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1 | 54936004 | bellard | /*
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2 | 54936004 | bellard | * mmap support for qemu
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3 | 54936004 | bellard | *
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4 | 54936004 | bellard | * Copyright (c) 2003 Fabrice Bellard
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5 | 54936004 | bellard | *
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6 | 54936004 | bellard | * This program is free software; you can redistribute it and/or modify
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7 | 54936004 | bellard | * it under the terms of the GNU General Public License as published by
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8 | 54936004 | bellard | * the Free Software Foundation; either version 2 of the License, or
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9 | 54936004 | bellard | * (at your option) any later version.
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10 | 54936004 | bellard | *
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11 | 54936004 | bellard | * This program is distributed in the hope that it will be useful,
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12 | 54936004 | bellard | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 54936004 | bellard | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 54936004 | bellard | * GNU General Public License for more details.
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15 | 54936004 | bellard | *
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16 | 54936004 | bellard | * You should have received a copy of the GNU General Public License
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17 | 54936004 | bellard | * along with this program; if not, write to the Free Software
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18 | 54936004 | bellard | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | 54936004 | bellard | */
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20 | 54936004 | bellard | #include <stdlib.h> |
21 | 54936004 | bellard | #include <stdio.h> |
22 | 54936004 | bellard | #include <stdarg.h> |
23 | 54936004 | bellard | #include <string.h> |
24 | 54936004 | bellard | #include <unistd.h> |
25 | 54936004 | bellard | #include <errno.h> |
26 | 54936004 | bellard | #include <sys/mman.h> |
27 | 54936004 | bellard | |
28 | 54936004 | bellard | #include "qemu.h" |
29 | 54936004 | bellard | |
30 | 54936004 | bellard | //#define DEBUG_MMAP
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31 | 54936004 | bellard | |
32 | 54936004 | bellard | /* NOTE: all the constants are the HOST ones */
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33 | 54936004 | bellard | int target_mprotect(unsigned long start, unsigned long len, int prot) |
34 | 54936004 | bellard | { |
35 | 54936004 | bellard | unsigned long end, host_start, host_end, addr; |
36 | 54936004 | bellard | int prot1, ret;
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37 | 54936004 | bellard | |
38 | 54936004 | bellard | #ifdef DEBUG_MMAP
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39 | 54936004 | bellard | printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
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40 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
41 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
42 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
43 | 54936004 | bellard | #endif
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44 | 54936004 | bellard | |
45 | 54936004 | bellard | if ((start & ~TARGET_PAGE_MASK) != 0) |
46 | 54936004 | bellard | return -EINVAL;
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47 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
48 | 54936004 | bellard | end = start + len; |
49 | 54936004 | bellard | if (end < start)
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50 | 54936004 | bellard | return -EINVAL;
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51 | 54936004 | bellard | if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
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52 | 54936004 | bellard | return -EINVAL;
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53 | 54936004 | bellard | if (len == 0) |
54 | 54936004 | bellard | return 0; |
55 | 54936004 | bellard | |
56 | 54936004 | bellard | host_start = start & host_page_mask; |
57 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
58 | 54936004 | bellard | if (start > host_start) {
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59 | 54936004 | bellard | /* handle host page containing start */
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60 | 54936004 | bellard | prot1 = prot; |
61 | 54936004 | bellard | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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62 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
63 | 54936004 | bellard | } |
64 | d418c81e | bellard | if (host_end == host_start + host_page_size) {
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65 | d418c81e | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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66 | d418c81e | bellard | prot1 |= page_get_flags(addr); |
67 | d418c81e | bellard | } |
68 | d418c81e | bellard | end = host_end; |
69 | d418c81e | bellard | } |
70 | 54936004 | bellard | ret = mprotect((void *)host_start, host_page_size, prot1 & PAGE_BITS);
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71 | 54936004 | bellard | if (ret != 0) |
72 | 54936004 | bellard | return ret;
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73 | 54936004 | bellard | host_start += host_page_size; |
74 | 54936004 | bellard | } |
