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1 | 84778508 | blueswir1 | /*
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2 | 84778508 | blueswir1 | * mmap support for qemu
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3 | 84778508 | blueswir1 | *
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4 | 84778508 | blueswir1 | * Copyright (c) 2003 - 2008 Fabrice Bellard
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5 | 84778508 | blueswir1 | *
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6 | 84778508 | blueswir1 | * This program is free software; you can redistribute it and/or modify
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7 | 84778508 | blueswir1 | * it under the terms of the GNU General Public License as published by
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8 | 84778508 | blueswir1 | * the Free Software Foundation; either version 2 of the License, or
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9 | 84778508 | blueswir1 | * (at your option) any later version.
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10 | 84778508 | blueswir1 | *
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11 | 84778508 | blueswir1 | * This program is distributed in the hope that it will be useful,
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12 | 84778508 | blueswir1 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 84778508 | blueswir1 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 84778508 | blueswir1 | * GNU General Public License for more details.
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15 | 84778508 | blueswir1 | *
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16 | 84778508 | blueswir1 | * You should have received a copy of the GNU General Public License
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17 | 84778508 | blueswir1 | * 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 | 84778508 | blueswir1 | */
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21 | 84778508 | blueswir1 | #include <stdlib.h> |
22 | 84778508 | blueswir1 | #include <stdio.h> |
23 | 84778508 | blueswir1 | #include <stdarg.h> |
24 | 84778508 | blueswir1 | #include <string.h> |
25 | 84778508 | blueswir1 | #include <unistd.h> |
26 | 84778508 | blueswir1 | #include <errno.h> |
27 | 84778508 | blueswir1 | #include <sys/mman.h> |
28 | 84778508 | blueswir1 | |
29 | 84778508 | blueswir1 | #include "qemu.h" |
30 | 84778508 | blueswir1 | #include "qemu-common.h" |
31 | 6c173b3c | blueswir1 | #include "bsd-mman.h" |
32 | 84778508 | blueswir1 | |
33 | 84778508 | blueswir1 | //#define DEBUG_MMAP
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34 | 84778508 | blueswir1 | |
35 | 84778508 | blueswir1 | #if defined(USE_NPTL)
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36 | 84778508 | blueswir1 | pthread_mutex_t mmap_mutex; |
37 | 84778508 | blueswir1 | static int __thread mmap_lock_count; |
38 | 84778508 | blueswir1 | |
39 | 84778508 | blueswir1 | void mmap_lock(void) |
40 | 84778508 | blueswir1 | { |
41 | 84778508 | blueswir1 | if (mmap_lock_count++ == 0) { |
42 | 84778508 | blueswir1 | pthread_mutex_lock(&mmap_mutex); |
43 | 84778508 | blueswir1 | } |
44 | 84778508 | blueswir1 | } |
45 | 84778508 | blueswir1 | |
46 | 84778508 | blueswir1 | void mmap_unlock(void) |
47 | 84778508 | blueswir1 | { |
48 | 84778508 | blueswir1 | if (--mmap_lock_count == 0) { |
49 | 84778508 | blueswir1 | pthread_mutex_unlock(&mmap_mutex); |
50 | 84778508 | blueswir1 | } |
51 | 84778508 | blueswir1 | } |
52 | 84778508 | blueswir1 | |
53 | 84778508 | blueswir1 | /* Grab lock to make sure things are in a consistent state after fork(). */
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54 | 84778508 | blueswir1 | void mmap_fork_start(void) |
55 | 84778508 | blueswir1 | { |
56 | 84778508 | blueswir1 | if (mmap_lock_count)
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57 | 84778508 | blueswir1 | abort(); |
58 | 84778508 | blueswir1 | pthread_mutex_lock(&mmap_mutex); |
59 | 84778508 | blueswir1 | } |
60 | 84778508 | blueswir1 | |
61 | 84778508 | blueswir1 | void mmap_fork_end(int child) |
62 | 84778508 | blueswir1 | { |
63 | 84778508 | blueswir1 | if (child)
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64 | 84778508 | blueswir1 | pthread_mutex_init(&mmap_mutex, NULL);
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65 | 84778508 | blueswir1 | else
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66 | 84778508 | blueswir1 | pthread_mutex_unlock(&mmap_mutex); |
67 | 84778508 | blueswir1 | } |
68 | 84778508 | blueswir1 | #else
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69 | 84778508 | blueswir1 | /* We aren't threadsafe to start with, so no need to worry about locking. */
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70 | 84778508 | blueswir1 | void mmap_lock(void) |
71 | 84778508 | blueswir1 | { |
72 | 84778508 | blueswir1 | } |
73 | 84778508 | blueswir1 | |
74 | 84778508 | blueswir1 | void mmap_unlock(void) |
75 | 84778508 | blueswir1 | { |
76 | 84778508 | blueswir1 | } |
77 | 84778508 | blueswir1 | #endif
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78 | 84778508 | blueswir1 | |
79 | 84778508 | blueswir1 | void *qemu_vmalloc(size_t size)
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80 | 84778508 | blueswir1 | { |
81 | 84778508 | blueswir1 | void *p;
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82 | 84778508 | blueswir1 | unsigned long addr; |
83 | 84778508 | blueswir1 | mmap_lock(); |
84 | 84778508 | blueswir1 | /* Use map and mark the pages as used. */
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85 | 84778508 | blueswir1 | p = mmap(NULL, size, PROT_READ | PROT_WRITE,
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86 | 84778508 | blueswir1 | MAP_PRIVATE | MAP_ANON, -1, 0); |
87 | 84778508 | blueswir1 | |
88 | 84778508 | blueswir1 | addr = (unsigned long)p; |
89 | 84778508 | blueswir1 | if (addr == (target_ulong) addr) {
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90 | 84778508 | blueswir1 | /* Allocated region overlaps guest address space.
