lib/libc/riscv/SYS.h

   1 /*-
   2  * Copyright (c) 2014 Andrew Turner
   3  * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
   4  * All rights reserved.
   5  *
   6  * Portions of this software were developed by SRI International and the
   7  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
   8  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
   9  *
  10  * Portions of this software were developed by the University of Cambridge
  11  * Computer Laboratory as part of the CTSRD Project, with support from the
  12  * UK Higher Education Innovation Fund (HEIF).
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/syscall.h>
  37 #include <machine/asm.h>
  38
  39 #define _SYSCALL(name)                                          \
  40         li      t0, SYS_ ## name;                               \
  41         ecall
  42
  43 #define _SYSCALL_BODY(name)                                     \
  44         _SYSCALL(name);                                         \
  45         bnez    t0, 1f;                                         \
  46         ret;                                                    \
  47 1:      la      t1, cerror;                                     \
  48         jr      t1
  49
  50 #define PSEUDO(name)                                            \
  51 ENTRY(__sys_##name);                                            \
  52         WEAK_REFERENCE(__sys_##name, _##name);                  \
  53         _SYSCALL_BODY(name);                                    \
  54 END(__sys_##name)
  55
  56 #define RSYSCALL(name)                                          \
  57 ENTRY(__sys_##name);                                            \
  58         WEAK_REFERENCE(__sys_##name, name);                     \
  59         WEAK_REFERENCE(__sys_##name, _##name);                  \
  60         _SYSCALL_BODY(name);                                    \
  61 END(__sys_##name)