[1] | 1 | /* |
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[23] | 2 | * sys_mmap.c - map files, memory or devices into process virtual address space |
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[1] | 3 | * |
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[23] | 4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012) |
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| 5 | * Alain Greiner (2016,2017) |
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[1] | 6 | * |
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[23] | 7 | * Copyright (c) UPMC Sorbonne Universites |
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[1] | 8 | * |
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[23] | 9 | * This file is part of ALMOS-MKH. |
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| 10 | * |
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| 11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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[1] | 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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[23] | 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[1] | 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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[23] | 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[1] | 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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[23] | 25 | #include <hal_types.h> |
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[407] | 26 | #include <hal_uspace.h> |
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[435] | 27 | #include <hal_irqmask.h> |
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[407] | 28 | #include <shared_syscalls.h> |
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[1] | 29 | #include <errno.h> |
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| 30 | #include <thread.h> |
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[23] | 31 | #include <printk.h> |
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[407] | 32 | #include <mapper.h> |
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[1] | 33 | #include <vfs.h> |
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| 34 | #include <process.h> |
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| 35 | #include <vmm.h> |
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| 36 | |
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[407] | 37 | ////////////////////////////////// |
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[23] | 38 | int sys_mmap( mmap_attr_t * attr ) |
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[1] | 39 | { |
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[407] | 40 | vseg_t * vseg; |
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| 41 | cxy_t vseg_cxy; |
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| 42 | vseg_type_t vseg_type; |
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| 43 | mmap_attr_t k_attr; // attributes copy in kernel space |
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| 44 | xptr_t mapper_xp; |
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| 45 | error_t error; |
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| 46 | paddr_t paddr; // unused, but required for user space checking |
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[435] | 47 | reg_t save_sr; // required to enable IRQs |
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[1] | 48 | |
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[407] | 49 | thread_t * this = CURRENT_THREAD; |
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| 50 | process_t * process = this->process; |
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| 51 | |
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[435] | 52 | #if CONFIG_DEBUG_SYS_MMAP |
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| 53 | uint64_t tm_start; |
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| 54 | uint64_t tm_end; |
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| 55 | tm_start = hal_get_cycles(); |
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| 56 | if ( CONFIG_DEBUG_SYS_MMAP < tm_start ) |
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| 57 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n", |
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| 58 | __FUNCTION__, this, process->pid, (uint32_t)tm_start ); |
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| 59 | #endif |
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| 60 | |
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[407] | 61 | // check arguments in user space |
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| 62 | error = vmm_v2p_translate( false , attr , &paddr ); |
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| 63 | |
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| 64 | if ( error ) |
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| 65 | { |
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[435] | 66 | |
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| 67 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 68 | printk("\n[ERROR] in %s : arguments not in used space = %x\n", __FUNCTION__ , (intptr_t)attr ); |
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| 69 | #endif |
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[407] | 70 | this->errno = EINVAL; |
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| 71 | return -1; |
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| 72 | } |
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| 73 | |
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| 74 | // copy arguments from uspace |
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| 75 | hal_copy_from_uspace( &k_attr , attr , sizeof(mmap_attr_t) ); |
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| 76 | |
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| 77 | // get fdid, offset, and length arguments |
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| 78 | uint32_t fdid = k_attr.fdid; |
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| 79 | uint32_t offset = k_attr.offset; |
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| 80 | uint32_t length = k_attr.length; |
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| 81 | |
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| 82 | // get flags |
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| 83 | bool_t map_fixed = ( (k_attr.flags & MAP_FIXED) != 0 ); |
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| 84 | bool_t map_anon = ( (k_attr.flags & MAP_ANON) != 0 ); |
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| 85 | bool_t map_remote = ( (k_attr.flags & MAP_REMOTE) != 0 ); |
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| 86 | bool_t map_shared = ( (k_attr.flags & MAP_SHARED) != 0 ); |
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| 87 | bool_t map_private = ( (k_attr.flags & MAP_PRIVATE) != 0 ); |
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| 88 | |
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| 89 | // MAP_FIXED not supported |
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| 90 | if( map_fixed ) |
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| 91 | { |
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[435] | 92 | |
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| 93 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 94 | printk("\n[ERROR] in %s : MAP_FIXED not supported\n", __FUNCTION__ ); |
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| 95 | #endif |
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[407] | 96 | this->errno = EINVAL; |