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91 | 84778508 | blueswir1 | This may recurse. */
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92 | 84778508 | blueswir1 | page_set_flags(addr & TARGET_PAGE_MASK, TARGET_PAGE_ALIGN(addr + size), |
93 | 84778508 | blueswir1 | PAGE_RESERVED); |
94 | 84778508 | blueswir1 | } |
95 | 84778508 | blueswir1 | |
96 | 84778508 | blueswir1 | mmap_unlock(); |
97 | 84778508 | blueswir1 | return p;
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98 | 84778508 | blueswir1 | } |
99 | 84778508 | blueswir1 | |
100 | 84778508 | blueswir1 | void *qemu_malloc(size_t size)
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101 | 84778508 | blueswir1 | { |
102 | 84778508 | blueswir1 | char * p;
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103 | 84778508 | blueswir1 | size += 16;
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104 | 84778508 | blueswir1 | p = qemu_vmalloc(size); |
105 | 84778508 | blueswir1 | *(size_t *)p = size; |
106 | 84778508 | blueswir1 | return p + 16; |
107 | 84778508 | blueswir1 | } |
108 | 84778508 | blueswir1 | |
109 | 84778508 | blueswir1 | /* We use map, which is always zero initialized. */
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110 | 84778508 | blueswir1 | void * qemu_mallocz(size_t size)
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111 | 84778508 | blueswir1 | { |
112 | 84778508 | blueswir1 | return qemu_malloc(size);
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113 | 84778508 | blueswir1 | } |
114 | 84778508 | blueswir1 | |
115 | 84778508 | blueswir1 | void qemu_free(void *ptr) |
116 | 84778508 | blueswir1 | { |
117 | 84778508 | blueswir1 | /* FIXME: We should unmark the reserved pages here. However this gets
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118 | 84778508 | blueswir1 | complicated when one target page spans multiple host pages, so we
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119 | 84778508 | blueswir1 | don't bother. */
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120 | 84778508 | blueswir1 | size_t *p; |
121 | 84778508 | blueswir1 | p = (size_t *)((char *)ptr - 16); |
122 | 84778508 | blueswir1 | munmap(p, *p); |
123 | 84778508 | blueswir1 | } |
124 | 84778508 | blueswir1 | |
125 | 004c9ef4 | blueswir1 | void *qemu_realloc(void *ptr, size_t size) |
126 | 004c9ef4 | blueswir1 | { |
127 | 004c9ef4 | blueswir1 | size_t old_size, copy; |
128 | 004c9ef4 | blueswir1 | void *new_ptr;
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129 | 004c9ef4 | blueswir1 | |
130 | baa8c602 | malc | if (!ptr)
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131 | baa8c602 | malc | return qemu_malloc(size);
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132 | 004c9ef4 | blueswir1 | old_size = *(size_t *)((char *)ptr - 16); |
133 | 004c9ef4 | blueswir1 | copy = old_size < size ? old_size : size; |
134 | 004c9ef4 | blueswir1 | new_ptr = qemu_malloc(size); |
135 | 004c9ef4 | blueswir1 | memcpy(new_ptr, ptr, copy); |
136 | 004c9ef4 | blueswir1 | qemu_free(ptr); |
137 | 004c9ef4 | blueswir1 | return new_ptr;
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138 | 004c9ef4 | blueswir1 | } |
139 | 004c9ef4 | blueswir1 | |
140 | 84778508 | blueswir1 | /* NOTE: all the constants are the HOST ones, but addresses are target. */
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141 | 84778508 | blueswir1 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
142 | 84778508 | blueswir1 | { |
143 | 84778508 | blueswir1 | abi_ulong end, host_start, host_end, addr; |
144 | 84778508 | blueswir1 | int prot1, ret;
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145 | 84778508 | blueswir1 | |
146 | 84778508 | blueswir1 | #ifdef DEBUG_MMAP
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147 | 84778508 | blueswir1 | printf("mprotect: start=0x" TARGET_FMT_lx
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148 | 84778508 | blueswir1 | " len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
149 | 84778508 | blueswir1 | prot & PROT_READ ? 'r' : '-', |
150 | 84778508 | blueswir1 | prot & PROT_WRITE ? 'w' : '-', |
151 | 84778508 | blueswir1 | prot & PROT_EXEC ? 'x' : '-'); |
152 | 84778508 | blueswir1 | #endif
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153 | 84778508 | blueswir1 | |
154 | 84778508 | blueswir1 | if ((start & ~TARGET_PAGE_MASK) != 0) |
155 | 84778508 | blueswir1 | return -EINVAL;
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156 | 84778508 | blueswir1 | len = TARGET_PAGE_ALIGN(len); |
157 | 84778508 | blueswir1 | end = start + len; |
158 | 84778508 | blueswir1 | if (end < start)
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159 | 84778508 | blueswir1 | return -EINVAL;
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160 | 84778508 | blueswir1 | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
