Sweden-Number/dlls/ntdll/signal_arm.c

/*
 * ARM signal handling routines
 *
 * Copyright 2002 Marcus Meissner, SuSE Linux AG
 * Copyright 2010-2013, 2015 André Hentschel
 *
 * 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 __arm__

#include <stdlib.h>
#include <stdarg.h>

#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "wine/exception.h"
#include "ntdll_misc.h"
#include "wine/debug.h"
#include "winnt.h"

WINE_DEFAULT_DEBUG_CHANNEL(seh);

typedef struct _SCOPE_TABLE
{
    ULONG Count;
    struct
    {
        ULONG BeginAddress;
        ULONG EndAddress;
        ULONG HandlerAddress;
        ULONG JumpTarget;
    } ScopeRecord[1];
} SCOPE_TABLE, *PSCOPE_TABLE;


/* layering violation: the setjmp buffer is defined in msvcrt, but used by RtlUnwindEx */
struct MSVCRT_JUMP_BUFFER
{
    unsigned long Frame;
    unsigned long R4;
    unsigned long R5;
    unsigned long R6;
    unsigned long R7;
    unsigned long R8;
    unsigned long R9;
    unsigned long R10;
    unsigned long R11;
    unsigned long Sp;
    unsigned long Pc;
    unsigned long Fpscr;
    unsigned long long D[8];
};


static void dump_scope_table( ULONG64 base, const SCOPE_TABLE *table )
{
    unsigned int i;

    TRACE( "scope table at %p\n", table );
    for (i = 0; i < table->Count; i++)
        TRACE( "  %u: %lx-%lx handler %lx target %lx\n", i,
               base + table->ScopeRecord[i].BeginAddress,
               base + table->ScopeRecord[i].EndAddress,
               base + table->ScopeRecord[i].HandlerAddress,
               base + table->ScopeRecord[i].JumpTarget );
}

/*******************************************************************
 *         is_valid_frame
 */
static inline BOOL is_valid_frame( ULONG_PTR frame )
{
    if (frame & 3) return FALSE;
    return ((void *)frame >= NtCurrentTeb()->Tib.StackLimit &&
            (void *)frame <= NtCurrentTeb()->Tib.StackBase);
}


/**************************************************************************
 *		__chkstk (NTDLL.@)
 *
 * Incoming r4 contains words to allocate, converting to bytes then return
 */
__ASM_GLOBAL_FUNC( __chkstk, "lsl r4, r4, #2\n\t"
                             "bx lr" )

/***********************************************************************
 *		RtlCaptureContext (NTDLL.@)
 */
__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
                    "str r1, [r0, #0x8]\n\t"   /* context->R1 */
                    "mov r1, #0x0200000\n\t"   /* CONTEXT_ARM */
                    "add r1, r1, #0x7\n\t"     /* CONTEXT_CONTROL|CONTEXT_INTEGER|CONTEXT_FLOATING_POINT */
                    "str r1, [r0]\n\t"         /* context->ContextFlags */
                    "str SP, [r0, #0x38]\n\t"  /* context->Sp */
                    "str LR, [r0, #0x40]\n\t"  /* context->Pc */
                    "mrs r1, CPSR\n\t"
                    "bfi r1, lr, #5, #1\n\t"   /* Thumb bit */
                    "str r1, [r0, #0x44]\n\t"  /* context->Cpsr */
                    "mov r1, #0\n\t"
                    "str r1, [r0, #0x4]\n\t"   /* context->R0 */
                    "str r1, [r0, #0x3c]\n\t"  /* context->Lr */
                    "add r0, #0x0c\n\t"
                    "stm r0, {r2-r12}\n\t"     /* context->R2..R12 */
#ifndef __SOFTFP__
                    "add r0, #0x44\n\t"        /* 0x50 - 0x0c */
                    "vstm r0, {d0-d15}\n\t"    /* context->D0-D15 */
#endif
                    "bx lr" )


/**********************************************************************
 *           virtual_unwind
 */
static NTSTATUS virtual_unwind( ULONG type, DISPATCHER_CONTEXT *dispatch, CONTEXT *context )
{
    LDR_DATA_TABLE_ENTRY *module;
    NTSTATUS status;

    dispatch->ImageBase        = 0;
    dispatch->ScopeIndex       = 0;
    dispatch->EstablisherFrame = 0;
    dispatch->ControlPc        = context->Pc;
    /*
     * TODO: CONTEXT_UNWOUND_TO_CALL should be cleared if unwound past a
     * signal frame.
     */
    dispatch->ControlPcIsUnwound = (context->ContextFlags & CONTEXT_UNWOUND_TO_CALL) != 0;

    /* first look for PE exception information */

    if ((dispatch->FunctionEntry = lookup_function_info(
             context->Pc - (dispatch->ControlPcIsUnwound ? 2 : 0),
             (ULONG_PTR*)&dispatch->ImageBase, &module )))
    {
        dispatch->LanguageHandler = RtlVirtualUnwind( type, dispatch->ImageBase, context->Pc,
                                                      dispatch->FunctionEntry, context,
                                                      &dispatch->HandlerData, (ULONG_PTR *)&dispatch->EstablisherFrame,
                                                      NULL );
        return STATUS_SUCCESS;
    }

    /* then look for host system exception information */

    if (!module || (module->Flags & LDR_WINE_INTERNAL))
    {
        status = unix_funcs->unwind_builtin_dll( type, dispatch, context );
        if (status != STATUS_SUCCESS) return status;

        if (dispatch->EstablisherFrame)
        {
            dispatch->FunctionEntry = NULL;
            if (dispatch->LanguageHandler && !module)
            {
                FIXME( "calling personality routine in system library not supported yet\n" );
                dispatch->LanguageHandler = NULL;
            }
            return STATUS_SUCCESS;
        }
    }
    else
    {
        status = context->Pc != context->Lr ?
                 STATUS_SUCCESS : STATUS_INVALID_DISPOSITION;
        WARN( "exception data not found in %s for %p, LR %p, status %x\n",
               debugstr_w(module->BaseDllName.Buffer), (void*) context->Pc,
               (void*) context->Lr, status );
        dispatch->EstablisherFrame = context->Sp;
        dispatch->LanguageHandler = NULL;
        context->Pc = context->Lr;
        context->ContextFlags |= CONTEXT_UNWOUND_TO_CALL;
        return status;
    }

    dispatch->EstablisherFrame = context->Sp;
    dispatch->LanguageHandler = NULL;
    context->Pc = context->Lr;
    context->ContextFlags |= CONTEXT_UNWOUND_TO_CALL;
    return STATUS_SUCCESS;
}


struct unwind_exception_frame
{
    EXCEPTION_REGISTRATION_RECORD frame;
    DISPATCHER_CONTEXT *dispatch;
};

/**********************************************************************
 *           unwind_exception_handler
 *
 * Handler for exceptions happening while calling an unwind handler.
 */
static DWORD __cdecl unwind_exception_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    struct unwind_exception_frame *unwind_frame = (struct unwind_exception_frame *)frame;
    DISPATCHER_CONTEXT *dispatch = (DISPATCHER_CONTEXT *)dispatcher;

