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push 2f3ca95c4974ba229fa47d638b3044f50788f3bd
[wine/hacks.git] / dlls / ntdll / signal_i386.c
blobffa60adf738b6fb23af1d8fb85ad25b7bcd160c4
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 "windef.h"
59 #include "wine/library.h"
60 #include "ntdll_misc.h"
61 #include "wine/exception.h"
62 #include "wine/debug.h"
63
64 #ifdef HAVE_VALGRIND_MEMCHECK_H
65 #include <valgrind/memcheck.h>
66 #endif
67
68 #undef ERR /* Solaris needs to define this */
69
70 /* not defined for x86, so copy the x86_64 definition */
71 typedef struct DECLSPEC_ALIGN(16) _M128A
72 {
73 ULONGLONG Low;
74 LONGLONG High;
75 } M128A;
76
77 typedef struct
78 {
79 WORD ControlWord;
80 WORD StatusWord;
81 BYTE TagWord;
82 BYTE Reserved1;
83 WORD ErrorOpcode;
84 DWORD ErrorOffset;
85 WORD ErrorSelector;
86 WORD Reserved2;
87 DWORD DataOffset;
88 WORD DataSelector;
89 WORD Reserved3;
90 DWORD MxCsr;
91 DWORD MxCsr_Mask;
92 M128A FloatRegisters[8];
93 M128A XmmRegisters[16];
94 BYTE Reserved4[96];
95 } XMM_SAVE_AREA32;
96
97 /***********************************************************************
98 * signal context platform-specific definitions
99 */
100
101 #ifdef linux
102
103 typedef ucontext_t SIGCONTEXT;
104
105 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
106 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
107 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
108 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
109 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
110 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
111 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
112 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
113
114 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
115 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
116 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
117 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
118 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
119 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
120
121 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
122 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
123 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
124 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
125
126 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
127 #define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)
128
129 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
130 #define VIF_FLAG 0x00080000
131 #define VIP_FLAG 0x00100000
132
133 int vm86_enter( void **vm86_ptr );
134 void vm86_return(void);
135 void vm86_return_end(void);
136 __ASM_GLOBAL_FUNC(vm86_enter,
137 "pushl %ebp\n\t"
138 "movl %esp, %ebp\n\t"
139 "movl $166,%eax\n\t" /*SYS_vm86*/
140 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
141 "movl (%ecx),%ecx\n\t"
142 "pushl %ebx\n\t"
143 "movl $1,%ebx\n\t" /*VM86_ENTER*/
144 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
145 "pushl %fs\n\t"
146 "pushl %gs\n\t"
147 "int $0x80\n"
148 ".globl " __ASM_NAME("vm86_return") "\n\t"
149 __ASM_FUNC("vm86_return") "\n"
150 __ASM_NAME("vm86_return") ":\n\t"
151 "popl %gs\n\t"
152 "popl %fs\n\t"
153 "popl %ecx\n\t"
154 "popl %ebx\n\t"
155 "popl %ebp\n\t"
156 "testl %eax,%eax\n\t"
157 "jl 0f\n\t"
158 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
159 "je " __ASM_NAME("vm86_enter") "\n\t"
160 "0:\n\t"
161 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
162 "movl $0,(%ecx)\n\t"
163 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
164 __ASM_FUNC("vm86_return_end") "\n"
165 __ASM_NAME("vm86_return_end") ":\n\t"
166 "ret" )
167
168 #ifdef HAVE_SYS_VM86_H
169 # define __HAVE_VM86
170 #endif
171
172 #endif /* linux */
173
174 #ifdef BSDI
175
176 #include <machine/frame.h>
177 typedef struct trapframe SIGCONTEXT;
178
179 #define EAX_sig(context) ((context)->tf_eax)
180 #define EBX_sig(context) ((context)->tf_ebx)
181 #define ECX_sig(context) ((context)->tf_ecx)
182 #define EDX_sig(context) ((context)->tf_edx)
183 #define ESI_sig(context) ((context)->tf_esi)
184 #define EDI_sig(context) ((context)->tf_edi)
185 #define EBP_sig(context) ((context)->tf_ebp)
186
187 #define CS_sig(context) ((context)->tf_cs)
188 #define DS_sig(context) ((context)->tf_ds)
189 #define ES_sig(context) ((context)->tf_es)
190 #define SS_sig(context) ((context)->tf_ss)
191
192 #define EFL_sig(context) ((context)->tf_eflags)
193
194 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
195 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
196
197 #define FPU_sig(context) NULL /* FIXME */
198 #define FPUX_sig(context) NULL /* FIXME */
199
200 #endif /* bsdi */
201
202 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
203
204 typedef struct sigcontext SIGCONTEXT;
205
206 #define EAX_sig(context) ((context)->sc_eax)
207 #define EBX_sig(context) ((context)->sc_ebx)
208 #define ECX_sig(context) ((context)->sc_ecx)
209 #define EDX_sig(context) ((context)->sc_edx)
210 #define ESI_sig(context) ((context)->sc_esi)
211 #define EDI_sig(context) ((context)->sc_edi)
212 #define EBP_sig(context) ((context)->sc_ebp)
213
214 #define CS_sig(context) ((context)->sc_cs)
215 #define DS_sig(context) ((context)->sc_ds)
216 #define ES_sig(context) ((context)->sc_es)
217 #define FS_sig(context) ((context)->sc_fs)
218 #define GS_sig(context) ((context)->sc_gs)
219 #define SS_sig(context) ((context)->sc_ss)
220
221 #define TRAP_sig(context) ((context)->sc_trapno)
222 #define ERROR_sig(context) ((context)->sc_err)
223 #define EFL_sig(context) ((context)->sc_eflags)
224
225 #define EIP_sig(context) ((context)->sc_eip)
226 #define ESP_sig(context) ((context)->sc_esp)
227
228 #define FPU_sig(context) NULL /* FIXME */
229 #define FPUX_sig(context) NULL /* FIXME */
230
231 #endif /* *BSD */
232
233 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
234
235 #ifdef _SCO_DS
236 #include <sys/regset.h>
237 #endif
238 #include <sys/ucontext.h>
239 typedef struct ucontext SIGCONTEXT;
240
241 #ifdef _SCO_DS
242 #define gregs regs
243 #endif
244
245 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
246 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
247 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
248 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
249 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
250 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
251 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
252
253 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
254 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
255 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
256 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
257
258 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
259 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
260
261 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
262
263 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
264 #ifdef UESP
265 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
266 #elif defined(R_ESP)
267 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
268 #else
269 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
270 #endif
271 #ifdef ERR
272 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
273 #endif
274 #ifdef TRAPNO
275 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
276 #endif
277
278 #define FPU_sig(context) NULL /* FIXME */
279 #define FPUX_sig(context) NULL /* FIXME */
280
281 #endif /* svr4 || SCO_DS */
282
283 #ifdef __APPLE__
284 # include <sys/ucontext.h>
285
286 typedef ucontext_t SIGCONTEXT;
287
288 /* work around silly renaming of struct members in OS X 10.5 */
289 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
290 #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax)
291 #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx)
292 #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx)
293 #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx)
294 #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi)
295 #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi)
296 #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp)
297 #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs)
298 #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds)
299 #define ES_sig(context) ((context)->uc_mcontext->__ss.__es)
300 #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs)
301 #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs)
