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1 | 54936004 | bellard | /*
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2 | 54936004 | bellard | * mmap support for qemu
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3 | 5fafdf24 | ths | *
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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 | c8a706fe | pbrook | #if defined(USE_NPTL)
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33 | c8a706fe | pbrook | pthread_mutex_t mmap_mutex; |
34 | c8a706fe | pbrook | static int __thread mmap_lock_count; |
35 | c8a706fe | pbrook | |
36 | c8a706fe | pbrook | void mmap_lock(void) |
37 | c8a706fe | pbrook | { |
38 | c8a706fe | pbrook | if (mmap_lock_count++ == 0) { |
39 | c8a706fe | pbrook | pthread_mutex_lock(&mmap_mutex); |
40 | c8a706fe | pbrook | } |
41 | c8a706fe | pbrook | } |
42 | c8a706fe | pbrook | |
43 | c8a706fe | pbrook | void mmap_unlock(void) |
44 | c8a706fe | pbrook | { |
45 | c8a706fe | pbrook | if (--mmap_lock_count == 0) { |
46 | c8a706fe | pbrook | pthread_mutex_unlock(&mmap_mutex); |
47 | c8a706fe | pbrook | } |
48 | c8a706fe | pbrook | } |
49 | d5975363 | pbrook | |
50 | d5975363 | pbrook | /* Grab lock to make sure things are in a consistent state after fork(). */
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51 | d5975363 | pbrook | void mmap_fork_start(void) |
52 | d5975363 | pbrook | { |
53 | d5975363 | pbrook | if (mmap_lock_count)
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54 | d5975363 | pbrook | abort(); |
55 | d5975363 | pbrook | pthread_mutex_lock(&mmap_mutex); |
56 | d5975363 | pbrook | } |
57 | d5975363 | pbrook | |
58 | d5975363 | pbrook | void mmap_fork_end(int child) |
59 | d5975363 | pbrook | { |
60 | d5975363 | pbrook | if (child)
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61 | d5975363 | pbrook | pthread_mutex_init(&mmap_mutex, NULL);
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62 | d5975363 | pbrook | else
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63 | d5975363 | pbrook | pthread_mutex_unlock(&mmap_mutex); |
64 | d5975363 | pbrook | } |
65 | c8a706fe | pbrook | #else
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66 | c8a706fe | pbrook | /* We aren't threadsafe to start with, so no need to worry about locking. */
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67 | c8a706fe | pbrook | void mmap_lock(void) |
68 | c8a706fe | pbrook | { |
69 | c8a706fe | pbrook | } |
70 | c8a706fe | pbrook | |
71 | c8a706fe | pbrook | void mmap_unlock(void) |
72 | c8a706fe | pbrook | { |
73 | c8a706fe | pbrook | } |
74 | c8a706fe | pbrook | #endif
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75 | c8a706fe | pbrook | |
76 | 17e2377a | pbrook | void *qemu_vmalloc(size_t size)
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77 | 17e2377a | pbrook | { |
78 | 17e2377a | pbrook | void *p;
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79 | 17e2377a | pbrook | unsigned long addr; |
80 | 17e2377a | pbrook | mmap_lock(); |
81 | 17e2377a | pbrook | /* Use map and mark the pages as used. */
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82 | 17e2377a | pbrook | p = mmap(NULL, size, PROT_READ | PROT_WRITE,
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83 | 17e2377a | pbrook | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
84 | 17e2377a | pbrook | |
85 | 17e2377a | pbrook | addr = (unsigned long)p; |
86 | 17e2377a | pbrook | if (addr == (target_ulong) addr) {
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87 | 17e2377a | pbrook | /* Allocated region overlaps guest address space.