161 | 84778508 | blueswir1 | if (len == 0) |
162 | 84778508 | blueswir1 | return 0; |
163 | 84778508 | blueswir1 | |
164 | 84778508 | blueswir1 | mmap_lock(); |
165 | 84778508 | blueswir1 | host_start = start & qemu_host_page_mask; |
166 | 84778508 | blueswir1 | host_end = HOST_PAGE_ALIGN(end); |
167 | 84778508 | blueswir1 | if (start > host_start) {
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168 | 84778508 | blueswir1 | /* handle host page containing start */
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169 | 84778508 | blueswir1 | prot1 = prot; |
170 | 84778508 | blueswir1 | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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171 | 84778508 | blueswir1 | prot1 |= page_get_flags(addr); |
172 | 84778508 | blueswir1 | } |
173 | 84778508 | blueswir1 | if (host_end == host_start + qemu_host_page_size) {
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174 | 84778508 | blueswir1 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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175 | 84778508 | blueswir1 | prot1 |= page_get_flags(addr); |
176 | 84778508 | blueswir1 | } |
177 | 84778508 | blueswir1 | end = host_end; |
178 | 84778508 | blueswir1 | } |
179 | 84778508 | blueswir1 | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
180 | 84778508 | blueswir1 | if (ret != 0) |
181 | 84778508 | blueswir1 | goto error;
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182 | 84778508 | blueswir1 | host_start += qemu_host_page_size; |
183 | 84778508 | blueswir1 | } |
184 | 84778508 | blueswir1 | if (end < host_end) {
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185 | 84778508 | blueswir1 | prot1 = prot; |
186 | 84778508 | blueswir1 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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187 | 84778508 | blueswir1 | prot1 |= page_get_flags(addr); |
188 | 84778508 | blueswir1 | } |
189 | 84778508 | blueswir1 | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
190 | 84778508 | blueswir1 | prot1 & PAGE_BITS); |
191 | 84778508 | blueswir1 | if (ret != 0) |
192 | 84778508 | blueswir1 | goto error;
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193 | 84778508 | blueswir1 | host_end -= qemu_host_page_size; |
194 | 84778508 | blueswir1 | } |
195 | 84778508 | blueswir1 | |
196 | 84778508 | blueswir1 | /* handle the pages in the middle */
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197 | 84778508 | blueswir1 | if (host_start < host_end) {
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198 | 84778508 | blueswir1 | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
199 | 84778508 | blueswir1 | if (ret != 0) |
200 | 84778508 | blueswir1 | goto error;
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201 | 84778508 | blueswir1 | } |
202 | 84778508 | blueswir1 | page_set_flags(start, start + len, prot | PAGE_VALID); |
203 | 84778508 | blueswir1 | mmap_unlock(); |
204 | 84778508 | blueswir1 | return 0; |
205 | 84778508 | blueswir1 | error:
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206 | 84778508 | blueswir1 | mmap_unlock(); |
207 | 84778508 | blueswir1 | return ret;
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208 | 84778508 | blueswir1 | } |
209 | 84778508 | blueswir1 | |
210 | 84778508 | blueswir1 | /* map an incomplete host page */
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211 | 84778508 | blueswir1 | static int mmap_frag(abi_ulong real_start, |
212 | 84778508 | blueswir1 | abi_ulong start, abi_ulong end, |
213 | 84778508 | blueswir1 | int prot, int flags, int fd, abi_ulong offset) |
214 | 84778508 | blueswir1 | { |
215 | 84778508 | blueswir1 | abi_ulong real_end, addr; |
216 | 84778508 | blueswir1 | void *host_start;
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217 | 84778508 | blueswir1 | int prot1, prot_new;
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218 | 84778508 | blueswir1 | |
219 | 84778508 | blueswir1 | real_end = real_start + qemu_host_page_size; |
220 | 84778508 | blueswir1 | host_start = g2h(real_start); |
221 | 84778508 | blueswir1 | |
222 | 84778508 | blueswir1 | /* get the protection of the target pages outside the mapping */
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223 | 84778508 | blueswir1 | prot1 = 0;
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224 | 84778508 | blueswir1 | for(addr = real_start; addr < real_end; addr++) {
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225 | 84778508 | blueswir1 | if (addr < start || addr >= end)
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226 | 84778508 | blueswir1 | prot1 |= page_get_flags(addr); |
227 | 84778508 | blueswir1 | } |
228 | 84778508 | blueswir1 | |
229 | 84778508 | blueswir1 | if (prot1 == 0) { |
230 | 84778508 | blueswir1 | /* no page was there, so we allocate one */
