Implemented WNetEnumCachedPasswords.
[wine] / dlls / ntdll / signal_i386.c
CommitLineData
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1/*
2 * i386 signal handling routines
9a624916 3 *
3d06d20b 4 * Copyright 1999 Alexandre Julliard
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 */
20
21#ifdef __i386__
22
23#include "config.h"
894b188f 24#include "wine/port.h"
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25
26#include <errno.h>
27#include <signal.h>
28#include <stdlib.h>
e37c6e18 29#include <stdarg.h>
383da68c 30#include <stdio.h>
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31#ifdef HAVE_UNISTD_H
32# include <unistd.h>
33#endif
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34
35#ifdef HAVE_SYS_PARAM_H
36# include <sys/param.h>
37#endif
38#ifdef HAVE_SYSCALL_H
39# include <syscall.h>
40#else
41# ifdef HAVE_SYS_SYSCALL_H
42# include <sys/syscall.h>
43# endif
44#endif
45
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46#ifdef HAVE_SYS_VM86_H
47# include <sys/vm86.h>
48#endif
49
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50#ifdef HAVE_SYS_SIGNAL_H
51# include <sys/signal.h>
52#endif
53
435e2e63 54#include "windef.h"
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55#include "winbase.h"
56#include "winreg.h"
9c1de6de 57#include "winternl.h"
59008670 58#include "wine/library.h"
217fdab7 59#include "ntdll_misc.h"
916f9756 60
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61/***********************************************************************
62 * signal context platform-specific definitions
63 */
64
65#ifdef linux
66typedef struct
67{
68 unsigned short sc_gs, __gsh;
69 unsigned short sc_fs, __fsh;
70 unsigned short sc_es, __esh;
71 unsigned short sc_ds, __dsh;
72 unsigned long sc_edi;
73 unsigned long sc_esi;
74 unsigned long sc_ebp;
75 unsigned long sc_esp;
76 unsigned long sc_ebx;
77 unsigned long sc_edx;
78 unsigned long sc_ecx;
79 unsigned long sc_eax;
80 unsigned long sc_trapno;
81 unsigned long sc_err;
82 unsigned long sc_eip;
83 unsigned short sc_cs, __csh;
84 unsigned long sc_eflags;
85 unsigned long esp_at_signal;
86 unsigned short sc_ss, __ssh;
87 unsigned long i387;
88 unsigned long oldmask;
89 unsigned long cr2;
90} SIGCONTEXT;
91
92#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
93#define HANDLER_CONTEXT (&__context)
94
95/* this is the sigaction structure from the Linux 2.1.20 kernel. */
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96struct kernel_sigaction
97{
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98 void (*ksa_handler)();
99 unsigned long ksa_mask;
100 unsigned long ksa_flags;
101 void *ksa_restorer;
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102};
103
104/* Similar to the sigaction function in libc, except it leaves alone the
105 restorer field, which is used to specify the signal stack address */
106static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
107 struct kernel_sigaction *old )
108{
109 __asm__ __volatile__( "pushl %%ebx\n\t"
110 "movl %2,%%ebx\n\t"
111 "int $0x80\n\t"
112 "popl %%ebx"
113 : "=a" (sig)
114 : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
115 if (sig>=0) return 0;
116 errno = -sig;
117 return -1;
118}
119
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120#ifdef HAVE_SIGALTSTACK
121/* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
122static inline int wine_sigaltstack( const struct sigaltstack *new,
123 struct sigaltstack *old )
124{
125 int ret;
126 __asm__ __volatile__( "pushl %%ebx\n\t"
127 "movl %2,%%ebx\n\t"
128 "int $0x80\n\t"
129 "popl %%ebx"
130 : "=a" (ret)
131 : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
132 if (ret >= 0) return 0;
133 errno = -ret;
134 return -1;
135}
136#endif
137
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138#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
139
140int vm86_enter( void **vm86_ptr );
141void vm86_return(void);
142void vm86_return_end(void);
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143__ASM_GLOBAL_FUNC(vm86_enter,
144 "pushl %ebp\n\t"
145 "movl %esp, %ebp\n\t"
146 "movl $166,%eax\n\t" /*SYS_vm86*/
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147 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
148 "movl (%ecx),%ecx\n\t"
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149 "pushl %ebx\n\t"
150 "movl $1,%ebx\n\t" /*VM86_ENTER*/
151 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
0b6c6e76 152 "pushl %fs\n\t"
063cff86 153 "pushl %gs\n\t"
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154 "int $0x80\n"
155 ".globl " __ASM_NAME("vm86_return") "\n\t"
65c6d385 156 __ASM_FUNC("vm86_return") "\n"
b59627c8 157 __ASM_NAME("vm86_return") ":\n\t"
78675ba2 158 "popl %gs\n\t"
063cff86 159 "popl %fs\n\t"
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160 "popl %ecx\n\t"
161 "popl %ebx\n\t"
b59627c8 162 "popl %ebp\n\t"
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163 "testl %eax,%eax\n\t"
164 "jl 0f\n\t"
165 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
166 "je " __ASM_NAME("vm86_enter") "\n\t"
167 "0:\n\t"
168 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
169 "movl $0,(%ecx)\n\t"
170 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
65c6d385 171 __ASM_FUNC("vm86_return_end") "\n"
4eb0bebd 172 __ASM_NAME("vm86_return_end") ":\n\t"
b59627c8 173 "ret" );
45b2c868 174
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175#ifdef HAVE_SYS_VM86_H
176# define __HAVE_VM86
177#endif
7f862cb2 178
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179#endif /* linux */
180
181#ifdef BSDI
182
183#define EAX_sig(context) ((context)->tf_eax)
184#define EBX_sig(context) ((context)->tf_ebx)
185#define ECX_sig(context) ((context)->tf_ecx)
186#define EDX_sig(context) ((context)->tf_edx)
187#define ESI_sig(context) ((context)->tf_esi)
188#define EDI_sig(context) ((context)->tf_edi)
189#define EBP_sig(context) ((context)->tf_ebp)
9a624916 190
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191#define CS_sig(context) ((context)->tf_cs)
192#define DS_sig(context) ((context)->tf_ds)
193#define ES_sig(context) ((context)->tf_es)
194#define SS_sig(context) ((context)->tf_ss)
195
196#include <machine/frame.h>
197typedef struct trapframe SIGCONTEXT;
198
199#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
