2 * i386 signal handling routines
4 * Copyright 1999 Alexandre Julliard
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.
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.
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
24 #include "wine/port.h"
31 #include <sys/types.h>
36 #ifdef HAVE_SYS_PARAM_H
37 # include <sys/param.h>
42 # ifdef HAVE_SYS_SYSCALL_H
43 # include <sys/syscall.h>
47 #ifdef HAVE_SYS_VM86_H
48 # include <sys/vm86.h>
51 #ifdef HAVE_SYS_SIGNAL_H
52 # include <sys/signal.h>
54 #ifdef HAVE_SYS_SYSCTL_H
55 # include <sys/sysctl.h>
59 #include "wine/library.h"
60 #include "ntdll_misc.h"
61 #include "wine/exception.h"
62 #include "wine/debug.h"
64 #ifdef HAVE_VALGRIND_MEMCHECK_H
65 #include <valgrind/memcheck.h>
68 #undef ERR /* Solaris needs to define this */
70 /* not defined for x86, so copy the x86_64 definition */
71 typedef struct DECLSPEC_ALIGN(16) _M128A
92 M128A FloatRegisters[8];
93 M128A XmmRegisters[16];
97 /***********************************************************************
98 * signal context platform-specific definitions
103 typedef ucontext_t SIGCONTEXT;
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])
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])
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])
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)
129 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
130 #define VIF_FLAG 0x00080000
131 #define VIP_FLAG 0x00100000
133 int vm86_enter( void **vm86_ptr );
134 void vm86_return(void);
135 void vm86_return_end(void);
136 __ASM_GLOBAL_FUNC(vm86_enter,
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"
143 "movl $1,%ebx\n\t" /*VM86_ENTER*/
144 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
148 ".globl " __ASM_NAME("vm86_return") "\n\t"
149 __ASM_FUNC("vm86_return") "\n"
150 __ASM_NAME("vm86_return") ":\n\t"
156 "testl %eax,%eax\n\t"
158 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
159 "je " __ASM_NAME("vm86_enter") "\n\t"
161 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
163 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
164 __ASM_FUNC("vm86_return_end") "\n"
165 __ASM_NAME("vm86_return_end") ":\n\t"
168 #ifdef HAVE_SYS_VM86_H
176 #include <machine/frame.h>
177 typedef struct trapframe SIGCONTEXT;
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)
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)
192 #define EFL_sig(context) ((context)->tf_eflags)
194 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
195 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
197 #define FPU_sig(context) NULL /* FIXME */
198 #define FPUX_sig(context) NULL /* FIXME */
202 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
204 typedef struct sigcontext SIGCONTEXT;
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)
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)
221 #define TRAP_sig(context) ((context)->sc_trapno)
222 #define ERROR_sig(context) ((context)->sc_err)
223 #define EFL_sig(context) ((context)->sc_eflags)
225 #define EIP_sig(context) ((context)->sc_eip)
226 #define ESP_sig(context) ((context)->sc_esp)
228 #define FPU_sig(context) NULL /* FIXME */
229 #define FPUX_sig(context) NULL /* FIXME */
233 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
236 #include <sys/regset.h>
238 #include <sys/ucontext.h>
239 typedef struct ucontext SIGCONTEXT;
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])
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])
258 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
259 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
261 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
263 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
265 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
267 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
269 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
272 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR])
275 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
278 #define FPU_sig(context) NULL /* FIXME */
279 #define FPUX_sig(context) NULL /* FIXME */
281 #endif /* svr4 || SCO_DS */
284 # include <sys/ucontext.h>
286 typedef ucontext_t SIGCONTEXT;
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)
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)
333 #endif /* __APPLE__ */
335 WINE_DEFAULT_DEBUG_CHANNEL(seh);
337 typedef int (*wine_signal_handler)(unsigned int sig);
339 static size_t signal_stack_mask;
340 static size_t signal_stack_size;
342 static wine_signal_handler handlers[256];
344 static int fpux_support; /* whether the CPU support extended fpu context */
346 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
350 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
351 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
352 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
353 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
354 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
355 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
356 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
357 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
358 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
359 TRAP_x86_DNA = T_DNA, /* Device not available exception */
360 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
361 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
362 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
363 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
364 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
365 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
366 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
367 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
368 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
369 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
370 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
372 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
373 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
374 TRAP_x86_NMI = 2, /* NMI interrupt */
375 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
376 TRAP_x86_OFLOW = 4, /* Overflow exception */
377 TRAP_x86_BOUND = 5, /* Bound range exception */
378 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
379 TRAP_x86_DNA = 7, /* Device not available exception */
380 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
381 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
382 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
383 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
384 TRAP_x86_STKFLT = 12, /* Stack fault */
385 TRAP_x86_PROTFLT = 13, /* General protection fault */
386 TRAP_x86_PAGEFLT = 14, /* Page fault */
387 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
388 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
389 TRAP_x86_MCHK = 18, /* Machine check exception */
390 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
391 otherwise Cache flush exception (via SIGSEV) */
396 /***********************************************************************
399 static inline int dispatch_signal(unsigned int sig)
401 if (handlers[sig] == NULL) return 0;
402 return handlers[sig](sig);
406 /***********************************************************************
409 * Get the trap code for a signal.
