/* * i386 signal handling routines * * Copyright 1999 Alexandre Julliard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifdef __i386__ #include "config.h" #include "wine/port.h" #include #include #include #include #include #ifdef HAVE_UNISTD_H # include #endif #ifdef HAVE_SYS_PARAM_H # include #endif #ifdef HAVE_SYSCALL_H # include #else # ifdef HAVE_SYS_SYSCALL_H # include # endif #endif #ifdef HAVE_SYS_VM86_H # include #endif #ifdef HAVE_SYS_SIGNAL_H # include #endif #include "windef.h" #include "thread.h" #include "wine/library.h" #include "ntdll_misc.h" /*********************************************************************** * signal context platform-specific definitions */ #ifdef linux typedef struct { unsigned short sc_gs, __gsh; unsigned short sc_fs, __fsh; unsigned short sc_es, __esh; unsigned short sc_ds, __dsh; unsigned long sc_edi; unsigned long sc_esi; unsigned long sc_ebp; unsigned long sc_esp; unsigned long sc_ebx; unsigned long sc_edx; unsigned long sc_ecx; unsigned long sc_eax; unsigned long sc_trapno; unsigned long sc_err; unsigned long sc_eip; unsigned short sc_cs, __csh; unsigned long sc_eflags; unsigned long esp_at_signal; unsigned short sc_ss, __ssh; unsigned long i387; unsigned long oldmask; unsigned long cr2; } SIGCONTEXT; #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context ) #define HANDLER_CONTEXT (&__context) /* this is the sigaction structure from the Linux 2.1.20 kernel. */ struct kernel_sigaction { void (*ksa_handler)(); unsigned long ksa_mask; unsigned long ksa_flags; void *ksa_restorer; }; /* Similar to the sigaction function in libc, except it leaves alone the restorer field, which is used to specify the signal stack address */ static inline int wine_sigaction( int sig, struct kernel_sigaction *new, struct kernel_sigaction *old ) { __asm__ __volatile__( "pushl %%ebx\n\t" "movl %2,%%ebx\n\t" "int $0x80\n\t" "popl %%ebx" : "=a" (sig) : "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) ); if (sig>=0) return 0; errno = -sig; return -1; } #ifdef HAVE_SIGALTSTACK /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */ static inline int wine_sigaltstack( const struct sigaltstack *new, struct sigaltstack *old ) { int ret; __asm__ __volatile__( "pushl %%ebx\n\t" "movl %2,%%ebx\n\t" "int $0x80\n\t" "popl %%ebx" : "=a" (ret) : "0" (SYS_sigaltstack), "q" (new), "c" (old) ); if (ret >= 0) return 0; errno = -ret; return -1; } #endif #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */ int vm86_enter( void **vm86_ptr ); void vm86_return(void); void vm86_return_end(void); __ASM_GLOBAL_FUNC(vm86_enter, "pushl %ebp\n\t" "movl %esp, %ebp\n\t" "movl $166,%eax\n\t" /*SYS_vm86*/ "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */ "movl (%ecx),%ecx\n\t" "pushl %ebx\n\t" "movl $1,%ebx\n\t" /*VM86_ENTER*/ "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */ "pushl %fs\n\t" "pushl %gs\n\t" "int $0x80\n" ".globl " __ASM_NAME("vm86_return") "\n\t" __ASM_FUNC("vm86_return") "\n" __ASM_NAME("vm86_return") ":\n\t" "popl %gs\n\t" "popl %fs\n\t" "popl %ecx\n\t" "popl %ebx\n\t" "popl %ebp\n\t" "testl %eax,%eax\n\t" "jl 0f\n\t" "cmpb $0,%al\n\t" /* VM86_SIGNAL */ "je " __ASM_NAME("vm86_enter") "\n\t" "0:\n\t" "movl 4(%esp),%ecx\n\t" /* vm86_ptr */ "movl $0,(%ecx)\n\t" ".globl " __ASM_NAME("vm86_return_end") "\n\t" __ASM_FUNC("vm86_return_end") "\n" __ASM_NAME("vm86_return_end") ":\n\t" "ret" ); #ifdef HAVE_SYS_VM86_H # define __HAVE_VM86 #endif #endif /* linux */ #ifdef BSDI #define EAX_sig(context) ((context)->tf_eax) #define EBX_sig(context) ((context)->tf_ebx) #define ECX_sig(context) ((context)->tf_ecx) #define EDX_sig(context) ((context)->tf_edx) #define ESI_sig(context) ((context)->tf_esi) #define EDI_sig(context) ((context)->tf_edi) #define EBP_sig(context) ((context)->tf_ebp) #define CS_sig(context) ((context)->tf_cs) #define DS_sig(context) ((context)->tf_ds) #define ES_sig(context) ((context)->tf_es) #define SS_sig(context) ((context)->tf_ss) #include typedef struct trapframe SIGCONTEXT; #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context ) #define HANDLER_CONTEXT __context #define EFL_sig(context) ((context)->tf_eflags) #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip)) #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp)) #endif /* bsdi */ #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) typedef struct sigcontext SIGCONTEXT; #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context ) #define