200#define HANDLER_CONTEXT __context
201
202#define EFL_sig(context) ((context)->tf_eflags)
203
204#define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
205#define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
206
207#endif /* bsdi */
208
209#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
210
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211typedef struct sigcontext SIGCONTEXT;
212
213#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
214#define HANDLER_CONTEXT __context
215
216#endif /* FreeBSD */
217
218#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
219
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220#ifdef _SCO_DS
221#include <sys/regset.h>
222#endif
223/* Solaris kludge */
224#undef ERR
225#include <sys/ucontext.h>
226#undef ERR
227typedef struct ucontext SIGCONTEXT;
228
8b39cea3 229#define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
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230#define HANDLER_CONTEXT __context
231
232#endif /* svr4 || SCO_DS */
233
234#ifdef __EMX__
235
236typedef struct
237{
238 unsigned long ContextFlags;
239 FLOATING_SAVE_AREA sc_float;
240 unsigned long sc_gs;
241 unsigned long sc_fs;
242 unsigned long sc_es;
243 unsigned long sc_ds;
244 unsigned long sc_edi;
245 unsigned long sc_esi;
246 unsigned long sc_eax;
247 unsigned long sc_ebx;
248 unsigned long sc_ecx;
249 unsigned long sc_edx;
250 unsigned long sc_ebp;
251 unsigned long sc_eip;
252 unsigned long sc_cs;
253 unsigned long sc_eflags;
254 unsigned long sc_esp;
255 unsigned long sc_ss;
256} SIGCONTEXT;
257
258#endif /* __EMX__ */
259
ac81d02a 260#ifdef __CYGWIN__
3d06d20b 261
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262/* FIXME: This section is just here so it can compile, it's most likely
263 * completely wrong. */
264
265typedef struct
266{
267 unsigned short sc_gs, __gsh;
268 unsigned short sc_fs, __fsh;
269 unsigned short sc_es, __esh;
270 unsigned short sc_ds, __dsh;
271 unsigned long sc_edi;
272 unsigned long sc_esi;
273 unsigned long sc_ebp;
274 unsigned long sc_esp;
275 unsigned long sc_ebx;
276 unsigned long sc_edx;
277 unsigned long sc_ecx;
278 unsigned long sc_eax;
279 unsigned long sc_trapno;
280 unsigned long sc_err;
281 unsigned long sc_eip;
282 unsigned short sc_cs, __csh;
283 unsigned long sc_eflags;
284 unsigned long esp_at_signal;
285 unsigned short sc_ss, __ssh;
286 unsigned long i387;
287 unsigned long oldmask;
288 unsigned long cr2;
289} SIGCONTEXT;
290
291#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
292#define HANDLER_CONTEXT (&__context)
293
294#endif /* __CYGWIN__ */
295
296#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
297 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
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298
299#define EAX_sig(context) ((context)->sc_eax)
300#define EBX_sig(context) ((context)->sc_ebx)
301#define ECX_sig(context) ((context)->sc_ecx)
302#define EDX_sig(context) ((context)->sc_edx)
303#define ESI_sig(context) ((context)->sc_esi)
304#define EDI_sig(context) ((context)->sc_edi)
305#define EBP_sig(context) ((context)->sc_ebp)
9a624916 306
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307#define CS_sig(context) ((context)->sc_cs)
308#define DS_sig(context) ((context)->sc_ds)
309#define ES_sig(context) ((context)->sc_es)
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310#define FS_sig(context) ((context)->sc_fs)
311#define GS_sig(context) ((context)->sc_gs)
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312#define SS_sig(context) ((context)->sc_ss)
313
314#define TRAP_sig(context) ((context)->sc_trapno)
315
316#ifdef __NetBSD__
317#define ERROR_sig(context) ((context)->sc_err)
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318#endif
319
320#ifdef linux
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321#define ERROR_sig(context) ((context)->sc_err)
322#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
ebe67a28 323#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
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324#endif
325
14251f1b 326#ifdef __FreeBSD__
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327#define EFL_sig(context) ((context)->sc_efl)
328/* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
ebe67a28 329#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
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330#else
331#define EFL_sig(context) ((context)->sc_eflags)
9a624916 332#endif
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333
334#define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
335#define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
336
337#endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
338
339#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
340
341#ifdef _SCO_DS
342#define gregs regs
343#endif
344
345#define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
346#define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
347#define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
348#define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
349#define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
350#define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
351#define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
9a624916 352
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353#define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
354#define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
355#define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
356#define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
9a624916 357
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358#define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
359#define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
360
361#define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
9a624916 362
3d06d20b 363#define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
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364#ifdef UESP
365#define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
366#elif defined(R_ESP)
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367#define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
368#else
369#define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