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88 | 17e2377a | pbrook | This may recurse. */
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89 | 17e2377a | pbrook | page_set_flags(addr & TARGET_PAGE_MASK, TARGET_PAGE_ALIGN(addr + size), |
90 | 17e2377a | pbrook | PAGE_RESERVED); |
91 | 17e2377a | pbrook | } |
92 | 17e2377a | pbrook | |
93 | 17e2377a | pbrook | mmap_unlock(); |
94 | 17e2377a | pbrook | return p;
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95 | 17e2377a | pbrook | } |
96 | 17e2377a | pbrook | |
97 | 17e2377a | pbrook | void *qemu_malloc(size_t size)
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98 | 17e2377a | pbrook | { |
99 | 17e2377a | pbrook | char * p;
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100 | 17e2377a | pbrook | size += 16;
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101 | 17e2377a | pbrook | p = qemu_vmalloc(size); |
102 | 17e2377a | pbrook | *(size_t *)p = size; |
103 | 17e2377a | pbrook | return p + 16; |
104 | 17e2377a | pbrook | } |
105 | 17e2377a | pbrook | |
106 | 17e2377a | pbrook | /* We use map, which is always zero initialized. */
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107 | 17e2377a | pbrook | void * qemu_mallocz(size_t size)
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108 | 17e2377a | pbrook | { |
109 | 17e2377a | pbrook | return qemu_malloc(size);
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110 | 17e2377a | pbrook | } |
111 | 17e2377a | pbrook | |
112 | 17e2377a | pbrook | void qemu_free(void *ptr) |
113 | 17e2377a | pbrook | { |
114 | 17e2377a | pbrook | /* FIXME: We should unmark the reserved pages here. However this gets
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115 | 17e2377a | pbrook | complicated when one target page spans multiple host pages, so we
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116 | 17e2377a | pbrook | don't bother. */
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117 | 17e2377a | pbrook | size_t *p; |
118 | 17e2377a | pbrook | p = (size_t *)((char *)ptr - 16); |
119 | 17e2377a | pbrook | munmap(p, *p); |
120 | 17e2377a | pbrook | } |
121 | 17e2377a | pbrook | |
122 | 53a5960a | pbrook | /* NOTE: all the constants are the HOST ones, but addresses are target. */
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123 | 992f48a0 | blueswir1 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
124 | 54936004 | bellard | { |
125 | 992f48a0 | blueswir1 | abi_ulong end, host_start, host_end, addr; |
126 | 54936004 | bellard | int prot1, ret;
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127 | 54936004 | bellard | |
128 | 54936004 | bellard | #ifdef DEBUG_MMAP
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129 | a5b85f79 | ths | printf("mprotect: start=0x" TARGET_FMT_lx
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130 | 80210bcd | ths | "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
131 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
132 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
133 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
134 | 54936004 | bellard | #endif
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135 | 54936004 | bellard | |
136 | 54936004 | bellard | if ((start & ~TARGET_PAGE_MASK) != 0) |
137 | 54936004 | bellard | return -EINVAL;
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138 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
139 | 54936004 | bellard | end = start + len; |
140 | 54936004 | bellard | if (end < start)
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141 | 54936004 | bellard | return -EINVAL;
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142 | 171cd1cd | balrog | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
143 | 54936004 | bellard | if (len == 0) |
144 | 54936004 | bellard | return 0; |
145 | 3b46e624 | ths | |
146 | c8a706fe | pbrook | mmap_lock(); |
147 | 83fb7adf | bellard | host_start = start & qemu_host_page_mask; |
148 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
149 | 54936004 | bellard | if (start > host_start) {
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150 | 54936004 | bellard | /* handle host page containing start */
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151 | 54936004 | bellard | prot1 = prot; |
