2018-03-12 04:23:26 +08:00
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/* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* syscalls.S -- PRU system calls code
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*
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* Copyright (c) 2018-2019 Dimitar Dimitrov <dimitar@dinux.eu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "newlib.h"
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#include "syscall.h"
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.extern _impure_ptr
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/* Handle return from syscall. */
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.global __SC_ret
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.type __SC_ret,@function
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.func
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__SC_ret:
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/* Check for negative return code */
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qbbc __SC_ret_skip_errno_set, r14, 31
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/* Invert return code and store to errno (first int in _impure_ptr). */
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rsb r14, r14, 0
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ldi32 r1, _impure_ptr
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2020-06-04 00:14:22 +08:00
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lbbo r1, r1, 0, 4
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2018-03-12 04:23:26 +08:00
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sbbo r14, r1, 0, 4
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/* Return -1 (for both int32_t or int64_t). */
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fill r14, 8
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__SC_ret_skip_errno_set:
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ret
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.endfunc
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.macro SC fname, id
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.global \fname
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.type \fname,@function
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.func
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\fname:
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ldi r1, \id
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halt
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jmp __SC_ret
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.endfunc
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.endm
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.text
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/* Syscalls are used only by simulator. Real HW
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users use other methods for communicating with
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the host - remoteproc, rpmsg, shared memory. */
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SC _exit, SYS_exit
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SC _open, SYS_open
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SC _close, SYS_close
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SC _read, SYS_read
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SC _write, SYS_write
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SC _lseek, SYS_lseek
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SC _unlink, SYS_unlink
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SC _getpid, SYS_getpid
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SC _kill, SYS_kill
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SC _fstat, SYS_fstat
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