75 | 54936004 | bellard | if (end < host_end) {
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76 | 54936004 | bellard | prot1 = prot; |
77 | 54936004 | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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78 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
79 | 54936004 | bellard | } |
80 | 54936004 | bellard | ret = mprotect((void *)(host_end - host_page_size), host_page_size,
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81 | 54936004 | bellard | prot1 & PAGE_BITS); |
82 | 54936004 | bellard | if (ret != 0) |
83 | 54936004 | bellard | return ret;
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84 | 54936004 | bellard | host_end -= host_page_size; |
85 | 54936004 | bellard | } |
86 | 54936004 | bellard | |
87 | 54936004 | bellard | /* handle the pages in the middle */
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88 | 54936004 | bellard | if (host_start < host_end) {
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89 | 54936004 | bellard | ret = mprotect((void *)host_start, host_end - host_start, prot);
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90 | 54936004 | bellard | if (ret != 0) |
91 | 54936004 | bellard | return ret;
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92 | 54936004 | bellard | } |
93 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
94 | 54936004 | bellard | return 0; |
95 | 54936004 | bellard | } |
96 | 54936004 | bellard | |
97 | 54936004 | bellard | /* map an incomplete host page */
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98 | 54936004 | bellard | int mmap_frag(unsigned long host_start, |
99 | 54936004 | bellard | unsigned long start, unsigned long end, |
100 | 54936004 | bellard | int prot, int flags, int fd, unsigned long offset) |
101 | 54936004 | bellard | { |
102 | 54936004 | bellard | unsigned long host_end, ret, addr; |
103 | 54936004 | bellard | int prot1, prot_new;
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104 | 54936004 | bellard | |
105 | 54936004 | bellard | host_end = host_start + host_page_size; |
106 | 54936004 | bellard | |
107 | 54936004 | bellard | /* get the protection of the target pages outside the mapping */
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108 | 54936004 | bellard | prot1 = 0;
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109 | 54936004 | bellard | for(addr = host_start; addr < host_end; addr++) {
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110 | 54936004 | bellard | if (addr < start || addr >= end)
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111 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
112 | 54936004 | bellard | } |
113 | 54936004 | bellard | |
114 | 54936004 | bellard | if (prot1 == 0) { |
115 | 54936004 | bellard | /* no page was there, so we allocate one */
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116 | 54936004 | bellard | ret = (long)mmap((void *)host_start, host_page_size, prot, |
117 | 54936004 | bellard | flags | MAP_ANONYMOUS, -1, 0); |
118 | 54936004 | bellard | if (ret == -1) |
119 | 54936004 | bellard | return ret;
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120 | 54936004 | bellard | } |
121 | 54936004 | bellard | prot1 &= PAGE_BITS; |
122 | 54936004 | bellard | |
123 | 54936004 | bellard | prot_new = prot | prot1; |
124 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS)) {
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125 | 54936004 | bellard | /* msync() won't work here, so we return an error if write is
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126 | 54936004 | bellard | possible while it is a shared mapping */
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127 | 54936004 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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128 | 54936004 | bellard | (prot & PROT_WRITE)) |
129 | 54936004 | bellard | return -EINVAL;
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130 | 54936004 | bellard | |
131 | 54936004 | bellard | /* adjust protection to be able to read */
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132 | 54936004 | bellard | if (!(prot1 & PROT_WRITE))
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133 | 54936004 | bellard | mprotect((void *)host_start, host_page_size, prot1 | PROT_WRITE);
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134 | 54936004 | bellard | |
135 | 54936004 | bellard | /* read the corresponding file data */
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136 | 54936004 | bellard | pread(fd, (void *)start, end - start, offset);
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137 | 54936004 | bellard | |
138 | 54936004 | bellard | /* put final protection */
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139 | 54936004 | bellard | if (prot_new != (prot1 | PROT_WRITE))
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140 | 54936004 | bellard | mprotect((void *)host_start, host_page_size, prot_new);
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141 | 54936004 | bellard | } else {
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142 | 54936004 | bellard | /* just update the protection */
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143 | 54936004 | bellard | if (prot_new != prot1) {
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144 | 54936004 | bellard | mprotect((void *)host_start, host_page_size, prot_new);
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145 | 54936004 | bellard | } |
146 | 54936004 | bellard | } |
147 | 54936004 | bellard | return 0; |
148 | 54936004 | bellard | } |
149 | 54936004 | bellard | |
150 | 54936004 | bellard | /* NOTE: all the constants are the HOST ones */
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151 | 54936004 | bellard | long target_mmap(unsigned long start, unsigned long len, int prot, |