302 #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss)
303 #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags)
304 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
305 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
306 #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno)
307 #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err)
308 #define FPU_sig(context) NULL
309 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
310 #else
311 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
312 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
313 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
314 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
315 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
316 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
317 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
318 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
319 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
320 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
321 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
322 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
323 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
324 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
325 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
326 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
327 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
328 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
329 #define FPU_sig(context) NULL
330 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
331 #endif
332
333 #endif /* __APPLE__ */
334
335 #if defined(__NetBSD__)
336 # include <sys/ucontext.h>
337 # include <sys/types.h>
338 # include <signal.h>
339
340 typedef ucontext_t SIGCONTEXT;
341
342 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
343 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
344 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
345 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
346 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
347 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
348 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
349 #define ESP_sig(context) _UC_MACHINE_SP(context)
350
351 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
352 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
353 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
354 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
355 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
356 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
357
358 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
359 #define EIP_sig(context) _UC_MACHINE_PC(context)
360 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
361 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
362
363 #define FPU_sig(context) NULL
364 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
365
366 #define T_MCHK T_MCA
367 #define T_XMMFLT T_XMM
368
369 #endif /* __NetBSD__ */
370
371 WINE_DEFAULT_DEBUG_CHANNEL(seh);
372
373 typedef int (*wine_signal_handler)(unsigned int sig);
374
375 static size_t signal_stack_mask;
376 static size_t signal_stack_size;
377
378 static wine_signal_handler handlers[256];
379
380 static int fpux_support; /* whether the CPU support extended fpu context */
381
382 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
383
384 enum i386_trap_code
385 {
386 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
387 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
388 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
389 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
390 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
391 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
392 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
393 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
394 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
395 TRAP_x86_DNA = T_DNA, /* Device not available exception */
396 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
397 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
398 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
399 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
400 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
401 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
402 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
403 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
404 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
405 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
406 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
407 #else
408 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
409 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
410 TRAP_x86_NMI = 2, /* NMI interrupt */
411 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
412 TRAP_x86_OFLOW = 4, /* Overflow exception */
413 TRAP_x86_BOUND = 5, /* Bound range exception */
414 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
415 TRAP_x86_DNA = 7, /* Device not available exception */
416 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
417 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
418 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
419 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
420 TRAP_x86_STKFLT = 12, /* Stack fault */
421 TRAP_x86_PROTFLT = 13, /* General protection fault */
422 TRAP_x86_PAGEFLT = 14, /* Page fault */
423 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
424 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
425 TRAP_x86_MCHK = 18, /* Machine check exception */
426 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
427 otherwise Cache flush exception (via SIGSEV) */
428 #endif
429 };
430
431
432 /***********************************************************************
433 * dispatch_signal
434 */
435 static inline int dispatch_signal(unsigned int sig)
436 {
437 if (handlers[sig] == NULL) return 0;
438 return handlers[sig](sig);
439 }
440
441
442 /***********************************************************************
443 * get_trap_code
444 *
445 * Get the trap code for a signal.
446 */
447 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
448 {
449 #ifdef TRAP_sig
450 return TRAP_sig(sigcontext);
451 #else
452 return TRAP_x86_UNKNOWN; /* unknown trap code */
453 #endif
454 }
455
456 /***********************************************************************
457 * get_error_code
458 *
459 * Get the error code for a signal.
460 */
461 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
462 {
463 #ifdef ERROR_sig
464 return ERROR_sig(sigcontext);
465 #else
466 return 0;
467 #endif
468 }
469
470 /***********************************************************************
471 * get_signal_stack
472 *
473 * Get the base of the signal stack for the current thread.
474 */
475 static inline void *get_signal_stack(void)
476 {
477 return (char *)NtCurrentTeb() + 4096;
478 }
479
480
481 /***********************************************************************
482 * get_current_teb
483 *
484 * Get the current teb based on the stack pointer.
485 */
486 static inline TEB *get_current_teb(void)
487 {
488 unsigned long esp;
489 __asm__("movl %%esp,%0" : "=g" (esp) );
490 return (TEB *)(esp & ~signal_stack_mask);
491 }
492
493
494 #ifdef __HAVE_VM86
495 /***********************************************************************
496 * save_vm86_context
497 *
498 * Set the register values from a vm86 structure.
499 */
500 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
501 {
502 context->ContextFlags = CONTEXT_FULL;
503 context->Eax = vm86->regs.eax;
504 context->Ebx = vm86->regs.ebx;
505 context->Ecx = vm86->regs.ecx;
506 context->Edx = vm86->regs.edx;
507 context->Esi = vm86->regs.esi;
508 context->Edi = vm86->regs.edi;
509 context->Esp = vm86->regs.esp;
510 context->Ebp = vm86->regs.ebp;
511 context->Eip = vm86->regs.eip;
512 context->SegCs = vm86->regs.cs;
513 context->SegDs = vm86->regs.ds;
514 context->SegEs = vm86->regs.es;
515 context->SegFs = vm86->regs.fs;
516 context->SegGs = vm86->regs.gs;
517 context->SegSs = vm86->regs.ss;
518 context->EFlags = vm86->regs.eflags;
519 }
520
521
522 /***********************************************************************
523 * restore_vm86_context
524 *
525 * Build a vm86 structure from the register values.