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231 | 84778508 | blueswir1 | void *p = mmap(host_start, qemu_host_page_size, prot,
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232 | 84778508 | blueswir1 | flags | MAP_ANON, -1, 0); |
233 | 84778508 | blueswir1 | if (p == MAP_FAILED)
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234 | 84778508 | blueswir1 | return -1; |
235 | 84778508 | blueswir1 | prot1 = prot; |
236 | 84778508 | blueswir1 | } |
237 | 84778508 | blueswir1 | prot1 &= PAGE_BITS; |
238 | 84778508 | blueswir1 | |
239 | 84778508 | blueswir1 | prot_new = prot | prot1; |
240 | 84778508 | blueswir1 | if (!(flags & MAP_ANON)) {
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241 | 84778508 | blueswir1 | /* msync() won't work here, so we return an error if write is
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242 | 84778508 | blueswir1 | possible while it is a shared mapping */
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243 | 6c173b3c | blueswir1 | if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
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244 | 84778508 | blueswir1 | (prot & PROT_WRITE)) |
245 | 84778508 | blueswir1 | return -EINVAL;
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246 | 84778508 | blueswir1 | |
247 | 84778508 | blueswir1 | /* adjust protection to be able to read */
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248 | 84778508 | blueswir1 | if (!(prot1 & PROT_WRITE))
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249 | 84778508 | blueswir1 | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
250 | 84778508 | blueswir1 | |
251 | 84778508 | blueswir1 | /* read the corresponding file data */
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252 | 84778508 | blueswir1 | pread(fd, g2h(start), end - start, offset); |
253 | 84778508 | blueswir1 | |
254 | 84778508 | blueswir1 | /* put final protection */
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255 | 84778508 | blueswir1 | if (prot_new != (prot1 | PROT_WRITE))
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256 | 84778508 | blueswir1 | mprotect(host_start, qemu_host_page_size, prot_new); |
257 | 84778508 | blueswir1 | } else {
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258 | 84778508 | blueswir1 | /* just update the protection */
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259 | 84778508 | blueswir1 | if (prot_new != prot1) {
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260 | 84778508 | blueswir1 | mprotect(host_start, qemu_host_page_size, prot_new); |
261 | 84778508 | blueswir1 | } |
262 | 84778508 | blueswir1 | } |
263 | 84778508 | blueswir1 | return 0; |
264 | 84778508 | blueswir1 | } |
265 | 84778508 | blueswir1 | |
266 | 84778508 | blueswir1 | #if defined(__CYGWIN__)
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267 | 84778508 | blueswir1 | /* Cygwin doesn't have a whole lot of address space. */
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268 | 84778508 | blueswir1 | static abi_ulong mmap_next_start = 0x18000000; |
269 | 84778508 | blueswir1 | #else
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270 | 84778508 | blueswir1 | static abi_ulong mmap_next_start = 0x40000000; |
271 | 84778508 | blueswir1 | #endif
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272 | 84778508 | blueswir1 | |
273 | 84778508 | blueswir1 | unsigned long last_brk; |
274 | 84778508 | blueswir1 | |
275 | 84778508 | blueswir1 | /* find a free memory area of size 'size'. The search starts at
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276 | 84778508 | blueswir1 | 'start'. If 'start' == 0, then a default start address is used.
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277 | 84778508 | blueswir1 | Return -1 if error.
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278 | 84778508 | blueswir1 | */
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279 | 84778508 | blueswir1 | /* page_init() marks pages used by the host as reserved to be sure not
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280 | 84778508 | blueswir1 | to use them. */
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281 | 84778508 | blueswir1 | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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282 | 84778508 | blueswir1 | { |
283 | 84778508 | blueswir1 | abi_ulong addr, addr1, addr_start; |
284 | 84778508 | blueswir1 | int prot;
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285 | 84778508 | blueswir1 | unsigned long new_brk; |
286 | 84778508 | blueswir1 | |
287 | 84778508 | blueswir1 | new_brk = (unsigned long)sbrk(0); |
288 | 84778508 | blueswir1 | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
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289 | 84778508 | blueswir1 | /* This is a hack to catch the host allocating memory with brk().
