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(__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 #if defined(__NetBSD__)
336 # include <sys/ucontext.h>
337 # include <sys/types.h>
340 typedef ucontext_t SIGCONTEXT;
342 #define EAX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EAX])
343 #define EBX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBX])
344 #define ECX_sig(context) ((context)->uc_mcontext.__gregs[_REG_ECX])
345 #define EDX_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDX])
346 #define ESI_sig(context) ((context)->uc_mcontext.__gregs[_REG_ESI])
347 #define EDI_sig(context) ((context)->uc_mcontext.__gregs[_REG_EDI])
348 #define EBP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EBP])
349 #define ESP_sig(context) _UC_MACHINE_SP(context)
351 #define CS_sig(context) ((context)->uc_mcontext.__gregs[_REG_CS])
352 #define DS_sig(context) ((context)->uc_mcontext.__gregs[_REG_DS])
353 #define ES_sig(context) ((context)->uc_mcontext.__gregs[_REG_ES])
354 #define SS_sig(context) ((context)->uc_mcontext.__gregs[_REG_SS])
355 #define FS_sig(context) ((context)->uc_mcontext.__gregs[_REG_FS])
356 #define GS_sig(context) ((context)->uc_mcontext.__gregs[_REG_GS])
358 #define EFL_sig(context) ((context)->uc_mcontext.__gregs[_REG_EFL])
359 #define EIP_sig(context) _UC_MACHINE_PC(context)
360 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
361 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
363 #define FPU_sig(context) NULL
364 #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))
367 #define T_XMMFLT T_XMM
369 #endif /* __NetBSD__ */
371 WINE_DEFAULT_DEBUG_CHANNEL(seh);
373 typedef int (*wine_signal_handler)(unsigned int sig);
375 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
376 static size_t signal_stack_mask;
377 static size_t signal_stack_size;
379 static wine_signal_handler handlers[256];
381 static int fpux_support; /* whether the CPU support extended fpu context */
383 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
387 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
388 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
389 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
390 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
391 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
392 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
393 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
394 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
395 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
396 TRAP_x86_DNA = T_DNA, /* Device not available exception */
397 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
398 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
399 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
400 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
401 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
402 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
403 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
404 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
405 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
406 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
407 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
409 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
410 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
411 TRAP_x86_NMI = 2, /* NMI interrupt */
412 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
413 TRAP_x86_OFLOW = 4, /* Overflow exception */
414 TRAP_x86_BOUND = 5, /* Bound range exception */
415 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
416 TRAP_x86_DNA = 7, /* Device not available exception */
417 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
418 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
419 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
420 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
421 TRAP_x86_STKFLT = 12, /* Stack fault */
422 TRAP_x86_PROTFLT = 13, /* General protection fault */
423 TRAP_x86_PAGEFLT = 14, /* Page fault */
424 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
425 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
426 TRAP_x86_MCHK = 18, /* Machine check exception */
427 TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable
428 otherwise Cache flush exception (via SIGSEV) */
433 /***********************************************************************
436 static inline int dispatch_signal(unsigned int sig)
438 if (handlers[sig] == NULL) return 0;
439 return handlers[sig](sig);
443 /***********************************************************************
446 * Get the trap code for a signal.
448 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
451 return TRAP_sig(sigcontext);
453 return TRAP_x86_UNKNOWN; /* unknown trap code */
457 /***********************************************************************
460 * Get the error code for a signal.
462 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
465 return ERROR_sig(sigcontext);
471 /***********************************************************************
474 * Get the base of the signal stack for the current thread.
476 static inline void *get_signal_stack(void)
478 return (char *)NtCurrentTeb() + 4096;
482 /***********************************************************************
485 * Get the current teb based on the stack pointer.
487 static inline TEB *get_current_teb(void)
490 __asm__("movl %%esp,%0" : "=g" (esp) );
491 return (TEB *)(esp & ~signal_stack_mask);
496 /***********************************************************************
499 * Set the register values from a vm86 structure.
