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>
60 #include "wine/library.h"
61 #include "ntdll_misc.h"
63 #ifdef HAVE_VALGRIND_MEMCHECK_H
64 #include <valgrind/memcheck.h>
67 /***********************************************************************
68 * signal context platform-specific definitions
73 typedef ucontext_t SIGCONTEXT;
75 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
76 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
77 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
78 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
79 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
80 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
81 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
82 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
84 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
85 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
86 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
87 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
88 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
89 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
91 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
92 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
93 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
94 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
96 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
98 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
100 int vm86_enter( void **vm86_ptr );
101 void vm86_return(void);
102 void vm86_return_end(void);
103 __ASM_GLOBAL_FUNC(vm86_enter,
105 "movl %esp, %ebp\n\t"
106 "movl $166,%eax\n\t" /*SYS_vm86*/
107 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
108 "movl (%ecx),%ecx\n\t"
110 "movl $1,%ebx\n\t" /*VM86_ENTER*/
111 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
115 ".globl " __ASM_NAME("vm86_return") "\n\t"
116 __ASM_FUNC("vm86_return") "\n"
117 __ASM_NAME("vm86_return") ":\n\t"
123 "testl %eax,%eax\n\t"
125 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
126 "je " __ASM_NAME("vm86_enter") "\n\t"
128 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
130 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
131 __ASM_FUNC("vm86_return_end") "\n"
132 __ASM_NAME("vm86_return_end") ":\n\t"
135 #ifdef HAVE_SYS_VM86_H
143 #include <machine/frame.h>
144 typedef struct trapframe SIGCONTEXT;
146 #define EAX_sig(context) ((context)->tf_eax)
147 #define EBX_sig(context) ((context)->tf_ebx)
148 #define ECX_sig(context) ((context)->tf_ecx)
149 #define EDX_sig(context) ((context)->tf_edx)
150 #define ESI_sig(context) ((context)->tf_esi)
151 #define EDI_sig(context) ((context)->tf_edi)
152 #define EBP_sig(context) ((context)->tf_ebp)
154 #define CS_sig(context) ((context)->tf_cs)
155 #define DS_sig(context) ((context)->tf_ds)
156 #define ES_sig(context) ((context)->tf_es)
157 #define SS_sig(context) ((context)->tf_ss)
159 #define EFL_sig(context) ((context)->tf_eflags)
161 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
162 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
166 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
168 typedef struct sigcontext SIGCONTEXT;
170 #define EAX_sig(context) ((context)->sc_eax)
171 #define EBX_sig(context) ((context)->sc_ebx)
172 #define ECX_sig(context) ((context)->sc_ecx)
173 #define EDX_sig(context) ((context)->sc_edx)
174 #define ESI_sig(context) ((context)->sc_esi)
175 #define EDI_sig(context) ((context)->sc_edi)
176 #define EBP_sig(context) ((context)->sc_ebp)
178 #define CS_sig(context) ((context)->sc_cs)
179 #define DS_sig(context) ((context)->sc_ds)
180 #define ES_sig(context) ((context)->sc_es)
181 #define FS_sig(context) ((context)->sc_fs)
182 #define GS_sig(context) ((context)->sc_gs)
183 #define SS_sig(context) ((context)->sc_ss)
185 #define TRAP_sig(context) ((context)->sc_trapno)
186 #define ERROR_sig(context) ((context)->sc_err)
187 #define EFL_sig(context) ((context)->sc_eflags)
189 #define EIP_sig(context) ((context)->sc_eip)
190 #define ESP_sig(context) ((context)->sc_esp)
194 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
197 #include <sys/regset.h>
201 #include <sys/ucontext.h>
203 typedef struct ucontext SIGCONTEXT;
209 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
210 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
211 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
212 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
213 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
214 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
215 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
217 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
218 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
219 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
220 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
222 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
223 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
225 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
227 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
229 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
231 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
233 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
236 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
239 #endif /* svr4 || SCO_DS */
242 # include <sys/ucontext.h>
244 typedef ucontext_t SIGCONTEXT;
246 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
247 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
248 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
249 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
250 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
251 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
252 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
254 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
255 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
256 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
257 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