152 | 54936004 | bellard | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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153 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
154 | 54936004 | bellard | } |
155 | 83fb7adf | bellard | if (host_end == host_start + qemu_host_page_size) {
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156 | d418c81e | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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157 | d418c81e | bellard | prot1 |= page_get_flags(addr); |
158 | d418c81e | bellard | } |
159 | d418c81e | bellard | end = host_end; |
160 | d418c81e | bellard | } |
161 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
162 | 54936004 | bellard | if (ret != 0) |
163 | c8a706fe | pbrook | goto error;
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164 | 83fb7adf | bellard | host_start += qemu_host_page_size; |
165 | 54936004 | bellard | } |
166 | 54936004 | bellard | if (end < host_end) {
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167 | 54936004 | bellard | prot1 = prot; |
168 | 54936004 | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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169 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
170 | 54936004 | bellard | } |
171 | 5fafdf24 | ths | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
172 | 54936004 | bellard | prot1 & PAGE_BITS); |
173 | 54936004 | bellard | if (ret != 0) |
174 | c8a706fe | pbrook | goto error;
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175 | 83fb7adf | bellard | host_end -= qemu_host_page_size; |
176 | 54936004 | bellard | } |
177 | 3b46e624 | ths | |
178 | 54936004 | bellard | /* handle the pages in the middle */
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179 | 54936004 | bellard | if (host_start < host_end) {
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180 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
181 | 54936004 | bellard | if (ret != 0) |
182 | c8a706fe | pbrook | goto error;
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183 | 54936004 | bellard | } |
184 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
185 | c8a706fe | pbrook | mmap_unlock(); |
186 | 54936004 | bellard | return 0; |
187 | c8a706fe | pbrook | error:
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188 | c8a706fe | pbrook | mmap_unlock(); |
189 | c8a706fe | pbrook | return ret;
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190 | 54936004 | bellard | } |
191 | 54936004 | bellard | |
192 | 54936004 | bellard | /* map an incomplete host page */
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193 | 992f48a0 | blueswir1 | static int mmap_frag(abi_ulong real_start, |
194 | 992f48a0 | blueswir1 | abi_ulong start, abi_ulong end, |
195 | 992f48a0 | blueswir1 | int prot, int flags, int fd, abi_ulong offset) |
196 | 54936004 | bellard | { |
197 | 80210bcd | ths | abi_ulong real_end, addr; |
198 | 53a5960a | pbrook | void *host_start;
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199 | 54936004 | bellard | int prot1, prot_new;
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200 | 54936004 | bellard | |
201 | 53a5960a | pbrook | real_end = real_start + qemu_host_page_size; |
202 | 53a5960a | pbrook | host_start = g2h(real_start); |
203 | 54936004 | bellard | |
204 | 54936004 | bellard | /* get the protection of the target pages outside the mapping */
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205 | 54936004 | bellard | prot1 = 0;
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206 | 53a5960a | pbrook | for(addr = real_start; addr < real_end; addr++) {
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207 | 54936004 | bellard | if (addr < start || addr >= end)
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208 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
209 | 54936004 | bellard | } |
210 | 3b46e624 | ths | |
211 | 54936004 | bellard | if (prot1 == 0) { |
212 | 54936004 | bellard | /* no page was there, so we allocate one */
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213 | 80210bcd | ths | void *p = mmap(host_start, qemu_host_page_size, prot,
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214 | 80210bcd | ths | flags | MAP_ANONYMOUS, -1, 0); |