501 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
503 context->ContextFlags = CONTEXT_FULL;
504 context->Eax = vm86->regs.eax;
505 context->Ebx = vm86->regs.ebx;
506 context->Ecx = vm86->regs.ecx;
507 context->Edx = vm86->regs.edx;
508 context->Esi = vm86->regs.esi;
509 context->Edi = vm86->regs.edi;
510 context->Esp = vm86->regs.esp;
511 context->Ebp = vm86->regs.ebp;
512 context->Eip = vm86->regs.eip;
513 context->SegCs = vm86->regs.cs;
514 context->SegDs = vm86->regs.ds;
515 context->SegEs = vm86->regs.es;
516 context->SegFs = vm86->regs.fs;
517 context->SegGs = vm86->regs.gs;
518 context->SegSs = vm86->regs.ss;
519 context->EFlags = vm86->regs.eflags;
523 /***********************************************************************
524 * restore_vm86_context
526 * Build a vm86 structure from the register values.
528 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
530 vm86->regs.eax = context->Eax;
531 vm86->regs.ebx = context->Ebx;
532 vm86->regs.ecx = context->Ecx;
533 vm86->regs.edx = context->Edx;
534 vm86->regs.esi = context->Esi;
535 vm86->regs.edi = context->Edi;
536 vm86->regs.esp = context->Esp;
537 vm86->regs.ebp = context->Ebp;
538 vm86->regs.eip = context->Eip;
539 vm86->regs.cs = context->SegCs;
540 vm86->regs.ds = context->SegDs;
541 vm86->regs.es = context->SegEs;
542 vm86->regs.fs = context->SegFs;
543 vm86->regs.gs = context->SegGs;
544 vm86->regs.ss = context->SegSs;
545 vm86->regs.eflags = context->EFlags;
549 /**********************************************************************
550 * merge_vm86_pending_flags
552 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
553 * raises exception if there are pending events and VIF flag
554 * has been turned on.
556 * Called from __wine_enter_vm86 because vm86_enter
557 * doesn't check for pending events.
559 * Called from raise_vm86_sti_exception to check for
560 * pending events in a signal safe way.
562 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
564 BOOL check_pending = TRUE;
565 struct vm86plus_struct *vm86 =
566 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
569 * In order to prevent a race when SIGUSR2 occurs while
570 * we are returning from exception handler, pending events
571 * will be rechecked after each raised exception.
573 while (check_pending && get_vm86_teb_info()->vm86_pending)
575 check_pending = FALSE;
576 ntdll_get_thread_data()->vm86_ptr = NULL;
579 * If VIF is set, throw exception.
580 * Note that SIGUSR2 may turn VIF flag off so
581 * VIF check must occur only when TEB.vm86_ptr is NULL.
583 if (vm86->regs.eflags & VIF_FLAG)
586 save_vm86_context( &vcontext, vm86 );
588 rec->ExceptionCode = EXCEPTION_VM86_STI;
589 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
590 rec->ExceptionRecord = NULL;
591 rec->NumberParameters = 0;
592 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
594 vcontext.EFlags &= ~VIP_FLAG;
595 get_vm86_teb_info()->vm86_pending = 0;
596 __regs_RtlRaiseException( rec, &vcontext );
598 restore_vm86_context( &vcontext, vm86 );
599 check_pending = TRUE;
602 ntdll_get_thread_data()->vm86_ptr = vm86;
606 * Merge VIP flags in a signal safe way. This requires
607 * that the following operation compiles into atomic
610 vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
612 #endif /* __HAVE_VM86 */
617 /* We have to workaround two Solaris breakages:
618 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
620 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
621 * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
624 extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
625 __ASM_GLOBAL_FUNC( sigaction_syscall,
626 "movl $0x62,%eax\n\t"
630 /* assume the same libc handler is used for all signals */
631 static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );
633 static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
635 struct ntdll_thread_data *thread_data;
637 __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");
639 thread_data = get_current_teb()->SystemReserved2;
640 wine_set_fs( thread_data->fs );
641 wine_set_gs( thread_data->gs );
643 libc_sigacthandler( signal, siginfo, sigcontext );
646 static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
648 struct sigaction real_act;
650 if (sigaction( sig, new, old ) == -1) return -1;
652 /* retrieve the real handler and flags with a direct syscall */
653 sigaction_syscall( sig, NULL, &real_act );
654 libc_sigacthandler = real_act.sa_sigaction;
655 real_act.sa_sigaction = wine_sigacthandler;
656 sigaction_syscall( sig, &real_act, NULL );
659 #define sigaction(sig,new,old) solaris_sigaction(sig,new,old)
663 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
666 /***********************************************************************
669 * Handler initialization when the full context is not needed.