258 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
259 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
261 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
263 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
264 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
266 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
267 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
269 #endif /* __APPLE__ */
271 #include "wine/exception.h"
272 #include "wine/debug.h"
274 WINE_DEFAULT_DEBUG_CHANNEL(seh);
276 typedef int (*wine_signal_handler)(unsigned int sig);
278 static size_t signal_stack_mask;
279 static size_t signal_stack_size;
281 static wine_signal_handler handlers[256];
283 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
287 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
288 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
289 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
290 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
291 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
292 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
293 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
294 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
295 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
296 TRAP_x86_DNA = T_DNA, /* Device not available exception */
297 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
298 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
299 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
300 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
301 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
302 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
303 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
304 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
305 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
306 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
307 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
309 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
310 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
311 TRAP_x86_NMI = 2, /* NMI interrupt */
312 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
313 TRAP_x86_OFLOW = 4, /* Overflow exception */
314 TRAP_x86_BOUND = 5, /* Bound range exception */
315 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
316 TRAP_x86_DNA = 7, /* Device not available exception */
317 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
318 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
319 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
320 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
321 TRAP_x86_STKFLT = 12, /* Stack fault */
322 TRAP_x86_PROTFLT = 13, /* General protection fault */
323 TRAP_x86_PAGEFLT = 14, /* Page fault */
324 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
325 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
326 TRAP_x86_MCHK = 18, /* Machine check exception */
327 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
328 otherwise Cache flush exception (via SIGSEV) */
333 /***********************************************************************
336 inline static int dispatch_signal(unsigned int sig)
338 if (handlers[sig] == NULL) return 0;
339 return handlers[sig](sig);
343 /***********************************************************************
346 * Get the trap code for a signal.
348 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
351 return TRAP_sig(sigcontext);
353 return TRAP_x86_UNKNOWN; /* unknown trap code */
357 /***********************************************************************
360 * Get the error code for a signal.
362 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
365 return ERROR_sig(sigcontext);
371 /***********************************************************************
374 * Get the base of the signal stack for the current thread.
376 static inline void *get_signal_stack(void)
378 return (char *)NtCurrentTeb() + 4096;
382 /***********************************************************************
385 * Get the current teb based on the stack pointer.
387 static inline TEB *get_current_teb(void)
390 __asm__("movl %%esp,%0" : "=g" (esp) );
391 return (TEB *)(esp & ~signal_stack_mask);
396 /***********************************************************************
399 * Set the register values from a vm86 structure.
401 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
403 context->ContextFlags = CONTEXT_FULL;
404 context->Eax = vm86->regs.eax;
405 context->Ebx = vm86->regs.ebx;
406 context->Ecx = vm86->regs.ecx;
407 context->Edx = vm86->regs.edx;
408 context->Esi = vm86->regs.esi;
409 context->Edi = vm86->regs.edi;
410 context->Esp = vm86->regs.esp;
411 context->Ebp = vm86->regs.ebp;
412 context->Eip = vm86->regs.eip;
413 context->SegCs = vm86->regs.cs;
414 context->SegDs = vm86->regs.ds;
415 context->SegEs = vm86->regs.es;
416 context->SegFs = vm86->regs.fs;
417 context->SegGs = vm86->regs.gs;
418 context->SegSs = vm86->regs.ss;
419 context->EFlags = vm86->regs.eflags;
423 /***********************************************************************
424 * restore_vm86_context
426 * Build a vm86 structure from the register values.
428 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
430 vm86->regs.eax = context->Eax;
431 vm86->regs.ebx = context->Ebx;
432 vm86->regs.ecx = context->Ecx;
433 vm86->regs.edx = context->Edx;
434 vm86->regs.esi = context->Esi;
435 vm86->regs.edi = context->Edi;
436 vm86->regs.esp = context->Esp;
437 vm86->regs.ebp = context->Ebp;
438 vm86->regs.eip = context->Eip;
439 vm86->regs.cs = context->SegCs;
440 vm86->regs.ds = context->SegDs;
441 vm86->regs.es = context->SegEs;
442 vm86->regs.fs = context->SegFs;
443 vm86->regs.gs = context->SegGs;
444 vm86->regs.ss = context->SegSs;
445 vm86->regs.eflags = context->EFlags;
449 /**********************************************************************
450 * merge_vm86_pending_flags
452 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
453 * raises exception if there are pending events and VIF flag
454 * has been turned on.