411 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
414 return TRAP_sig(sigcontext);
416 return TRAP_x86_UNKNOWN; /* unknown trap code */
420 /***********************************************************************
423 * Get the error code for a signal.
425 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
428 return ERROR_sig(sigcontext);
434 /***********************************************************************
437 * Get the base of the signal stack for the current thread.
439 static inline void *get_signal_stack(void)
441 return (char *)NtCurrentTeb() + 4096;
445 /***********************************************************************
448 * Get the current teb based on the stack pointer.
450 static inline TEB *get_current_teb(void)
453 __asm__("movl %%esp,%0" : "=g" (esp) );
454 return (TEB *)(esp & ~signal_stack_mask);
459 /***********************************************************************
462 * Set the register values from a vm86 structure.
464 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
466 context->ContextFlags = CONTEXT_FULL;
467 context->Eax = vm86->regs.eax;
468 context->Ebx = vm86->regs.ebx;
469 context->Ecx = vm86->regs.ecx;
470 context->Edx = vm86->regs.edx;
471 context->Esi = vm86->regs.esi;
472 context->Edi = vm86->regs.edi;
473 context->Esp = vm86->regs.esp;
474 context->Ebp = vm86->regs.ebp;
475 context->Eip = vm86->regs.eip;
476 context->SegCs = vm86->regs.cs;
477 context->SegDs = vm86->regs.ds;
478 context->SegEs = vm86->regs.es;
479 context->SegFs = vm86->regs.fs;
480 context->SegGs = vm86->regs.gs;
481 context->SegSs = vm86->regs.ss;
482 context->EFlags = vm86->regs.eflags;
486 /***********************************************************************
487 * restore_vm86_context
489 * Build a vm86 structure from the register values.
491 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
493 vm86->regs.eax = context->Eax;
494 vm86->regs.ebx = context->Ebx;
495 vm86->regs.ecx = context->Ecx;
496 vm86->regs.edx = context->Edx;
497 vm86->regs.esi = context->Esi;
498 vm86->regs.edi = context->Edi;
499 vm86->regs.esp = context->Esp;
500 vm86->regs.ebp = context->Ebp;
501 vm86->regs.eip = context->Eip;
502 vm86->regs.cs = context->SegCs;
503 vm86->regs.ds = context->SegDs;
504 vm86->regs.es = context->SegEs;
505 vm86->regs.fs = context->SegFs;
506 vm86->regs.gs = context->SegGs;
507 vm86->regs.ss = context->SegSs;
508 vm86->regs.eflags = context->EFlags;
512 /**********************************************************************
513 * merge_vm86_pending_flags
515 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
516 * raises exception if there are pending events and VIF flag
517 * has been turned on.
519 * Called from __wine_enter_vm86 because vm86_enter
520 * doesn't check for pending events.
522 * Called from raise_vm86_sti_exception to check for
523 * pending events in a signal safe way.
525 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
527 BOOL check_pending = TRUE;
528 struct vm86plus_struct *vm86 =
529 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
532 * In order to prevent a race when SIGUSR2 occurs while
533 * we are returning from exception handler, pending events
534 * will be rechecked after each raised exception.
536 while (check_pending && get_vm86_teb_info()->vm86_pending)
538 check_pending = FALSE;
539 ntdll_get_thread_data()->vm86_ptr = NULL;
542 * If VIF is set, throw exception.