670 * Return the stack pointer to use for pushing the exception data.
672 static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
674 TEB *teb = get_current_teb();
675 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
677 /* get %fs and %gs at time of the fault */
679 *fs = LOWORD(FS_sig(sigcontext));
684 *gs = LOWORD(GS_sig(sigcontext));
689 #ifndef __sun /* see above for Solaris handling */
690 wine_set_fs( thread_data->fs );
691 wine_set_gs( thread_data->gs );
694 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
695 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
698 * Win16 or DOS protected mode. Note that during switch
699 * from 16-bit mode to linear mode, CS may be set to system
700 * segment before FS is restored. Fortunately, in this case
701 * SS is still non-system segment. This is why both CS and SS
704 return teb->WOW32Reserved;
706 return (void *)(ESP_sig(sigcontext) & ~3);
710 /***********************************************************************
713 * Save the thread FPU context.
715 static inline void save_fpu( CONTEXT *context )
718 context->ContextFlags |= CONTEXT_FLOATING_POINT;
719 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
724 /***********************************************************************
727 * Save the thread FPU extended context.
729 static inline void save_fpux( CONTEXT *context )
732 /* we have to enforce alignment by hand */
733 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
734 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
736 __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
737 context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
738 memcpy( context->ExtendedRegisters, state, sizeof(*state) );
743 /***********************************************************************
746 * Restore the FPU context to a sigcontext.
748 static inline void restore_fpu( const CONTEXT *context )
750 FLOATING_SAVE_AREA float_status = context->FloatSave;
751 /* reset the current interrupt status */
752 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
754 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
755 #endif /* __GNUC__ */
759 /***********************************************************************
762 * Restore the FPU extended context to a sigcontext.
764 static inline void restore_fpux( const CONTEXT *context )
767 /* we have to enforce alignment by hand */
768 char buffer[sizeof(XMM_SAVE_AREA32) + 16];
769 XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
771 memcpy( state, context->ExtendedRegisters, sizeof(*state) );
772 /* reset the current interrupt status */
773 state->StatusWord &= state->ControlWord | 0xff80;
774 __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
779 /***********************************************************************
782 * Build a standard FPU context from an extended one.
784 static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
786 unsigned int i, tag, stack_top;
788 fpu->ControlWord = fpux->ControlWord | 0xffff0000;
789 fpu->StatusWord = fpux->StatusWord | 0xffff0000;
790 fpu->ErrorOffset = fpux->ErrorOffset;
791 fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
792 fpu->DataOffset = fpux->DataOffset;
793 fpu->DataSelector = fpux->DataSelector;
794 fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
796 stack_top = (fpux->StatusWord >> 11) & 7;
797 fpu->TagWord = 0xffff0000;
798 for (i = 0; i < 8; i++)
800 memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
801 if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
804 const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
805 if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
807 tag = 2; /* special */
809 else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
811 if (reg->Low) tag = 2; /* special */
812 else tag = 1; /* zero */
816 if (reg->Low >> 63) tag = 0; /* valid */
817 else tag = 2; /* special */
820 fpu->TagWord |= tag << (2 * i);
825 /***********************************************************************
828 * Build a context structure from the signal info.
830 static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
832 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
833 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
834 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
836 memset(context, 0, sizeof(*context));
837 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
838 context->Eax = EAX_sig(sigcontext);
839 context->Ebx = EBX_sig(sigcontext);
840 context->Ecx = ECX_sig(sigcontext);
841 context->Edx = EDX_sig(sigcontext);
842 context->Esi = ESI_sig(sigcontext);
843 context->Edi = EDI_sig(sigcontext);
844 context->Ebp = EBP_sig(sigcontext);
845 context->EFlags = EFL_sig(sigcontext);
846 context->Eip = EIP_sig(sigcontext);
847 context->Esp = ESP_sig(sigcontext);
848 context->SegCs = LOWORD(CS_sig(sigcontext));
849 context->SegDs = LOWORD(DS_sig(sigcontext));
850 context->SegEs = LOWORD(ES_sig(sigcontext));
853 context->SegSs = LOWORD(SS_sig(sigcontext));
854 context->Dr0 = regs->dr0;
855 context->Dr1 = regs->dr1;
856 context->Dr2 = regs->dr2;
857 context->Dr3 = regs->dr3;
858 context->Dr6 = regs->dr6;
859 context->Dr7 = regs->dr7;
863 context->ContextFlags |= CONTEXT_FLOATING_POINT;
864 context->FloatSave = *fpu;
868 context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
869 memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
871 if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
873 if (!fpu && !fpux) save_fpu( context );
877 /***********************************************************************
880 * Restore the signal info from the context.