456 * Called from __wine_enter_vm86 because vm86_enter
457 * doesn't check for pending events.
459 * Called from raise_vm86_sti_exception to check for
460 * pending events in a signal safe way.
462 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
464 BOOL check_pending = TRUE;
465 struct vm86plus_struct *vm86 =
466 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
469 * In order to prevent a race when SIGUSR2 occurs while
470 * we are returning from exception handler, pending events
471 * will be rechecked after each raised exception.
473 while (check_pending && NtCurrentTeb()->vm86_pending)
475 check_pending = FALSE;
476 ntdll_get_thread_data()->vm86_ptr = NULL;
479 * If VIF is set, throw exception.
480 * Note that SIGUSR2 may turn VIF flag off so
481 * VIF check must occur only when TEB.vm86_ptr is NULL.
483 if (vm86->regs.eflags & VIF_MASK)
486 save_vm86_context( &vcontext, vm86 );
488 rec->ExceptionCode = EXCEPTION_VM86_STI;
489 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
490 rec->ExceptionRecord = NULL;
491 rec->NumberParameters = 0;
492 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
494 vcontext.EFlags &= ~VIP_MASK;
495 NtCurrentTeb()->vm86_pending = 0;
496 __regs_RtlRaiseException( rec, &vcontext );
498 restore_vm86_context( &vcontext, vm86 );
499 check_pending = TRUE;
502 ntdll_get_thread_data()->vm86_ptr = vm86;
506 * Merge VIP flags in a signal safe way. This requires
507 * that the following operation compiles into atomic
510 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
512 #endif /* __HAVE_VM86 */
515 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
518 /***********************************************************************
521 * Handler initialization when the full context is not needed.
523 inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
525 void *stack = (void *)(ESP_sig(sigcontext) & ~3);
526 TEB *teb = get_current_teb();
527 struct ntdll_thread_regs *thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1;
529 /* get %fs and %gs at time of the fault */
531 *fs = LOWORD(FS_sig(sigcontext));
536 *gs = LOWORD(GS_sig(sigcontext));
541 wine_set_fs( thread_regs->fs );
543 /* now restore a proper %gs for the fault handler */
544 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
545 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
548 * Win16 or DOS protected mode. Note that during switch
549 * from 16-bit mode to linear mode, CS may be set to system
550 * segment before FS is restored. Fortunately, in this case
551 * SS is still non-system segment. This is why both CS and SS
554 wine_set_gs( thread_regs->gs );
555 stack = teb->WOW32Reserved;
558 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
560 unsigned int *int_stack = stack;
561 /* fetch the saved %gs from the stack */
562 wine_set_gs( int_stack[0] );
565 else /* 32-bit mode */
568 wine_set_gs( GS_sig(sigcontext) );
575 /***********************************************************************
578 * Save the thread FPU context.
580 inline static void save_fpu( CONTEXT *context )
583 context->ContextFlags |= CONTEXT_FLOATING_POINT;
584 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
589 /***********************************************************************
592 * Restore the FPU context to a sigcontext.
594 inline static void restore_fpu( const CONTEXT *context )
596 FLOATING_SAVE_AREA float_status = context->FloatSave;
597 /* reset the current interrupt status */
598 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
600 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
601 #endif /* __GNUC__ */
605 /***********************************************************************
608 * Build a context structure from the signal info.
