/* * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #ifdef __i386__ #include "config.h" #include "wine/port.h" #include #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 #ifdef HAVE_SYS_SYSCTL_H # include #endif #include "windef.h" #include "wine/library.h" #include "ntdll_misc.h" #include "wine/exception.h" #include "wine/debug.h" #ifdef HAVE_VALGRIND_MEMCHECK_H #include #endif #undef ERR /* Solaris needs to define this */ /* not defined for x86, so copy the x86_64 definition */ typedef struct DECLSPEC_ALIGN(16) _M128A { ULONGLONG Low; LONGLONG High; } M128A; typedef struct { WORD ControlWord; WORD StatusWord; BYTE TagWord; BYTE Reserved1; WORD ErrorOpcode; DWORD ErrorOffset; WORD ErrorSelector; WORD Reserved2; DWORD DataOffset; WORD DataSelector; WORD Reserved3; DWORD MxCsr; DWORD MxCsr_Mask; M128A FloatRegisters[8]; M128A XmmRegisters[16]; BYTE Reserved4[96]; } XMM_SAVE_AREA32; /*********************************************************************** * signal context platform-specific definitions */ #ifdef linux typedef ucontext_t SIGCONTEXT; #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX]) #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX]) #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX]) #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX]) #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI]) #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI]) #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP]) #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP]) #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS]) #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS]) #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES]) #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS]) #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS]) #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS]) #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL]) #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP]) #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO]) #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR]) #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs)) #define FPUX_sig(context) (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL) #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */ #define VIF_FLAG 0x00080000 #define VIP_FLAG 0x00100000 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 #include typedef struct trapframe SIGCONTEXT; #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) #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)) #define FPU_sig(context) NULL /* FIXME */ #define FPUX_sig(context) NULL /* FIXME */ #endif /* bsdi */ #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) 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 TRAP_sig(context) ((context)->sc_trapno) #define ERROR_sig(context) ((context)->sc_err) #define EFL_sig(context) ((context)->sc_eflags) #define EIP_sig(context) ((context)->sc_eip) #define ESP_sig(context) ((context)->sc_esp) #define FPU_sig(context) NULL /* FIXME */ #define FPUX_sig(context) NULL /* FIXME */ #endif /* *BSD */ #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun) #ifdef _SCO_DS #include #endif #include typedef struct ucontext SIGCONTEXT; #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 ERR #define ERROR_sig(context) ((context)->uc_mcontext.gregs[ERR]) #endif #ifdef TRAPNO #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO]) #endif #define FPU_sig(context) NULL /* FIXME */ #define FPUX_sig(context) NULL /* FIXME */ #endif /* svr4 || SCO_DS */ #ifdef __APPLE__ # include typedef ucontext_t SIGCONTEXT; /* work around silly renaming of struct members in OS X 10.5 */ #if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32) #define EAX_sig(context) ((context)->uc_mcontext->__ss.__eax) #define EBX_sig(context) ((context)->uc_mcontext->__ss.__ebx) #define ECX_sig(context) ((context)->uc_mcontext->__ss.__ecx) #define EDX_sig(context) ((context)->uc_mcontext->__ss.__edx) #define ESI_sig(context) ((context)->uc_mcontext->__ss.__esi) #define EDI_sig(context) ((context)->uc_mcontext->__ss.__edi) #define EBP_sig(context) ((context)->uc_mcontext->__ss.__ebp) #define CS_sig(context) ((context)->uc_mcontext->__ss.__cs) #define DS_sig(context) ((context)->uc_mcontext->__ss.__ds) #define ES_sig(context) ((context)->uc_mcontext->__ss.__es) #define FS_sig(context) ((context)->uc_mcontext->__ss.__fs) #define GS_sig(context) ((context)->uc_mcontext->__ss.__gs) #define SS_sig(context) ((context)->uc_mcontext->__ss.__ss) #define EFL_sig(context) ((context)->uc_mcontext->__ss.__eflags) #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip)) #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp)) #define TRAP_sig(context) ((context)->uc_mcontext->__es.