/*
 * NT threads support
 *
 * Copyright 1996, 2003 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
 */

#include <assert.h>
#include <stdarg.h>
#include <limits.h>
#include <sys/types.h>

#define NONAMELESSUNION
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
#include "ddk/wdm.h"
#include "wine/exception.h"

WINE_DECLARE_DEBUG_CHANNEL(relay);
WINE_DECLARE_DEBUG_CHANNEL(thread);

struct _KUSER_SHARED_DATA *user_shared_data = (void *)0x7ffe0000;


/***********************************************************************
 *		__wine_dbg_get_channel_flags  (NTDLL.@)
 *
 * Get the flags to use for a given channel, possibly setting them too in case of lazy init
 */
unsigned char __cdecl __wine_dbg_get_channel_flags( struct __wine_debug_channel *channel )
{
    return unix_funcs->dbg_get_channel_flags( channel );
}

/***********************************************************************
 *		__wine_dbg_strdup  (NTDLL.@)
 */
const char * __cdecl __wine_dbg_strdup( const char *str )
{
    return unix_funcs->dbg_strdup( str );
}

/***********************************************************************
 *		__wine_dbg_header  (NTDLL.@)
 */
int __cdecl __wine_dbg_header( enum __wine_debug_class cls, struct __wine_debug_channel *channel,
                               const char *function )
{
    return unix_funcs->dbg_header( cls, channel, function );
}

/***********************************************************************
 *		__wine_dbg_output  (NTDLL.@)
 */
int __cdecl __wine_dbg_output( const char *str )
{
    return unix_funcs->dbg_output( str );
}


/***********************************************************************
 *           RtlExitUserThread  (NTDLL.@)
 */
void WINAPI RtlExitUserThread( ULONG status )
{
    ULONG last;

    NtQueryInformationThread( GetCurrentThread(), ThreadAmILastThread, &last, sizeof(last), NULL );
    if (last) RtlExitUserProcess( status );
    LdrShutdownThread();
    for (;;) NtTerminateThread( GetCurrentThread(), status );
}


/***********************************************************************
 *           RtlUserThreadStart (NTDLL.@)
 */
#ifdef __i386__
__ASM_STDCALL_FUNC( RtlUserThreadStart, 8,
                   "movl %ebx,8(%esp)\n\t"  /* arg */
                   "movl %eax,4(%esp)\n\t"  /* entry */
                   "jmp " __ASM_NAME("call_thread_func") )

/* wrapper to call BaseThreadInitThunk */
extern void DECLSPEC_NORETURN call_thread_func_wrapper( void *thunk, PRTL_THREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC( call_thread_func_wrapper,
                  "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 $4,%esp\n\t"
                   "andl $~0xf,%esp\n\t"
                   "xorl %ecx,%ecx\n\t"
                   "movl 12(%ebp),%edx\n\t"
                   "movl 16(%ebp),%eax\n\t"
                   "movl %eax,(%esp)\n\t"
                   "call *8(%ebp)" )

void DECLSPEC_HIDDEN call_thread_func( PRTL_THREAD_START_ROUTINE entry, void *arg )
{
    __TRY
    {
        TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
        call_thread_func_wrapper( pBaseThreadInitThunk, entry, arg );
    }
    __EXCEPT(call_unhandled_exception_filter)
    {
        NtTerminateProcess( GetCurrentProcess(), GetExceptionCode() );
    }
    __ENDTRY
}

#else  /* __i386__ */

void WINAPI RtlUserThreadStart( PRTL_THREAD_START_ROUTINE entry, void *arg )
{
    __TRY
    {
        TRACE_(relay)( "\1Starting thread proc %p (arg=%p)\n", entry, arg );
        pBaseThreadInitThunk( 0, (LPTHREAD_START_ROUTINE)entry, arg );
    }
    __EXCEPT(call_unhandled_exception_filter)
    {
        NtTerminateProcess( GetCurrentProcess(), GetExceptionCode() );
    }
    __ENDTRY
}