610 inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
612 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
614 memset(context, 0, sizeof(*context));
615 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
616 context->Eax = EAX_sig(sigcontext);
617 context->Ebx = EBX_sig(sigcontext);
618 context->Ecx = ECX_sig(sigcontext);
619 context->Edx = EDX_sig(sigcontext);
620 context->Esi = ESI_sig(sigcontext);
621 context->Edi = EDI_sig(sigcontext);
622 context->Ebp = EBP_sig(sigcontext);
623 context->EFlags = EFL_sig(sigcontext);
624 context->Eip = EIP_sig(sigcontext);
625 context->Esp = ESP_sig(sigcontext);
626 context->SegCs = LOWORD(CS_sig(sigcontext));
627 context->SegDs = LOWORD(DS_sig(sigcontext));
628 context->SegEs = LOWORD(ES_sig(sigcontext));
631 context->SegSs = LOWORD(SS_sig(sigcontext));
632 context->Dr0 = regs->dr0;
633 context->Dr1 = regs->dr1;
634 context->Dr2 = regs->dr2;
635 context->Dr3 = regs->dr3;
636 context->Dr6 = regs->dr6;
637 context->Dr7 = regs->dr7;
640 if (FPU_sig(sigcontext))
642 context->ContextFlags |= CONTEXT_FLOATING_POINT;
643 context->FloatSave = *FPU_sig(sigcontext);
653 /***********************************************************************
656 * Restore the signal info from the context.
658 inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
660 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
662 regs->dr0 = context->Dr0;
663 regs->dr1 = context->Dr1;
664 regs->dr2 = context->Dr2;
665 regs->dr3 = context->Dr3;
666 regs->dr6 = context->Dr6;
667 regs->dr7 = context->Dr7;
668 EAX_sig(sigcontext) = context->Eax;
669 EBX_sig(sigcontext) = context->Ebx;
670 ECX_sig(sigcontext) = context->Ecx;
671 EDX_sig(sigcontext) = context->Edx;
672 ESI_sig(sigcontext) = context->Esi;
673 EDI_sig(sigcontext) = context->Edi;
674 EBP_sig(sigcontext) = context->Ebp;
675 EFL_sig(sigcontext) = context->EFlags;
676 EIP_sig(sigcontext) = context->Eip;
677 ESP_sig(sigcontext) = context->Esp;
678 CS_sig(sigcontext) = context->SegCs;
679 DS_sig(sigcontext) = context->SegDs;
680 ES_sig(sigcontext) = context->SegEs;
681 SS_sig(sigcontext) = context->SegSs;
683 GS_sig(sigcontext) = context->SegGs;
685 wine_set_gs( context->SegGs );
688 FS_sig(sigcontext) = context->SegFs;
690 wine_set_fs( context->SegFs );
694 if (FPU_sig(sigcontext))
696 *FPU_sig(sigcontext) = context->FloatSave;
701 restore_fpu( context );
706 /***********************************************************************
709 * Register function to get the context of the current thread.
711 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
716 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 );
719 /***********************************************************************
722 * Set the new CPU context. Used by NtSetContextThread.
724 void set_cpu_context( const CONTEXT *context )
726 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
728 if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
730 if (flags & CONTEXT_DEBUG_REGISTERS)
732 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
733 regs->dr0 = context->Dr0;
734 regs->dr1 = context->Dr1;
735 regs->dr2 = context->Dr2;
736 regs->dr3 = context->Dr3;
737 regs->dr6 = context->Dr6;
738 regs->dr7 = context->Dr7;
740 if (flags & CONTEXT_FULL)
742 if ((flags & CONTEXT_FULL) != (CONTEXT_FULL & ~CONTEXT_i386))
743 FIXME( "setting partial context (%x) not supported\n", flags );
745 __wine_call_from_32_restore_regs( context );
750 /***********************************************************************
751 * is_privileged_instr
753 * Check if the fault location is a privileged instruction.
754 * Based on the instruction emulation code in dlls/kernel/instr.c.
