[1] | 1 | /* |
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| 2 | * sys_sem.c - Acces a POSIX unamed semaphore. |
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| 3 | * |
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[440] | 4 | * Authors Alain Greiner (2016,2017,2018) |
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[1] | 5 | * |
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[23] | 6 | * Copyright (c) UPMC Sorbonne Universites |
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[1] | 7 | * |
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[23] | 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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[1] | 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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[23] | 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[1] | 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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[23] | 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[1] | 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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[23] | 25 | #include <hal_uspace.h> |
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| 26 | #include <errno.h> |
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| 27 | #include <thread.h> |
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| 28 | #include <printk.h> |
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| 29 | #include <vmm.h> |
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[1] | 30 | #include <remote_sem.h> |
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[23] | 31 | #include <syscalls.h> |
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[1] | 32 | |
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| 33 | ////////////////////////////////// |
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| 34 | int sys_sem( void * vaddr, // semaphore virtual address |
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| 35 | uint32_t operation, // requested operation type |
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| 36 | uint32_t * value ) // pointer on in/out argument |
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| 37 | { |
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[440] | 38 | uint32_t data; |
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| 39 | vseg_t * vseg; |
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| 40 | error_t error; |
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[1] | 41 | |
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[440] | 42 | thread_t * this = CURRENT_THREAD; |
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| 43 | process_t * process = this->process; |
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[1] | 44 | |
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| 45 | // check vaddr in user vspace |
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[440] | 46 | error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg ); |
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[23] | 47 | if( error ) |
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[1] | 48 | { |
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[440] | 49 | |
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| 50 | #if DEBUG_SYSCALLS_ERROR |
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| 51 | printk("\n[ERROR] in %s : unmapped semaphore %x / thread %x / process %x\n", |
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| 52 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid ); |
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| 53 | vmm_display( process , false ); |
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| 54 | #endif |
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| 55 | this->errno = EINVAL; |
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[1] | 56 | return -1; |
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| 57 | } |
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| 58 | |
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| 59 | // check value in user vspace |
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[440] | 60 | error = vmm_get_vseg( process , (intptr_t)value , &vseg ); |
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[23] | 61 | if( error ) |
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[1] | 62 | { |
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[440] | 63 | |
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| 64 | #if DEBUG_SYSCALLS_ERROR |
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| 65 | printk("\n[ERROR] in %s : unmapped value %x / thread %x / process %x\n", |
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| 66 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid ); |
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| 67 | vmm_display( process , false ); |
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| 68 | #endif |
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| 69 | this->errno = EINVAL; |
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| 70 | return -1; |
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[1] | 71 | } |
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[440] | 72 | |
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[1] | 73 | // execute requested operation |
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| 74 | switch( operation ) |
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| 75 | { |
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| 76 | ////////////// |
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| 77 | case SEM_INIT: |
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| 78 | { |
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| 79 | // get argument |
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| 80 | hal_copy_from_uspace( &data , value , sizeof(uint32_t) ); |
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| 81 | |
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| 82 | // call init function |
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[23] | 83 | error = remote_sem_create( (intptr_t)vaddr , data ); |
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[1] | 84 | |
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| 85 | if ( error ) |
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| 86 | { |
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[23] | 87 | printk("\n[ERROR] in %s : cannot create semaphore = %x\n", |
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| 88 | __FUNCTION__ , (intptr_t)value ); |
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[1] | 89 | this->errno = error; |
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| 90 | return -1; |
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| 91 | } |
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| 92 | break; |
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| 93 | } |
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| 94 | ////////////////// |
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| 95 | case SEM_GETVALUE: |
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| 96 | { |
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| 97 | // get extended pointer on remote semaphore |
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| 98 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 99 | |
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| 100 | if( sem_xp == XPTR_NULL ) // user error |
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| 101 | { |
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[440] | 102 | |
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| 103 | #if DEBUG_SYSCALLS_ERROR |