    /* copy the original dispatcher into the current one, except for the TargetIp */
    dispatch->ControlPc        = unwind_frame->dispatch->ControlPc;
    dispatch->ImageBase        = unwind_frame->dispatch->ImageBase;
    dispatch->FunctionEntry    = unwind_frame->dispatch->FunctionEntry;
    dispatch->EstablisherFrame = unwind_frame->dispatch->EstablisherFrame;
    dispatch->ContextRecord    = unwind_frame->dispatch->ContextRecord;
    dispatch->LanguageHandler  = unwind_frame->dispatch->LanguageHandler;
    dispatch->HandlerData      = unwind_frame->dispatch->HandlerData;
    dispatch->HistoryTable     = unwind_frame->dispatch->HistoryTable;
    dispatch->ScopeIndex       = unwind_frame->dispatch->ScopeIndex;
    TRACE( "detected collided unwind\n" );
    return ExceptionCollidedUnwind;
}

/**********************************************************************
 *           call_unwind_handler
 *
 * Call a single unwind handler.
 */
static DWORD call_unwind_handler( EXCEPTION_RECORD *rec, DISPATCHER_CONTEXT *dispatch )
{
    struct unwind_exception_frame frame;
    DWORD res;

    frame.frame.Handler = unwind_exception_handler;
    frame.dispatch = dispatch;
    __wine_push_frame( &frame.frame );

    TRACE( "calling handler %p (rec=%p, frame=0x%x context=%p, dispatch=%p)\n",
         dispatch->LanguageHandler, rec, dispatch->EstablisherFrame, dispatch->ContextRecord, dispatch );
    res = dispatch->LanguageHandler( rec, (void *)dispatch->EstablisherFrame, dispatch->ContextRecord, dispatch );
    TRACE( "handler %p returned %x\n", dispatch->LanguageHandler, res );

    __wine_pop_frame( &frame.frame );

    switch (res)
    {
    case ExceptionContinueSearch:
    case ExceptionCollidedUnwind:
        break;
    default:
        raise_status( STATUS_INVALID_DISPOSITION, rec );
        break;
    }

    return res;
}


/**********************************************************************
 *           call_teb_unwind_handler
 *
 * Call a single unwind handler from the TEB chain.
 */
static DWORD call_teb_unwind_handler( EXCEPTION_RECORD *rec, DISPATCHER_CONTEXT *dispatch,
                                     EXCEPTION_REGISTRATION_RECORD *teb_frame )
{
    DWORD res;

    TRACE( "calling TEB handler %p (rec=%p, frame=%p context=%p, dispatch=%p)\n",
           teb_frame->Handler, rec, teb_frame, dispatch->ContextRecord, dispatch );
    res = teb_frame->Handler( rec, teb_frame, dispatch->ContextRecord, (EXCEPTION_REGISTRATION_RECORD**)dispatch );
    TRACE( "handler at %p returned %u\n", teb_frame->Handler, res );

    switch (res)
    {
    case ExceptionContinueSearch:
    case ExceptionCollidedUnwind:
        break;
    default:
        raise_status( STATUS_INVALID_DISPOSITION, rec );
        break;
    }

    return res;
}


static DWORD __cdecl nested_exception_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
        rec->ExceptionFlags |= EH_NESTED_CALL;

    return ExceptionContinueSearch;
}


/**********************************************************************
 *           call_handler
 *
 * Call a single exception handler.
 * FIXME: Handle nested exceptions.
 */
static DWORD call_handler( EXCEPTION_RECORD *rec, CONTEXT *context, DISPATCHER_CONTEXT *dispatch )
{
    EXCEPTION_REGISTRATION_RECORD frame;
    DWORD res;

    frame.Handler = nested_exception_handler;
    __wine_push_frame( &frame );

    TRACE( "calling handler %p (rec=%p, frame=0x%x context=%p, dispatch=%p)\n",
           dispatch->LanguageHandler, rec, dispatch->EstablisherFrame, dispatch->ContextRecord, dispatch );
    res = dispatch->LanguageHandler( rec, (void *)dispatch->EstablisherFrame, context, dispatch );
    TRACE( "handler at %p returned %u\n", dispatch->LanguageHandler, res );

    rec->ExceptionFlags &= EH_NONCONTINUABLE;
    __wine_pop_frame( &frame );
    return res;
}


/**********************************************************************
 *           call_teb_handler
 *
 * Call a single exception handler from the TEB chain.
 * FIXME: Handle nested exceptions.
 */
static DWORD call_teb_handler( EXCEPTION_RECORD *rec, CONTEXT *context, DISPATCHER_CONTEXT *dispatch,
                                  EXCEPTION_REGISTRATION_RECORD *teb_frame )
{
    DWORD res;

    TRACE( "calling TEB handler %p (rec=%p, frame=%p context=%p, dispatch=%p)\n",
           teb_frame->Handler, rec, teb_frame, dispatch->ContextRecord, dispatch );
    res = teb_frame->Handler( rec, teb_frame, context, (EXCEPTION_REGISTRATION_RECORD**)dispatch );
    TRACE( "handler at %p returned %u\n", teb_frame->Handler, res );
    return res;
}


/**********************************************************************
 *           call_function_handlers
 *
 * Call the per-function handlers.
 */
static NTSTATUS call_function_handlers( EXCEPTION_RECORD *rec, CONTEXT *orig_context )
{
    EXCEPTION_REGISTRATION_RECORD *teb_frame = NtCurrentTeb()->Tib.ExceptionList;
    UNWIND_HISTORY_TABLE table;
    DISPATCHER_CONTEXT dispatch;
    CONTEXT context, prev_context;
    NTSTATUS status;

    context = *orig_context;
    dispatch.TargetPc      = 0;
    dispatch.ContextRecord = &context;
    dispatch.HistoryTable  = &table;
    prev_context = context;
    dispatch.NonVolatileRegisters = (BYTE *)&prev_context.R4;

    for (;;)
    {
        status = virtual_unwind( UNW_FLAG_EHANDLER, &dispatch, &context );
        if (status != STATUS_SUCCESS) return status;

    unwind_done:
        if (!dispatch.EstablisherFrame) break;

        if (!is_valid_frame( dispatch.EstablisherFrame ))
        {
            ERR( "invalid frame %x (%p-%p)\n", dispatch.EstablisherFrame,
                 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
            rec->ExceptionFlags |= EH_STACK_INVALID;
            break;
        }

        if (dispatch.LanguageHandler)
        {
            switch (call_handler( rec, orig_context, &dispatch ))
            {
            case ExceptionContinueExecution:
                if (rec->ExceptionFlags & EH_NONCONTINUABLE) return STATUS_NONCONTINUABLE_EXCEPTION;
                return STATUS_SUCCESS;
            case ExceptionContinueSearch:
                break;
            case ExceptionNestedException:
                FIXME( "nested exception\n" );
                break;
            case ExceptionCollidedUnwind: {
                ULONG_PTR frame;