526 */
527 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
528 {
529 vm86->regs.eax = context->Eax;
530 vm86->regs.ebx = context->Ebx;
531 vm86->regs.ecx = context->Ecx;
532 vm86->regs.edx = context->Edx;
533 vm86->regs.esi = context->Esi;
534 vm86->regs.edi = context->Edi;
535 vm86->regs.esp = context->Esp;
536 vm86->regs.ebp = context->Ebp;
537 vm86->regs.eip = context->Eip;
538 vm86->regs.cs = context->SegCs;
539 vm86->regs.ds = context->SegDs;
540 vm86->regs.es = context->SegEs;
541 vm86->regs.fs = context->SegFs;
542 vm86->regs.gs = context->SegGs;
543 vm86->regs.ss = context->SegSs;
544 vm86->regs.eflags = context->EFlags;
545 }
546
547
548 /**********************************************************************
549 * merge_vm86_pending_flags
550 *
551 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
552 * raises exception if there are pending events and VIF flag
553 * has been turned on.
554 *
555 * Called from __wine_enter_vm86 because vm86_enter
556 * doesn't check for pending events.
557 *
558 * Called from raise_vm86_sti_exception to check for
559 * pending events in a signal safe way.
560 */
561 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
562 {
563 BOOL check_pending = TRUE;
564 struct vm86plus_struct *vm86 =
565 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
566
567 /*
568 * In order to prevent a race when SIGUSR2 occurs while
569 * we are returning from exception handler, pending events
570 * will be rechecked after each raised exception.
571 */
572 while (check_pending && get_vm86_teb_info()->vm86_pending)
573 {
574 check_pending = FALSE;
575 ntdll_get_thread_data()->vm86_ptr = NULL;
576
577 /*
578 * If VIF is set, throw exception.
579 * Note that SIGUSR2 may turn VIF flag off so
580 * VIF check must occur only when TEB.vm86_ptr is NULL.
581 */
582 if (vm86->regs.eflags & VIF_FLAG)
583 {
584 CONTEXT vcontext;
585 save_vm86_context( &vcontext, vm86 );
586
587 rec->ExceptionCode = EXCEPTION_VM86_STI;
588 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
589 rec->ExceptionRecord = NULL;
590 rec->NumberParameters = 0;
591 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
592
593 vcontext.EFlags &= ~VIP_FLAG;
594 get_vm86_teb_info()->vm86_pending = 0;
595 __regs_RtlRaiseException( rec, &vcontext );
596
597 restore_vm86_context( &vcontext, vm86 );
598 check_pending = TRUE;
599 }
600
601 ntdll_get_thread_data()->vm86_ptr = vm86;
602 }
603
604 /*
605 * Merge VIP flags in a signal safe way. This requires
606 * that the following operation compiles into atomic
607 * instruction.
608 */
609 vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
610 }
611 #endif /* __HAVE_VM86 */
612
613
614 #ifdef __sun
615
616 /* We have to workaround two Solaris breakages:
617 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
618 * code crash badly.
619 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
620 * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
621 */
622
623 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
624 __ASM_GLOBAL_FUNC( sigaction_syscall,
625 "movl $0x62,%eax\n\t"
626 "int $0x91\n\t"
627 "ret" )
628
629 /* assume the same libc handler is used for all signals */
630 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
631
632 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
633 {
634 struct ntdll_thread_data *thread_data;
635
636 __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
637
638 thread_data = get_current_teb()->SystemReserved2;
639 wine_set_fs( thread_data->fs );
640 wine_set_gs( thread_data->gs );
641
642 libc_sigacthandler( signal, siginfo, sigcontext );
643 }
644
645 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
646 {
647 struct sigaction real_act;
648
649 if (sigaction( sig, new, old ) == -1) return -1;
650
651 /* retrieve the real handler and flags with a direct syscall */
652 sigaction_syscall( sig, NULL, &real_act );
653 libc_sigacthandler = real_act.sa_sigaction;
654 real_act.sa_sigaction = wine_sigacthandler;
655 sigaction_syscall( sig, &real_act, NULL );
656 return 0;
657 }
658 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
659
660 #endif
661
662 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
663
664
665 /***********************************************************************
666 * init_handler
667 *
668 * Handler initialization when the full context is not needed.
669 * Return the stack pointer to use for pushing the exception data.
670 */
671 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
672 {
673 TEB *teb = get_current_teb();
674 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
675
676 /* get %fs and %gs at time of the fault */
677 #ifdef FS_sig
678 *fs = LOWORD(FS_sig(sigcontext));
679 #else
680 *fs = wine_get_fs();
681 #endif
682 #ifdef GS_sig
683 *gs = LOWORD(GS_sig(sigcontext));
684 #else
685 *gs = wine_get_gs();
686 #endif
687
688 #ifndef __sun /* see above for Solaris handling */
689 wine_set_fs( thread_data->fs );
690 wine_set_gs( thread_data->gs );
691 #endif
692
693 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
694 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
695 {
696 /*
697 * Win16 or DOS protected mode. Note that during switch
698 * from 16-bit mode to linear mode, CS may be set to system
699 * segment before FS is restored. Fortunately, in this case
700 * SS is still non-system segment. This is why both CS and SS
701 * are checked.
702 */
703 return teb->WOW32Reserved;
704 }
705 return (void *)(ESP_sig(sigcontext) & ~3);
706 }
707
708
709 /***********************************************************************
710 * save_fpu
711 *
712 * Save the thread FPU context.
713 */
714 static inline void save_fpu( CONTEXT *context )
715 {
716 #ifdef __GNUC__
717 context->ContextFlags |= CONTEXT_FLOATING_POINT;
718 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
719 #endif
720 }
721
722
723 /***********************************************************************
724 * save_fpux
725 *
726 * Save the thread FPU extended context.
