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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 | 530e7615 | blueswir1 | * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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19 | 530e7615 | blueswir1 | * MA 02110-1301, USA.
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20 | 54936004 | bellard | */
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21 | 54936004 | bellard | #include <stdlib.h> |
22 | 54936004 | bellard | #include <stdio.h> |
23 | 54936004 | bellard | #include <stdarg.h> |
24 | 54936004 | bellard | #include <string.h> |
25 | 54936004 | bellard | #include <unistd.h> |
26 | 54936004 | bellard | #include <errno.h> |
27 | 54936004 | bellard | #include <sys/mman.h> |
28 | 3af72a4d | blueswir1 | #include <linux/mman.h> |
29 | 3af72a4d | blueswir1 | #include <linux/unistd.h> |
30 | 54936004 | bellard | |
31 | 54936004 | bellard | #include "qemu.h" |
32 | 78f5bf1e | blueswir1 | #include "qemu-common.h" |
33 | 54936004 | bellard | |
34 | 54936004 | bellard | //#define DEBUG_MMAP
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35 | 54936004 | bellard | |
36 | c8a706fe | pbrook | #if defined(USE_NPTL)
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37 | c8a706fe | pbrook | pthread_mutex_t mmap_mutex; |
38 | c8a706fe | pbrook | static int __thread mmap_lock_count; |
39 | c8a706fe | pbrook | |
40 | c8a706fe | pbrook | void mmap_lock(void) |
41 | c8a706fe | pbrook | { |
42 | c8a706fe | pbrook | if (mmap_lock_count++ == 0) { |
43 | c8a706fe | pbrook | pthread_mutex_lock(&mmap_mutex); |
44 | c8a706fe | pbrook | } |
45 | c8a706fe | pbrook | } |
46 | c8a706fe | pbrook | |
47 | c8a706fe | pbrook | void mmap_unlock(void) |
48 | c8a706fe | pbrook | { |
49 | c8a706fe | pbrook | if (--mmap_lock_count == 0) { |
50 | c8a706fe | pbrook | pthread_mutex_unlock(&mmap_mutex); |
51 | c8a706fe | pbrook | } |
52 | c8a706fe | pbrook | } |
53 | d5975363 | pbrook | |
54 | d5975363 | pbrook | /* Grab lock to make sure things are in a consistent state after fork(). */
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55 | d5975363 | pbrook | void mmap_fork_start(void) |
56 | d5975363 | pbrook | { |
57 | d5975363 | pbrook | if (mmap_lock_count)
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58 | d5975363 | pbrook | abort(); |
59 | d5975363 | pbrook | pthread_mutex_lock(&mmap_mutex); |
60 | d5975363 | pbrook | } |
61 | d5975363 | pbrook | |
62 | d5975363 | pbrook | void mmap_fork_end(int child) |
63 | d5975363 | pbrook | { |
64 | d5975363 | pbrook | if (child)
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65 | d5975363 | pbrook | pthread_mutex_init(&mmap_mutex, NULL);
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66 | d5975363 | pbrook | else
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67 | d5975363 | pbrook | pthread_mutex_unlock(&mmap_mutex); |
68 | d5975363 | pbrook | } |
69 | c8a706fe | pbrook | #else
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70 | c8a706fe | pbrook | /* We aren't threadsafe to start with, so no need to worry about locking. */
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71 | c8a706fe | pbrook | void mmap_lock(void) |
72 | c8a706fe | pbrook | { |
73 | c8a706fe | pbrook | } |
74 | c8a706fe | pbrook | |
75 | c8a706fe | pbrook | void mmap_unlock(void) |
76 | c8a706fe | pbrook | { |
77 | c8a706fe | pbrook | } |
78 | c8a706fe | pbrook | #endif
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79 | c8a706fe | pbrook | |
80 | 17e2377a | pbrook | void *qemu_vmalloc(size_t size)
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81 | 17e2377a | pbrook | { |
82 | 17e2377a | pbrook | void *p;
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83 | 17e2377a | pbrook | unsigned long addr; |
84 | 17e2377a | pbrook | mmap_lock(); |
85 | 17e2377a | pbrook | /* Use map and mark the pages as used. */
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86 | 17e2377a | pbrook | p = mmap(NULL, size, PROT_READ | PROT_WRITE,
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87 | 17e2377a | pbrook | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
88 | 17e2377a | pbrook | |
89 | 17e2377a | pbrook | addr = (unsigned long)p; |
90 | 17e2377a | pbrook | if (addr == (target_ulong) addr) {
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91 | 17e2377a | pbrook | /* Allocated region overlaps guest address space.