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| 104 | printk("\n[ERROR] in %s : semaphore %x not registered / thread %x / process %x\n", |
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| 105 | __FUNCTION__ , (intptr_t)value, this->trdid, process->pid ); |
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| 106 | #endif |
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[1] | 107 | this->errno = EINVAL; |
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| 108 | return -1; |
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| 109 | } |
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| 110 | else // success |
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| 111 | { |
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| 112 | // get semaphore current value |
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| 113 | remote_sem_get_value( sem_xp , &data ); |
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| 114 | |
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| 115 | // return value to user |
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| 116 | hal_copy_to_uspace( value , &data , sizeof(uint32_t) ); |
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| 117 | } |
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| 118 | break; |
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| 119 | } |
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| 120 | ////////////// |
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| 121 | case SEM_WAIT: |
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| 122 | { |
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| 123 | // get extended pointer on remote semaphore |
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| 124 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 125 | |
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| 126 | if( sem_xp == XPTR_NULL ) // user error |
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| 127 | { |
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[440] | 128 | |
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| 129 | #if DEBUG_SYSCALLS_ERROR |
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| 130 | printk("\n[ERROR] in %s : semaphore %x not registered / thread %x / process %x\n", |
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| 131 | __FUNCTION__ , (intptr_t)value, this->trdid, process->pid ); |
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| 132 | #endif |
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[1] | 133 | this->errno = EINVAL; |
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| 134 | return -1; |
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| 135 | } |
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| 136 | else // success |
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| 137 | { |
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| 138 | // wait semaphore available |
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| 139 | remote_sem_wait( sem_xp ); |
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| 140 | } |
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| 141 | break; |
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| 142 | } |
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| 143 | ////////////// |
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| 144 | case SEM_POST: |
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| 145 | { |
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| 146 | // get extended pointer on remote semaphore |
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| 147 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 148 | |
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| 149 | if( sem_xp == XPTR_NULL ) // user error |
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| 150 | { |
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[440] | 151 | |
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| 152 | #if DEBUG_SYSCALLS_ERROR |
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| 153 | printk("\n[ERROR] in %s : semaphore %x not registered / thread %x / process %x\n", |
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| 154 | __FUNCTION__ , (intptr_t)value, this->trdid, process->pid ); |
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| 155 | #endif |
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[1] | 156 | this->errno = EINVAL; |
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| 157 | return -1; |
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| 158 | } |
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| 159 | else // success |
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| 160 | { |
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| 161 | // release semaphore |
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| 162 | remote_sem_post( sem_xp ); |
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| 163 | } |
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| 164 | break; |
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| 165 | } |
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| 166 | ///////////////// |
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| 167 | case SEM_DESTROY: |
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| 168 | { |
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| 169 | // get extended pointer on remote semaphore |
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| 170 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 171 | |
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| 172 | if( sem_xp == XPTR_NULL ) // user error |
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| 173 | { |
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[440] | 174 | |
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| 175 | #if DEBUG_SYSCALLS_ERROR |
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| 176 | printk("\n[ERROR] in %s : semaphore %x not registered / thread %x / process %x\n", |
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| 177 | __FUNCTION__ , (intptr_t)value, this->trdid, process->pid ); |
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| 178 | #endif |
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[1] | 179 | this->errno = EINVAL; |
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| 180 | return -1; |
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| 181 | } |
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| 182 | else // success |
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| 183 | { |
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| 184 | // destroy semaphore |
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| 185 | remote_sem_destroy( sem_xp ); |
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| 186 | } |
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| 187 | break; |
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| 188 | } |
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| 189 | /////// |
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| 190 | default: // undefined operation |
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| 191 | { |
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[23] | 192 | printk("\n[PANIC] in %s : illegal operation type\n", __FUNCTION__ ); |
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| 193 | hal_core_sleep(); |
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[1] | 194 | } |
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| 195 | } |
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| 196 | |
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| 197 | return 0; |
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| 198 | |
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| 199 | } // end sys_sem() |
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