543 * Note that SIGUSR2 may turn VIF flag off so
544 * VIF check must occur only when TEB.vm86_ptr is NULL.
546 if (vm86->regs.eflags & VIF_FLAG)
549 save_vm86_context( &vcontext, vm86 );
551 rec->ExceptionCode = EXCEPTION_VM86_STI;
552 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
553 rec->ExceptionRecord = NULL;
554 rec->NumberParameters = 0;
555 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
557 vcontext.EFlags &= ~VIP_FLAG;
558 get_vm86_teb_info()->vm86_pending = 0;
559 __regs_RtlRaiseException( rec, &vcontext );
561 restore_vm86_context( &vcontext, vm86 );
562 check_pending = TRUE;
565 ntdll_get_thread_data()->vm86_ptr = vm86;
569 * Merge VIP flags in a signal safe way. This requires
570 * that the following operation compiles into atomic
573 vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
575 #endif /* __HAVE_VM86 */
578 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
581 /***********************************************************************
584 * Handler initialization when the full context is not needed.
586 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
588 void *stack = (void *)(ESP_sig(sigcontext) & ~3);
589 TEB *teb = get_current_teb();
590 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
592 /* get %fs and %gs at time of the fault */
594 *fs = LOWORD(FS_sig(sigcontext));
599 *gs = LOWORD(GS_sig(sigcontext));
604 wine_set_fs( thread_data->fs );
606 /* now restore a proper %gs for the fault handler */
607 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
608 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
611 * Win16 or DOS protected mode. Note that during switch
612 * from 16-bit mode to linear mode, CS may be set to system
613 * segment before FS is restored. Fortunately, in this case
614 * SS is still non-system segment. This is why both CS and SS
617 wine_set_gs( thread_data->gs );
618 stack = teb->WOW32Reserved;
621 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
623 unsigned int *int_stack = stack;
624 /* fetch the saved %gs from the stack */
625 wine_set_gs( int_stack[0] );
628 else /* 32-bit mode */
631 wine_set_gs( GS_sig(sigcontext) );
638 /***********************************************************************
641 * Save the thread FPU context.
643 static inline void save_fpu( CONTEXT *context )
646 context->ContextFlags |= CONTEXT_FLOATING_POINT;
647 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
652 /***********************************************************************
655 * Save the thread FPU extended context.
657 static inline void save_fpux( CONTEXT *context )
660 /* we have to enforce alignment by hand */
661 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
662 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
664 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
665 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
666 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
671 /***********************************************************************
674 * Restore the FPU context to a sigcontext.
676 static inline void restore_fpu( const CONTEXT *context )
678 FLOATING_SAVE_AREA float_status = context->FloatSave;
679 /* reset the current interrupt status */
680 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
682 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
683 #endif /* __GNUC__ */
687 /***********************************************************************
690 * Restore the FPU extended context to a sigcontext.
692 static inline void restore_fpux( const CONTEXT *context )
695 /* we have to enforce alignment by hand */
696 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
697 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
699 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
700 /* reset the current interrupt status */
701 state->StatusWord &= state->ControlWord | 0xff80;
702 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
707 /***********************************************************************
710 * Build a standard FPU context from an extended one.
712 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
714 unsigned int i, tag, stack_top;
716 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
717 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
718 fpu->ErrorOffset = fpux->ErrorOffset;
719 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
720 fpu->DataOffset = fpux->DataOffset;
721 fpu->DataSelector = fpux->DataSelector;
722 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
724 stack_top = (fpux->StatusWord >> 11) & 7;
725 fpu->TagWord = 0xffff0000;
726 for (i = 0; i < 8; i++)
728 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
729 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
732 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
733 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
735 tag = 2; /* special */
737 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
739 if (reg->Low) tag = 2; /* special */
740 else tag = 1; /* zero */
744 if (reg->Low >> 63) tag = 0; /* valid */
745 else tag = 2; /* special */
748 fpu->TagWord |= tag << (2 * i);
753 /***********************************************************************
756 * Build a context structure from the signal info.