215 | 80210bcd | ths | if (p == MAP_FAILED)
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216 | 80210bcd | ths | return -1; |
217 | 53a5960a | pbrook | prot1 = prot; |
218 | 54936004 | bellard | } |
219 | 54936004 | bellard | prot1 &= PAGE_BITS; |
220 | 54936004 | bellard | |
221 | 54936004 | bellard | prot_new = prot | prot1; |
222 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS)) {
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223 | 54936004 | bellard | /* msync() won't work here, so we return an error if write is
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224 | 54936004 | bellard | possible while it is a shared mapping */
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225 | 54936004 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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226 | 54936004 | bellard | (prot & PROT_WRITE)) |
227 | 54936004 | bellard | return -EINVAL;
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228 | 54936004 | bellard | |
229 | 54936004 | bellard | /* adjust protection to be able to read */
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230 | 54936004 | bellard | if (!(prot1 & PROT_WRITE))
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231 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
232 | 3b46e624 | ths | |
233 | 54936004 | bellard | /* read the corresponding file data */
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234 | 53a5960a | pbrook | pread(fd, g2h(start), end - start, offset); |
235 | 3b46e624 | ths | |
236 | 54936004 | bellard | /* put final protection */
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237 | 54936004 | bellard | if (prot_new != (prot1 | PROT_WRITE))
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238 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
239 | 54936004 | bellard | } else {
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240 | 54936004 | bellard | /* just update the protection */
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241 | 54936004 | bellard | if (prot_new != prot1) {
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242 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
243 | 54936004 | bellard | } |
244 | 54936004 | bellard | } |
245 | 54936004 | bellard | return 0; |
246 | 54936004 | bellard | } |
247 | 54936004 | bellard | |
248 | a03e2d42 | bellard | #if defined(__CYGWIN__)
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249 | a03e2d42 | bellard | /* Cygwin doesn't have a whole lot of address space. */
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250 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x18000000; |
251 | a03e2d42 | bellard | #else
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252 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x40000000; |
253 | a03e2d42 | bellard | #endif
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254 | a03e2d42 | bellard | |
255 | 0776590d | pbrook | unsigned long last_brk; |
256 | 0776590d | pbrook | |
257 | a03e2d42 | bellard | /* find a free memory area of size 'size'. The search starts at
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258 | a03e2d42 | bellard | 'start'. If 'start' == 0, then a default start address is used.
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259 | a03e2d42 | bellard | Return -1 if error.
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260 | a03e2d42 | bellard | */
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261 | 50a9569b | balrog | /* page_init() marks pages used by the host as reserved to be sure not
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262 | a03e2d42 | bellard | to use them. */
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263 | a03e2d42 | bellard | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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264 | a03e2d42 | bellard | { |
265 | a03e2d42 | bellard | abi_ulong addr, addr1, addr_start; |
266 | a03e2d42 | bellard | int prot;
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267 | 0776590d | pbrook | unsigned long new_brk; |
268 | 0776590d | pbrook | |
269 | 0776590d | pbrook | new_brk = (unsigned long)sbrk(0); |
270 | 0776590d | pbrook | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
