 /* stack access below stack limit, may be recoverable */
1573 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1574 else
1575 {
1576 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1577 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1578 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1579 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1580 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1581 abort_thread(1);
1582 }
1583 }
1584
1585 stack--; /* push the stack_layout structure */
1586 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1587 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1588 #elif defined(VALGRIND_MAKE_WRITABLE)
1589 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1590 #endif
1591 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1592 stack->rec_ptr = &stack->rec;
1593 stack->context_ptr = &stack->context;
1594
1595 stack->rec.ExceptionRecord = NULL;
1596 stack->rec.ExceptionCode = exception_code;
1597 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1598 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1599 stack->rec.NumberParameters = 0;
1600
1601 save_context( &stack->context, sigcontext, fs, gs );
1602
1603 /* now modify the sigcontext to return to the raise function */
1604 ESP_sig(sigcontext) = (DWORD)stack;
1605 EIP_sig(sigcontext) = (DWORD)func;
1606 /* clear single-step, direction, and align check flag */
1607 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1608 CS_sig(sigcontext) = wine_get_cs();
1609 DS_sig(sigcontext) = wine_get_ds();
1610 ES_sig(sigcontext) = wine_get_es();
1611 FS_sig(sigcontext) = wine_get_fs();
1612 GS_sig(sigcontext) = wine_get_gs();
1613 SS_sig(sigcontext) = wine_get_ss();
1614
1615 return stack->rec_ptr;
1616 }
1617
1618
1619 /***********************************************************************
1620 * setup_exception
1621 *
1622 * Setup a proper stack frame for the raise function, and modify the
1623 * sigcontext so that the return from the signal handler will call
1624 * the raise function.
1625 */
1626 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1627 {
1628 WORD fs, gs;
1629 void *stack = init_handler( sigcontext, &fs, &gs );
1630
1631 return setup_exception_record( sigcontext, stack, fs, gs, func );
1632 }
1633
1634
1635 /***********************************************************************
1636 * get_exception_context
1637 *
1638 * Get a pointer to the context built by setup_exception.
1639 */
1640 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1641 {
1642 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1643 }
1644
1645
1646 /**********************************************************************
1647 * get_fpu_code
1648 *
1649 * Get the FPU exception code from the FPU status.
1650 */
1651 static inline DWORD get_fpu_code( const CONTEXT *context )
1652 {
1653 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1654
1655 if (status & 0x01) /* IE */
1656 {
1657 if (status & 0x40) /* SF */
1658 return EXCEPTION_FLT_STACK_CHECK;
1659 else
1660 return EXCEPTION_FLT_INVALID_OPERATION;
1661 }
1662 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1663 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1664 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1665 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1666 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1667 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1668 }
1669
1670
1671 /**********************************************************************
1672 * raise_segv_exception
1673 */
1674 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1675 {
1676 NTSTATUS status;
1677
1678 switch(rec->ExceptionCode)
1679 {
1680 case EXCEPTION_ACCESS_VIOLATION:
1681 if (rec->NumberParameters == 2)
1682 {
1683 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1684 goto done;
1685 if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1686 rec->ExceptionInformation[0] )))
1687 goto done;
1688 /* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
1689 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
1690 {
1691 ULONG flags;
1692 NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
1693 &flags, sizeof(flags), NULL );
1694 if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
1695 rec->ExceptionInformation[0] = EXCEPTION_READ_FAULT;
1696 }
1697 }
1698 break;
1699 case EXCEPTION_DATATYPE_MISALIGNMENT:
1700 /* FIXME: pass through exception handler first? */
1701 if (context->EFlags & 0x00040000)
1702 {
1703 /* Disable AC flag, return */
1704 context->EFlags &= ~0x00040000;
1705 goto done;
1706 }
1707 break;
1708 }
1709 status = NtRaiseException( rec, context, TRUE );
1710 raise_status( status, rec );
1711 done:
1712 set_cpu_context( context );
1713 }
1714
1715
1716 /**********************************************************************
1717 * raise_trap_exception
1718 */
1719 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1720 {
1721 NTSTATUS status;
1722
1723 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1724 {
1725 /* when single stepping can't tell whether this is a hw bp or a
1726 * single step interrupt. try to avoid as much overhead as possible
1727 * and only do a server call if there is any hw bp enabled. */
1728
1729 if( !(context->EFlags & 0x100) || (ntdll_get_thread_data()->dr7 & 0xff) )
1730 {
1731 /* (possible) hardware breakpoint, fetch the debug registers */
1732 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1733 NtGetContextThread(GetCurrentThread(), context);
1734 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1735 }
1736
1737 context->EFlags &= ~0x100; /* clear single-step flag */
1738 }
1739
1740 status = NtRaiseException( rec, context, TRUE );
1741 raise_status( status, rec );
1742 }
1743
1744
1745 /**********************************************************************
1746 * raise_generic_exception
1747 *
1748 * Generic raise function for exceptions that don't need special treatment.
