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ntdll: Move the _chkstk implementation to signal_i386.c.
[wine/multimedia.git] / dlls / ntdll / signal_i386.c
blob67633445953e0bcb5cbacc19bd2687126c9fda9f
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__) || defined(__DragonFly__)
212
213 #include <machine/trap.h>
214
215 typedef struct sigcontext SIGCONTEXT;
216
217 #define EAX_sig(context) ((context)->sc_eax)
218 #define EBX_sig(context) ((context)->sc_ebx)
219 #define ECX_sig(context) ((context)->sc_ecx)
220 #define EDX_sig(context) ((context)->sc_edx)
221 #define ESI_sig(context) ((context)->sc_esi)
222 #define EDI_sig(context) ((context)->sc_edi)
223 #define EBP_sig(context) ((context)->sc_ebp)
224
225 #define CS_sig(context) ((context)->sc_cs)
226 #define DS_sig(context) ((context)->sc_ds)
227 #define ES_sig(context) ((context)->sc_es)
228 #define FS_sig(context) ((context)->sc_fs)
229 #define GS_sig(context) ((context)->sc_gs)
230 #define SS_sig(context) ((context)->sc_ss)
231
232 #define TRAP_sig(context) ((context)->sc_trapno)
233 #define ERROR_sig(context) ((context)->sc_err)
234 #define EFL_sig(context) ((context)->sc_eflags)
235
236 #define EIP_sig(context) ((context)->sc_eip)
237 #define ESP_sig(context) ((context)->sc_esp)
238
239 #define FPU_sig(context) NULL /* FIXME */
240 #define FPUX_sig(context) NULL /* FIXME */
241
242 #endif /* __FreeBSD__ */
243
244 #ifdef __OpenBSD__
245
246 typedef struct sigcontext SIGCONTEXT;
247
248 #define EAX_sig(context) ((context)->sc_eax)
249 #define EBX_sig(context) ((context)->sc_ebx)
250 #define ECX_sig(context) ((context)->sc_ecx)
251 #define EDX_sig(context) ((context)->sc_edx)
252 #define ESI_sig(context) ((context)->sc_esi)
253 #define EDI_sig(context) ((context)->sc_edi)
254 #define EBP_sig(context) ((context)->sc_ebp)
255
256 #define CS_sig(context) ((context)->sc_cs)
257 #define DS_sig(context) ((context)->sc_ds)
258 #define ES_sig(context) ((context)->sc_es)
259 #define FS_sig(context) ((context)->sc_fs)
260 #define GS_sig(context) ((context)->sc_gs)
261 #define SS_sig(context) ((context)->sc_ss)
262
263 #define TRAP_sig(context) ((context)->sc_trapno)
264 #define ERROR_sig(context) ((context)->sc_err)
265 #define EFL_sig(context) ((context)->sc_eflags)
266
267 #define EIP_sig(context) ((context)->sc_eip)
268 #define ESP_sig(context) ((context)->sc_esp)
269
270 #define FPU_sig(context) NULL /* FIXME */
271 #define FPUX_sig(context) NULL /* FIXME */
272
273 #define T_MCHK T_MACHK
274 #define T_XMMFLT T_XFTRAP
275
276 #endif /* __OpenBSD__ */
277
278 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
279
280 #ifdef _SCO_DS
281 #include <sys/regset.h>
282 #endif
283 #include <sys/ucontext.h>
284 typedef struct ucontext SIGCONTEXT;
285
286 #ifdef _SCO_DS
287 #define gregs regs
288 #endif
289
290 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
291 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
292 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
293 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
294 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
295 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
296 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
297
298 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
299 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
300 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
301 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
302
303 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
304 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
305
306 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
307
308 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
309 #ifdef UESP
310 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
311 #elif defined(R_ESP)
312 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
313 #else
314 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
315 #endif
316 #ifdef ERR
317 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
318 #endif
319 #ifdef TRAPNO
320 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
321 #endif
322
323 #define FPU_sig(context) NULL /* FIXME */
324 #define FPUX_sig(context) NULL /* FIXME */
325
326 #endif /* svr4 || SCO_DS */
327
328 #ifdef __APPLE__
329 # include <sys/ucontext.h>
330
331 typedef ucontext_t SIGCONTEXT;
332
333 /* work around silly renaming of struct members in OS X 10.5 */
334 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
335 #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
336 #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
337 #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
338 #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
339 #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
340 #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
341 #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
342 #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
343 #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
344 #define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
345 #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
346 #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
347 #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
348 #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
349 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
350 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
351 #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
352 #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
353 #define FPU_sig(context) NULL
354 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
355 #else
356 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
357 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
358 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
359 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
360 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
361 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
362 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
363 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
364 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
365 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
366 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
367 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
368 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
369 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
370 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
371 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
372 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
373 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
374 #define FPU_sig(context) NULL
375 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
376 #endif
377
378 #endif /* __APPLE__ */
379
380 #if defined(__NetBSD__)
381 # include <sys/ucontext.h>
382 # include <sys/types.h>
383 # include <signal.h>
384
385 typedef ucontext_t SIGCONTEXT;
386
387 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
388 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
389 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
390 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
391 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
392 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
393 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
394 #define ESP_sig(context) _UC_MACHINE_SP(context)
395
396 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
397 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
398 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
399 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
400 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
401 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
402
403 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
404 #define EIP_sig(context) _UC_MACHINE_PC(context)
405 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
406 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
407
408 #define FPU_sig(context) NULL
409 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
410
411 #define T_MCHK T_MCA
412 #define T_XMMFLT T_XMM
413
414 #endif /* __NetBSD__ */
415
416 WINE_DEFAULT_DEBUG_CHANNEL(seh);
417
418 typedef int (*wine_signal_handler)(unsigned int sig);
419
420 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
421 static size_t signal_stack_mask;
422 static size_t signal_stack_size;
423
424 static wine_signal_handler handlers[256];
425
426 static int fpux_support; /* whether the CPU support extended fpu context */
427
428 extern void DECLSPEC_NORETURN __wine_restore_regs( const CONTEXT *context );
429
430 enum i386_trap_code
431 {
432 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
433 #if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
434 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
435 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
436 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
437 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
438 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
439 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
440 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
441 TRAP_x86_DNA = T_DNA, /* Device not available exception */
442 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
443 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
444 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
445 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
446 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
447 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
448 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
449 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
450 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
451 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
452 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
453 #else
454 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
455 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
456 TRAP_x86_NMI = 2, /* NMI interrupt */
457 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
458 TRAP_x86_OFLOW = 4, /* Overflow exception */
459 TRAP_x86_BOUND = 5, /* Bound range exception */
460 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
461 TRAP_x86_DNA = 7, /* Device not available exception */
462 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
463 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
464 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
465 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
466 TRAP_x86_STKFLT = 12, /* Stack fault */
467 TRAP_x86_PROTFLT = 13, /* General protection fault */
468 TRAP_x86_PAGEFLT = 14, /* Page fault */
469 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
470 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
471 TRAP_x86_MCHK = 18, /* Machine check exception */
472 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
473 otherwise Cache flush exception (via SIGSEV) */
474 #endif
475 };
476
477 /* Exception record for handling exceptions happening inside exception handlers */
478 typedef struct
479 {
480 EXCEPTION_REGISTRATION_RECORD frame;
481 EXCEPTION_REGISTRATION_RECORD *prevFrame;
482 } EXC_NESTED_FRAME;
483
484 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
485 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
486 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );
487
488 /***********************************************************************
489 * dispatch_signal
490 */
491 static inline int dispatch_signal(unsigned int sig)
492 {
493 if (handlers[sig] == NULL) return 0;
494 return handlers[sig](sig);
495 }
496
497
498 /***********************************************************************
499 * get_trap_code
500 *
501 * Get the trap code for a signal.
502 */
503 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
504 {
505 #ifdef TRAP_sig
506 return TRAP_sig(sigcontext);
507 #else
508 return TRAP_x86_UNKNOWN; /* unknown trap code */
509 #endif
510 }
511
512 /***********************************************************************
513 * get_error_code
514 *
515 * Get the error code for a signal.
516 */
517 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
518 {
519 #ifdef ERROR_sig
520 return ERROR_sig(sigcontext);
521 #else
522 return 0;
523 #endif
524 }
525
526 /***********************************************************************
527 * get_signal_stack
528 *
529 * Get the base of the signal stack for the current thread.
530 */
531 static inline void *get_signal_stack(void)
532 {
533 return (char *)NtCurrentTeb() + 4096;
534 }
535
536
537 /***********************************************************************
538 * get_current_teb
539 *
540 * Get the current teb based on the stack pointer.
541 */
542 static inline TEB *get_current_teb(void)
543 {
544 unsigned long esp;
545 __asm__("movl %%esp,%0" : "=g" (esp) );
546 return (TEB *)(esp & ~signal_stack_mask);
547 }
548
549
550 /*******************************************************************
551 * is_valid_frame
552 */
553 static inline BOOL is_valid_frame( void *frame )
554 {
555 if ((ULONG_PTR)frame & 3) return FALSE;
556 return (frame >= NtCurrentTeb()->Tib.StackLimit &&
557 (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
558 }
559
560 /*******************************************************************
561 * raise_handler
562 *
563 * Handler for exceptions happening inside a handler.
