/* * 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 #include #include #include #include #include #include "ntstatus.h" #define WIN32_NO_STATUS #include "windef.h" #include "ntdll_misc.h" #include "wine/exception.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(seh); /* 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; struct x86_thread_data { DWORD fs; /* 1d4 TEB selector */ DWORD gs; /* 1d8 libc selector; update winebuild if you move this! */ DWORD dr0; /* 1dc debug registers */ DWORD dr1; /* 1e0 */ DWORD dr2; /* 1e4 */ DWORD dr3; /* 1e8 */ DWORD dr6; /* 1ec */ DWORD dr7; /* 1f0 */ void *exit_frame; /* 1f4 exit frame pointer */ /* the ntdll_thread_data structure follows here */ }; C_ASSERT( offsetof( TEB, SystemReserved2 ) + offsetof( struct x86_thread_data, gs ) == 0x1d8 ); C_ASSERT( offsetof( TEB, SystemReserved2 ) + offsetof( struct x86_thread_data, exit_frame ) == 0x1f4 ); static inline struct x86_thread_data *x86_thread_data(void) { return (struct x86_thread_data *)NtCurrentTeb()->SystemReserved2; } struct ldt_copy *__wine_ldt_copy = NULL; /* Exception record for handling exceptions happening inside exception handlers */ typedef struct { EXCEPTION_REGISTRATION_RECORD frame; EXCEPTION_REGISTRATION_RECORD *prevFrame; } EXC_NESTED_FRAME; extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher, PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler ); /******************************************************************* * is_valid_frame */ static inline BOOL is_valid_frame( void *frame ) { if ((ULONG_PTR)frame & 3) return FALSE; return (frame >= NtCurrentTeb()->Tib.StackLimit && (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1); } /******************************************************************* * raise_handler * * Handler for exceptions happening inside a handler. */ static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) { if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) return ExceptionContinueSearch; /* We shouldn't get here so we store faulty frame in dispatcher */ *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame; return ExceptionNestedException; } /******************************************************************* * unwind_handler * * Handler for exceptions happening inside an unwind handler. */ static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) { if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))) return ExceptionContinueSearch; /* We shouldn't get here so we store faulty frame in dispatcher */ *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame; return ExceptionCollidedUnwind; } /********************************************************************** * call_stack_handlers * * Call the stack handlers chain. */ static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context ) { EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame; DWORD res; frame = NtCurrentTeb()->Tib.ExceptionList; nested_frame = NULL; while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) { /* Check frame address */ if (!is_valid_frame( frame )) { rec->ExceptionFlags |= EH_STACK_INVALID; break; } /* Call handler */ TRACE( "calling handler at %p code=%x flags=%x\n", frame->Handler, rec->ExceptionCode, rec->ExceptionFlags ); res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler ); TRACE( "handler at %p returned %x\n", frame->Handler, res ); if (frame == nested_frame) { /* no longer nested */ nested_frame = NULL; rec->ExceptionFlags &= ~EH_NESTED_CALL; } switch(res) { case ExceptionContinueExecution: if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS; return STATUS_NONCONTINUABLE_EXCEPTION; case ExceptionContinueSearch: break; case ExceptionNestedException: if (nested_frame < dispatch) nested_frame = dispatch; rec->ExceptionFlags |= EH_NESTED_CALL; break; default: return STATUS_INVALID_DISPOSITION; } frame = frame->Prev; } return STATUS_UNHANDLED_EXCEPTION; } /******************************************************************* * KiUserExceptionDispatcher (NTDLL.