370#endif
371#ifdef TRAPNO
372#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
373#endif
374
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375#define FAULT_ADDRESS (__siginfo->si_addr)
376
3d06d20b 377#endif /* svr4 || SCO_DS */
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378
379
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380/* exception code definitions (already defined by FreeBSD/NetBSD) */
381#if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
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382#define T_DIVIDE 0 /* Division by zero exception */
383#define T_TRCTRAP 1 /* Single-step exception */
384#define T_NMI 2 /* NMI interrupt */
385#define T_BPTFLT 3 /* Breakpoint exception */
386#define T_OFLOW 4 /* Overflow exception */
387#define T_BOUND 5 /* Bound range exception */
388#define T_PRIVINFLT 6 /* Invalid opcode exception */
389#define T_DNA 7 /* Device not available exception */
390#define T_DOUBLEFLT 8 /* Double fault exception */
391#define T_FPOPFLT 9 /* Coprocessor segment overrun */
392#define T_TSSFLT 10 /* Invalid TSS exception */
393#define T_SEGNPFLT 11 /* Segment not present exception */
394#define T_STKFLT 12 /* Stack fault */
395#define T_PROTFLT 13 /* General protection fault */
396#define T_PAGEFLT 14 /* Page fault */
397#define T_RESERVED 15 /* Unknown exception */
398#define T_ARITHTRAP 16 /* Floating point exception */
399#define T_ALIGNFLT 17 /* Alignment check exception */
400#define T_MCHK 18 /* Machine check exception */
401#define T_CACHEFLT 19 /* Cache flush exception */
402#endif
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403#if defined(__NetBSD__)
404#define T_MCHK 19 /* Machine check exception */
405#endif
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406
407#define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
3d06d20b 408
eb94c7d2 409#include "wine/exception.h"
0799c1a7 410#include "wine/debug.h"
282b13bc 411
0799c1a7 412WINE_DEFAULT_DEBUG_CHANNEL(seh);
282b13bc 413
4325554a 414typedef int (*wine_signal_handler)(unsigned int sig);
3d4d7e01
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415
416static wine_signal_handler handlers[256];
417
b4a4c05a 418extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
4cb00196 419extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
3d06d20b 420
bff860c4 421
3d4d7e01
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422/***********************************************************************
423 * dispatch_signal
424 */
4325554a 425inline static int dispatch_signal(unsigned int sig)
3d4d7e01
EP
426{
427 if (handlers[sig] == NULL) return 0;
428 return handlers[sig](sig);
429}
430
431
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432/***********************************************************************
433 * get_trap_code
434 *
435 * Get the trap code for a signal.
436 */
437static inline int get_trap_code( const SIGCONTEXT *sigcontext )
438{
439#ifdef TRAP_sig
440 return TRAP_sig(sigcontext);
441#else
442 return T_UNKNOWN; /* unknown trap code */
443#endif
444}
3d06d20b 445
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446/***********************************************************************
447 * get_error_code
448 *
449 * Get the error code for a signal.
450 */
451static inline int get_error_code( const SIGCONTEXT *sigcontext )
452{
453#ifdef ERROR_sig
454 return ERROR_sig(sigcontext);
455#else
456 return 0;
457#endif
458}
459
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460/***********************************************************************
461 * get_signal_stack
462 *
463 * Get the base of the signal stack for the current thread.
464 */
465static inline void *get_signal_stack(void)
466{
7924f421 467 return (char *)NtCurrentTeb() + 4096;
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468}
469
470
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471/***********************************************************************
472 * get_current_teb
473 *
474 * Get the current teb based on the stack pointer.
475 */
476static inline TEB *get_current_teb(void)
477{
478 unsigned long esp;
479 __asm__("movl %%esp,%0" : "=g" (esp) );
480 return (TEB *)((esp & ~4095) - 4096);
481}
482
483
a274dd91 484#ifdef __HAVE_VM86
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485/***********************************************************************
486 * save_vm86_context
487 *
488 * Set the register values from a vm86 structure.
489 */
490static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
491{
492 context->Eax = vm86->regs.eax;
493 context->Ebx = vm86->regs.ebx;
494 context->Ecx = vm86->regs.ecx;
495 context->Edx = vm86->regs.edx;
496 context->Esi = vm86->regs.esi;
497 context->Edi = vm86->regs.edi;
498 context->Esp = vm86->regs.esp;
499 context->Ebp = vm86->regs.ebp;
500 context->Eip = vm86->regs.eip;
501 context->SegCs = vm86->regs.cs;
502 context->SegDs = vm86->regs.ds;
503 context->SegEs = vm86->regs.es;
504 context->SegFs = vm86->regs.fs;
505 context->SegGs = vm86->regs.gs;
506 context->SegSs = vm86->regs.ss;
507 context->EFlags = vm86->regs.eflags;
508}
509
510
511/***********************************************************************
512 * restore_vm86_context
513 *
514 * Build a vm86 structure from the register values.
515 */
516static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
517{
518 vm86->regs.eax = context->Eax;
519 vm86->regs.ebx = context->Ebx;
520 vm86->regs.ecx = context->Ecx;
521 vm86->regs.edx = context->Edx;
522 vm86->regs.esi = context->Esi;
523 vm86->regs.edi = context->Edi;
524 vm86->regs.esp = context->Esp;
525 vm86->regs.ebp = context->Ebp;
526 vm86->regs.eip = context->Eip;
527 vm86->regs.cs = context->SegCs;
528 vm86->regs.ds = context->SegDs;
529 vm86->regs.es = context->SegEs;
530 vm86->regs.fs = context->SegFs;
531 vm86->regs.gs = context->SegGs;
532 vm86->regs.ss = context->SegSs;
533 vm86->regs.eflags = context->EFlags;
534}
d7ee5f3f
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535
536
537/**********************************************************************
538 * merge_vm86_pending_flags
539 *
540 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
541 * raises exception if there are pending events and VIF flag
542 * has been turned on.