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92 | 17e2377a | pbrook | This may recurse. */
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93 | 17e2377a | pbrook | page_set_flags(addr & TARGET_PAGE_MASK, TARGET_PAGE_ALIGN(addr + size), |
94 | 17e2377a | pbrook | PAGE_RESERVED); |
95 | 17e2377a | pbrook | } |
96 | 17e2377a | pbrook | |
97 | 17e2377a | pbrook | mmap_unlock(); |
98 | 17e2377a | pbrook | return p;
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99 | 17e2377a | pbrook | } |
100 | 17e2377a | pbrook | |
101 | 17e2377a | pbrook | void *qemu_malloc(size_t size)
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102 | 17e2377a | pbrook | { |
103 | 17e2377a | pbrook | char * p;
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104 | 17e2377a | pbrook | size += 16;
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105 | 17e2377a | pbrook | p = qemu_vmalloc(size); |
106 | 17e2377a | pbrook | *(size_t *)p = size; |
107 | 17e2377a | pbrook | return p + 16; |
108 | 17e2377a | pbrook | } |
109 | 17e2377a | pbrook | |
110 | 17e2377a | pbrook | /* We use map, which is always zero initialized. */
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111 | 17e2377a | pbrook | void * qemu_mallocz(size_t size)
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112 | 17e2377a | pbrook | { |
113 | 17e2377a | pbrook | return qemu_malloc(size);
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114 | 17e2377a | pbrook | } |
115 | 17e2377a | pbrook | |
116 | 17e2377a | pbrook | void qemu_free(void *ptr) |
117 | 17e2377a | pbrook | { |
118 | 17e2377a | pbrook | /* FIXME: We should unmark the reserved pages here. However this gets
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119 | 17e2377a | pbrook | complicated when one target page spans multiple host pages, so we
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120 | 17e2377a | pbrook | don't bother. */
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121 | 17e2377a | pbrook | size_t *p; |
122 | 17e2377a | pbrook | p = (size_t *)((char *)ptr - 16); |
123 | 17e2377a | pbrook | munmap(p, *p); |
124 | 17e2377a | pbrook | } |
125 | 17e2377a | pbrook | |
126 | 53a5960a | pbrook | /* NOTE: all the constants are the HOST ones, but addresses are target. */
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127 | 992f48a0 | blueswir1 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
128 | 54936004 | bellard | { |
129 | 992f48a0 | blueswir1 | abi_ulong end, host_start, host_end, addr; |
130 | 54936004 | bellard | int prot1, ret;
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131 | 54936004 | bellard | |
132 | 54936004 | bellard | #ifdef DEBUG_MMAP
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133 | a5b85f79 | ths | printf("mprotect: start=0x" TARGET_FMT_lx
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134 | 80210bcd | ths | "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
135 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
136 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
137 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
138 | 54936004 | bellard | #endif
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139 | 54936004 | bellard | |
140 | 54936004 | bellard | if ((start & ~TARGET_PAGE_MASK) != 0) |
141 | 54936004 | bellard | return -EINVAL;
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142 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
143 | 54936004 | bellard | end = start + len; |
144 | 54936004 | bellard | if (end < start)
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145 | 54936004 | bellard | return -EINVAL;
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146 | 171cd1cd | balrog | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
147 | 54936004 | bellard | if (len == 0) |
148 | 54936004 | bellard | return 0; |
149 | 3b46e624 | ths | |
150 | c8a706fe | pbrook | mmap_lock(); |
151 | 83fb7adf | bellard | host_start = start & qemu_host_page_mask; |
152 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
153 | 54936004 | bellard | if (start > host_start) {
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154 | 54936004 | bellard | /* handle host page containing start */
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155 | 54936004 | bellard | prot1 = prot; |
156 | 54936004 | bellard | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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157 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
158 | 54936004 | bellard | } |
159 | 83fb7adf | bellard | if (host_end == host_start + qemu_host_page_size) {
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160 | d418c81e | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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161 | d418c81e | bellard | prot1 |= page_get_flags(addr); |
162 | d418c81e | bellard | } |
163 | d418c81e | bellard | end = host_end; |
164 | d418c81e | bellard | } |
165 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
166 | 54936004 | bellard | if (ret != 0) |
167 | c8a706fe | pbrook | goto error;
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168 | 83fb7adf | bellard | host_start += qemu_host_page_size; |
169 | 54936004 | bellard | } |
170 | 54936004 | bellard | if (end < host_end) {
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171 | 54936004 | bellard | prot1 = prot; |
172 | 54936004 | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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173 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
174 | 54936004 | bellard | } |
175 | 5fafdf24 | ths | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
176 | 54936004 | bellard | prot1 & PAGE_BITS); |
177 | 54936004 | bellard | if (ret != 0) |
178 | c8a706fe | pbrook | goto error;
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179 | 83fb7adf | bellard | host_end -= qemu_host_page_size; |