@) */ NTSTATUS WINAPI KiUserExceptionDispatcher( EXCEPTION_RECORD *rec, CONTEXT *context ) { NTSTATUS status; DWORD c; TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress, context->Eip, GetCurrentThreadId() ); for (c = 0; c < rec->NumberParameters; c++) TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] ); if (rec->ExceptionCode == EXCEPTION_WINE_STUB) { if (rec->ExceptionInformation[1] >> 16) MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n", rec->ExceptionAddress, (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] ); else MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n", rec->ExceptionAddress, (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] ); } else { TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n", context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi ); TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n", context->Ebp, context->Esp, context->SegCs, context->SegDs, context->SegEs, context->SegFs, context->SegGs, context->EFlags ); } /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */ if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--; if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) NtContinue( context, FALSE ); if ((status = call_stack_handlers( rec, context )) == STATUS_SUCCESS) NtContinue( context, FALSE ); if (status != STATUS_UNHANDLED_EXCEPTION) RtlRaiseStatus( status ); return NtRaiseException( rec, context, FALSE ); } /*********************************************************************** * save_fpu * * Save the thread FPU context. */ static inline void save_fpu( CONTEXT *context ) { #ifdef __GNUC__ struct { DWORD ControlWord; DWORD StatusWord; DWORD TagWord; DWORD ErrorOffset; DWORD ErrorSelector; DWORD DataOffset; DWORD DataSelector; } float_status; context->ContextFlags |= CONTEXT_FLOATING_POINT; __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) ); /* Reset unmasked exceptions status to avoid firing an exception. */ memcpy(&float_status, &context->FloatSave, sizeof(float_status)); float_status.StatusWord &= float_status.ControlWord | 0xffffff80; __asm__ __volatile__( "fldenv %0" : : "m" (float_status) ); #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); context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS; __asm__ __volatile__( "fxsave %0" : "=m" (*state) ); memcpy( context->ExtendedRegisters, state, sizeof(*state) ); #endif } /*********************************************************************** * RtlCaptureContext (NTDLL.@) */ __ASM_STDCALL_FUNC( RtlCaptureContext, 4, "pushl %eax\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "movl 8(%esp),%eax\n\t" /* context */ "movl $0x10007,(%eax)\n\t" /* context->ContextFlags */ "movw %gs,0x8c(%eax)\n\t" /* context->SegGs */ "movw %fs,0x90(%eax)\n\t" /* context->SegFs */ "movw %es,0x94(%eax)\n\t" /* context->SegEs */ "movw %ds,0x98(%eax)\n\t" /* context->SegDs */ "movl %edi,0x9c(%eax)\n\t" /* context->Edi */ "movl %esi,0xa0(%eax)\n\t" /* context->Esi */ "movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */ "movl %edx,0xa8(%eax)\n\t" /* context->Edx */ "movl %ecx,0xac(%eax)\n\t" /* context->Ecx */ "movl 0(%ebp),%edx\n\t" "movl %edx,0xb4(%eax)\n\t" /* context->Ebp */ "movl 4(%ebp),%edx\n\t" "movl %edx,0xb8(%eax)\n\t" /* context->Eip */ "movw %cs,0xbc(%eax)\n\t" /* context->SegCs */ "pushfl\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "popl 0xc0(%eax)\n\t" /* context->EFlags */ __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t") "leal 8(%ebp),%edx\n\t" "movl %edx,0xc4(%eax)\n\t" /* context->Esp */ "movw %ss,0xc8(%eax)\n\t" /* context->SegSs */ "popl 0xb0(%eax)\n\t" /* context->Eax */ __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t") "ret $4" ) /*********************************************************************** * NtGetContextThread (NTDLL.@) * ZwGetContextThread (NTDLL.