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290 | 84778508 | blueswir1 | If it uses mmap then we loose.
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291 | 84778508 | blueswir1 | FIXME: We really want to avoid the host allocating memory in
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292 | 84778508 | blueswir1 | the first place, and maybe leave some slack to avoid switching
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293 | 84778508 | blueswir1 | to mmap. */
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294 | 84778508 | blueswir1 | page_set_flags(last_brk & TARGET_PAGE_MASK, |
295 | 84778508 | blueswir1 | TARGET_PAGE_ALIGN(new_brk), |
296 | 84778508 | blueswir1 | PAGE_RESERVED); |
297 | 84778508 | blueswir1 | } |
298 | 84778508 | blueswir1 | last_brk = new_brk; |
299 | 84778508 | blueswir1 | |
300 | 84778508 | blueswir1 | size = HOST_PAGE_ALIGN(size); |
301 | 84778508 | blueswir1 | start = start & qemu_host_page_mask; |
302 | 84778508 | blueswir1 | addr = start; |
303 | 84778508 | blueswir1 | if (addr == 0) |
304 | 84778508 | blueswir1 | addr = mmap_next_start; |
305 | 84778508 | blueswir1 | addr_start = addr; |
306 | 84778508 | blueswir1 | for(;;) {
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307 | 84778508 | blueswir1 | prot = 0;
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308 | 84778508 | blueswir1 | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
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309 | 84778508 | blueswir1 | prot |= page_get_flags(addr1); |
310 | 84778508 | blueswir1 | } |
311 | 84778508 | blueswir1 | if (prot == 0) |
312 | 84778508 | blueswir1 | break;
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313 | 84778508 | blueswir1 | addr += qemu_host_page_size; |
314 | 84778508 | blueswir1 | /* we found nothing */
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315 | 84778508 | blueswir1 | if (addr == addr_start)
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316 | 84778508 | blueswir1 | return (abi_ulong)-1; |
317 | 84778508 | blueswir1 | } |
318 | 84778508 | blueswir1 | if (start == 0) |
319 | 84778508 | blueswir1 | mmap_next_start = addr + size; |
320 | 84778508 | blueswir1 | return addr;
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321 | 84778508 | blueswir1 | } |
322 | 84778508 | blueswir1 | |
323 | 84778508 | blueswir1 | /* NOTE: all the constants are the HOST ones */
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324 | 84778508 | blueswir1 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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325 | 84778508 | blueswir1 | int flags, int fd, abi_ulong offset) |
326 | 84778508 | blueswir1 | { |
327 | 84778508 | blueswir1 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
328 | 84778508 | blueswir1 | unsigned long host_start; |
329 | 84778508 | blueswir1 | |
330 | 84778508 | blueswir1 | mmap_lock(); |
331 | 84778508 | blueswir1 | #ifdef DEBUG_MMAP
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332 | 84778508 | blueswir1 | { |
333 | 84778508 | blueswir1 | printf("mmap: start=0x" TARGET_FMT_lx
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334 | 84778508 | blueswir1 | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
335 | 84778508 | blueswir1 | start, len, |
336 | 84778508 | blueswir1 | prot & PROT_READ ? 'r' : '-', |
337 | 84778508 | blueswir1 | prot & PROT_WRITE ? 'w' : '-', |
338 | 84778508 | blueswir1 | prot & PROT_EXEC ? 'x' : '-'); |
339 | 84778508 | blueswir1 | if (flags & MAP_FIXED)
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340 | 84778508 | blueswir1 | printf("MAP_FIXED ");
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341 | 84778508 | blueswir1 | if (flags & MAP_ANON)
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342 | 84778508 | blueswir1 | printf("MAP_ANON ");
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343 | 6c173b3c | blueswir1 | switch(flags & TARGET_BSD_MAP_FLAGMASK) {