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| 97 | return -1; |
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| 98 | } |
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| 99 | |
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| 100 | if( map_shared == map_private ) |
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| 101 | { |
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[435] | 102 | |
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| 103 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 104 | printk("\n[ERROR] in %s : MAP_SHARED xor MAP_PRIVATE\n", __FUNCTION__ ); |
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| 105 | #endif |
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[407] | 106 | this->errno = EINVAL; |
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| 107 | return -1; |
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| 108 | } |
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| 109 | |
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| 110 | // FIXME handle Copy_On_Write for MAP_PRIVATE... |
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| 111 | |
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| 112 | // get access rigths |
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| 113 | bool_t prot_read = ( (k_attr.prot & PROT_READ ) != 0 ); |
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| 114 | bool_t prot_write = ( (k_attr.prot & PROT_WRITE) != 0 ); |
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| 115 | |
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| 116 | // test mmap type : can be FILE / ANON / REMOTE |
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| 117 | |
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| 118 | if( (map_anon == false) && (map_remote == false) ) // FILE |
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| 119 | { |
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| 120 | // FIXME: handle concurent delete of file by another thread closing it |
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| 121 | |
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| 122 | if( fdid >= CONFIG_PROCESS_FILE_MAX_NR ) |
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[1] | 123 | { |
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[435] | 124 | |
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| 125 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 126 | printk("\n[ERROR] in %s: bad file descriptor = %d\n", __FUNCTION__ , fdid ); |
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| 127 | #endif |
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[407] | 128 | this->errno = EBADFD; |
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| 129 | return -1; |
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| 130 | } |
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[1] | 131 | |
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[407] | 132 | // get extended pointer on file descriptor |
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| 133 | xptr_t file_xp = process_fd_get_xptr( process , fdid ); |
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| 134 | |
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| 135 | if( file_xp == XPTR_NULL ) |
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| 136 | { |
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[435] | 137 | |
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| 138 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 139 | printk("\n[ERROR] in %s: file %d not found\n", __FUNCTION__ , fdid ); |
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| 140 | #endif |
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[407] | 141 | this->errno = EBADFD; |
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| 142 | return -1; |
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| 143 | } |
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| 144 | |
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| 145 | // get file cluster and local pointer |
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| 146 | cxy_t file_cxy = GET_CXY( file_xp ); |
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| 147 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
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| 148 | |
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| 149 | // get inode pointer, mapper pointer and file attributes |
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| 150 | vfs_inode_t * inode_ptr = hal_remote_lpt(XPTR(file_cxy , &file_ptr->inode )); |
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| 151 | uint32_t file_attr = hal_remote_lw (XPTR(file_cxy , &file_ptr->attr )); |
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| 152 | mapper_t * mapper_ptr = hal_remote_lpt(XPTR(file_cxy , &file_ptr->mapper)); |
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| 153 | |
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| 154 | // get file size |
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| 155 | uint32_t size = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ); |
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| 156 | |
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| 157 | // chek offset and length arguments |
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| 158 | if( (offset + length) > size) |
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[1] | 159 | { |
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[435] | 160 | |
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| 161 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 162 | printk("\n[ERROR] in %s: offset (%d) + len (%d) >= file's size (%d)\n", |
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| 163 | __FUNCTION__, k_attr.offset, k_attr.length, size ); |
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| 164 | #endif |
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[407] | 165 | this->errno = ERANGE; |
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| 166 | return -1; |
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[1] | 167 | } |
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| 168 | |
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[407] | 169 | // check access rights |
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| 170 | if( (prot_read && !(file_attr & FD_ATTR_READ_ENABLE)) || |
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| 171 | (prot_write && !(file_attr & FD_ATTR_WRITE_ENABLE)) ) |
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[1] | 172 | { |
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[435] | 173 | |
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| 174 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 175 | printk("\n[ERROR] in %s: prot = %x / file_attr = %x)\n", |
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| 176 | __FUNCTION__ , k_attr.prot , file_attr ); |
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| 177 | #endif |
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[407] | 178 | this->errno = EACCES; |
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| 179 | return -1; |
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[1] | 180 | } |
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| 181 | |
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[407] | 182 | // increment file refcount |
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| 183 | vfs_file_count_up( file_xp ); |
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[1] | 184 | |
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[407] | 185 | mapper_xp = XPTR( file_cxy , mapper_ptr ); |
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| 186 | vseg_type = VSEG_TYPE_FILE; |