727 */
728 static inline void save_fpux( CONTEXT *context )
729 {
730 #ifdef __GNUC__
731 /* we have to enforce alignment by hand */
732 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
733 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
734
735 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
736 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
737 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
738 #endif
739 }
740
741
742 /***********************************************************************
743 * restore_fpu
744 *
745 * Restore the FPU context to a sigcontext.
746 */
747 static inline void restore_fpu( const CONTEXT *context )
748 {
749 FLOATING_SAVE_AREA float_status = context->FloatSave;
750 /* reset the current interrupt status */
751 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
752 #ifdef __GNUC__
753 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
754 #endif /* __GNUC__ */
755 }
756
757
758 /***********************************************************************
759 * restore_fpux
760 *
761 * Restore the FPU extended context to a sigcontext.
762 */
763 static inline void restore_fpux( const CONTEXT *context )
764 {
765 #ifdef __GNUC__
766 /* we have to enforce alignment by hand */
767 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
768 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
769
770 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
771 /* reset the current interrupt status */
772 state->StatusWord &= state->ControlWord | 0xff80;
773 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
774 #endif
775 }
776
777
778 /***********************************************************************
779 * fpux_to_fpu
780 *
781 * Build a standard FPU context from an extended one.
782 */
783 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
784 {
785 unsigned int i, tag, stack_top;
786
787 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
788 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
789 fpu->ErrorOffset = fpux->ErrorOffset;
790 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
791 fpu->DataOffset = fpux->DataOffset;
792 fpu->DataSelector = fpux->DataSelector;
793 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
794
795 stack_top = (fpux->StatusWord >> 11) & 7;
796 fpu->TagWord = 0xffff0000;
797 for (i = 0; i < 8; i++)
798 {
799 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
800 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
801 else
802 {
803 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
804 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
805 {
806 tag = 2; /* special */
807 }
808 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
809 {
810 if (reg->Low) tag = 2; /* special */
811 else tag = 1; /* zero */
812 }
813 else
814 {
815 if (reg->Low >> 63) tag = 0; /* valid */
816 else tag = 2; /* special */
817 }
818 }
819 fpu->TagWord |= tag << (2 * i);
820 }
821 }
822
823
824 /***********************************************************************
825 * save_context
826 *
827 * Build a context structure from the signal info.
828 */
829 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
830 {
831 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
832 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
833 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
834
835 memset(context, 0, sizeof(*context));
836 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
837 context->Eax = EAX_sig(sigcontext);
838 context->Ebx = EBX_sig(sigcontext);
839 context->Ecx = ECX_sig(sigcontext);
840 context->Edx = EDX_sig(sigcontext);
841 context->Esi = ESI_sig(sigcontext);
842 context->Edi = EDI_sig(sigcontext);
843 context->Ebp = EBP_sig(sigcontext);
844 context->EFlags = EFL_sig(sigcontext);
845 context->Eip = EIP_sig(sigcontext);
846 context->Esp = ESP_sig(sigcontext);
847 context->SegCs = LOWORD(CS_sig(sigcontext));
848 context->SegDs = LOWORD(DS_sig(sigcontext));
849 context->SegEs = LOWORD(ES_sig(sigcontext));
850 context->SegFs = fs;
851 context->SegGs = gs;
852 context->SegSs = LOWORD(SS_sig(sigcontext));
853 context->Dr0 = regs->dr0;
854 context->Dr1 = regs->dr1;
855 context->Dr2 = regs->dr2;
856 context->Dr3 = regs->dr3;
857 context->Dr6 = regs->dr6;
858 context->Dr7 = regs->dr7;
859
860 if (fpu)
861 {
862 context->ContextFlags |= CONTEXT_FLOATING_POINT;
863 context->FloatSave = *fpu;
864 }
865 if (fpux)
866 {
867 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
868 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
869 fpux_support = 1;
870 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
871 }
872 if (!fpu && !fpux) save_fpu( context );
873 }
874
875
876 /***********************************************************************
877 * restore_context
878 *
879 * Restore the signal info from the context.
880 */
881 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
882 {
883 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
884 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
885 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
886
887 regs->dr0 = context->Dr0;
888 regs->dr1 = context->Dr1;
889 regs->dr2 = context->Dr2;
890 regs->dr3 = context->Dr3;
891 regs->dr6 = context->Dr6;
892 regs->dr7 = context->Dr7;
893 EAX_sig(sigcontext) = context->Eax;
894 EBX_sig(sigcontext) = context->Ebx;
895 ECX_sig(sigcontext) = context->Ecx;
896 EDX_sig(sigcontext) = context->Edx;
897 ESI_sig(sigcontext) = context->Esi;
898 EDI_sig(sigcontext) = context->Edi;
899 EBP_sig(sigcontext) = context->Ebp;
900 EFL_sig(sigcontext) = context->EFlags;
901 EIP_sig(sigcontext) = context->Eip;
902 ESP_sig(sigcontext) = context->Esp;
903 CS_sig(sigcontext) = context->SegCs;
904 DS_sig(sigcontext) = context->SegDs;
905 ES_sig(sigcontext) = context->SegEs;
906 SS_sig(sigcontext) = context->SegSs;
907 #ifdef GS_sig
908 GS_sig(sigcontext) = context->SegGs;
909 #else
910 wine_set_gs( context->SegGs );
911 #endif
912 #ifdef FS_sig
913 FS_sig(sigcontext) = context->SegFs;
914 #else
915 wine_set_fs( context->SegFs );
916 #endif
917
918 if (fpu) *fpu = context->FloatSave;
919 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
920 if (!fpu && !fpux) restore_fpu( context );
921 }
922
923
924 /***********************************************************************
925 * RtlCaptureContext (NTDLL.@)
926 */
927 void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
928 {
929 *context = *regs;
930 if (fpux_support) save_fpux( context );
931 else save_fpu( context );
932 }
933 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
934
935
936 /***********************************************************************
937 * set_cpu_context
938 *
939 * Set the new CPU context. Used by NtSetContextThread.