HANDLER_CONTEXT __context #endif /* *BSD */ #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun) #ifdef _SCO_DS #include #endif /* Solaris kludge */ #undef ERR #include #undef ERR typedef struct ucontext SIGCONTEXT; #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context ) #define HANDLER_CONTEXT __context #endif /* svr4 || SCO_DS */ #ifdef __EMX__ typedef struct { unsigned long ContextFlags; FLOATING_SAVE_AREA sc_float; unsigned long sc_gs; unsigned long sc_fs; unsigned long sc_es; unsigned long sc_ds; unsigned long sc_edi; unsigned long sc_esi; unsigned long sc_eax; unsigned long sc_ebx; unsigned long sc_ecx; unsigned long sc_edx; unsigned long sc_ebp; unsigned long sc_eip; unsigned long sc_cs; unsigned long sc_eflags; unsigned long sc_esp; unsigned long sc_ss; } SIGCONTEXT; #endif /* __EMX__ */ #ifdef __CYGWIN__ /* FIXME: This section is just here so it can compile, it's most likely * completely wrong. */ typedef struct { unsigned short sc_gs, __gsh; unsigned short sc_fs, __fsh; unsigned short sc_es, __esh; unsigned short sc_ds, __dsh; unsigned long sc_edi; unsigned long sc_esi; unsigned long sc_ebp; unsigned long sc_esp; unsigned long sc_ebx; unsigned long sc_edx; unsigned long sc_ecx; unsigned long sc_eax; unsigned long sc_trapno; unsigned long sc_err; unsigned long sc_eip; unsigned short sc_cs, __csh; unsigned long sc_eflags; unsigned long esp_at_signal; unsigned short sc_ss, __ssh; unsigned long i387; unsigned long oldmask; unsigned long cr2; } SIGCONTEXT; #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context ) #define HANDLER_CONTEXT (&__context) #endif /* __CYGWIN__ */ #ifdef __APPLE__ # include # include # include typedef siginfo_t siginfo; typedef struct sigcontext SIGCONTEXT; #define EAX_sig(context) ((context)->sc_eax) #define EBX_sig(context) ((context)->sc_ebx) #define ECX_sig(context) ((context)->sc_ecx) #define EDX_sig(context) ((context)->sc_edx) #define ESI_sig(context) ((context)->sc_esi) #define EDI_sig(context) ((context)->sc_edi) #define EBP_sig(context) ((context)->sc_ebp) #define CS_sig(context) ((context)->sc_cs) #define DS_sig(context) ((context)->sc_ds) #define ES_sig(context) ((context)->sc_es) #define FS_sig(context) ((context)->sc_fs) #define GS_sig(context) ((context)->sc_gs) #define SS_sig(context) ((context)->sc_ss) #define EFL_sig(context) ((context)->sc_eflags) #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip)) #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp)) # define HANDLER_DEF(name) void name( int __signal, siginfo *__siginfo, SIGCONTEXT *__context ) # define HANDLER_CONTEXT (__context) #endif /* __APPLE__ */ #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\ defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__) #define EAX_sig(context) ((context)->sc_eax) #define EBX_sig(context) ((context)->sc_ebx) #define ECX_sig(context) ((context)->sc_ecx) #define EDX_sig(context) ((context)->sc_edx) #define ESI_sig(context) ((context)->sc_esi) #define EDI_sig(context) ((context)->sc_edi) #define EBP_sig(context) ((context)->sc_ebp) #define CS_sig(context) ((context)->sc_cs) #define DS_sig(context) ((context)->sc_ds) #define ES_sig(context) ((context)->sc_es) #define FS_sig(context) ((context)->sc_fs) #define GS_sig(context) ((context)->sc_gs) #define SS_sig(context) ((context)->sc_ss) #define TRAP_sig(context) ((context)->sc_trapno) #ifdef __NetBSD__ #define ERROR_sig(context) ((context)->sc_err) #endif #ifdef linux #define ERROR_sig(context) ((context)->sc_err) #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387)) #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2) #endif #ifdef __FreeBSD__ #define EFL_sig(context) ((context)->sc_efl) /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */ #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err) #else #define EFL_sig(context) ((context)->sc_eflags) #endif #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip)) #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp)) #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */ #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun) #ifdef _SCO_DS #define gregs regs #endif #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX]) #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX]) #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX]) #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX]) #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI]) #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI]) #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP]) #define