180 | 54936004 | bellard | } |
181 | 3b46e624 | ths | |
182 | 54936004 | bellard | /* handle the pages in the middle */
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183 | 54936004 | bellard | if (host_start < host_end) {
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184 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
185 | 54936004 | bellard | if (ret != 0) |
186 | c8a706fe | pbrook | goto error;
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187 | 54936004 | bellard | } |
188 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
189 | c8a706fe | pbrook | mmap_unlock(); |
190 | 54936004 | bellard | return 0; |
191 | c8a706fe | pbrook | error:
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192 | c8a706fe | pbrook | mmap_unlock(); |
193 | c8a706fe | pbrook | return ret;
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194 | 54936004 | bellard | } |
195 | 54936004 | bellard | |
196 | 54936004 | bellard | /* map an incomplete host page */
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197 | 992f48a0 | blueswir1 | static int mmap_frag(abi_ulong real_start, |
198 | 992f48a0 | blueswir1 | abi_ulong start, abi_ulong end, |
199 | 992f48a0 | blueswir1 | int prot, int flags, int fd, abi_ulong offset) |
200 | 54936004 | bellard | { |
201 | 80210bcd | ths | abi_ulong real_end, addr; |
202 | 53a5960a | pbrook | void *host_start;
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203 | 54936004 | bellard | int prot1, prot_new;
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204 | 54936004 | bellard | |
205 | 53a5960a | pbrook | real_end = real_start + qemu_host_page_size; |
206 | 53a5960a | pbrook | host_start = g2h(real_start); |
207 | 54936004 | bellard | |
208 | 54936004 | bellard | /* get the protection of the target pages outside the mapping */
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209 | 54936004 | bellard | prot1 = 0;
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210 | 53a5960a | pbrook | for(addr = real_start; addr < real_end; addr++) {
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211 | 54936004 | bellard | if (addr < start || addr >= end)
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212 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
213 | 54936004 | bellard | } |
214 | 3b46e624 | ths | |
215 | 54936004 | bellard | if (prot1 == 0) { |
216 | 54936004 | bellard | /* no page was there, so we allocate one */
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217 | 80210bcd | ths | void *p = mmap(host_start, qemu_host_page_size, prot,
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218 | 80210bcd | ths | flags | MAP_ANONYMOUS, -1, 0); |
219 | 80210bcd | ths | if (p == MAP_FAILED)
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220 | 80210bcd | ths | return -1; |
221 | 53a5960a | pbrook | prot1 = prot; |
222 | 54936004 | bellard | } |
223 | 54936004 | bellard | prot1 &= PAGE_BITS; |
224 | 54936004 | bellard | |
225 | 54936004 | bellard | prot_new = prot | prot1; |
226 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS)) {
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227 | 54936004 | bellard | /* msync() won't work here, so we return an error if write is
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228 | 54936004 | bellard | possible while it is a shared mapping */
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229 | 54936004 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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230 | 54936004 | bellard | (prot & PROT_WRITE)) |
231 | 54936004 | bellard | return -EINVAL;
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232 | 54936004 | bellard | |
233 | 54936004 | bellard | /* adjust protection to be able to read */
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234 | 54936004 | bellard | if (!(prot1 & PROT_WRITE))
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235 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
236 | 3b46e624 | ths | |
237 | 54936004 | bellard | /* read the corresponding file data */
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238 | 53a5960a | pbrook | pread(fd, g2h(start), end - start, offset); |
239 | 3b46e624 | ths | |
240 | 54936004 | bellard | /* put final protection */
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241 | 54936004 | bellard | if (prot_new != (prot1 | PROT_WRITE))
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242 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
243 | 54936004 | bellard | } else {
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244 | 54936004 | bellard | /* just update the protection */
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245 | 54936004 | bellard | if (prot_new != prot1) {
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246 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
247 | 54936004 | bellard | } |
248 | 54936004 | bellard | } |
249 | 54936004 | bellard | return 0; |
250 | 54936004 | bellard | } |
251 | 54936004 | bellard | |
252 | a03e2d42 | bellard | #if defined(__CYGWIN__)
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253 | a03e2d42 | bellard | /* Cygwin doesn't have a whole lot of address space. */
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254 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x18000000; |
255 | a03e2d42 | bellard | #else
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256 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x40000000; |
257 | a03e2d42 | bellard | #endif
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258 | a03e2d42 | bellard | |
259 | 0776590d | pbrook | unsigned long last_brk; |
260 | 0776590d | pbrook | |
261 | a03e2d42 | bellard | /* find a free memory area of size 'size'. The search starts at
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262 | a03e2d42 | bellard | 'start'. If 'start' == 0, then a default start address is used.