564 */
565 static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
566 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
567 {
568 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
569 return ExceptionContinueSearch;
570 /* We shouldn't get here so we store faulty frame in dispatcher */
571 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
572 return ExceptionNestedException;
573 }
574
575
576 /*******************************************************************
577 * unwind_handler
578 *
579 * Handler for exceptions happening inside an unwind handler.
580 */
581 static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
582 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
583 {
584 if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
585 return ExceptionContinueSearch;
586 /* We shouldn't get here so we store faulty frame in dispatcher */
587 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
588 return ExceptionCollidedUnwind;
589 }
590
591
592 /**********************************************************************
593 * call_stack_handlers
594 *
595 * Call the stack handlers chain.
596 */
597 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
598 {
599 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
600 DWORD res;
601
602 frame = NtCurrentTeb()->Tib.ExceptionList;
603 nested_frame = NULL;
604 while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
605 {
606 /* Check frame address */
607 if (!is_valid_frame( frame ))
608 {
609 rec->ExceptionFlags |= EH_STACK_INVALID;
610 break;
611 }
612
613 /* Call handler */
614 TRACE( "calling handler at %p code=%x flags=%x\n",
615 frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
616 res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
617 TRACE( "handler at %p returned %x\n", frame->Handler, res );
618
619 if (frame == nested_frame)
620 {
621 /* no longer nested */
622 nested_frame = NULL;
623 rec->ExceptionFlags &= ~EH_NESTED_CALL;
624 }
625
626 switch(res)
627 {
628 case ExceptionContinueExecution:
629 if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
630 return STATUS_NONCONTINUABLE_EXCEPTION;
631 case ExceptionContinueSearch:
632 break;
633 case ExceptionNestedException:
634 if (nested_frame < dispatch) nested_frame = dispatch;
635 rec->ExceptionFlags |= EH_NESTED_CALL;
636 break;
637 default:
638 return STATUS_INVALID_DISPOSITION;
639 }
640 frame = frame->Prev;
641 }
642 return STATUS_UNHANDLED_EXCEPTION;
643 }
644
645
646 /*******************************************************************
647 * raise_exception
648 *
649 * Implementation of NtRaiseException.
650 */
651 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
652 {
653 NTSTATUS status;
654
655 if (first_chance)
656 {
657 DWORD c;
658
659 TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
660 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
661 context->Eip, GetCurrentThreadId() );
662 for (c = 0; c < rec->NumberParameters; c++)
663 TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
664 if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
665 {
666 if (rec->ExceptionInformation[1] >> 16)
667 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
668 rec->ExceptionAddress,
669 (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
670 else
671 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
672 rec->ExceptionAddress,
673 (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
674 }
675 else
676 {
677 TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
678 context->Eax, context->Ebx, context->Ecx,
679 context->Edx, context->Esi, context->Edi );
680 TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
681 context->Ebp, context->Esp, context->SegCs, context->SegDs,
682 context->SegEs, context->SegFs, context->SegGs, context->EFlags );
683 }
684 status = send_debug_event( rec, TRUE, context );
685 if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
686 return STATUS_SUCCESS;
687
688 /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
689 if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
690
691 if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
692 return STATUS_SUCCESS;
693
694 if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
695 return status;
696 }
697
698 /* last chance exception */
699
700 status = send_debug_event( rec, FALSE, context );
701 if (status != DBG_CONTINUE)
702 {
703 if (rec->ExceptionFlags & EH_STACK_INVALID)
704 WINE_ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
705 else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
706 WINE_ERR("Process attempted to continue execution after noncontinuable exception.\n");
707 else
708 WINE_ERR("Unhandled exception code %x flags %x addr %p\n",
709 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
710 NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
711 }
712 return STATUS_SUCCESS;
713 }
714
715
716 #ifdef __HAVE_VM86
717 /***********************************************************************
718 * save_vm86_context
719 *
720 * Set the register values from a vm86 structure.
721 */
722 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
723 {
724 context->ContextFlags = CONTEXT_FULL;
725 context->Eax = vm86->regs.eax;
726 context->Ebx = vm86->regs.ebx;
727 context->Ecx = vm86->regs.ecx;
728 context->Edx = vm86->regs.edx;
729 context->Esi = vm86->regs.esi;
730 context->Edi = vm86->regs.edi;
731 context->Esp = vm86->regs.esp;
732 context->Ebp = vm86->regs.ebp;
733 context->Eip = vm86->regs.eip;
734 context->SegCs = vm86->regs.cs;
735 context->SegDs = vm86->regs.ds;
736 context->SegEs = vm86->regs.es;
737 context->SegFs = vm86->regs.fs;
738 context->SegGs = vm86->regs.gs;
739 context->SegSs = vm86->regs.ss;
740 context->EFlags = vm86->regs.eflags;
741 }
742
743
744 /***********************************************************************
745 * restore_vm86_context
746 *
747 * Build a vm86 structure from the register values.
748 */
749 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
750 {
751 vm86->regs.eax = context->Eax;
752 vm86->regs.ebx = context->Ebx;
753 vm86->regs.ecx = context->Ecx;
754 vm86->regs.edx = context->Edx;
755 vm86->regs.esi = context->Esi;
756 vm86->regs.edi = context->Edi;
757 vm86->regs.esp = context->Esp;
758 vm86->regs.ebp = context->Ebp;
759 vm86->regs.eip = context->Eip;
760 vm86->regs.cs = context->SegCs;
761 vm86->regs.ds = context->SegDs;
762 vm86->regs.es = context->SegEs;
763 vm86->regs.fs = context->SegFs;
764 vm86->regs.gs = context->SegGs;
765 vm86->regs.ss = context->SegSs;
766 vm86->regs.eflags = context->EFlags;
767 }
768
769
770 /**********************************************************************
771 * merge_vm86_pending_flags
772 *
773 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
774 * raises exception if there are pending events and VIF flag
775 * has been turned on.
776 *
777 * Called from __wine_enter_vm86 because vm86_enter
778 * doesn't check for pending events.
779 *
780 * Called from raise_vm86_sti_exception to check for
781 * pending events in a signal safe way.
782 */
783 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
784 {
785 BOOL check_pending = TRUE;
786 struct vm86plus_struct *vm86 =
787 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
788
789 /*
790 * In order to prevent a race when SIGUSR2 occurs while
791 * we are returning from exception handler, pending events
792 * will be rechecked after each raised exception.
793 */
794 while (check_pending && get_vm86_teb_info()->vm86_pending)
795 {
796 check_pending = FALSE;
797 ntdll_get_thread_data()->vm86_ptr = NULL;
798
799 /*
800 * If VIF is set, throw exception.
801 * Note that SIGUSR2 may turn VIF flag off so
802 * VIF check must occur only when TEB.vm86_ptr is NULL.
803 */
804 if (vm86->regs.eflags & VIF_FLAG)
805 {
806 CONTEXT vcontext;
807 save_vm86_context( &vcontext, vm86 );
808
809 rec->ExceptionCode = EXCEPTION_VM86_STI;
810 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
811 rec->ExceptionRecord = NULL;
812 rec->NumberParameters = 0;
813 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
814
815 vcontext.EFlags &= ~VIP_FLAG;
816 get_vm86_teb_info()->vm86_pending = 0;
817 raise_exception( rec, &vcontext, TRUE );
818
819 restore_vm86_context( &vcontext, vm86 );
820 check_pending = TRUE;
821 }
822
823 ntdll_get_thread_data()->vm86_ptr = vm86;
824 }
825
826 /*
827 * Merge VIP flags in a signal safe way. This requires
828 * that the following operation compiles into atomic
829 * instruction.
830 */
831 vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
832 }
833 #endif /* __HAVE_VM86 */
834
835
836 #ifdef __sun
837
838 /* We have to workaround two Solaris breakages:
839 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
840 * code crash badly.
841 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
842 * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
843 */
844
845 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
846 __ASM_GLOBAL_FUNC( sigaction_syscall,
847 "movl $0x62,%eax\n\t"
848 "int $0x91\n\t"
849 "ret" )
850
851 /* assume the same libc handler is used for all signals */
852 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
853
854 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
855 {
856 struct ntdll_thread_data *thread_data;
857
858 __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
859
860 thread_data = (struct ntdll_thread_data *)get_current_teb()->SpareBytes1;
861 wine_set_fs( thread_data->fs );
862 wine_set_gs( thread_data->gs );
863
864 libc_sigacthandler( signal, siginfo, sigcontext );
865 }
866
867 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
868 {
869 struct sigaction real_act;
870
871 if (sigaction( sig, new, old ) == -1) return -1;
872
873 /* retrieve the real handler and flags with a direct syscall */
874 sigaction_syscall( sig, NULL, &real_act );
875 libc_sigacthandler = real_act.sa_sigaction;
876 real_act.sa_sigaction = wine_sigacthandler;
877 sigaction_syscall( sig, &real_act, NULL );
878 return 0;
879 }
880 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
881
882 #endif
883
884 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
885
886 extern void clear_alignment_flag(void);
887 __ASM_GLOBAL_FUNC( clear_alignment_flag,
888 "pushfl\n\t"
889 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
890 "andl $~0x40000,(%esp)\n\t"
891 "popfl\n\t"
892 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
893 "ret" )
894
895
896 /***********************************************************************
897 * init_handler
898 *
899 * Handler initialization when the full context is not needed.