                context = *dispatch.ContextRecord;
                dispatch.ContextRecord = &context;
                RtlVirtualUnwind( UNW_FLAG_NHANDLER, dispatch.ImageBase,
                                  dispatch.ControlPc, dispatch.FunctionEntry,
                                  &context, (PVOID *)&dispatch.HandlerData, &frame, NULL );
                goto unwind_done;
            }
            default:
                return STATUS_INVALID_DISPOSITION;
            }
        }
        /* hack: call wine handlers registered in the tib list */
        else while ((DWORD)teb_frame < context.Sp)
        {
            TRACE( "found wine frame %p rsp %x handler %p\n",
                    teb_frame, context.Sp, teb_frame->Handler );
            dispatch.EstablisherFrame = (DWORD)teb_frame;
            switch (call_teb_handler( rec, orig_context, &dispatch, teb_frame ))
            {
            case ExceptionContinueExecution:
                if (rec->ExceptionFlags & EH_NONCONTINUABLE) return STATUS_NONCONTINUABLE_EXCEPTION;
                return STATUS_SUCCESS;
            case ExceptionContinueSearch:
                break;
            case ExceptionNestedException:
                FIXME( "nested exception\n" );
                break;
            case ExceptionCollidedUnwind: {
                ULONG_PTR frame;

                context = *dispatch.ContextRecord;
                dispatch.ContextRecord = &context;
                RtlVirtualUnwind( UNW_FLAG_NHANDLER, dispatch.ImageBase,
                                  dispatch.ControlPc, dispatch.FunctionEntry,
                                  &context, (PVOID *)&dispatch.HandlerData, &frame, NULL );
                teb_frame = teb_frame->Prev;
                goto unwind_done;
            }
            default:
                return STATUS_INVALID_DISPOSITION;
            }
            teb_frame = teb_frame->Prev;
        }

        if (context.Sp == (DWORD)NtCurrentTeb()->Tib.StackBase) break;
        prev_context = context;
    }
    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 pc=%08x tid=%04x\n",
           rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
           context->Pc, 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 if (rec->ExceptionCode == EXCEPTION_WINE_NAME_THREAD && rec->ExceptionInformation[0] == 0x1000)
    {
        WARN( "Thread %04x renamed to %s\n", (DWORD)rec->ExceptionInformation[2], debugstr_a((char *)rec->ExceptionInformation[1]) );
    }
    else if (rec->ExceptionCode == DBG_PRINTEXCEPTION_C)
    {
        WARN( "%s\n", debugstr_an((char *)rec->ExceptionInformation[1], rec->ExceptionInformation[0] - 1) );
    }
    else if (rec->ExceptionCode == DBG_PRINTEXCEPTION_WIDE_C)
    {
        WARN( "%s\n", debugstr_wn((WCHAR *)rec->ExceptionInformation[1], rec->ExceptionInformation[0] - 1) );
    }
    else
    {
        if (rec->ExceptionCode == STATUS_ASSERTION_FAILURE)
            ERR( "%s exception (code=%x) raised\n", debugstr_exception_code(rec->ExceptionCode), rec->ExceptionCode );
        else
            WARN( "%s exception (code=%x) raised\n", debugstr_exception_code(rec->ExceptionCode), rec->ExceptionCode );

        TRACE( " r0=%08x r1=%08x r2=%08x r3=%08x r4=%08x r5=%08x\n",
               context->R0, context->R1, context->R2, context->R3, context->R4, context->R5 );
        TRACE( " r6=%08x r7=%08x r8=%08x r9=%08x r10=%08x r11=%08x\n",
               context->R6, context->R7, context->R8, context->R9, context->R10, context->R11 );
        TRACE( " r12=%08x sp=%08x lr=%08x pc=%08x cpsr=%08x\n",
               context->R12, context->Sp, context->Lr, context->Pc, context->Cpsr );
    }

    if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
        NtContinue( context, FALSE );

    if ((status = call_function_handlers( rec, context )) == STATUS_SUCCESS)
        NtContinue( context, FALSE );

    if (status != STATUS_UNHANDLED_EXCEPTION) RtlRaiseStatus( status );
    return NtRaiseException( rec, context, FALSE );
}


/*******************************************************************
 *		KiUserApcDispatcher (NTDLL.@)
 */
void WINAPI KiUserApcDispatcher( CONTEXT *context, ULONG_PTR ctx, ULONG_PTR arg1, ULONG_PTR arg2,
                                 PNTAPCFUNC func )
{
    func( ctx, arg1, arg2 );
    NtContinue( context, TRUE );
}


/*******************************************************************
 *		KiUserCallbackDispatcher (NTDLL.@)
 */
void WINAPI KiUserCallbackDispatcher( ULONG id, void *args, ULONG len )
{
    NTSTATUS (WINAPI *func)(void *, ULONG) = ((void **)NtCurrentTeb()->Peb->KernelCallbackTable)[id];

    RtlRaiseStatus( NtCallbackReturn( NULL, 0, func( args, len )));
}


/***********************************************************************
 * Definitions for Win32 unwind tables
 */

struct unwind_info
{
    DWORD function_length : 18;
    DWORD version : 2;
    DWORD x : 1;
    DWORD e : 1;
    DWORD f : 1;
    DWORD epilog : 5;
    DWORD codes : 4;
};

struct unwind_info_ext
{
    WORD epilog;
    BYTE codes;
    BYTE reserved;
};

struct unwind_info_epilog
{
    DWORD offset : 18;
    DWORD res : 2;
    DWORD cond : 4;
    DWORD index : 8;
};

static const BYTE unwind_code_len[256] =
{
/* 00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
/* 20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
/* 40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
/* 60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
/* 80 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* a0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* c0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
/* e0 */ 1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,4,3,4,1,1,1,1,1
};

static const BYTE unwind_instr_len[256] =
{
/* 00 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* 20 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* 40 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* 60 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
/* 80 */ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
/* a0 */ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
/* c0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,4,4,4,4,
/* e0 */ 4,4,4,4,4,4,4,4,4,4,4,4,2,2,2,4,0,0,0,0,0,4,4,2,2,4,4,2,4,2,4,0
};

/***********************************************************************
 *           get_sequence_len
 */
static unsigned int get_sequence_len( BYTE *ptr, BYTE *end, int include_end )
{
    unsigned int ret = 0;

    while (ptr < end)
    {
        if (*ptr >= 0xfd)
        {
            if (*ptr <= 0xfe && include_end)
                ret += unwind_instr_len[*ptr];
            break;
        }
        ret += unwind_instr_len[*ptr];
        ptr += unwind_code_len[*ptr];
    }
    return ret;
}


/***********************************************************************
 *           pop_regs_mask
 */
static void pop_regs_mask( int mask, CONTEXT *context,
                           KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    int i;
    for (i = 0; i <= 12; i++)
    {
        if (!(mask & (1 << i))) continue;
        if (ptrs && i >= 4 && i <= 11) (&ptrs->R4)[i - 4] = (DWORD *)context->Sp;
        if (i >= 4) (&context->R0)[i] = *(DWORD *)context->Sp;
        context->Sp += 4;
    }
}


/***********************************************************************
 *           pop_regs_range
 */
static void pop_regs_range( int last, CONTEXT *context,
                            KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    int i;
    for (i = 4; i <= last; i++)
    {
        if (ptrs) (&ptrs->R4)[i - 4] = (DWORD *)context->Sp;
        (&context->R0)[i] = *(DWORD *)context->Sp;
        context->Sp += 4;
    }
}