543 *
544 * Called from __wine_enter_vm86 because vm86_enter
545 * doesn't check for pending events.
546 *
547 * Called from raise_vm86_sti_exception to check for
548 * pending events in a signal safe way.
549 */
550static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
551{
552 BOOL check_pending = TRUE;
553 struct vm86plus_struct *vm86 =
554 (struct vm86plus_struct*)(NtCurrentTeb()->vm86_ptr);
555
556 /*
557 * In order to prevent a race when SIGUSR2 occurs while
558 * we are returning from exception handler, pending events
559 * will be rechecked after each raised exception.
560 */
561 while (check_pending && NtCurrentTeb()->vm86_pending)
562 {
563 check_pending = FALSE;
564 NtCurrentTeb()->vm86_ptr = NULL;
565
566 /*
567 * If VIF is set, throw exception.
568 * Note that SIGUSR2 may turn VIF flag off so
569 * VIF check must occur only when TEB.vm86_ptr is NULL.
570 */
571 if (vm86->regs.eflags & VIF_MASK)
572 {
573 CONTEXT vcontext;
574 save_vm86_context( &vcontext, vm86 );
575
576 rec->ExceptionCode = EXCEPTION_VM86_STI;
577 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
578 rec->ExceptionRecord = NULL;
579 rec->NumberParameters = 0;
580 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
581
582 vcontext.EFlags &= ~VIP_MASK;
583 NtCurrentTeb()->vm86_pending = 0;
584 EXC_RtlRaiseException( rec, &vcontext );
585
586 restore_vm86_context( &vcontext, vm86 );
587 check_pending = TRUE;
588 }
589
590 NtCurrentTeb()->vm86_ptr = vm86;
591 }
592
593 /*
594 * Merge VIP flags in a signal safe way. This requires
595 * that the following operation compiles into atomic
596 * instruction.
597 */
598 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
599}
a274dd91 600#endif /* __HAVE_VM86 */
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601
602
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603typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
604
3d06d20b 605
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606/***********************************************************************
607 * init_handler
608 *
609 * Handler initialization when the full context is not needed.
610 */
0f95d549 611static void *init_handler( const SIGCONTEXT *sigcontext )
d04ccb8e 612{
0f95d549 613 void *stack = (void *)ESP_sig(sigcontext);
063cff86 614 TEB *teb = get_current_teb();
0f95d549 615
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616 wine_set_fs( teb->teb_sel );
617
618 /* now restore a proper %gs for the fault handler */
8fb98a41
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619 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
620 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
d04ccb8e 621 {
0f95d549
AJ
622 /*
623 * Win16 or DOS protected mode. Note that during switch
624 * from 16-bit mode to linear mode, CS may be set to system
625 * segment before FS is restored. Fortunately, in this case
626 * SS is still non-system segment. This is why both CS and SS
627 * are checked.
628 */
063cff86
AJ
629 wine_set_gs( teb->gs_sel );
630 stack = (void *)teb->cur_stack;
d04ccb8e
AJ
631 }
632#ifdef __HAVE_VM86
633 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
634 {
0f95d549 635 unsigned int *int_stack = stack;
063cff86 636 /* fetch the saved %gs from the stack */
0f95d549
AJ
637 wine_set_gs( int_stack[0] );
638 }
639#endif
640 else /* 32-bit mode */
d04ccb8e 641 {
78675ba2
AJ
642#ifdef GS_sig
643 wine_set_gs( GS_sig(sigcontext) );
644#endif
d04ccb8e 645 }
0f95d549 646 return stack;
d04ccb8e
AJ
647}
648
649
3d06d20b
AJ
650/***********************************************************************
651 * save_fpu
652 *
9a624916 653 * Set the FPU context from a sigcontext.
3d06d20b 654 */
650ba4df 655inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
3d06d20b
AJ
656{
657#ifdef FPU_sig
658 if (FPU_sig(sigcontext))
659 {
660 context->FloatSave = *FPU_sig(sigcontext);
661 return;
662 }
663#endif /* FPU_sig */
664#ifdef __GNUC__
665 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
666#endif /* __GNUC__ */
667}
668
669
670/***********************************************************************
671 * restore_fpu
672 *
9a624916 673 * Restore the FPU context to a sigcontext.
3d06d20b 674 */
4cb00196 675inline static void restore_fpu( CONTEXT *context )
3d06d20b 676{
52b6bd95
DH
677 /* reset the current interrupt status */
678 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
3d06d20b
AJ
679#ifdef __GNUC__
680 /* avoid nested exceptions */
3d06d20b
AJ
681 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
682#endif /* __GNUC__ */
683}
684
685
4cb00196
AJ
686/***********************************************************************
687 * setup_exception
688 *
689 * Setup a proper stack frame for the raise function, and modify the
690 * sigcontext so that the return from the signal handler will call
691 * the raise function.