@) * * Note: we use a small assembly wrapper to save the necessary registers * in case we are fetching the context of the current thread. */ NTSTATUS CDECL DECLSPEC_HIDDEN __regs_NtGetContextThread( DWORD edi, DWORD esi, DWORD ebx, DWORD eflags, DWORD ebp, DWORD retaddr, HANDLE handle, CONTEXT *context ) { DWORD needed_flags = context->ContextFlags & ~CONTEXT_i386; /* preset the registers that we got from the asm wrapper */ if (needed_flags & CONTEXT_INTEGER) { context->Ebx = ebx; context->Esi = esi; context->Edi = edi; } if (needed_flags & CONTEXT_CONTROL) { context->Ebp = ebp; context->Esp = (DWORD)&retaddr; context->Eip = (DWORD)NtGetContextThread + 12; context->EFlags = eflags; } return unix_funcs->NtGetContextThread( handle, context ); } __ASM_STDCALL_FUNC( NtGetContextThread, 8, "pushl %ebp\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_rel_offset %ebp,0\n\t") "movl %esp,%ebp\n\t" __ASM_CFI(".cfi_def_cfa_register %ebp\n\t") "pushfl\n\t" "pushl %ebx\n\t" __ASM_CFI(".cfi_rel_offset %ebx,-8\n\t") "pushl %esi\n\t" __ASM_CFI(".cfi_rel_offset %esi,-12\n\t") "pushl %edi\n\t" __ASM_CFI(".cfi_rel_offset %edi,-16\n\t") "call " __ASM_NAME("__regs_NtGetContextThread") "\n\t" "leave\n\t" __ASM_CFI(".cfi_def_cfa %esp,4\n\t") __ASM_CFI(".cfi_same_value %ebp\n\t") "ret $8" ) /******************************************************************* * RtlUnwind (NTDLL.@) */ void WINAPI DECLSPEC_HIDDEN __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp, PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context ) { EXCEPTION_RECORD record; EXCEPTION_REGISTRATION_RECORD *frame, *dispatch; DWORD res; context->Eax = (DWORD)retval; /* build an exception record, if we do not have one */ if (!pRecord) { record.ExceptionCode = STATUS_UNWIND; record.ExceptionFlags = 0; record.ExceptionRecord = NULL; record.ExceptionAddress = (void *)context->Eip; record.NumberParameters = 0; pRecord = &record; } pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND); TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags ); TRACE( "eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n", context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi ); TRACE( "ebp=%08x esp=%08x eip=%08x cs=%04x ds=%04x fs=%04x gs=%04x flags=%08x\n", context->Ebp, context->Esp, context->Eip, LOWORD(context->SegCs), LOWORD(context->SegDs), LOWORD(context->SegFs), LOWORD(context->SegGs), context->EFlags ); /* get chain of exception frames */ frame = NtCurrentTeb()->Tib.ExceptionList; while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame)) { /* Check frame address */ if (pEndFrame && (frame > pEndFrame)) raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord ); if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord ); /* Call handler */ TRACE( "calling handler at %p code=%x flags=%x\n", frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags ); res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler ); TRACE( "handler at %p returned %x\n", frame->Handler, res ); switch(res) { case ExceptionContinueSearch: break; case ExceptionCollidedUnwind: frame = dispatch; break; default: raise_status( STATUS_INVALID_DISPOSITION, pRecord ); break; } frame = __wine_pop_frame( frame ); } NtContinue( context, FALSE ); } __ASM_STDCALL_FUNC( RtlUnwind, 16, "pushl %ebp\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_rel_offset %ebp,0\n\t") "movl %esp,%ebp\n\t" __ASM_CFI(".cfi_def_cfa_register %ebp\n\t") "leal -(0x2cc+8)(%esp),%esp\n\t" /* sizeof(CONTEXT) + alignment */ "pushl %eax\n\t" "leal 4(%esp),%eax\n\t" /* context */ "xchgl %eax,(%esp)\n\t" "call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t" "leal 24(%ebp),%eax\n\t" "movl %eax,0xc4(%esp)\n\t" /* context->Esp */ "pushl %esp\n\t" "pushl 20(%ebp)\n\t" "pushl 16(%ebp)\n\t" "pushl 12(%ebp)\n\t" "pushl 8(%ebp)\n\t" "call " __ASM_STDCALL("__regs_RtlUnwind",20) "\n\t" "leave\n\t" __ASM_CFI(".cfi_def_cfa %esp,4\n\t") __ASM_CFI(".cfi_same_value %ebp\n\t") "ret $16" ) /* actually never returns */ /******************************************************************* * raise_exception_full_context * * Raise an exception with the full CPU context. */ void raise_exception_full_context( EXCEPTION_RECORD *rec, CONTEXT *context ) { save_fpu( context ); save_fpux( context ); /* FIXME: xstate */ context->Dr0 = x86_thread_data()->dr0; context->Dr1 = x86_thread_data()->dr1; context->Dr2 = x86_thread_data()->dr2; context->Dr3 = x86_thread_data()->dr3; context->Dr6 = x86_thread_data()->dr6; context->Dr7 = x86_thread_data()->dr7; context->ContextFlags |= CONTEXT_DEBUG_REGISTERS; RtlRaiseStatus( NtRaiseException( rec, context, TRUE )); } /*********************************************************************** * RtlRaiseException (NTDLL.