1749 */
1750 static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1751 {
1752 NTSTATUS status;
1753
1754 status = NtRaiseException( rec, context, TRUE );
1755 raise_status( status, rec );
1756 }
1757
1758
1759 #ifdef __HAVE_VM86
1760 /**********************************************************************
1761 * raise_vm86_sti_exception
1762 */
1763 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1764 {
1765 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1766 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1767
1768 if (ntdll_get_thread_data()->vm86_ptr)
1769 {
1770 if (((char*)context->Eip >= (char*)vm86_return) &&
1771 ((char*)context->Eip <= (char*)vm86_return_end) &&
1772 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1773 /* exiting from VM86, can't throw */
1774 goto done;
1775 }
1776 merge_vm86_pending_flags( rec );
1777 }
1778 else if (get_vm86_teb_info()->dpmi_vif &&
1779 !wine_ldt_is_system(context->SegCs) &&
1780 !wine_ldt_is_system(context->SegSs))
1781 {
1782 /* Executing DPMI code and virtual interrupts are enabled. */
1783 get_vm86_teb_info()->vm86_pending = 0;
1784 NtRaiseException( rec, context, TRUE );
1785 }
1786 done:
1787 set_cpu_context( context );
1788 }
1789
1790
1791 /**********************************************************************
1792 * usr2_handler
1793 *
1794 * Handler for SIGUSR2.
1795 * We use it to signal that the running __wine_enter_vm86() should
1796 * immediately set VIP_FLAG, causing pending events to be handled
1797 * as early as possible.
1798 */
1799 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1800 {
1801 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1802 rec->ExceptionCode = EXCEPTION_VM86_STI;
1803 }
1804 #endif /* __HAVE_VM86 */
1805
1806
1807 /**********************************************************************
1808 * segv_handler
1809 *
1810 * Handler for SIGSEGV and related errors.
1811 */
1812 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1813 {
1814 WORD fs, gs;
1815 EXCEPTION_RECORD *rec;
1816 SIGCONTEXT *context = sigcontext;
1817 void *stack = init_handler( sigcontext, &fs, &gs );
1818
1819 /* check for page fault inside the thread stack */
1820 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1821 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1822 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1823 virtual_handle_stack_fault( siginfo->si_addr ))
1824 {
1825 /* check if this was the last guard page */
1826 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1827 {
1828 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1829 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1830 }
1831 return;
1832 }
1833
1834 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1835 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1836
1837 switch(get_trap_code(context))
1838 {
1839 case TRAP_x86_OFLOW: /* Overflow exception */
1840 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1841 break;
1842 case TRAP_x86_BOUND: /* Bound range exception */
1843 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1844 break;
1845 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1846 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1847 break;
1848 case TRAP_x86_STKFLT: /* Stack fault */
1849 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1850 break;
1851 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1852 case TRAP_x86_PROTFLT: /* General protection fault */
1853 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1854 {
1855 WORD err = get_error_code(context);
1856 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1857 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1858 rec->NumberParameters = 2;
1859 rec->ExceptionInformation[0] = 0;
1860 /* if error contains a LDT selector, use that as fault address */
1861 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1862 rec->ExceptionInformation[1] = err & ~7;
1863 else
1864 rec->ExceptionInformation[1] = 0xffffffff;
1865 }
1866 break;
1867 case TRAP_x86_PAGEFLT: /* Page fault */
1868 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1869 rec->NumberParameters = 2;
1870 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1871 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1872 break;
1873 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1874 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1875 break;
1876 default:
1877 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1878 /* fall through */
1879 case TRAP_x86_NMI: /* NMI interrupt */
1880 case TRAP_x86_DNA: /* Device not available exception */
1881 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1882 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1883 case TRAP_x86_MCHK: /* Machine check exception */
1884 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1885 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1886 break;
1887 }
1888 }
1889
1890
1891 /**********************************************************************
1892 * trap_handler
1893 *
1894 * Handler for SIGTRAP.
