/*
 * PowerPC signal handling routines
 *
 * Copyright 2002 Marcus Meissner, SuSE Linux AG
 *
 * 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 __powerpc__

#include "config.h"
#include "wine/port.h"

#include <assert.h>
#include <signal.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
#  include <sys/syscall.h>
# endif
#endif
#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#ifdef HAVE_SYS_UCONTEXT_H
# include <sys/ucontext.h>
#endif

#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"

WINE_DEFAULT_DEBUG_CHANNEL(seh);

/***********************************************************************
 * signal context platform-specific definitions
 */
#ifdef linux

/* All Registers access - only for local access */
# define REG_sig(reg_name, context)		((context)->uc_mcontext.regs->reg_name)


/* Gpr Registers access  */
# define GPR_sig(reg_num, context)		REG_sig(gpr[reg_num], context)

# define IAR_sig(context)			REG_sig(nip, context)	/* Program counter */
# define MSR_sig(context)			REG_sig(msr, context)   /* Machine State Register (Supervisor) */
# define CTR_sig(context)			REG_sig(ctr, context)   /* Count register */

# define XER_sig(context)			REG_sig(xer, context) /* User's integer exception register */
# define LR_sig(context)			REG_sig(link, context) /* Link register */
# define CR_sig(context)			REG_sig(ccr, context) /* Condition register */

/* Float Registers access  */
# define FLOAT_sig(reg_num, context)		(((double*)((char*)((context)->uc_mcontext.regs+48*4)))[reg_num])

# define FPSCR_sig(context)			(*(int*)((char*)((context)->uc_mcontext.regs+(48+32*2)*4)))

/* Exception Registers access */
# define DAR_sig(context)			REG_sig(dar, context)
# define DSISR_sig(context)			REG_sig(dsisr, context)
# define TRAP_sig(context)			REG_sig(trap, context)

#endif /* linux */

#ifdef __APPLE__

/* All Registers access - only for local access */
# define REG_sig(reg_name, context)		((context)->uc_mcontext->ss.reg_name)
# define FLOATREG_sig(reg_name, context)	((context)->uc_mcontext->fs.reg_name)
# define EXCEPREG_sig(reg_name, context)	((context)->uc_mcontext->es.reg_name)
# define VECREG_sig(reg_name, context)		((context)->uc_mcontext->vs.reg_name)

/* Gpr Registers access */
# define GPR_sig(reg_num, context)		REG_sig(r##reg_num, context)

# define IAR_sig(context)			REG_sig(srr0, context)	/* Program counter */
# define MSR_sig(context)			REG_sig(srr1, context)  /* Machine State Register (Supervisor) */
# define CTR_sig(context)			REG_sig(ctr, context)

# define XER_sig(context)			REG_sig(xer, context) /* Link register */
# define LR_sig(context)			REG_sig(lr, context)  /* User's integer exception register */
# define CR_sig(context)			REG_sig(cr, context)  /* Condition register */

/* Float Registers access */
# define FLOAT_sig(reg_num, context)		FLOATREG_sig(fpregs[reg_num], context)

# define FPSCR_sig(context)			FLOATREG_sig(fpscr, context)

/* Exception Registers access */
# define DAR_sig(context)			EXCEPREG_sig(dar, context)     /* Fault registers for coredump */
# define DSISR_sig(context)			EXCEPREG_sig(dsisr, context)
# define TRAP_sig(context)			EXCEPREG_sig(exception, context) /* number of powerpc exception taken */

/* Signal defs : Those are undefined on darwin
SIGBUS
#undef BUS_ADRERR
#undef BUS_OBJERR
SIGILL
#undef ILL_ILLOPN
#undef ILL_ILLTRP
#undef ILL_ILLADR
#undef ILL_COPROC
#undef ILL_PRVREG
#undef ILL_BADSTK
SIGTRAP
#undef TRAP_BRKPT
#undef TRAP_TRACE
SIGFPE
*/

#endif /* __APPLE__ */


/***********************************************************************
 *           save_context
 *
 * Set the register values from a sigcontext.
 */
static void save_context( CONTEXT *context, const ucontext_t *sigcontext )
{

#define C(x) context->Gpr##x = GPR_sig(x,sigcontext)
        /* Save Gpr registers */
	C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
	C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19); C(20);
	C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
	C(31);
#undef C

	context->Iar = IAR_sig(sigcontext);  /* Program Counter */
	context->Msr = MSR_sig(sigcontext);  /* Machine State Register (Supervisor) */
	context->Ctr = CTR_sig(sigcontext);
        
        context->Xer = XER_sig(sigcontext);
	context->Lr  = LR_sig(sigcontext);
	context->Cr  = CR_sig(sigcontext);
        