756 static inline int is_privileged_instr( CONTEXT86 *context )
759 unsigned int prefix_count = 0;
761 if (!wine_ldt_is_system( context->SegCs )) return 0;
762 instr = (BYTE *)context->Eip;
764 for (;;) switch(*instr)
766 /* instruction prefixes */
767 case 0x2e: /* %cs: */
768 case 0x36: /* %ss: */
769 case 0x3e: /* %ds: */
770 case 0x26: /* %es: */
771 case 0x64: /* %fs: */
772 case 0x65: /* %gs: */
773 case 0x66: /* opcode size */
774 case 0x67: /* addr size */
775 case 0xf0: /* lock */
776 case 0xf2: /* repne */
777 case 0xf3: /* repe */
778 if (++prefix_count >= 15) return 0;
782 case 0x0f: /* extended instruction */
785 case 0x20: /* mov crX, reg */
786 case 0x21: /* mov drX, reg */
787 case 0x22: /* mov reg, crX */
788 case 0x23: /* mov reg drX */
792 case 0x6c: /* insb (%dx) */
793 case 0x6d: /* insl (%dx) */
794 case 0x6e: /* outsb (%dx) */
795 case 0x6f: /* outsl (%dx) */
796 case 0xcd: /* int $xx */
797 case 0xe4: /* inb al,XX */
798 case 0xe5: /* in (e)ax,XX */
799 case 0xe6: /* outb XX,al */
800 case 0xe7: /* out XX,(e)ax */
801 case 0xec: /* inb (%dx),%al */
802 case 0xed: /* inl (%dx),%eax */
803 case 0xee: /* outb %al,(%dx) */
804 case 0xef: /* outl %eax,(%dx) */
815 #include "pshpack1.h"
818 DWORD movl; /* movl this,4(%esp) */
820 BYTE jmp; /* jmp func */
825 /**********************************************************************
828 * Check if code destination is an ATL thunk, and emulate it if so.
830 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
832 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
837 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
839 *((DWORD *)context->Esp + 1) = thunk->this;
840 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
841 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
842 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
855 /***********************************************************************
858 * Setup a proper stack frame for the raise function, and modify the
859 * sigcontext so that the return from the signal handler will call
860 * the raise function.
862 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
866 void *ret_addr; /* return address from raise_func */
867 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
868 CONTEXT *context_ptr; /* second arg for raise_func */
870 EXCEPTION_RECORD rec;
877 stack = init_handler( sigcontext, &fs, &gs );
879 /* stack sanity checks */
881 if ((char *)stack >= (char *)get_signal_stack() &&
882 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
884 ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
885 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
886 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
887 NtCurrentTeb()->Tib.StackBase );
888 server_abort_thread(1);
891 if (stack - 1 > stack || /* check for overflow in subtraction */
892 (char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit ||
893 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
895 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)stack;
898 ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p\n",
899 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
900 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
901 NtCurrentTeb()->Tib.StackBase );
902 server_abort_thread(1);
904 else WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
905 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
906 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
907 NtCurrentTeb()->Tib.StackBase );
910 stack--; /* push the stack_layout structure */
911 #ifdef HAVE_VALGRIND_MEMCHECK_H
912 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
914 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
915 stack->rec_ptr = &stack->rec;
916 stack->context_ptr = &stack->context;
918 stack->rec.ExceptionRecord = NULL;
919 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
920 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
921 stack->rec.NumberParameters = 0;
923 save_context( &stack->context, sigcontext, fs, gs );
925 /* now modify the sigcontext to return to the raise function */
926 ESP_sig(sigcontext) = (DWORD)stack;
927 EIP_sig(sigcontext) = (DWORD)func;
928 /* clear single-step and align check flag */
929 EFL_sig(sigcontext) &= ~(0x100|0x40000);
930 CS_sig(sigcontext) = wine_get_cs();
931 DS_sig(sigcontext) = wine_get_ds();
932 ES_sig(sigcontext) = wine_get_es();
933 FS_sig(sigcontext) = wine_get_fs();
934 GS_sig(sigcontext) = wine_get_gs();
935 SS_sig(sigcontext) = wine_get_ss();
937 return stack->rec_ptr;
941 /***********************************************************************
942 * get_exception_context
944 * Get a pointer to the context built by setup_exception.
946 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
948 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
952 /**********************************************************************
955 * Get the FPU exception code from the FPU status.