692 */
693static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
694{
695 struct stack_layout
696 {
697 void *ret_addr; /* return address from raise_func */
698 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
699 CONTEXT *context_ptr; /* second arg for raise_func */
700 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
701 CONTEXT context;
702 EXCEPTION_RECORD rec;
703 DWORD ebp;
704 DWORD eip;
705 } *stack;
706
707 WORD fs, gs;
708
709 /* get %fs and %gs at time of the fault */
710#ifdef FS_sig
711 fs = LOWORD(FS_sig(sigcontext));
712#else
713 fs = wine_get_fs();
714#endif
715#ifdef GS_sig
716 gs = LOWORD(GS_sig(sigcontext));
717#else
718 gs = wine_get_gs();
719#endif
720
0f95d549 721 stack = init_handler( sigcontext );
4cb00196
AJ
722
723 /* stack sanity checks */
724
0f95d549
AJ
725 if ((char *)stack >= (char *)get_signal_stack() &&
726 (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
4cb00196
AJ
727 {
728 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
729 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
730 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
4dba172e 731 server_abort_thread(1);
4cb00196
AJ
732 }
733
7924f421 734 if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
4cb00196
AJ
735 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
736 {
7924f421 737 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
4cb00196 738 if (diff < 4096)
7924f421 739 {
4cb00196
AJ
740 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
741 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
742 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
4dba172e 743 server_abort_thread(1);
7924f421
AJ
744 }
745 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
746 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
747 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
4cb00196
AJ
748 }
749
750 stack--; /* push the stack_layout structure */
751 stack->ret_addr = __wine_call_from_32_restore_regs;
752 stack->rec_ptr = &stack->rec;
753 stack->context_ptr = &stack->context;
754
755 stack->rec.ExceptionRecord = NULL;
756 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
757 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
758 stack->rec.NumberParameters = 0;
759
760 stack->context.ContextFlags = CONTEXT_FULL;
761 stack->context.Eax = EAX_sig(sigcontext);
762 stack->context.Ebx = EBX_sig(sigcontext);
763 stack->context.Ecx = ECX_sig(sigcontext);
764 stack->context.Edx = EDX_sig(sigcontext);
765 stack->context.Esi = ESI_sig(sigcontext);
766 stack->context.Edi = EDI_sig(sigcontext);
767 stack->context.Ebp = EBP_sig(sigcontext);
768 stack->context.EFlags = EFL_sig(sigcontext);
769 stack->context.Eip = EIP_sig(sigcontext);
770 stack->context.Esp = ESP_sig(sigcontext);
771 stack->context.SegCs = LOWORD(CS_sig(sigcontext));
772 stack->context.SegDs = LOWORD(DS_sig(sigcontext));
773 stack->context.SegEs = LOWORD(ES_sig(sigcontext));
774 stack->context.SegFs = fs;
775 stack->context.SegGs = gs;
776 stack->context.SegSs = LOWORD(SS_sig(sigcontext));
777
778 /* now modify the sigcontext to return to the raise function */
779 ESP_sig(sigcontext) = (DWORD)stack;
780 EIP_sig(sigcontext) = (DWORD)func;
781 CS_sig(sigcontext) = wine_get_cs();
782 DS_sig(sigcontext) = wine_get_ds();
783 ES_sig(sigcontext) = wine_get_es();
784 FS_sig(sigcontext) = wine_get_fs();
785 GS_sig(sigcontext) = wine_get_gs();
786 SS_sig(sigcontext) = wine_get_ss();
787
788 return stack->rec_ptr;
789}
790
791
792/***********************************************************************
793 * get_exception_context
794 *
795 * Get a pointer to the context built by setup_exception.
796 */
797static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
798{
799 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
800}
801
802
3d06d20b
AJ
803/**********************************************************************
804 * get_fpu_code
805 *
806 * Get the FPU exception code from the FPU status.
807 */
808static inline DWORD get_fpu_code( const CONTEXT *context )
809{
810 DWORD status = context->FloatSave.StatusWord;
811
812 if (status & 0x01) /* IE */
813 {
814 if (status & 0x40) /* SF */
815 return EXCEPTION_FLT_STACK_CHECK;
816 else
817 return EXCEPTION_FLT_INVALID_OPERATION;
818 }
819 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
820 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
821 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
822 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
823 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
824 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
825}
826
827
828/**********************************************************************
4cb00196 829 * raise_segv_exception
3d06d20b 830 */
4cb00196 831static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
3d06d20b 832{
4cb00196 833 switch(rec->ExceptionCode)
3d06d20b 834 {
4cb00196
AJ
835 case EXCEPTION_ACCESS_VIOLATION:
836 if (rec->NumberParameters == 2)
837 {
838 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
839 return;
840 }
3d06d20b 841 break;
4cb00196 842 case EXCEPTION_DATATYPE_MISALIGNMENT:
3d06d20b 843 /* FIXME: pass through exception handler first? */
45b2c868 844 if (context->EFlags & 0x00040000)
3d06d20b
AJ
845 {
846 /* Disable AC flag, return */
45b2c868
AJ
847 context->EFlags &= ~0x00040000;
848 return;
849 }
3d06d20b
AJ
850 break;
851 }
4cb00196 852 EXC_RtlRaiseException( rec, context );
3d06d20b
AJ
853}
854
855
856/**********************************************************************
4cb00196 857 * raise_trap_exception
3d06d20b 858 */
4cb00196 859static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
3d06d20b 860{
a993df86 861 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
3d06d20b 862
4cb00196 863 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
de5e1af2 864 {
0d588a4a
EP
865 if (context->EFlags & 0x100)
866 {
0d588a4a
EP
867 context->EFlags &= ~0x100; /* clear single-step flag */
868 }
a993df86 869 else /* hardware breakpoint, fetch the debug registers */
0d588a4a 870 {
a993df86 871 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
088bcf9c 872 NtGetContextThread(GetCurrentThread(), context);
8638b264
EP
873 /* do we really have a bp from a debug register ?