/***********************************************************************
 *           pop_lr
 */
static void pop_lr( int increment, CONTEXT *context,
                    KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    if (ptrs) ptrs->Lr = (DWORD *)context->Sp;
    context->Lr = *(DWORD *)context->Sp;
    context->Sp += increment;
}


/***********************************************************************
 *           pop_fpregs_range
 */
static void pop_fpregs_range( int first, int last, CONTEXT *context,
                              KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    int i;
    for (i = first; i <= last; i++)
    {
        if (ptrs && i >= 8 && i <= 15) (&ptrs->D8)[i - 8] = (ULONGLONG *)context->Sp;
        context->u.D[i] = *(ULONGLONG *)context->Sp;
        context->Sp += 8;
    }
}


/***********************************************************************
 *           process_unwind_codes
 */
static void process_unwind_codes( BYTE *ptr, BYTE *end, CONTEXT *context,
                                  KNONVOLATILE_CONTEXT_POINTERS *ptrs, int skip )
{
    unsigned int val, len;
    unsigned int i;

    /* skip codes */
    while (ptr < end && skip)
    {
        if (*ptr >= 0xfd) break;
        skip -= unwind_instr_len[*ptr];
        ptr += unwind_code_len[*ptr];
    }

    while (ptr < end)
    {
        len = unwind_code_len[*ptr];
        if (ptr + len > end) break;
        val = 0;
        for (i = 0; i < len; i++)
            val = (val << 8) | ptr[i];

        if (*ptr <= 0x7f)      /* add sp, sp, #x */
            context->Sp += 4 * (val & 0x7f);
        else if (*ptr <= 0xbf) /* pop {r0-r12,lr} */
        {
            pop_regs_mask( val & 0x1fff, context, ptrs );
            if (val & 0x2000)
                pop_lr( 4, context, ptrs );
        }
        else if (*ptr <= 0xcf) /* mov sp, rX */
            context->Sp = (&context->R0)[val & 0x0f];
        else if (*ptr <= 0xd7) /* pop {r4-rX,lr} */
        {
            pop_regs_range( (val & 0x03) + 4, context, ptrs );
            if (val & 0x04)
                pop_lr( 4, context, ptrs );
        }
        else if (*ptr <= 0xdf) /* pop {r4-rX,lr} */
        {
            pop_regs_range( (val & 0x03) + 8, context, ptrs );
            if (val & 0x04)
                pop_lr( 4, context, ptrs );
        }
        else if (*ptr <= 0xe7) /* vpop {d8-dX} */
            pop_fpregs_range( 8, (val & 0x07) + 8, context, ptrs );
        else if (*ptr <= 0xeb) /* add sp, sp, #x */
            context->Sp += 4 * (val & 0x3ff);
        else if (*ptr <= 0xed) /* pop {r0-r12,lr} */
        {
            pop_regs_mask( val & 0xff, context, ptrs );
            if (val & 0x100)
                pop_lr( 4, context, ptrs );
        }
        else if (*ptr <= 0xee) /* Microsoft-specific 0x00-0x0f, Available 0x10-0xff */
            WARN( "unsupported code %02x\n", *ptr );
        else if (*ptr <= 0xef && ((val & 0xff) <= 0x0f)) /* ldr lr, [sp], #x */
            pop_lr( 4 * (val & 0x0f), context, ptrs );
        else if (*ptr <= 0xf4) /* Available */
            WARN( "unsupported code %02x\n", *ptr );
        else if (*ptr <= 0xf5) /* vpop {dS-dE} */
            pop_fpregs_range( (val & 0xf0) >> 4, (val & 0x0f), context, ptrs );
        else if (*ptr <= 0xf6) /* vpop {dS-dE} */
            pop_fpregs_range( ((val & 0xf0) >> 4) + 16, (val & 0x0f) + 16, context, ptrs );
        else if (*ptr == 0xf7 || *ptr == 0xf9) /* add sp, sp, #x */
            context->Sp += 4 * (val & 0xffff);
        else if (*ptr == 0xf8 || *ptr == 0xfa) /* add sp, sp, #x */
            context->Sp += 4 * (val & 0xffffff);
        else if (*ptr <= 0xfc)  /* nop */
            /* nop */ ;
        else                    /* end */
            break;

        ptr += len;
    }
}


/***********************************************************************
 *           unwind_packed_data
 */
static void *unwind_packed_data( ULONG_PTR base, ULONG_PTR pc, RUNTIME_FUNCTION *func,
                                 CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    int i, pos = 0;
    int pf = 0, ef = 0, fpoffset = 0, stack = func->u.s.StackAdjust;
    int prologue_regmask = 0;
    int epilogue_regmask = 0;
    unsigned int offset, len;
    BYTE prologue[10], *prologue_end, epilogue[20], *epilogue_end;

    TRACE( "function %lx-%lx: len=%#x flag=%x ret=%u H=%u reg=%u R=%u L=%u C=%u stackadjust=%x\n",
           base + func->BeginAddress, base + func->BeginAddress + func->u.s.FunctionLength * 2,
           func->u.s.FunctionLength, func->u.s.Flag, func->u.s.Ret,
           func->u.s.H, func->u.s.Reg, func->u.s.R, func->u.s.L, func->u.s.C, func->u.s.StackAdjust );

    offset = (pc - base) - func->BeginAddress;
    if (func->u.s.StackAdjust >= 0x03f4)
    {
        pf = func->u.s.StackAdjust & 0x04;
        ef = func->u.s.StackAdjust & 0x08;
        stack = (func->u.s.StackAdjust & 3) + 1;
    }

    if (!func->u.s.R || pf)
    {
        int first = 4, last = func->u.s.Reg + 4;
        if (pf)
        {
            first = (~func->u.s.StackAdjust) & 3;
            if (func->u.s.R)
                last = 3;
        }
        for (i = first; i <= last; i++)
            prologue_regmask |= 1 << i;
        fpoffset = last + 1 - first;
    }

    if (!func->u.s.R || ef)
    {
        int first = 4, last = func->u.s.Reg + 4;
        if (ef)
        {
            first = (~func->u.s.StackAdjust) & 3;
            if (func->u.s.R)
                last = 3;
        }
        for (i = first; i <= last; i++)
            epilogue_regmask |= 1 << i;
    }

    if (func->u.s.C)
    {
        prologue_regmask |= 1 << 11;
        epilogue_regmask |= 1 << 11;
    }

    if (func->u.s.L)
    {
        prologue_regmask |= 1 << 14; /* lr */
        if (func->u.s.Ret != 0)
            epilogue_regmask |= 1 << 14; /* lr */
        else if (!func->u.s.H)
            epilogue_regmask |= 1 << 15; /* pc */
    }