1895 */
1896 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1897 {
1898 SIGCONTEXT *context = sigcontext;
1899 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1900
1901 switch(get_trap_code(context))
1902 {
1903 case TRAP_x86_TRCTRAP: /* Single-step exception */
1904 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1905 break;
1906 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1907 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1908 /* fall through */
1909 default:
1910 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1911 break;
1912 }
1913 }
1914
1915
1916 /**********************************************************************
1917 * fpe_handler
1918 *
1919 * Handler for SIGFPE.
1920 */
1921 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1922 {
1923 CONTEXT *win_context;
1924 SIGCONTEXT *context = sigcontext;
1925 EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );
1926
1927 win_context = get_exception_context( rec );
1928
1929 switch(get_trap_code(context))
1930 {
1931 case TRAP_x86_DIVIDE: /* Division by zero exception */
1932 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1933 break;
1934 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1935 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1936 break;
1937 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1938 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1939 rec->ExceptionCode = get_fpu_code( win_context );
1940 rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1941 break;
1942 case TRAP_x86_CACHEFLT: /* SIMD exception */
1943 /* TODO:
1944 * Behaviour only tested for divide-by-zero exceptions
1945 * Check for other SIMD exceptions as well */
1946 if(siginfo->si_code != FPE_FLTDIV)
1947 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1948 siginfo->si_code);
1949
1950 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1951 rec->NumberParameters = 1;
1952 /* no idea what meaning is actually behind this but that's what native does */
1953 rec->ExceptionInformation[0] = 0;
1954 break;
1955 default:
1956 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1957 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1958 break;
1959 }
1960 }
1961
1962
1963 /**********************************************************************
1964 * int_handler
1965 *
1966 * Handler for SIGINT.
1967 *
1968 * FIXME: should not be calling external functions on the signal stack.
1969 */
1970 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1971 {
1972 WORD fs, gs;
1973 init_handler( sigcontext, &fs, &gs );
1974 if (!dispatch_signal(SIGINT))
1975 {
1976 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
1977 rec->ExceptionCode = CONTROL_C_EXIT;
1978 }
1979 }
1980
1981 /**********************************************************************
1982 * abrt_handler
1983 *
1984 * Handler for SIGABRT.
1985 */
1986 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1987 {
1988 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
1989 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1990 rec->ExceptionFlags = EH_NONCONTINUABLE;
1991 }
1992
1993
1994 /**********************************************************************
1995 * quit_handler
1996 *
1997 * Handler for SIGQUIT.
1998 */
1999 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2000 {
2001 WORD fs, gs;
2002 init_handler( sigcontext, &fs, &gs );
2003 abort_thread(0);
2004 }
2005
2006
2007 /**********************************************************************
2008 * usr1_handler
2009 *
2010 * Handler for SIGUSR1, used to signal a thread that it got suspended.