874 * if not, then someone did a kill(SIGTRAP) on us, and we
875 * shall return a breakpoint, not a single step exception
876 */
4cb00196 877 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
0d588a4a 878 }
de5e1af2 879 }
4cb00196 880
a993df86
AJ
881 dr0 = context->Dr0;
882 dr1 = context->Dr1;
883 dr2 = context->Dr2;
884 dr3 = context->Dr3;
885 dr6 = context->Dr6;
886 dr7 = context->Dr7;
887
4cb00196 888 EXC_RtlRaiseException( rec, context );
a993df86
AJ
889
890 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
891 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
892 {
893 /* the debug registers have changed, set the new values */
894 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
088bcf9c 895 NtSetContextThread(GetCurrentThread(), context);
a993df86 896 }
3d06d20b
AJ
897}
898
899
900/**********************************************************************
4cb00196 901 * raise_fpu_exception
3d06d20b 902 */
4cb00196 903static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
3d06d20b 904{
4cb00196
AJ
905 EXC_RtlRaiseException( rec, context );
906 restore_fpu( context );
45b2c868
AJ
907}
908
909
a274dd91 910#ifdef __HAVE_VM86
6e33f63e 911/**********************************************************************
063cff86 912 * raise_vm86_sti_exception
6e33f63e 913 */
063cff86 914static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
6e33f63e 915{
d7ee5f3f 916 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
063cff86
AJ
917 NtCurrentTeb()->vm86_pending |= VIP_MASK;
918
d7ee5f3f 919 if (NtCurrentTeb()->vm86_ptr)
6e33f63e 920 {
4eb0bebd
OK
921 if (((char*)context->Eip >= (char*)vm86_return) &&
922 ((char*)context->Eip <= (char*)vm86_return_end) &&
923 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
924 /* exiting from VM86, can't throw */
925 return;
926 }
d7ee5f3f 927 merge_vm86_pending_flags( rec );
6e33f63e 928 }
063cff86 929 else if (NtCurrentTeb()->dpmi_vif &&
8fb98a41
AJ
930 !wine_ldt_is_system(context->SegCs) &&
931 !wine_ldt_is_system(context->SegSs))
063cff86
AJ
932 {
933 /* Executing DPMI code and virtual interrupts are enabled. */
934 NtCurrentTeb()->vm86_pending = 0;
935 EXC_RtlRaiseException( rec, context );
936 }
6e33f63e
OK
937}
938
939
7f862cb2
AJ
940/**********************************************************************
941 * usr2_handler
942 *
943 * Handler for SIGUSR2.
944 * We use it to signal that the running __wine_enter_vm86() should
945 * immediately set VIP_MASK, causing pending events to be handled
946 * as early as possible.
947 */
948static HANDLER_DEF(usr2_handler)
949{
063cff86
AJ
950 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
951 rec->ExceptionCode = EXCEPTION_VM86_STI;
7f862cb2 952}
a274dd91 953#endif /* __HAVE_VM86 */
7f862cb2
AJ
954
955
45b2c868
AJ
956/**********************************************************************
957 * segv_handler
958 *
959 * Handler for SIGSEGV and related errors.
960 */
961static HANDLER_DEF(segv_handler)
962{
4cb00196 963 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
ebe67a28 964
4cb00196
AJ
965 switch(get_trap_code(HANDLER_CONTEXT))
966 {
967 case T_OFLOW: /* Overflow exception */
968 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
969 break;
970 case T_BOUND: /* Bound range exception */
971 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
972 break;
973 case T_PRIVINFLT: /* Invalid opcode exception */
974 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
975 break;
976 case T_STKFLT: /* Stack fault */
977 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
978 break;
979 case T_SEGNPFLT: /* Segment not present exception */
980 case T_PROTFLT: /* General protection fault */
981 case T_UNKNOWN: /* Unknown fault code */
982 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
983 : EXCEPTION_PRIV_INSTRUCTION;
984 break;
985 case T_PAGEFLT: /* Page fault */
986 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
ebe67a28 987#ifdef FAULT_ADDRESS
4cb00196
AJ
988 rec->NumberParameters = 2;
989 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
990 rec->ExceptionInformation[1] = (DWORD)FAULT_ADDRESS;
ebe67a28 991#endif
4cb00196
AJ
992 break;
993 case T_ALIGNFLT: /* Alignment check exception */
994 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
995 break;
996 default:
997 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
998 /* fall through */
999 case T_NMI: /* NMI interrupt */
1000 case T_DNA: /* Device not available exception */
1001 case T_DOUBLEFLT: /* Double fault exception */
1002 case T_TSSFLT: /* Invalid TSS exception */
1003 case T_RESERVED: /* Unknown exception */
1004 case T_MCHK: /* Machine check exception */
1005#ifdef T_CACHEFLT
1006 case T_CACHEFLT: /* Cache flush exception */
1007#endif
1008 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1009 break;
1010 }
45b2c868
AJ
1011}
1012
1013
1014/**********************************************************************
1015 * trap_handler
1016 *
1017 * Handler for SIGTRAP.
