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/*

 * Lattice Mico32 system calls.

 * Contributed by Jon Beniston 

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

#include 

/*

 * System call convention (as implemented in simulator:

 *    - System call number in register r8

 *    - Return value in r1 and r2 (only if 64-bit value)

 *    - errno in r3

 */

        .extern errno

        .global _write

_write:

        mvi     r8, SYS_write

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _read

_read:

        mvi     r8, SYS_read

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _open

_open:

        mvi     r8, SYS_open

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _close

_close:

        mvi     r8, SYS_close

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _lseek

_lseek:

        mvi     r8, SYS_lseek

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _fstat

_fstat:

        mvi     r8, SYS_fstat

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _stat

_stat:

        mvi     r8, SYS_stat

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _link

_link:

        mvi     r8, SYS_link

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _unlink

_unlink:

        mvi     r8, SYS_unlink

        scall

        mvhi    r4, hi(errno)

        ori     r4, r4, lo(errno)

        sw      (r4+0), r3

        ret

        .global _exit

_exit:

        /* This call doesn't return */

        mvi     r8, SYS_exit

        scall