758 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
760 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
761 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
762 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
764 memset(context, 0, sizeof(*context));
765 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
766 context->Eax = EAX_sig(sigcontext);
767 context->Ebx = EBX_sig(sigcontext);
768 context->Ecx = ECX_sig(sigcontext);
769 context->Edx = EDX_sig(sigcontext);
770 context->Esi = ESI_sig(sigcontext);
771 context->Edi = EDI_sig(sigcontext);
772 context->Ebp = EBP_sig(sigcontext);
773 context->EFlags = EFL_sig(sigcontext);
774 context->Eip = EIP_sig(sigcontext);
775 context->Esp = ESP_sig(sigcontext);
776 context->SegCs = LOWORD(CS_sig(sigcontext));
777 context->SegDs = LOWORD(DS_sig(sigcontext));
778 context->SegEs = LOWORD(ES_sig(sigcontext));
781 context->SegSs = LOWORD(SS_sig(sigcontext));
782 context->Dr0 = regs->dr0;
783 context->Dr1 = regs->dr1;
784 context->Dr2 = regs->dr2;
785 context->Dr3 = regs->dr3;
786 context->Dr6 = regs->dr6;
787 context->Dr7 = regs->dr7;
791 context->ContextFlags |= CONTEXT_FLOATING_POINT;
792 context->FloatSave = *fpu;
796 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
797 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
799 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
801 if (!fpu && !fpux) save_fpu( context );
805 /***********************************************************************
808 * Restore the signal info from the context.
810 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
812 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
813 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
814 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
816 regs->dr0 = context->Dr0;
817 regs->dr1 = context->Dr1;
818 regs->dr2 = context->Dr2;
819 regs->dr3 = context->Dr3;
820 regs->dr6 = context->Dr6;
821 regs->dr7 = context->Dr7;
822 EAX_sig(sigcontext) = context->Eax;
823 EBX_sig(sigcontext) = context->Ebx;
824 ECX_sig(sigcontext) = context->Ecx;
825 EDX_sig(sigcontext) = context->Edx;
826 ESI_sig(sigcontext) = context->Esi;
827 EDI_sig(sigcontext) = context->Edi;
828 EBP_sig(sigcontext) = context->Ebp;
829 EFL_sig(sigcontext) = context->EFlags;
830 EIP_sig(sigcontext) = context->Eip;
831 ESP_sig(sigcontext) = context->Esp;
832 CS_sig(sigcontext) = context->SegCs;
833 DS_sig(sigcontext) = context->SegDs;
834 ES_sig(sigcontext) = context->SegEs;
835 SS_sig(sigcontext) = context->SegSs;
837 GS_sig(sigcontext) = context->SegGs;
839 wine_set_gs( context->SegGs );
842 FS_sig(sigcontext) = context->SegFs;
844 wine_set_fs( context->SegFs );
847 if (fpu) *fpu = context->FloatSave;
848 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
849 if (!fpu && !fpux) restore_fpu( context );
853 /***********************************************************************
856 * Register function to get the context of the current thread.
858 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
861 if (fpux_support) save_fpux( context );
862 else save_fpu( context );
864 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 )
867 /***********************************************************************
870 * Set the new CPU context. Used by NtSetContextThread.
872 void set_cpu_context( const CONTEXT *context )
874 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
876 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
877 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
879 if (flags & CONTEXT_DEBUG_REGISTERS)
881 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
882 regs->dr0 = context->Dr0;
883 regs->dr1 = context->Dr1;
884 regs->dr2 = context->Dr2;
885 regs->dr3 = context->Dr3;
886 regs->dr6 = context->Dr6;
887 regs->dr7 = context->Dr7;
889 if (flags & CONTEXT_FULL)
891 if (!(flags & CONTEXT_CONTROL))
892 FIXME( "setting partial context (%x) not supported\n", flags );
893 else if (flags & CONTEXT_SEGMENTS)
894 __wine_call_from_32_restore_regs( context );
897 CONTEXT newcontext = *context;
898 newcontext.SegDs = wine_get_ds();
899 newcontext.SegEs = wine_get_es();
900 newcontext.SegFs = wine_get_fs();
901 newcontext.SegGs = wine_get_gs();
902 __wine_call_from_32_restore_regs( &newcontext );
908 /***********************************************************************
909 * is_privileged_instr
911 * Check if the fault location is a privileged instruction.
912 * Based on the instruction emulation code in dlls/kernel/instr.c.