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263 | a03e2d42 | bellard | Return -1 if error.
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264 | a03e2d42 | bellard | */
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265 | 50a9569b | balrog | /* page_init() marks pages used by the host as reserved to be sure not
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266 | a03e2d42 | bellard | to use them. */
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267 | a03e2d42 | bellard | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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268 | a03e2d42 | bellard | { |
269 | a03e2d42 | bellard | abi_ulong addr, addr1, addr_start; |
270 | a03e2d42 | bellard | int prot;
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271 | 0776590d | pbrook | unsigned long new_brk; |
272 | 0776590d | pbrook | |
273 | 0776590d | pbrook | new_brk = (unsigned long)sbrk(0); |
274 | 0776590d | pbrook | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
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275 | 0776590d | pbrook | /* This is a hack to catch the host allocating memory with brk().
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276 | 0776590d | pbrook | If it uses mmap then we loose.
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277 | 0776590d | pbrook | FIXME: We really want to avoid the host allocating memory in
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278 | 0776590d | pbrook | the first place, and maybe leave some slack to avoid switching
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279 | 0776590d | pbrook | to mmap. */
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280 | 0776590d | pbrook | page_set_flags(last_brk & TARGET_PAGE_MASK, |
281 | 0776590d | pbrook | TARGET_PAGE_ALIGN(new_brk), |
282 | 0776590d | pbrook | PAGE_RESERVED); |
283 | 0776590d | pbrook | } |
284 | 0776590d | pbrook | last_brk = new_brk; |
285 | a03e2d42 | bellard | |
286 | a03e2d42 | bellard | size = HOST_PAGE_ALIGN(size); |
287 | a03e2d42 | bellard | start = start & qemu_host_page_mask; |
288 | a03e2d42 | bellard | addr = start; |
289 | a03e2d42 | bellard | if (addr == 0) |
290 | a03e2d42 | bellard | addr = mmap_next_start; |
291 | a03e2d42 | bellard | addr_start = addr; |
292 | a03e2d42 | bellard | for(;;) {
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293 | a03e2d42 | bellard | prot = 0;
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294 | a03e2d42 | bellard | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
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295 | a03e2d42 | bellard | prot |= page_get_flags(addr1); |
296 | a03e2d42 | bellard | } |
297 | a03e2d42 | bellard | if (prot == 0) |
298 | a03e2d42 | bellard | break;
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299 | a03e2d42 | bellard | addr += qemu_host_page_size; |
300 | a03e2d42 | bellard | /* we found nothing */
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301 | a03e2d42 | bellard | if (addr == addr_start)
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302 | a03e2d42 | bellard | return (abi_ulong)-1; |
303 | a03e2d42 | bellard | } |
304 | a03e2d42 | bellard | if (start == 0) |
305 | a03e2d42 | bellard | mmap_next_start = addr + size; |
306 | a03e2d42 | bellard | return addr;
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307 | a03e2d42 | bellard | } |
308 | a03e2d42 | bellard | |
309 | 54936004 | bellard | /* NOTE: all the constants are the HOST ones */
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310 | 992f48a0 | blueswir1 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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311 | 992f48a0 | blueswir1 | int flags, int fd, abi_ulong offset) |
312 | 54936004 | bellard | { |
313 | 992f48a0 | blueswir1 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
314 | a5b85f79 | ths | unsigned long host_start; |
315 | 54936004 | bellard | |
316 | c8a706fe | pbrook | mmap_lock(); |
317 | 54936004 | bellard | #ifdef DEBUG_MMAP
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318 | 54936004 | bellard | { |
319 | a5b85f79 | ths | printf("mmap: start=0x" TARGET_FMT_lx
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320 | 80210bcd | ths | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
321 | 5fafdf24 | ths | start, len, |
322 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
323 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
324 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