2011 */
2012 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2013 {
2014 CONTEXT context;
2015 WORD fs, gs;
2016
2017 init_handler( sigcontext, &fs, &gs );
2018 save_context( &context, sigcontext, fs, gs );
2019 wait_suspend( &context );
2020 restore_context( &context, sigcontext );
2021 }
2022
2023
2024 /***********************************************************************
2025 * __wine_set_signal_handler (NTDLL.@)
2026 */
2027 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
2028 {
2029 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
2030 if (handlers[sig] != NULL) return -2;
2031 handlers[sig] = wsh;
2032 return 0;
2033 }
2034
2035
2036 /***********************************************************************
2037 * locking for LDT routines
2038 */
2039 static RTL_CRITICAL_SECTION ldt_section;
2040 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
2041 {
2042 0, 0, &ldt_section,
2043 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
2044 0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
2045 };
2046 static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
2047 static sigset_t ldt_sigset;
2048
2049 static void ldt_lock(void)
2050 {
2051 sigset_t sigset;
2052
2053 pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
2054 RtlEnterCriticalSection( &ldt_section );
2055 if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
2056 }
2057
2058 static void ldt_unlock(void)
2059 {
2060 if (ldt_section.RecursionCount == 1)
2061 {
2062 sigset_t sigset = ldt_sigset;
2063 RtlLeaveCriticalSection( &ldt_section );
2064 pthread_sigmask( SIG_SETMASK, &sigset, NULL );
2065 }
2066 else RtlLeaveCriticalSection( &ldt_section );
2067 }
2068
2069
2070 /**********************************************************************
2071 * signal_alloc_thread
2072 */
2073 NTSTATUS signal_alloc_thread( TEB **teb )
2074 {
2075 static size_t sigstack_zero_bits;
2076 struct ntdll_thread_data *thread_data;
2077 struct ntdll_thread_data *parent_data = NULL;
2078 SIZE_T size;
2079 void *addr = NULL;
2080 NTSTATUS status;
2081
2082 if (!sigstack_zero_bits)
2083 {
2084 size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
2085 /* find the first power of two not smaller than min_size */
2086 sigstack_zero_bits = 12;
2087 while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
2088 signal_stack_mask = (1 << sigstack_zero_bits) - 1;
2089 signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
2090 }
2091 else parent_data = ntdll_get_thread_data();
2092
2093 size = signal_stack_mask + 1;
2094 if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
2095 &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
2096 {
2097 *teb = addr;
2098 (*teb)->Tib.Self = &(*teb)->Tib;
2099 (*teb)->Tib.ExceptionList = (void *)~0UL;
2100 thread_data = (struct ntdll_thread_data *)(*teb)->SpareBytes1;
2101 if (!(thread_data->fs = wine_ldt_alloc_fs()))
2102 {
2103 size = 0;
2104 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
2105 status = STATUS_TOO_MANY_THREADS;
2106 }
2107 if (parent_data)
2108 {
2109 /* inherit debug registers from parent thread */
2110 thread_data->dr0 = parent_data->dr0;
2111 thread_data->dr1 = parent_data->dr1;
2112 thread_data->dr2 = parent_data->dr2;
2113 thread_data->dr3 = parent_data->dr3;
2114 thread_data->dr6 = parent_data->dr6;
2115 thread_data->dr7 = parent_data->dr7;
2116 }
2117
2118 }
2119 return status;
2120 }
2121
2122
2123 /**********************************************************************
2124 * signal_free_thread
2125 */
2126 void signal_free_thread( TEB *teb )
2127 {
2128 SIZE_T size;
2129 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2130
2131 if (thread_data) wine_ldt_free_fs( thread_data->fs );
2132 if (teb->DeallocationStack)
2133 {
2134 size = 0;
2135 NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
2136 }
2137 size = 0;
2138 NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
2139 }
2140
2141
2142 /**********************************************************************
2143 * signal_init_thread
2144 */
2145 void signal_init_thread( TEB *teb )
2146 {
2147 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2148 LDT_ENTRY fs_entry;
2149 stack_t ss;
2150
2151 #ifdef __APPLE__
2152 int mib[2], val = 1;
2153
2154 mib[0] = CTL_KERN;
2155 mib[1] = KERN_THALTSTACK;
