[1] | 1 | /* |
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[23] | 2 | * sys_write.c - write bytes to a file |
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[1] | 3 | * |
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[23] | 4 | * Author Alain Greiner (2016,2017) |
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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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[23] | 24 | #include <kernel_config.h> |
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| 25 | #include <hal_types.h> |
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| 26 | #include <hal_uspace.h> |
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[409] | 27 | #include <hal_irqmask.h> |
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[23] | 28 | #include <hal_special.h> |
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[1] | 29 | #include <errno.h> |
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| 30 | #include <vfs.h> |
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| 31 | #include <thread.h> |
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[23] | 32 | #include <printk.h> |
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| 33 | #include <process.h> |
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[1] | 34 | |
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[407] | 35 | /* TODO: concurrent user page(s) unmap need to be handled [AG] */ |
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[23] | 36 | |
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| 37 | ////////////////////////////////// |
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| 38 | int sys_write( uint32_t file_id, |
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[407] | 39 | void * vaddr, |
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[23] | 40 | uint32_t count ) |
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[1] | 41 | { |
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[23] | 42 | error_t error; |
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[408] | 43 | paddr_t paddr; // unused, but required for user space checking |
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| 44 | xptr_t file_xp; // remote file extended pointer |
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| 45 | uint32_t nbytes; // number of bytes actually written |
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| 46 | reg_t save_sr; // required to enable IRQs during syscall |
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[407] | 47 | |
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[433] | 48 | thread_t * this = CURRENT_THREAD; |
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| 49 | process_t * process = this->process; |
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| 50 | |
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| 51 | #if CONFIG_DEBUG_SYS_WRITE |
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[409] | 52 | uint32_t tm_start; |
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| 53 | uint32_t tm_end; |
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| 54 | tm_start = hal_get_cycles(); |
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[433] | 55 | if( CONFIG_DEBUG_SYS_WRITE < tm_start ) |
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| 56 | printk("\n[DBG] %s : thread %x / process %x / vaddr %x / count %d / cycle %d\n", |
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| 57 | __FUNCTION__, this, process->pid, vaddr, count, (uint32_t)tm_start ); |
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[409] | 58 | #endif |
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[1] | 59 | |
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[23] | 60 | // check file_id argument |
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| 61 | if( file_id >= CONFIG_PROCESS_FILE_MAX_NR ) |
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[1] | 62 | { |
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[433] | 63 | |
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| 64 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 65 | printk("\n[ERROR] in %s : illegal file descriptor index\n", __FUNCTION__ ); |
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| 66 | #endif |
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[23] | 67 | this->errno = EBADFD; |
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[1] | 68 | return -1; |
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| 69 | } |
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| 70 | |
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[23] | 71 | // check user buffer in user space |
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[407] | 72 | error = vmm_v2p_translate( false , vaddr , &paddr ); |
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[23] | 73 | |
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| 74 | if ( error ) |
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| 75 | { |
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[433] | 76 | |
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| 77 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 78 | printk("\n[ERROR] in %s : user buffer unmapped = %x\n", __FUNCTION__ , (intptr_t)vaddr ); |
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| 79 | #endif |
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[23] | 80 | this->errno = EINVAL; |
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| 81 | return -1; |
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| 82 | } |
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| 83 | |
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[408] | 84 | // enable IRQs |
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| 85 | hal_enable_irq( &save_sr ); |
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| 86 | |
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[23] | 87 | // get extended pointer on remote file descriptor |
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| 88 | file_xp = process_fd_get_xptr( process , file_id ); |
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| 89 | |
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| 90 | if( file_xp == XPTR_NULL ) |
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| 91 | { |
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[433] | 92 | |
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| 93 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 94 | printk("\n[ERROR] in %s : undefined file descriptor index = %d in process %x\n", |
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| 95 | __FUNCTION__ , file_id , process->pid ); |
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| 96 | #endif |
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[23] | 97 | this->errno = EBADFD; |
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| 98 | return -1; |
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| 99 | } |
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| 100 | |
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| 101 | // get file descriptor cluster and local pointer |
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| 102 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
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| 103 | cxy_t file_cxy = GET_CXY( file_xp ); |
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| 104 | |
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[421] | 105 | |
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[407] | 106 | // get file type |
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| 107 | vfs_inode_type_t type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
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[313] | 108 | |
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[407] | 109 | // action depend on file type |
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[421] | 110 | if( type == INODE_TYPE_FILE ) // check file writable & write to mapper |
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[23] | 111 | { |
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[421] | 112 | // check file writable |
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| 113 | uint32_t attr = hal_remote_lw( XPTR( file_cxy , &file_ptr->attr ) ); |
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| 114 | if( (attr & FD_ATTR_WRITE_ENABLE) == 0 ) |
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| 115 | { |
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[433] | 116 | |
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| 117 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 118 | printk("\n[ERROR] in %s : file %d not writable in process %x\n", |
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| 119 | __FUNCTION__ , file_id , process->pid ); |
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| 120 | #endif |
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[421] | 121 | this->errno = EBADFD; |
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| 122 | return -1; |
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| 123 | } |
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| 124 | |
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| 125 | // move count bytes to mapper |
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[407] | 126 | nbytes = vfs_user_move( false, // from buffer to mapper |
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| 127 | file_xp, |
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| 128 | vaddr, |
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| 129 | count ); |
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| 130 | } |
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[421] | 131 | else if( type == INODE_TYPE_DEV ) // check ownership & write to device |
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[407] | 132 | { |
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[421] | 133 | // move count bytes to device |
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[407] | 134 | nbytes = devfs_user_move( false, // from buffer to device |
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| 135 | file_xp, |
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| 136 | vaddr, |
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| 137 | count ); |
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| 138 | } |
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| 139 | else |
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| 140 | { |
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| 141 | nbytes = 0; |
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[421] | 142 | assert( false , __FUNCTION__ , "file type %d non supported\n", type ); |
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[407] | 143 | } |
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| 144 | |
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| 145 | if( nbytes != count ) |
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| 146 | { |
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[433] | 147 | |
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| 148 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 149 | printk("\n[ERROR] in %s cannot write data to file %d in process %x\n", |
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| 150 | __FUNCTION__ , file_id , process->pid ); |
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| 151 | #endif |
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[313] | 152 | this->errno = error; |
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| 153 | return -1; |
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[23] | 154 | } |
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| 155 | |
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[408] | 156 | // restore IRQs |
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| 157 | hal_restore_irq( save_sr ); |
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| 158 | |
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[124] | 159 | hal_fence(); |
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[23] | 160 | |
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[433] | 161 | #if CONFIG_DEBUG_SYS_WRITE |
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[409] | 162 | tm_end = hal_get_cycles(); |
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[433] | 163 | if( CONFIG_DEBUG_SYS_WRITE < tm_end ) |
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| 164 | printk("\n[DBG] %s : thread %x in process %x / cycle %d\n" |
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[408] | 165 | "nbytes = %d / first byte = %c / file_id = %d / cost = %d\n", |
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[433] | 166 | __FUNCTION__, this, process->pid, (uint32_t)tm_start, |
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| 167 | nbytes, *((char *)(intptr_t)paddr) , file_id , (uint32_t)(tm_end - tm_start) ); |
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[409] | 168 | #endif |
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[407] | 169 | |
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| 170 | return nbytes; |
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| 171 | |
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[23] | 172 | } // end sys_write() |
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