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1 | 831b7825 | ths | /*
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2 | 831b7825 | ths | * mmap support for qemu
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3 | 831b7825 | ths | *
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4 | 831b7825 | ths | * Copyright (c) 2003 Fabrice Bellard
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5 | 831b7825 | ths | *
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6 | 831b7825 | ths | * This program is free software; you can redistribute it and/or modify
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7 | 831b7825 | ths | * it under the terms of the GNU General Public License as published by
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8 | 831b7825 | ths | * the Free Software Foundation; either version 2 of the License, or
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9 | 831b7825 | ths | * (at your option) any later version.
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10 | 831b7825 | ths | *
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11 | 831b7825 | ths | * This program is distributed in the hope that it will be useful,
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12 | 831b7825 | ths | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 831b7825 | ths | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 831b7825 | ths | * GNU General Public License for more details.
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15 | 831b7825 | ths | *
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16 | 831b7825 | ths | * You should have received a copy of the GNU General Public License
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17 | 8167ee88 | Blue Swirl | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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18 | 831b7825 | ths | */
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19 | 831b7825 | ths | #include <stdlib.h> |
20 | 831b7825 | ths | #include <stdio.h> |
21 | 831b7825 | ths | #include <stdarg.h> |
22 | 831b7825 | ths | #include <string.h> |
23 | 831b7825 | ths | #include <unistd.h> |
24 | 831b7825 | ths | #include <errno.h> |
25 | 831b7825 | ths | #include <sys/mman.h> |
26 | 831b7825 | ths | |
27 | 831b7825 | ths | #include "qemu.h" |
28 | 831b7825 | ths | |
29 | 831b7825 | ths | //#define DEBUG_MMAP
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30 | 831b7825 | ths | |
31 | 831b7825 | ths | /* NOTE: all the constants are the HOST ones */
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32 | 831b7825 | ths | int target_mprotect(unsigned long start, unsigned long len, int prot) |
33 | 831b7825 | ths | { |
34 | 831b7825 | ths | unsigned long end, host_start, host_end, addr; |
35 | 831b7825 | ths | int prot1, ret;
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36 | 831b7825 | ths | |
37 | 831b7825 | ths | #ifdef DEBUG_MMAP
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38 | 831b7825 | ths | printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
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39 | 831b7825 | ths | prot & PROT_READ ? 'r' : '-', |
40 | 831b7825 | ths | prot & PROT_WRITE ? 'w' : '-', |
41 | 831b7825 | ths | prot & PROT_EXEC ? 'x' : '-'); |
42 | 831b7825 | ths | #endif
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43 | 831b7825 | ths | |
44 | 831b7825 | ths | if ((start & ~TARGET_PAGE_MASK) != 0) |
45 | 831b7825 | ths | return -EINVAL;
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46 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
47 | 831b7825 | ths | end = start + len; |
48 | 831b7825 | ths | if (end < start)
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49 | 831b7825 | ths | return -EINVAL;
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50 | 831b7825 | ths | if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
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51 | 831b7825 | ths | return -EINVAL;
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52 | 831b7825 | ths | if (len == 0) |
53 | 831b7825 | ths | return 0; |
54 | 831b7825 | ths | |
55 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
56 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
57 | 831b7825 | ths | if (start > host_start) {
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58 | 831b7825 | ths | /* handle host page containing start */
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59 | 831b7825 | ths | prot1 = prot; |
60 | 831b7825 | ths | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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61 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
62 | 831b7825 | ths | } |
63 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
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64 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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65 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