    /* Synthesize prologue opcodes */
    if (stack && !pf)
    {
        if (stack <= 0x7f)
        {
            prologue[pos++] = stack; /* sub sp, sp, #x */
        }
        else
        {
            prologue[pos++] = 0xe8 | (stack >> 8); /* sub.w sp, sp, #x */
            prologue[pos++] = stack & 0xff;
        }
    }

    if (func->u.s.R && func->u.s.Reg != 7)
        prologue[pos++] = 0xe0 | func->u.s.Reg; /* vpush {d8-dX} */

    if (func->u.s.C && fpoffset == 0)
        prologue[pos++] = 0xfb; /* mov r11, sp - handled as nop16 */
    else if (func->u.s.C)
        prologue[pos++] = 0xfc; /* add r11, sp, #x - handled as nop32 */

    if (prologue_regmask & 0xf00) /* r8-r11 set */
    {
        int bitmask = prologue_regmask & 0x1fff;
        if (prologue_regmask & (1 << 14)) /* lr */
            bitmask |= 0x2000;
        prologue[pos++] = 0x80 | (bitmask >> 8); /* push.w {r0-r12,lr} */
        prologue[pos++] = bitmask & 0xff;
    }
    else if (prologue_regmask) /* r0-r7, lr set */
    {
        int bitmask = prologue_regmask & 0xff;
        if (prologue_regmask & (1 << 14)) /* lr */
            bitmask |= 0x100;
        prologue[pos++] = 0xec | (bitmask >> 8); /* push {r0-r7,lr} */
        prologue[pos++] = bitmask & 0xff;
    }

    if (func->u.s.H)
        prologue[pos++] = 0x04; /* push {r0-r3} - handled as sub sp, sp, #16 */

    prologue[pos++] = 0xff; /* end */
    prologue_end = &prologue[pos];

    /* Synthesize epilogue opcodes */
    pos = 0;
    if (stack && !ef)
    {
        if (stack <= 0x7f)
        {
            epilogue[pos++] = stack; /* sub sp, sp, #x */
        }
        else
        {
            epilogue[pos++] = 0xe8 | (stack >> 8); /* sub.w sp, sp, #x */
            epilogue[pos++] = stack & 0xff;
        }
    }

    if (func->u.s.R && func->u.s.Reg != 7)
        epilogue[pos++] = 0xe0 | func->u.s.Reg; /* vpush {d8-dX} */

    if (epilogue_regmask & 0x7f00) /* r8-r11, lr set */
    {
        int bitmask = epilogue_regmask & 0x1fff;
        if (epilogue_regmask & (3 << 14)) /* lr or pc */
            bitmask |= 0x2000;
        epilogue[pos++] = 0x80 | (bitmask >> 8); /* push.w {r0-r12,lr} */
        epilogue[pos++] = bitmask & 0xff;
    }
    else if (epilogue_regmask) /* r0-r7, pc set */
    {
        int bitmask = epilogue_regmask & 0xff;
        if (epilogue_regmask & (1 << 15)) /* pc */
            bitmask |= 0x100; /* lr */
        epilogue[pos++] = 0xec | (bitmask >> 8); /* push {r0-r7,lr} */
        epilogue[pos++] = bitmask & 0xff;
    }

    if (func->u.s.H && !(func->u.s.L && func->u.s.Ret == 0))
        epilogue[pos++] = 0x04; /* add sp, sp, #16 */
    else if (func->u.s.H && (func->u.s.L && func->u.s.Ret == 0))
    {
        epilogue[pos++] = 0xef; /* ldr lr, [sp], #20 */
        epilogue[pos++] = 5;
    }

    if (func->u.s.Ret == 1)
        epilogue[pos++] = 0xfd; /* bx lr */
    else if (func->u.s.Ret == 2)
        epilogue[pos++] = 0xfe; /* b address */
    else
        epilogue[pos++] = 0xff; /* end */
    epilogue_end = &epilogue[pos];

    if (func->u.s.Flag == 1 && offset < 4 * (prologue_end - prologue)) {
        /* Check prologue */
        len = get_sequence_len( prologue, prologue_end, 0 );
        if (offset < len)
        {
            process_unwind_codes( prologue, prologue_end, context, ptrs, len - offset );
            return NULL;
        }
    }

    if (func->u.s.Ret != 3 && 2 * func->u.s.FunctionLength - offset <= 4 * (epilogue_end - epilogue)) {
        /* Check epilogue */
        len = get_sequence_len( epilogue, epilogue_end, 1 );
        if (offset >= 2 * func->u.s.FunctionLength - len)
        {
            process_unwind_codes( epilogue, epilogue_end, context, ptrs, offset - (2 * func->u.s.FunctionLength - len) );
            return NULL;
        }
    }

    /* Execute full prologue */
    process_unwind_codes( prologue, prologue_end, context, ptrs, 0 );

    return NULL;
}


/***********************************************************************
 *           unwind_full_data
 */
static void *unwind_full_data( ULONG_PTR base, ULONG_PTR pc, RUNTIME_FUNCTION *func,
                               CONTEXT *context, PVOID *handler_data, KNONVOLATILE_CONTEXT_POINTERS *ptrs )
{
    struct unwind_info *info;
    struct unwind_info_epilog *info_epilog;
    unsigned int i, codes, epilogs, len, offset;
    void *data;
    BYTE *end;

    info = (struct unwind_info *)((char *)base + func->u.UnwindData);
    data = info + 1;
    epilogs = info->epilog;
    codes = info->codes;
    if (!codes && !epilogs)
    {
        struct unwind_info_ext *infoex = data;
        codes = infoex->codes;
        epilogs = infoex->epilog;
        data = infoex + 1;
    }
    info_epilog = data;
    if (!info->e) data = info_epilog + epilogs;

    offset = (pc - base) - func->BeginAddress;
    end = (BYTE *)data + codes * 4;

    TRACE( "function %lx-%lx: len=%#x ver=%u X=%u E=%u F=%u epilogs=%u codes=%u\n",
           base + func->BeginAddress, base + func->BeginAddress + info->function_length * 4,
           info->function_length, info->version, info->x, info->e, info->f, epilogs, codes * 4 );

    /* check for prolog */
    if (offset < codes * 4 * 4 && !info->f)
    {
        len = get_sequence_len( data, end, 0 );
        if (offset < len)
        {
            process_unwind_codes( data, end, context, ptrs, len - offset );
            return NULL;
        }
    }

    /* check for epilog */
    if (!info->e)
    {
        for (i = 0; i < epilogs; i++)
        {
            /* TODO: Currently not checking epilogue conditions. */
            if (offset < 2 * info_epilog[i].offset) break;
            if (offset - 2 * info_epilog[i].offset < (codes * 4 - info_epilog[i].index) * 4)
            {
                BYTE *ptr = (BYTE *)data + info_epilog[i].index;
                len = get_sequence_len( ptr, end, 1 );
                if (offset <= 2 * info_epilog[i].offset + len)
                {
                    process_unwind_codes( ptr, end, context, ptrs, offset - 2 * info_epilog[i].offset );
                    return NULL;
                }
            }
        }
    }
    else if (2 * info->function_length - offset <= (codes * 4 - epilogs) * 4)
    {
        BYTE *ptr = (BYTE *)data + epilogs;
        len = get_sequence_len( ptr, end, 1 );
        if (offset >= 2 * info->function_length - len)
        {
            process_unwind_codes( ptr, end, context, ptrs, offset - (2 * info->function_length - len) );
            return NULL;
        }
    }

    process_unwind_codes( data, end, context, ptrs, 0 );

    /* get handler since we are inside the main code */
    if (info->x)
    {
        DWORD *handler_rva = (DWORD *)data + codes;
        *handler_data = handler_rva + 1;
        return (char *)base + *handler_rva;
    }
    return NULL;
}

