| 1 | /*
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| 2 | * sys_write.c - write bytes to a file
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017,2018)
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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 <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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| 27 | #include <hal_irqmask.h>
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| 28 | #include <hal_special.h>
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| 29 | #include <errno.h>
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| 30 | #include <vfs.h>
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| 31 | #include <thread.h>
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| 32 | #include <printk.h>
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| 33 | #include <process.h>
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| 34 |
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| 35 | /* TODO: concurrent user page(s) unmap need to be handled [AG] */
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| 36 |
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| 37 | extern uint32_t enter_sys_write;
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| 38 | extern uint32_t enter_devfs_write;
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| 39 | extern uint32_t enter_txt_write;
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| 40 | extern uint32_t enter_chdev_cmd_write;
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| 41 | extern uint32_t enter_chdev_server_write;
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| 42 | extern uint32_t enter_tty_cmd_write;
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| 43 | extern uint32_t enter_tty_isr_write;
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| 44 | extern uint32_t exit_tty_isr_write;
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| 45 | extern uint32_t exit_tty_cmd_write;
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| 46 | extern uint32_t exit_chdev_server_write;
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| 47 | extern uint32_t exit_chdev_cmd_write;
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| 48 | extern uint32_t exit_txt_write;
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| 49 | extern uint32_t exit_devfs_write;
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| 50 | extern uint32_t exit_sys_write;
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| 51 |
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| 52 | //////////////////////////////////
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| 53 | int sys_write( uint32_t file_id,
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| 54 | void * vaddr,
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| 55 | uint32_t count )
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| 56 | {
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| 57 | error_t error;
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| 58 | vseg_t * vseg; // required for user space checking
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| 59 | xptr_t file_xp; // remote file extended pointer
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| 60 | uint32_t nbytes; // number of bytes actually written
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| 61 | reg_t save_sr; // required to enable IRQs during syscall
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| 62 |
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| 63 | #if (DEBUG_SYS_WRITE & 1)
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| 64 | enter_sys_write = (uint32_t)tm_start;
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| 65 | #endif
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| 66 |
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| 67 | thread_t * this = CURRENT_THREAD;
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| 68 | process_t * process = this->process;
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| 69 |
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| 70 | #if DEBUG_SYS_WRITE
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| 71 | uint32_t tm_start;
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| 72 | uint32_t tm_end;
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| 73 | tm_start = hal_get_cycles();
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| 74 | if( DEBUG_SYS_WRITE < tm_start )
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| 75 | printk("\n[DBG] %s : thread %x enter / process %x / vaddr %x / count %d / cycle %d\n",
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| 76 | __FUNCTION__, this, process->pid, vaddr, count, (uint32_t)tm_start );
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| 77 | #endif
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| 78 |
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| 79 | // check file_id argument
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| 80 | if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
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| 81 | {
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| 82 |
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| 83 | #if DEBUG_SYSCALLS_ERROR
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| 84 | printk("\n[ERROR] in %s : illegal file descriptor index\n", __FUNCTION__ );
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| 85 | #endif
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| 86 | this->errno = EBADFD;
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| 87 | return -1;
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| 88 | }
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| 89 |
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| 90 | // check user buffer in user space
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| 91 | error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
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| 92 |
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| 93 | if ( error )
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| 94 | {
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| 95 |
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| 96 | #if DEBUG_SYSCALLS_ERROR
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| 97 | printk("\n[ERROR] in %s : user buffer unmapped %x / thread %x / process %x\n",
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| 98 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid );
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| 99 | vmm_display( process , false );
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| 100 | #endif
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| 101 | this->errno = EINVAL;
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| 102 | return -1;
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| 103 | }
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| 104 |
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| 105 | // enable IRQs
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| 106 | hal_enable_irq( &save_sr );
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| 107 |
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| 108 | // get extended pointer on remote file descriptor
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| 109 | file_xp = process_fd_get_xptr( process , file_id );
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| 110 |
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| 111 | if( file_xp == XPTR_NULL )
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| 112 | {
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| 113 |
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| 114 | #if DEBUG_SYSCALLS_ERROR
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| 115 | printk("\n[ERROR] in %s : undefined file descriptor index = %d in process %x\n",
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| 116 | __FUNCTION__ , file_id , process->pid );
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| 117 | #endif
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| 118 | this->errno = EBADFD;
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| 119 | return -1;
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| 120 | }
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| 121 |
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| 122 | // get file descriptor cluster and local pointer
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| 123 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp );
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| 124 | cxy_t file_cxy = GET_CXY( file_xp );
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| 125 |
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| 126 |
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| 127 | // get file type
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| 128 | vfs_inode_type_t type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
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| 129 |