66 | 831b7825 | ths | } |
67 | 831b7825 | ths | end = host_end; |
68 | 831b7825 | ths | } |
69 | 831b7825 | ths | ret = mprotect((void *)host_start, qemu_host_page_size, prot1 & PAGE_BITS);
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70 | 831b7825 | ths | if (ret != 0) |
71 | 831b7825 | ths | return ret;
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72 | 831b7825 | ths | host_start += qemu_host_page_size; |
73 | 831b7825 | ths | } |
74 | 831b7825 | ths | if (end < host_end) {
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75 | 831b7825 | ths | prot1 = prot; |
76 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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77 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
78 | 831b7825 | ths | } |
79 | 831b7825 | ths | ret = mprotect((void *)(host_end - qemu_host_page_size), qemu_host_page_size,
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80 | 831b7825 | ths | prot1 & PAGE_BITS); |
81 | 831b7825 | ths | if (ret != 0) |
82 | 831b7825 | ths | return ret;
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83 | 831b7825 | ths | host_end -= qemu_host_page_size; |
84 | 831b7825 | ths | } |
85 | 831b7825 | ths | |
86 | 831b7825 | ths | /* handle the pages in the middle */
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87 | 831b7825 | ths | if (host_start < host_end) {
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88 | 831b7825 | ths | ret = mprotect((void *)host_start, host_end - host_start, prot);
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89 | 831b7825 | ths | if (ret != 0) |
90 | 831b7825 | ths | return ret;
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91 | 831b7825 | ths | } |
92 | 831b7825 | ths | page_set_flags(start, start + len, prot | PAGE_VALID); |
93 | 831b7825 | ths | return 0; |
94 | 831b7825 | ths | } |
95 | 831b7825 | ths | |
96 | 831b7825 | ths | /* map an incomplete host page */
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97 | 831b7825 | ths | int mmap_frag(unsigned long host_start, |
98 | 831b7825 | ths | unsigned long start, unsigned long end, |
99 | 831b7825 | ths | int prot, int flags, int fd, unsigned long offset) |
100 | 831b7825 | ths | { |
101 | 831b7825 | ths | unsigned long host_end, ret, addr; |
102 | 831b7825 | ths | int prot1, prot_new;
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103 | 831b7825 | ths | |
104 | 831b7825 | ths | host_end = host_start + qemu_host_page_size; |
105 | 831b7825 | ths | |
106 | 831b7825 | ths | /* get the protection of the target pages outside the mapping */
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107 | 831b7825 | ths | prot1 = 0;
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108 | 831b7825 | ths | for(addr = host_start; addr < host_end; addr++) {
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109 | 831b7825 | ths | if (addr < start || addr >= end)
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110 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
111 | 831b7825 | ths | } |
112 | 831b7825 | ths | |
113 | 831b7825 | ths | if (prot1 == 0) { |
114 | 831b7825 | ths | /* no page was there, so we allocate one */
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115 | 831b7825 | ths | ret = (long)mmap((void *)host_start, qemu_host_page_size, prot, |
116 | 831b7825 | ths | flags | MAP_ANONYMOUS, -1, 0); |
117 | 831b7825 | ths | if (ret == -1) |
118 | 831b7825 | ths | return ret;
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119 | 831b7825 | ths | } |
120 | 831b7825 | ths | prot1 &= PAGE_BITS; |
121 | 831b7825 | ths | |
122 | 831b7825 | ths | prot_new = prot | prot1; |
123 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS)) {
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124 | 831b7825 | ths | /* msync() won't work here, so we return an error if write is
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125 | 831b7825 | ths | possible while it is a shared mapping */
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126 | 831b7825 | ths | #ifndef __APPLE__
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127 | 831b7825 | ths | if ((flags & MAP_TYPE) == MAP_SHARED &&
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128 | 831b7825 | ths | #else
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129 | 831b7825 | ths | if ((flags & MAP_SHARED) &&
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130 | 831b7825 | ths | #endif
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131 | 831b7825 | ths | (prot & PROT_WRITE)) |
132 | 831b7825 | ths | return -EINVAL;
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133 | 831b7825 | ths | |
134 | 831b7825 | ths | /* adjust protection to be able to read */
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135 | 831b7825 | ths | if (!(prot1 & PROT_WRITE))
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136 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot1 | PROT_WRITE);