/***********************************************************************
 *            RtlVirtualUnwind  (NTDLL.@)
 */
PVOID WINAPI RtlVirtualUnwind( ULONG type, ULONG_PTR base, ULONG_PTR pc,
                               RUNTIME_FUNCTION *func, CONTEXT *context,
                               PVOID *handler_data, ULONG_PTR *frame_ret,
                               KNONVOLATILE_CONTEXT_POINTERS *ctx_ptr )
{
    void *handler;

    TRACE( "type %x pc %lx sp %x func %lx\n", type, pc, context->Sp, base + func->BeginAddress );

    *handler_data = NULL;

    context->Pc = 0;
    if (func->u.s.Flag)
        handler = unwind_packed_data( base, pc, func, context, ctx_ptr );
    else
        handler = unwind_full_data( base, pc, func, context, handler_data, ctx_ptr );

    TRACE( "ret: lr=%x sp=%x handler=%p\n", context->Lr, context->Sp, handler );
    if (!context->Pc)
        context->Pc = context->Lr;
    context->ContextFlags |= CONTEXT_UNWOUND_TO_CALL;
    *frame_ret = context->Sp;
    return handler;
}


/**********************************************************************
 *           call_consolidate_callback
 *
 * Wrapper function to call a consolidate callback from a fake frame.
 * If the callback executes RtlUnwindEx (like for example done in C++ handlers),
 * we have to skip all frames which were already processed. To do that we
 * trick the unwinding functions into thinking the call came from somewhere
 * else. All CFI instructions are either DW_CFA_def_cfa_expression or
 * DW_CFA_expression, and the expressions have the following format:
 *
 * DW_OP_breg13; sleb128 <OFFSET>       | Load SP + struct member offset
 * [DW_OP_deref]                        | Dereference, only for CFA
 */
extern void * WINAPI call_consolidate_callback( CONTEXT *context,
                                                void *(CALLBACK *callback)(EXCEPTION_RECORD *),
                                                EXCEPTION_RECORD *rec );
__ASM_GLOBAL_FUNC( call_consolidate_callback,
                   "push {r0-r2,lr}\n\t"
                   "sub sp, sp, #0x1a0\n\t"
                   "mov r1, r0\n\t"
                   "mov r0, sp\n\t"
                   "mov r2, #0x1a0\n\t"
                   "bl " __ASM_NAME("memcpy") "\n\t"
                   __ASM_CFI(".cfi_def_cfa 13, 0\n\t")
                   __ASM_CFI(".cfi_escape 0x0f,0x04,0x7d,0xb8,0x00,0x06\n\t") /* DW_CFA_def_cfa_expression: DW_OP_breg13 + 56, DW_OP_deref */
                   __ASM_CFI(".cfi_escape 0x10,0x04,0x02,0x7d,0x14\n\t") /* DW_CFA_expression: R4 DW_OP_breg13 + 20 */
                   __ASM_CFI(".cfi_escape 0x10,0x05,0x02,0x7d,0x18\n\t") /* DW_CFA_expression: R5 DW_OP_breg13 + 24 */
                   __ASM_CFI(".cfi_escape 0x10,0x06,0x02,0x7d,0x1c\n\t") /* DW_CFA_expression: R6 DW_OP_breg13 + 28 */
                   __ASM_CFI(".cfi_escape 0x10,0x07,0x02,0x7d,0x20\n\t") /* DW_CFA_expression: R7 DW_OP_breg13 + 32 */
                   __ASM_CFI(".cfi_escape 0x10,0x08,0x02,0x7d,0x24\n\t") /* DW_CFA_expression: R8 DW_OP_breg13 + 36 */
                   __ASM_CFI(".cfi_escape 0x10,0x09,0x02,0x7d,0x28\n\t") /* DW_CFA_expression: R9 DW_OP_breg13 + 40 */
                   __ASM_CFI(".cfi_escape 0x10,0x0a,0x02,0x7d,0x2c\n\t") /* DW_CFA_expression: R10 DW_OP_breg13 + 44 */
                   __ASM_CFI(".cfi_escape 0x10,0x0b,0x02,0x7d,0x30\n\t") /* DW_CFA_expression: R11 DW_OP_breg13 + 48 */
                   __ASM_CFI(".cfi_escape 0x10,0x0e,0x03,0x7d,0xc0,0x00\n\t") /* DW_CFA_expression: LR DW_OP_breg13 + 64 (PC) */
                   /* Libunwind doesn't support the registers D8-D15 like this */
#if 0
                   __ASM_CFI(".cfi_escape 0x10,0x88,0x02,0x03,0x7d,0x90,0x01\n\t") /* DW_CFA_expression: D8 DW_OP_breg13 + 144 */
                   __ASM_CFI(".cfi_escape 0x10,0x89,0x02,0x03,0x7d,0x98,0x01\n\t") /* DW_CFA_expression: D9 DW_OP_breg13 + 152 */
                   __ASM_CFI(".cfi_escape 0x10,0x8a,0x02,0x03,0x7d,0xa0,0x01\n\t") /* DW_CFA_expression: D10 DW_OP_breg13 + 160 */
                   __ASM_CFI(".cfi_escape 0x10,0x8b,0x02,0x03,0x7d,0xa8,0x01\n\t") /* DW_CFA_expression: D11 DW_OP_breg13 + 168 */
                   __ASM_CFI(".cfi_escape 0x10,0x8c,0x02,0x03,0x7d,0xb0,0x01\n\t") /* DW_CFA_expression: D12 DW_OP_breg13 + 176 */
                   __ASM_CFI(".cfi_escape 0x10,0x8d,0x02,0x03,0x7d,0xb8,0x01\n\t") /* DW_CFA_expression: D13 DW_OP_breg13 + 184 */
                   __ASM_CFI(".cfi_escape 0x10,0x8e,0x02,0x03,0x7d,0xc0,0x01\n\t") /* DW_CFA_expression: D14 DW_OP_breg13 + 192 */
                   __ASM_CFI(".cfi_escape 0x10,0x8f,0x02,0x03,0x7d,0xc8,0x01\n\t") /* DW_CFA_expression: D15 DW_OP_breg13 + 200 */
#endif
                   "ldrd r1, r2, [sp, #0x1a4]\n\t"
                   "mov r0, r2\n\t"
                   "blx r1\n\t"
                   "add sp, sp, #0x1ac\n\t"
                   "pop {pc}\n\t")



/*******************************************************************
 *              RtlRestoreContext (NTDLL.@)
 */
void CDECL RtlRestoreContext( CONTEXT *context, EXCEPTION_RECORD *rec )
{
    EXCEPTION_REGISTRATION_RECORD *teb_frame = NtCurrentTeb()->Tib.ExceptionList;

    if (rec && rec->ExceptionCode == STATUS_LONGJUMP && rec->NumberParameters >= 1)
    {
        struct MSVCRT_JUMP_BUFFER *jmp = (struct MSVCRT_JUMP_BUFFER *)rec->ExceptionInformation[0];
        int i;

        for (i = 4; i <= 11; i++)
            (&context->R4)[i-4] = (&jmp->R4)[i-4];
        context->Lr      = jmp->Pc;
        context->Sp      = jmp->Sp;
        context->Fpscr   = jmp->Fpscr;

        for (i = 0; i < 8; i++)
            context->u.D[8+i] = jmp->D[i];
    }
    else if (rec && rec->ExceptionCode == STATUS_UNWIND_CONSOLIDATE && rec->NumberParameters >= 1)
    {
        PVOID (CALLBACK *consolidate)(EXCEPTION_RECORD *) = (void *)rec->ExceptionInformation[0];
        TRACE( "calling consolidate callback %p (rec=%p)\n", consolidate, rec );
        rec->ExceptionInformation[10] = (ULONG_PTR)&context->R4;

        context->Pc = (DWORD)call_consolidate_callback( context, consolidate, rec );
    }

