simcall.h

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/*
 * include/asm-xtensa/platform-iss/simcall.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 Tensilica Inc.
 */

#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_H
#define _XTENSA_PLATFORM_ISS_SIMCALL_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 compitible select, one file descriptor at the time */
#define SYS_bind        30
#define SYS_ioctl   31

/*
 * 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, int e, int f)
{
    int ret;
    register int a1 asm("a2") = a;
    register int b1 asm("a3") = b;
    register int c1 asm("a4") = c;
    register int d1 asm("a5") = d;
    register int e1 asm("a6") = e;
    register int f1 asm("a7") = f;
    __asm__ __volatile__ (
            "simcall\n"
            "mov %0, a2\n"
            "mov %1, a3\n"
            : "=a" (ret), "=a" (errno), "+r"(a1), "+r"(b1)
            : "r"(c1), "r"(d1), "r"(e1), "r"(f1)
            : );
    return ret;
}

static inline int simc_open(const char *file, int flags, int mode)
{
    wmb();
    return __simc(SYS_open, (int) file, flags, mode, 0, 0);
}

static inline int simc_close(int fd)
{
    return __simc(SYS_close, fd, 0, 0, 0, 0);
}

static inline int simc_ioctl(int fd, int request, void *arg)
{
    wmb();
    return __simc(SYS_ioctl, fd, request, (int) arg, 0, 0);
}

static inline int simc_read(int fd, void *buf, size_t count)
{
    rmb();
    return __simc(SYS_read, fd, (int) buf, count, 0, 0);
}

static inline int simc_write(int fd, const void *buf, size_t count)
{
    wmb();
    return __simc(SYS_write, fd, (int) buf, count, 0, 0);
}

static inline int simc_poll(int fd)
{
    struct timeval tv = { .tv_sec = 0, .tv_usec = 0 };

    wmb();
    return __simc(SYS_select_one, fd, XTISS_SELECT_ONE_READ, (int)&tv,
            0, 0);
}

#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_H */