1 | /* |
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2 | * hal_syscall.c - Implementation of syscall handler for TSAR-MIPS32. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <hal_kernel_types.h> |
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25 | #include <hal_syscall.h> |
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26 | #include <do_syscall.h> |
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27 | #include <thread.h> |
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28 | #include <printk.h> |
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29 | #include <hal_kentry.h> |
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30 | |
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31 | /////////////////////////// |
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32 | void hal_do_syscall( void ) |
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33 | { |
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34 | thread_t * this; |
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35 | |
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36 | uint32_t * enter_uzone; |
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37 | uint32_t * exit_uzone; |
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38 | |
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39 | uint32_t arg0; |
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40 | uint32_t arg1; |
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41 | uint32_t arg2; |
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42 | uint32_t arg3; |
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43 | uint32_t service_num; |
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44 | uint32_t retval; |
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45 | |
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46 | // get pointer on enter_thread uzone |
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47 | this = CURRENT_THREAD; |
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48 | enter_uzone = (uint32_t *)this->uzone_current; |
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49 | |
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50 | // get syscall arguments from uzone |
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51 | service_num = enter_uzone[UZ_V0]; |
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52 | arg0 = enter_uzone[UZ_A0]; |
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53 | arg1 = enter_uzone[UZ_A1]; |
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54 | arg2 = enter_uzone[UZ_A2]; |
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55 | arg3 = enter_uzone[UZ_A3]; |
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56 | |
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57 | // call architecture independant syscall handler |
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58 | retval = do_syscall( this, |
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59 | arg0, |
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60 | arg1, |
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61 | arg2, |
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62 | arg3, |
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63 | service_num ); |
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64 | |
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65 | // get pointer on exit_thread uzone, because exit thread |
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66 | // can be different from enter_thread for a fork syscall |
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67 | this = CURRENT_THREAD; |
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68 | exit_uzone = (uint32_t *)this->uzone_current; |
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69 | |
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70 | // set return value to uzone |
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71 | exit_uzone[UZ_V0] = retval; |
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72 | |
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73 | // update EPC in uzone |
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74 | exit_uzone[UZ_EPC] += 4; |
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75 | |
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76 | hal_fence(); |
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77 | } |
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