__trapno) #define ERROR_sig(context) ((context)->uc_mcontext->__es.__err) #define FPU_sig(context) NULL #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw) #else #define EAX_sig(context) ((context)->uc_mcontext->ss.eax) #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx) #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx) #define EDX_sig(context) ((context)->uc_mcontext->ss.edx) #define ESI_sig(context) ((context)->uc_mcontext->ss.esi) #define EDI_sig(context) ((context)->uc_mcontext->ss.edi) #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp) #define CS_sig(context) ((context)->uc_mcontext->ss.cs) #define DS_sig(context) ((context)->uc_mcontext->ss.ds) #define ES_sig(context) ((context)->uc_mcontext->ss.es) #define FS_sig(context) ((context)->uc_mcontext->ss.fs) #define GS_sig(context) ((context)->uc_mcontext->ss.gs) #define SS_sig(context) ((context)->uc_mcontext->ss.ss) #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags) #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip)) #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp)) #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno) #define ERROR_sig(context) ((context)->uc_mcontext->es.err) #define FPU_sig(context) NULL #define FPUX_sig(context) ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw) #endif #endif /* __APPLE__ */ 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]; static int fpux_support; /* whether the CPU support extended fpu context */ extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context ); enum i386_trap_code { TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */ #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */ TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */ TRAP_x86_NMI = T_NMI, /* NMI interrupt */ TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */ TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */ TRAP_x86_BOUND = T_BOUND, /* Bound range exception */ TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */ TRAP_x86_DNA = T_DNA, /* Device not available exception */ TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */ TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */ TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */ TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */ TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */ TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */ TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */ TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */ TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */ TRAP_x86_MCHK = T_MCHK, /* Machine check exception */ TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */ #else TRAP_x86_DIVIDE = 0, /* Division by zero exception */ TRAP_x86_TRCTRAP = 1, /* Single-step exception */ TRAP_x86_NMI = 2, /* NMI interrupt */ TRAP_x86_BPTFLT = 3, /* Breakpoint exception */ TRAP_x86_OFLOW = 4, /* Overflow exception */ TRAP_x86_BOUND = 5, /* Bound range exception */ TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */ TRAP_x86_DNA = 7, /* Device not available exception */ TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */ TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */ TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */ TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */ TRAP_x86_STKFLT = 12, /* Stack fault */ TRAP_x86_PROTFLT = 13, /* General protection fault */ TRAP_x86_PAGEFLT = 14, /* Page fault */ TRAP_x86_ARITHTRAP = 16, /* Floating point exception */ TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */ TRAP_x86_MCHK = 18, /* Machine check exception */ TRAP_x86_CACHEFLT = 19 /* SIMD exception (via SIGFPE) if CPU is SSE capable otherwise Cache flush exception (via SIGSEV) */ #endif }; /*********************************************************************** * dispatch_signal */ static inline 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 enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext ) { #ifdef TRAP_sig return TRAP_sig(sigcontext); #else return TRAP_x86_UNKNOWN; /* unknown trap code */ #endif } /*********************************************************************** * get_error_code * * Get the error code for a signal. */ static inline WORD 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->ContextFlags = CONTEXT_FULL; 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 && get_vm86_teb_info()->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_FLAG) { 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_FLAG; get_vm86_teb_info()->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 |= get_vm86_teb_info()->vm86_pending; } #endif /* __HAVE_VM86 */ #ifdef __sun /* We have to workaround two Solaris breakages: * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit * code crash badly. * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers * are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs. */ extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old ); __ASM_GLOBAL_FUNC( sigaction_syscall, "movl $0x62,%eax\n\t" "int $0x91\n\t" "ret" ) /* assume the same libc handler is used for all signals */ static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context ); static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext ) { struct ntdll_thread_data *thread_data; __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es"); thread_data = get_current_teb()->SystemReserved2; wine_set_fs( thread_data->fs ); wine_set_gs( thread_data->gs ); libc_sigacthandler( signal, siginfo, sigcontext ); } static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old ) { struct sigaction real_act; if (sigaction( sig, new, old ) == -1) return -1; /* retrieve the real handler and flags with a direct syscall */ sigaction_syscall( sig, NULL, &real_act ); libc_sigacthandler = real_act.sa_sigaction; real_act.sa_sigaction = wine_sigacthandler; sigaction_syscall( sig, &real_act, NULL ); return 0; } #define sigaction(sig,new,old) solaris_sigaction(sig,new,old) #endif typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context ); /*********************************************************************** * init_handler * * Handler initialization when the full context is not needed. * Return the stack pointer to use for pushing the exception data. */ static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs ) { TEB *teb = get_current_teb(); struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2; /* 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 #ifndef __sun /* see above for Solaris handling */ wine_set_fs( thread_data->fs ); wine_set_gs( thread_data->gs ); #endif 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. */ return teb->WOW32Reserved; } return (void *)(ESP_sig(sigcontext) & ~3); } /*********************************************************************** * save_fpu * * Save the thread FPU context. */ static inline void save_fpu( CONTEXT *context ) { #ifdef __GNUC__ context->ContextFlags |= CONTEXT_FLOATING_POINT; __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) ); #endif } /*********************************************************************** * save_fpux * * Save the thread FPU extended context. */ static inline void save_fpux( CONTEXT *context ) { #ifdef __GNUC__ /* we have to enforce alignment by hand */ char buffer[sizeof(XMM_SAVE_AREA32) + 16]; XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15); __asm__ __volatile__( "fxsave %0" : "=m" (*state) ); context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS; memcpy( context->ExtendedRegisters, state, sizeof(*state) ); #endif } /*********************************************************************** * restore_fpu * * Restore the FPU context to a sigcontext. */ static inline void restore_fpu( const CONTEXT *context ) { FLOATING_SAVE_AREA float_status = context->FloatSave; /* reset the current interrupt status */ float_status.StatusWord &= float_status.ControlWord | 0xffffff80; #ifdef __GNUC__ __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) ); #endif /* __GNUC__ */ } /*********************************************************************** * restore_fpux * * Restore the FPU extended context to a sigcontext. */ static inline void restore_fpux( const CONTEXT *context ) { #ifdef __GNUC__ /* we have to enforce alignment by hand */ char buffer[sizeof(XMM_SAVE_AREA32) + 16]; XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15); memcpy( state, context->ExtendedRegisters, sizeof(*state) ); /* reset the current interrupt status */ state->StatusWord &= state->ControlWord | 0xff80; __asm__ __volatile__( "fxrstor %0" : : "m" (*state) ); #endif } /*********************************************************************** * fpux_to_fpu * * Build a standard FPU context from an extended one. */ static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux ) { unsigned int i, tag, stack_top; fpu->ControlWord = fpux->ControlWord | 0xffff0000; fpu->StatusWord = fpux->StatusWord | 0xffff0000; fpu->ErrorOffset = fpux->ErrorOffset; fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16); fpu->DataOffset = fpux->DataOffset; fpu->DataSelector = fpux->DataSelector; fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000; stack_top = (fpux->StatusWord >> 11) & 7; fpu->TagWord = 0xffff0000; for (i = 0; i < 8; i++) { memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 ); if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */ else { const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7]; if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */ { tag = 2; /* special */ } else if (!