CS_sig(context) ((context)->uc_mcontext.gregs[CS]) #define DS_sig(context) ((context)->uc_mcontext.gregs[DS]) #define ES_sig(context) ((context)->uc_mcontext.gregs[ES]) #define SS_sig(context) ((context)->uc_mcontext.gregs[SS]) #define FS_sig(context) ((context)->uc_mcontext.gregs[FS]) #define GS_sig(context) ((context)->uc_mcontext.gregs[GS]) #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL]) #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP]) #ifdef UESP #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP]) #elif defined(R_ESP) #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP]) #else #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP]) #endif #ifdef TRAPNO #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO]) #endif #define FAULT_ADDRESS (__siginfo->si_addr) #endif /* svr4 || SCO_DS */ /* exception code definitions (already defined by FreeBSD/NetBSD) */ #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */ #define T_DIVIDE 0 /* Division by zero exception */ #define T_TRCTRAP 1 /* Single-step exception */ #define T_NMI 2 /* NMI interrupt */ #define T_BPTFLT 3 /* Breakpoint exception */ #define T_OFLOW 4 /* Overflow exception */ #define T_BOUND 5 /* Bound range exception */ #define T_PRIVINFLT 6 /* Invalid opcode exception */ #define T_DNA 7 /* Device not available exception */ #define T_DOUBLEFLT 8 /* Double fault exception */ #define T_FPOPFLT 9 /* Coprocessor segment overrun */ #define T_TSSFLT 10 /* Invalid TSS exception */ #define T_SEGNPFLT 11 /* Segment not present exception */ #define T_STKFLT 12 /* Stack fault */ #define T_PROTFLT 13 /* General protection fault */ #define T_PAGEFLT 14 /* Page fault */ #define T_RESERVED 15 /* Unknown exception */ #define T_ARITHTRAP 16 /* Floating point exception */ #define T_ALIGNFLT 17 /* Alignment check exception */ #define T_MCHK 18 /* Machine check exception */ #define T_CACHEFLT 19 /* Cache flush exception */ #endif #if defined(__NetBSD__) #define T_MCHK 19 /* Machine check exception */ #endif #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */ #include "wine/exception.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(seh); typedef int (*wine_signal_handler)(unsigned int sig); static size_t signal_stack_mask; static size_t signal_stack_size; static wine_signal_handler handlers[256]; extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context ); /*********************************************************************** * dispatch_signal */ inline static int dispatch_signal(unsigned int sig) { if (handlers[sig] == NULL) return 0; return handlers[sig](sig); } /*********************************************************************** * get_trap_code * * Get the trap code for a signal. */ static inline int get_trap_code( const SIGCONTEXT *sigcontext ) { #ifdef TRAP_sig return TRAP_sig(sigcontext); #else return T_UNKNOWN; /* unknown trap code */ #endif } /*********************************************************************** * get_error_code * * Get the error code for a signal. */ static inline int get_error_code( const SIGCONTEXT *sigcontext ) { #ifdef ERROR_sig return ERROR_sig(sigcontext); #else return 0; #endif } /*********************************************************************** * get_signal_stack * * Get the base of the signal stack for the current thread. */ static inline void *get_signal_stack(void) { return (char *)NtCurrentTeb() + 4096; } /*********************************************************************** * get_current_teb * * Get the current teb based on the stack pointer. */ static inline TEB *get_current_teb(void) { unsigned long esp; __asm__("movl %%esp,%0" : "=g" (esp) ); return (TEB *)(esp & ~signal_stack_mask); } #ifdef __HAVE_VM86 /*********************************************************************** * save_vm86_context * * Set the register values from a vm86 structure. */ static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 ) { context->Eax = vm86->regs.eax; context->Ebx = vm86->regs.ebx; context->Ecx = vm86->regs.ecx; context->Edx = vm86->regs.edx; context->Esi = vm86->regs.esi; context->Edi = vm86->regs.edi; context->Esp = vm86->regs.esp; context->Ebp = vm86->regs.ebp; context->Eip = vm86->regs.eip; context->SegCs = vm86->regs.cs; context->SegDs = vm86->regs.ds; context->SegEs = vm86->regs.es; context->SegFs = vm86->regs.fs; context->SegGs = vm86->regs.gs; context->SegSs = vm86->regs.ss; context->EFlags = vm86->regs.eflags; } /*********************************************************************** * restore_vm86_context * * Build a vm86 structure from the register values. */ static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 ) { vm86->regs.eax = context->Eax; vm86->regs.ebx = context->Ebx; vm86->regs.ecx = context->Ecx; vm86->regs.edx = context->Edx; vm86->regs.esi = context->Esi; vm86->regs.edi = context->Edi; vm86->regs.esp = context->Esp; vm86->regs.ebp = context->Ebp; vm86->regs.eip = context->Eip; vm86->regs.cs = context->SegCs; vm86->regs.ds = context->SegDs; vm86->regs.es = context->SegEs; vm86->regs.fs = context->SegFs; vm86->regs.gs = context->SegGs; vm86->regs.ss = context->SegSs; vm86->regs.eflags = context->EFlags; } /********************************************************************** * merge_vm86_pending_flags * * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and * raises exception if there are pending events and VIF flag * has been turned on. * * Called from __wine_enter_vm86 because vm86_enter * doesn't check for pending events. * * Called from raise_vm86_sti_exception to check for * pending events in a signal safe way. */ static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec ) { BOOL check_pending = TRUE; struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr); /* * In order to prevent a race when SIGUSR2 occurs while * we are returning from exception handler, pending events * will be rechecked after each raised exception. */ while (check_pending && NtCurrentTeb()->vm86_pending) { check_pending = FALSE; ntdll_get_thread_data()->vm86_ptr = NULL; /* * If VIF is set, throw exception. * Note that SIGUSR2 may turn VIF flag off so * VIF check must occur only when TEB.vm86_ptr is NULL. */ if (vm86->regs.eflags & VIF_MASK) { CONTEXT vcontext; save_vm86_context( &vcontext, vm86 ); rec->ExceptionCode = EXCEPTION_VM86_STI; rec->ExceptionFlags = EXCEPTION_CONTINUABLE; rec->ExceptionRecord = NULL; rec->NumberParameters = 0; rec->ExceptionAddress = (LPVOID)vcontext.Eip; vcontext.EFlags &= ~VIP_MASK; NtCurrentTeb()->vm86_pending = 0; __regs_RtlRaiseException( rec, &vcontext ); restore_vm86_context( &vcontext, vm86 ); check_pending = TRUE; } ntdll_get_thread_data()->vm86_ptr = vm86; } /* * Merge VIP flags in a signal safe way. This requires * that the following operation compiles into atomic * instruction. */ vm86->regs.eflags |= NtCurrentTeb()->vm86_pending; } #endif /* __HAVE_VM86 */ typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context ); /*********************************************************************** * init_handler * * Handler initialization when the full context is not needed. */ static void *init_handler( const SIGCONTEXT *sigcontext ) { void *stack = (void *)ESP_sig(sigcontext); TEB *teb = get_current_teb(); struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2; wine_set_fs( thread_data->teb_sel ); /* now restore a proper %gs for the fault handler */ if (!wine_ldt_is_system(CS_sig(sigcontext)) || !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */ { /* * Win16 or DOS protected mode. Note that during switch * from 16-bit mode to linear mode, CS may be set to system * segment before FS is restored. Fortunately, in this case * SS is still non-system segment. This is why both CS and SS * are checked. */ wine_set_gs( teb->gs_sel ); stack = teb->WOW32Reserved; } #ifdef __HAVE_VM86 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */ { unsigned int *int_stack = stack; /* fetch the saved %gs from the stack */ wine_set_gs( int_stack[0] ); } #endif else /* 32-bit mode */ { #ifdef GS_sig wine_set_gs( GS_sig(sigcontext) ); #endif } return stack; } /*********************************************************************** * save_fpu * * Set the FPU context from a sigcontext. */ inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext ) { #ifdef FPU_sig if (FPU_sig(sigcontext)) { context->FloatSave = *FPU_sig(sigcontext); return; } #endif /* FPU_sig */ #ifdef __GNUC__ __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) ); #endif /* __GNUC__ */ } /*********************************************************************** * restore_fpu * * Restore the FPU context to a sigcontext. */ inline static void restore_fpu( CONTEXT *context ) { /* reset the current interrupt status */ context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80; #ifdef __GNUC__ /* avoid nested exceptions */ __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) ); #endif /* __GNUC__ */ } /*********************************************************************** * setup_exception * * Setup a proper stack frame for the raise function, and modify the * sigcontext so that the return from the signal handler will call * the raise function. */ static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func ) { struct stack_layout { void *ret_addr; /* return address from raise_func */ EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */ CONTEXT *context_ptr; /* second arg for raise_func */ void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */ CONTEXT context; EXCEPTION_RECORD rec; DWORD ebp; DWORD eip; } *stack; WORD fs, gs; /* get %fs and %gs at time of the fault */ #ifdef FS_sig fs = LOWORD(FS_sig(sigcontext)); #else fs = wine_get_fs(); #endif #ifdef GS_sig gs = LOWORD(GS_sig(sigcontext)); #else gs = wine_get_gs(); #endif stack = init_handler( sigcontext ); /* stack sanity checks */ if ((char *)stack >= (char *)get_signal_stack() && (char *)stack < (char *)get_signal_stack() + signal_stack_size) { ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n", GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } if (stack - 1 > stack || /* check for overflow in subtraction */ (char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 || (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase) { UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack; if (diff < 4096) { ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n", diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n", GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); } stack--; /* push the stack_layout structure */ stack->ret_addr = __wine_call_from_32_restore_regs; stack->rec_ptr = &stack->rec; stack->context_ptr = &stack->context; stack->rec.ExceptionRecord = NULL; stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE; stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext); stack->rec.NumberParameters = 0; stack->context.ContextFlags = CONTEXT_FULL; stack->context.Eax = EAX_sig(sigcontext); stack->context.Ebx = EBX_sig(sigcontext); stack->context.Ecx = ECX_sig(sigcontext); stack->context.Edx = EDX_sig(sigcontext); stack->context.Esi = ESI_sig(sigcontext); stack->context.Edi = EDI_sig(sigcontext); stack->context.Ebp = EBP_sig(sigcontext); stack->context.EFlags = EFL_sig(sigcontext); stack->context.Eip = EIP_sig(sigcontext); stack->context.Esp = ESP_sig(sigcontext); stack->context.SegCs = LOWORD(CS_sig(sigcontext)); stack->context.SegDs = LOWORD(DS_sig(sigcontext)); stack->context.SegEs = LOWORD(ES_sig(sigcontext)); stack->context.SegFs = fs; stack->context.SegGs = gs; stack->context.SegSs = LOWORD(SS_sig(sigcontext)); /* now modify the sigcontext to return to the raise function */ ESP_sig(sigcontext) = (DWORD)stack; EIP_sig(sigcontext) = (DWORD)func; CS_sig(sigcontext) = wine_get_cs(); DS_sig(sigcontext) = wine_get_ds(); ES_sig(sigcontext) = wine_get_es(); FS_sig(sigcontext) = wine_get_fs(); GS_sig(sigcontext) = wine_get_gs(); SS_sig(sigcontext) = wine_get_ss(); return stack->rec_ptr; } /*********************************************************************** * get_exception_context * * Get a pointer to the context built by setup_exception. */ static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec ) { return (CONTEXT *)rec - 1; /* cf. stack_layout structure */ } /********************************************************************** * get_fpu_code * * Get the FPU exception code from the FPU status. */ static inline DWORD get_fpu_code( const CONTEXT *context ) { DWORD status = context->FloatSave.StatusWord; if (status & 0x01) /* IE */ { if (status & 0x40) /* SF */ return EXCEPTION_FLT_STACK_CHECK; else return EXCEPTION_FLT_INVALID_OPERATION; } if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */ if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */ if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */ if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */ if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */ return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */ } /********************************************************************** * raise_segv_exception */ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { switch(rec->ExceptionCode) { case EXCEPTION_ACCESS_VIOLATION: if (rec->NumberParameters == 2) { if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] ))) return; } break; case