900 * Return the stack pointer to use for pushing the exception data.
901 */
902 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
903 {
904 TEB *teb = get_current_teb();
905
906 clear_alignment_flag();
907
908 /* get %fs and %gs at time of the fault */
909 #ifdef FS_sig
910 *fs = LOWORD(FS_sig(sigcontext));
911 #else
912 *fs = wine_get_fs();
913 #endif
914 #ifdef GS_sig
915 *gs = LOWORD(GS_sig(sigcontext));
916 #else
917 *gs = wine_get_gs();
918 #endif
919
920 #ifndef __sun /* see above for Solaris handling */
921 {
922 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
923 wine_set_fs( thread_data->fs );
924 wine_set_gs( thread_data->gs );
925 }
926 #endif
927
928 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
929 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
930 {
931 /*
932 * Win16 or DOS protected mode. Note that during switch
933 * from 16-bit mode to linear mode, CS may be set to system
934 * segment before FS is restored. Fortunately, in this case
935 * SS is still non-system segment. This is why both CS and SS
936 * are checked.
937 */
938 return teb->WOW32Reserved;
939 }
940 return (void *)(ESP_sig(sigcontext) & ~3);
941 }
942
943
944 /***********************************************************************
945 * save_fpu
946 *
947 * Save the thread FPU context.
948 */
949 static inline void save_fpu( CONTEXT *context )
950 {
951 #ifdef __GNUC__
952 context->ContextFlags |= CONTEXT_FLOATING_POINT;
953 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
954 #endif
955 }
956
957
958 /***********************************************************************
959 * save_fpux
960 *
961 * Save the thread FPU extended context.
962 */
963 static inline void save_fpux( CONTEXT *context )
964 {
965 #ifdef __GNUC__
966 /* we have to enforce alignment by hand */
967 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
968 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
969
970 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
971 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
972 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
973 #endif
974 }
975
976
977 /***********************************************************************
978 * restore_fpu
979 *
980 * Restore the FPU context to a sigcontext.
981 */
982 static inline void restore_fpu( const CONTEXT *context )
983 {
984 FLOATING_SAVE_AREA float_status = context->FloatSave;
985 /* reset the current interrupt status */
986 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
987 #ifdef __GNUC__
988 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
989 #endif /* __GNUC__ */
990 }
991
992
993 /***********************************************************************
994 * restore_fpux
995 *
996 * Restore the FPU extended context to a sigcontext.
997 */
998 static inline void restore_fpux( const CONTEXT *context )
999 {
1000 #ifdef __GNUC__
1001 /* we have to enforce alignment by hand */
1002 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
1003 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
1004
1005 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
1006 /* reset the current interrupt status */
1007 state->StatusWord &= state->ControlWord | 0xff80;
1008 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
1009 #endif
1010 }
1011
1012
1013 /***********************************************************************
1014 * fpux_to_fpu
1015 *
1016 * Build a standard FPU context from an extended one.
1017 */
1018 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
1019 {
1020 unsigned int i, tag, stack_top;
1021
1022 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
1023 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
1024 fpu->ErrorOffset = fpux->ErrorOffset;
1025 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
1026 fpu->DataOffset = fpux->DataOffset;
1027 fpu->DataSelector = fpux->DataSelector;
1028 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
1029
1030 stack_top = (fpux->StatusWord >> 11) & 7;
1031 fpu->TagWord = 0xffff0000;
1032 for (i = 0; i < 8; i++)
1033 {
1034 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
1035 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
1036 else
1037 {
1038 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
1039 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
1040 {
1041 tag = 2; /* special */
1042 }
1043 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
1044 {
1045 if (reg->Low) tag = 2; /* special */
1046 else tag = 1; /* zero */
1047 }
1048 else
1049 {
1050 if (reg->Low >> 63) tag = 0; /* valid */
1051 else tag = 2; /* special */
1052 }
1053 }
1054 fpu->TagWord |= tag << (2 * i);
1055 }
1056 }
1057
1058
1059 /***********************************************************************
1060 * save_context
1061 *
1062 * Build a context structure from the signal info.
1063 */
1064 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
1065 {
1066 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1067 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1068 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1069
1070 memset(context, 0, sizeof(*context));
1071 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
1072 context->Eax = EAX_sig(sigcontext);
1073 context->Ebx = EBX_sig(sigcontext);
1074 context->Ecx = ECX_sig(sigcontext);
1075 context->Edx = EDX_sig(sigcontext);
1076 context->Esi = ESI_sig(sigcontext);
1077 context->Edi = EDI_sig(sigcontext);
1078 context->Ebp = EBP_sig(sigcontext);
1079 context->EFlags = EFL_sig(sigcontext);
1080 context->Eip = EIP_sig(sigcontext);
1081 context->Esp = ESP_sig(sigcontext);
1082 context->SegCs = LOWORD(CS_sig(sigcontext));
1083 context->SegDs = LOWORD(DS_sig(sigcontext));
1084 context->SegEs = LOWORD(ES_sig(sigcontext));
1085 context->SegFs = fs;
1086 context->SegGs = gs;
1087 context->SegSs = LOWORD(SS_sig(sigcontext));
1088 context->Dr0 = regs->dr0;
1089 context->Dr1 = regs->dr1;
1090 context->Dr2 = regs->dr2;
1091 context->Dr3 = regs->dr3;
1092 context->Dr6 = regs->dr6;
1093 context->Dr7 = regs->dr7;
1094
1095 if (fpu)
1096 {
1097 context->ContextFlags |= CONTEXT_FLOATING_POINT;
1098 context->FloatSave = *fpu;
1099 }
1100 if (fpux)
1101 {
1102 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
1103 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
1104 fpux_support = 1;
1105 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
1106 }
1107 if (!fpu && !fpux) save_fpu( context );
1108 }
1109
1110
1111 /***********************************************************************
1112 * restore_context
1113 *
1114 * Restore the signal info from the context.
1115 */
1116 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
1117 {
1118 struct ntdll_thread_data * const regs = ntdll_get_thread_data();
1119 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
1120 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
1121
1122 regs->dr0 = context->Dr0;
1123 regs->dr1 = context->Dr1;
1124 regs->dr2 = context->Dr2;
1125 regs->dr3 = context->Dr3;
1126 regs->dr6 = context->Dr6;
1127 regs->dr7 = context->Dr7;
1128 EAX_sig(sigcontext) = context->Eax;
1129 EBX_sig(sigcontext) = context->Ebx;
1130 ECX_sig(sigcontext) = context->Ecx;
1131 EDX_sig(sigcontext) = context->Edx;
1132 ESI_sig(sigcontext) = context->Esi;
1133 EDI_sig(sigcontext) = context->Edi;
1134 EBP_sig(sigcontext) = context->Ebp;
1135 EFL_sig(sigcontext) = context->EFlags;
1136 EIP_sig(sigcontext) = context->Eip;
1137 ESP_sig(sigcontext) = context->Esp;
1138 CS_sig(sigcontext) = context->SegCs;
1139 DS_sig(sigcontext) = context->SegDs;
1140 ES_sig(sigcontext) = context->SegEs;
1141 SS_sig(sigcontext) = context->SegSs;
1142 #ifdef GS_sig
1143 GS_sig(sigcontext) = context->SegGs;
1144 #else
1145 wine_set_gs( context->SegGs );
1146 #endif
1147 #ifdef FS_sig
1148 FS_sig(sigcontext) = context->SegFs;
1149 #else
1150 wine_set_fs( context->SegFs );
1151 #endif
1152
1153 if (fpu) *fpu = context->FloatSave;
1154 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
1155 if (!fpu && !fpux) restore_fpu( context );
1156 }
1157
1158
1159 /***********************************************************************
1160 * RtlCaptureContext (NTDLL.@)
1161 */
1162 __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
1163 "pushl %eax\n\t"
1164 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
1165 "movl 8(%esp),%eax\n\t" /* context */
1166 "movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
1167 "movw %gs,0x8c(%eax)\n\t" /* context->SegGs */
1168 "movw %fs,0x90(%eax)\n\t" /* context->SegFs */
1169 "movw %es,0x94(%eax)\n\t" /* context->SegEs */
1170 "movw %ds,0x98(%eax)\n\t" /* context->SegDs */
1171 "movl %edi,0x9c(%eax)\n\t" /* context->Edi */
1172 "movl %esi,0xa0(%eax)\n\t" /* context->Esi */
1173 "movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
1174 "movl %edx,0xa8(%eax)\n\t" /* context->Edx */
1175 "movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
1176 "movl %ebp,0xb4(%eax)\n\t" /* context->Ebp */
1177 "movl 4(%esp),%edx\n\t"
1178 "movl %edx,0xb8(%eax)\n\t" /* context->Eip */
1179 "movw %cs,0xbc(%eax)\n\t" /* context->SegCs */
1180 "pushfl\n\t"
1181 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
1182 "popl 0xc0(%eax)\n\t" /* context->EFlags */
1183 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
1184 "leal 8(%esp),%edx\n\t"
1185 "movl %edx,0xc4(%eax)\n\t" /* context->Esp */
1186 "movw %ss,0xc8(%eax)\n\t" /* context->SegSs */
1187 "popl 0xb0(%eax)\n\t" /* context->Eax */
1188 __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
1189 "ret $4" )
1190
1191
1192 /***********************************************************************
1193 * set_cpu_context
1194 *
1195 * Set the new CPU context. Used by NtSetContextThread.