152 | 54936004 | bellard | int flags, int fd, unsigned long offset) |
153 | 54936004 | bellard | { |
154 | 54936004 | bellard | unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len; |
155 | 54936004 | bellard | |
156 | 54936004 | bellard | #ifdef DEBUG_MMAP
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157 | 54936004 | bellard | { |
158 | 54936004 | bellard | printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
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159 | 54936004 | bellard | start, len, |
160 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
161 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
162 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
163 | 54936004 | bellard | if (flags & MAP_FIXED)
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164 | 54936004 | bellard | printf("MAP_FIXED ");
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165 | 54936004 | bellard | if (flags & MAP_ANONYMOUS)
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166 | 54936004 | bellard | printf("MAP_ANON ");
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167 | 54936004 | bellard | switch(flags & MAP_TYPE) {
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168 | 54936004 | bellard | case MAP_PRIVATE:
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169 | 54936004 | bellard | printf("MAP_PRIVATE ");
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170 | 54936004 | bellard | break;
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171 | 54936004 | bellard | case MAP_SHARED:
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172 | 54936004 | bellard | printf("MAP_SHARED ");
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173 | 54936004 | bellard | break;
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174 | 54936004 | bellard | default:
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175 | 54936004 | bellard | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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176 | 54936004 | bellard | break;
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177 | 54936004 | bellard | } |
178 | 54936004 | bellard | printf("fd=%d offset=%lx\n", fd, offset);
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179 | 54936004 | bellard | } |
180 | 54936004 | bellard | #endif
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181 | 54936004 | bellard | |
182 | 54936004 | bellard | if (offset & ~TARGET_PAGE_MASK)
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183 | 54936004 | bellard | return -EINVAL;
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184 | 54936004 | bellard | |
185 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
186 | 54936004 | bellard | if (len == 0) |
187 | 54936004 | bellard | return start;
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188 | 54936004 | bellard | host_start = start & host_page_mask; |
189 | 54936004 | bellard | |
190 | 54936004 | bellard | if (!(flags & MAP_FIXED)) {
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191 | 54936004 | bellard | if (host_page_size != real_host_page_size) {
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192 | 54936004 | bellard | /* NOTE: this code is only for debugging with '-p' option */
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193 | 54936004 | bellard | /* reserve a memory area */
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194 | 54936004 | bellard | host_len = HOST_PAGE_ALIGN(len) + host_page_size - TARGET_PAGE_SIZE; |
195 | 54936004 | bellard | host_start = (long)mmap((void *)host_start, host_len, PROT_NONE, |
196 | 54936004 | bellard | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
197 | 54936004 | bellard | if (host_start == -1) |
198 | 54936004 | bellard | return host_start;
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199 | 54936004 | bellard | host_end = host_start + host_len; |
200 | 54936004 | bellard | start = HOST_PAGE_ALIGN(host_start); |
201 | 54936004 | bellard | end = start + HOST_PAGE_ALIGN(len); |
202 | 54936004 | bellard | if (start > host_start)
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203 | 54936004 | bellard | munmap((void *)host_start, start - host_start);
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204 | 54936004 | bellard | if (end < host_end)
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205 | 54936004 | bellard | munmap((void *)end, host_end - end);
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206 | 54936004 | bellard | /* use it as a fixed mapping */
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207 | 54936004 | bellard | flags |= MAP_FIXED; |
208 | 54936004 | bellard | } else {
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209 | 54936004 | bellard | /* if not fixed, no need to do anything */
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210 | 54936004 | bellard | host_offset = offset & host_page_mask; |
211 | 54936004 | bellard | host_len = len + offset - host_offset; |
212 | 54936004 | bellard | start = (long)mmap((void *)host_start, host_len, |
213 | 54936004 | bellard | prot, flags, fd, host_offset); |
214 | 54936004 | bellard | if (start == -1) |
215 | 54936004 | bellard | return start;
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216 | 54936004 | bellard | /* update start so that it points to the file position at 'offset' */
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217 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS))
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218 | 54936004 | bellard | start += offset - host_offset; |
219 | 54936004 | bellard | goto the_end1;
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220 | 54936004 | bellard | } |
221 | 54936004 | bellard | } |