940 */
941 void set_cpu_context( const CONTEXT *context )
942 {
943 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
944
945 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
946 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
947
948 if (flags & CONTEXT_DEBUG_REGISTERS)
949 {
950 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
951 regs->dr0 = context->Dr0;
952 regs->dr1 = context->Dr1;
953 regs->dr2 = context->Dr2;
954 regs->dr3 = context->Dr3;
955 regs->dr6 = context->Dr6;
956 regs->dr7 = context->Dr7;
957 }
958 if (flags & CONTEXT_FULL)
959 {
960 if (!(flags & CONTEXT_CONTROL))
961 FIXME( "setting partial context (%x) not supported\n", flags );
962 else if (flags & CONTEXT_SEGMENTS)
963 __wine_call_from_32_restore_regs( context );
964 else
965 {
966 CONTEXT newcontext = *context;
967 newcontext.SegDs = wine_get_ds();
968 newcontext.SegEs = wine_get_es();
969 newcontext.SegFs = wine_get_fs();
970 newcontext.SegGs = wine_get_gs();
971 __wine_call_from_32_restore_regs( &newcontext );
972 }
973 }
974 }
975
976
977 /***********************************************************************
978 * is_privileged_instr
979 *
980 * Check if the fault location is a privileged instruction.
981 * Based on the instruction emulation code in dlls/kernel/instr.c.
982 */
983 static inline DWORD is_privileged_instr( CONTEXT86 *context )
984 {
985 const BYTE *instr;
986 unsigned int prefix_count = 0;
987
988 if (!wine_ldt_is_system( context->SegCs )) return 0;
989 instr = (BYTE *)context->Eip;
990
991 for (;;) switch(*instr)
992 {
993 /* instruction prefixes */
994 case 0x2e: /* %cs: */
995 case 0x36: /* %ss: */
996 case 0x3e: /* %ds: */
997 case 0x26: /* %es: */
998 case 0x64: /* %fs: */
999 case 0x65: /* %gs: */
1000 case 0x66: /* opcode size */
1001 case 0x67: /* addr size */
1002 case 0xf0: /* lock */
1003 case 0xf2: /* repne */
1004 case 0xf3: /* repe */
1005 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1006 instr++;
1007 continue;
1008
1009 case 0x0f: /* extended instruction */
1010 switch(instr[1])
1011 {
1012 case 0x20: /* mov crX, reg */
1013 case 0x21: /* mov drX, reg */
1014 case 0x22: /* mov reg, crX */
1015 case 0x23: /* mov reg drX */
1016 return EXCEPTION_PRIV_INSTRUCTION;
1017 }
1018 return 0;
1019 case 0x6c: /* insb (%dx) */
1020 case 0x6d: /* insl (%dx) */
1021 case 0x6e: /* outsb (%dx) */
1022 case 0x6f: /* outsl (%dx) */
1023 case 0xcd: /* int $xx */
1024 case 0xe4: /* inb al,XX */
1025 case 0xe5: /* in (e)ax,XX */
1026 case 0xe6: /* outb XX,al */
1027 case 0xe7: /* out XX,(e)ax */
1028 case 0xec: /* inb (%dx),%al */
1029 case 0xed: /* inl (%dx),%eax */
1030 case 0xee: /* outb %al,(%dx) */
1031 case 0xef: /* outl %eax,(%dx) */
1032 case 0xf4: /* hlt */
1033 case 0xfa: /* cli */
1034 case 0xfb: /* sti */
1035 return EXCEPTION_PRIV_INSTRUCTION;
1036 default:
1037 return 0;
1038 }
1039 }
1040
1041
1042 #include "pshpack1.h"
1043 struct atl_thunk
1044 {
1045 DWORD movl; /* movl this,4(%esp) */
1046 DWORD this;
1047 BYTE jmp; /* jmp func */
1048 int func;
1049 };
1050 #include "poppack.h"
1051
1052 /**********************************************************************
1053 * check_atl_thunk
1054 *
1055 * Check if code destination is an ATL thunk, and emulate it if so.
1056 */
1057 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1058 {
1059 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1060 BOOL ret = FALSE;
1061
1062 __TRY
1063 {
1064 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1065 {
1066 *((DWORD *)context->Esp + 1) = thunk->this;
1067 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1068 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1069 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1070 ret = TRUE;
1071 }
1072 }
1073 __EXCEPT_PAGE_FAULT
1074 {
1075 return FALSE;
1076 }
1077 __ENDTRY
1078 return ret;
1079 }
1080
1081
1082 /***********************************************************************
1083 * setup_exception_record
1084 *
1085 * Setup the exception record and context on the thread stack.
1086 */
1087 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1088 WORD fs, WORD gs, raise_func func )
1089 {
1090 struct stack_layout
1091 {
1092 void *ret_addr; /* return address from raise_func */
1093 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1094 CONTEXT *context_ptr; /* second arg for raise_func */
1095 CONTEXT context;
1096 EXCEPTION_RECORD rec;
1097 DWORD ebp;
1098 DWORD eip;
1099 } *stack = stack_ptr;
1100 DWORD exception_code = 0;
1101
1102 /* stack sanity checks */
1103
1104 if ((char *)stack >= (char *)get_signal_stack() &&
1105 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1106 {
1107 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1108 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1109 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1110 NtCurrentTeb()->Tib.StackBase );
1111 server_abort_thread(1);
1112 }
1113
1114 if (stack - 1 > stack || /* check for overflow in subtraction */
1115 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1116 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1117 {
1118 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1119 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1120 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1121 NtCurrentTeb()->Tib.StackBase );
1122 }
1123 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1124 {
1125 /* stack overflow on last page, unrecoverable */
1126 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1127 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1128 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1129 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1130 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1131 server_abort_thread(1);
1132 }
1133 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1134 {
1135 /* stack access below stack limit, may be recoverable */
1136 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1137 else
1138 {
1139 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1140 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1141 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1142 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1143 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1144 server_abort_thread(1);
1145 }
1146 }
1147
1148 stack--; /* push the stack_layout structure */
1149 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1150 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1151 #elif defined(VALGRIND_MAKE_WRITABLE)
1152 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1153 #endif
1154 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1155 stack->rec_ptr = &stack->rec;
1156 stack->context_ptr = &stack->context;
1157
1158 stack->rec.ExceptionRecord = NULL;
1159 stack->rec.ExceptionCode = exception_code;
1160 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1161 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1162 stack->rec.NumberParameters = 0;
1163
1164 save_context( &stack->context, sigcontext, fs, gs );
1165
1166 /* now modify the sigcontext to return to the raise function */
1167 ESP_sig(sigcontext) = (DWORD)stack;
1168 EIP_sig(sigcontext) = (DWORD)func;
1169 /* clear single-step, direction, and align check flag */
1170 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1171 CS_sig(sigcontext) = wine_get_cs();
1172 DS_sig(sigcontext) = wine_get_ds();
1173 ES_sig(sigcontext) = wine_get_es();
1174 FS_sig(sigcontext) = wine_get_fs();
1175 GS_sig(sigcontext) = wine_get_gs();
1176 SS_sig(sigcontext) = wine_get_ss();
1177
1178 return stack->rec_ptr;
1179 }
1180
1181
1182 /***********************************************************************
1183 * setup_exception
1184 *
1185 * Setup a proper stack frame for the raise function, and modify the
1186 * sigcontext so that the return from the signal handler will call
1187 * the raise function.