2156 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
2157 #endif
2158
2159 ss.ss_sp = (char *)teb + teb_size;
2160 ss.ss_size = signal_stack_size;
2161 ss.ss_flags = 0;
2162 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
2163
2164 wine_ldt_set_base( &fs_entry, teb );
2165 wine_ldt_set_limit( &fs_entry, teb_size - 1 );
2166 wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
2167 wine_ldt_init_fs( thread_data->fs, &fs_entry );
2168 thread_data->gs = wine_get_gs();
2169 }
2170
2171 /**********************************************************************
2172 * signal_init_process
2173 */
2174 void signal_init_process(void)
2175 {
2176 struct sigaction sig_act;
2177
2178 sig_act.sa_mask = server_block_set;
2179 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
2180 #ifdef SA_ONSTACK
2181 sig_act.sa_flags |= SA_ONSTACK;
2182 #endif
2183
2184 sig_act.sa_sigaction = int_handler;
2185 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
2186 sig_act.sa_sigaction = fpe_handler;
2187 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
2188 sig_act.sa_sigaction = abrt_handler;
2189 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
2190 sig_act.sa_sigaction = quit_handler;
2191 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
2192 sig_act.sa_sigaction = usr1_handler;
2193 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
2194
2195 sig_act.sa_sigaction = segv_handler;
2196 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
2197 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
2198 #ifdef SIGBUS
2199 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
2200 #endif
2201
2202 #ifdef SIGTRAP
2203 sig_act.sa_sigaction = trap_handler;
2204 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
2205 #endif
2206
2207 #ifdef __HAVE_VM86
2208 sig_act.sa_sigaction = usr2_handler;
2209 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
2210 #endif
2211
2212 wine_ldt_init_locking( ldt_lock, ldt_unlock );
2213 return;
2214
2215 error:
2216 perror("sigaction");
2217 exit(1);
2218 }
2219
2220
2221 #ifdef __HAVE_VM86
2222 /**********************************************************************
2223 * __wine_enter_vm86 (NTDLL.@)
2224 *
2225 * Enter vm86 mode with the specified register context.
2226 */
2227 void __wine_enter_vm86( CONTEXT *context )
2228 {
2229 EXCEPTION_RECORD rec;
2230 int res;
2231 struct vm86plus_struct vm86;
2232
2233 memset( &vm86, 0, sizeof(vm86) );
2234 for (;;)
2235 {
2236 restore_vm86_context( context, &vm86 );
2237
2238 ntdll_get_thread_data()->vm86_ptr = &vm86;
2239 merge_vm86_pending_flags( &rec );
2240
2241 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
2242 if (res < 0)
2243 {
2244 errno = -res;
2245 return;
2246 }
2247
2248 save_vm86_context( context, &vm86 );
2249
2250 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
2251 rec.ExceptionRecord = NULL;
2252 rec.ExceptionAddress = (LPVOID)context->Eip;
2253 rec.NumberParameters = 0;
2254
2255 switch(VM86_TYPE(res))
2256 {
2257 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
2258 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
2259 break;
2260 case VM86_TRAP: /* return due to DOS-debugger request */
2261 switch(VM86_ARG(res))
2262 {
2263 case TRAP_x86_TRCTRAP: /* Single-step exception */
2264 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
2265 break;
2266 case TRAP_x86_BPTFLT: /* Breakpoint exception */
2267 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
2268 /* fall through */
2269 default:
2270 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
2271 break;
2272 }
2273 break;
2274 case VM86_INTx: /* int3/int x instruction (ARG = x) */
2275 rec.ExceptionCode = EXCEPTION_VM86_INTx;
2276 rec.NumberParameters = 1;
2277 rec.ExceptionInformation[0] = VM86_ARG(res);
2278 break;
2279 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
2280 context->EFlags |= VIF_FLAG;
2281 context->EFlags &= ~VIP_FLAG;
2282 get_vm86_teb_info()->vm86_pending = 0;
2283 rec.ExceptionCode = EXCEPTION_VM86_STI;
2284 break;
2285 case VM86_PICRETURN: /* return due to pending PIC request */
2286 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
2287 break;
2288 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
2289 default:
2290 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
2291 continue;
2292 }
2293 raise_exception( &rec, context, TRUE );