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137 | 831b7825 | ths | |
138 | 831b7825 | ths | /* read the corresponding file data */
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139 | 831b7825 | ths | pread(fd, (void *)start, end - start, offset);
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140 | 831b7825 | ths | |
141 | 831b7825 | ths | /* put final protection */
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142 | 831b7825 | ths | if (prot_new != (prot1 | PROT_WRITE))
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143 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot_new);
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144 | 831b7825 | ths | } else {
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145 | 831b7825 | ths | /* just update the protection */
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146 | 831b7825 | ths | if (prot_new != prot1) {
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147 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot_new);
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148 | 831b7825 | ths | } |
149 | 831b7825 | ths | } |
150 | 831b7825 | ths | return 0; |
151 | 831b7825 | ths | } |
152 | 831b7825 | ths | |
153 | 831b7825 | ths | /* NOTE: all the constants are the HOST ones */
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154 | 831b7825 | ths | long target_mmap(unsigned long start, unsigned long len, int prot, |
155 | 831b7825 | ths | int flags, int fd, unsigned long offset) |
156 | 831b7825 | ths | { |
157 | 831b7825 | ths | unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len; |
158 | 831b7825 | ths | #if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
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159 | 831b7825 | ths | static unsigned long last_start = 0x40000000; |
160 | 831b7825 | ths | #endif
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161 | 831b7825 | ths | |
162 | 831b7825 | ths | #ifdef DEBUG_MMAP
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163 | 831b7825 | ths | { |
164 | 831b7825 | ths | printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
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165 | 831b7825 | ths | start, len, |
166 | 831b7825 | ths | prot & PROT_READ ? 'r' : '-', |
167 | 831b7825 | ths | prot & PROT_WRITE ? 'w' : '-', |
168 | 831b7825 | ths | prot & PROT_EXEC ? 'x' : '-'); |
169 | 831b7825 | ths | if (flags & MAP_FIXED)
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170 | 831b7825 | ths | printf("MAP_FIXED ");
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171 | 831b7825 | ths | if (flags & MAP_ANONYMOUS)
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172 | 831b7825 | ths | printf("MAP_ANON ");
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173 | 831b7825 | ths | #ifndef MAP_TYPE
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174 | 831b7825 | ths | # define MAP_TYPE 0x3 |
175 | 831b7825 | ths | #endif
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176 | 831b7825 | ths | switch(flags & MAP_TYPE) {
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177 | 831b7825 | ths | case MAP_PRIVATE:
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178 | 831b7825 | ths | printf("MAP_PRIVATE ");
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179 | 831b7825 | ths | break;
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180 | 831b7825 | ths | case MAP_SHARED:
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181 | 831b7825 | ths | printf("MAP_SHARED ");
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182 | 831b7825 | ths | break;
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183 | 831b7825 | ths | default:
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184 | 831b7825 | ths | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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185 | 831b7825 | ths | break;
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186 | 831b7825 | ths | } |
187 | 831b7825 | ths | printf("fd=%d offset=%lx\n", fd, offset);
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188 | 831b7825 | ths | } |
189 | 831b7825 | ths | #endif
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190 | 831b7825 | ths | |
191 | 831b7825 | ths | if (offset & ~TARGET_PAGE_MASK)
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192 | 831b7825 | ths | return -EINVAL;
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193 | 831b7825 | ths | |
194 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
195 | 831b7825 | ths | if (len == 0) |
196 | 831b7825 | ths | return start;
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197 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
198 | 831b7825 | ths | |
199 | 831b7825 | ths | if (!(flags & MAP_FIXED)) {
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200 | 831b7825 | ths | #if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