325 | 54936004 | bellard | if (flags & MAP_FIXED)
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326 | 54936004 | bellard | printf("MAP_FIXED ");
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327 | 54936004 | bellard | if (flags & MAP_ANONYMOUS)
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328 | 54936004 | bellard | printf("MAP_ANON ");
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329 | 54936004 | bellard | switch(flags & MAP_TYPE) {
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330 | 54936004 | bellard | case MAP_PRIVATE:
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331 | 54936004 | bellard | printf("MAP_PRIVATE ");
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332 | 54936004 | bellard | break;
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333 | 54936004 | bellard | case MAP_SHARED:
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334 | 54936004 | bellard | printf("MAP_SHARED ");
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335 | 54936004 | bellard | break;
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336 | 54936004 | bellard | default:
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337 | 54936004 | bellard | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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338 | 54936004 | bellard | break;
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339 | 54936004 | bellard | } |
340 | a5b85f79 | ths | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
341 | 54936004 | bellard | } |
342 | 54936004 | bellard | #endif
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343 | 54936004 | bellard | |
344 | e89f07d3 | pbrook | if (offset & ~TARGET_PAGE_MASK) {
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345 | e89f07d3 | pbrook | errno = EINVAL; |
346 | c8a706fe | pbrook | goto fail;
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347 | e89f07d3 | pbrook | } |
348 | 54936004 | bellard | |
349 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
350 | 54936004 | bellard | if (len == 0) |
351 | c8a706fe | pbrook | goto the_end;
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352 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
353 | 54936004 | bellard | |
354 | 54936004 | bellard | if (!(flags & MAP_FIXED)) {
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355 | a03e2d42 | bellard | abi_ulong mmap_start; |
356 | a03e2d42 | bellard | void *p;
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357 | a03e2d42 | bellard | host_offset = offset & qemu_host_page_mask; |
358 | a03e2d42 | bellard | host_len = len + offset - host_offset; |
359 | a03e2d42 | bellard | host_len = HOST_PAGE_ALIGN(host_len); |
360 | a03e2d42 | bellard | mmap_start = mmap_find_vma(real_start, host_len); |
361 | a03e2d42 | bellard | if (mmap_start == (abi_ulong)-1) { |
362 | a03e2d42 | bellard | errno = ENOMEM; |
363 | c8a706fe | pbrook | goto fail;
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364 | 54936004 | bellard | } |
365 | a03e2d42 | bellard | /* Note: we prefer to control the mapping address. It is
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366 | a03e2d42 | bellard | especially important if qemu_host_page_size >
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367 | a03e2d42 | bellard | qemu_real_host_page_size */
|
368 | a03e2d42 | bellard | p = mmap(g2h(mmap_start), |
369 | a03e2d42 | bellard | host_len, prot, flags | MAP_FIXED, fd, host_offset); |
370 | a03e2d42 | bellard | if (p == MAP_FAILED)
|
371 | c8a706fe | pbrook | goto fail;
|
372 | a03e2d42 | bellard | /* update start so that it points to the file position at 'offset' */
|
373 | a03e2d42 | bellard | host_start = (unsigned long)p; |
374 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS))
|
375 | a03e2d42 | bellard | host_start += offset - host_offset; |
376 | a03e2d42 | bellard | start = h2g(host_start); |
377 | a03e2d42 | bellard | } else {
|
378 | 7ab240ad | balrog | int flg;
|
379 | 7ab240ad | balrog | target_ulong addr; |
380 | 7ab240ad | balrog | |
381 | a03e2d42 | bellard | if (start & ~TARGET_PAGE_MASK) {
|
382 | e89f07d3 | pbrook | errno = EINVAL; |
383 | c8a706fe | pbrook | goto fail;
|
384 | e89f07d3 | pbrook | } |
385 | a03e2d42 | bellard | end = start + len; |
386 | a03e2d42 | bellard | real_end = HOST_PAGE_ALIGN(end); |
387 | 7ab240ad | balrog | |
388 | 45bc1f52 | aurel32 | /*
|
389 | 45bc1f52 | aurel32 | * Test if requested memory area fits target address space
|
390 | 45bc1f52 | aurel32 | * It can fail only on 64-bit host with 32-bit target.