2294 }
2295 }
2296
2297 #else /* __HAVE_VM86 */
2298 /**********************************************************************
2299 * __wine_enter_vm86 (NTDLL.@)
2300 */
2301 void __wine_enter_vm86( CONTEXT *context )
2302 {
2303 MESSAGE("vm86 mode not supported on this platform\n");
2304 }
2305 #endif /* __HAVE_VM86 */
2306
2307
2308 /*******************************************************************
2309 * RtlUnwind (NTDLL.@)
2310 */
2311 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
2312 PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
2313 {
2314 EXCEPTION_RECORD record;
2315 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
2316 DWORD res;
2317
2318 context->Eax = (DWORD)retval;
2319
2320 /* build an exception record, if we do not have one */
2321 if (!pRecord)
2322 {
2323 record.ExceptionCode = STATUS_UNWIND;
2324 record.ExceptionFlags = 0;
2325 record.ExceptionRecord = NULL;
2326 record.ExceptionAddress = (void *)context->Eip;
2327 record.NumberParameters = 0;
2328 pRecord = &record;
2329 }
2330
2331 pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
2332
2333 TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
2334
2335 /* get chain of exception frames */
2336 frame = NtCurrentTeb()->Tib.ExceptionList;
2337 while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
2338 {
2339 /* Check frame address */
2340 if (pEndFrame && (frame > pEndFrame))
2341 raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
2342
2343 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
2344 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
2345 (UINT_PTR)frame & 3)
2346 raise_status( STATUS_BAD_STACK, pRecord );
2347
2348 /* Call handler */
2349 TRACE( "calling handler at %p code=%x flags=%x\n",
2350 frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
2351 res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
2352 TRACE( "handler at %p returned %x\n", frame->Handler, res );
2353
2354 switch(res)
2355 {
2356 case ExceptionContinueSearch:
2357 break;
2358 case ExceptionCollidedUnwind:
2359 frame = dispatch;
2360 break;
2361 default:
2362 raise_status( STATUS_INVALID_DISPOSITION, pRecord );
2363 break;
2364 }
2365 frame = __wine_pop_frame( frame );
2366 }
2367 }
2368 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 4 )
2369
2370
2371 /*******************************************************************
2372 * NtRaiseException (NTDLL.@)
2373 */
2374 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
2375 {
2376 NTSTATUS status = raise_exception( rec, context, first_chance );
2377 if (status == STATUS_SUCCESS)
2378 {
2379 set_debug_registers( context );
2380 set_cpu_context( context );
2381 }
2382 return status;
2383 }
2384
2385
2386 /***********************************************************************
2387 * RtlRaiseException (NTDLL.@)
2388 */
2389 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
2390 {
2391 NTSTATUS status;
2392
2393 rec->ExceptionAddress = (void *)context->Eip;
2394 status = raise_exception( rec, context, TRUE );
2395 if (status != STATUS_SUCCESS) raise_status( status, rec );
2396 }
2397 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )
2398
2399
2400 /*************************************************************************
2401 * RtlCaptureStackBackTrace (NTDLL.@)
2402 */
2403 USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
2404 {
2405 CONTEXT context;
2406 ULONG i;
2407 ULONG *frame;
2408
2409 RtlCaptureContext( &context );
2410 if (hash) *hash = 0;
2411 frame = (ULONG *)context.Ebp;
2412
2413 while (skip--)
2414 {
2415 if (((void *)frame < NtCurrentTeb()->Tib.StackLimit) ||
2416 ((void *)(frame + 1) >= NtCurrentTeb()->Tib.StackBase)) return 0;
2417 frame = (ULONG *)*frame;
2418 }
2419
2420 for (i = 0; i < count; i++)
2421 {
2422 if (((void *)frame < NtCurrentTeb()->Tib.StackLimit) ||
2423 ((void *)(frame + 1) >= NtCurrentTeb()->Tib.StackBase)) break;
2424 buffer[i] = (void *)frame[1];
2425 if (hash) *hash += frame[1];
2426 frame = (ULONG *)*frame;
2427 }
2428 return i;
2429 }
2430
2431
2432 /* wrapper for apps that don't declare the thread function correctly */
2433 extern void DECLSPEC_NORETURN call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg );
2434 __ASM_GLOBAL_FUNC(call_thread_func,
2435 "pushl %ebp\n\t"