1196 */
1197 void set_cpu_context( const CONTEXT *context )
1198 {
1199 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1200
1201 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
1202 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
1203
1204 if (flags & CONTEXT_DEBUG_REGISTERS)
1205 {
1206 ntdll_get_thread_data()->dr0 = context->Dr0;
1207 ntdll_get_thread_data()->dr1 = context->Dr1;
1208 ntdll_get_thread_data()->dr2 = context->Dr2;
1209 ntdll_get_thread_data()->dr3 = context->Dr3;
1210 ntdll_get_thread_data()->dr6 = context->Dr6;
1211 ntdll_get_thread_data()->dr7 = context->Dr7;
1212 }
1213 if (flags & CONTEXT_FULL)
1214 {
1215 if (!(flags & CONTEXT_CONTROL))
1216 FIXME( "setting partial context (%x) not supported\n", flags );
1217 else if (flags & CONTEXT_SEGMENTS)
1218 __wine_restore_regs( context );
1219 else
1220 {
1221 CONTEXT newcontext = *context;
1222 newcontext.SegDs = wine_get_ds();
1223 newcontext.SegEs = wine_get_es();
1224 newcontext.SegFs = wine_get_fs();
1225 newcontext.SegGs = wine_get_gs();
1226 __wine_restore_regs( &newcontext );
1227 }
1228 }
1229 }
1230
1231
1232 /***********************************************************************
1233 * set_debug_registers
1234 */
1235 static void set_debug_registers( const CONTEXT *context )
1236 {
1237 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
1238 context_t server_context;
1239
1240 if (!(flags & CONTEXT_DEBUG_REGISTERS)) return;
1241 if (ntdll_get_thread_data()->dr0 == context->Dr0 &&
1242 ntdll_get_thread_data()->dr1 == context->Dr1 &&
1243 ntdll_get_thread_data()->dr2 == context->Dr2 &&
1244 ntdll_get_thread_data()->dr3 == context->Dr3 &&
1245 ntdll_get_thread_data()->dr6 == context->Dr6 &&
1246 ntdll_get_thread_data()->dr7 == context->Dr7) return;
1247
1248 context_to_server( &server_context, context );
1249
1250 SERVER_START_REQ( set_thread_context )
1251 {
1252 req->handle = wine_server_obj_handle( GetCurrentThread() );
1253 req->suspend = 0;
1254 wine_server_add_data( req, &server_context, sizeof(server_context) );
1255 wine_server_call( req );
1256 }
1257 SERVER_END_REQ;
1258 }
1259
1260
1261 /***********************************************************************
1262 * copy_context
1263 *
1264 * Copy a register context according to the flags.
1265 */
1266 void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
1267 {
1268 flags &= ~CONTEXT_i386; /* get rid of CPU id */
1269 if (flags & CONTEXT_INTEGER)
1270 {
1271 to->Eax = from->Eax;
1272 to->Ebx = from->Ebx;
1273 to->Ecx = from->Ecx;
1274 to->Edx = from->Edx;
1275 to->Esi = from->Esi;
1276 to->Edi = from->Edi;
1277 }
1278 if (flags & CONTEXT_CONTROL)
1279 {
1280 to->Ebp = from->Ebp;
1281 to->Esp = from->Esp;
1282 to->Eip = from->Eip;
1283 to->SegCs = from->SegCs;
1284 to->SegSs = from->SegSs;
1285 to->EFlags = from->EFlags;
1286 }
1287 if (flags & CONTEXT_SEGMENTS)
1288 {
1289 to->SegDs = from->SegDs;
1290 to->SegEs = from->SegEs;
1291 to->SegFs = from->SegFs;
1292 to->SegGs = from->SegGs;
1293 }
1294 if (flags & CONTEXT_DEBUG_REGISTERS)
1295 {
1296 to->Dr0 = from->Dr0;
1297 to->Dr1 = from->Dr1;
1298 to->Dr2 = from->Dr2;
1299 to->Dr3 = from->Dr3;
1300 to->Dr6 = from->Dr6;
1301 to->Dr7 = from->Dr7;
1302 }
1303 if (flags & CONTEXT_FLOATING_POINT)
1304 {
1305 to->FloatSave = from->FloatSave;
1306 }
1307 if (flags & CONTEXT_EXTENDED_REGISTERS)
1308 {
1309 memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
1310 }
1311 }
1312
1313
1314 /***********************************************************************
1315 * context_to_server
1316 *
1317 * Convert a register context to the server format.
1318 */
1319 NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
1320 {
1321 DWORD flags = from->ContextFlags & ~CONTEXT_i386; /* get rid of CPU id */
1322
1323 memset( to, 0, sizeof(*to) );
1324 to->cpu = CPU_x86;
1325
1326 if (flags & CONTEXT_CONTROL)
1327 {
1328 to->flags |= SERVER_CTX_CONTROL;
1329 to->ctl.i386_regs.ebp = from->Ebp;
1330 to->ctl.i386_regs.esp = from->Esp;
1331 to->ctl.i386_regs.eip = from->Eip;
1332 to->ctl.i386_regs.cs = from->SegCs;
1333 to->ctl.i386_regs.ss = from->SegSs;
1334 to->ctl.i386_regs.eflags = from->EFlags;
1335 }
1336 if (flags & CONTEXT_INTEGER)
1337 {
1338 to->flags |= SERVER_CTX_INTEGER;
1339 to->integer.i386_regs.eax = from->Eax;
1340 to->integer.i386_regs.ebx = from->Ebx;
1341 to->integer.i386_regs.ecx = from->Ecx;
1342 to->integer.i386_regs.edx = from->Edx;
1343 to->integer.i386_regs.esi = from->Esi;
1344 to->integer.i386_regs.edi = from->Edi;
1345 }
1346 if (flags & CONTEXT_SEGMENTS)
1347 {
1348 to->flags |= SERVER_CTX_SEGMENTS;
1349 to->seg.i386_regs.ds = from->SegDs;
1350 to->seg.i386_regs.es = from->SegEs;
1351 to->seg.i386_regs.fs = from->SegFs;
1352 to->seg.i386_regs.gs = from->SegGs;
1353 }
1354 if (flags & CONTEXT_FLOATING_POINT)
1355 {
1356 to->flags |= SERVER_CTX_FLOATING_POINT;
1357 to->fp.i386_regs.ctrl = from->FloatSave.ControlWord;
1358 to->fp.i386_regs.status = from->FloatSave.StatusWord;
1359 to->fp.i386_regs.tag = from->FloatSave.TagWord;
1360 to->fp.i386_regs.err_off = from->FloatSave.ErrorOffset;
1361 to->fp.i386_regs.err_sel = from->FloatSave.ErrorSelector;
1362 to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
1363 to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
1364 to->fp.i386_regs.cr0npx = from->FloatSave.Cr0NpxState;
1365 memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
1366 }
1367 if (flags & CONTEXT_DEBUG_REGISTERS)
1368 {
1369 to->flags |= SERVER_CTX_DEBUG_REGISTERS;
1370 to->debug.i386_regs.dr0 = from->Dr0;
1371 to->debug.i386_regs.dr1 = from->Dr1;
1372 to->debug.i386_regs.dr2 = from->Dr2;
1373 to->debug.i386_regs.dr3 = from->Dr3;
1374 to->debug.i386_regs.dr6 = from->Dr6;
1375 to->debug.i386_regs.dr7 = from->Dr7;
1376 }
1377 if (flags & CONTEXT_EXTENDED_REGISTERS)
1378 {
1379 to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
1380 memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
1381 }
1382 return STATUS_SUCCESS;
1383 }
1384
1385
1386 /***********************************************************************
1387 * context_from_server
1388 *
1389 * Convert a register context from the server format.
