source: trunk/hal/tsar_mips32/hal_syscall.c @ 43

Last change on this file since 43 was 16, checked in by alain, 6 years ago

mprove the HAL for interrupt, exception, syscall handling.

File size: 1.7 KB
Line 
1/*
2 * hal_syscall.c - Implementation of syscall handler for TSAR-MIPS32.
3 *
4 * Author    Alain Greiner (2016,2017)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_types.h>
25#include <hal_syscall.h>
26#include <do_syscall.h>
27#include <thread.h>
28#include <mips32_uzone.h>
29
30
31/////////////////////////////////////
32void hal_do_syscall( thread_t * this,
33                     reg_t    * regs_tbl )
34{
35        register reg_t      arg0;
36        register reg_t      arg1;
37        register reg_t      arg2;
38        register reg_t      arg3;
39        register reg_t      service_num;
40        register reg_t      retval;
41 
42        service_num = regs_tbl[UZ_V0];
43
44        arg0        = regs_tbl[UZ_A0];
45        arg1        = regs_tbl[UZ_A1];
46        arg2        = regs_tbl[UZ_A2];
47        arg3        = regs_tbl[UZ_A3];
48 
49    // call architecture independant syscall handler
50        retval = do_syscall( this,
51                         arg0,
52                         arg1,
53                         arg2,
54                         arg3,
55                         service_num );
56
57        regs_tbl[UZ_V0]   = retval;
58        regs_tbl[UZ_V1]   = this->errno;
59        regs_tbl[UZ_EPC] += 4;
60}
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