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| 130 | // action depend on file type
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| 131 | if( type == INODE_TYPE_FILE ) // check file writable & write to mapper
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| 132 | {
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| 133 | // check file writable
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| 134 | uint32_t attr = hal_remote_lw( XPTR( file_cxy , &file_ptr->attr ) );
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| 135 | if( (attr & FD_ATTR_WRITE_ENABLE) == 0 )
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| 136 | {
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| 137 |
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| 138 | #if DEBUG_SYSCALLS_ERROR
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| 139 | printk("\n[ERROR] in %s : file %d not writable in process %x\n",
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| 140 | __FUNCTION__ , file_id , process->pid );
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| 141 | #endif
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| 142 | this->errno = EBADFD;
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| 143 | return -1;
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| 144 | }
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| 145 |
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| 146 | // move count bytes to mapper
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| 147 | nbytes = vfs_user_move( false, // from buffer to mapper
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| 148 | file_xp,
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| 149 | vaddr,
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| 150 | count );
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| 151 | }
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| 152 | else if( type == INODE_TYPE_DEV ) // check ownership & write to device
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| 153 | {
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| 154 | // move count bytes to device
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| 155 | nbytes = devfs_user_move( false, // from buffer to device
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| 156 | file_xp,
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| 157 | vaddr,
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| 158 | count );
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| 159 | }
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| 160 | else
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| 161 | {
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| 162 | nbytes = 0;
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| 163 | assert( false , __FUNCTION__ , "file type %d non supported\n", type );
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| 164 | }
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| 165 |
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| 166 | if( nbytes != count )
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| 167 | {
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| 168 |
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| 169 | #if DEBUG_SYSCALLS_ERROR
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| 170 | printk("\n[ERROR] in %s cannot write data to file %d in process %x\n",
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| 171 | __FUNCTION__ , file_id , process->pid );
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| 172 | #endif
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| 173 | this->errno = error;
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| 174 | return -1;
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| 175 | }
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| 176 |
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| 177 | // restore IRQs
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| 178 | hal_restore_irq( save_sr );
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| 179 |
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| 180 | hal_fence();
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| 181 |
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| 182 | #if DEBUG_SYS_WRITE
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| 183 | tm_end = hal_get_cycles();
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| 184 | if( DEBUG_SYS_WRITE < tm_end )
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| 185 | printk("\n[DBG] %s : thread %x exit / process %x / cycle %d\n"
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| 186 | "nbytes = %d / first byte = %c / file_id = %d / cost = %d\n",
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| 187 | __FUNCTION__, this, process->pid, (uint32_t)tm_start,
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| 188 | nbytes, *((char *)(intptr_t)paddr) , file_id , (uint32_t)(tm_end - tm_start) );
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| 189 | #endif
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| 190 |
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| 191 | #if (DEBUG_SYS_WRITE & 1)
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| 192 | exit_sys_write = (uint32_t)tm_end;
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| 193 |
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| 194 | printk("\n@@@@@@@@@@@@ timing to write string %c\n"
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| 195 | " - enter_sys_write = %d / delta %d\n"
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| 196 | " - enter_devfs_write = %d / delta %d\n"
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| 197 | " - enter_txt_write = %d / delta %d\n"
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| 198 | " - enter_chdev_cmd_write = %d / delta %d\n"
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| 199 | " - enter_chdev_server_write = %d / delta %d\n"
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| 200 | " - enter_tty_cmd_write = %d / delta %d\n"
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| 201 | " - enter_tty_isr_write = %d / delta %d\n"
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| 202 | " - exit_tty_isr_write = %d / delta %d\n"
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| 203 | " - exit_tty_cmd_write = %d / delta %d\n"
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| 204 | " - exit_chdev_server_write = %d / delta %d\n"
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| 205 | " - exit_chdev_cmd_write = %d / delta %d\n"
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| 206 | " - exit_txt_write = %d / delta %d\n"
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| 207 | " - exit_devfs_write = %d / delta %d\n"
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| 208 | " - exit_sys_write = %d / delta %d\n",
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| 209 | *((char *)(intptr_t)paddr) ,
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| 210 | enter_sys_write , 0 ,
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| 211 | enter_devfs_write , enter_devfs_write - enter_sys_write ,
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| 212 | enter_txt_write , enter_txt_write - enter_devfs_write ,
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| 213 | enter_chdev_cmd_write , enter_chdev_cmd_write - enter_txt_write ,
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| 214 | enter_chdev_server_write , enter_chdev_server_write - enter_chdev_cmd_write ,
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| 215 | enter_tty_cmd_write , enter_tty_cmd_write - enter_chdev_server_write ,
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| 216 | enter_tty_isr_write , enter_tty_isr_write - enter_tty_cmd_write ,
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| 217 | exit_tty_isr_write , exit_tty_isr_write - enter_tty_isr_write ,
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| 218 | exit_tty_cmd_write , exit_tty_cmd_write - exit_tty_isr_write ,
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| 219 | exit_chdev_server_write , exit_chdev_server_write - exit_tty_cmd_write ,
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| 220 | exit_chdev_cmd_write , exit_chdev_cmd_write - exit_chdev_server_write ,
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| 221 | exit_txt_write , exit_txt_write - exit_chdev_cmd_write ,
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| 222 | exit_devfs_write , exit_devfs_write - exit_txt_write ,
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| 223 | exit_sys_write , exit_sys_write - exit_devfs_write );
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| 224 | #endif
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| 225 |
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| 226 | return nbytes;
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| 227 |
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| 228 | } // end sys_write()
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