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201 | e91c8a77 | ths | /* tell the kernel to search at the same place as i386 */
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202 | 831b7825 | ths | if (host_start == 0) { |
203 | 831b7825 | ths | host_start = last_start; |
204 | 831b7825 | ths | last_start += HOST_PAGE_ALIGN(len); |
205 | 831b7825 | ths | } |
206 | 831b7825 | ths | #endif
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207 | 831b7825 | ths | if (qemu_host_page_size != qemu_real_host_page_size) {
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208 | 831b7825 | ths | /* NOTE: this code is only for debugging with '-p' option */
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209 | 831b7825 | ths | /* reserve a memory area */
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210 | 831b7825 | ths | host_len = HOST_PAGE_ALIGN(len) + qemu_host_page_size - TARGET_PAGE_SIZE; |
211 | 831b7825 | ths | host_start = (long)mmap((void *)host_start, host_len, PROT_NONE, |
212 | 831b7825 | ths | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
213 | 831b7825 | ths | if (host_start == -1) |
214 | 831b7825 | ths | return host_start;
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215 | 831b7825 | ths | host_end = host_start + host_len; |
216 | 831b7825 | ths | start = HOST_PAGE_ALIGN(host_start); |
217 | 831b7825 | ths | end = start + HOST_PAGE_ALIGN(len); |
218 | 831b7825 | ths | if (start > host_start)
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219 | 831b7825 | ths | munmap((void *)host_start, start - host_start);
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220 | 831b7825 | ths | if (end < host_end)
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221 | 831b7825 | ths | munmap((void *)end, host_end - end);
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222 | 831b7825 | ths | /* use it as a fixed mapping */
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223 | 831b7825 | ths | flags |= MAP_FIXED; |
224 | 831b7825 | ths | } else {
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225 | 831b7825 | ths | /* if not fixed, no need to do anything */
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226 | 831b7825 | ths | host_offset = offset & qemu_host_page_mask; |
227 | 831b7825 | ths | host_len = len + offset - host_offset; |
228 | 831b7825 | ths | start = (long)mmap((void *)host_start, host_len, |
229 | 831b7825 | ths | prot, flags, fd, host_offset); |
230 | 831b7825 | ths | if (start == -1) |
231 | 831b7825 | ths | return start;
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232 | 831b7825 | ths | /* update start so that it points to the file position at 'offset' */
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233 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS))
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234 | 831b7825 | ths | start += offset - host_offset; |
235 | 831b7825 | ths | goto the_end1;
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236 | 831b7825 | ths | } |
237 | 831b7825 | ths | } |
238 | 831b7825 | ths | |
239 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
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240 | 831b7825 | ths | return -EINVAL;
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241 | 831b7825 | ths | end = start + len; |
242 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
243 | 831b7825 | ths | |
244 | 831b7825 | ths | /* worst case: we cannot map the file because the offset is not
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245 | 831b7825 | ths | aligned, so we read it */
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246 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS) &&
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247 | 831b7825 | ths | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
248 | 831b7825 | ths | /* msync() won't work here, so we return an error if write is
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249 | 831b7825 | ths | possible while it is a shared mapping */
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250 | 831b7825 | ths | #ifndef __APPLE__
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251 | 831b7825 | ths | if ((flags & MAP_TYPE) == MAP_SHARED &&
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252 | 831b7825 | ths | #else
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253 | 831b7825 | ths | if ((flags & MAP_SHARED) &&
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254 | 831b7825 | ths | #endif
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255 | 831b7825 | ths | (prot & PROT_WRITE)) |
256 | 831b7825 | ths | return -EINVAL;
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257 | 831b7825 | ths | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
258 | 831b7825 | ths | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
259 | 831b7825 | ths | -1, 0); |