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344 | 84778508 | blueswir1 | case MAP_PRIVATE:
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345 | 84778508 | blueswir1 | printf("MAP_PRIVATE ");
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346 | 84778508 | blueswir1 | break;
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347 | 84778508 | blueswir1 | case MAP_SHARED:
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348 | 84778508 | blueswir1 | printf("MAP_SHARED ");
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349 | 84778508 | blueswir1 | break;
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350 | 84778508 | blueswir1 | default:
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351 | 6c173b3c | blueswir1 | printf("[MAP_FLAGMASK=0x%x] ", flags & TARGET_BSD_MAP_FLAGMASK);
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352 | 84778508 | blueswir1 | break;
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353 | 84778508 | blueswir1 | } |
354 | 84778508 | blueswir1 | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
355 | 84778508 | blueswir1 | } |
356 | 84778508 | blueswir1 | #endif
|
357 | 84778508 | blueswir1 | |
358 | 84778508 | blueswir1 | if (offset & ~TARGET_PAGE_MASK) {
|
359 | 84778508 | blueswir1 | errno = EINVAL; |
360 | 84778508 | blueswir1 | goto fail;
|
361 | 84778508 | blueswir1 | } |
362 | 84778508 | blueswir1 | |
363 | 84778508 | blueswir1 | len = TARGET_PAGE_ALIGN(len); |
364 | 84778508 | blueswir1 | if (len == 0) |
365 | 84778508 | blueswir1 | goto the_end;
|
366 | 84778508 | blueswir1 | real_start = start & qemu_host_page_mask; |
367 | 84778508 | blueswir1 | |
368 | 84778508 | blueswir1 | if (!(flags & MAP_FIXED)) {
|
369 | 84778508 | blueswir1 | abi_ulong mmap_start; |
370 | 84778508 | blueswir1 | void *p;
|
371 | 84778508 | blueswir1 | host_offset = offset & qemu_host_page_mask; |
372 | 84778508 | blueswir1 | host_len = len + offset - host_offset; |
373 | 84778508 | blueswir1 | host_len = HOST_PAGE_ALIGN(host_len); |
374 | 84778508 | blueswir1 | mmap_start = mmap_find_vma(real_start, host_len); |
375 | 84778508 | blueswir1 | if (mmap_start == (abi_ulong)-1) { |
376 | 84778508 | blueswir1 | errno = ENOMEM; |
377 | 84778508 | blueswir1 | goto fail;
|
378 | 84778508 | blueswir1 | } |
379 | 84778508 | blueswir1 | /* Note: we prefer to control the mapping address. It is
|
380 | 84778508 | blueswir1 | especially important if qemu_host_page_size >
|
381 | 84778508 | blueswir1 | qemu_real_host_page_size */
|
382 | 84778508 | blueswir1 | p = mmap(g2h(mmap_start), |
383 | 84778508 | blueswir1 | host_len, prot, flags | MAP_FIXED, fd, host_offset); |
384 | 84778508 | blueswir1 | if (p == MAP_FAILED)
|
385 | 84778508 | blueswir1 | goto fail;
|
386 | 84778508 | blueswir1 | /* update start so that it points to the file position at 'offset' */
|
387 | 84778508 | blueswir1 | host_start = (unsigned long)p; |
388 | 84778508 | blueswir1 | if (!(flags & MAP_ANON))
|
389 | 84778508 | blueswir1 | host_start += offset - host_offset; |
390 | 84778508 | blueswir1 | start = h2g(host_start); |
391 | 84778508 | blueswir1 | } else {
|
392 | 84778508 | blueswir1 | int flg;
|
393 | 84778508 | blueswir1 | target_ulong addr; |
394 | 84778508 | blueswir1 | |
395 | 84778508 | blueswir1 | if (start & ~TARGET_PAGE_MASK) {
|
396 | 84778508 | blueswir1 | errno = EINVAL; |
397 | 84778508 | blueswir1 | goto fail;
|
398 | 84778508 | blueswir1 | } |
399 | 84778508 | blueswir1 | end = start + len; |
400 | 84778508 | blueswir1 | real_end = HOST_PAGE_ALIGN(end); |
401 | 84778508 | blueswir1 | |
402 | 84778508 | blueswir1 | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
403 | 84778508 | blueswir1 | flg = page_get_flags(addr); |
404 | 84778508 | blueswir1 | if (flg & PAGE_RESERVED) {
|
405 | 84778508 | blueswir1 | errno = ENXIO; |
406 | 84778508 | blueswir1 | goto fail;
|
407 | 84778508 | blueswir1 | } |
408 | 84778508 | blueswir1 | } |
409 | 84778508 | blueswir1 | |
410 | 84778508 | blueswir1 | /* worst case: we cannot map the file because the offset is not