EXCEPTION_DATATYPE_MISALIGNMENT: /* FIXME: pass through exception handler first? */ if (context->EFlags & 0x00040000) { /* Disable AC flag, return */ context->EFlags &= ~0x00040000; return; } break; } __regs_RtlRaiseException( rec, context ); } /********************************************************************** * raise_trap_exception */ static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { DWORD dr0, dr1, dr2, dr3, dr6, dr7; if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP) { if (context->EFlags & 0x100) { context->EFlags &= ~0x100; /* clear single-step flag */ } else /* hardware breakpoint, fetch the debug registers */ { context->ContextFlags = CONTEXT_DEBUG_REGISTERS; NtGetContextThread(GetCurrentThread(), context); /* do we really have a bp from a debug register ? * if not, then someone did a kill(SIGTRAP) on us, and we * shall return a breakpoint, not a single step exception */ if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT; } } dr0 = context->Dr0; dr1 = context->Dr1; dr2 = context->Dr2; dr3 = context->Dr3; dr6 = context->Dr6; dr7 = context->Dr7; __regs_RtlRaiseException( rec, context ); if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 || dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7) { /* the debug registers have changed, set the new values */ context->ContextFlags = CONTEXT_DEBUG_REGISTERS; NtSetContextThread(GetCurrentThread(), context); } } /********************************************************************** * raise_fpu_exception */ static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { __regs_RtlRaiseException( rec, context ); restore_fpu( context ); } #ifdef __HAVE_VM86 /********************************************************************** * raise_vm86_sti_exception */ static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { /* merge_vm86_pending_flags merges the vm86_pending flag in safely */ NtCurrentTeb()->vm86_pending |= VIP_MASK; if (ntdll_get_thread_data()->vm86_ptr) { if (((char*)context->Eip >= (char*)vm86_return) && ((char*)context->Eip <= (char*)vm86_return_end) && (VM86_TYPE(context->Eax) != VM86_SIGNAL)) { /* exiting from VM86, can't throw */ return; } merge_vm86_pending_flags( rec ); } else if (NtCurrentTeb()->dpmi_vif && !wine_ldt_is_system(context->SegCs) && !wine_ldt_is_system(context->SegSs)) { /* Executing DPMI code and virtual interrupts are enabled. */ NtCurrentTeb()->vm86_pending = 0; __regs_RtlRaiseException( rec, context ); } } /********************************************************************** * usr2_handler * * Handler for SIGUSR2. * We use it to signal that the running __wine_enter_vm86() should * immediately set VIP_MASK, causing pending events to be handled * as early as possible. */ static HANDLER_DEF(usr2_handler) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception ); rec->ExceptionCode = EXCEPTION_VM86_STI; } #endif /* __HAVE_VM86 */ /********************************************************************** * segv_handler * * Handler for SIGSEGV and related errors. */ static HANDLER_DEF(segv_handler) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception ); switch(get_trap_code(HANDLER_CONTEXT)) { case T_OFLOW: /* Overflow exception */ rec->ExceptionCode = EXCEPTION_INT_OVERFLOW; break; case T_BOUND: /* Bound range exception */ rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED; break; case T_PRIVINFLT: /* Invalid opcode exception */ rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; break; case T_STKFLT: /* Stack fault */ rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW; break; case T_SEGNPFLT: /* Segment not present exception */ case T_PROTFLT: /* General protection fault */ case T_UNKNOWN: /* Unknown fault code */ rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION : EXCEPTION_PRIV_INSTRUCTION; break; case T_PAGEFLT: /* Page fault */ rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION; #ifdef FAULT_ADDRESS rec->NumberParameters = 2; rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0; rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS; #endif break; case T_ALIGNFLT: /* Alignment check exception */ rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT; break; default: ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) ); /* fall through */ case T_NMI: /* NMI interrupt */ case T_DNA: /* Device not available exception */ case T_DOUBLEFLT: /* Double fault exception */ case T_TSSFLT: /* Invalid