222 | 54936004 | bellard | |
223 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
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224 | 54936004 | bellard | return -EINVAL;
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225 | 54936004 | bellard | end = start + len; |
226 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
227 | 54936004 | bellard | |
228 | 54936004 | bellard | /* worst case: we cannot map the file because the offset is not
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229 | 54936004 | bellard | aligned, so we read it */
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230 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS) &&
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231 | 54936004 | bellard | (offset & ~host_page_mask) != (start & ~host_page_mask)) { |
232 | 54936004 | bellard | /* msync() won't work here, so we return an error if write is
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233 | 54936004 | bellard | possible while it is a shared mapping */
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234 | 54936004 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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235 | 54936004 | bellard | (prot & PROT_WRITE)) |
236 | 54936004 | bellard | return -EINVAL;
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237 | 54936004 | bellard | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
238 | 54936004 | bellard | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
239 | 54936004 | bellard | -1, 0); |
240 | 54936004 | bellard | if (retaddr == -1) |
241 | 54936004 | bellard | return retaddr;
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242 | 54936004 | bellard | pread(fd, (void *)start, len, offset);
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243 | 54936004 | bellard | if (!(prot & PROT_WRITE)) {
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244 | 54936004 | bellard | ret = target_mprotect(start, len, prot); |
245 | 54936004 | bellard | if (ret != 0) |
246 | 54936004 | bellard | return ret;
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247 | 54936004 | bellard | } |
248 | 54936004 | bellard | goto the_end;
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249 | 54936004 | bellard | } |
250 | 54936004 | bellard | |
251 | 54936004 | bellard | /* handle the start of the mapping */
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252 | 54936004 | bellard | if (start > host_start) {
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253 | 54936004 | bellard | if (host_end == host_start + host_page_size) {
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254 | 54936004 | bellard | /* one single host page */
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255 | 54936004 | bellard | ret = mmap_frag(host_start, start, end, |
256 | 54936004 | bellard | prot, flags, fd, offset); |
257 | 54936004 | bellard | if (ret == -1) |
258 | 54936004 | bellard | return ret;
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259 | 54936004 | bellard | goto the_end1;
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260 | 54936004 | bellard | } |
261 | 54936004 | bellard | ret = mmap_frag(host_start, start, host_start + host_page_size, |
262 | 54936004 | bellard | prot, flags, fd, offset); |
263 | 54936004 | bellard | if (ret == -1) |
264 | 54936004 | bellard | return ret;
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265 | 54936004 | bellard | host_start += host_page_size; |
266 | 54936004 | bellard | } |
267 | 54936004 | bellard | /* handle the end of the mapping */
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268 | 54936004 | bellard | if (end < host_end) {
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269 | 54936004 | bellard | ret = mmap_frag(host_end - host_page_size, |
270 | 54936004 | bellard | host_end - host_page_size, host_end, |
271 | 54936004 | bellard | prot, flags, fd, |
272 | 54936004 | bellard | offset + host_end - host_page_size - start); |
273 | 54936004 | bellard | if (ret == -1) |
274 | 54936004 | bellard | return ret;
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275 | 54936004 | bellard | host_end -= host_page_size; |
276 | 54936004 | bellard | } |
277 | 54936004 | bellard | |
278 | 54936004 | bellard | /* map the middle (easier) */
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279 | 54936004 | bellard | if (host_start < host_end) {
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280 | 54936004 | bellard | ret = (long)mmap((void *)host_start, host_end - host_start, |
281 | 54936004 | bellard | prot, flags, fd, offset + host_start - start); |
282 | 54936004 | bellard | if (ret == -1) |
283 | 54936004 | bellard | return ret;
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284 | 54936004 | bellard | } |
285 | 54936004 | bellard | the_end1:
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286 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
287 | 54936004 | bellard | the_end:
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288 | 54936004 | bellard | #ifdef DEBUG_MMAP
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289 | 54936004 | bellard | page_dump(stdout); |
290 | 54936004 | bellard | printf("\n");
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291 | 54936004 | bellard | #endif
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292 | 54936004 | bellard | return start;
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293 | 54936004 | bellard | } |
294 | 54936004 | bellard | |
295 | 54936004 | bellard | int target_munmap(unsigned long start, unsigned long len) |
296 | 54936004 | bellard | { |
297 | 54936004 | bellard | unsigned long end, host_start, host_end, addr; |
298 | 54936004 | bellard | int prot, ret;
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299 | 54936004 | bellard | |
