/* * 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 #include "windef.h" #include "thread.h" #include "wine/library.h" #include "ntdll_misc.h" #ifdef HAVE_VALGRIND_MEMCHECK_H #include #endif /*********************************************************************** * 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 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 #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)) #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) #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; #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 #endif /* svr4 || SCO_DS */ #ifdef __APPLE__ # include typedef ucontext_t SIGCONTEXT; #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) #endif /* __APPLE__ */ #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( 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 /* Cache flush exception */ #endif }; /*********************************************************************** * 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 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 && 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. */ inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs ) { void *stack = (void *)ESP_sig(sigcontext); TEB *teb = get_current_teb(); struct ntdll_thread_regs *thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1; /* 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 wine_set_fs( thread_regs->fs ); /* 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( thread_regs->gs ); 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 * * Save the thread FPU context. */ inline static void save_fpu( CONTEXT *context ) { #ifdef __GNUC__ context->ContextFlags |= CONTEXT_FLOATING_POINT; __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) ); #endif } /*********************************************************************** * restore_fpu * * Restore the FPU context to a sigcontext. */ inline static 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__ */ } /*********************************************************************** * save_context * * Build a context structure from the signal info. */ inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs ) { struct ntdll_thread_regs * const regs = ntdll_get_thread_regs(); 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; #ifdef FPU_sig if (FPU_sig(sigcontext)) { context->ContextFlags |= CONTEXT_FLOATING_POINT; context->FloatSave = *FPU_sig(sigcontext); } else #endif { save_fpu( context ); } } /*********************************************************************** * restore_context * * Restore the signal info from the context. */ inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext ) { 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; 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 #ifdef FPU_sig if (FPU_sig(sigcontext)) { *FPU_sig(sigcontext) = context->FloatSave; } else #endif { 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; 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_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_FULL) != (CONTEXT_FULL & ~CONTEXT_i386)) FIXME( "setting partial context (%lx) not supported\n", flags ); else __wine_call_from_32_restore_regs( context ); } } /*********************************************************************** * 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 int 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 0; 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 1; } 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 1; 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 ) { struct atl_thunk *thunk = (struct atl_thunk *)rec->ExceptionInformation[1]; if (thunk->movl != 0x042444c7 || thunk->jmp != 0xe9) return FALSE; *((DWORD *)context->Esp + 1) = thunk->this; context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func; TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n", thunk, context->Eip, *((DWORD *)context->Esp + 1) ); return TRUE; } /*********************************************************************** * 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 */ CONTEXT context; EXCEPTION_RECORD rec; DWORD ebp; DWORD eip; } *stack; WORD fs, gs; stack = init_handler( sigcontext, &fs, &gs ); /* 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 %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 - 1) < (char *)NtCurrentTeb()->Tib.StackLimit || (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase) { UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)stack; if (diff < 4096) { ERR( "stack overflow %u bytes in thread %04lx eip %08x esp %08x stack %p-%p\n", diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext), (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase ); server_abort_thread(1); } else WARN( "exception outside of stack limits in thread %04lx 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 ); } stack--; /* push the stack_layout structure */ #ifdef HAVE_VALGRIND_MEMCHECK_H 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.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; EFL_sig(sigcontext) &= ~0x100; /* clear single-step flag */ 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->ExceptionInformation[0] == 8) && check_atl_thunk( rec, context )) goto done; rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] ); } 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) { 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; context->ContextFlags |= CONTEXT_FULL; /* restore flags */ } } __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 */ 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 */ goto done; } 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 ); } done: NtSetContextThread( GetCurrentThread(), 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 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 ) { SIGCONTEXT *context = sigcontext; EXCEPTION_RECORD *rec = setup_exception( context, raise_segv_exception ); 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 */ if (!get_error_code(context) && is_privileged_instr( get_exception_context(rec) )) rec->ExceptionCode = EXCEPTION_PRIV_INSTRUCTION; else { WORD err = get_error_code(context); rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION; rec->NumberParameters = 2; rec->ExceptionInformation[0] = 0; /* if error contains a LDT selector, use that as fault address */ rec->ExceptionInformation[1] = (err & 7) == 4 ? (err & ~7) : 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: 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 ); break; default: 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; } /********************************************************************** * term_handler * * Handler for SIGTERM. */ static void term_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 = 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; } /*********************************************************************** * __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) { struct sigaction sig_act; #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) == -1) { perror( "sigaltstack" ); return FALSE; } #endif /* HAVE_SIGALTSTACK */ sigemptyset( &sig_act.sa_mask ); sigaddset( &sig_act.sa_mask, SIGINT ); sigaddset( &sig_act.sa_mask, SIGUSR1 ); sigaddset( &sig_act.sa_mask, SIGUSR2 ); 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 = term_handler; if (sigaction( SIGTERM, &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 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 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_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"); /********************************************************************** * 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" " subl $4,%esp\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" " 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__ */