1188 */
1189 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1190 {
1191 WORD fs, gs;
1192 void *stack = init_handler( sigcontext, &fs, &gs );
1193
1194 return setup_exception_record( sigcontext, stack, fs, gs, func );
1195 }
1196
1197
1198 /***********************************************************************
1199 * get_exception_context
1200 *
1201 * Get a pointer to the context built by setup_exception.
1202 */
1203 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1204 {
1205 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1206 }
1207
1208
1209 /**********************************************************************
1210 * get_fpu_code
1211 *
1212 * Get the FPU exception code from the FPU status.
1213 */
1214 static inline DWORD get_fpu_code( const CONTEXT *context )
1215 {
1216 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1217
1218 if (status & 0x01) /* IE */
1219 {
1220 if (status & 0x40) /* SF */
1221 return EXCEPTION_FLT_STACK_CHECK;
1222 else
1223 return EXCEPTION_FLT_INVALID_OPERATION;
1224 }
1225 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1226 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1227 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1228 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1229 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1230 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1231 }
1232
1233
1234 /**********************************************************************
1235 * raise_segv_exception
1236 */
1237 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1238 {
1239 switch(rec->ExceptionCode)
1240 {
1241 case EXCEPTION_ACCESS_VIOLATION:
1242 if (rec->NumberParameters == 2)
1243 {
1244 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1245 goto done;
1246 if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1247 rec->ExceptionInformation[0] )))
1248 goto done;
1249 }
1250 break;
1251 case EXCEPTION_DATATYPE_MISALIGNMENT:
1252 /* FIXME: pass through exception handler first? */
1253 if (context->EFlags & 0x00040000)
1254 {
1255 /* Disable AC flag, return */
1256 context->EFlags &= ~0x00040000;
1257 goto done;
1258 }
1259 break;
1260 }
1261 __regs_RtlRaiseException( rec, context );
1262 done:
1263 NtSetContextThread( GetCurrentThread(), context );
1264 }
1265
1266
1267 /**********************************************************************
1268 * raise_trap_exception
1269 */
1270 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1271 {
1272 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1273 {
1274 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1275
1276 /* when single stepping can't tell whether this is a hw bp or a
1277 * single step interrupt. try to avoid as much overhead as possible
1278 * and only do a server call if there is any hw bp enabled. */
1279
1280 if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1281 {
1282 /* (possible) hardware breakpoint, fetch the debug registers */
1283 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1284 NtGetContextThread(GetCurrentThread(), context);
1285 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1286 }
1287
1288 context->EFlags &= ~0x100; /* clear single-step flag */
1289 }
1290
1291 __regs_RtlRaiseException( rec, context );
1292 NtSetContextThread( GetCurrentThread(), context );
1293 }
1294
1295
1296 /**********************************************************************
1297 * raise_exception
1298 *
1299 * Generic raise function for exceptions that don't need special treatment.
1300 */
1301 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1302 {
1303 __regs_RtlRaiseException( rec, context );
1304 NtSetContextThread( GetCurrentThread(), context );
1305 }
1306
1307
1308 #ifdef __HAVE_VM86
1309 /**********************************************************************
1310 * raise_vm86_sti_exception
1311 */
1312 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1313 {
1314 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1315 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1316
1317 if (ntdll_get_thread_data()->vm86_ptr)
1318 {
1319 if (((char*)context->Eip >= (char*)vm86_return) &&
1320 ((char*)context->Eip <= (char*)vm86_return_end) &&
1321 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1322 /* exiting from VM86, can't throw */
1323 goto done;
1324 }
1325 merge_vm86_pending_flags( rec );
1326 }
1327 else if (get_vm86_teb_info()->dpmi_vif &&
1328 !wine_ldt_is_system(context->SegCs) &&
1329 !wine_ldt_is_system(context->SegSs))
1330 {
1331 /* Executing DPMI code and virtual interrupts are enabled. */
1332 get_vm86_teb_info()->vm86_pending = 0;
1333 __regs_RtlRaiseException( rec, context );
1334 }
1335 done:
1336 NtSetContextThread( GetCurrentThread(), context );
1337 }
1338
1339
1340 /**********************************************************************
1341 * usr2_handler
1342 *
1343 * Handler for SIGUSR2.
1344 * We use it to signal that the running __wine_enter_vm86() should
1345 * immediately set VIP_FLAG, causing pending events to be handled
1346 * as early as possible.
1347 */
1348 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1349 {
1350 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1351 rec->ExceptionCode = EXCEPTION_VM86_STI;
1352 }
1353 #endif /* __HAVE_VM86 */
1354
1355
1356 /**********************************************************************
1357 * segv_handler
1358 *
1359 * Handler for SIGSEGV and related errors.