882 static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
884 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
885 FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
886 XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
888 regs->dr0 = context->Dr0;
889 regs->dr1 = context->Dr1;
890 regs->dr2 = context->Dr2;
891 regs->dr3 = context->Dr3;
892 regs->dr6 = context->Dr6;
893 regs->dr7 = context->Dr7;
894 EAX_sig(sigcontext) = context->Eax;
895 EBX_sig(sigcontext) = context->Ebx;
896 ECX_sig(sigcontext) = context->Ecx;
897 EDX_sig(sigcontext) = context->Edx;
898 ESI_sig(sigcontext) = context->Esi;
899 EDI_sig(sigcontext) = context->Edi;
900 EBP_sig(sigcontext) = context->Ebp;
901 EFL_sig(sigcontext) = context->EFlags;
902 EIP_sig(sigcontext) = context->Eip;
903 ESP_sig(sigcontext) = context->Esp;
904 CS_sig(sigcontext) = context->SegCs;
905 DS_sig(sigcontext) = context->SegDs;
906 ES_sig(sigcontext) = context->SegEs;
907 SS_sig(sigcontext) = context->SegSs;
909 GS_sig(sigcontext) = context->SegGs;
911 wine_set_gs( context->SegGs );
914 FS_sig(sigcontext) = context->SegFs;
916 wine_set_fs( context->SegFs );
919 if (fpu) *fpu = context->FloatSave;
920 if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
921 if (!fpu && !fpux) restore_fpu( context );
925 /***********************************************************************
926 * RtlCaptureContext (NTDLL.@)
928 void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
931 if (fpux_support) save_fpux( context );
932 else save_fpu( context );
934 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
937 /***********************************************************************
940 * Set the new CPU context. Used by NtSetContextThread.
942 void set_cpu_context( const CONTEXT *context )
944 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
946 if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
947 else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
949 if (flags & CONTEXT_DEBUG_REGISTERS)
951 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
952 regs->dr0 = context->Dr0;
953 regs->dr1 = context->Dr1;
954 regs->dr2 = context->Dr2;
955 regs->dr3 = context->Dr3;
956 regs->dr6 = context->Dr6;
957 regs->dr7 = context->Dr7;
959 if (flags & CONTEXT_FULL)
961 if (!(flags & CONTEXT_CONTROL))
962 FIXME( "setting partial context (%x) not supported\n", flags );
963 else if (flags & CONTEXT_SEGMENTS)
964 __wine_call_from_32_restore_regs( context );
967 CONTEXT newcontext = *context;
968 newcontext.SegDs = wine_get_ds();
969 newcontext.SegEs = wine_get_es();
970 newcontext.SegFs = wine_get_fs();
971 newcontext.SegGs = wine_get_gs();
972 __wine_call_from_32_restore_regs( &newcontext );
978 /***********************************************************************
979 * is_privileged_instr
981 * Check if the fault location is a privileged instruction.
982 * Based on the instruction emulation code in dlls/kernel/instr.c.