        /* Saving Exception regs */
        context->Dar   = DAR_sig(sigcontext);
        context->Dsisr = DSISR_sig(sigcontext);
        context->Trap  = TRAP_sig(sigcontext);
}


/***********************************************************************
 *           restore_context
 *
 * Build a sigcontext from the register values.
 */
static void restore_context( const CONTEXT *context, ucontext_t *sigcontext )
{

#define C(x)  GPR_sig(x,sigcontext) = context->Gpr##x
	C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
	C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19); C(20);
	C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
	C(31);
#undef C

        IAR_sig(sigcontext) = context->Iar;  /* Program Counter */
        MSR_sig(sigcontext) = context->Msr;  /* Machine State Register (Supervisor) */
        CTR_sig(sigcontext) = context->Ctr;
        
        XER_sig(sigcontext) = context->Xer;
        LR_sig(sigcontext) = context->Lr;
	CR_sig(sigcontext) = context->Cr;
        
        /* Setting Exception regs */
        DAR_sig(sigcontext) = context->Dar;
        DSISR_sig(sigcontext) = context->Dsisr;
        TRAP_sig(sigcontext) = context->Trap;
}


/***********************************************************************
 *           save_fpu
 *
 * Set the FPU context from a sigcontext.
 */
static inline void save_fpu( CONTEXT *context, const ucontext_t *sigcontext )
{
#define C(x)   context->Fpr##x = FLOAT_sig(x,sigcontext)
        C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
	C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19); C(20);
	C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
	C(31);
#undef C
        context->Fpscr = FPSCR_sig(sigcontext);
}


/***********************************************************************
 *           restore_fpu
 *
 * Restore the FPU context to a sigcontext.
 */
static inline void restore_fpu( CONTEXT *context, const ucontext_t *sigcontext )
{
#define C(x)  FLOAT_sig(x,sigcontext) = context->Fpr##x
        C(0); C(1); C(2); C(3); C(4); C(5); C(6); C(7); C(8); C(9); C(10);
	C(11); C(12); C(13); C(14); C(15); C(16); C(17); C(18); C(19); C(20);
	C(21); C(22); C(23); C(24); C(25); C(26); C(27); C(28); C(29); C(30);
	C(31);
#undef C
        FPSCR_sig(sigcontext) = context->Fpscr;
}


/***********************************************************************
 *		RtlCaptureContext (NTDLL.@)
 */
void WINAPI RtlCaptureContext( CONTEXT *context )
{
    FIXME("not implemented\n");
    memset( context, 0, sizeof(*context) );
}


/**********************************************************************
 *           call_stack_handlers
 *
 * Call the stack handlers chain.
 */
static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    EXCEPTION_POINTERS ptrs;

    FIXME( "not implemented on PowerPC\n" );

    /* hack: call unhandled exception filter directly */
    ptrs.ExceptionRecord = rec;
    ptrs.ContextRecord = context;
    call_unhandled_exception_filter( &ptrs );
    return STATUS_UNHANDLED_EXCEPTION;
}


/*******************************************************************
 *		raise_exception
 *
 * Implementation of NtRaiseException.
 */
static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
    NTSTATUS status;

    if (first_chance)
    {
        DWORD c;

        TRACE( "code=%x flags=%x addr=%p ip=%x tid=%04x\n",
               rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
               context->Iar, 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
        {
            /* FIXME: dump context */
        }

        status = send_debug_event( rec, TRUE, context );
        if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
            return STATUS_SUCCESS;

        if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
            return STATUS_SUCCESS;

        if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
            return status;
    }

    /* last chance exception */

    status = send_debug_event( rec, FALSE, context );
    if (status != DBG_CONTINUE)
    {
        if (rec->ExceptionFlags & EH_STACK_INVALID)
            ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
        else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
            ERR("Process attempted to continue execution after noncontinuable exception.\n");
        else
            ERR("Unhandled exception code %x flags %x addr %p\n",
                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
        NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
    }
    return STATUS_SUCCESS;
}


/*******************************************************************
 *		KiUserExceptionDispatcher (NTDLL.@)
 */
NTSTATUS WINAPI KiUserExceptionDispatcher( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    NTSTATUS status;
    DWORD c;

    TRACE( "code=%x flags=%x addr=%p ip=%x tid=%04x\n",
           rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
           context->Iar, 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
    {
        /* FIXME: dump context */
    }