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271 | 0776590d | pbrook | /* This is a hack to catch the host allocating memory with brk().
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272 | 0776590d | pbrook | If it uses mmap then we loose.
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273 | 0776590d | pbrook | FIXME: We really want to avoid the host allocating memory in
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274 | 0776590d | pbrook | the first place, and maybe leave some slack to avoid switching
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275 | 0776590d | pbrook | to mmap. */
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276 | 0776590d | pbrook | page_set_flags(last_brk & TARGET_PAGE_MASK, |
277 | 0776590d | pbrook | TARGET_PAGE_ALIGN(new_brk), |
278 | 0776590d | pbrook | PAGE_RESERVED); |
279 | 0776590d | pbrook | } |
280 | 0776590d | pbrook | last_brk = new_brk; |
281 | a03e2d42 | bellard | |
282 | a03e2d42 | bellard | size = HOST_PAGE_ALIGN(size); |
283 | a03e2d42 | bellard | start = start & qemu_host_page_mask; |
284 | a03e2d42 | bellard | addr = start; |
285 | a03e2d42 | bellard | if (addr == 0) |
286 | a03e2d42 | bellard | addr = mmap_next_start; |
287 | a03e2d42 | bellard | addr_start = addr; |
288 | a03e2d42 | bellard | for(;;) {
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289 | a03e2d42 | bellard | prot = 0;
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290 | a03e2d42 | bellard | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
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291 | a03e2d42 | bellard | prot |= page_get_flags(addr1); |
292 | a03e2d42 | bellard | } |
293 | a03e2d42 | bellard | if (prot == 0) |
294 | a03e2d42 | bellard | break;
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295 | a03e2d42 | bellard | addr += qemu_host_page_size; |
296 | a03e2d42 | bellard | /* we found nothing */
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297 | a03e2d42 | bellard | if (addr == addr_start)
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298 | a03e2d42 | bellard | return (abi_ulong)-1; |
299 | a03e2d42 | bellard | } |
300 | a03e2d42 | bellard | if (start == 0) |
301 | a03e2d42 | bellard | mmap_next_start = addr + size; |
302 | a03e2d42 | bellard | return addr;
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303 | a03e2d42 | bellard | } |
304 | a03e2d42 | bellard | |
305 | 54936004 | bellard | /* NOTE: all the constants are the HOST ones */
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306 | 992f48a0 | blueswir1 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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307 | 992f48a0 | blueswir1 | int flags, int fd, abi_ulong offset) |
308 | 54936004 | bellard | { |
309 | 992f48a0 | blueswir1 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
310 | a5b85f79 | ths | unsigned long host_start; |
311 | 54936004 | bellard | |
312 | c8a706fe | pbrook | mmap_lock(); |
313 | 54936004 | bellard | #ifdef DEBUG_MMAP
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314 | 54936004 | bellard | { |
315 | a5b85f79 | ths | printf("mmap: start=0x" TARGET_FMT_lx
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316 | 80210bcd | ths | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
317 | 5fafdf24 | ths | start, len, |
318 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
319 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
320 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
321 | 54936004 | bellard | if (flags & MAP_FIXED)
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322 | 54936004 | bellard | printf("MAP_FIXED ");
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323 | 54936004 | bellard | if (flags & MAP_ANONYMOUS)
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324 | 54936004 | bellard | printf("MAP_ANON ");
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325 | 54936004 | bellard | switch(flags & MAP_TYPE) {
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326 | 54936004 | bellard | case MAP_PRIVATE:
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327 | 54936004 | bellard | printf("MAP_PRIVATE ");
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328 | 54936004 | bellard | break;
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329 | 54936004 | bellard | case MAP_SHARED:
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330 | 54936004 | bellard | printf("MAP_SHARED ");
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331 | 54936004 | bellard | break;
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332 | 54936004 | bellard | default:
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333 | 54936004 | bellard | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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334 | 54936004 | bellard | break;
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335 | 54936004 | bellard | } |
336 | a5b85f79 | ths | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
337 | 54936004 | bellard | } |
338 | 54936004 | bellard | #endif
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339 | 54936004 | bellard | |
340 | e89f07d3 | pbrook | if (offset & ~TARGET_PAGE_MASK) {
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341 | e89f07d3 | pbrook | errno = EINVAL; |
342 | c8a706fe | pbrook | goto fail;
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343 | e89f07d3 | pbrook | } |
344 | 54936004 | bellard | |
345 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
346 | 54936004 | bellard | if (len == 0) |
347 | c8a706fe | pbrook | goto the_end;
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348 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
349 | 54936004 | bellard | |
350 | 54936004 | bellard | if (!(flags & MAP_FIXED)) {
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351 | a03e2d42 | bellard | abi_ulong mmap_start; |
352 | a03e2d42 | bellard | void *p;
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353 | a03e2d42 | bellard | host_offset = offset & qemu_host_page_mask; |
354 | a03e2d42 | bellard | host_len = len + offset - host_offset; |
355 | a03e2d42 | bellard | host_len = HOST_PAGE_ALIGN(host_len); |
356 | a03e2d42 | bellard | mmap_start = mmap_find_vma(real_start, host_len); |
357 | a03e2d42 | bellard | if (mmap_start == (abi_ulong)-1) { |
358 | a03e2d42 | bellard | errno = ENOMEM; |
359 | c8a706fe | pbrook | goto fail;
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360 | 54936004 | bellard | } |
361 | a03e2d42 | bellard | /* Note: we prefer to control the mapping address. It is
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362 | a03e2d42 | bellard | especially important if qemu_host_page_size >
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363 | a03e2d42 | bellard | qemu_real_host_page_size */
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364 | a03e2d42 | bellard | p = mmap(g2h(mmap_start), |
365 | a03e2d42 | bellard | host_len, prot, flags | MAP_FIXED, fd, host_offset); |
366 | a03e2d42 | bellard | if (p == MAP_FAILED)
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367 | c8a706fe | pbrook | goto fail;
|
368 | a03e2d42 | bellard | /* update start so that it points to the file position at 'offset' */
|
369 | a03e2d42 | bellard | host_start = (unsigned long)p; |
370 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS))
|
371 | a03e2d42 | bellard | host_start += offset - host_offset; |
372 | a03e2d42 | bellard | start = h2g(host_start); |
373 | a03e2d42 | bellard | } else {
|
374 | 7ab240ad | balrog | int flg;
|
375 | 7ab240ad | balrog | target_ulong addr; |
376 | 7ab240ad | balrog | |
377 | a03e2d42 | bellard | if (start & ~TARGET_PAGE_MASK) {
|
378 | e89f07d3 | pbrook | errno = EINVAL; |
379 | c8a706fe | pbrook | goto fail;
|
380 | e89f07d3 | pbrook | } |
381 | a03e2d42 | bellard | end = start + len; |
382 | a03e2d42 | bellard | real_end = HOST_PAGE_ALIGN(end); |
383 | 7ab240ad | balrog | |
384 | 7ab240ad | balrog | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
385 | 7ab240ad | balrog | flg = page_get_flags(addr); |
386 | 7ab240ad | balrog | if (flg & PAGE_RESERVED) {
|
387 | 7ab240ad | balrog | errno = ENXIO; |
388 | c8a706fe | pbrook | goto fail;
|
389 | 7ab240ad | balrog | } |
390 | 7ab240ad | balrog | } |
391 | 7ab240ad | balrog | |
392 | a03e2d42 | bellard | /* worst case: we cannot map the file because the offset is not
|
393 | a03e2d42 | bellard | aligned, so we read it */
|
394 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS) &&
|
395 | a03e2d42 | bellard | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