#endif  /* __i386__ */


/***********************************************************************
 *              RtlCreateUserThread   (NTDLL.@)
 */
NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, SECURITY_DESCRIPTOR *descr,
                                     BOOLEAN suspended, PVOID stack_addr,
                                     SIZE_T stack_reserve, SIZE_T stack_commit,
                                     PRTL_THREAD_START_ROUTINE start, void *param,
                                     HANDLE *handle_ptr, CLIENT_ID *id )
{
    ULONG flags = suspended ? THREAD_CREATE_FLAGS_CREATE_SUSPENDED : 0;
    ULONG_PTR buffer[offsetof( PS_ATTRIBUTE_LIST, Attributes[2] ) / sizeof(ULONG_PTR)];
    PS_ATTRIBUTE_LIST *attr_list = (PS_ATTRIBUTE_LIST *)buffer;
    HANDLE handle, actctx;
    TEB *teb;
    ULONG ret;
    NTSTATUS status;
    CLIENT_ID client_id;
    OBJECT_ATTRIBUTES attr;

    attr_list->TotalLength = sizeof(buffer);
    attr_list->Attributes[0].Attribute    = PS_ATTRIBUTE_CLIENT_ID;
    attr_list->Attributes[0].Size         = sizeof(client_id);
    attr_list->Attributes[0].ValuePtr     = &client_id;
    attr_list->Attributes[0].ReturnLength = NULL;
    attr_list->Attributes[1].Attribute    = PS_ATTRIBUTE_TEB_ADDRESS;
    attr_list->Attributes[1].Size         = sizeof(teb);
    attr_list->Attributes[1].ValuePtr     = &teb;
    attr_list->Attributes[1].ReturnLength = NULL;

    InitializeObjectAttributes( &attr, NULL, 0, NULL, descr );

    RtlGetActiveActivationContext( &actctx );
    if (actctx) flags |= THREAD_CREATE_FLAGS_CREATE_SUSPENDED;

    status = NtCreateThreadEx( &handle, THREAD_ALL_ACCESS, &attr, process, start, param,
                               flags, 0, stack_commit, stack_reserve, attr_list );
    if (!status)
    {
        if (actctx)
        {
            ULONG_PTR cookie;
            RtlActivateActivationContextEx( 0, teb, actctx, &cookie );
            if (!suspended) NtResumeThread( handle, &ret );
        }
        if (id) *id = client_id;
        if (handle_ptr) *handle_ptr = handle;
        else NtClose( handle );
    }
    if (actctx) RtlReleaseActivationContext( actctx );
    return status;
}


/******************************************************************************
 *              RtlGetNtGlobalFlags   (NTDLL.@)
 */
ULONG WINAPI RtlGetNtGlobalFlags(void)
{
    return NtCurrentTeb()->Peb->NtGlobalFlag;
}


/******************************************************************************
 *              RtlPushFrame  (NTDLL.@)
 */
void WINAPI RtlPushFrame( TEB_ACTIVE_FRAME *frame )
{
    frame->Previous = NtCurrentTeb()->ActiveFrame;
    NtCurrentTeb()->ActiveFrame = frame;
}


/******************************************************************************
 *              RtlPopFrame  (NTDLL.@)
 */
void WINAPI RtlPopFrame( TEB_ACTIVE_FRAME *frame )
{
    NtCurrentTeb()->ActiveFrame = frame->Previous;
}


/******************************************************************************
 *              RtlGetFrame  (NTDLL.@)
 */
TEB_ACTIVE_FRAME * WINAPI RtlGetFrame(void)
{
    return NtCurrentTeb()->ActiveFrame;
}


/***********************************************************************
 * Fibers
 ***********************************************************************/


static GLOBAL_FLS_DATA fls_data;

static RTL_CRITICAL_SECTION fls_section;
static RTL_CRITICAL_SECTION_DEBUG fls_critsect_debug =
{
    0, 0, &fls_section,
    { &fls_critsect_debug.ProcessLocksList, &fls_critsect_debug.ProcessLocksList },
            0, 0, { (DWORD_PTR)(__FILE__ ": fls_section") }
};
static RTL_CRITICAL_SECTION fls_section = { &fls_critsect_debug, -1, 0, 0, 0, 0 };

#define MAX_FLS_DATA_COUNT 0xff0

void init_global_fls_data(void)
{
    InitializeListHead( &fls_data.fls_list_head );
}

static void lock_fls_data(void)
{
    RtlEnterCriticalSection( &fls_section );
}

static void unlock_fls_data(void)
{
    RtlLeaveCriticalSection( &fls_section );
}

static unsigned int fls_chunk_size( unsigned int chunk_index )
{
    return 0x10 << chunk_index;
}

static unsigned int fls_index_from_chunk_index( unsigned int chunk_index, unsigned int index )
{
    return 0x10 * ((1 << chunk_index) - 1) + index;
}

static unsigned int fls_chunk_index_from_index( unsigned int index, unsigned int *index_in_chunk )
{
    unsigned int chunk_index = 0;

    while (index >= fls_chunk_size( chunk_index ))
        index -= fls_chunk_size( chunk_index++ );