1390 */
1391 NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
1392 {
1393 if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;
1394
1395 to->ContextFlags = CONTEXT_i386;
1396 if (from->flags & SERVER_CTX_CONTROL)
1397 {
1398 to->ContextFlags |= CONTEXT_CONTROL;
1399 to->Ebp = from->ctl.i386_regs.ebp;
1400 to->Esp = from->ctl.i386_regs.esp;
1401 to->Eip = from->ctl.i386_regs.eip;
1402 to->SegCs = from->ctl.i386_regs.cs;
1403 to->SegSs = from->ctl.i386_regs.ss;
1404 to->EFlags = from->ctl.i386_regs.eflags;
1405 }
1406 if (from->flags & SERVER_CTX_INTEGER)
1407 {
1408 to->ContextFlags |= CONTEXT_INTEGER;
1409 to->Eax = from->integer.i386_regs.eax;
1410 to->Ebx = from->integer.i386_regs.ebx;
1411 to->Ecx = from->integer.i386_regs.ecx;
1412 to->Edx = from->integer.i386_regs.edx;
1413 to->Esi = from->integer.i386_regs.esi;
1414 to->Edi = from->integer.i386_regs.edi;
1415 }
1416 if (from->flags & SERVER_CTX_SEGMENTS)
1417 {
1418 to->ContextFlags |= CONTEXT_SEGMENTS;
1419 to->SegDs = from->seg.i386_regs.ds;
1420 to->SegEs = from->seg.i386_regs.es;
1421 to->SegFs = from->seg.i386_regs.fs;
1422 to->SegGs = from->seg.i386_regs.gs;
1423 }
1424 if (from->flags & SERVER_CTX_FLOATING_POINT)
1425 {
1426 to->ContextFlags |= CONTEXT_FLOATING_POINT;
1427 to->FloatSave.ControlWord = from->fp.i386_regs.ctrl;
1428 to->FloatSave.StatusWord = from->fp.i386_regs.status;
1429 to->FloatSave.TagWord = from->fp.i386_regs.tag;
1430 to->FloatSave.ErrorOffset = from->fp.i386_regs.err_off;
1431 to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
1432 to->FloatSave.DataOffset = from->fp.i386_regs.data_off;
1433 to->FloatSave.DataSelector = from->fp.i386_regs.data_sel;
1434 to->FloatSave.Cr0NpxState = from->fp.i386_regs.cr0npx;
1435 memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
1436 }
1437 if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
1438 {
1439 to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
1440 to->Dr0 = from->debug.i386_regs.dr0;
1441 to->Dr1 = from->debug.i386_regs.dr1;
1442 to->Dr2 = from->debug.i386_regs.dr2;
1443 to->Dr3 = from->debug.i386_regs.dr3;
1444 to->Dr6 = from->debug.i386_regs.dr6;
1445 to->Dr7 = from->debug.i386_regs.dr7;
1446 }
1447 if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
1448 {
1449 to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
1450 memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
1451 }
1452 return STATUS_SUCCESS;
1453 }
1454
1455
1456 /***********************************************************************
1457 * is_privileged_instr
1458 *
1459 * Check if the fault location is a privileged instruction.
1460 * Based on the instruction emulation code in dlls/kernel/instr.c.
1461 */
1462 static inline DWORD is_privileged_instr( CONTEXT *context )
1463 {
1464 const BYTE *instr;
1465 unsigned int prefix_count = 0;
1466
1467 if (!wine_ldt_is_system( context->SegCs )) return 0;
1468 instr = (BYTE *)context->Eip;
1469
1470 for (;;) switch(*instr)
1471 {
1472 /* instruction prefixes */
1473 case 0x2e: /* %cs: */
1474 case 0x36: /* %ss: */
1475 case 0x3e: /* %ds: */
1476 case 0x26: /* %es: */
1477 case 0x64: /* %fs: */
1478 case 0x65: /* %gs: */
1479 case 0x66: /* opcode size */
1480 case 0x67: /* addr size */
1481 case 0xf0: /* lock */
1482 case 0xf2: /* repne */
1483 case 0xf3: /* repe */
1484 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1485 instr++;
1486 continue;
1487
1488 case 0x0f: /* extended instruction */
1489 switch(instr[1])
1490 {
1491 case 0x20: /* mov crX, reg */
1492 case 0x21: /* mov drX, reg */
1493 case 0x22: /* mov reg, crX */
1494 case 0x23: /* mov reg drX */
1495 return EXCEPTION_PRIV_INSTRUCTION;
1496 }
1497 return 0;
1498 case 0x6c: /* insb (%dx) */
1499 case 0x6d: /* insl (%dx) */
1500 case 0x6e: /* outsb (%dx) */
1501 case 0x6f: /* outsl (%dx) */
1502 case 0xcd: /* int $xx */
1503 case 0xe4: /* inb al,XX */
1504 case 0xe5: /* in (e)ax,XX */
1505 case 0xe6: /* outb XX,al */
1506 case 0xe7: /* out XX,(e)ax */
1507 case 0xec: /* inb (%dx),%al */
1508 case 0xed: /* inl (%dx),%eax */
1509 case 0xee: /* outb %al,(%dx) */
1510 case 0xef: /* outl %eax,(%dx) */
1511 case 0xf4: /* hlt */
1512 case 0xfa: /* cli */
1513 case 0xfb: /* sti */
1514 return EXCEPTION_PRIV_INSTRUCTION;
1515 default:
1516 return 0;
1517 }
1518 }
1519
1520
1521 #include "pshpack1.h"
1522 struct atl_thunk
1523 {
1524 DWORD movl; /* movl this,4(%esp) */
1525 DWORD this;
1526 BYTE jmp; /* jmp func */
1527 int func;
1528 };
1529 #include "poppack.h"
1530
1531 /**********************************************************************
1532 * check_atl_thunk
1533 *
1534 * Check if code destination is an ATL thunk, and emulate it if so.
1535 */
1536 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1537 {
1538 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1539 BOOL ret = FALSE;
1540
1541 __TRY
1542 {
1543 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1544 {
1545 *((DWORD *)context->Esp + 1) = thunk->this;
1546 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1547 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1548 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1549 ret = TRUE;
1550 }
1551 }
1552 __EXCEPT_PAGE_FAULT
1553 {
1554 return FALSE;
1555 }
1556 __ENDTRY
1557 return ret;
1558 }
1559
1560
1561 /***********************************************************************
1562 * setup_exception_record
1563 *
1564 * Setup the exception record and context on the thread stack.
1565 */
1566 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1567 WORD fs, WORD gs, raise_func func )
1568 {
1569 struct stack_layout
1570 {
1571 void *ret_addr; /* return address from raise_func */
1572 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1573 CONTEXT *context_ptr; /* second arg for raise_func */
1574 CONTEXT context;
1575 EXCEPTION_RECORD rec;
1576 DWORD ebp;
1577 DWORD eip;
1578 } *stack = stack_ptr;
1579 DWORD exception_code = 0;
1580
1581 /* stack sanity checks */
1582
1583 if ((char *)stack >= (char *)get_signal_stack() &&
1584 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1585 {
1586 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1587 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1588 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1589 NtCurrentTeb()->Tib.StackBase );
1590 abort_thread(1);
1591 }
1592
1593 if (stack - 1 > stack || /* check for overflow in subtraction */
1594 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1595 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1596 {
1597 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1598 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1599 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1600 NtCurrentTeb()->Tib.StackBase );
1601 }
1602 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1603 {
1604 /* stack overflow on last page, unrecoverable */
1605 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1606 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1607 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1608 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1609 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1610 abort_thread(1);
1611 }
1612 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1613 {
1614 /* stack access below stack limit, may be recoverable */
1615 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1616 else
1617 {
1618 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1619 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1620 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1621 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1622 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1623 abort_thread(1);
1624 }
1625 }
1626
1627 stack--; /* push the stack_layout structure */
1628 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1629 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1630 #elif defined(VALGRIND_MAKE_WRITABLE)
1631 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1632 #endif
1633 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1634 stack->rec_ptr = &stack->rec;
1635 stack->context_ptr = &stack->context;
1636
1637 stack->rec.ExceptionRecord = NULL;
1638 stack->rec.ExceptionCode = exception_code;
1639 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1640 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1641 stack->rec.NumberParameters = 0;
1642
1643 save_context( &stack->context, sigcontext, fs, gs );
1644
1645 /* now modify the sigcontext to return to the raise function */
1646 ESP_sig(sigcontext) = (DWORD)stack;
1647 EIP_sig(sigcontext) = (DWORD)func;
1648 /* clear single-step, direction, and align check flag */
1649 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1650 CS_sig(sigcontext) = wine_get_cs();
1651 DS_sig(sigcontext) = wine_get_ds();
1652 ES_sig(sigcontext) = wine_get_es();
1653 FS_sig(sigcontext) = wine_get_fs();
1654 GS_sig(sigcontext) = wine_get_gs();
1655 SS_sig(sigcontext) = wine_get_ss();
1656
1657 return stack->rec_ptr;
1658 }
1659
1660
1661 /***********************************************************************
1662 * setup_exception
1663 *
1664 * Setup a proper stack frame for the raise function, and modify the
1665 * sigcontext so that the return from the signal handler will call
1666 * the raise function.
1667 */
1668 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1669 {
1670 WORD fs, gs;
1671 void *stack = init_handler( sigcontext, &fs, &gs );
1672
1673 return setup_exception_record( sigcontext, stack, fs, gs, func );
1674 }
1675
1676
1677 /***********************************************************************
1678 * get_exception_context
1679 *
1680 * Get a pointer to the context built by setup_exception.
1681 */
1682 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1683 {
1684 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1685 }
1686
1687
1688 /**********************************************************************
1689 * get_fpu_code
1690 *
1691 * Get the FPU exception code from the FPU status.