396 | a03e2d42 | bellard | /* msync() won't work here, so we return an error if write is
|
397 | a03e2d42 | bellard | possible while it is a shared mapping */
|
398 | a03e2d42 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
|
399 | a03e2d42 | bellard | (prot & PROT_WRITE)) { |
400 | a03e2d42 | bellard | errno = EINVAL; |
401 | c8a706fe | pbrook | goto fail;
|
402 | a03e2d42 | bellard | } |
403 | a03e2d42 | bellard | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
404 | a03e2d42 | bellard | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
405 | a03e2d42 | bellard | -1, 0); |
406 | a03e2d42 | bellard | if (retaddr == -1) |
407 | c8a706fe | pbrook | goto fail;
|
408 | a03e2d42 | bellard | pread(fd, g2h(start), len, offset); |
409 | a03e2d42 | bellard | if (!(prot & PROT_WRITE)) {
|
410 | a03e2d42 | bellard | ret = target_mprotect(start, len, prot); |
411 | c8a706fe | pbrook | if (ret != 0) { |
412 | c8a706fe | pbrook | start = ret; |
413 | c8a706fe | pbrook | goto the_end;
|
414 | c8a706fe | pbrook | } |
415 | a03e2d42 | bellard | } |
416 | a03e2d42 | bellard | goto the_end;
|
417 | 54936004 | bellard | } |
418 | a03e2d42 | bellard | |
419 | a03e2d42 | bellard | /* handle the start of the mapping */
|
420 | a03e2d42 | bellard | if (start > real_start) {
|
421 | a03e2d42 | bellard | if (real_end == real_start + qemu_host_page_size) {
|
422 | a03e2d42 | bellard | /* one single host page */
|
423 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, end, |
424 | a03e2d42 | bellard | prot, flags, fd, offset); |
425 | a03e2d42 | bellard | if (ret == -1) |
426 | c8a706fe | pbrook | goto fail;
|
427 | a03e2d42 | bellard | goto the_end1;
|
428 | a03e2d42 | bellard | } |
429 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, |
430 | 54936004 | bellard | prot, flags, fd, offset); |
431 | 54936004 | bellard | if (ret == -1) |
432 | c8a706fe | pbrook | goto fail;
|
433 | a03e2d42 | bellard | real_start += qemu_host_page_size; |
434 | a03e2d42 | bellard | } |
435 | a03e2d42 | bellard | /* handle the end of the mapping */
|
436 | a03e2d42 | bellard | if (end < real_end) {
|
437 | a03e2d42 | bellard | ret = mmap_frag(real_end - qemu_host_page_size, |
438 | a03e2d42 | bellard | real_end - qemu_host_page_size, real_end, |
439 | a03e2d42 | bellard | prot, flags, fd, |
440 | a03e2d42 | bellard | offset + real_end - qemu_host_page_size - start); |
441 | a03e2d42 | bellard | if (ret == -1) |
442 | c8a706fe | pbrook | goto fail;
|
443 | a03e2d42 | bellard | real_end -= qemu_host_page_size; |
444 | 54936004 | bellard | } |
445 | 3b46e624 | ths | |
446 | a03e2d42 | bellard | /* map the middle (easier) */
|
447 | a03e2d42 | bellard | if (real_start < real_end) {
|
448 | a03e2d42 | bellard | void *p;
|
449 | a03e2d42 | bellard | unsigned long offset1; |
450 | a03e2d42 | bellard | if (flags & MAP_ANONYMOUS)
|
451 | a03e2d42 | bellard | offset1 = 0;
|
452 | a03e2d42 | bellard | else
|
453 | a03e2d42 | bellard | offset1 = offset + real_start - start; |
454 | a03e2d42 | bellard | p = mmap(g2h(real_start), real_end - real_start, |
455 | a03e2d42 | bellard | prot, flags, fd, offset1); |
456 | a03e2d42 | bellard | if (p == MAP_FAILED)
|
457 | c8a706fe | pbrook | goto fail;
|
458 | a03e2d42 | bellard | } |
459 | 54936004 | bellard | } |
460 | 54936004 | bellard | the_end1:
|
461 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
462 | 54936004 | bellard | the_end:
|
463 | 54936004 | bellard | #ifdef DEBUG_MMAP
|
464 | 2e0ded9c | edgar_igl | printf("ret=0x" TARGET_FMT_lx "\n", start); |
465 | 54936004 | bellard | page_dump(stdout); |
466 | 54936004 | bellard | printf("\n");
|
467 | 54936004 | bellard | #endif
|
468 | c8a706fe | pbrook | mmap_unlock(); |
469 | 54936004 | bellard | return start;
|
470 | c8a706fe | pbrook | fail:
|
471 | c8a706fe | pbrook | mmap_unlock(); |
472 | c8a706fe | pbrook | return -1; |
473 | 54936004 | bellard | } |
474 | 54936004 | bellard | |
475 | 992f48a0 | blueswir1 | int target_munmap(abi_ulong start, abi_ulong len)
|
476 | 54936004 | bellard | { |
477 | 992f48a0 | blueswir1 | abi_ulong end, real_start, real_end, addr; |
478 | 54936004 | bellard | int prot, ret;
|
479 | 54936004 | bellard | |
480 | 54936004 | bellard | #ifdef DEBUG_MMAP
|
481 | 54936004 | bellard | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