957 static inline DWORD get_fpu_code( const CONTEXT *context )
959 DWORD status = context->FloatSave.StatusWord;
961 if (status & 0x01) /* IE */
963 if (status & 0x40) /* SF */
964 return EXCEPTION_FLT_STACK_CHECK;
966 return EXCEPTION_FLT_INVALID_OPERATION;
968 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
969 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
970 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
971 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
972 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
973 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
977 /**********************************************************************
978 * raise_segv_exception
980 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
982 switch(rec->ExceptionCode)
984 case EXCEPTION_ACCESS_VIOLATION:
985 if (rec->NumberParameters == 2)
987 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
989 rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
992 case EXCEPTION_DATATYPE_MISALIGNMENT:
993 /* FIXME: pass through exception handler first? */
994 if (context->EFlags & 0x00040000)
996 /* Disable AC flag, return */
997 context->EFlags &= ~0x00040000;
1002 __regs_RtlRaiseException( rec, context );
1004 NtSetContextThread( GetCurrentThread(), context );
1008 /**********************************************************************
1009 * raise_trap_exception
1011 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1013 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1015 if (context->EFlags & 0x100)
1017 context->EFlags &= ~0x100; /* clear single-step flag */
1019 else /* hardware breakpoint, fetch the debug registers */
1021 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1022 NtGetContextThread(GetCurrentThread(), context);
1024 * - a bp from a debug register
1025 * - a single step interrupt at popf instruction, which just has
1027 * - someone did a kill(SIGTRAP) on us, and we shall return
1028 * a breakpoint, not a single step exception
1030 if ( !(context->Dr6 & 0xf) && !(context->Dr6 & 0x4000) )
1031 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1032 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1036 __regs_RtlRaiseException( rec, context );
1037 NtSetContextThread( GetCurrentThread(), context );
1041 /**********************************************************************
1044 * Generic raise function for exceptions that don't need special treatment.
1046 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1048 __regs_RtlRaiseException( rec, context );
1049 NtSetContextThread( GetCurrentThread(), context );
1054 /**********************************************************************
1055 * raise_vm86_sti_exception
1057 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1059 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1060 NtCurrentTeb()->vm86_pending |= VIP_MASK;
1062 if (ntdll_get_thread_data()->vm86_ptr)
1064 if (((char*)context->Eip >= (char*)vm86_return) &&
1065 ((char*)context->Eip <= (char*)vm86_return_end) &&
1066 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1067 /* exiting from VM86, can't throw */
1070 merge_vm86_pending_flags( rec );
1072 else if (NtCurrentTeb()->dpmi_vif &&
1073 !wine_ldt_is_system(context->SegCs) &&
1074 !wine_ldt_is_system(context->SegSs))
1076 /* Executing DPMI code and virtual interrupts are enabled. */
1077 NtCurrentTeb()->vm86_pending = 0;
1078 __regs_RtlRaiseException( rec, context );
1081 NtSetContextThread( GetCurrentThread(), context );
1085 /**********************************************************************
1088 * Handler for SIGUSR2.
1089 * We use it to signal that the running __wine_enter_vm86() should
1090 * immediately set VIP_MASK, causing pending events to be handled
1091 * as early as possible.
1093 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1095 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1096 rec->ExceptionCode = EXCEPTION_VM86_STI;
1098 #endif /* __HAVE_VM86 */
1101 /**********************************************************************
1104 * Handler for SIGSEGV and related errors.
1106 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1108 SIGCONTEXT *context = sigcontext;
1109 EXCEPTION_RECORD *rec = setup_exception( context, raise_segv_exception );
1111 switch(get_trap_code(context))
1113 case TRAP_x86_OFLOW: /* Overflow exception */
1114 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1116 case TRAP_x86_BOUND: /* Bound range exception */
1117 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1119 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1120 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1122 case TRAP_x86_STKFLT: /* Stack fault */
1123 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1125 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1126 case TRAP_x86_PROTFLT: /* General protection fault */
1127 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1128 if (!get_error_code(context) && is_privileged_instr( get_exception_context(rec) ))
1129 rec->ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1132 WORD err = get_error_code(context);
1133 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1134 rec->NumberParameters = 2;
1135 rec->ExceptionInformation[0] = 0;
1136 /* if error contains a LDT selector, use that as fault address */
1137 rec->ExceptionInformation[1] = (err & 7) == 4 ? (err & ~7) : 0xffffffff;
1140 case TRAP_x86_PAGEFLT: /* Page fault */
1141 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1142 rec->NumberParameters = 2;
1143 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1144 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1146 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1147 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1150 ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1152 case TRAP_x86_NMI: /* NMI interrupt */
1153 case TRAP_x86_DNA: /* Device not available exception */
1154 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1155 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1156 case TRAP_x86_MCHK: /* Machine check exception */
1157 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1158 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1164 /**********************************************************************
1167 * Handler for SIGTRAP.