1018 */
1019static HANDLER_DEF(trap_handler)
1020{
4cb00196
AJ
1021 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1022
1023 switch(get_trap_code(HANDLER_CONTEXT))
1024 {
1025 case T_TRCTRAP: /* Single-step exception */
1026 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1027 EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */
1028 break;
1029 case T_BPTFLT: /* Breakpoint exception */
1030 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1031 /* fall through */
1032 default:
1033 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1034 break;
1035 }
45b2c868
AJ
1036}
1037
1038
1039/**********************************************************************
1040 * fpe_handler
1041 *
1042 * Handler for SIGFPE.
1043 */
1044static HANDLER_DEF(fpe_handler)
1045{
4cb00196
AJ
1046 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1047 CONTEXT *context;
1048
1049 context = get_exception_context( rec );
1050 save_fpu( context, HANDLER_CONTEXT );
1051
1052 switch(get_trap_code(HANDLER_CONTEXT))
1053 {
1054 case T_DIVIDE: /* Division by zero exception */
1055 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1056 break;
1057 case T_FPOPFLT: /* Coprocessor segment overrun */
1058 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1059 break;
1060 case T_ARITHTRAP: /* Floating point exception */
1061 case T_UNKNOWN: /* Unknown fault code */
1062 rec->ExceptionCode = get_fpu_code( context );
1063 break;
1064 default:
1065 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1066 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1067 break;
1068 }
3d06d20b
AJ
1069}
1070
1071
1072/**********************************************************************
1073 * int_handler
1074 *
1075 * Handler for SIGINT.
1076 */
1077static HANDLER_DEF(int_handler)
1078{
d04ccb8e 1079 init_handler( HANDLER_CONTEXT );
3d4d7e01 1080 if (!dispatch_signal(SIGINT))
93bfa0d6 1081 {
4cb00196
AJ
1082 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1083 rec->ExceptionCode = CONTROL_C_EXIT;
93bfa0d6 1084 }
3d06d20b
AJ
1085}
1086
bdb44555
LU
1087/**********************************************************************
1088 * abrt_handler
1089 *
1090 * Handler for SIGABRT.
1091 */
1092static HANDLER_DEF(abrt_handler)
1093{
4cb00196
AJ
1094 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1095 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1096 rec->ExceptionFlags = EH_NONCONTINUABLE;
bdb44555
LU
1097}
1098
3d06d20b 1099
6a26e3f7
AJ
1100/**********************************************************************
1101 * term_handler
1102 *
1103 * Handler for SIGTERM.
1104 */
1105static HANDLER_DEF(term_handler)
1106{
1107 init_handler( HANDLER_CONTEXT );
4dba172e 1108 server_abort_thread(0);
6a26e3f7
AJ
1109}
1110
1111
d04ccb8e
AJ
1112/**********************************************************************
1113 * usr1_handler
1114 *
1115 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1116 */
1117static HANDLER_DEF(usr1_handler)
1118{
14d04b60
EP
1119 LARGE_INTEGER timeout;
1120
d04ccb8e
AJ
1121 init_handler( HANDLER_CONTEXT );
1122 /* wait with 0 timeout, will only return once the thread is no longer suspended */
14d04b60 1123 timeout.QuadPart = 0;
217fdab7 1124 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
d04ccb8e
AJ
1125}
1126
1127
3d06d20b
AJ
1128/***********************************************************************
1129 * set_handler
1130 *
1131 * Set a signal handler
1132 */
0045def7 1133static int set_handler( int sig, int have_sigaltstack, void (*func)() )
3d06d20b 1134{
3d06d20b 1135 struct sigaction sig_act;
0045def7
AJ
1136
1137#ifdef linux
8824c38e 1138 if (!have_sigaltstack)
0045def7
AJ
1139 {
1140 struct kernel_sigaction sig_act;
1141 sig_act.ksa_handler = func;
e4a98ec1
OK
1142 sig_act.ksa_flags = SA_RESTART;
1143 sig_act.ksa_mask = (1 << (SIGINT-1)) |
ae906923 1144 (1 << (SIGUSR2-1));
8824c38e 1145 /* point to the top of the signal stack */
0f95d549 1146 sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
0045def7
AJ
1147 return wine_sigaction( sig, &sig_act, NULL );
1148 }
1149#endif /* linux */
3d06d20b
AJ
1150 sig_act.sa_handler = func;
1151 sigemptyset( &sig_act.sa_mask );
e4a98ec1 1152 sigaddset( &sig_act.sa_mask, SIGINT );
bbb7dc0f 1153 sigaddset( &sig_act.sa_mask, SIGUSR2 );
3d06d20b 1154
c2de5fbc 1155#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
e4a98ec1 1156 sig_act.sa_flags = SA_RESTART;
0045def7
AJ
1157#elif defined (__svr4__) || defined(_SCO_DS)
1158 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1159#else
3d06d20b 1160 sig_act.sa_flags = 0;
0045def7
AJ
1161#endif
1162
1163#ifdef SA_ONSTACK
1164 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1165#endif
3d06d20b 1166 return sigaction( sig, &sig_act, NULL );
3d06d20b
AJ
1167}
1168
1169
3d4d7e01
EP
1170/***********************************************************************
1171 * __wine_set_signal_handler (NTDLL.@)
1172 */
4325554a 1173int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
3d4d7e01
EP
1174{
1175 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1176 if (handlers[sig] != NULL) return -2;
1177 handlers[sig] = wsh;
1178 return 0;
1179}
1180
1181
3d06d20b
AJ
1182/**********************************************************************