1360 */
1361 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1362 {
1363 WORD fs, gs;
1364 EXCEPTION_RECORD *rec;
1365 SIGCONTEXT *context = sigcontext;
1366 void *stack = init_handler( sigcontext, &fs, &gs );
1367
1368 /* check for page fault inside the thread stack */
1369 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1370 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1371 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1372 virtual_handle_stack_fault( siginfo->si_addr ))
1373 {
1374 /* check if this was the last guard page */
1375 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1376 {
1377 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1378 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1379 }
1380 return;
1381 }
1382
1383 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1384 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1385
1386 switch(get_trap_code(context))
1387 {
1388 case TRAP_x86_OFLOW: /* Overflow exception */
1389 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1390 break;
1391 case TRAP_x86_BOUND: /* Bound range exception */
1392 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1393 break;
1394 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1395 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1396 break;
1397 case TRAP_x86_STKFLT: /* Stack fault */
1398 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1399 break;
1400 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1401 case TRAP_x86_PROTFLT: /* General protection fault */
1402 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1403 {
1404 WORD err = get_error_code(context);
1405 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1406 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1407 rec->NumberParameters = 2;
1408 rec->ExceptionInformation[0] = 0;
1409 /* if error contains a LDT selector, use that as fault address */
1410 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1411 rec->ExceptionInformation[1] = err & ~7;
1412 else
1413 rec->ExceptionInformation[1] = 0xffffffff;
1414 }
1415 break;
1416 case TRAP_x86_PAGEFLT: /* Page fault */
1417 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1418 rec->NumberParameters = 2;
1419 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1420 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1421 break;
1422 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1423 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1424 break;
1425 default:
1426 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1427 /* fall through */
1428 case TRAP_x86_NMI: /* NMI interrupt */
1429 case TRAP_x86_DNA: /* Device not available exception */
1430 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1431 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1432 case TRAP_x86_MCHK: /* Machine check exception */
1433 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1434 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1435 break;
1436 }
1437 }
1438
1439
1440 /**********************************************************************
1441 * trap_handler
1442 *
1443 * Handler for SIGTRAP.
1444 */
1445 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1446 {
1447 SIGCONTEXT *context = sigcontext;
1448 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1449
1450 switch(get_trap_code(context))
1451 {
1452 case TRAP_x86_TRCTRAP: /* Single-step exception */
1453 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1454 break;
1455 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1456 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1457 /* fall through */
1458 default:
1459 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1460 break;
1461 }
1462 }
1463
1464
1465 /**********************************************************************
1466 * fpe_handler
1467 *
1468 * Handler for SIGFPE.
1469 */
1470 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1471 {
1472 CONTEXT *win_context;
1473 SIGCONTEXT *context = sigcontext;
1474 EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1475
1476 win_context = get_exception_context( rec );
1477
1478 switch(get_trap_code(context))
1479 {
1480 case TRAP_x86_DIVIDE: /* Division by zero exception */
1481 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1482 break;
1483 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1484 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1485 break;
1486 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1487 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1488 rec->ExceptionCode = get_fpu_code( win_context );
1489 rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1490 break;
1491 case TRAP_x86_CACHEFLT: /* SIMD exception */
1492 /* TODO:
1493 * Behaviour only tested for divide-by-zero exceptions
1494 * Check for other SIMD exceptions as well */
1495 if(siginfo->si_code != FPE_FLTDIV)
1496 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1497 siginfo->si_code);
1498
1499 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1500 rec->NumberParameters = 1;
1501 /* no idea what meaning is actually behind this but that's what native does */
1502 rec->ExceptionInformation[0] = 0;
1503 break;
1504 default:
1505 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1506 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1507 break;
1508 }
1509 }
1510
1511
1512 /**********************************************************************
1513 * int_handler
1514 *
1515 * Handler for SIGINT.
1516 *
1517 * FIXME: should not be calling external functions on the signal stack.
1518 */
1519 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1520 {
1521 WORD fs, gs;
1522 init_handler( sigcontext, &fs, &gs );
1523 if (!dispatch_signal(SIGINT))
1524 {
1525 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1526 rec->ExceptionCode = CONTROL_C_EXIT;
1527 }
1528 }
1529
1530 /**********************************************************************
1531 * abrt_handler
1532 *
1533 * Handler for SIGABRT.
1534 */
1535 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1536 {
1537 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1538 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1539 rec->ExceptionFlags = EH_NONCONTINUABLE;
1540 }
1541
1542
1543 /**********************************************************************
1544 * quit_handler
1545 *
1546 * Handler for SIGQUIT.
1547 */
1548 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1549 {
1550 WORD fs, gs;
1551 init_handler( sigcontext, &fs, &gs );
1552 server_abort_thread(0);
1553 }
1554
1555
1556 /**********************************************************************
1557 * usr1_handler
1558 *
1559 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1560 */
1561 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1562 {
1563 CONTEXT context;
1564 WORD fs, gs;
1565
1566 init_handler( sigcontext, &fs, &gs );
1567 save_context( &context, sigcontext, fs, gs );
1568 wait_suspend( &context );
1569 restore_context( &context, sigcontext );
1570 }
1571
1572
1573 /**********************************************************************
1574 * get_signal_stack_total_size
1575 *
1576 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1577 * Must be a power of two.