@) */ __ASM_STDCALL_FUNC( RtlRaiseException, 4, "pushl %ebp\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_rel_offset %ebp,0\n\t") "movl %esp,%ebp\n\t" __ASM_CFI(".cfi_def_cfa_register %ebp\n\t") "leal -0x2cc(%esp),%esp\n\t" /* sizeof(CONTEXT) */ "pushl %esp\n\t" /* context */ "call " __ASM_STDCALL("RtlCaptureContext",4) "\n\t" "movl 4(%ebp),%eax\n\t" /* return address */ "movl 8(%ebp),%ecx\n\t" /* rec */ "movl %eax,12(%ecx)\n\t" /* rec->ExceptionAddress */ "leal 12(%ebp),%eax\n\t" "movl %eax,0xc4(%esp)\n\t" /* context->Esp */ "movl %esp,%eax\n\t" "pushl %eax\n\t" "pushl %ecx\n\t" "call " __ASM_NAME("raise_exception_full_context") "\n\t" "leave\n\t" __ASM_CFI(".cfi_def_cfa %esp,4\n\t") __ASM_CFI(".cfi_same_value %ebp\n\t") "ret $4" ) /* actually never returns */ /************************************************************************* * RtlCaptureStackBackTrace (NTDLL.@) */ USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash ) { CONTEXT context; ULONG i; ULONG *frame; RtlCaptureContext( &context ); if (hash) *hash = 0; frame = (ULONG *)context.Ebp; while (skip--) { if (!is_valid_frame( frame )) return 0; frame = (ULONG *)*frame; } for (i = 0; i < count; i++) { if (!is_valid_frame( frame )) break; buffer[i] = (void *)frame[1]; if (hash) *hash += frame[1]; frame = (ULONG *)*frame; } return i; } /********************************************************************** * DbgBreakPoint (NTDLL.@) */ __ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret" "\n\tnop; nop; nop; nop; nop; nop; nop; nop" "\n\tnop; nop; nop; nop; nop; nop" ); /********************************************************************** * DbgUserBreakPoint (NTDLL.@) */ __ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret" "\n\tnop; nop; nop; nop; nop; nop; nop; nop" "\n\tnop; nop; nop; nop; nop; nop" ); /********************************************************************** * NtCurrentTeb (NTDLL.@) */ __ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" ) /************************************************************************** * _chkstk (NTDLL.@) */ __ASM_GLOBAL_FUNC( _chkstk, "negl %eax\n\t" "addl %esp,%eax\n\t" "xchgl %esp,%eax\n\t" "movl 0(%eax),%eax\n\t" /* copy return address from old location */ "movl %eax,0(%esp)\n\t" "ret" ) /************************************************************************** * _alloca_probe (NTDLL.@) */ __ASM_GLOBAL_FUNC( _alloca_probe, "negl %eax\n\t" "addl %esp,%eax\n\t" "xchgl %esp,%eax\n\t" "movl 0(%eax),%eax\n\t" /* copy return address from old location */ "movl %eax,0(%esp)\n\t" "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\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_rel_offset %ebp,0\n\t") "movl %esp,%ebp\n\t" __ASM_CFI(".cfi_def_cfa_register %ebp\n\t") "pushl %ebx\n\t" __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t") "movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */ "pushl 24(%ebp)\n\t" "pushl 20(%ebp)\n\t" "pushl 16(%ebp)\n\t" "pushl 12(%ebp)\n\t" "pushl 8(%ebp)\n\t" "call " __ASM_NAME("call_exception_handler") "\n\t" "popl %ebx\n\t" __ASM_CFI(".cfi_same_value %ebx\n\t") "leave\n" __ASM_CFI(".cfi_def_cfa %esp,4\n\t") __ASM_CFI(".cfi_same_value %ebp\n\t") "ret" ) __ASM_GLOBAL_FUNC(call_exception_handler, "pushl %ebp\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") __ASM_CFI(".cfi_rel_offset %ebp,0\n\t") "movl %esp,%ebp\n\t" __ASM_CFI(".cfi_def_cfa_register %ebp\n\t") "subl $12,%esp\n\t" "pushl 12(%ebp)\n\t" /* make any exceptions in this... */ "pushl %edx\n\t" /* handler be handled by... */ ".byte 0x64\n\t" "pushl (0)\n\t" /* nested_handler (passed in edx). */ ".byte 0x64\n\t" "movl %esp,(0)\n\t" /* push the new exception frame onto the exception stack. */ "pushl 20(%ebp)\n\t" "pushl 16(%ebp)\n\t" "pushl 12(%ebp)\n\t" "pushl 8(%ebp)\n\t" "movl 24(%ebp), %ecx\n\t" /* (*1) */ "call *%ecx\n\t" /* call handler. (*2) */ ".byte 0x64\n\t" "movl (0), %esp\n\t" /* restore previous... (*3) */ ".byte 0x64\n\t" "popl (0)\n\t" /* exception frame. */ "movl %ebp, %esp\n\t" /* restore saved stack, in case it was corrupted */ "popl %ebp\n\t" __ASM_CFI(".cfi_def_cfa %esp,4\n\t") __ASM_CFI(".cfi_same_value %ebp\n\t") "ret $20" ) /* (*4) */ #endif /* __i386__ */