/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2021 Cadence Design Systems Inc. */

#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
#define _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H

/*
 *  System call like services offered by the simulator host.
 */

#define SYS_nop         0       /* unused */
#define SYS_exit        1       /*x*/
#define SYS_fork        2
#define SYS_read        3       /*x*/
#define SYS_write       4       /*x*/
#define SYS_open        5       /*x*/
#define SYS_close       6       /*x*/
#define SYS_rename      7       /*x 38 - waitpid */
#define SYS_creat       8       /*x*/
#define SYS_link        9       /*x (not implemented on WIN32) */
#define SYS_unlink      10      /*x*/
#define SYS_execv       11      /* n/a - execve */
#define SYS_execve      12      /* 11 - chdir */
#define SYS_pipe        13      /* 42 - time */
#define SYS_stat        14      /* 106 - mknod */
#define SYS_chmod       15
#define SYS_chown       16      /* 202 - lchown */
#define SYS_utime       17      /* 30 - break */
#define SYS_wait        18      /* n/a - oldstat */
#define SYS_lseek       19      /*x*/
#define SYS_getpid      20
#define SYS_isatty      21      /* n/a - mount */
#define SYS_fstat       22      /* 108 - oldumount */
#define SYS_time        23      /* 13 - setuid */
#define SYS_gettimeofday 24     /*x 78 - getuid (not implemented on WIN32) */
#define SYS_times       25      /*X 43 - stime (Xtensa-specific implementation) */
#define SYS_socket      26
#define SYS_sendto      27
#define SYS_recvfrom    28
#define SYS_select_one  29      /* not compatible select, one file descriptor at the time */
#define SYS_bind        30
#define SYS_ioctl       31

#define SYS_iss_argc    1000    /* returns value of argc */
#define SYS_iss_argv_size 1001  /* bytes needed for argv & arg strings */
#define SYS_iss_set_argv 1002   /* saves argv & arg strings at given addr */

/*
 * SYS_select_one specifiers
 */

#define  XTISS_SELECT_ONE_READ    1
#define  XTISS_SELECT_ONE_WRITE   2
#define  XTISS_SELECT_ONE_EXCEPT  3

static int errno;

static inline int __simc(int a, int b, int c, int d)
{
        register int a1 asm("a2") = a;
        register int b1 asm("a3") = b;
        register int c1 asm("a4") = c;
        register int d1 asm("a5") = d;
        __asm__ __volatile__ (
                        "simcall\n"
                        : "+r"(a1), "+r"(b1)
                        : "r"(c1), "r"(d1)
                        : "memory");
        errno = b1;
        return a1;
}

#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H */