    *index_in_chunk = index;
    return chunk_index;
}

TEB_FLS_DATA *fls_alloc_data(void)
{
    TEB_FLS_DATA *fls;

    if (!(fls = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*fls) )))
        return NULL;

    lock_fls_data();
    InsertTailList( &fls_data.fls_list_head, &fls->fls_list_entry );
    unlock_fls_data();

    return fls;
}


/***********************************************************************
 *              RtlFlsAlloc  (NTDLL.@)
 */
NTSTATUS WINAPI DECLSPEC_HOTPATCH RtlFlsAlloc( PFLS_CALLBACK_FUNCTION callback, ULONG *ret_index )
{
    unsigned int chunk_index, index, i;
    FLS_INFO_CHUNK *chunk;
    TEB_FLS_DATA *fls;

    if (!(fls = NtCurrentTeb()->FlsSlots)
            && !(NtCurrentTeb()->FlsSlots = fls = fls_alloc_data()))
        return STATUS_NO_MEMORY;

    lock_fls_data();
    for (i = 0; i < ARRAY_SIZE(fls_data.fls_callback_chunks); ++i)
    {
        if (!fls_data.fls_callback_chunks[i] || fls_data.fls_callback_chunks[i]->count < fls_chunk_size( i ))
            break;
    }

    if ((chunk_index = i) == ARRAY_SIZE(fls_data.fls_callback_chunks))
    {
        unlock_fls_data();
        return STATUS_NO_MEMORY;
    }

    if ((chunk = fls_data.fls_callback_chunks[chunk_index]))
    {
        for (index = 0; index < fls_chunk_size( chunk_index ); ++index)
            if (!chunk->callbacks[index].callback)
                break;
        assert( index < fls_chunk_size( chunk_index ));
    }
    else
    {
        fls_data.fls_callback_chunks[chunk_index] = chunk = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY,
                offsetof(FLS_INFO_CHUNK, callbacks) + sizeof(*chunk->callbacks) * fls_chunk_size( chunk_index ));
        if (!chunk)
        {
            unlock_fls_data();
            return STATUS_NO_MEMORY;
        }

        if (chunk_index)
        {
            index = 0;
        }
        else
        {
            chunk->count = 1; /* FLS index 0 is prohibited. */
            chunk->callbacks[0].callback = (void *)~(ULONG_PTR)0;
            index = 1;
        }
    }

    ++chunk->count;
    chunk->callbacks[index].callback = callback ? callback : (PFLS_CALLBACK_FUNCTION)~(ULONG_PTR)0;

    if ((*ret_index = fls_index_from_chunk_index( chunk_index, index )) > fls_data.fls_high_index)
        fls_data.fls_high_index = *ret_index;

    unlock_fls_data();

    return STATUS_SUCCESS;
}


/***********************************************************************
 *              RtlFlsFree   (NTDLL.@)
 */
NTSTATUS WINAPI DECLSPEC_HOTPATCH RtlFlsFree( ULONG index )
{
    PFLS_CALLBACK_FUNCTION callback;
    unsigned int chunk_index, idx;
    FLS_INFO_CHUNK *chunk;
    LIST_ENTRY *entry;

    lock_fls_data();

    if (!index || index > fls_data.fls_high_index)
    {
        unlock_fls_data();
        return STATUS_INVALID_PARAMETER;
    }

    chunk_index = fls_chunk_index_from_index( index, &idx );
    if (!(chunk = fls_data.fls_callback_chunks[chunk_index])
            || !(callback = chunk->callbacks[idx].callback))
    {
        unlock_fls_data();
        return STATUS_INVALID_PARAMETER;
    }

    for (entry = fls_data.fls_list_head.Flink; entry != &fls_data.fls_list_head; entry = entry->Flink)
    {
        TEB_FLS_DATA *fls = CONTAINING_RECORD(entry, TEB_FLS_DATA, fls_list_entry);

        if (fls->fls_data_chunks[chunk_index] && fls->fls_data_chunks[chunk_index][idx + 1])
        {
            if (callback != (void *)~(ULONG_PTR)0)
            {
                TRACE_(relay)("Calling FLS callback %p, arg %p.\n", callback,
                        fls->fls_data_chunks[chunk_index][idx + 1]);

                callback( fls->fls_data_chunks[chunk_index][idx + 1] );
            }
            fls->fls_data_chunks[chunk_index][idx + 1] = NULL;
        }
    }