(reg->High & 0x7fff)) /* exponent all zeroes */ { if (reg->Low) tag = 2; /* special */ else tag = 1; /* zero */ } else { if (reg->Low >> 63) tag = 0; /* valid */ else tag = 2; /* special */ } } fpu->TagWord |= tag << (2 * i); } } /*********************************************************************** * save_context * * Build a context structure from the signal info. */ static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs ) { struct ntdll_thread_regs * const regs = ntdll_get_thread_regs(); FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext); XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext); memset(context, 0, sizeof(*context)); context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS; context->Eax = EAX_sig(sigcontext); context->Ebx = EBX_sig(sigcontext); context->Ecx = ECX_sig(sigcontext); context->Edx = EDX_sig(sigcontext); context->Esi = ESI_sig(sigcontext); context->Edi = EDI_sig(sigcontext); context->Ebp = EBP_sig(sigcontext); context->EFlags = EFL_sig(sigcontext); context->Eip = EIP_sig(sigcontext); context->Esp = ESP_sig(sigcontext); context->SegCs = LOWORD(CS_sig(sigcontext)); context->SegDs = LOWORD(DS_sig(sigcontext)); context->SegEs = LOWORD(ES_sig(sigcontext)); context->SegFs = fs; context->SegGs = gs; context->SegSs = LOWORD(SS_sig(sigcontext)); context->Dr0 = regs->dr0; context->Dr1 = regs->dr1; context->Dr2 = regs->dr2; context->Dr3 = regs->dr3; context->Dr6 = regs->dr6; context->Dr7 = regs->dr7; if (fpu) { context->ContextFlags |= CONTEXT_FLOATING_POINT; context->FloatSave = *fpu; } if (fpux) { context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS; memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) ); fpux_support = 1; if (!fpu) fpux_to_fpu( &context->FloatSave, fpux ); } if (!fpu && !fpux) save_fpu( context ); } /*********************************************************************** * restore_context * * Restore the signal info from the context. */ static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext ) { struct ntdll_thread_regs * const regs = ntdll_get_thread_regs(); FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext); XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext); regs->dr0 = context->Dr0; regs->dr1 = context->Dr1; regs->dr2 = context->Dr2; regs->dr3 = context->Dr3; regs->dr6 = context->Dr6; regs->dr7 = context->Dr7; EAX_sig(sigcontext) = context->Eax; EBX_sig(sigcontext) = context->Ebx; ECX_sig(sigcontext) = context->Ecx; EDX_sig(sigcontext) = context->Edx; ESI_sig(sigcontext) = context->Esi; EDI_sig(sigcontext) = context->Edi; EBP_sig(sigcontext) = context->Ebp; EFL_sig(sigcontext) = context->EFlags; EIP_sig(sigcontext) = context->Eip; ESP_sig(sigcontext) = context->Esp; CS_sig(sigcontext) = context->SegCs; DS_sig(sigcontext) = context->SegDs; ES_sig(sigcontext) = context->SegEs; SS_sig(sigcontext) = context->SegSs; #ifdef GS_sig GS_sig(sigcontext) = context->SegGs; #else wine_set_gs( context->SegGs ); #endif #ifdef FS_sig FS_sig(sigcontext) = context->SegFs; #else wine_set_fs( context->SegFs ); #endif if (fpu) *fpu = context->FloatSave; if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) ); if (!fpu && !fpux) restore_fpu( context ); } /*********************************************************************** * get_cpu_context * * Register function to get the context of the current thread. */ void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs ) { *context = *regs; if (fpux_support) save_fpux( context ); else save_fpu( context ); } DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 ) /*********************************************************************** * set_cpu_context * * Set the new CPU context. Used by NtSetContextThread. */ void set_cpu_context( const CONTEXT *context ) { DWORD flags = context->ContextFlags & ~CONTEXT_i386; if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context ); else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context ); if (flags & CONTEXT_DEBUG_REGISTERS) { struct ntdll_thread_regs * const regs = ntdll_get_thread_regs(); regs->dr0 = context->Dr0; regs->dr1 = context->Dr1; regs->dr2 = context->Dr2; regs->dr3 = context->Dr3; regs->dr6 = context->Dr6; regs->dr7 = context->Dr7; } if (flags & CONTEXT_FULL) { if (!