TSS exception */ case T_RESERVED: /* Unknown exception */ case T_MCHK: /* Machine check exception */ #ifdef T_CACHEFLT case T_CACHEFLT: /* Cache flush exception */ #endif rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; break; } } /********************************************************************** * trap_handler * * Handler for SIGTRAP. */ static HANDLER_DEF(trap_handler) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception ); switch(get_trap_code(HANDLER_CONTEXT)) { case T_TRCTRAP: /* Single-step exception */ rec->ExceptionCode = EXCEPTION_SINGLE_STEP; EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */ break; case T_BPTFLT: /* Breakpoint exception */ rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */ /* fall through */ default: rec->ExceptionCode = EXCEPTION_BREAKPOINT; break; } } /********************************************************************** * fpe_handler * * Handler for SIGFPE. */ static HANDLER_DEF(fpe_handler) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception ); CONTEXT *context; context = get_exception_context( rec ); save_fpu( context, HANDLER_CONTEXT ); switch(get_trap_code(HANDLER_CONTEXT)) { case T_DIVIDE: /* Division by zero exception */ rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO; break; case T_FPOPFLT: /* Coprocessor segment overrun */ rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION; break; case T_ARITHTRAP: /* Floating point exception */ case T_UNKNOWN: /* Unknown fault code */ rec->ExceptionCode = get_fpu_code( context ); break; default: ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) ); rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION; break; } } /********************************************************************** * int_handler * * Handler for SIGINT. */ static HANDLER_DEF(int_handler) { init_handler( HANDLER_CONTEXT ); if (!dispatch_signal(SIGINT)) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException ); rec->ExceptionCode = CONTROL_C_EXIT; } } /********************************************************************** * abrt_handler * * Handler for SIGABRT. */ static HANDLER_DEF(abrt_handler) { EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException ); rec->ExceptionCode = EXCEPTION_WINE_ASSERTION; rec->ExceptionFlags = EH_NONCONTINUABLE; } /********************************************************************** * term_handler * * Handler for SIGTERM. */ static HANDLER_DEF(term_handler) { init_handler( HANDLER_CONTEXT ); server_abort_thread(0); } /********************************************************************** * usr1_handler * * Handler for SIGUSR1, used to signal a thread that it got suspended. */ static HANDLER_DEF(usr1_handler) { LARGE_INTEGER timeout; init_handler( HANDLER_CONTEXT ); /* wait with 0 timeout, will only return once the thread is no longer suspended */ timeout.QuadPart = 0; NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout, 0 ); } /********************************************************************** * get_signal_stack_total_size * * Retrieve the size to allocate for the signal stack, including the TEB at the bottom. * Must be a power of two. */ size_t get_signal_stack_total_size(void) { static const size_t teb_size = 4096; /* we reserve one page for the TEB */ if (!signal_stack_size) { size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 ); /* find the first power of two not smaller than min_size */ while (size < min_size) size *= 2; signal_stack_mask = size - 1; signal_stack_size = size - teb_size; } return signal_stack_size + teb_size; } /*********************************************************************** * set_handler * * Set a signal handler */ static int set_handler( int sig, int have_sigaltstack, void (*func)() ) { struct sigaction sig_act; #ifdef linux if (!have_sigaltstack) { struct kernel_sigaction sig_act; sig_act.ksa_handler = func; sig_act.ksa_flags = SA_RESTART; sig_act.ksa_mask = (1 << (SIGINT-1)) | (1 << (SIGUSR2-1)); /* point to the top of the signal stack */ sig_act.ksa_restorer = (char *)get_signal_stack() + signal_stack_size; return wine_sigaction( sig, &sig_act, NULL ); } #endif /* linux */ sig_act.sa_handler = func; sigemptyset( &sig_act.sa_mask ); sigaddset( &sig_act.sa_mask, SIGINT ); sigaddset( &sig_act.sa_mask, SIGUSR2 ); #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) sig_act.sa_flags = SA_RESTART; #elif defined (__svr4__) || defined(_SCO_DS) sig_act.sa_flags = SA_SIGINFO | SA_RESTART; #else sig_act.sa_flags = 0; #endif #ifdef SA_ONSTACK if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK; #endif return sigaction( sig, &sig_act, NULL ); } /*********************************************************************** * __wine_set_signal_handler (NTDLL.