260 | 831b7825 | ths | if (retaddr == -1) |
261 | 831b7825 | ths | return retaddr;
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262 | 831b7825 | ths | pread(fd, (void *)start, len, offset);
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263 | 831b7825 | ths | if (!(prot & PROT_WRITE)) {
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264 | 831b7825 | ths | ret = target_mprotect(start, len, prot); |
265 | 831b7825 | ths | if (ret != 0) |
266 | 831b7825 | ths | return ret;
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267 | 831b7825 | ths | } |
268 | 831b7825 | ths | goto the_end;
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269 | 831b7825 | ths | } |
270 | 831b7825 | ths | |
271 | 831b7825 | ths | /* handle the start of the mapping */
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272 | 831b7825 | ths | if (start > host_start) {
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273 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
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274 | 831b7825 | ths | /* one single host page */
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275 | 831b7825 | ths | ret = mmap_frag(host_start, start, end, |
276 | 831b7825 | ths | prot, flags, fd, offset); |
277 | 831b7825 | ths | if (ret == -1) |
278 | 831b7825 | ths | return ret;
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279 | 831b7825 | ths | goto the_end1;
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280 | 831b7825 | ths | } |
281 | 831b7825 | ths | ret = mmap_frag(host_start, start, host_start + qemu_host_page_size, |
282 | 831b7825 | ths | prot, flags, fd, offset); |
283 | 831b7825 | ths | if (ret == -1) |
284 | 831b7825 | ths | return ret;
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285 | 831b7825 | ths | host_start += qemu_host_page_size; |
286 | 831b7825 | ths | } |
287 | 831b7825 | ths | /* handle the end of the mapping */
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288 | 831b7825 | ths | if (end < host_end) {
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289 | 831b7825 | ths | ret = mmap_frag(host_end - qemu_host_page_size, |
290 | 831b7825 | ths | host_end - qemu_host_page_size, host_end, |
291 | 831b7825 | ths | prot, flags, fd, |
292 | 831b7825 | ths | offset + host_end - qemu_host_page_size - start); |
293 | 831b7825 | ths | if (ret == -1) |
294 | 831b7825 | ths | return ret;
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295 | 831b7825 | ths | host_end -= qemu_host_page_size; |
296 | 831b7825 | ths | } |
297 | 831b7825 | ths | |
298 | 831b7825 | ths | /* map the middle (easier) */
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299 | 831b7825 | ths | if (host_start < host_end) {
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300 | 831b7825 | ths | unsigned long offset1; |
301 | 831b7825 | ths | if (flags & MAP_ANONYMOUS)
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302 | 831b7825 | ths | offset1 = 0;
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303 | 831b7825 | ths | else
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304 | 831b7825 | ths | offset1 = offset + host_start - start; |
305 | 831b7825 | ths | ret = (long)mmap((void *)host_start, host_end - host_start, |
306 | 831b7825 | ths | prot, flags, fd, offset1); |
307 | 831b7825 | ths | if (ret == -1) |
308 | 831b7825 | ths | return ret;
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309 | 831b7825 | ths | } |
310 | 831b7825 | ths | the_end1:
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311 | 831b7825 | ths | page_set_flags(start, start + len, prot | PAGE_VALID); |
312 | 831b7825 | ths | the_end:
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313 | 831b7825 | ths | #ifdef DEBUG_MMAP
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314 | 831b7825 | ths | printf("target_mmap: ret=0x%lx\n", (long)start); |
315 | 831b7825 | ths | page_dump(stdout); |
316 | 831b7825 | ths | printf("\n");
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317 | 831b7825 | ths | #endif
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318 | 831b7825 | ths | return start;
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319 | 831b7825 | ths | } |
320 | 831b7825 | ths | |
321 | 831b7825 | ths | int target_munmap(unsigned long start, unsigned long len) |
322 | 831b7825 | ths | { |
323 | 831b7825 | ths | unsigned long end, host_start, host_end, addr; |
324 | 831b7825 | ths | int prot, ret;
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325 | 831b7825 | ths | |
326 | 831b7825 | ths | #ifdef DEBUG_MMAP
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327 | 831b7825 | ths | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
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328 | 831b7825 | ths | #endif
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329 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