(flags & CONTEXT_CONTROL)) FIXME( "setting partial context (%x) not supported\n", flags ); else if (flags & CONTEXT_SEGMENTS) __wine_call_from_32_restore_regs( context ); else { CONTEXT newcontext = *context; newcontext.SegDs = wine_get_ds(); newcontext.SegEs = wine_get_es(); newcontext.SegFs = wine_get_fs(); newcontext.SegGs = wine_get_gs(); __wine_call_from_32_restore_regs( &newcontext ); } } } /*********************************************************************** * is_privileged_instr * * Check if the fault location is a privileged instruction. * Based on the instruction emulation code in dlls/kernel/instr.c. */ static inline DWORD is_privileged_instr( CONTEXT86 *context ) { const BYTE *instr; unsigned int prefix_count = 0; if (!wine_ldt_is_system( context->SegCs )) return 0; instr = (BYTE *)context->Eip; for (;;) switch(*instr) { /* instruction prefixes */ case 0x2e: /* %cs: */ case 0x36: /* %ss: */ case 0x3e: /* %ds: */ case 0x26: /* %es: */ case 0x64: /* %fs: */ case 0x65: /* %gs: */ case 0x66: /* opcode size */ case 0x67: /* addr size */ case 0xf0: /* lock */ case 0xf2: /* repne */ case 0xf3: /* repe */ if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION; instr++; continue; case 0x0f: /* extended instruction */ switch(instr[1]) { case 0x20: /* mov crX, reg */ case 0x21: /* mov drX, reg */ case 0x22: /* mov reg, crX */ case 0x23: /* mov reg drX */ return EXCEPTION_PRIV_INSTRUCTION; } return 0; case 0x6c: /* insb (%dx) */ case 0x6d: /* insl (%dx) */ case 0x6e: /* outsb (%dx) */ case 0x6f: /* outsl (%dx) */ case 0xcd: /* int $xx */ case 0xe4: /* inb al,XX */ case 0xe5: /* in (e)ax,XX */ case 0xe6: /* outb XX,al */ case 0xe7: /* out XX,(e)ax */ case 0xec: /* inb (%dx),%al */ case 0xed: /* inl (%dx),%eax */ case 0xee: /* outb %al,(%dx) */ case 0xef: /* outl %eax,(%dx) */ case 0xf4: /* hlt */ case 0xfa: /* cli */ case 0xfb: /* sti */ return EXCEPTION_PRIV_INSTRUCTION; default: return 0; } } #include "pshpack1.h" struct atl_thunk { DWORD movl; /* movl this,4(%esp) */ DWORD this; BYTE jmp; /* jmp func */ int func; }; #include "poppack.h" /********************************************************************** * check_atl_thunk * * Check if code destination is an ATL thunk, and emulate it if so. */ static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context ) { const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1]; BOOL ret = FALSE; __TRY { if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9) { *((DWORD *)context->Esp + 1) = thunk->this; context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func; TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n", thunk, context->Eip, *((DWORD *)context->Esp + 1) ); ret = TRUE; } } __EXCEPT_PAGE_FAULT { return FALSE; } __ENDTRY return ret; } /*********************************************************************** * setup_exception_record * * Setup the exception record and context on the thread stack. */ static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr, WORD fs, WORD gs, 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 */ CONTEXT context; EXCEPTION_RECORD rec; DWORD ebp; DWORD eip; } *stack = stack_ptr; DWORD exception_code = 0; /* stack sanity checks */ if ((char *)stack >= (char *)get_signal_stack() && (char *)stack < (char *)get_signal_stack() + signal_stack_size) { WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n", GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext), (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } if (stack - 1 > stack || /* check for overflow in subtraction */ (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack || (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase) { WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n", GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext), (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); } else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096) { /* stack overflow on last page, unrecoverable */ UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1); WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n", diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext), (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack, NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit) { /* stack access below stack limit, may be recoverable */ if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW; else { UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1); WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n", diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext), (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack, NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } } stack--; /* push the stack_layout structure */ #if defined(VALGRIND_MAKE_MEM_UNDEFINED) VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack)); #elif defined(VALGRIND_MAKE_WRITABLE) VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack)); #endif stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */ stack->rec_ptr = &stack->rec; stack->context_ptr = &stack->context; stack->rec.ExceptionRecord = NULL; stack->rec.ExceptionCode = exception_code; stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE; stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext); stack->rec.NumberParameters = 0; save_context( &stack->context, sigcontext, fs, gs ); /* now modify the sigcontext to return to the raise function */ ESP_sig(sigcontext) = (DWORD)stack; EIP_sig(sigcontext) = (DWORD)func; /* clear single-step, direction, and align check flag */ EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000); 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; } /*********************************************************************** * 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 ) { WORD fs, gs; void *stack = init_handler( sigcontext, &fs, &gs ); return setup_exception_record( sigcontext, stack, fs, gs, func ); } /*********************************************************************** * 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 & ~(context->FloatSave.ControlWord & 0x3f); 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->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context )) goto done; if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1], rec->ExceptionInformation[0] ))) goto done; } break; case EXCEPTION_DATATYPE_MISALIGNMENT: /* FIXME: pass through exception handler first? */ if (context->EFlags & 0x00040000) { /* Disable AC flag, return */ context->EFlags &= ~0x00040000; goto done; } break; } __regs_RtlRaiseException( rec, context ); done: NtSetContextThread( GetCurrentThread(), context ); } /********************************************************************** * raise_trap_exception */ static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP) { struct ntdll_thread_regs * const regs = ntdll_get_thread_regs(); /* when single stepping can't tell whether this is a hw bp or a * single step interrupt. try to avoid as much overhead as possible * and only do a server call if there is any hw bp enabled. */ if( !(context->EFlags & 0x100) || (regs->dr7 & 0xff) ) { /* (possible) hardware breakpoint, fetch the debug registers */ context->ContextFlags = CONTEXT_DEBUG_REGISTERS; NtGetContextThread(GetCurrentThread(), context); context->ContextFlags |= CONTEXT_FULL; /* restore flags */ } context->EFlags &= ~0x100; /* clear single-step flag */ } __regs_RtlRaiseException( rec, context ); NtSetContextThread( GetCurrentThread(), context ); } /********************************************************************** * raise_exception * * Generic raise function for exceptions that don't need special treatment. */ static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context ) { __regs_RtlRaiseException( rec, context ); NtSetContextThread( GetCurrentThread(), 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 */ get_vm86_teb_info()->vm86_pending |= VIP_FLAG; 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 */ goto done; } merge_vm86_pending_flags( rec ); } else if (get_vm86_teb_info()->dpmi_vif && !wine_ldt_is_system(context->SegCs) && !wine_ldt_is_system(context->SegSs)) { /* Executing DPMI code and virtual interrupts are enabled. */ get_vm86_teb_info()->vm86_pending = 0; __regs_RtlRaiseException( rec, context ); } done: NtSetContextThread( GetCurrentThread(), context ); } /********************************************************************** * usr2_handler * * Handler for SIGUSR2. * We use it to signal that the running __wine_enter_vm86() should * immediately set VIP_FLAG, causing pending events to be handled * as early as possible. */ static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception ); rec->ExceptionCode = EXCEPTION_VM86_STI; } #endif /* __HAVE_VM86 */ /********************************************************************** * segv_handler * * Handler for SIGSEGV and related errors. */ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { WORD fs, gs; EXCEPTION_RECORD *rec; SIGCONTEXT *context = sigcontext; void *stack = init_handler( sigcontext, &fs, &gs ); /* check for page fault inside the thread stack */ if (get_trap_code(context) == TRAP_x86_PAGEFLT && (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack && (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase && virtual_handle_stack_fault( siginfo->si_addr )) { /* check if this was the last guard page */ if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096) { rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception ); rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW; } return; } rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception ); if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return; switch(get_trap_code(context)) { case