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| 187 | vseg_cxy = file_cxy; |
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| 188 | } |
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| 189 | else // ANON or REMOTE |
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| 190 | { |
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| 191 | // no mapper for ANON or REMOTE |
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| 192 | mapper_xp = XPTR_NULL; |
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[1] | 193 | |
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[407] | 194 | if( map_anon ) |
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| 195 | { |
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| 196 | vseg_type = VSEG_TYPE_ANON; |
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| 197 | vseg_cxy = local_cxy; |
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| 198 | } |
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| 199 | else |
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| 200 | { |
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| 201 | vseg_type = VSEG_TYPE_REMOTE; |
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| 202 | vseg_cxy = k_attr.fdid; |
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| 203 | |
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| 204 | if( cluster_is_undefined( vseg_cxy ) ) |
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| 205 | { |
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[435] | 206 | |
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| 207 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 208 | printk("\n[ERROR] in %s : illegal cxy for MAP_REMOTE\n", __FUNCTION__ ); |
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| 209 | #endif |
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[407] | 210 | this->errno = EINVAL; |
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| 211 | return -1; |
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| 212 | } |
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| 213 | } |
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| 214 | } |
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[1] | 215 | |
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[435] | 216 | // enable IRQs |
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| 217 | hal_enable_irq( &save_sr ); |
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| 218 | |
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[407] | 219 | // get reference process cluster and local pointer |
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| 220 | xptr_t ref_xp = process->ref_xp; |
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| 221 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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| 222 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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| 223 | |
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| 224 | // create the vseg in reference cluster |
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| 225 | if( local_cxy == ref_cxy ) |
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| 226 | { |
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| 227 | vseg = vmm_create_vseg( process, |
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| 228 | vseg_type, |
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| 229 | 0, // base address unused for mmap() |
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| 230 | length, |
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| 231 | offset, |
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| 232 | 0, // file_size unused for mmap() |
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| 233 | mapper_xp, |
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| 234 | vseg_cxy ); |
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| 235 | } |
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| 236 | else |
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| 237 | { |
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| 238 | rpc_vmm_create_vseg_client( ref_cxy, |
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| 239 | ref_ptr, |
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| 240 | vseg_type, |
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| 241 | 0, // base address unused for mmap() |
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| 242 | length, |
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| 243 | offset, |
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| 244 | 0, // file size unused for mmap() |
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| 245 | mapper_xp, |
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| 246 | vseg_cxy, |
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| 247 | &vseg ); |
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| 248 | } |
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| 249 | |
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[435] | 250 | // restore IRQs |
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| 251 | hal_restore_irq( save_sr ); |
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| 252 | |
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[407] | 253 | if( vseg == NULL ) |
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| 254 | { |
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[435] | 255 | |
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| 256 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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| 257 | printk("\n[ERROR] in %s : cannot create vseg\n", __FUNCTION__ ); |
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| 258 | #endif |
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[407] | 259 | this->errno = ENOMEM; |
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| 260 | return -1; |
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| 261 | } |
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| 262 | |
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| 263 | // copy vseg base address to user space |
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| 264 | hal_copy_to_uspace( &attr->addr , &vseg->min , sizeof(intptr_t) ); |
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| 265 | |
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[435] | 266 | hal_fence(); |
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[407] | 267 | |
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[435] | 268 | #if CONFIG_DEBUG_SYS_MMAP |
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| 269 | tm_end = hal_get_cycles(); |
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| 270 | if ( CONFIG_DEBUG_SYS_MMAP < tm_start ) |
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| 271 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n" |
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| 272 | "vseg %s / cluster %x / base %x / size %x / cost %d\n", |
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| 273 | __FUNCTION__, this, process->pid, (uint32_t)tm_end, |
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| 274 | vseg_type_str(vseg->type), vseg->cxy, vseg->min, length, (uint32_t)(tm_end - tm_start) ); |
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| 275 | #endif |
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[407] | 276 | |
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| 277 | return 0; |
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| 278 | |
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[23] | 279 | } // end sys_mmap() |
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[407] | 280 | |
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