984 static inline DWORD is_privileged_instr( CONTEXT86 *context )
987 unsigned int prefix_count = 0;
989 if (!wine_ldt_is_system( context->SegCs )) return 0;
990 instr = (BYTE *)context->Eip;
992 for (;;) switch(*instr)
994 /* instruction prefixes */
995 case 0x2e: /* %cs: */
996 case 0x36: /* %ss: */
997 case 0x3e: /* %ds: */
998 case 0x26: /* %es: */
999 case 0x64: /* %fs: */
1000 case 0x65: /* %gs: */
1001 case 0x66: /* opcode size */
1002 case 0x67: /* addr size */
1003 case 0xf0: /* lock */
1004 case 0xf2: /* repne */
1005 case 0xf3: /* repe */
1006 if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
1010 case 0x0f: /* extended instruction */
1013 case 0x20: /* mov crX, reg */
1014 case 0x21: /* mov drX, reg */
1015 case 0x22: /* mov reg, crX */
1016 case 0x23: /* mov reg drX */
1017 return EXCEPTION_PRIV_INSTRUCTION;
1020 case 0x6c: /* insb (%dx) */
1021 case 0x6d: /* insl (%dx) */
1022 case 0x6e: /* outsb (%dx) */
1023 case 0x6f: /* outsl (%dx) */
1024 case 0xcd: /* int $xx */
1025 case 0xe4: /* inb al,XX */
1026 case 0xe5: /* in (e)ax,XX */
1027 case 0xe6: /* outb XX,al */
1028 case 0xe7: /* out XX,(e)ax */
1029 case 0xec: /* inb (%dx),%al */
1030 case 0xed: /* inl (%dx),%eax */
1031 case 0xee: /* outb %al,(%dx) */
1032 case 0xef: /* outl %eax,(%dx) */
1033 case 0xf4: /* hlt */
1034 case 0xfa: /* cli */
1035 case 0xfb: /* sti */
1036 return EXCEPTION_PRIV_INSTRUCTION;
1043 #include "pshpack1.h"
1046 DWORD movl; /* movl this,4(%esp) */
1048 BYTE jmp; /* jmp func */
1051 #include "poppack.h"
1053 /**********************************************************************
1056 * Check if code destination is an ATL thunk, and emulate it if so.
1058 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
1060 const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
1065 if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
1067 *((DWORD *)context->Esp + 1) = thunk->this;
1068 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
1069 TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
1070 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
1083 /***********************************************************************
1084 * setup_exception_record
1086 * Setup the exception record and context on the thread stack.
1088 static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
1089 WORD fs, WORD gs, raise_func func )
1093 void *ret_addr; /* return address from raise_func */
1094 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
1095 CONTEXT *context_ptr; /* second arg for raise_func */
1097 EXCEPTION_RECORD rec;
1100 } *stack = stack_ptr;
1101 DWORD exception_code = 0;
1103 /* stack sanity checks */
1105 if ((char *)stack >= (char *)get_signal_stack() &&
1106 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
1108 WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
1109 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1110 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1111 NtCurrentTeb()->Tib.StackBase );
1112 server_abort_thread(1);
1115 if (stack - 1 > stack || /* check for overflow in subtraction */
1116 (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
1117 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
1119 WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
1120 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1121 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
1122 NtCurrentTeb()->Tib.StackBase );
1124 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
1126 /* stack overflow on last page, unrecoverable */
1127 UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
1128 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1129 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1130 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1131 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1132 server_abort_thread(1);
1134 else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
1136 /* stack access below stack limit, may be recoverable */
1137 if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
1140 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
1141 WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
1142 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
1143 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
1144 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
1145 server_abort_thread(1);
1149 stack--; /* push the stack_layout structure */
1150 #if defined(VALGRIND_MAKE_MEM_UNDEFINED)
1151 VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
1152 #elif defined(VALGRIND_MAKE_WRITABLE)
1153 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
1155 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
1156 stack->rec_ptr = &stack->rec;
1157 stack->context_ptr = &stack->context;
1159 stack->rec.ExceptionRecord = NULL;
1160 stack->rec.ExceptionCode = exception_code;
1161 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1162 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
1163 stack->rec.NumberParameters = 0;
1165 save_context( &stack->context, sigcontext, fs, gs );
1167 /* now modify the sigcontext to return to the raise function */
1168 ESP_sig(sigcontext) = (DWORD)stack;
1169 EIP_sig(sigcontext) = (DWORD)func;
1170 /* clear single-step, direction, and align check flag */
1171 EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
1172 CS_sig(sigcontext) = wine_get_cs();
1173 DS_sig(sigcontext) = wine_get_ds();
1174 ES_sig(sigcontext) = wine_get_es();
1175 FS_sig(sigcontext) = wine_get_fs();
1176 GS_sig(sigcontext) = wine_get_gs();
1177 SS_sig(sigcontext) = wine_get_ss();
1179 return stack->rec_ptr;
1183 /***********************************************************************
1186 * Setup a proper stack frame for the raise function, and modify the
1187 * sigcontext so that the return from the signal handler will call
1188 * the raise function.
1190 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
1193 void *stack = init_handler( sigcontext, &fs, &gs );
1195 return setup_exception_record( sigcontext, stack, fs, gs, func );
1199 /***********************************************************************
1200 * get_exception_context
1202 * Get a pointer to the context built by setup_exception.