|
411 | 84778508 | blueswir1 | aligned, so we read it */
|
412 | 84778508 | blueswir1 | if (!(flags & MAP_ANON) &&
|
413 | 84778508 | blueswir1 | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
414 | 84778508 | blueswir1 | /* msync() won't work here, so we return an error if write is
|
415 | 84778508 | blueswir1 | possible while it is a shared mapping */
|
416 | 6c173b3c | blueswir1 | if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED &&
|
417 | 84778508 | blueswir1 | (prot & PROT_WRITE)) { |
418 | 84778508 | blueswir1 | errno = EINVAL; |
419 | 84778508 | blueswir1 | goto fail;
|
420 | 84778508 | blueswir1 | } |
421 | 84778508 | blueswir1 | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
422 | 84778508 | blueswir1 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, |
423 | 84778508 | blueswir1 | -1, 0); |
424 | 84778508 | blueswir1 | if (retaddr == -1) |
425 | 84778508 | blueswir1 | goto fail;
|
426 | 84778508 | blueswir1 | pread(fd, g2h(start), len, offset); |
427 | 84778508 | blueswir1 | if (!(prot & PROT_WRITE)) {
|
428 | 84778508 | blueswir1 | ret = target_mprotect(start, len, prot); |
429 | 84778508 | blueswir1 | if (ret != 0) { |
430 | 84778508 | blueswir1 | start = ret; |
431 | 84778508 | blueswir1 | goto the_end;
|
432 | 84778508 | blueswir1 | } |
433 | 84778508 | blueswir1 | } |
434 | 84778508 | blueswir1 | goto the_end;
|
435 | 84778508 | blueswir1 | } |
436 | 84778508 | blueswir1 | |
437 | 84778508 | blueswir1 | /* handle the start of the mapping */
|
438 | 84778508 | blueswir1 | if (start > real_start) {
|
439 | 84778508 | blueswir1 | if (real_end == real_start + qemu_host_page_size) {
|
440 | 84778508 | blueswir1 | /* one single host page */
|
441 | 84778508 | blueswir1 | ret = mmap_frag(real_start, start, end, |
442 | 84778508 | blueswir1 | prot, flags, fd, offset); |
443 | 84778508 | blueswir1 | if (ret == -1) |
444 | 84778508 | blueswir1 | goto fail;
|
445 | 84778508 | blueswir1 | goto the_end1;
|
446 | 84778508 | blueswir1 | } |
447 | 84778508 | blueswir1 | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, |
448 | 84778508 | blueswir1 | prot, flags, fd, offset); |
449 | 84778508 | blueswir1 | if (ret == -1) |
450 | 84778508 | blueswir1 | goto fail;
|
451 | 84778508 | blueswir1 | real_start += qemu_host_page_size; |
452 | 84778508 | blueswir1 | } |
453 | 84778508 | blueswir1 | /* handle the end of the mapping */
|
454 | 84778508 | blueswir1 | if (end < real_end) {
|
455 | 84778508 | blueswir1 | ret = mmap_frag(real_end - qemu_host_page_size, |
456 | 84778508 | blueswir1 | real_end - qemu_host_page_size, real_end, |
457 | 84778508 | blueswir1 | prot, flags, fd, |
458 | 84778508 | blueswir1 | offset + real_end - qemu_host_page_size - start); |
459 | 84778508 | blueswir1 | if (ret == -1) |
460 | 84778508 | blueswir1 | goto fail;
|
461 | 84778508 | blueswir1 | real_end -= qemu_host_page_size; |
462 | 84778508 | blueswir1 | } |
463 | 84778508 | blueswir1 | |
464 | 84778508 | blueswir1 | /* map the middle (easier) */
|
465 | 84778508 | blueswir1 | if (real_start < real_end) {
|
466 | 84778508 | blueswir1 | void *p;
|
467 | 84778508 | blueswir1 | unsigned long offset1; |
468 | 84778508 | blueswir1 | if (flags & MAP_ANON)
|
469 | 84778508 | blueswir1 | offset1 = 0;
|
470 | 84778508 | blueswir1 | else
|
471 | 84778508 | blueswir1 | offset1 = offset + real_start - start; |
472 | 84778508 | blueswir1 | p = mmap(g2h(real_start), real_end - real_start, |
473 | 84778508 | blueswir1 | prot, flags, fd, offset1); |
474 | 84778508 | blueswir1 | if (p == MAP_FAILED)
|
475 | 84778508 | blueswir1 | goto fail;
|
476 | 84778508 | blueswir1 | } |
477 | 84778508 | blueswir1 | } |
478 | 84778508 | blueswir1 | the_end1:
|
479 | 84778508 | blueswir1 | page_set_flags(start, start + len, prot | PAGE_VALID); |
480 | 84778508 | blueswir1 | the_end:
|
481 | 84778508 | blueswir1 | #ifdef DEBUG_MMAP
|
482 | 84778508 | blueswir1 | printf("ret=0x" TARGET_FMT_lx "\n", start); |