|
391 | 45bc1f52 | aurel32 | * On any other target/host host mmap() handles this error correctly.
|
392 | 45bc1f52 | aurel32 | */
|
393 | 45bc1f52 | aurel32 | if ((unsigned long)start + len - 1 > (abi_ulong) -1) { |
394 | 45bc1f52 | aurel32 | errno = EINVAL; |
395 | 45bc1f52 | aurel32 | goto fail;
|
396 | 45bc1f52 | aurel32 | } |
397 | 45bc1f52 | aurel32 | |
398 | 7ab240ad | balrog | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
399 | 7ab240ad | balrog | flg = page_get_flags(addr); |
400 | 7ab240ad | balrog | if (flg & PAGE_RESERVED) {
|
401 | 7ab240ad | balrog | errno = ENXIO; |
402 | c8a706fe | pbrook | goto fail;
|
403 | 7ab240ad | balrog | } |
404 | 7ab240ad | balrog | } |
405 | 7ab240ad | balrog | |
406 | a03e2d42 | bellard | /* worst case: we cannot map the file because the offset is not
|
407 | a03e2d42 | bellard | aligned, so we read it */
|
408 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS) &&
|
409 | a03e2d42 | bellard | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
410 | a03e2d42 | bellard | /* msync() won't work here, so we return an error if write is
|
411 | a03e2d42 | bellard | possible while it is a shared mapping */
|
412 | a03e2d42 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
|
413 | a03e2d42 | bellard | (prot & PROT_WRITE)) { |
414 | a03e2d42 | bellard | errno = EINVAL; |
415 | c8a706fe | pbrook | goto fail;
|
416 | a03e2d42 | bellard | } |
417 | a03e2d42 | bellard | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
418 | a03e2d42 | bellard | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
419 | a03e2d42 | bellard | -1, 0); |
420 | a03e2d42 | bellard | if (retaddr == -1) |
421 | c8a706fe | pbrook | goto fail;
|
422 | a03e2d42 | bellard | pread(fd, g2h(start), len, offset); |
423 | a03e2d42 | bellard | if (!(prot & PROT_WRITE)) {
|
424 | a03e2d42 | bellard | ret = target_mprotect(start, len, prot); |
425 | c8a706fe | pbrook | if (ret != 0) { |
426 | c8a706fe | pbrook | start = ret; |
427 | c8a706fe | pbrook | goto the_end;
|
428 | c8a706fe | pbrook | } |
429 | a03e2d42 | bellard | } |
430 | a03e2d42 | bellard | goto the_end;
|
431 | 54936004 | bellard | } |
432 | a03e2d42 | bellard | |
433 | a03e2d42 | bellard | /* handle the start of the mapping */
|
434 | a03e2d42 | bellard | if (start > real_start) {
|
435 | a03e2d42 | bellard | if (real_end == real_start + qemu_host_page_size) {
|
436 | a03e2d42 | bellard | /* one single host page */
|
437 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, end, |
438 | a03e2d42 | bellard | prot, flags, fd, offset); |
439 | a03e2d42 | bellard | if (ret == -1) |
440 | c8a706fe | pbrook | goto fail;
|
441 | a03e2d42 | bellard | goto the_end1;
|
442 | a03e2d42 | bellard | } |
443 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, |
444 | 54936004 | bellard | prot, flags, fd, offset); |
445 | 54936004 | bellard | if (ret == -1) |
446 | c8a706fe | pbrook | goto fail;
|
447 | a03e2d42 | bellard | real_start += qemu_host_page_size; |
448 | a03e2d42 | bellard | } |
449 | a03e2d42 | bellard | /* handle the end of the mapping */
|
450 | a03e2d42 | bellard | if (end < real_end) {
|
451 | a03e2d42 | bellard | ret = mmap_frag(real_end - qemu_host_page_size, |
452 | a03e2d42 | bellard | real_end - qemu_host_page_size, real_end, |
453 | a03e2d42 | bellard | prot, flags, fd, |
454 | a03e2d42 | bellard | offset + real_end - qemu_host_page_size - start); |
455 | a03e2d42 | bellard | if (ret == -1) |
456 | c8a706fe | pbrook | goto fail;
|
457 | a03e2d42 | bellard | real_end -= qemu_host_page_size; |
458 | 54936004 | bellard | } |
459 | 3b46e624 | ths | |
460 | a03e2d42 | bellard | /* map the middle (easier) */