914 static inline DWORD is_privileged_instr( CONTEXT86 *context )
917 unsigned int prefix_count = 0;
919 if (!wine_ldt_is_system( context->SegCs )) return 0;
920 instr = (BYTE *)context->Eip;
922 for (;;) switch(*instr)
924 /* instruction prefixes */
925 case 0x2e: /* %cs: */
926 case 0x36: /* %ss: */
927 case 0x3e: /* %ds: */
928 case 0x26: /* %es: */
929 case 0x64: /* %fs: */
930 case 0x65: /* %gs: */
931 case 0x66: /* opcode size */
932 case 0x67: /* addr size */
933 case 0xf0: /* lock */
934 case 0xf2: /* repne */
935 case 0xf3: /* repe */
936 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
940 case 0x0f: /* extended instruction */
943 case 0x20: /* mov crX, reg */
944 case 0x21: /* mov drX, reg */
945 case 0x22: /* mov reg, crX */
946 case 0x23: /* mov reg drX */
947 return EXCEPTION_PRIV_INSTRUCTION;
950 case 0x6c: /* insb (%dx) */
951 case 0x6d: /* insl (%dx) */
952 case 0x6e: /* outsb (%dx) */
953 case 0x6f: /* outsl (%dx) */
954 case 0xcd: /* int $xx */
955 case 0xe4: /* inb al,XX */
956 case 0xe5: /* in (e)ax,XX */
957 case 0xe6: /* outb XX,al */
958 case 0xe7: /* out XX,(e)ax */
959 case 0xec: /* inb (%dx),%al */
960 case 0xed: /* inl (%dx),%eax */
961 case 0xee: /* outb %al,(%dx) */
962 case 0xef: /* outl %eax,(%dx) */
966 return EXCEPTION_PRIV_INSTRUCTION;
973 #include "pshpack1.h"
976 DWORD movl; /* movl this,4(%esp) */
978 BYTE jmp; /* jmp func */
983 /**********************************************************************
986 * Check if code destination is an ATL thunk, and emulate it if so.
988 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
990 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
995 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
997 *((DWORD *)context->Esp + 1) = thunk->this;
998 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
999 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1000 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1013 /***********************************************************************
1014 * setup_exception_record
1016 * Setup the exception record and context on the thread stack.
1018 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1019 WORD fs, WORD gs, raise_func func )
1023 void *ret_addr; /* return address from raise_func */
1024 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1025 CONTEXT *context_ptr; /* second arg for raise_func */
1027 EXCEPTION_RECORD rec;
1030 } *stack = stack_ptr;
1031 DWORD exception_code = 0;
1033 /* stack sanity checks */
1035 if ((char *)stack >= (char *)get_signal_stack() &&
1036 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1038 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1039 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1040 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1041 NtCurrentTeb()->Tib.StackBase );
1042 server_abort_thread(1);
1045 if (stack - 1 > stack || /* check for overflow in subtraction */
1046 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1047 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1049 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1050 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1051 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1052 NtCurrentTeb()->Tib.StackBase );
1054 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1056 /* stack overflow on last page, unrecoverable */
1057 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1058 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1059 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1060 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1061 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1062 server_abort_thread(1);
1064 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1066 /* stack access below stack limit, may be recoverable */
1067 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1070 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1071 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1072 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1073 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1074 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1075 server_abort_thread(1);
1079 stack--; /* push the stack_layout structure */
1080 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1081 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1082 #elif defined(VALGRIND_MAKE_WRITABLE)
1083 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1085 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1086 stack->rec_ptr = &stack->rec;
1087 stack->context_ptr = &stack->context;
1089 stack->rec.ExceptionRecord = NULL;
1090 stack->rec.ExceptionCode = exception_code;
1091 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1092 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1093 stack->rec.NumberParameters = 0;
1095 save_context( &stack->context, sigcontext, fs, gs );
1097 /* now modify the sigcontext to return to the raise function */
1098 ESP_sig(sigcontext) = (DWORD)stack;
1099 EIP_sig(sigcontext) = (DWORD)func;
1100 /* clear single-step, direction, and align check flag */
1101 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1102 CS_sig(sigcontext) = wine_get_cs();
1103 DS_sig(sigcontext) = wine_get_ds();
1104 ES_sig(sigcontext) = wine_get_es();
1105 FS_sig(sigcontext) = wine_get_fs();
1106 GS_sig(sigcontext) = wine_get_gs();
1107 SS_sig(sigcontext) = wine_get_ss();
1109 return stack->rec_ptr;
1113 /***********************************************************************
1116 * Setup a proper stack frame for the raise function, and modify the
1117 * sigcontext so that the return from the signal handler will call
1118 * the raise function.