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330 | 831b7825 | ths | return -EINVAL;
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331 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
332 | 831b7825 | ths | if (len == 0) |
333 | 831b7825 | ths | return -EINVAL;
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334 | 831b7825 | ths | end = start + len; |
335 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
336 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
337 | 831b7825 | ths | |
338 | 831b7825 | ths | if (start > host_start) {
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339 | 831b7825 | ths | /* handle host page containing start */
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340 | 831b7825 | ths | prot = 0;
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341 | 831b7825 | ths | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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342 | 831b7825 | ths | prot |= page_get_flags(addr); |
343 | 831b7825 | ths | } |
344 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
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345 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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346 | 831b7825 | ths | prot |= page_get_flags(addr); |
347 | 831b7825 | ths | } |
348 | 831b7825 | ths | end = host_end; |
349 | 831b7825 | ths | } |
350 | 831b7825 | ths | if (prot != 0) |
351 | 831b7825 | ths | host_start += qemu_host_page_size; |
352 | 831b7825 | ths | } |
353 | 831b7825 | ths | if (end < host_end) {
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354 | 831b7825 | ths | prot = 0;
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355 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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356 | 831b7825 | ths | prot |= page_get_flags(addr); |
357 | 831b7825 | ths | } |
358 | 831b7825 | ths | if (prot != 0) |
359 | 831b7825 | ths | host_end -= qemu_host_page_size; |
360 | 831b7825 | ths | } |
361 | 831b7825 | ths | |
362 | 831b7825 | ths | /* unmap what we can */
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363 | 831b7825 | ths | if (host_start < host_end) {
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364 | 831b7825 | ths | ret = munmap((void *)host_start, host_end - host_start);
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365 | 831b7825 | ths | if (ret != 0) |
366 | 831b7825 | ths | return ret;
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367 | 831b7825 | ths | } |
368 | 831b7825 | ths | |
369 | 831b7825 | ths | page_set_flags(start, start + len, 0);
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370 | 831b7825 | ths | return 0; |
371 | 831b7825 | ths | } |
372 | 831b7825 | ths | |
373 | 831b7825 | ths | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
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374 | 831b7825 | ths | blocks which have been allocated starting on a host page */
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375 | 831b7825 | ths | long target_mremap(unsigned long old_addr, unsigned long old_size, |
376 | 831b7825 | ths | unsigned long new_size, unsigned long flags, |
377 | 831b7825 | ths | unsigned long new_addr) |
378 | 831b7825 | ths | { |
379 | 831b7825 | ths | #ifndef __APPLE__
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380 | 831b7825 | ths | /* XXX: use 5 args syscall */
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381 | 831b7825 | ths | new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags); |
382 | 831b7825 | ths | if (new_addr == -1) |
383 | 831b7825 | ths | return new_addr;
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384 | 831b7825 | ths | prot = page_get_flags(old_addr); |
385 | 831b7825 | ths | page_set_flags(old_addr, old_addr + old_size, 0);
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386 | 831b7825 | ths | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
387 | 831b7825 | ths | return new_addr;
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388 | 831b7825 | ths | #else
|
389 | 831b7825 | ths | qerror("target_mremap: unsupported\n");
|
390 | 831b7825 | ths | #endif
|
391 | 831b7825 | ths | |
392 | 831b7825 | ths | } |
393 | 831b7825 | ths | |
394 | 831b7825 | ths | int target_msync(unsigned long start, unsigned long len, int flags) |
395 | 831b7825 | ths | { |
396 | 831b7825 | ths | unsigned long end; |
397 | 831b7825 | ths | |
398 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
|
399 | 831b7825 | ths | return -EINVAL;
|
400 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
401 | 831b7825 | ths | end = start + len; |
402 | 831b7825 | ths | if (end < start)
|
403 | 831b7825 | ths | return -EINVAL;
|
404 | 831b7825 | ths | if (end == start)
|
405 | 831b7825 | ths | return 0; |
406 | 831b7825 | ths | |
407 | 831b7825 | ths | start &= qemu_host_page_mask; |
408 | 831b7825 | ths | return msync((void *)start, end - start, flags); |
409 | 831b7825 | ths | } |