|
461 | a03e2d42 | bellard | if (real_start < real_end) {
|
462 | a03e2d42 | bellard | void *p;
|
463 | a03e2d42 | bellard | unsigned long offset1; |
464 | a03e2d42 | bellard | if (flags & MAP_ANONYMOUS)
|
465 | a03e2d42 | bellard | offset1 = 0;
|
466 | a03e2d42 | bellard | else
|
467 | a03e2d42 | bellard | offset1 = offset + real_start - start; |
468 | a03e2d42 | bellard | p = mmap(g2h(real_start), real_end - real_start, |
469 | a03e2d42 | bellard | prot, flags, fd, offset1); |
470 | a03e2d42 | bellard | if (p == MAP_FAILED)
|
471 | c8a706fe | pbrook | goto fail;
|
472 | a03e2d42 | bellard | } |
473 | 54936004 | bellard | } |
474 | 54936004 | bellard | the_end1:
|
475 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
476 | 54936004 | bellard | the_end:
|
477 | 54936004 | bellard | #ifdef DEBUG_MMAP
|
478 | 2e0ded9c | edgar_igl | printf("ret=0x" TARGET_FMT_lx "\n", start); |
479 | 54936004 | bellard | page_dump(stdout); |
480 | 54936004 | bellard | printf("\n");
|
481 | 54936004 | bellard | #endif
|
482 | c8a706fe | pbrook | mmap_unlock(); |
483 | 54936004 | bellard | return start;
|
484 | c8a706fe | pbrook | fail:
|
485 | c8a706fe | pbrook | mmap_unlock(); |
486 | c8a706fe | pbrook | return -1; |
487 | 54936004 | bellard | } |
488 | 54936004 | bellard | |
489 | 992f48a0 | blueswir1 | int target_munmap(abi_ulong start, abi_ulong len)
|
490 | 54936004 | bellard | { |
491 | 992f48a0 | blueswir1 | abi_ulong end, real_start, real_end, addr; |
492 | 54936004 | bellard | int prot, ret;
|
493 | 54936004 | bellard | |
494 | 54936004 | bellard | #ifdef DEBUG_MMAP
|
495 | 54936004 | bellard | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
|
496 | 54936004 | bellard | #endif
|
497 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
|
498 | 54936004 | bellard | return -EINVAL;
|
499 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
500 | 54936004 | bellard | if (len == 0) |
501 | 54936004 | bellard | return -EINVAL;
|
502 | c8a706fe | pbrook | mmap_lock(); |
503 | 54936004 | bellard | end = start + len; |
504 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
505 | 53a5960a | pbrook | real_end = HOST_PAGE_ALIGN(end); |
506 | 54936004 | bellard | |
507 | 53a5960a | pbrook | if (start > real_start) {
|
508 | 54936004 | bellard | /* handle host page containing start */
|
509 | 54936004 | bellard | prot = 0;
|
510 | 53a5960a | pbrook | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
511 | 54936004 | bellard | prot |= page_get_flags(addr); |
512 | 54936004 | bellard | } |
513 | 53a5960a | pbrook | if (real_end == real_start + qemu_host_page_size) {
|
514 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
515 | d418c81e | bellard | prot |= page_get_flags(addr); |
516 | d418c81e | bellard | } |
517 | 53a5960a | pbrook | end = real_end; |
518 | d418c81e | bellard | } |
519 | 54936004 | bellard | if (prot != 0) |
520 | 53a5960a | pbrook | real_start += qemu_host_page_size; |
521 | 54936004 | bellard | } |
522 | 53a5960a | pbrook | if (end < real_end) {
|
523 | 54936004 | bellard | prot = 0;
|
524 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
525 | 54936004 | bellard | prot |= page_get_flags(addr); |
526 | 54936004 | bellard | } |
527 | 54936004 | bellard | if (prot != 0) |
528 | 53a5960a | pbrook | real_end -= qemu_host_page_size; |
529 | 54936004 | bellard | } |
530 | 3b46e624 | ths | |
531 | c8a706fe | pbrook | ret = 0;
|
532 | 54936004 | bellard | /* unmap what we can */
|
533 | 53a5960a | pbrook | if (real_start < real_end) {
|
534 | 4118a970 | j_mayer | ret = munmap(g2h(real_start), real_end - real_start); |
535 | 54936004 | bellard | } |