1204 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
1206 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
1210 /**********************************************************************
1213 * Get the FPU exception code from the FPU status.
1215 static inline DWORD get_fpu_code( const CONTEXT *context )
1217 DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);
1219 if (status & 0x01) /* IE */
1221 if (status & 0x40) /* SF */
1222 return EXCEPTION_FLT_STACK_CHECK;
1224 return EXCEPTION_FLT_INVALID_OPERATION;
1226 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
1227 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
1228 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
1229 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
1230 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
1231 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
1235 /**********************************************************************
1236 * raise_segv_exception
1238 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1240 switch(rec->ExceptionCode)
1242 case EXCEPTION_ACCESS_VIOLATION:
1243 if (rec->NumberParameters == 2)
1245 if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
1247 if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
1248 rec->ExceptionInformation[0] )))
1252 case EXCEPTION_DATATYPE_MISALIGNMENT:
1253 /* FIXME: pass through exception handler first? */
1254 if (context->EFlags & 0x00040000)
1256 /* Disable AC flag, return */
1257 context->EFlags &= ~0x00040000;
1262 __regs_RtlRaiseException( rec, context );
1264 NtSetContextThread( GetCurrentThread(), context );
1268 /**********************************************************************
1269 * raise_trap_exception
1271 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1273 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1275 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
1277 /* when single stepping can't tell whether this is a hw bp or a
1278 * single step interrupt. try to avoid as much overhead as possible
1279 * and only do a server call if there is any hw bp enabled. */
1281 if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) )
1283 /* (possible) hardware breakpoint, fetch the debug registers */
1284 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1285 NtGetContextThread(GetCurrentThread(), context);
1286 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1289 context->EFlags &= ~0x100; /* clear single-step flag */
1292 __regs_RtlRaiseException( rec, context );
1293 NtSetContextThread( GetCurrentThread(), context );
1297 /**********************************************************************
1300 * Generic raise function for exceptions that don't need special treatment.
1302 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1304 __regs_RtlRaiseException( rec, context );
1305 NtSetContextThread( GetCurrentThread(), context );
1310 /**********************************************************************
1311 * raise_vm86_sti_exception
1313 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1315 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1316 get_vm86_teb_info()->vm86_pending |= VIP_FLAG;
1318 if (ntdll_get_thread_data()->vm86_ptr)
1320 if (((char*)context->Eip >= (char*)vm86_return) &&
1321 ((char*)context->Eip <= (char*)vm86_return_end) &&
1322 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1323 /* exiting from VM86, can't throw */
1326 merge_vm86_pending_flags( rec );
1328 else if (get_vm86_teb_info()->dpmi_vif &&
1329 !wine_ldt_is_system(context->SegCs) &&
1330 !wine_ldt_is_system(context->SegSs))
1332 /* Executing DPMI code and virtual interrupts are enabled. */
1333 get_vm86_teb_info()->vm86_pending = 0;
1334 __regs_RtlRaiseException( rec, context );
1337 NtSetContextThread( GetCurrentThread(), context );
1341 /**********************************************************************
1344 * Handler for SIGUSR2.
1345 * We use it to signal that the running __wine_enter_vm86() should
1346 * immediately set VIP_FLAG, causing pending events to be handled
1347 * as early as possible.
1349 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1351 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1352 rec->ExceptionCode = EXCEPTION_VM86_STI;
1354 #endif /* __HAVE_VM86 */
1357 /**********************************************************************
1360 * Handler for SIGSEGV and related errors.