|
482 | 54936004 | bellard | #endif
|
483 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
|
484 | 54936004 | bellard | return -EINVAL;
|
485 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
486 | 54936004 | bellard | if (len == 0) |
487 | 54936004 | bellard | return -EINVAL;
|
488 | c8a706fe | pbrook | mmap_lock(); |
489 | 54936004 | bellard | end = start + len; |
490 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
491 | 53a5960a | pbrook | real_end = HOST_PAGE_ALIGN(end); |
492 | 54936004 | bellard | |
493 | 53a5960a | pbrook | if (start > real_start) {
|
494 | 54936004 | bellard | /* handle host page containing start */
|
495 | 54936004 | bellard | prot = 0;
|
496 | 53a5960a | pbrook | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
497 | 54936004 | bellard | prot |= page_get_flags(addr); |
498 | 54936004 | bellard | } |
499 | 53a5960a | pbrook | if (real_end == real_start + qemu_host_page_size) {
|
500 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
501 | d418c81e | bellard | prot |= page_get_flags(addr); |
502 | d418c81e | bellard | } |
503 | 53a5960a | pbrook | end = real_end; |
504 | d418c81e | bellard | } |
505 | 54936004 | bellard | if (prot != 0) |
506 | 53a5960a | pbrook | real_start += qemu_host_page_size; |
507 | 54936004 | bellard | } |
508 | 53a5960a | pbrook | if (end < real_end) {
|
509 | 54936004 | bellard | prot = 0;
|
510 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
511 | 54936004 | bellard | prot |= page_get_flags(addr); |
512 | 54936004 | bellard | } |
513 | 54936004 | bellard | if (prot != 0) |
514 | 53a5960a | pbrook | real_end -= qemu_host_page_size; |
515 | 54936004 | bellard | } |
516 | 3b46e624 | ths | |
517 | c8a706fe | pbrook | ret = 0;
|
518 | 54936004 | bellard | /* unmap what we can */
|
519 | 53a5960a | pbrook | if (real_start < real_end) {
|
520 | 4118a970 | j_mayer | ret = munmap(g2h(real_start), real_end - real_start); |
521 | 54936004 | bellard | } |
522 | 54936004 | bellard | |
523 | c8a706fe | pbrook | if (ret == 0) |
524 | c8a706fe | pbrook | page_set_flags(start, start + len, 0);
|
525 | c8a706fe | pbrook | mmap_unlock(); |
526 | c8a706fe | pbrook | return ret;
|
527 | 54936004 | bellard | } |
528 | 54936004 | bellard | |
529 | 54936004 | bellard | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
|
530 | 54936004 | bellard | blocks which have been allocated starting on a host page */
|
531 | 992f48a0 | blueswir1 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
532 | 992f48a0 | blueswir1 | abi_ulong new_size, unsigned long flags, |
533 | 992f48a0 | blueswir1 | abi_ulong new_addr) |
534 | 54936004 | bellard | { |
535 | 54936004 | bellard | int prot;
|
536 | a5b85f79 | ths | unsigned long host_addr; |
537 | 54936004 | bellard | |
538 | c8a706fe | pbrook | mmap_lock(); |
539 | 54936004 | bellard | /* XXX: use 5 args syscall */
|
540 | a5b85f79 | ths | host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
|
541 | c8a706fe | pbrook | if (host_addr == -1) { |
542 | c8a706fe | pbrook | new_addr = -1;
|
543 | c8a706fe | pbrook | } else {
|
544 | c8a706fe | pbrook | new_addr = h2g(host_addr); |
545 | c8a706fe | pbrook | prot = page_get_flags(old_addr); |
546 | c8a706fe | pbrook | page_set_flags(old_addr, old_addr + old_size, 0);
|
547 | c8a706fe | pbrook | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
548 | c8a706fe | pbrook | } |
549 | c8a706fe | pbrook | mmap_unlock(); |
550 | 54936004 | bellard | return new_addr;
|
551 | 54936004 | bellard | } |
552 | 54936004 | bellard | |
553 | 992f48a0 | blueswir1 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
554 | 54936004 | bellard | { |
555 | 992f48a0 | blueswir1 | abi_ulong end; |
556 | 54936004 | bellard | |
557 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
|
558 | 54936004 | bellard | return -EINVAL;
|
559 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
560 | 54936004 | bellard | end = start + len; |
561 | d418c81e | bellard | if (end < start)
|
562 | d418c81e | bellard | return -EINVAL;
|
563 | d418c81e | bellard | if (end == start)
|
564 | d418c81e | bellard | return 0; |
565 | 3b46e624 | ths | |
566 | 83fb7adf | bellard | start &= qemu_host_page_mask; |
567 | 53a5960a | pbrook | return msync(g2h(start), end - start, flags);
|
568 | 54936004 | bellard | } |