source: trunk/hal/tsar_mips32/core/hal_syscall.c @ 416

Last change on this file since 416 was 416, checked in by alain, 4 years ago

Improve sys_exec.

File size: 2.1 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 <printk.h>
29#include <hal_kentry.h>
30
31
32/////////////////////
33void hal_do_syscall()
34{
35    thread_t    * this;
36
37    uint32_t    * enter_uzone;
38    uint32_t    * exit_uzone;
39
40        uint32_t      arg0;
41        uint32_t      arg1;
42        uint32_t      arg2;
43        uint32_t      arg3;
44        uint32_t      service_num;
45        uint32_t      retval;
46 
47    // get pointer on enter_thread uzone
48    this        = CURRENT_THREAD;
49    enter_uzone = (uint32_t *)this->uzone;
50
51    // get syscall arguments from uzone
52        service_num = enter_uzone[UZ_V0];
53        arg0        = enter_uzone[UZ_A0];
54        arg1        = enter_uzone[UZ_A1];
55        arg2        = enter_uzone[UZ_A2];
56        arg3        = enter_uzone[UZ_A3];
57 
58    // call architecture independant syscall handler
59        retval = do_syscall( this,
60                         arg0,
61                         arg1,
62                         arg2,
63                         arg3,
64                         service_num );
65
66    // get pointer on exit_thread uzone,
67    // exit_thread can be different from enter_thread
68    this       = CURRENT_THREAD;
69    exit_uzone = (uint32_t *)this->uzone;
70
71    // set syscall return value to uzone
72        exit_uzone[UZ_V0] = retval;
73
74    // update EPC in uzone
75        exit_uzone[UZ_EPC] += 4;
76
77}
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