1362 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1365 EXCEPTION_RECORD *rec;
1366 SIGCONTEXT *context = sigcontext;
1367 void *stack = init_handler( sigcontext, &fs, &gs );
1369 /* check for page fault inside the thread stack */
1370 if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
1371 (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
1372 (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
1373 virtual_handle_stack_fault( siginfo->si_addr ))
1375 /* check if this was the last guard page */
1376 if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
1378 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1379 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1384 rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
1385 if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;
1387 switch(get_trap_code(context))
1389 case TRAP_x86_OFLOW: /* Overflow exception */
1390 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1392 case TRAP_x86_BOUND: /* Bound range exception */
1393 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1395 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1396 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1398 case TRAP_x86_STKFLT: /* Stack fault */
1399 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1401 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1402 case TRAP_x86_PROTFLT: /* General protection fault */
1403 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1405 WORD err = get_error_code(context);
1406 if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
1407 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1408 rec->NumberParameters = 2;
1409 rec->ExceptionInformation[0] = 0;
1410 /* if error contains a LDT selector, use that as fault address */
1411 if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
1412 rec->ExceptionInformation[1] = err & ~7;
1414 rec->ExceptionInformation[1] = 0xffffffff;
1417 case TRAP_x86_PAGEFLT: /* Page fault */
1418 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1419 rec->NumberParameters = 2;
1420 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1421 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1423 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1424 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1427 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1429 case TRAP_x86_NMI: /* NMI interrupt */
1430 case TRAP_x86_DNA: /* Device not available exception */
1431 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1432 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1433 case TRAP_x86_MCHK: /* Machine check exception */
1434 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1435 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1441 /**********************************************************************
1444 * Handler for SIGTRAP.
1446 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1448 SIGCONTEXT *context = sigcontext;
1449 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1451 switch(get_trap_code(context))
1453 case TRAP_x86_TRCTRAP: /* Single-step exception */
1454 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1456 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1457 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1460 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1466 /**********************************************************************
1469 * Handler for SIGFPE.
1471 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1473 CONTEXT *win_context;
1474 SIGCONTEXT *context = sigcontext;
1475 EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1477 win_context = get_exception_context( rec );
1479 switch(get_trap_code(context))
1481 case TRAP_x86_DIVIDE: /* Division by zero exception */
1482 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1484 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1485 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1487 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1488 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1489 rec->ExceptionCode = get_fpu_code( win_context );
1490 rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
1492 case TRAP_x86_CACHEFLT: /* SIMD exception */
1494 * Behaviour only tested for divide-by-zero exceptions
1495 * Check for other SIMD exceptions as well */
1496 if(siginfo->si_code != FPE_FLTDIV)
1497 FIXME("untested SIMD exception: %#x. Might not work correctly\n",
1500 rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
1501 rec->NumberParameters = 1;
1502 /* no idea what meaning is actually behind this but that's what native does */
1503 rec->ExceptionInformation[0] = 0;
1506 WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1507 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1513 /**********************************************************************
1516 * Handler for SIGINT.
1518 * FIXME: should not be calling external functions on the signal stack.
1520 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1523 init_handler( sigcontext, &fs, &gs );
1524 if (!dispatch_signal(SIGINT))
1526 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1527 rec->ExceptionCode = CONTROL_C_EXIT;
1531 /**********************************************************************
1534 * Handler for SIGABRT.
1536 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1538 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1539 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1540 rec->ExceptionFlags = EH_NONCONTINUABLE;
1544 /**********************************************************************
1547 * Handler for SIGQUIT.
1549 static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1552 init_handler( sigcontext, &fs, &gs );
1553 server_abort_thread(0);
1557 /**********************************************************************
1560 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1562 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1567 init_handler( sigcontext, &fs, &gs );
1568 save_context( &context, sigcontext, fs, gs );
1569 wait_suspend( &context );
1570 restore_context( &context, sigcontext );
1574 /**********************************************************************
1575 * get_signal_stack_total_size
1577 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1578 * Must be a power of two.
1580 size_t get_signal_stack_total_size(void)
1582 if (!signal_stack_size)
1584 size_t size = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 );
1585 /* find the first power of two not smaller than min_size */
1586 while (size < min_size) size *= 2;
1587 signal_stack_mask = size - 1;
1588 signal_stack_size = size - teb_size;
1590 return signal_stack_size + teb_size;
1594 /***********************************************************************
1595 * __wine_set_signal_handler (NTDLL.@)
1597 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1599 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1600 if (handlers[sig] != NULL) return -2;
1601 handlers[sig] = wsh;
1606 /**********************************************************************
1607 * signal_init_thread
1609 void signal_init_thread( TEB *teb )
1611 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
1616 int mib[2], val = 1;
1619 mib[1] = KERN_THALTSTACK;
1620 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1623 ss.ss_sp = (char *)teb + teb_size;
1624 ss.ss_size = signal_stack_size;
1626 if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );
1628 wine_ldt_set_base( &fs_entry, teb );
1629 wine_ldt_set_limit( &fs_entry, teb_size - 1 );
1630 wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
1631 wine_ldt_init_fs( thread_data->fs, &fs_entry );
1632 thread_data->gs = wine_get_gs();
1635 /**********************************************************************
1636 * signal_init_process
1638 void signal_init_process(void)
1640 struct sigaction sig_act;
1642 sig_act.sa_mask = server_block_set;
1643 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1645 sig_act.sa_flags |= SA_ONSTACK;
1648 sig_act.sa_sigaction = int_handler;
1649 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1650 sig_act.sa_sigaction = fpe_handler;
1651 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1652 sig_act.sa_sigaction = abrt_handler;
1653 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1654 sig_act.sa_sigaction = quit_handler;
1655 if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
1656 sig_act.sa_sigaction = usr1_handler;
1657 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1659 sig_act.sa_sigaction = segv_handler;
1660 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1661 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1663 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1667 sig_act.sa_sigaction = trap_handler;
1668 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1672 sig_act.sa_sigaction = usr2_handler;
1673 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1679 perror("sigaction");
1685 /**********************************************************************
1686 * __wine_enter_vm86 (NTDLL.@)
1688 * Enter vm86 mode with the specified register context.
