1 | /* |
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2 | * sys_mmap.c - map files, memory or devices into process virtual address space |
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3 | * |
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4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012) |
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5 | * Alain Greiner (2016,2017,2018) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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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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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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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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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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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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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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25 | #include <hal_kernel_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 <shared_syscalls.h> |
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29 | #include <errno.h> |
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30 | #include <thread.h> |
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31 | #include <printk.h> |
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32 | #include <mapper.h> |
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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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37 | #include <syscalls.h> |
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38 | |
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39 | ////////////////////////////////// |
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40 | int sys_mmap( mmap_attr_t * attr ) |
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41 | { |
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42 | vseg_t * vseg; |
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43 | cxy_t vseg_cxy; |
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44 | vseg_type_t vseg_type; |
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45 | mmap_attr_t k_attr; // attributes copy in kernel space |
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46 | xptr_t mapper_xp; |
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47 | error_t error; |
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48 | reg_t save_sr; // required to enable IRQs |
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49 | |
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50 | thread_t * this = CURRENT_THREAD; |
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51 | process_t * process = this->process; |
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52 | |
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53 | #if DEBUG_SYS_MMAP |
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54 | uint64_t tm_start; |
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55 | uint64_t tm_end; |
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56 | tm_start = hal_get_cycles(); |
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57 | if ( DEBUG_SYS_MMAP < tm_start ) |
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58 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n", |
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59 | __FUNCTION__, this, process->pid, (uint32_t)tm_start ); |
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60 | #endif |
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61 | |
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62 | // check arguments in user space |
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63 | error = vmm_get_vseg( process , (intptr_t)attr , &vseg ); |
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64 | |
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65 | if ( error ) |
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66 | { |
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67 | |
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68 | #if DEBUG_SYSCALLS_ERROR |
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69 | printk("\n[ERROR] in %s : user buffer unmapped %x / thread %x / process %x\n", |
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70 | __FUNCTION__ , (intptr_t)attr , this->trdid , process->pid ); |
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71 | vmm_display( process , false ); |
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72 | #endif |
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73 | this->errno = EINVAL; |
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74 | return -1; |
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75 | } |
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76 | |
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77 | // copy arguments from uspace |
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78 | hal_copy_from_uspace( &k_attr , attr , sizeof(mmap_attr_t) ); |
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79 | |
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80 | // get fdid, offset, and length arguments |
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81 | uint32_t fdid = k_attr.fdid; |
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82 | uint32_t offset = k_attr.offset; |
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83 | uint32_t length = k_attr.length; |
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84 | |
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85 | // get flags |
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86 | bool_t map_fixed = ( (k_attr.flags & MAP_FIXED) != 0 ); |
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87 | bool_t map_anon = ( (k_attr.flags & MAP_ANON) != 0 ); |
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88 | bool_t map_remote = ( (k_attr.flags & MAP_REMOTE) != 0 ); |
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89 | bool_t map_shared = ( (k_attr.flags & MAP_SHARED) != 0 ); |
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90 | bool_t map_private = ( (k_attr.flags & MAP_PRIVATE) != 0 ); |
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91 | |
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92 | // MAP_FIXED not supported |
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93 | if( map_fixed ) |
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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 : MAP_FIXED not supported / thread %x / process %x\n", |
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98 | __FUNCTION__ , this->trdid , process->pid ); |
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99 | #endif |
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100 | this->errno = EINVAL; |
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101 | return -1; |
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102 | } |
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103 | |
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104 | if( map_shared == map_private ) |
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105 | { |
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106 | |
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107 | #if DEBUG_SYSCALLS_ERROR |
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108 | printk("\n[ERROR] in %s : MAP_SHARED == MAP_PRIVATE / thread %x / process %x\n", |