1120 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1123 void *stack = init_handler( sigcontext, &fs, &gs );
1125 return setup_exception_record( sigcontext, stack, fs, gs, func );
1129 /***********************************************************************
1130 * get_exception_context
1132 * Get a pointer to the context built by setup_exception.
1134 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1136 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1140 /**********************************************************************
1143 * Get the FPU exception code from the FPU status.
1145 static inline DWORD get_fpu_code( const CONTEXT *context )
1147 DWORD status = context->FloatSave.StatusWord;
1149 if (status & 0x01) /* IE */
1151 if (status & 0x40) /* SF */
1152 return EXCEPTION_FLT_STACK_CHECK;
1154 return EXCEPTION_FLT_INVALID_OPERATION;
1156 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1157 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1158 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1159 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1160 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1161 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1165 /**********************************************************************
1166 * raise_segv_exception
1168 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1170 switch(rec->ExceptionCode)
1172 case EXCEPTION_ACCESS_VIOLATION:
1173 if (rec->NumberParameters == 2)
1175 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1177 rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
1180 case EXCEPTION_DATATYPE_MISALIGNMENT:
1181 /* FIXME: pass through exception handler first? */
1182 if (context->EFlags & 0x00040000)
1184 /* Disable AC flag, return */
1185 context->EFlags &= ~0x00040000;
1190 __regs_RtlRaiseException( rec, context );
1192 NtSetContextThread( GetCurrentThread(), context );
1196 /**********************************************************************
1197 * raise_trap_exception
1199 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1201 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1203 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1205 /* when single stepping can't tell whether this is a hw bp or a
1206 * single step interrupt. try to avoid as much overhead as possible
1207 * and only do a server call if there is any hw bp enabled. */
1209 if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1211 /* (possible) hardware breakpoint, fetch the debug registers */
1212 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1213 NtGetContextThread(GetCurrentThread(), context);
1214 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1217 context->EFlags &= ~0x100; /* clear single-step flag */
1220 __regs_RtlRaiseException( rec, context );
1221 NtSetContextThread( GetCurrentThread(), context );
1225 /**********************************************************************
1228 * Generic raise function for exceptions that don't need special treatment.
1230 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1232 __regs_RtlRaiseException( rec, context );
1233 NtSetContextThread( GetCurrentThread(), context );
1238 /**********************************************************************
1239 * raise_vm86_sti_exception
1241 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1243 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1244 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1246 if (ntdll_get_thread_data()->vm86_ptr)
1248 if (((char*)context->Eip >= (char*)vm86_return) &&
1249 ((char*)context->Eip <= (char*)vm86_return_end) &&
1250 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1251 /* exiting from VM86, can't throw */
1254 merge_vm86_pending_flags( rec );
1256 else if (get_vm86_teb_info()->dpmi_vif &&
1257 !wine_ldt_is_system(context->SegCs) &&
1258 !wine_ldt_is_system(context->SegSs))
1260 /* Executing DPMI code and virtual interrupts are enabled. */
1261 get_vm86_teb_info()->vm86_pending = 0;
1262 __regs_RtlRaiseException( rec, context );
1265 NtSetContextThread( GetCurrentThread(), context );
1269 /**********************************************************************
1272 * Handler for SIGUSR2.
1273 * We use it to signal that the running __wine_enter_vm86() should
1274 * immediately set VIP_FLAG, causing pending events to be handled
1275 * as early as possible.
1277 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1279 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1280 rec->ExceptionCode = EXCEPTION_VM86_STI;
1282 #endif /* __HAVE_VM86 */
1285 /**********************************************************************
1288 * Handler for SIGSEGV and related errors.