536 | 54936004 | bellard | |
537 | c8a706fe | pbrook | if (ret == 0) |
538 | c8a706fe | pbrook | page_set_flags(start, start + len, 0);
|
539 | c8a706fe | pbrook | mmap_unlock(); |
540 | c8a706fe | pbrook | return ret;
|
541 | 54936004 | bellard | } |
542 | 54936004 | bellard | |
543 | 992f48a0 | blueswir1 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
544 | 992f48a0 | blueswir1 | abi_ulong new_size, unsigned long flags, |
545 | 992f48a0 | blueswir1 | abi_ulong new_addr) |
546 | 54936004 | bellard | { |
547 | 54936004 | bellard | int prot;
|
548 | f19412a2 | aurel32 | void *host_addr;
|
549 | 54936004 | bellard | |
550 | c8a706fe | pbrook | mmap_lock(); |
551 | f19412a2 | aurel32 | |
552 | f19412a2 | aurel32 | if (flags & MREMAP_FIXED)
|
553 | 3af72a4d | blueswir1 | host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
|
554 | 3af72a4d | blueswir1 | old_size, new_size, |
555 | 3af72a4d | blueswir1 | flags, |
556 | 3af72a4d | blueswir1 | new_addr); |
557 | f19412a2 | aurel32 | else if (flags & MREMAP_MAYMOVE) { |
558 | f19412a2 | aurel32 | abi_ulong mmap_start; |
559 | f19412a2 | aurel32 | |
560 | f19412a2 | aurel32 | mmap_start = mmap_find_vma(0, new_size);
|
561 | f19412a2 | aurel32 | |
562 | f19412a2 | aurel32 | if (mmap_start == -1) { |
563 | f19412a2 | aurel32 | errno = ENOMEM; |
564 | f19412a2 | aurel32 | host_addr = MAP_FAILED; |
565 | f19412a2 | aurel32 | } else
|
566 | 3af72a4d | blueswir1 | host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
|
567 | 3af72a4d | blueswir1 | old_size, new_size, |
568 | 3af72a4d | blueswir1 | flags | MREMAP_FIXED, |
569 | 3af72a4d | blueswir1 | g2h(mmap_start)); |
570 | 3af72a4d | blueswir1 | } else {
|
571 | f19412a2 | aurel32 | host_addr = mremap(g2h(old_addr), old_size, new_size, flags); |
572 | f19412a2 | aurel32 | /* Check if address fits target address space */
|
573 | f19412a2 | aurel32 | if ((unsigned long)host_addr + new_size > (abi_ulong)-1) { |
574 | f19412a2 | aurel32 | /* Revert mremap() changes */
|
575 | f19412a2 | aurel32 | host_addr = mremap(g2h(old_addr), new_size, old_size, flags); |
576 | f19412a2 | aurel32 | errno = ENOMEM; |
577 | f19412a2 | aurel32 | host_addr = MAP_FAILED; |
578 | f19412a2 | aurel32 | } |
579 | f19412a2 | aurel32 | } |
580 | f19412a2 | aurel32 | |
581 | f19412a2 | aurel32 | if (host_addr == MAP_FAILED) {
|
582 | c8a706fe | pbrook | new_addr = -1;
|
583 | c8a706fe | pbrook | } else {
|
584 | c8a706fe | pbrook | new_addr = h2g(host_addr); |
585 | c8a706fe | pbrook | prot = page_get_flags(old_addr); |
586 | c8a706fe | pbrook | page_set_flags(old_addr, old_addr + old_size, 0);
|
587 | c8a706fe | pbrook | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
588 | c8a706fe | pbrook | } |
589 | c8a706fe | pbrook | mmap_unlock(); |
590 | 54936004 | bellard | return new_addr;
|
591 | 54936004 | bellard | } |
592 | 54936004 | bellard | |
593 | 992f48a0 | blueswir1 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
594 | 54936004 | bellard | { |
595 | 992f48a0 | blueswir1 | abi_ulong end; |
596 | 54936004 | bellard | |
597 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
|
598 | 54936004 | bellard | return -EINVAL;
|
599 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
600 | 54936004 | bellard | end = start + len; |
601 | d418c81e | bellard | if (end < start)
|
602 | d418c81e | bellard | return -EINVAL;
|
603 | d418c81e | bellard | if (end == start)
|
604 | d418c81e | bellard | return 0; |
605 | 3b46e624 | ths | |
606 | 83fb7adf | bellard | start &= qemu_host_page_mask; |
607 | 53a5960a | pbrook | return msync(g2h(start), end - start, flags);
|
608 | 54936004 | bellard | } |