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109 | __FUNCTION__ , this->trdid , process->pid ); |
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110 | #endif |
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111 | this->errno = EINVAL; |
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112 | return -1; |
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113 | } |
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114 | |
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115 | // FIXME handle Copy_On_Write for MAP_PRIVATE... |
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116 | |
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117 | // get access rigths |
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118 | bool_t prot_read = ( (k_attr.prot & PROT_READ ) != 0 ); |
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119 | bool_t prot_write = ( (k_attr.prot & PROT_WRITE) != 0 ); |
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120 | |
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121 | // test mmap type : can be FILE / ANON / REMOTE |
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122 | |
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123 | if( (map_anon == false) && (map_remote == false) ) // FILE |
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124 | { |
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125 | // FIXME: handle concurent delete of file by another thread closing it |
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126 | |
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127 | if( fdid >= CONFIG_PROCESS_FILE_MAX_NR ) |
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128 | { |
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129 | |
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130 | #if DEBUG_SYSCALLS_ERROR |
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131 | printk("\n[ERROR] in %s: bad file descriptor %d / thread %x / process %x\n", |
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132 | __FUNCTION__ , fdid , this->trdid , process->pid ); |
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133 | #endif |
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134 | this->errno = EBADFD; |
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135 | return -1; |
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136 | } |
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137 | |
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138 | // get extended pointer on file descriptor |
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139 | xptr_t file_xp = process_fd_get_xptr( process , fdid ); |
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140 | |
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141 | if( file_xp == XPTR_NULL ) |
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142 | { |
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143 | |
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144 | #if DEBUG_SYSCALLS_ERROR |
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145 | printk("\n[ERROR] in %s: file %d not found / thread %x / process %x\n", |
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146 | __FUNCTION__ , fdid , this->trdid , process->pid ); |
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147 | #endif |
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148 | this->errno = EBADFD; |
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149 | return -1; |
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150 | } |
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151 | |
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152 | // get file cluster and local pointer |
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153 | cxy_t file_cxy = GET_CXY( file_xp ); |
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154 | vfs_file_t * file_ptr = (vfs_file_t *)GET_PTR( file_xp ); |
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155 | |
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156 | // get inode pointer, mapper pointer and file attributes |
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157 | vfs_inode_t * inode_ptr = hal_remote_lpt(XPTR(file_cxy , &file_ptr->inode )); |
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158 | uint32_t file_attr = hal_remote_lw (XPTR(file_cxy , &file_ptr->attr )); |
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159 | mapper_t * mapper_ptr = hal_remote_lpt(XPTR(file_cxy , &file_ptr->mapper)); |
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160 | |
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161 | // get file size |
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162 | uint32_t size = hal_remote_lw( XPTR( file_cxy , &inode_ptr->size ) ); |
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163 | |
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164 | // chek offset and length arguments |
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165 | if( (offset + length) > size) |
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166 | { |
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167 | |
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168 | #if DEBUG_SYSCALLS_ERROR |
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169 | printk("\n[ERROR] in %s: offset(%d) + len(%d) >= file's size(%d) / thread %x / process %x\n", |
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170 | __FUNCTION__, k_attr.offset, k_attr.length, size, this->trdid, process->pid ); |
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171 | #endif |
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172 | this->errno = ERANGE; |
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173 | return -1; |
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174 | } |
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175 | |
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176 | // check access rights |
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177 | if( (prot_read && !(file_attr & FD_ATTR_READ_ENABLE)) || |
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178 | (prot_write && !(file_attr & FD_ATTR_WRITE_ENABLE)) ) |
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179 | { |
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180 | |
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181 | #if DEBUG_SYSCALLS_ERROR |
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182 | printk("\n[ERROR] in %s: prot = %x / file_attr = %x / thread %x , process %x\n", |
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183 | __FUNCTION__ , k_attr.prot , file_attr , this->trdid , process->pid ); |
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184 | #endif |
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185 | this->errno = EACCES; |
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186 | return -1; |
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187 | } |
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188 | |
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189 | // increment file refcount |
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190 | vfs_file_count_up( file_xp ); |
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191 | |
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192 | mapper_xp = XPTR( file_cxy , mapper_ptr ); |
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193 | vseg_type = VSEG_TYPE_FILE; |
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194 | vseg_cxy = file_cxy; |
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195 | } |