1692 */
1693 static inline DWORD get_fpu_code( const CONTEXT *context )
1694 {
1695 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1696
1697 if (status & 0x01) /* IE */
1698 {
1699 if (status & 0x40) /* SF */
1700 return EXCEPTION_FLT_STACK_CHECK;
1701 else
1702 return EXCEPTION_FLT_INVALID_OPERATION;
1703 }
1704 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1705 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1706 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1707 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1708 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1709 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1710 }
1711
1712
1713 /**********************************************************************
1714 * raise_segv_exception
1715 */
1716 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1717 {
1718 NTSTATUS status;
1719
1720 switch(rec->ExceptionCode)
1721 {
1722 case EXCEPTION_ACCESS_VIOLATION:
1723 if (rec->NumberParameters == 2)
1724 {
1725 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1726 goto done;
1727 if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1728 rec->ExceptionInformation[0] )))
1729 goto done;
1730 /* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
1731 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
1732 {
1733 ULONG flags;
1734 NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
1735 &flags, sizeof(flags), NULL );
1736 if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
1737 rec->ExceptionInformation[0] = EXCEPTION_READ_FAULT;
1738 }
1739 }
1740 break;
1741 case EXCEPTION_DATATYPE_MISALIGNMENT:
1742 /* FIXME: pass through exception handler first? */
1743 if (context->EFlags & 0x00040000)
1744 {
1745 /* Disable AC flag, return */
1746 context->EFlags &= ~0x00040000;
1747 goto done;
1748 }
1749 break;
1750 }
1751 status = NtRaiseException( rec, context, TRUE );
1752 raise_status( status, rec );
1753 done:
1754 set_cpu_context( context );
1755 }
1756
1757
1758 /**********************************************************************
1759 * raise_trap_exception
1760 */
1761 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1762 {
1763 NTSTATUS status;
1764
1765 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1766 {
1767 /* when single stepping can't tell whether this is a hw bp or a
1768 * single step interrupt. try to avoid as much overhead as possible
1769 * and only do a server call if there is any hw bp enabled. */
1770
1771 if( !(context->EFlags & 0x100) || (ntdll_get_thread_data()->dr7 & 0xff) )
1772 {
1773 /* (possible) hardware breakpoint, fetch the debug registers */
1774 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1775 NtGetContextThread(GetCurrentThread(), context);
1776 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1777 }
1778
1779 context->EFlags &= ~0x100; /* clear single-step flag */
1780 }
1781
1782 status = NtRaiseException( rec, context, TRUE );
1783 raise_status( status, rec );
1784 }
1785
1786
1787 /**********************************************************************
1788 * raise_generic_exception
1789 *
1790 * Generic raise function for exceptions that don't need special treatment.
1791 */
1792 static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1793 {
1794 NTSTATUS status;
1795
1796 status = NtRaiseException( rec, context, TRUE );
1797 raise_status( status, rec );
1798 }
1799
1800
1801 #ifdef __HAVE_VM86
1802 /**********************************************************************
1803 * raise_vm86_sti_exception
1804 */
1805 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1806 {
1807 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1808 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1809
1810 if (ntdll_get_thread_data()->vm86_ptr)
1811 {
1812 if (((char*)context->Eip >= (char*)vm86_return) &&
1813 ((char*)context->Eip <= (char*)vm86_return_end) &&
1814 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1815 /* exiting from VM86, can't throw */
1816 goto done;
1817 }
1818 merge_vm86_pending_flags( rec );
1819 }
1820 else if (get_vm86_teb_info()->dpmi_vif &&
1821 !wine_ldt_is_system(context->SegCs) &&
1822 !wine_ldt_is_system(context->SegSs))
1823 {
1824 /* Executing DPMI code and virtual interrupts are enabled. */
1825 get_vm86_teb_info()->vm86_pending = 0;
1826 NtRaiseException( rec, context, TRUE );
1827 }
1828 done:
1829 set_cpu_context( context );
1830 }
1831
1832
1833 /**********************************************************************
1834 * usr2_handler
1835 *
1836 * Handler for SIGUSR2.
1837 * We use it to signal that the running __wine_enter_vm86() should
1838 * immediately set VIP_FLAG, causing pending events to be handled
1839 * as early as possible.
1840 */
1841 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1842 {
1843 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1844 rec->ExceptionCode = EXCEPTION_VM86_STI;
1845 }
1846 #endif /* __HAVE_VM86 */
1847
1848
1849 /**********************************************************************
1850 * segv_handler
1851 *
1852 * Handler for SIGSEGV and related errors.
1853 */
1854 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1855 {
1856 WORD fs, gs;
1857 EXCEPTION_RECORD *rec;
1858 SIGCONTEXT *context = sigcontext;
1859 void *stack = init_handler( sigcontext, &fs, &gs );
1860
1861 /* check for page fault inside the thread stack */
1862 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1863 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1864 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1865 virtual_handle_stack_fault( siginfo->si_addr ))
1866 {
1867 /* check if this was the last guard page */
1868 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1869 {
1870 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1871 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1872 }
1873 return;
1874 }
1875
1876 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1877 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1878
1879 switch(get_trap_code(context))
1880 {
1881 case TRAP_x86_OFLOW: /* Overflow exception */
1882 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1883 break;
1884 case TRAP_x86_BOUND: /* Bound range exception */
1885 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1886 break;
1887 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1888 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1889 break;
1890 case TRAP_x86_STKFLT: /* Stack fault */
1891 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1892 break;
1893 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1894 case TRAP_x86_PROTFLT: /* General protection fault */
1895 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1896 {
1897 WORD err = get_error_code(context);
1898 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1899 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1900 rec->NumberParameters = 2;
1901 rec->ExceptionInformation[0] = 0;
1902 /* if error contains a LDT selector, use that as fault address */
1903 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1904 rec->ExceptionInformation[1] = err & ~7;
1905 else
1906 rec->ExceptionInformation[1] = 0xffffffff;
1907 }
1908 break;
1909 case TRAP_x86_PAGEFLT: /* Page fault */
1910 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1911 rec->NumberParameters = 2;
1912 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1913 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1914 break;
1915 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1916 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1917 break;
1918 default:
1919 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1920 /* fall through */
1921 case TRAP_x86_NMI: /* NMI interrupt */
1922 case TRAP_x86_DNA: /* Device not available exception */
1923 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1924 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1925 case TRAP_x86_MCHK: /* Machine check exception */
1926 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1927 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1928 break;
1929 }
1930 }
1931
1932
1933 /**********************************************************************
1934 * trap_handler
1935 *
1936 * Handler for SIGTRAP.
1937 */
1938 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1939 {
1940 SIGCONTEXT *context = sigcontext;
1941 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1942
1943 switch(get_trap_code(context))
1944 {
1945 case TRAP_x86_TRCTRAP: /* Single-step exception */
1946 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1947 break;
1948 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1949 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1950 /* fall through */
1951 default:
1952 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1953 break;
1954 }
1955 }
1956
1957
1958 /**********************************************************************
1959 * fpe_handler
1960 *
1961 * Handler for SIGFPE.
1962 */
1963 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1964 {
1965 CONTEXT *win_context;
1966 SIGCONTEXT *context = sigcontext;
1967 EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );
1968
1969 win_context = get_exception_context( rec );
1970
1971 switch(get_trap_code(context))
1972 {
1973 case TRAP_x86_DIVIDE: /* Division by zero exception */
1974 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1975 break;
1976 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1977 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1978 break;
1979 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1980 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1981 rec->ExceptionCode = get_fpu_code( win_context );
1982 rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1983 break;
1984 case TRAP_x86_CACHEFLT: /* SIMD exception */
1985 /* TODO:
1986 * Behaviour only tested for divide-by-zero exceptions
1987 * Check for other SIMD exceptions as well */
1988 if(siginfo->si_code != FPE_FLTDIV)
1989 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1990 siginfo->si_code);
1991
1992 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1993 rec->NumberParameters = 1;
1994 /* no idea what meaning is actually behind this but that's what native does */
1995 rec->ExceptionInformation[0] = 0;
1996 break;
1997 default:
1998 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1999 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
2000 break;
2001 }
2002 }
2003
2004
2005 /**********************************************************************
2006 * int_handler
2007 *
2008 * Handler for SIGINT.
2009 *
2010 * FIXME: should not be calling external functions on the signal stack.
2011 */
2012 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2013 {
2014 WORD fs, gs;
2015 init_handler( sigcontext, &fs, &gs );
2016 if (!dispatch_signal(SIGINT))
2017 {
2018 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
2019 rec->ExceptionCode = CONTROL_C_EXIT;
2020 }
2021 }
2022
2023 /**********************************************************************
2024 * abrt_handler
2025 *
2026 * Handler for SIGABRT.
2027 */
2028 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2029 {
2030 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
2031 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
2032 rec->ExceptionFlags = EH_NONCONTINUABLE;
2033 }
2034
2035
2036 /**********************************************************************
2037 * quit_handler
2038 *
2039 * Handler for SIGQUIT.
2040 */
2041 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2042 {
2043 WORD fs, gs;
2044 init_handler( sigcontext, &fs, &gs );
2045 abort_thread(0);
2046 }
2047
2048
2049 /**********************************************************************
2050 * usr1_handler
2051 *
2052 * Handler for SIGUSR1, used to signal a thread that it got suspended.