TRAP_x86_OFLOW: /* Overflow exception */ rec->ExceptionCode = EXCEPTION_INT_OVERFLOW; break; case TRAP_x86_BOUND: /* Bound range exception */ rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED; break; case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */ rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; break; case TRAP_x86_STKFLT: /* Stack fault */ rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW; break; case TRAP_x86_SEGNPFLT: /* Segment not present exception */ case TRAP_x86_PROTFLT: /* General protection fault */ case TRAP_x86_UNKNOWN: /* Unknown fault code */ { WORD err = get_error_code(context); if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break; rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION; rec->NumberParameters = 2; rec->ExceptionInformation[0] = 0; /* if error contains a LDT selector, use that as fault address */ if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 )) rec->ExceptionInformation[1] = err & ~7; else rec->ExceptionInformation[1] = 0xffffffff; } break; case TRAP_x86_PAGEFLT: /* Page fault */ rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION; rec->NumberParameters = 2; rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09; rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr; break; case TRAP_x86_ALIGNFLT: /* Alignment check exception */ rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT; break; default: WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) ); /* fall through */ case TRAP_x86_NMI: /* NMI interrupt */ case TRAP_x86_DNA: /* Device not available exception */ case TRAP_x86_DOUBLEFLT: /* Double fault exception */ case TRAP_x86_TSSFLT: /* Invalid TSS exception */ case TRAP_x86_MCHK: /* Machine check exception */ case TRAP_x86_CACHEFLT: /* Cache flush exception */ rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; break; } } /********************************************************************** * trap_handler * * Handler for SIGTRAP. */ static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { SIGCONTEXT *context = sigcontext; EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception ); switch(get_trap_code(context)) { case TRAP_x86_TRCTRAP: /* Single-step exception */ rec->ExceptionCode = EXCEPTION_SINGLE_STEP; break; case TRAP_x86_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 void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { CONTEXT *win_context; SIGCONTEXT *context = sigcontext; EXCEPTION_RECORD *rec = setup_exception( context, raise_exception ); win_context = get_exception_context( rec ); switch(get_trap_code(context)) { case TRAP_x86_DIVIDE: /* Division by zero exception */ rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO; break; case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */ rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION; break; case TRAP_x86_ARITHTRAP: /* Floating point exception */ case TRAP_x86_UNKNOWN: /* Unknown fault code */ rec->ExceptionCode = get_fpu_code( win_context ); rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset; break; case TRAP_x86_CACHEFLT: /* SIMD exception */ /* TODO: * Behaviour only tested for divide-by-zero exceptions * Check for other SIMD exceptions as well */ if(siginfo->si_code != FPE_FLTDIV) FIXME("untested SIMD exception: %#x. Might not work correctly\n", siginfo->si_code); rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS; rec->NumberParameters = 1; /* no idea what meaning is actually behind this but that's what native does */ rec->ExceptionInformation[0] = 0; break; default: WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) ); rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION; break; } } /********************************************************************** * int_handler * * Handler for SIGINT. * * FIXME: should not be calling external functions on the signal stack. */ static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { WORD fs, gs; init_handler( sigcontext, &fs, &gs ); if (!dispatch_signal(SIGINT)) { EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception ); rec->ExceptionCode = CONTROL_C_EXIT; } } /********************************************************************** * abrt_handler * * Handler for SIGABRT. */ static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception ); rec->ExceptionCode = EXCEPTION_WINE_ASSERTION; rec->ExceptionFlags = EH_NONCONTINUABLE; } /********************************************************************** * quit_handler * * Handler for SIGQUIT. */ static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { WORD fs, gs; init_handler( sigcontext, &fs, &gs ); server_abort_thread(0); } /********************************************************************** * usr1_handler * * Handler for SIGUSR1, used to signal a thread that it got suspended. */ static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext ) { CONTEXT context; WORD fs, gs; init_handler( sigcontext, &fs, &gs ); save_context( &context, sigcontext, fs, gs ); wait_suspend( &context ); restore_context( &context, sigcontext ); } /********************************************************************** * 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 = 8192, min_size = teb_size + max( MINSIGSTKSZ, 8192 ); /* 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; } /*********************************************************************** * __wine_set_signal_handler (NTDLL.