1690 void __wine_enter_vm86( CONTEXT *context )
1692 EXCEPTION_RECORD rec;
1694 struct vm86plus_struct vm86;
1696 memset( &vm86, 0, sizeof(vm86) );
1699 restore_vm86_context( context, &vm86 );
1701 ntdll_get_thread_data()->vm86_ptr = &vm86;
1702 merge_vm86_pending_flags( &rec );
1704 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1711 save_vm86_context( context, &vm86 );
1713 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1714 rec.ExceptionRecord = NULL;
1715 rec.ExceptionAddress = (LPVOID)context->Eip;
1716 rec.NumberParameters = 0;
1718 switch(VM86_TYPE(res))
1720 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1721 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1723 case VM86_TRAP: /* return due to DOS-debugger request */
1724 switch(VM86_ARG(res))
1726 case TRAP_x86_TRCTRAP: /* Single-step exception */
1727 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1729 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1730 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1733 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1737 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1738 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1739 rec.NumberParameters = 1;
1740 rec.ExceptionInformation[0] = VM86_ARG(res);
1742 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1743 context->EFlags |= VIF_FLAG;
1744 context->EFlags &= ~VIP_FLAG;
1745 get_vm86_teb_info()->vm86_pending = 0;
1746 rec.ExceptionCode = EXCEPTION_VM86_STI;
1748 case VM86_PICRETURN: /* return due to pending PIC request */
1749 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1751 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1753 WINE_ERR( "unhandled result from vm86 mode %x\n", res );
1756 __regs_RtlRaiseException( &rec, context );
1760 #else /* __HAVE_VM86 */
1761 /**********************************************************************
1762 * __wine_enter_vm86 (NTDLL.@)
1764 void __wine_enter_vm86( CONTEXT *context )
1766 MESSAGE("vm86 mode not supported on this platform\n");
1768 #endif /* __HAVE_VM86 */
1770 /**********************************************************************
1771 * DbgBreakPoint (NTDLL.@)
1773 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
1775 /**********************************************************************
1776 * DbgUserBreakPoint (NTDLL.@)
1778 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
1780 /**********************************************************************
1781 * NtCurrentTeb (NTDLL.@)
1783 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )
1786 /**********************************************************************
1787 * EXC_CallHandler (internal)
1789 * Some exception handlers depend on EBP to have a fixed position relative to
1790 * the exception frame.
1791 * Shrinker depends on (*1) doing what it does,
1792 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1793 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1794 * function calling the handler having only 5 parameters (*4).
1796 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1798 " movl %esp, %ebp\n"
1800 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1806 " call " __ASM_NAME("call_exception_handler") "\n"
1811 __ASM_GLOBAL_FUNC(call_exception_handler,
1813 " movl %esp, %ebp\n"
1815 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1816 " pushl %edx\n" /* handler be handled by... */
1818 " pushl (0)\n" /* nested_handler (passed in edx). */
1820 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1825 " movl 24(%ebp), %ecx\n" /* (*1) */
1826 " call *%ecx\n" /* call handler. (*2) */
1828 " movl (0), %esp\n" /* restore previous... (*3) */
1830 " popl (0)\n" /* exception frame. */
1831 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1833 " ret $20\n" /* (*4) */
1835 #endif /* __i386__ */