1290 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1293 EXCEPTION_RECORD *rec;
1294 SIGCONTEXT *context = sigcontext;
1295 void *stack = init_handler( sigcontext, &fs, &gs );
1297 /* check for page fault inside the thread stack */
1298 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1299 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1300 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1301 virtual_handle_stack_fault( siginfo->si_addr ))
1303 /* check if this was the last guard page */
1304 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1306 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1307 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1312 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1313 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1315 switch(get_trap_code(context))
1317 case TRAP_x86_OFLOW: /* Overflow exception */
1318 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1320 case TRAP_x86_BOUND: /* Bound range exception */
1321 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1323 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1324 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1326 case TRAP_x86_STKFLT: /* Stack fault */
1327 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1329 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1330 case TRAP_x86_PROTFLT: /* General protection fault */
1331 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1333 WORD err = get_error_code(context);
1334 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1335 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1336 rec->NumberParameters = 2;
1337 rec->ExceptionInformation[0] = 0;
1338 /* if error contains a LDT selector, use that as fault address */
1339 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1340 rec->ExceptionInformation[1] = err & ~7;
1342 rec->ExceptionInformation[1] = 0xffffffff;
1345 case TRAP_x86_PAGEFLT: /* Page fault */
1346 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1347 rec->NumberParameters = 2;
1348 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1349 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1351 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1352 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1355 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1357 case TRAP_x86_NMI: /* NMI interrupt */
1358 case TRAP_x86_DNA: /* Device not available exception */
1359 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1360 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1361 case TRAP_x86_MCHK: /* Machine check exception */
1362 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1363 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1369 /**********************************************************************
1372 * Handler for SIGTRAP.
1374 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1376 SIGCONTEXT *context = sigcontext;
1377 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1379 switch(get_trap_code(context))
1381 case TRAP_x86_TRCTRAP: /* Single-step exception */
1382 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1384 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1385 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1388 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1394 /**********************************************************************
1397 * Handler for SIGFPE.
1399 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1401 CONTEXT *win_context;
1402 SIGCONTEXT *context = sigcontext;
1403 EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1405 win_context = get_exception_context( rec );
1407 switch(get_trap_code(context))
1409 case TRAP_x86_DIVIDE: /* Division by zero exception */
1410 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1412 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1413 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1415 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1416 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1417 rec->ExceptionCode = get_fpu_code( win_context );
1419 case TRAP_x86_CACHEFLT: /* SIMD exception */
1421 * Behaviour only tested for divide-by-zero exceptions
1422 * Check for other SIMD exceptions as well */
1423 if(siginfo->si_code != FPE_FLTDIV)
1424 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1427 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1428 rec->NumberParameters = 1;
1429 /* no idea what meaning is actually behind this but that's what native does */
1430 rec->ExceptionInformation[0] = 0;
1433 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1434 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1440 /**********************************************************************
1443 * Handler for SIGINT.
1445 * FIXME: should not be calling external functions on the signal stack.
1447 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1450 init_handler( sigcontext, &fs, &gs );
1451 if (!dispatch_signal(SIGINT))
1453 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1454 rec->ExceptionCode = CONTROL_C_EXIT;
1458 /**********************************************************************
1461 * Handler for SIGABRT.
1463 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1465 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1466 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1467 rec->ExceptionFlags = EH_NONCONTINUABLE;
1471 /**********************************************************************
1474 * Handler for SIGQUIT.
1476 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1479 init_handler( sigcontext, &fs, &gs );
1480 server_abort_thread(0);
1484 /**********************************************************************
1487 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1489 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1494 init_handler( sigcontext, &fs, &gs );
1495 save_context( &context, sigcontext, fs, gs );
1496 wait_suspend( &context );
1497 restore_context( &context, sigcontext );
1501 /**********************************************************************
1502 * get_signal_stack_total_size
1504 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1505 * Must be a power of two.