2053 */
2054 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
2055 {
2056 CONTEXT context;
2057 WORD fs, gs;
2058
2059 init_handler( sigcontext, &fs, &gs );
2060 save_context( &context, sigcontext, fs, gs );
2061 wait_suspend( &context );
2062 restore_context( &context, sigcontext );
2063 }
2064
2065
2066 /***********************************************************************
2067 * __wine_set_signal_handler (NTDLL.@)
2068 */
2069 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
2070 {
2071 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
2072 if (handlers[sig] != NULL) return -2;
2073 handlers[sig] = wsh;
2074 return 0;
2075 }
2076
2077
2078 /***********************************************************************
2079 * locking for LDT routines
2080 */
2081 static RTL_CRITICAL_SECTION ldt_section;
2082 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
2083 {
2084 0, 0, &ldt_section,
2085 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
2086 0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
2087 };
2088 static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
2089 static sigset_t ldt_sigset;
2090
2091 static void ldt_lock(void)
2092 {
2093 sigset_t sigset;
2094
2095 pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
2096 RtlEnterCriticalSection( &ldt_section );
2097 if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
2098 }
2099
2100 static void ldt_unlock(void)
2101 {
2102 if (ldt_section.RecursionCount == 1)
2103 {
2104 sigset_t sigset = ldt_sigset;
2105 RtlLeaveCriticalSection( &ldt_section );
2106 pthread_sigmask( SIG_SETMASK, &sigset, NULL );
2107 }
2108 else RtlLeaveCriticalSection( &ldt_section );
2109 }
2110
2111
2112 /**********************************************************************
2113 * signal_alloc_thread
2114 */
2115 NTSTATUS signal_alloc_thread( TEB **teb )
2116 {
2117 static size_t sigstack_zero_bits;
2118 struct ntdll_thread_data *thread_data;
2119 struct ntdll_thread_data *parent_data = NULL;
2120 SIZE_T size;
2121 void *addr = NULL;
2122 NTSTATUS status;
2123
2124 if (!sigstack_zero_bits)
2125 {
2126 size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
2127 /* find the first power of two not smaller than min_size */
2128 sigstack_zero_bits = 12;
2129 while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
2130 signal_stack_mask = (1 << sigstack_zero_bits) - 1;
2131 signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
2132 }
2133 else parent_data = ntdll_get_thread_data();
2134
2135 size = signal_stack_mask + 1;
2136 if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
2137 &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
2138 {
2139 *teb = addr;
2140 (*teb)->Tib.Self = &(*teb)->Tib;
2141 (*teb)->Tib.ExceptionList = (void *)~0UL;
2142 thread_data = (struct ntdll_thread_data *)(*teb)->SpareBytes1;
2143 if (!(thread_data->fs = wine_ldt_alloc_fs()))
2144 {
2145 size = 0;
2146 NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
2147 status = STATUS_TOO_MANY_THREADS;
2148 }
2149 if (parent_data)
2150 {
2151 /* inherit debug registers from parent thread */
2152 thread_data->dr0 = parent_data->dr0;
2153 thread_data->dr1 = parent_data->dr1;
2154 thread_data->dr2 = parent_data->dr2;
2155 thread_data->dr3 = parent_data->dr3;
2156 thread_data->dr6 = parent_data->dr6;
2157 thread_data->dr7 = parent_data->dr7;
2158 }
2159
2160 }
2161 return status;
2162 }
2163
2164
2165 /**********************************************************************
2166 * signal_free_thread
2167 */
2168 void signal_free_thread( TEB *teb )
2169 {
2170 SIZE_T size;
2171 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2172
2173 if (thread_data) wine_ldt_free_fs( thread_data->fs );
2174 if (teb->DeallocationStack)
2175 {
2176 size = 0;
2177 NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
2178 }
2179 size = 0;
2180 NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
2181 }
2182
2183
2184 /**********************************************************************
2185 * signal_init_thread
2186 */
2187 void signal_init_thread( TEB *teb )
2188 {
2189 const WORD fpu_cw = 0x27f;
2190 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
2191 LDT_ENTRY fs_entry;
2192 stack_t ss;
2193
2194 #ifdef __APPLE__
2195 int mib[2], val = 1;
2196
2197 mib[0] = CTL_KERN;
2198 mib[1] = KERN_THALTSTACK;
2199 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
2200 #endif
2201
2202 ss.ss_sp = (char *)teb + teb_size;
2203 ss.ss_size = signal_stack_size;
2204 ss.ss_flags = 0;
2205 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
2206
2207 wine_ldt_set_base( &fs_entry, teb );
2208 wine_ldt_set_limit( &fs_entry, teb_size - 1 );
2209 wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
2210 wine_ldt_init_fs( thread_data->fs, &fs_entry );
2211 thread_data->gs = wine_get_gs();
2212
2213 #ifdef __GNUC__
2214 __asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
2215 #else
2216 FIXME("FPU setup not implemented for this platform.\n");
2217 #endif
2218 }
2219
2220 /**********************************************************************
2221 * signal_init_process
2222 */
2223 void signal_init_process(void)
2224 {
2225 struct sigaction sig_act;
2226
2227 sig_act.sa_mask = server_block_set;
2228 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
2229 #ifdef SA_ONSTACK
2230 sig_act.sa_flags |= SA_ONSTACK;
2231 #endif
2232
2233 sig_act.sa_sigaction = int_handler;
2234 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
2235 sig_act.sa_sigaction = fpe_handler;
2236 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
2237 sig_act.sa_sigaction = abrt_handler;
2238 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
2239 sig_act.sa_sigaction = quit_handler;
2240 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
2241 sig_act.sa_sigaction = usr1_handler;
2242 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
2243
2244 sig_act.sa_sigaction = segv_handler;
2245 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
2246 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
2247 #ifdef SIGBUS
2248 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
2249 #endif
2250
2251 #ifdef SIGTRAP
2252 sig_act.sa_sigaction = trap_handler;
2253 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
2254 #endif
2255
2256 #ifdef __HAVE_VM86
2257 sig_act.sa_sigaction = usr2_handler;
2258 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
2259 #endif
2260
2261 wine_ldt_init_locking( ldt_lock, ldt_unlock );
2262 return;
2263
2264 error:
2265 perror("sigaction");
2266 exit(1);
2267 }
2268
2269
2270 #ifdef __HAVE_VM86
2271 /**********************************************************************
2272 * __wine_enter_vm86 (NTDLL.@)
2273 *
2274 * Enter vm86 mode with the specified register context.
2275 */
2276 void __wine_enter_vm86( CONTEXT *context )
2277 {
2278 EXCEPTION_RECORD rec;
2279 int res;
2280 struct vm86plus_struct vm86;
2281
2282 memset( &vm86, 0, sizeof(vm86) );
2283 for (;;)
2284 {
2285 restore_vm86_context( context, &vm86 );
2286
2287 ntdll_get_thread_data()->vm86_ptr = &vm86;
2288 merge_vm86_pending_flags( &rec );
2289
2290 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
2291 if (res < 0)
2292 {
2293 errno = -res;
2294 return;
2295 }
2296
2297 save_vm86_context( context, &vm86 );
2298
2299 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
2300 rec.ExceptionRecord = NULL;
2301 rec.ExceptionAddress = (LPVOID)context->Eip;
2302 rec.NumberParameters = 0;
2303
2304 switch(VM86_TYPE(res))
2305 {
2306 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
2307 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
2308 break;
2309 case VM86_TRAP: /* return due to DOS-debugger request */
2310 switch(VM86_ARG(res))
2311 {
2312 case TRAP_x86_TRCTRAP: /* Single-step exception */
2313 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
2314 break;
2315 case TRAP_x86_BPTFLT: /* Breakpoint exception */
2316 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
2317 /* fall through */
2318 default:
2319 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
2320 break;
2321 }
2322 break;
2323 case VM86_INTx: /* int3/int x instruction (ARG = x) */
2324 rec.ExceptionCode = EXCEPTION_VM86_INTx;
2325 rec.NumberParameters = 1;
2326 rec.ExceptionInformation[0] = VM86_ARG(res);
2327 break;
2328 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
2329 context->EFlags |= VIF_FLAG;
2330 context->EFlags &= ~VIP_FLAG;
2331 get_vm86_teb_info()->vm86_pending = 0;
2332 rec.ExceptionCode = EXCEPTION_VM86_STI;
2333 break;
2334 case VM86_PICRETURN: /* return due to pending PIC request */
2335 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
2336 break;
2337 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
2338 default:
2339 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
2340 continue;
2341 }
2342 raise_exception( &rec, context, TRUE );
2343 }
2344 }
2345
2346 #else /* __HAVE_VM86 */
2347 /**********************************************************************
2348 * __wine_enter_vm86 (NTDLL.@)
2349 */
2350 void __wine_enter_vm86( CONTEXT *context )
2351 {
2352 MESSAGE("vm86 mode not supported on this platform\n");
2353 }
2354 #endif /* __HAVE_VM86 */
2355
2356
2357 /*******************************************************************
2358 * RtlUnwind (NTDLL.@)
2359 */
2360 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
2361 PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
2362 {
2363 EXCEPTION_RECORD record;
2364 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
2365 DWORD res;
2366
2367 context->Eax = (DWORD)retval;
2368
2369 /* build an exception record, if we do not have one */
2370 if (!pRecord)
2371 {
2372 record.ExceptionCode = STATUS_UNWIND;
2373 record.ExceptionFlags = 0;
2374 record.ExceptionRecord = NULL;