    /* hack: remove no longer accessible TEB frames */
    while ((DWORD)teb_frame < context->Sp)
    {
        TRACE( "removing TEB frame: %p\n", teb_frame );
        teb_frame = __wine_pop_frame( teb_frame );
    }

    TRACE( "returning to %x stack %x\n", context->Pc, context->Sp );
    NtContinue( context, FALSE );
}


/***********************************************************************
 *            RtlUnwindEx  (NTDLL.@)
 */
void WINAPI RtlUnwindEx( PVOID end_frame, PVOID target_ip, EXCEPTION_RECORD *rec,
                         PVOID retval, CONTEXT *context, UNWIND_HISTORY_TABLE *table )
{
    EXCEPTION_REGISTRATION_RECORD *teb_frame = NtCurrentTeb()->Tib.ExceptionList;
    EXCEPTION_RECORD record;
    DISPATCHER_CONTEXT dispatch;
    CONTEXT new_context;
    NTSTATUS status;
    DWORD i;

    RtlCaptureContext( context );
    new_context = *context;

    /* build an exception record, if we do not have one */
    if (!rec)
    {
        record.ExceptionCode    = STATUS_UNWIND;
        record.ExceptionFlags   = 0;
        record.ExceptionRecord  = NULL;
        record.ExceptionAddress = (void *)context->Pc;
        record.NumberParameters = 0;
        rec = &record;
    }

    rec->ExceptionFlags |= EH_UNWINDING | (end_frame ? 0 : EH_EXIT_UNWIND);

    TRACE( "code=%x flags=%x end_frame=%p target_ip=%p pc=%08x\n",
           rec->ExceptionCode, rec->ExceptionFlags, end_frame, target_ip, context->Pc );
    for (i = 0; i < min( EXCEPTION_MAXIMUM_PARAMETERS, rec->NumberParameters ); i++)
        TRACE( " info[%d]=%016lx\n", i, rec->ExceptionInformation[i] );
    TRACE("  r0=%08x  r1=%08x  r2=%08x  r3=%08x\n",
          context->R0, context->R1, context->R2, context->R3 );
    TRACE("  r4=%08x  r5=%08x  r6=%08x  r7=%08x\n",
          context->R4, context->R5, context->R6, context->R7 );
    TRACE("  r8=%08x  r9=%08x r10=%08x r11=%08x\n",
          context->R8, context->R9, context->R10, context->R11 );
    TRACE(" r12=%08x  sp=%08x  lr=%08x  pc=%08x\n",
          context->R12, context->Sp, context->Lr, context->Pc );

    dispatch.TargetPc         = (ULONG_PTR)target_ip;
    dispatch.ContextRecord    = context;
    dispatch.HistoryTable     = table;
    dispatch.NonVolatileRegisters = (BYTE *)&context->R4;

    for (;;)
    {
        status = virtual_unwind( UNW_FLAG_UHANDLER, &dispatch, &new_context );
        if (status != STATUS_SUCCESS) raise_status( status, rec );

    unwind_done:
        if (!dispatch.EstablisherFrame) break;

        if (!is_valid_frame( dispatch.EstablisherFrame ))
        {
            ERR( "invalid frame %x (%p-%p)\n", dispatch.EstablisherFrame,
                 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
            rec->ExceptionFlags |= EH_STACK_INVALID;
            break;
        }

        if (dispatch.LanguageHandler)
        {
            if (end_frame && (dispatch.EstablisherFrame > (DWORD)end_frame))
            {
                ERR( "invalid end frame %x/%p\n", dispatch.EstablisherFrame, end_frame );
                raise_status( STATUS_INVALID_UNWIND_TARGET, rec );
            }
            if (dispatch.EstablisherFrame == (DWORD)end_frame) rec->ExceptionFlags |= EH_TARGET_UNWIND;
            if (call_unwind_handler( rec, &dispatch ) == ExceptionCollidedUnwind)
            {
                ULONG_PTR frame;

                *context = new_context = *dispatch.ContextRecord;
                dispatch.ContextRecord = context;
                RtlVirtualUnwind( UNW_FLAG_NHANDLER, dispatch.ImageBase,
                                  dispatch.ControlPc, dispatch.FunctionEntry,
                                  &new_context, &dispatch.HandlerData, &frame,
                                  NULL );
                rec->ExceptionFlags |= EH_COLLIDED_UNWIND;
                goto unwind_done;
            }
            rec->ExceptionFlags &= ~EH_COLLIDED_UNWIND;
        }
        else  /* hack: call builtin handlers registered in the tib list */
        {
            DWORD64 backup_frame = dispatch.EstablisherFrame;
            while ((DWORD)teb_frame < new_context.Sp && (DWORD)teb_frame < (DWORD)end_frame)
            {
                TRACE( "found builtin frame %p handler %p\n", teb_frame, teb_frame->Handler );
                dispatch.EstablisherFrame = (DWORD)teb_frame;
                if (call_teb_unwind_handler( rec, &dispatch, teb_frame ) == ExceptionCollidedUnwind)
                {
                    ULONG_PTR frame;

                    teb_frame = __wine_pop_frame( teb_frame );

                    *context = new_context = *dispatch.ContextRecord;
                    dispatch.ContextRecord = context;
                    RtlVirtualUnwind( UNW_FLAG_NHANDLER, dispatch.ImageBase,
                                      dispatch.ControlPc, dispatch.FunctionEntry,
                                      &new_context, &dispatch.HandlerData,
                                      &frame, NULL );
                    rec->ExceptionFlags |= EH_COLLIDED_UNWIND;
                    goto unwind_done;
                }
                teb_frame = __wine_pop_frame( teb_frame );
            }
            if ((DWORD)teb_frame == (DWORD)end_frame && (DWORD)end_frame < new_context.Sp) break;
            dispatch.EstablisherFrame = backup_frame;
        }

        if (dispatch.EstablisherFrame == (DWORD)end_frame) break;
        *context = new_context;
    }

    context->R0     = (DWORD)retval;
    context->Pc     = (DWORD)target_ip;
    RtlRestoreContext(context, rec);
}


/***********************************************************************
 *            RtlUnwind  (NTDLL.@)
 */
void WINAPI RtlUnwind( void *frame, void *target_ip, EXCEPTION_RECORD *rec, void *retval )
{
    CONTEXT context;
    RtlUnwindEx( frame, target_ip, rec, retval, &context, NULL );
}