1507 size_t get_signal_stack_total_size(void)
1509 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
1511 if (!signal_stack_size)
1513 size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1514 /* find the first power of two not smaller than min_size */
1515 while (size < min_size) size *= 2;
1516 signal_stack_mask = size - 1;
1517 signal_stack_size = size - teb_size;
1519 return signal_stack_size + teb_size;
1523 /***********************************************************************
1524 * __wine_set_signal_handler (NTDLL.@)
1526 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1528 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1529 if (handlers[sig] != NULL) return -2;
1530 handlers[sig] = wsh;
1535 /**********************************************************************
1536 * signal_init_thread
1538 void signal_init_thread(void)
1540 #ifdef HAVE_SIGALTSTACK
1544 int mib[2], val = 1;
1547 mib[1] = KERN_THALTSTACK;
1548 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1551 ss.ss_sp = get_signal_stack();
1552 ss.ss_size = signal_stack_size;
1554 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1555 #endif /* HAVE_SIGALTSTACK */
1558 /**********************************************************************
1559 * signal_init_process
1561 void signal_init_process(void)
1563 struct sigaction sig_act;
1565 sig_act.sa_mask = server_block_set;
1566 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1568 sig_act.sa_flags |= SA_ONSTACK;
1571 sig_act.sa_sigaction = int_handler;
1572 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1573 sig_act.sa_sigaction = fpe_handler;
1574 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1575 sig_act.sa_sigaction = abrt_handler;
1576 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1577 sig_act.sa_sigaction = quit_handler;
1578 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1579 sig_act.sa_sigaction = usr1_handler;
1580 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1582 sig_act.sa_sigaction = segv_handler;
1583 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1584 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1586 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1590 sig_act.sa_sigaction = trap_handler;
1591 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1595 sig_act.sa_sigaction = usr2_handler;
1596 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1599 signal_init_thread();
1603 perror("sigaction");
1609 /**********************************************************************
1610 * __wine_enter_vm86 (NTDLL.@)
1612 * Enter vm86 mode with the specified register context.
1614 void __wine_enter_vm86( CONTEXT *context )
1616 EXCEPTION_RECORD rec;
1618 struct vm86plus_struct vm86;
1620 memset( &vm86, 0, sizeof(vm86) );
1623 restore_vm86_context( context, &vm86 );
1625 ntdll_get_thread_data()->vm86_ptr = &vm86;
1626 merge_vm86_pending_flags( &rec );
1628 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1635 save_vm86_context( context, &vm86 );
1637 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1638 rec.ExceptionRecord = NULL;
1639 rec.ExceptionAddress = (LPVOID)context->Eip;
1640 rec.NumberParameters = 0;
1642 switch(VM86_TYPE(res))
1644 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1645 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1647 case VM86_TRAP: /* return due to DOS-debugger request */
1648 switch(VM86_ARG(res))
1650 case TRAP_x86_TRCTRAP: /* Single-step exception */
1651 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1653 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1654 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1657 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1661 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1662 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1663 rec.NumberParameters = 1;
1664 rec.ExceptionInformation[0] = VM86_ARG(res);
1666 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1667 context->EFlags |= VIF_FLAG;
1668 context->EFlags &= ~VIP_FLAG;
1669 get_vm86_teb_info()->vm86_pending = 0;
1670 rec.ExceptionCode = EXCEPTION_VM86_STI;
1672 case VM86_PICRETURN: /* return due to pending PIC request */
1673 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1675 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1677 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1680 __regs_RtlRaiseException( &rec, context );
1684 #else /* __HAVE_VM86 */
1685 /**********************************************************************
1686 * __wine_enter_vm86 (NTDLL.@)
1688 void __wine_enter_vm86( CONTEXT *context )
1690 MESSAGE("vm86 mode not supported on this platform\n");
1692 #endif /* __HAVE_VM86 */
1694 /**********************************************************************
1695 * DbgBreakPoint (NTDLL.@)
1697 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1699 /**********************************************************************
1700 * DbgUserBreakPoint (NTDLL.@)
1702 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1705 /**********************************************************************
1706 * EXC_CallHandler (internal)
1708 * Some exception handlers depend on EBP to have a fixed position relative to
1709 * the exception frame.
1710 * Shrinker depends on (*1) doing what it does,
1711 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1712 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1713 * function calling the handler having only 5 parameters (*4).
1715 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1717 " movl %esp, %ebp\n"
1719 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1725 " call " __ASM_NAME("call_exception_handler") "\n"
1730 __ASM_GLOBAL_FUNC(call_exception_handler,
1732 " movl %esp, %ebp\n"
1734 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1735 " pushl %edx\n" /* handler be handled by... */
1737 " pushl (0)\n" /* nested_handler (passed in edx). */
1739 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1744 " movl 24(%ebp), %ecx\n" /* (*1) */
1745 " call *%ecx\n" /* call handler. (*2) */
1747 " movl (0), %esp\n" /* restore previous... (*3) */
1749 " popl (0)\n" /* exception frame. */
1750 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1752 " ret $20\n" /* (*4) */
1754 #endif /* __i386__ */