    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 );
}


/**********************************************************************
 *		segv_handler
 *
 * Handler for SIGSEGV and related errors.
 */
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD rec;
    CONTEXT context;
    NTSTATUS status;

    save_context( &context, sigcontext );

    rec.ExceptionRecord  = NULL;
    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    rec.ExceptionAddress = (LPVOID)context.Iar;
    rec.NumberParameters = 0;

    switch (signal)
    {
    case SIGSEGV:
    	switch (siginfo->si_code & 0xffff)
        {
	case SEGV_MAPERR:
	case SEGV_ACCERR:
            rec.NumberParameters = 2;
            rec.ExceptionInformation[0] = 0; /* FIXME ? */
            rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
            if (!(rec.ExceptionCode = unix_funcs->virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0], FALSE)))
                goto done;
            break;
	default:
            FIXME("Unhandled SIGSEGV/%x\n",siginfo->si_code);
            break;
	}
    	break;
    case SIGBUS:
    	switch (siginfo->si_code & 0xffff)
        {
	case BUS_ADRALN:
            rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
            break;
#ifdef BUS_ADRERR
	case BUS_ADRERR:
#endif
#ifdef BUS_OBJERR
	case BUS_OBJERR:
            /* FIXME: correct for all cases ? */
            rec.NumberParameters = 2;
            rec.ExceptionInformation[0] = 0; /* FIXME ? */
            rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
            if (!(rec.ExceptionCode = unix_funcs->virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0], FALSE)))
                goto done;
            break;
#endif
	default:
            FIXME("Unhandled SIGBUS/%x\n",siginfo->si_code);
            break;
	}
    	break;
    case SIGILL:
    	switch (siginfo->si_code & 0xffff)
        {
	case ILL_ILLOPC: /* illegal opcode */
#ifdef ILL_ILLOPN
	case ILL_ILLOPN: /* illegal operand */
#endif
#ifdef ILL_ILLADR
	case ILL_ILLADR: /* illegal addressing mode */
#endif
#ifdef ILL_ILLTRP
	case ILL_ILLTRP: /* illegal trap */
#endif
#ifdef ILL_COPROC
	case ILL_COPROC: /* coprocessor error */
#endif
            rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
            break;
	case ILL_PRVOPC: /* privileged opcode */
#ifdef ILL_PRVREG
	case ILL_PRVREG: /* privileged register */
#endif
            rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
            break;
#ifdef ILL_BADSTK
	case ILL_BADSTK: /* internal stack error */
            rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
            break;
#endif
	default:
            FIXME("Unhandled SIGILL/%x\n", siginfo->si_code);
            break;
	}
    	break;
    }
    status = raise_exception( &rec, &context, TRUE );
    if (status) raise_status( status, &rec );
done:
    restore_context( &context, sigcontext );
}

/**********************************************************************
 *		trap_handler
 *
 * Handler for SIGTRAP.
 */
static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD rec;
    CONTEXT context;
    NTSTATUS status;

    save_context( &context, sigcontext );

    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    rec.ExceptionRecord  = NULL;
    rec.ExceptionAddress = (LPVOID)context.Iar;
    rec.NumberParameters = 0;

    /* FIXME: check if we might need to modify PC */
    switch (siginfo->si_code & 0xffff)
    {
#ifdef TRAP_BRKPT
    case TRAP_BRKPT:
        rec.ExceptionCode = EXCEPTION_BREAKPOINT;
    	break;
#endif
#ifdef TRAP_TRACE
    case TRAP_TRACE:
        rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
    	break;
#endif
    default:
        FIXME("Unhandled SIGTRAP/%x\n", siginfo->si_code);
        break;
    }
    status = raise_exception( &rec, &context, TRUE );
    if (status) raise_status( status, &rec );
    restore_context( &context, sigcontext );
}

/**********************************************************************
 *		fpe_handler
 *
 * Handler for SIGFPE.
 */
static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD rec;
    CONTEXT context;
    NTSTATUS status;

    save_fpu( &context, sigcontext );
    save_context( &context, sigcontext );