1169 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1171 SIGCONTEXT *context = sigcontext;
1172 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1174 switch(get_trap_code(context))
1176 case TRAP_x86_TRCTRAP: /* Single-step exception */
1177 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1179 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1180 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1183 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1189 /**********************************************************************
1192 * Handler for SIGFPE.
1194 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1196 CONTEXT *win_context;
1197 SIGCONTEXT *context = sigcontext;
1198 EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1200 win_context = get_exception_context( rec );
1202 switch(get_trap_code(context))
1204 case TRAP_x86_DIVIDE: /* Division by zero exception */
1205 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1207 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1208 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1210 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1211 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1212 rec->ExceptionCode = get_fpu_code( win_context );
1214 case TRAP_x86_CACHEFLT: /* SIMD exception */
1216 * Behaviour only tested for divide-by-zero exceptions
1217 * Check for other SIMD exceptions as well */
1218 if(siginfo->si_code != FPE_FLTDIV)
1219 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1222 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1223 rec->NumberParameters = 1;
1224 /* no idea what meaning is actually behind this but thats what native does */
1225 rec->ExceptionInformation[0] = 0;
1228 ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1229 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1235 /**********************************************************************
1238 * Handler for SIGINT.
1240 * FIXME: should not be calling external functions on the signal stack.
1242 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1245 init_handler( sigcontext, &fs, &gs );
1246 if (!dispatch_signal(SIGINT))
1248 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1249 rec->ExceptionCode = CONTROL_C_EXIT;
1253 /**********************************************************************
1256 * Handler for SIGABRT.
1258 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1260 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1261 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1262 rec->ExceptionFlags = EH_NONCONTINUABLE;
1266 /**********************************************************************
1269 * Handler for SIGTERM.
1271 static void term_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1274 init_handler( sigcontext, &fs, &gs );
1275 server_abort_thread(0);
1279 /**********************************************************************
1282 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1284 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1289 init_handler( sigcontext, &fs, &gs );
1290 save_context( &context, sigcontext, fs, gs );
1291 wait_suspend( &context );
1292 restore_context( &context, sigcontext );
1296 /**********************************************************************
1297 * get_signal_stack_total_size
1299 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1300 * Must be a power of two.
1302 size_t get_signal_stack_total_size(void)
1304 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
1306 if (!signal_stack_size)
1308 size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 );
1309 /* find the first power of two not smaller than min_size */
1310 while (size < min_size) size *= 2;
1311 signal_stack_mask = size - 1;
1312 signal_stack_size = size - teb_size;
1314 return signal_stack_size + teb_size;
1318 /***********************************************************************
1319 * __wine_set_signal_handler (NTDLL.@)
1321 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1323 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1324 if (handlers[sig] != NULL) return -2;
1325 handlers[sig] = wsh;
1330 /**********************************************************************
1333 BOOL SIGNAL_Init(void)
1335 struct sigaction sig_act;
1337 #ifdef HAVE_SIGALTSTACK
1338 struct sigaltstack ss;
1341 int mib[2], val = 1;
1344 mib[1] = KERN_THALTSTACK;
1345 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1348 ss.ss_sp = get_signal_stack();
1349 ss.ss_size = signal_stack_size;
1351 if (sigaltstack(&ss, NULL) == -1)
1353 perror( "sigaltstack" );
1356 #endif /* HAVE_SIGALTSTACK */
1358 sig_act.sa_mask = server_block_set;
1359 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1361 sig_act.sa_flags |= SA_ONSTACK;
1364 sig_act.sa_sigaction = int_handler;
1365 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1366 sig_act.sa_sigaction = fpe_handler;
1367 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1368 sig_act.sa_sigaction = abrt_handler;
1369 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1370 sig_act.sa_sigaction = term_handler;
1371 if (sigaction( SIGTERM, &sig_act, NULL ) == -1) goto error;
1372 sig_act.sa_sigaction = usr1_handler;
1373 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1375 sig_act.sa_sigaction = segv_handler;
1376 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1377 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1379 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1383 sig_act.sa_sigaction = trap_handler;
1384 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1388 sig_act.sa_sigaction = usr2_handler;
1389 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1395 perror("sigaction");
1401 /**********************************************************************
1402 * __wine_enter_vm86 (NTDLL.@)
1404 * Enter vm86 mode with the specified register context.