300 | 54936004 | bellard | #ifdef DEBUG_MMAP
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301 | 54936004 | bellard | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
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302 | 54936004 | bellard | #endif
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303 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
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304 | 54936004 | bellard | return -EINVAL;
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305 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
306 | 54936004 | bellard | if (len == 0) |
307 | 54936004 | bellard | return -EINVAL;
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308 | 54936004 | bellard | end = start + len; |
309 | 54936004 | bellard | host_start = start & host_page_mask; |
310 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
311 | 54936004 | bellard | |
312 | 54936004 | bellard | if (start > host_start) {
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313 | 54936004 | bellard | /* handle host page containing start */
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314 | 54936004 | bellard | prot = 0;
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315 | 54936004 | bellard | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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316 | 54936004 | bellard | prot |= page_get_flags(addr); |
317 | 54936004 | bellard | } |
318 | d418c81e | bellard | if (host_end == host_start + host_page_size) {
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319 | d418c81e | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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320 | d418c81e | bellard | prot |= page_get_flags(addr); |
321 | d418c81e | bellard | } |
322 | d418c81e | bellard | end = host_end; |
323 | d418c81e | bellard | } |
324 | 54936004 | bellard | if (prot != 0) |
325 | 54936004 | bellard | host_start += host_page_size; |
326 | 54936004 | bellard | } |
327 | 54936004 | bellard | if (end < host_end) {
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328 | 54936004 | bellard | prot = 0;
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329 | 54936004 | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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330 | 54936004 | bellard | prot |= page_get_flags(addr); |
331 | 54936004 | bellard | } |
332 | 54936004 | bellard | if (prot != 0) |
333 | 54936004 | bellard | host_end -= host_page_size; |
334 | 54936004 | bellard | } |
335 | 54936004 | bellard | |
336 | 54936004 | bellard | /* unmap what we can */
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337 | 54936004 | bellard | if (host_start < host_end) {
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338 | 54936004 | bellard | ret = munmap((void *)host_start, host_end - host_start);
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339 | 54936004 | bellard | if (ret != 0) |
340 | 54936004 | bellard | return ret;
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341 | 54936004 | bellard | } |
342 | 54936004 | bellard | |
343 | 54936004 | bellard | page_set_flags(start, start + len, 0);
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344 | 54936004 | bellard | return 0; |
345 | 54936004 | bellard | } |
346 | 54936004 | bellard | |
347 | 54936004 | bellard | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
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348 | 54936004 | bellard | blocks which have been allocated starting on a host page */
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349 | 54936004 | bellard | long target_mremap(unsigned long old_addr, unsigned long old_size, |
350 | 54936004 | bellard | unsigned long new_size, unsigned long flags, |
351 | 54936004 | bellard | unsigned long new_addr) |
352 | 54936004 | bellard | { |
353 | 54936004 | bellard | int prot;
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354 | 54936004 | bellard | |
355 | 54936004 | bellard | /* XXX: use 5 args syscall */
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356 | 54936004 | bellard | new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags); |
357 | 54936004 | bellard | if (new_addr == -1) |
358 | 54936004 | bellard | return new_addr;
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359 | 54936004 | bellard | prot = page_get_flags(old_addr); |
360 | 54936004 | bellard | page_set_flags(old_addr, old_addr + old_size, 0);
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361 | 54936004 | bellard | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
362 | 54936004 | bellard | return new_addr;
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363 | 54936004 | bellard | } |
364 | 54936004 | bellard | |
365 | 54936004 | bellard | int target_msync(unsigned long start, unsigned long len, int flags) |
366 | 54936004 | bellard | { |
367 | 54936004 | bellard | unsigned long end; |
368 | 54936004 | bellard | |
369 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
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370 | 54936004 | bellard | return -EINVAL;
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371 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
372 | 54936004 | bellard | end = start + len; |
373 | d418c81e | bellard | if (end < start)
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374 | d418c81e | bellard | return -EINVAL;
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375 | d418c81e | bellard | if (end == start)
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376 | d418c81e | bellard | return 0; |
377 | 54936004 | bellard | |
378 | 54936004 | bellard | start &= host_page_mask; |
379 | d418c81e | bellard | return msync((void *)start, end - start, flags); |
380 | 54936004 | bellard | } |