2375 record.ExceptionAddress = (void *)context->Eip;
2376 record.NumberParameters = 0;
2377 pRecord = &record;
2378 }
2379
2380 pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
2381
2382 TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
2383
2384 /* get chain of exception frames */
2385 frame = NtCurrentTeb()->Tib.ExceptionList;
2386 while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
2387 {
2388 /* Check frame address */
2389 if (pEndFrame && (frame > pEndFrame))
2390 raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );
2391
2392 if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );
2393
2394 /* Call handler */
2395 TRACE( "calling handler at %p code=%x flags=%x\n",
2396 frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
2397 res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
2398 TRACE( "handler at %p returned %x\n", frame->Handler, res );
2399
2400 switch(res)
2401 {
2402 case ExceptionContinueSearch:
2403 break;
2404 case ExceptionCollidedUnwind:
2405 frame = dispatch;
2406 break;
2407 default:
2408 raise_status( STATUS_INVALID_DISPOSITION, pRecord );
2409 break;
2410 }
2411 frame = __wine_pop_frame( frame );
2412 }
2413 }
2414 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 4 )
2415
2416
2417 /*******************************************************************
2418 * NtRaiseException (NTDLL.@)
2419 */
2420 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
2421 {
2422 NTSTATUS status = raise_exception( rec, context, first_chance );
2423 if (status == STATUS_SUCCESS)
2424 {
2425 set_debug_registers( context );
2426 set_cpu_context( context );
2427 }
2428 return status;
2429 }
2430
2431
2432 /***********************************************************************
2433 * RtlRaiseException (NTDLL.@)
2434 */
2435 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
2436 {
2437 NTSTATUS status;
2438
2439 rec->ExceptionAddress = (void *)context->Eip;
2440 status = raise_exception( rec, context, TRUE );
2441 if (status != STATUS_SUCCESS) raise_status( status, rec );
2442 }
2443 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )
2444
2445
2446 /*************************************************************************
2447 * RtlCaptureStackBackTrace (NTDLL.@)
2448 */
2449 USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
2450 {
2451 CONTEXT context;
2452 ULONG i;
2453 ULONG *frame;
2454
2455 RtlCaptureContext( &context );
2456 if (hash) *hash = 0;
2457 frame = (ULONG *)context.Ebp;
2458
2459 while (skip--)
2460 {
2461 if (!is_valid_frame( frame )) return 0;
2462 frame = (ULONG *)*frame;
2463 }
2464
2465 for (i = 0; i < count; i++)
2466 {
2467 if (!is_valid_frame( frame )) break;
2468 buffer[i] = (void *)frame[1];
2469 if (hash) *hash += frame[1];
2470 frame = (ULONG *)*frame;
2471 }
2472 return i;
2473 }
2474
2475
2476 extern void DECLSPEC_NORETURN call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg );
2477 __ASM_GLOBAL_FUNC( call_thread_entry_point,
2478 "pushl %ebp\n\t"
2479 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2480 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2481 "movl %esp,%ebp\n\t"
2482 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2483 "pushl %ebx\n\t"
2484 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2485 "pushl %esi\n\t"
2486 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2487 "pushl %edi\n\t"
2488 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2489 "pushl %ebp\n\t"
2490 "pushl 12(%ebp)\n\t"
2491 "pushl 8(%ebp)\n\t"
2492 "call " __ASM_NAME("call_thread_func") );
2493
2494 extern void DECLSPEC_NORETURN call_thread_exit_func( int status, void (*func)(int), void *frame );
2495 __ASM_GLOBAL_FUNC( call_thread_exit_func,
2496 "movl 4(%esp),%eax\n\t"
2497 "movl 8(%esp),%ecx\n\t"
2498 "movl 12(%esp),%ebp\n\t"
2499 __ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
2500 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2501 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2502 __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
2503 __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
2504 "leal -20(%ebp),%esp\n\t"
2505 "pushl %eax\n\t"
2506 "call *%ecx" );
2507
2508 /* wrapper for apps that don't declare the thread function correctly */
2509 extern void DECLSPEC_NORETURN call_thread_func_wrapper( LPTHREAD_START_ROUTINE entry, void *arg );
2510 __ASM_GLOBAL_FUNC(call_thread_func_wrapper,
2511 "pushl %ebp\n\t"
2512 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2513 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2514 "movl %esp,%ebp\n\t"
2515 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2516 "subl $4,%esp\n\t"
2517 "pushl 12(%ebp)\n\t"
2518 "call *8(%ebp)\n\t"
2519 "leal -4(%ebp),%esp\n\t"
2520 "pushl %eax\n\t"
2521 "call " __ASM_NAME("exit_thread") "\n\t"
2522 "int $3" )
2523
2524 /***********************************************************************
2525 * call_thread_func
2526 */
2527 void call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg, void *frame )
2528 {
2529 ntdll_get_thread_data()->exit_frame = frame;
2530 __TRY
2531 {
2532 call_thread_func_wrapper( entry, arg );
2533 }
2534 __EXCEPT(unhandled_exception_filter)
2535 {
2536 NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
2537 }
2538 __ENDTRY
2539 abort(); /* should not be reached */
2540 }
2541
2542 /***********************************************************************
2543 * RtlExitUserThread (NTDLL.@)
2544 */
2545 void WINAPI RtlExitUserThread( ULONG status )
2546 {
2547 if (!ntdll_get_thread_data()->exit_frame) exit_thread( status );
2548 call_thread_exit_func( status, exit_thread, ntdll_get_thread_data()->exit_frame );
2549 }
2550
2551 /***********************************************************************
2552 * abort_thread
2553 */
2554 void abort_thread( int status )
2555 {
2556 if (!ntdll_get_thread_data()->exit_frame) terminate_thread( status );
2557 call_thread_exit_func( status, terminate_thread, ntdll_get_thread_data()->exit_frame );
2558 }
2559
2560 /**********************************************************************
2561 * DbgBreakPoint (NTDLL.@)
2562 */
2563 __ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")
2564
2565 /**********************************************************************
2566 * DbgUserBreakPoint (NTDLL.@)
2567 */
2568 __ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")
2569
2570 /**********************************************************************
2571 * NtCurrentTeb (NTDLL.@)
2572 */
2573 __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
2574
2575
2576 /**************************************************************************
2577 * _chkstk (NTDLL.@)
2578 */
2579 __ASM_STDCALL_FUNC( _chkstk, 0,
2580 "negl %eax\n\t"
2581 "addl %esp,%eax\n\t"
2582 "xchgl %esp,%eax\n\t"
2583 "movl 0(%eax),%eax\n\t" /* copy return address from old location */
2584 "movl %eax,0(%esp)\n\t"
2585 "ret" )
2586
2587 /**************************************************************************
2588 * _alloca_probe (NTDLL.@)
2589 */
2590 __ASM_STDCALL_FUNC( _alloca_probe, 0,
2591 "negl %eax\n\t"
2592 "addl %esp,%eax\n\t"
2593 "xchgl %esp,%eax\n\t"
2594 "movl 0(%eax),%eax\n\t" /* copy return address from old location */
2595 "movl %eax,0(%esp)\n\t"
2596 "ret" )
2597
2598
2599 /**********************************************************************
2600 * EXC_CallHandler (internal)
2601 *
2602 * Some exception handlers depend on EBP to have a fixed position relative to
2603 * the exception frame.
2604 * Shrinker depends on (*1) doing what it does,
2605 * (*2) being the exact instruction it is and (*3) beginning with 0x64
2606 * (i.e. the %fs prefix to the movl instruction). It also depends on the
2607 * function calling the handler having only 5 parameters (*4).
2608 */
2609 __ASM_GLOBAL_FUNC( EXC_CallHandler,
2610 "pushl %ebp\n\t"
2611 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2612 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2613 "movl %esp,%ebp\n\t"
2614 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2615 "pushl %ebx\n\t"
2616 __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
2617 "movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
2618 "pushl 24(%ebp)\n\t"
2619 "pushl 20(%ebp)\n\t"
2620 "pushl 16(%ebp)\n\t"
2621 "pushl 12(%ebp)\n\t"
2622 "pushl 8(%ebp)\n\t"
2623 "call " __ASM_NAME("call_exception_handler") "\n\t"
2624 "popl %ebx\n\t"
2625 __ASM_CFI(".cfi_same_value %ebx\n\t")
2626 "leave\n"
2627 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2628 __ASM_CFI(".cfi_same_value %ebp\n\t")
2629 "ret" )
2630 __ASM_GLOBAL_FUNC(call_exception_handler,
2631 "pushl %ebp\n\t"
2632 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
2633 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
2634 "movl %esp,%ebp\n\t"
2635 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
2636 "subl $12,%esp\n\t"
2637 "pushl 12(%ebp)\n\t" /* make any exceptions in this... */
2638 "pushl %edx\n\t" /* handler be handled by... */
2639 ".byte 0x64\n\t"
2640 "pushl (0)\n\t" /* nested_handler (passed in edx). */
2641 ".byte 0x64\n\t"
2642 "movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */
2643 "pushl 20(%ebp)\n\t"
2644 "pushl 16(%ebp)\n\t"
2645 "pushl 12(%ebp)\n\t"
2646 "pushl 8(%ebp)\n\t"
2647 "movl 24(%ebp), %ecx\n\t" /* (*1) */
2648 "call *%ecx\n\t" /* call handler. (*2) */
2649 ".byte 0x64\n\t"
2650 "movl (0), %esp\n\t" /* restore previous... (*3) */
2651 ".byte 0x64\n\t"
2652 "popl (0)\n\t" /* exception frame. */
2653 "movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */
2654 "popl %ebp\n\t"
2655 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
2656 __ASM_CFI(".cfi_same_value %ebp\n\t")
2657 "ret $20" ) /* (*4) */
2658
2659 #endif /* __i386__ */
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