@) */ int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh) { if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1; if (handlers[sig] != NULL) return -2; handlers[sig] = wsh; return 0; } /********************************************************************** * SIGNAL_Init */ BOOL SIGNAL_Init(void) { int have_sigaltstack = 0; #ifdef HAVE_SIGALTSTACK struct sigaltstack ss; ss.ss_sp = get_signal_stack(); ss.ss_size = signal_stack_size; ss.ss_flags = 0; if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1; #ifdef linux /* sigaltstack may fail because the kernel is too old, or because glibc is brain-dead. In the latter case a direct system call should succeed. */ else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1; #endif /* linux */ #endif /* HAVE_SIGALTSTACK */ if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error; if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error; if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error; if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error; if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error; if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error; if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error; #ifdef SIGBUS if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error; #endif #ifdef SIGTRAP if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error; #endif #ifdef __HAVE_VM86 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error; #endif return TRUE; error: perror("sigaction"); return FALSE; } #ifdef __HAVE_VM86 /********************************************************************** * __wine_enter_vm86 (NTDLL.@) * * Enter vm86 mode with the specified register context. */ void __wine_enter_vm86( CONTEXT *context ) { EXCEPTION_RECORD rec; int res; struct vm86plus_struct vm86; memset( &vm86, 0, sizeof(vm86) ); for (;;) { restore_vm86_context( context, &vm86 ); ntdll_get_thread_data()->vm86_ptr = &vm86; merge_vm86_pending_flags( &rec ); res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */ if (res < 0) { errno = -res; return; } save_vm86_context( context, &vm86 ); rec.ExceptionFlags = EXCEPTION_CONTINUABLE; rec.ExceptionRecord = NULL; rec.ExceptionAddress = (LPVOID)context->Eip; rec.NumberParameters = 0; switch(VM86_TYPE(res)) { case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */ rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION; raise_segv_exception( &rec, context ); continue; case VM86_TRAP: /* return due to DOS-debugger request */ switch(VM86_ARG(res)) { case T_TRCTRAP: /* Single-step exception, single step flag is cleared by raise_trap_exception */ rec.ExceptionCode = EXCEPTION_SINGLE_STEP; break; case T_BPTFLT: /* Breakpoint exception */ rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */ /* fall through */ default: rec.ExceptionCode = EXCEPTION_BREAKPOINT; break; } raise_trap_exception( &rec, context ); continue; case VM86_INTx: /* int3/int x instruction (ARG = x) */ rec.ExceptionCode = EXCEPTION_VM86_INTx; rec.NumberParameters = 1; rec.ExceptionInformation[0] = VM86_ARG(res); break; case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */ context->EFlags |= VIF_MASK; context->EFlags &= ~VIP_MASK; NtCurrentTeb()->vm86_pending = 0; rec.ExceptionCode = EXCEPTION_VM86_STI; break; case VM86_PICRETURN: /* return due to pending PIC request */ rec.ExceptionCode = EXCEPTION_VM86_PICRETURN; break; case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */ default: ERR( "unhandled result from vm86 mode %x\n", res ); continue; } __regs_RtlRaiseException( &rec, context ); } } #else /* __HAVE_VM86 */ /********************************************************************** * __wine_enter_vm86 (NTDLL.@) */ void __wine_enter_vm86( CONTEXT *context ) { MESSAGE("vm86 mode not supported on this platform\n"); } #endif /* __HAVE_VM86 */ /********************************************************************** * DbgBreakPoint (NTDLL.@) */ __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret"); /********************************************************************** * DbgUserBreakPoint (NTDLL.@) */ __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret"); #endif /* __i386__ */