| 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_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() |
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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 | //printk("\n@@@ enter %s : thread = %x / enter_uzone = %x / EPC = %x\n", |
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| 51 | //__FUNCTION__ , this , enter_uzone , enter_uzone[UZ_EPC] ); |
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| 52 | |
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| 53 | // get syscall arguments from uzone |
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| 54 | service_num = enter_uzone[UZ_V0]; |
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| 55 | arg0 = enter_uzone[UZ_A0]; |
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| 56 | arg1 = enter_uzone[UZ_A1]; |
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| 57 | arg2 = enter_uzone[UZ_A2]; |
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| 58 | arg3 = enter_uzone[UZ_A3]; |
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| 59 | |
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| 60 | // call architecture independant syscall handler |
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| 61 | retval = do_syscall( this, |
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| 62 | arg0, |
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| 63 | arg1, |
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| 64 | arg2, |
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| 65 | arg3, |
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| 66 | service_num ); |
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| 67 | |
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| 68 | // get pointer on exit_thread uzone, because |
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| 69 | // exit_thread can be different from enter_thread |
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| 70 | this = CURRENT_THREAD; |
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| 71 | exit_uzone = (uint32_t *)this->uzone_current; |
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| 72 | |
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| 73 | //printk("\n@@@ exit %s : thread = %x / exit_uzone = %x / EPC = %x\n", |
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| 74 | //__FUNCTION__ , this , exit_uzone , exit_uzone[UZ_EPC] ); |
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| 75 | |
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| 76 | // set return value to uzone |
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| 77 | exit_uzone[UZ_V0] = retval; |
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| 78 | |
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| 79 | // update EPC in uzone |
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| 80 | exit_uzone[UZ_EPC] += 4; |
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| 81 | |
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| 82 | hal_fence(); |
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| 83 | } |
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