1406 void __wine_enter_vm86( CONTEXT *context )
1408 EXCEPTION_RECORD rec;
1410 struct vm86plus_struct vm86;
1412 memset( &vm86, 0, sizeof(vm86) );
1415 restore_vm86_context( context, &vm86 );
1417 ntdll_get_thread_data()->vm86_ptr = &vm86;
1418 merge_vm86_pending_flags( &rec );
1420 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1427 save_vm86_context( context, &vm86 );
1429 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1430 rec.ExceptionRecord = NULL;
1431 rec.ExceptionAddress = (LPVOID)context->Eip;
1432 rec.NumberParameters = 0;
1434 switch(VM86_TYPE(res))
1436 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1437 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1438 raise_segv_exception( &rec, context );
1440 case VM86_TRAP: /* return due to DOS-debugger request */
1441 switch(VM86_ARG(res))
1443 case TRAP_x86_TRCTRAP: /* Single-step exception */
1444 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1446 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1447 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1450 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1454 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1455 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1456 rec.NumberParameters = 1;
1457 rec.ExceptionInformation[0] = VM86_ARG(res);
1459 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1460 context->EFlags |= VIF_MASK;
1461 context->EFlags &= ~VIP_MASK;
1462 NtCurrentTeb()->vm86_pending = 0;
1463 rec.ExceptionCode = EXCEPTION_VM86_STI;
1465 case VM86_PICRETURN: /* return due to pending PIC request */
1466 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1468 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1470 ERR( "unhandled result from vm86 mode %x\n", res );
1473 __regs_RtlRaiseException( &rec, context );
1477 #else /* __HAVE_VM86 */
1478 /**********************************************************************
1479 * __wine_enter_vm86 (NTDLL.@)
1481 void __wine_enter_vm86( CONTEXT *context )
1483 MESSAGE("vm86 mode not supported on this platform\n");
1485 #endif /* __HAVE_VM86 */
1487 /**********************************************************************
1488 * DbgBreakPoint (NTDLL.@)
1490 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1492 /**********************************************************************
1493 * DbgUserBreakPoint (NTDLL.@)
1495 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1498 /**********************************************************************
1499 * EXC_CallHandler (internal)
1501 * Some exception handlers depend on EBP to have a fixed position relative to
1502 * the exception frame.
1503 * Shrinker depends on (*1) doing what it does,
1504 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1505 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1506 * function calling the handler having only 5 parameters (*4).
1508 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1510 " movl %esp, %ebp\n"
1512 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1518 " call " __ASM_NAME("call_exception_handler") "\n"
1523 __ASM_GLOBAL_FUNC(call_exception_handler,
1525 " movl %esp, %ebp\n"
1527 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1528 " pushl %edx\n" /* handler be handled by... */
1530 " pushl (0)\n" /* nested_handler (passed in edx). */
1532 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1537 " movl 24(%ebp), %ecx\n" /* (*1) */
1538 " call *%ecx\n" /* call handler. (*2) */
1540 " movl (0), %esp\n" /* restore previous... (*3) */
1542 " popl (0)\n" /* exception frame. */
1543 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1545 " ret $20\n" /* (*4) */
1547 #endif /* __i386__ */