2436 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2437 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2438 "movl %esp,%ebp\n\t"
2439 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2440 "subl $4,%esp\n\t"
2441 "pushl 12(%ebp)\n\t"
2442 "call *8(%ebp)\n\t"
2443 "leal -4(%ebp),%esp\n\t"
2444 "pushl %eax\n\t"
2445 "call " __ASM_NAME("exit_thread") "\n\t"
2446 "int $3" )
2447
2448 /***********************************************************************
2449 * call_thread_entry_point
2450 */
2451 void call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg )
2452 {
2453 __TRY
2454 {
2455 call_thread_func( entry, arg );
2456 }
2457 __EXCEPT(unhandled_exception_filter)
2458 {
2459 NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
2460 }
2461 __ENDTRY
2462 abort(); /* should not be reached */
2463 }
2464
2465 /***********************************************************************
2466 * RtlExitUserThread (NTDLL.@)
2467 */
2468 void WINAPI RtlExitUserThread( ULONG status )
2469 {
2470 exit_thread( status );
2471 }
2472
2473 /***********************************************************************
2474 * abort_thread
2475 */
2476 void abort_thread( int status )
2477 {
2478 terminate_thread( status );
2479 }
2480
2481 /**********************************************************************
2482 * DbgBreakPoint (NTDLL.@)
2483 */
2484 __ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
2485
2486 /**********************************************************************
2487 * DbgUserBreakPoint (NTDLL.@)
2488 */
2489 __ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
2490
2491 /**********************************************************************
2492 * NtCurrentTeb (NTDLL.@)
2493 */
2494 __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
2495
2496
2497 /**********************************************************************
2498 * EXC_CallHandler (internal)
2499 *
2500 * Some exception handlers depend on EBP to have a fixed position relative to
2501 * the exception frame.
2502 * Shrinker depends on (*1) doing what it does,
2503 * (*2) being the exact instruction it is and (*3) beginning with 0x64
2504 * (i.e. the %fs prefix to the movl instruction). It also depends on the
2505 * function calling the handler having only 5 parameters (*4).
2506 */
2507 __ASM_GLOBAL_FUNC( EXC_CallHandler,
2508 "pushl %ebp\n\t"
2509 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2510 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2511 "movl %esp,%ebp\n\t"
2512 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2513 "pushl %ebx\n\t"
2514 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2515 "movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
2516 "pushl 24(%ebp)\n\t"
2517 "pushl 20(%ebp)\n\t"
2518 "pushl 16(%ebp)\n\t"
2519 "pushl 12(%ebp)\n\t"
2520 "pushl 8(%ebp)\n\t"
2521 "call " __ASM_NAME("call_exception_handler") "\n\t"
2522 "popl %ebx\n\t"
2523 __ASM_CFI(".cfi_same_value %ebx\n\t")
2524 "leave\n"
2525 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2526 __ASM_CFI(".cfi_same_value %ebp\n\t")
2527 "ret" )
2528 __ASM_GLOBAL_FUNC(call_exception_handler,
2529 "pushl %ebp\n\t"
2530 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2531 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2532 "movl %esp,%ebp\n\t"
2533 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2534 "subl $12,%esp\n\t"
2535 "pushl 12(%ebp)\n\t" /* make any exceptions in this... */
2536 "pushl %edx\n\t" /* handler be handled by... */
2537 ".byte 0x64\n\t"
2538 "pushl (0)\n\t" /* nested_handler (passed in edx). */
2539 ".byte 0x64\n\t"
2540 "movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
2541 "pushl 20(%ebp)\n\t"
2542 "pushl 16(%ebp)\n\t"
2543 "pushl 12(%ebp)\n\t"
2544 "pushl 8(%ebp)\n\t"
2545 "movl 24(%ebp), %ecx\n\t" /* (*1) */
2546 "call *%ecx\n\t" /* call handler. (*2) */
2547 ".byte 0x64\n\t"
2548 "movl (0), %esp\n\t" /* restore previous... (*3) */
2549 ".byte 0x64\n\t"
2550 "popl (0)\n\t" /* exception frame. */
2551 "movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
2552 "popl %ebp\n\t"
2553 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2554 __ASM_CFI(".cfi_same_value %ebp\n\t")
2555 "ret $20" ) /* (*4) */
2556
2557 #endif /* __i386__ */
useful hacks and other patches not (yet) suitable for mainline