/*

 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.

 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice, this list of

 *    conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright notice, this list

 *    of conditions and the following disclaimer in the documentation and/or other materials

 *    provided with the distribution.

 *

 * 3. Neither the name of the copyright holder nor the names of its contributors may be used

 *    to endorse or promote products derived from this software without specific prior written

 *    permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */



#define _GNU_SOURCE

#ifdef LOSCFG_FS_VFS

#include "fs/file.h"

#endif

#include "los_init.h"

#include "los_signal.h"

#include "los_syscall.h"

#include "los_task_pri.h"

#include "los_process_pri.h"

#include "los_hw_pri.h"

#include "los_printf.h"

#include "time.h"

#include "utime.h"

#include "poll.h"

#include "mqueue.h"

#include "los_futex_pri.h"

#include "sys/times.h"

#include "dirent.h"

#include "fcntl.h"

#include "unistd.h"



#include "sys/mount.h"

#include "sys/resource.h"

#include "sys/mman.h"

#include "sys/uio.h"

#include "sys/prctl.h"

#include "sys/socket.h"

#include "sys/utsname.h"

#ifdef LOSCFG_SHELL

#include "shmsg.h"

#endif

#ifdef LOSCFG_SECURITY_CAPABILITY

#include "capability_api.h"

#endif

#include "sys/shm.h"





#define SYS_CALL_NUM    (__NR_syscallend + 1)

#define NARG_BITS       4

#define NARG_MASK       0x0F

#define NARG_PER_BYTE   2



typedef UINT32 (*SyscallFun1)(UINT32);

typedef UINT32 (*SyscallFun3)(UINT32, UINT32, UINT32);

typedef UINT32 (*SyscallFun5)(UINT32, UINT32, UINT32, UINT32, UINT32);

typedef UINT32 (*SyscallFun7)(UINT32, UINT32, UINT32, UINT32, UINT32, UINT32, UINT32);



static UINTPTR g_syscallHandle[SYS_CALL_NUM] = {0};

static UINT8 g_syscallNArgs[(SYS_CALL_NUM + 1) / NARG_PER_BYTE] = {0};



void OsSyscallHandleInit(void)

{

#define SYSCALL_HAND_DEF(id, fun, rType, nArg)                                             \

    if ((id) < SYS_CALL_NUM) {                                                             \

        g_syscallHandle[(id)] = (UINTPTR)(fun);                                            \

        g_syscallNArgs[(id) / NARG_PER_BYTE] |= ((id) & 1) ? (nArg) << NARG_BITS : (nArg); \

    }                                                                                      \



    #include "syscall_lookup.h"

#undef SYSCALL_HAND_DEF

}



LOS_MODULE_INIT(OsSyscallHandleInit, LOS_INIT_LEVEL_KMOD_EXTENDED);



/* The SYSCALL ID is in R7 on entry.  Parameters follow in R0..R6 */

VOID OsArmA32SyscallHandle(TaskContext *regs)

{

    UINT32 ret;

    UINT8 nArgs;

    UINTPTR handle;

    UINT32 cmd = regs->reserved2;



    if (cmd >= SYS_CALL_NUM) {

        PRINT_ERR("Syscall ID: error %d !!!\n", cmd);

        return;

    }



    handle = g_syscallHandle[cmd];

    nArgs = g_syscallNArgs[cmd / NARG_PER_BYTE]; /* 4bit per nargs */

    nArgs = (cmd & 1) ? (nArgs >> NARG_BITS) : (nArgs & NARG_MASK);

    if ((handle == 0) || (nArgs > ARG_NUM_7)) {

        PRINT_ERR("Unsupported syscall ID: %d nArgs: %d\n", cmd, nArgs);

        regs->R0 = -ENOSYS;

        return;

    }



    OsSigIntLock();

    switch (nArgs) {

        case ARG_NUM_0:

        case ARG_NUM_1:

            ret = (*(SyscallFun1)handle)(regs->R0);

            break;

        case ARG_NUM_2:

        case ARG_NUM_3:

            ret = (*(SyscallFun3)handle)(regs->R0, regs->R1, regs->R2);

            break;

        case ARG_NUM_4:

        case ARG_NUM_5:

            ret = (*(SyscallFun5)handle)(regs->R0, regs->R1, regs->R2, regs->R3, regs->R4);

            break;

        default:

            ret = (*(SyscallFun7)handle)(regs->R0, regs->R1, regs->R2, regs->R3, regs->R4, regs->R5, regs->R6);

    }



    regs->R0 = ret;

    OsSigIntUnlock();



    return;

}