1578 */
1579 size_t get_signal_stack_total_size(void)
1580 {
1581 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
1582
1583 if (!signal_stack_size)
1584 {
1585 size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1586 /* find the first power of two not smaller than min_size */
1587 while (size < min_size) size *= 2;
1588 signal_stack_mask = size - 1;
1589 signal_stack_size = size - teb_size;
1590 }
1591 return signal_stack_size + teb_size;
1592 }
1593
1594
1595 /***********************************************************************
1596 * __wine_set_signal_handler (NTDLL.@)
1597 */
1598 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1599 {
1600 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1601 if (handlers[sig] != NULL) return -2;
1602 handlers[sig] = wsh;
1603 return 0;
1604 }
1605
1606
1607 /**********************************************************************
1608 * signal_init_thread
1609 */
1610 void signal_init_thread(void)
1611 {
1612 #ifdef HAVE_SIGALTSTACK
1613 stack_t ss;
1614
1615 #ifdef __APPLE__
1616 int mib[2], val = 1;
1617
1618 mib[0] = CTL_KERN;
1619 mib[1] = KERN_THALTSTACK;
1620 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1621 #endif
1622
1623 ss.ss_sp = get_signal_stack();
1624 ss.ss_size = signal_stack_size;
1625 ss.ss_flags = 0;
1626 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1627 #endif /* HAVE_SIGALTSTACK */
1628
1629 ntdll_get_thread_data()->gs = wine_get_gs();
1630 }
1631
1632 /**********************************************************************
1633 * signal_init_process
1634 */
1635 void signal_init_process(void)
1636 {
1637 struct sigaction sig_act;
1638
1639 sig_act.sa_mask = server_block_set;
1640 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1641 #ifdef SA_ONSTACK
1642 sig_act.sa_flags |= SA_ONSTACK;
1643 #endif
1644
1645 sig_act.sa_sigaction = int_handler;
1646 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1647 sig_act.sa_sigaction = fpe_handler;
1648 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1649 sig_act.sa_sigaction = abrt_handler;
1650 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1651 sig_act.sa_sigaction = quit_handler;
1652 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1653 sig_act.sa_sigaction = usr1_handler;
1654 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1655
1656 sig_act.sa_sigaction = segv_handler;
1657 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1658 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1659 #ifdef SIGBUS
1660 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1661 #endif
1662
1663 #ifdef SIGTRAP
1664 sig_act.sa_sigaction = trap_handler;
1665 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1666 #endif
1667
1668 #ifdef __HAVE_VM86
1669 sig_act.sa_sigaction = usr2_handler;
1670 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1671 #endif
1672
1673 signal_init_thread();
1674 return;
1675
1676 error:
1677 perror("sigaction");
1678 exit(1);
1679 }
1680
1681
1682 #ifdef __HAVE_VM86
1683 /**********************************************************************
1684 * __wine_enter_vm86 (NTDLL.@)
1685 *
1686 * Enter vm86 mode with the specified register context.
1687 */
1688 void __wine_enter_vm86( CONTEXT *context )
1689 {
1690 EXCEPTION_RECORD rec;
1691 int res;
1692 struct vm86plus_struct vm86;
1693
1694 memset( &vm86, 0, sizeof(vm86) );
1695 for (;;)
1696 {
1697 restore_vm86_context( context, &vm86 );
1698
1699 ntdll_get_thread_data()->vm86_ptr = &vm86;
1700 merge_vm86_pending_flags( &rec );
1701
1702 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1703 if (res < 0)
1704 {
1705 errno = -res;
1706 return;
1707 }
1708
1709 save_vm86_context( context, &vm86 );
1710
1711 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1712 rec.ExceptionRecord = NULL;
1713 rec.ExceptionAddress = (LPVOID)context->Eip;
1714 rec.NumberParameters = 0;
1715
1716 switch(VM86_TYPE(res))
1717 {
1718 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1719 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1720 break;
1721 case VM86_TRAP: /* return due to DOS-debugger request */
1722 switch(VM86_ARG(res))
1723 {
1724 case TRAP_x86_TRCTRAP: /* Single-step exception */
1725 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1726 break;
1727 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1728 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1729 /* fall through */
1730 default:
1731 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1732 break;
1733 }
1734 break;
1735 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1736 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1737 rec.NumberParameters = 1;
1738 rec.ExceptionInformation[0] = VM86_ARG(res);
1739 break;
1740 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1741 context->EFlags |= VIF_FLAG;
1742 context->EFlags &= ~VIP_FLAG;
1743 get_vm86_teb_info()->vm86_pending = 0;
1744 rec.ExceptionCode = EXCEPTION_VM86_STI;
1745 break;
1746 case VM86_PICRETURN: /* return due to pending PIC request */
1747 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1748 break;
1749 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1750 default:
1751 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1752 continue;
1753 }
1754 __regs_RtlRaiseException( &rec, context );
1755 }
1756 }
1757
1758 #else /* __HAVE_VM86 */
1759 /**********************************************************************
1760 * __wine_enter_vm86 (NTDLL.@)
1761 */
1762 void __wine_enter_vm86( CONTEXT *context )
1763 {
1764 MESSAGE("vm86 mode not supported on this platform\n");
1765 }
1766 #endif /* __HAVE_VM86 */
1767
1768 /**********************************************************************
1769 * DbgBreakPoint (NTDLL.@)
1770 */
1771 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1772
1773 /**********************************************************************
1774 * DbgUserBreakPoint (NTDLL.@)
1775 */
1776 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1777
1778
1779 /**********************************************************************
1780 * EXC_CallHandler (internal)
1781 *
1782 * Some exception handlers depend on EBP to have a fixed position relative to
1783 * the exception frame.
1784 * Shrinker depends on (*1) doing what it does,
1785 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1786 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1787 * function calling the handler having only 5 parameters (*4).
1788 */
1789 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1790 " pushl %ebp\n"
1791 " movl %esp, %ebp\n"
1792 " pushl %ebx\n"
1793 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1794 " pushl 24(%ebp)\n"
1795 " pushl 20(%ebp)\n"
1796 " pushl 16(%ebp)\n"
1797 " pushl 12(%ebp)\n"
1798 " pushl 8(%ebp)\n"
1799 " call " __ASM_NAME("call_exception_handler") "\n"
1800 " popl %ebx\n"
1801 " leave\n"
1802 " ret\n"
1803 )
1804 __ASM_GLOBAL_FUNC(call_exception_handler,
1805 " pushl %ebp\n"
1806 " movl %esp, %ebp\n"
1807 " subl $12,%esp\n"
1808 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1809 " pushl %edx\n" /* handler be handled by... */
1810 " .byte 0x64\n"
1811 " pushl (0)\n" /* nested_handler (passed in edx). */
1812 " .byte 0x64\n"
1813 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1814 " pushl 20(%ebp)\n"
1815 " pushl 16(%ebp)\n"
1816 " pushl 12(%ebp)\n"
1817 " pushl 8(%ebp)\n"
1818 " movl 24(%ebp), %ecx\n" /* (*1) */
1819 " call *%ecx\n" /* call handler. (*2) */
1820 " .byte 0x64\n"
1821 " movl (0), %esp\n" /* restore previous... (*3) */
1822 " .byte 0x64\n"
1823 " popl (0)\n" /* exception frame. */
1824 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1825 " popl %ebp\n"
1826 " ret $20\n" /* (*4) */
1827 )
1828 #endif /* __i386__ */
useful hacks and other patches not (yet) suitable for mainline