1183 * SIGNAL_Init
1184 */
1185BOOL SIGNAL_Init(void)
1186{
0045def7
AJ
1187 int have_sigaltstack = 0;
1188
1189#ifdef HAVE_SIGALTSTACK
3d06d20b 1190 struct sigaltstack ss;
0f95d549 1191 ss.ss_sp = get_signal_stack();
8824c38e
AJ
1192 ss.ss_size = SIGNAL_STACK_SIZE;
1193 ss.ss_flags = 0;
1194 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
0045def7 1195#ifdef linux
8824c38e
AJ
1196 /* sigaltstack may fail because the kernel is too old, or
1197 because glibc is brain-dead. In the latter case a
1198 direct system call should succeed. */
1199 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
0045def7 1200#endif /* linux */
3d06d20b 1201#endif /* HAVE_SIGALTSTACK */
e4a98ec1 1202
0045def7
AJ
1203 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1204 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1205 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1206 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
bdb44555 1207 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
6a26e3f7 1208 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
d04ccb8e 1209 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
3d06d20b 1210#ifdef SIGBUS
0045def7 1211 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
3d06d20b
AJ
1212#endif
1213#ifdef SIGTRAP
0045def7 1214 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
3d06d20b 1215#endif
7f862cb2 1216
a274dd91 1217#ifdef __HAVE_VM86
6e33f63e 1218 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
7f862cb2
AJ
1219#endif
1220
3d06d20b
AJ
1221 return TRUE;
1222
1223 error:
1224 perror("sigaction");
1225 return FALSE;
1226}
1227
45b2c868 1228
a274dd91 1229#ifdef __HAVE_VM86
45b2c868 1230/**********************************************************************
a62a26ce 1231 * __wine_enter_vm86 (NTDLL.@)
45b2c868
AJ
1232 *
1233 * Enter vm86 mode with the specified register context.
1234 */
1235void __wine_enter_vm86( CONTEXT *context )
1236{
1237 EXCEPTION_RECORD rec;
6e33f63e 1238 TEB *teb = NtCurrentTeb();
45b2c868
AJ
1239 int res;
1240 struct vm86plus_struct vm86;
1241
b59627c8 1242 memset( &vm86, 0, sizeof(vm86) );
45b2c868
AJ
1243 for (;;)
1244 {
0b6c6e76 1245 restore_vm86_context( context, &vm86 );
4cb00196 1246
d7ee5f3f
JH
1247 teb->vm86_ptr = &vm86;
1248 merge_vm86_pending_flags( &rec );
45b2c868 1249
d7ee5f3f
JH
1250 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1251 if (res < 0)
b59627c8 1252 {
d7ee5f3f
JH
1253 errno = -res;
1254 return;
1255 }
45b2c868 1256
0b6c6e76 1257 save_vm86_context( context, &vm86 );
45b2c868 1258
4cb00196
AJ
1259 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1260 rec.ExceptionRecord = NULL;
1261 rec.ExceptionAddress = (LPVOID)context->Eip;
1262 rec.NumberParameters = 0;
1263
45b2c868
AJ
1264 switch(VM86_TYPE(res))
1265 {
45b2c868 1266 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
4cb00196
AJ
1267 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1268 raise_segv_exception( &rec, context );
45b2c868
AJ
1269 continue;
1270 case VM86_TRAP: /* return due to DOS-debugger request */
4cb00196
AJ
1271 switch(VM86_ARG(res))
1272 {
1273 case T_TRCTRAP: /* Single-step exception */
1274 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1275 context->EFlags &= ~0x100; /* clear single-step flag */
1276 break;
1277 case T_BPTFLT: /* Breakpoint exception */
1278 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1279 /* fall through */
1280 default:
1281 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1282 break;
1283 }
1284 raise_trap_exception( &rec, context );
45b2c868
AJ
1285 continue;
1286 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1287 rec.ExceptionCode = EXCEPTION_VM86_INTx;
4cb00196
AJ
1288 rec.NumberParameters = 1;
1289 rec.ExceptionInformation[0] = VM86_ARG(res);
45b2c868
AJ
1290 break;
1291 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
d7ee5f3f
JH
1292 context->EFlags |= VIF_MASK;
1293 context->EFlags &= ~VIP_MASK;
6e33f63e 1294 teb->vm86_pending = 0;
45b2c868
AJ
1295 rec.ExceptionCode = EXCEPTION_VM86_STI;
1296 break;
1297 case VM86_PICRETURN: /* return due to pending PIC request */
1298 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1299 break;
d7ee5f3f 1300 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
45b2c868
AJ
1301 default:
1302 ERR( "unhandled result from vm86 mode %x\n", res );
1303 continue;
1304 }
45b2c868
AJ
1305 EXC_RtlRaiseException( &rec, context );
1306 }
1307}
1308
a274dd91 1309#else /* __HAVE_VM86 */
a62a26ce
PS
1310/**********************************************************************
1311 * __wine_enter_vm86 (NTDLL.@)
1312 */
45b2c868
AJ
1313void __wine_enter_vm86( CONTEXT *context )
1314{
1315 MESSAGE("vm86 mode not supported on this platform\n");
1316}
a274dd91 1317#endif /* __HAVE_VM86 */
45b2c868 1318
7d0dd5f3 1319/**********************************************************************
3ca98239 1320 * DbgBreakPoint (NTDLL.@)
7d0dd5f3 1321 */
d628f436 1322__ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
7d0dd5f3
AJ
1323
1324/**********************************************************************
3ca98239 1325 * DbgUserBreakPoint (NTDLL.@)
7d0dd5f3 1326 */
d628f436 1327__ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
7d0dd5f3 1328
3d06d20b 1329#endif /* __i386__ */