483 | 84778508 | blueswir1 | page_dump(stdout); |
484 | 84778508 | blueswir1 | printf("\n");
|
485 | 84778508 | blueswir1 | #endif
|
486 | 84778508 | blueswir1 | mmap_unlock(); |
487 | 84778508 | blueswir1 | return start;
|
488 | 84778508 | blueswir1 | fail:
|
489 | 84778508 | blueswir1 | mmap_unlock(); |
490 | 84778508 | blueswir1 | return -1; |
491 | 84778508 | blueswir1 | } |
492 | 84778508 | blueswir1 | |
493 | 84778508 | blueswir1 | int target_munmap(abi_ulong start, abi_ulong len)
|
494 | 84778508 | blueswir1 | { |
495 | 84778508 | blueswir1 | abi_ulong end, real_start, real_end, addr; |
496 | 84778508 | blueswir1 | int prot, ret;
|
497 | 84778508 | blueswir1 | |
498 | 84778508 | blueswir1 | #ifdef DEBUG_MMAP
|
499 | 84778508 | blueswir1 | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
|
500 | 84778508 | blueswir1 | #endif
|
501 | 84778508 | blueswir1 | if (start & ~TARGET_PAGE_MASK)
|
502 | 84778508 | blueswir1 | return -EINVAL;
|
503 | 84778508 | blueswir1 | len = TARGET_PAGE_ALIGN(len); |
504 | 84778508 | blueswir1 | if (len == 0) |
505 | 84778508 | blueswir1 | return -EINVAL;
|
506 | 84778508 | blueswir1 | mmap_lock(); |
507 | 84778508 | blueswir1 | end = start + len; |
508 | 84778508 | blueswir1 | real_start = start & qemu_host_page_mask; |
509 | 84778508 | blueswir1 | real_end = HOST_PAGE_ALIGN(end); |
510 | 84778508 | blueswir1 | |
511 | 84778508 | blueswir1 | if (start > real_start) {
|
512 | 84778508 | blueswir1 | /* handle host page containing start */
|
513 | 84778508 | blueswir1 | prot = 0;
|
514 | 84778508 | blueswir1 | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
515 | 84778508 | blueswir1 | prot |= page_get_flags(addr); |
516 | 84778508 | blueswir1 | } |
517 | 84778508 | blueswir1 | if (real_end == real_start + qemu_host_page_size) {
|
518 | 84778508 | blueswir1 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
519 | 84778508 | blueswir1 | prot |= page_get_flags(addr); |
520 | 84778508 | blueswir1 | } |
521 | 84778508 | blueswir1 | end = real_end; |
522 | 84778508 | blueswir1 | } |
523 | 84778508 | blueswir1 | if (prot != 0) |
524 | 84778508 | blueswir1 | real_start += qemu_host_page_size; |
525 | 84778508 | blueswir1 | } |
526 | 84778508 | blueswir1 | if (end < real_end) {
|
527 | 84778508 | blueswir1 | prot = 0;
|
528 | 84778508 | blueswir1 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
529 | 84778508 | blueswir1 | prot |= page_get_flags(addr); |
530 | 84778508 | blueswir1 | } |
531 | 84778508 | blueswir1 | if (prot != 0) |
532 | 84778508 | blueswir1 | real_end -= qemu_host_page_size; |
533 | 84778508 | blueswir1 | } |
534 | 84778508 | blueswir1 | |
535 | 84778508 | blueswir1 | ret = 0;
|
536 | 84778508 | blueswir1 | /* unmap what we can */
|
537 | 84778508 | blueswir1 | if (real_start < real_end) {
|
538 | 84778508 | blueswir1 | ret = munmap(g2h(real_start), real_end - real_start); |
539 | 84778508 | blueswir1 | } |
540 | 84778508 | blueswir1 | |
541 | 84778508 | blueswir1 | if (ret == 0) |
542 | 84778508 | blueswir1 | page_set_flags(start, start + len, 0);
|
543 | 84778508 | blueswir1 | mmap_unlock(); |
544 | 84778508 | blueswir1 | return ret;
|
545 | 84778508 | blueswir1 | } |
546 | 84778508 | blueswir1 | |
547 | 84778508 | blueswir1 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
548 | 84778508 | blueswir1 | { |
549 | 84778508 | blueswir1 | abi_ulong end; |
550 | 84778508 | blueswir1 | |
551 | 84778508 | blueswir1 | if (start & ~TARGET_PAGE_MASK)
|
552 | 84778508 | blueswir1 | return -EINVAL;
|
553 | 84778508 | blueswir1 | len = TARGET_PAGE_ALIGN(len); |
554 | 84778508 | blueswir1 | end = start + len; |
555 | 84778508 | blueswir1 | if (end < start)
|
556 | 84778508 | blueswir1 | return -EINVAL;
|
557 | 84778508 | blueswir1 | if (end == start)
|
558 | 84778508 | blueswir1 | return 0; |
559 | 84778508 | blueswir1 | |
560 | 84778508 | blueswir1 | start &= qemu_host_page_mask; |
561 | 84778508 | blueswir1 | return msync(g2h(start), end - start, flags);
|
562 | 84778508 | blueswir1 | } |