/*******************************************************************
 *		__jump_unwind (NTDLL.@)
 */
void WINAPI __jump_unwind( void *frame, void *target_ip )
{
    CONTEXT context;
    RtlUnwindEx( frame, target_ip, NULL, NULL, &context, NULL );
}

extern LONG __C_ExecuteExceptionFilter(PEXCEPTION_POINTERS ptrs, PVOID frame,
                                       PEXCEPTION_FILTER filter,
                                       PUCHAR nonvolatile);
__ASM_GLOBAL_FUNC( __C_ExecuteExceptionFilter,
                   "push {r4-r11,lr}\n\t"

                   __ASM_CFI(".cfi_def_cfa 13, 36\n\t")
                   __ASM_CFI(".cfi_offset r4, -36\n\t")
                   __ASM_CFI(".cfi_offset r5, -32\n\t")
                   __ASM_CFI(".cfi_offset r6, -28\n\t")
                   __ASM_CFI(".cfi_offset r7, -24\n\t")
                   __ASM_CFI(".cfi_offset r8, -20\n\t")
                   __ASM_CFI(".cfi_offset r9, -16\n\t")
                   __ASM_CFI(".cfi_offset r10, -12\n\t")
                   __ASM_CFI(".cfi_offset r11, -8\n\t")
                   __ASM_CFI(".cfi_offset lr, -4\n\t")

                   "ldm r3, {r4-r11,lr}\n\t"
                   "blx r2\n\t"
                   "pop {r4-r11,pc}\n\t" )

extern void __C_ExecuteTerminationHandler(BOOL abnormal, PVOID frame,
                                          PTERMINATION_HANDLER handler,
                                          PUCHAR nonvolatile);
/* This is, implementation wise, identical to __C_ExecuteExceptionFilter. */
__ASM_GLOBAL_FUNC( __C_ExecuteTerminationHandler,
                   "b " __ASM_NAME("__C_ExecuteExceptionFilter") "\n\t");

/*******************************************************************
 *              __C_specific_handler (NTDLL.@)
 */
EXCEPTION_DISPOSITION WINAPI __C_specific_handler( EXCEPTION_RECORD *rec,
                                                   void *frame,
                                                   CONTEXT *context,
                                                   struct _DISPATCHER_CONTEXT *dispatch )
{
    SCOPE_TABLE *table = dispatch->HandlerData;
    ULONG i;
    DWORD64 ControlPc = dispatch->ControlPc;

    TRACE( "%p %p %p %p\n", rec, frame, context, dispatch );
    if (TRACE_ON(seh)) dump_scope_table( dispatch->ImageBase, table );

    if (dispatch->ControlPcIsUnwound)
        ControlPc -= 2;

    if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
    {
        for (i = dispatch->ScopeIndex; i < table->Count; i++)
        {
            if (ControlPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
                ControlPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
            {
                PTERMINATION_HANDLER handler;

                if (table->ScopeRecord[i].JumpTarget) continue;

                if (rec->ExceptionFlags & EH_TARGET_UNWIND &&
                    dispatch->TargetPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
                    dispatch->TargetPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
                {
                    break;
                }

                handler = (PTERMINATION_HANDLER)(dispatch->ImageBase + table->ScopeRecord[i].HandlerAddress);
                dispatch->ScopeIndex = i+1;

                TRACE( "calling __finally %p frame %p\n", handler, frame );
                __C_ExecuteTerminationHandler( TRUE, frame, handler,
                                               dispatch->NonVolatileRegisters );
            }
        }
        return ExceptionContinueSearch;
    }

    for (i = dispatch->ScopeIndex; i < table->Count; i++)
    {
        if (ControlPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
            ControlPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
        {
            if (!table->ScopeRecord[i].JumpTarget) continue;
            if (table->ScopeRecord[i].HandlerAddress != EXCEPTION_EXECUTE_HANDLER)
            {
                EXCEPTION_POINTERS ptrs;
                PEXCEPTION_FILTER filter;

                filter = (PEXCEPTION_FILTER)(dispatch->ImageBase + table->ScopeRecord[i].HandlerAddress);
                ptrs.ExceptionRecord = rec;
                ptrs.ContextRecord = context;
                TRACE( "calling filter %p ptrs %p frame %p\n", filter, &ptrs, frame );
                switch (__C_ExecuteExceptionFilter( &ptrs, frame, filter,
                                                    dispatch->NonVolatileRegisters ))
                {
                case EXCEPTION_EXECUTE_HANDLER:
                    break;
                case EXCEPTION_CONTINUE_SEARCH:
                    continue;
                case EXCEPTION_CONTINUE_EXECUTION:
                    return ExceptionContinueExecution;
                }
            }
            TRACE( "unwinding to target %lx\n", dispatch->ImageBase + table->ScopeRecord[i].JumpTarget );
            RtlUnwindEx( frame, (char *)dispatch->ImageBase + table->ScopeRecord[i].JumpTarget,
                         rec, 0, dispatch->ContextRecord, dispatch->HistoryTable );
        }
    }
    return ExceptionContinueSearch;
}


/***********************************************************************
 *		RtlRaiseException (NTDLL.@)
 */
__ASM_STDCALL_FUNC( RtlRaiseException, 4,
                    "push {r0, lr}\n\t"
                    "sub sp, sp, #0x1a0\n\t"  /* sizeof(CONTEXT) */
                    __ASM_CFI(".cfi_adjust_cfa_offset 424\n\t")
                    __ASM_CFI(".cfi_offset lr, -4\n\t")
                    "mov r0, sp\n\t"  /* context */
                    "bl " __ASM_NAME("RtlCaptureContext") "\n\t"
                    "ldr r0, [sp, #0x1a0]\n\t" /* rec */
                    "ldr r1, [sp, #0x1a4]\n\t"
                    "str r1, [sp, #0x3c]\n\t"  /* context->Lr */
                    "str r1, [sp, #0x40]\n\t"  /* context->Pc */
                    "mrs r2, CPSR\n\t"
                    "bfi r2, r1, #5, #1\n\t"   /* Thumb bit */
                    "str r2, [sp, #0x44]\n\t"  /* context->Cpsr */
                    "str r1, [r0, #12]\n\t"    /* rec->ExceptionAddress */
                    "add r1, sp, #0x1a8\n\t"
                    "str r1, [sp, #0x38]\n\t"  /* context->Sp */
                    "mov r1, sp\n\t"
                    "mov r2, #1\n\t"
                    "bl " __ASM_NAME("NtRaiseException") "\n\t"
                    "bl " __ASM_NAME("RtlRaiseStatus") )

/*************************************************************************
 *             RtlCaptureStackBackTrace (NTDLL.@)
 */
USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
{
    FIXME( "(%d, %d, %p, %p) stub!\n", skip, count, buffer, hash );
    return 0;
}

/***********************************************************************
 *           signal_start_thread
 */
__ASM_GLOBAL_FUNC( signal_start_thread,
                   "mov sp, r0\n\t"  /* context */
                   "mov r1, #1\n\t"
                   "b " __ASM_NAME("NtContinue") )

/**********************************************************************
 *              DbgBreakPoint   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "udf #0xfe; bx lr; nop; nop; nop; nop" );

/**********************************************************************
 *              DbgUserBreakPoint   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "udf #0xfe; bx lr; nop; nop; nop; nop" );

#endif  /* __arm__ */