    --chunk->count;
    chunk->callbacks[idx].callback = NULL;

    unlock_fls_data();
    return STATUS_SUCCESS;
}


/***********************************************************************
 *              RtlFlsSetValue (NTDLL.@)
 */
NTSTATUS WINAPI DECLSPEC_HOTPATCH RtlFlsSetValue( ULONG index, void *data )
{
    unsigned int chunk_index, idx;
    TEB_FLS_DATA *fls;

    if (!index || index >= MAX_FLS_DATA_COUNT)
        return STATUS_INVALID_PARAMETER;

    if (!(fls = NtCurrentTeb()->FlsSlots)
            && !(NtCurrentTeb()->FlsSlots = fls = fls_alloc_data()))
        return STATUS_NO_MEMORY;

    chunk_index = fls_chunk_index_from_index( index, &idx );

    if (!fls->fls_data_chunks[chunk_index] &&
            !(fls->fls_data_chunks[chunk_index] = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY,
            (fls_chunk_size( chunk_index ) + 1) * sizeof(*fls->fls_data_chunks[chunk_index]) )))
        return STATUS_NO_MEMORY;

    fls->fls_data_chunks[chunk_index][idx + 1] = data;

    return STATUS_SUCCESS;
}


/***********************************************************************
 *              RtlFlsGetValue (NTDLL.@)
 */
NTSTATUS WINAPI DECLSPEC_HOTPATCH RtlFlsGetValue( ULONG index, void **data )
{
    unsigned int chunk_index, idx;
    TEB_FLS_DATA *fls;

    if (!index || index >= MAX_FLS_DATA_COUNT || !(fls = NtCurrentTeb()->FlsSlots))
        return STATUS_INVALID_PARAMETER;

    chunk_index = fls_chunk_index_from_index( index, &idx );

    *data = fls->fls_data_chunks[chunk_index] ? fls->fls_data_chunks[chunk_index][idx + 1] : NULL;
    return STATUS_SUCCESS;
}


/***********************************************************************
 *              RtlProcessFlsData (NTDLL.@)
 */
void WINAPI DECLSPEC_HOTPATCH RtlProcessFlsData( void *teb_fls_data, ULONG flags )
{
    TEB_FLS_DATA *fls = teb_fls_data;
    unsigned int i, index;

    TRACE_(thread)( "teb_fls_data %p, flags %#x.\n", teb_fls_data, flags );

    if (flags & ~3)
        FIXME_(thread)( "Unknown flags %#x.\n", flags );

    if (!fls)
        return;

    if (flags & 1)
    {
        lock_fls_data();
        for (i = 0; i < ARRAY_SIZE(fls->fls_data_chunks); ++i)
        {
            if (!fls->fls_data_chunks[i] || !fls_data.fls_callback_chunks[i]
                    || !fls_data.fls_callback_chunks[i]->count)
                continue;

            for (index = 0; index < fls_chunk_size( i ); ++index)
            {
                PFLS_CALLBACK_FUNCTION callback = fls_data.fls_callback_chunks[i]->callbacks[index].callback;

                if (!fls->fls_data_chunks[i][index + 1])
                    continue;

                if (callback && callback != (void *)~(ULONG_PTR)0)
                {
                    TRACE_(relay)("Calling FLS callback %p, arg %p.\n", callback,
                            fls->fls_data_chunks[i][index + 1]);

                    callback( fls->fls_data_chunks[i][index + 1] );
                }
                fls->fls_data_chunks[i][index + 1] = NULL;
            }
        }
        /* Not using RemoveEntryList() as Windows does not zero list entry here. */
        fls->fls_list_entry.Flink->Blink = fls->fls_list_entry.Blink;
        fls->fls_list_entry.Blink->Flink = fls->fls_list_entry.Flink;
        unlock_fls_data();
    }

    if (flags & 2)
    {
        for (i = 0; i < ARRAY_SIZE(fls->fls_data_chunks); ++i)
            RtlFreeHeap( GetProcessHeap(), 0, fls->fls_data_chunks[i] );

        RtlFreeHeap( GetProcessHeap(), 0, fls );
    }
}