@) */ int CDECL __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_thread */ void signal_init_thread(void) { #ifdef HAVE_SIGALTSTACK stack_t ss; #ifdef __APPLE__ int mib[2], val = 1; mib[0] = CTL_KERN; mib[1] = KERN_THALTSTACK; sysctl( mib, 2, NULL, NULL, &val, sizeof(val) ); #endif ss.ss_sp = get_signal_stack(); ss.ss_size = signal_stack_size; ss.ss_flags = 0; if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" ); #endif /* HAVE_SIGALTSTACK */ ntdll_get_thread_data()->gs = wine_get_gs(); } /********************************************************************** * signal_init_process */ void signal_init_process(void) { struct sigaction sig_act; sig_act.sa_mask = server_block_set; sig_act.sa_flags = SA_SIGINFO | SA_RESTART; #ifdef SA_ONSTACK sig_act.sa_flags |= SA_ONSTACK; #endif sig_act.sa_sigaction = int_handler; if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error; sig_act.sa_sigaction = fpe_handler; if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error; sig_act.sa_sigaction = abrt_handler; if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error; sig_act.sa_sigaction = quit_handler; if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error; sig_act.sa_sigaction = usr1_handler; if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error; sig_act.sa_sigaction = segv_handler; if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error; if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error; #ifdef SIGBUS if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error; #endif #ifdef SIGTRAP sig_act.sa_sigaction = trap_handler; if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error; #endif #ifdef __HAVE_VM86 sig_act.sa_sigaction = usr2_handler; if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error; #endif signal_init_thread(); return; error: perror("sigaction"); exit(1); } #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; break; case VM86_TRAP: /* return due to DOS-debugger request */ switch(VM86_ARG(res)) { case TRAP_x86_TRCTRAP: /* Single-step exception */ rec.ExceptionCode = EXCEPTION_SINGLE_STEP; break; case TRAP_x86_BPTFLT: /* Breakpoint exception */ rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */ /* fall through */ default: rec.ExceptionCode = EXCEPTION_BREAKPOINT; break; } break; 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_FLAG; context->EFlags &= ~VIP_FLAG; get_vm86_teb_info()->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: WINE_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") /********************************************************************** * EXC_CallHandler (internal) * * Some exception handlers depend on EBP to have a fixed position relative to * the exception frame. * Shrinker depends on (*1) doing what it does, * (*2) being the exact instruction it is and (*3) beginning with 0x64 * (i.e. the %fs prefix to the movl instruction). It also depends on the * function calling the handler having only 5 parameters (*4). */ __ASM_GLOBAL_FUNC( EXC_CallHandler, " pushl %ebp\n" " movl %esp, %ebp\n" " pushl %ebx\n" " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */ " pushl 24(%ebp)\n" " pushl 20(%ebp)\n" " pushl 16(%ebp)\n" " pushl 12(%ebp)\n" " pushl 8(%ebp)\n" " call " __ASM_NAME("call_exception_handler") "\n" " popl %ebx\n" " leave\n" " ret\n" ) __ASM_GLOBAL_FUNC(call_exception_handler, " pushl %ebp\n" " movl %esp, %ebp\n" " subl $12,%esp\n" " pushl 12(%ebp)\n" /* make any exceptions in this... */ " pushl %edx\n" /* handler be handled by... */ " .byte 0x64\n" " pushl (0)\n" /* nested_handler (passed in edx). */ " .byte 0x64\n" " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */ " pushl 20(%ebp)\n" " pushl 16(%ebp)\n" " pushl 12(%ebp)\n" " pushl 8(%ebp)\n" " movl 24(%ebp), %ecx\n" /* (*1) */ " call *%ecx\n" /* call handler. (*2) */ " .byte 0x64\n" " movl (0), %esp\n" /* restore previous... (*3) */ " .byte 0x64\n" " popl (0)\n" /* exception frame. */ " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */ " popl %ebp\n" " ret $20\n" /* (*4) */ ) #endif /* __i386__ */