mes/lib/linux/riscv64-mes-mescc/syscall-internal.c

58 lines
1.6 KiB
C
Raw Normal View History

/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
* Copyright © 2023 Andrius Štikonas <andrius@stikonas.eu>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <linux/riscv64/syscall.h>
static long
__sys_call_internal (long sys_call)
{
asm ("rd_a7 rs1_fp !16 ld");
asm ("ecall");
asm ("rd_t0 rs1_a0 mv");
}
static long
__sys_call2_internal (long sys_call, long one, long two)
{
asm ("rd_a7 rs1_fp !16 ld");
asm ("rd_a0 rs1_fp !24 ld");
asm ("rd_a1 rs1_fp !32 ld");
asm ("ecall");
asm ("rd_t0 rs1_a0 mv");
}
/* Return < 0 on error (errno-like value from kernel), or 0 on success */
int
__raise (int signum)
{
long pid = __sys_call_internal (SYS_getpid);
if (pid < 0)
return pid;
else
return __sys_call2_internal (SYS_kill, pid, signum);
}