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196 | else // ANON or REMOTE |
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197 | { |
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198 | // no mapper for ANON or REMOTE |
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199 | mapper_xp = XPTR_NULL; |
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200 | |
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201 | if( map_anon ) |
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202 | { |
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203 | vseg_type = VSEG_TYPE_ANON; |
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204 | vseg_cxy = local_cxy; |
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205 | } |
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206 | else |
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207 | { |
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208 | vseg_type = VSEG_TYPE_REMOTE; |
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209 | vseg_cxy = k_attr.fdid; |
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210 | |
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211 | if( cluster_is_undefined( vseg_cxy ) ) |
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212 | { |
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213 | |
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214 | #if DEBUG_SYSCALLS_ERROR |
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215 | printk("\n[ERROR] in %s : illegal cxy for MAP_REMOTE / thread %x / process %x\n", |
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216 | __FUNCTION__, this->trdid , process->pid ); |
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217 | #endif |
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218 | this->errno = EINVAL; |
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219 | return -1; |
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220 | } |
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221 | } |
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222 | } |
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223 | |
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224 | // enable IRQs |
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225 | hal_enable_irq( &save_sr ); |
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226 | |
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227 | // get reference process cluster and local pointer |
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228 | xptr_t ref_xp = process->ref_xp; |
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229 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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230 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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231 | |
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232 | // create the vseg in reference cluster |
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233 | if( local_cxy == ref_cxy ) |
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234 | { |
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235 | vseg = vmm_create_vseg( process, |
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236 | vseg_type, |
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237 | 0, // base address unused for mmap() |
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238 | length, |
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239 | offset, |
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240 | 0, // file_size unused for mmap() |
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241 | mapper_xp, |
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242 | vseg_cxy ); |
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243 | } |
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244 | else |
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245 | { |
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246 | rpc_vmm_create_vseg_client( ref_cxy, |
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247 | ref_ptr, |
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248 | vseg_type, |
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249 | 0, // base address unused for mmap() |
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250 | length, |
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251 | offset, |
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252 | 0, // file size unused for mmap() |
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253 | mapper_xp, |
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254 | vseg_cxy, |
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255 | &vseg ); |
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256 | } |
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257 | |
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258 | // restore IRQs |
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259 | hal_restore_irq( save_sr ); |
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260 | |
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261 | if( vseg == NULL ) |
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262 | { |
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263 | |
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264 | #if DEBUG_SYSCALLS_ERROR |
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265 | printk("\n[ERROR] in %s : cannot create vseg / thread %x / process %x\n", |
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266 | __FUNCTION__, this->trdid , process->pid ); |
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267 | #endif |
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268 | this->errno = ENOMEM; |
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269 | return -1; |
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270 | } |
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271 | |
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272 | // copy vseg base address to user space |
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273 | hal_copy_to_uspace( &attr->addr , &vseg->min , sizeof(intptr_t) ); |
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274 | |
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275 | hal_fence(); |
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276 | |
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277 | #if DEBUG_SYS_MMAP |
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278 | tm_end = hal_get_cycles(); |
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279 | if ( DEBUG_SYS_MMAP < tm_start ) |
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280 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n" |
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281 | "vseg %s / cluster %x / base %x / size %x / cost %d\n", |
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282 | __FUNCTION__, this, process->pid, (uint32_t)tm_end, |
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283 | vseg_type_str(vseg->type), vseg->cxy, vseg->min, length, (uint32_t)(tm_end - tm_start) ); |
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284 | #endif |
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285 | |
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286 | return 0; |
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287 | |
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288 | } // end sys_mmap() |
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289 | |
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