    switch (siginfo->si_code & 0xffff )
    {
#ifdef FPE_FLTSUB
    case FPE_FLTSUB:
        rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
        break;
#endif
#ifdef FPE_INTDIV
    case FPE_INTDIV:
        rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
        break;
#endif
#ifdef FPE_INTOVF
    case FPE_INTOVF:
        rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
        break;
#endif
#ifdef FPE_FLTDIV
    case FPE_FLTDIV:
        rec.ExceptionCode = EXCEPTION_FLT_DIVIDE_BY_ZERO;
        break;
#endif
#ifdef FPE_FLTOVF
    case FPE_FLTOVF:
        rec.ExceptionCode = EXCEPTION_FLT_OVERFLOW;
        break;
#endif
#ifdef FPE_FLTUND
    case FPE_FLTUND:
        rec.ExceptionCode = EXCEPTION_FLT_UNDERFLOW;
        break;
#endif
#ifdef FPE_FLTRES
    case FPE_FLTRES:
        rec.ExceptionCode = EXCEPTION_FLT_INEXACT_RESULT;
        break;
#endif
#ifdef FPE_FLTINV
    case FPE_FLTINV:
#endif
    default:
        rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
        break;
    }
    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    rec.ExceptionRecord  = NULL;
    rec.ExceptionAddress = (LPVOID)context.Iar;
    rec.NumberParameters = 0;
    status = raise_exception( &rec, &context, TRUE );
    if (status) raise_status( status, &rec );

    restore_context( &context, sigcontext );
    restore_fpu( &context, sigcontext );
}

/**********************************************************************
 *		int_handler
 *
 * Handler for SIGINT.
 */
static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD rec;
    CONTEXT context;
    NTSTATUS status;

    save_context( &context, sigcontext );
    rec.ExceptionCode    = CONTROL_C_EXIT;
    rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    rec.ExceptionRecord  = NULL;
    rec.ExceptionAddress = (LPVOID)context.Iar;
    rec.NumberParameters = 0;
    status = raise_exception( &rec, &context, TRUE );
    if (status) raise_status( status, &rec );
    restore_context( &context, sigcontext );
}


/**********************************************************************
 *		abrt_handler
 *
 * Handler for SIGABRT.
 */
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD rec;
    CONTEXT context;
    NTSTATUS status;

    save_context( &context, sigcontext );
    rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
    rec.ExceptionFlags   = EH_NONCONTINUABLE;
    rec.ExceptionRecord  = NULL;
    rec.ExceptionAddress = (LPVOID)context.Iar;
    rec.NumberParameters = 0;
    status = raise_exception( &rec, &context, TRUE );
    if (status) raise_status( status, &rec );
    restore_context( &context, sigcontext );
}


/**********************************************************************
 *		quit_handler
 *
 * Handler for SIGQUIT.
 */
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    unix_funcs->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;

    save_context( &context, sigcontext );
    wait_suspend( &context );
    restore_context( &context, sigcontext );
}


/**********************************************************************
 *		signal_init_process
 */
void signal_init_process(void)
{
    struct sigaction sig_act;

    sig_act.sa_mask = server_block_set;
    sig_act.sa_flags = SA_RESTART | SA_SIGINFO;

    sig_act.sa_sigaction = int_handler;
    if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = fpe_handler;
    if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = abrt_handler;
    if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = quit_handler;
    if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = usr1_handler;
    if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;

    sig_act.sa_sigaction = segv_handler;
    if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
    if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
#ifdef SIGBUS
    if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
#endif

#ifdef SIGTRAP
    sig_act.sa_sigaction = trap_handler;
    if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
#endif
    return;

 error:
    perror("sigaction");
    exit(1);
}


/***********************************************************************
 *            RtlUnwind  (NTDLL.@)
 */
void WINAPI RtlUnwind( PVOID pEndFrame, PVOID targetIp, PEXCEPTION_RECORD pRecord, PVOID retval )
{
    FIXME( "Not implemented on PowerPC\n" );
}

/***********************************************************************
 *		RtlRaiseException (NTDLL.@)
 */
void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
{
    CONTEXT context;
    NTSTATUS status;

    RtlCaptureContext( &context );
    rec->ExceptionAddress = (void *)context.Iar;
    status = raise_exception( rec, &context, TRUE );
    if (status) raise_status( status, rec );
}

/*************************************************************************
 *		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;
}

/**********************************************************************
 *              DbgBreakPoint   (NTDLL.@)
 */
void WINAPI DbgBreakPoint(void)
{
     kill(getpid(), SIGTRAP);
}

/**********************************************************************
 *              DbgUserBreakPoint   (NTDLL.@)
 */
void WINAPI DbgUserBreakPoint(void)
{
     kill(getpid(), SIGTRAP);
}

/**********************************************************************
 *           NtCurrentTeb   (NTDLL.@)
 */
TEB * WINAPI NtCurrentTeb(void)
{
    return unix_funcs->NtCurrentTeb();
}

#endif  /* __powerpc__ */