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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 | 53a5960a | pbrook | /* NOTE: all the constants are the HOST ones, but addresses are target. */
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33 | 992f48a0 | blueswir1 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
34 | 54936004 | bellard | { |
35 | 992f48a0 | blueswir1 | abi_ulong end, host_start, host_end, addr; |
36 | 54936004 | bellard | int prot1, ret;
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37 | 54936004 | bellard | |
38 | 54936004 | bellard | #ifdef DEBUG_MMAP
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39 | a5b85f79 | ths | printf("mprotect: start=0x" TARGET_FMT_lx
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40 | 80210bcd | ths | "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
41 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
42 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
43 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
44 | 54936004 | bellard | #endif
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45 | 54936004 | bellard | |
46 | 54936004 | bellard | if ((start & ~TARGET_PAGE_MASK) != 0) |
47 | 54936004 | bellard | return -EINVAL;
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48 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
49 | 54936004 | bellard | end = start + len; |
50 | 54936004 | bellard | if (end < start)
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51 | 54936004 | bellard | return -EINVAL;
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52 | 171cd1cd | balrog | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
53 | 54936004 | bellard | if (len == 0) |
54 | 54936004 | bellard | return 0; |
55 | 3b46e624 | ths | |
56 | 83fb7adf | bellard | host_start = start & qemu_host_page_mask; |
57 | 54936004 | bellard | host_end = HOST_PAGE_ALIGN(end); |
58 | 54936004 | bellard | if (start > host_start) {
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59 | 54936004 | bellard | /* handle host page containing start */
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60 | 54936004 | bellard | prot1 = prot; |
61 | 54936004 | bellard | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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62 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
63 | 54936004 | bellard | } |
64 | 83fb7adf | bellard | if (host_end == host_start + qemu_host_page_size) {
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65 | d418c81e | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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66 | d418c81e | bellard | prot1 |= page_get_flags(addr); |
67 | d418c81e | bellard | } |
68 | d418c81e | bellard | end = host_end; |
69 | d418c81e | bellard | } |
70 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
71 | 54936004 | bellard | if (ret != 0) |
72 | 54936004 | bellard | return ret;
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73 | 83fb7adf | bellard | host_start += qemu_host_page_size; |
74 | 54936004 | bellard | } |
75 | 54936004 | bellard | if (end < host_end) {
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76 | 54936004 | bellard | prot1 = prot; |
77 | 54936004 | bellard | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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78 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
79 | 54936004 | bellard | } |
80 | 5fafdf24 | ths | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
81 | 54936004 | bellard | prot1 & PAGE_BITS); |
82 | 54936004 | bellard | if (ret != 0) |
83 | 54936004 | bellard | return ret;
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84 | 83fb7adf | bellard | host_end -= qemu_host_page_size; |
85 | 54936004 | bellard | } |
86 | 3b46e624 | ths | |
87 | 54936004 | bellard | /* handle the pages in the middle */
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88 | 54936004 | bellard | if (host_start < host_end) {
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89 | 53a5960a | pbrook | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
90 | 54936004 | bellard | if (ret != 0) |
91 | 54936004 | bellard | return ret;
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92 | 54936004 | bellard | } |
93 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
94 | 54936004 | bellard | return 0; |
95 | 54936004 | bellard | } |
96 | 54936004 | bellard | |
97 | 54936004 | bellard | /* map an incomplete host page */
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98 | 992f48a0 | blueswir1 | static int mmap_frag(abi_ulong real_start, |
99 | 992f48a0 | blueswir1 | abi_ulong start, abi_ulong end, |
100 | 992f48a0 | blueswir1 | int prot, int flags, int fd, abi_ulong offset) |
101 | 54936004 | bellard | { |
102 | 80210bcd | ths | abi_ulong real_end, addr; |
103 | 53a5960a | pbrook | void *host_start;
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104 | 54936004 | bellard | int prot1, prot_new;
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105 | 54936004 | bellard | |
106 | 53a5960a | pbrook | real_end = real_start + qemu_host_page_size; |
107 | 53a5960a | pbrook | host_start = g2h(real_start); |
108 | 54936004 | bellard | |
109 | 54936004 | bellard | /* get the protection of the target pages outside the mapping */
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110 | 54936004 | bellard | prot1 = 0;
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111 | 53a5960a | pbrook | for(addr = real_start; addr < real_end; addr++) {
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112 | 54936004 | bellard | if (addr < start || addr >= end)
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113 | 54936004 | bellard | prot1 |= page_get_flags(addr); |
114 | 54936004 | bellard | } |
115 | 3b46e624 | ths | |
116 | 54936004 | bellard | if (prot1 == 0) { |
117 | 54936004 | bellard | /* no page was there, so we allocate one */
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118 | 80210bcd | ths | void *p = mmap(host_start, qemu_host_page_size, prot,
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119 | 80210bcd | ths | flags | MAP_ANONYMOUS, -1, 0); |
120 | 80210bcd | ths | if (p == MAP_FAILED)
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121 | 80210bcd | ths | return -1; |
122 | 53a5960a | pbrook | prot1 = prot; |
123 | 54936004 | bellard | } |
124 | 54936004 | bellard | prot1 &= PAGE_BITS; |
125 | 54936004 | bellard | |
126 | 54936004 | bellard | prot_new = prot | prot1; |
127 | 54936004 | bellard | if (!(flags & MAP_ANONYMOUS)) {
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128 | 54936004 | bellard | /* msync() won't work here, so we return an error if write is
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129 | 54936004 | bellard | possible while it is a shared mapping */
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130 | 54936004 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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131 | 54936004 | bellard | (prot & PROT_WRITE)) |
132 | 54936004 | bellard | return -EINVAL;
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133 | 54936004 | bellard | |
134 | 54936004 | bellard | /* adjust protection to be able to read */
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135 | 54936004 | bellard | if (!(prot1 & PROT_WRITE))
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136 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
137 | 3b46e624 | ths | |
138 | 54936004 | bellard | /* read the corresponding file data */
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139 | 53a5960a | pbrook | pread(fd, g2h(start), end - start, offset); |
140 | 3b46e624 | ths | |
141 | 54936004 | bellard | /* put final protection */
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142 | 54936004 | bellard | if (prot_new != (prot1 | PROT_WRITE))
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143 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
144 | 54936004 | bellard | } else {
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145 | 54936004 | bellard | /* just update the protection */
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146 | 54936004 | bellard | if (prot_new != prot1) {
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147 | 53a5960a | pbrook | mprotect(host_start, qemu_host_page_size, prot_new); |
148 | 54936004 | bellard | } |
149 | 54936004 | bellard | } |
150 | 54936004 | bellard | return 0; |
151 | 54936004 | bellard | } |
152 | 54936004 | bellard | |
153 | a03e2d42 | bellard | #if defined(__CYGWIN__)
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154 | a03e2d42 | bellard | /* Cygwin doesn't have a whole lot of address space. */
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155 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x18000000; |
156 | a03e2d42 | bellard | #else
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157 | a03e2d42 | bellard | static abi_ulong mmap_next_start = 0x40000000; |
158 | a03e2d42 | bellard | #endif
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159 | a03e2d42 | bellard | |
160 | a03e2d42 | bellard | /* find a free memory area of size 'size'. The search starts at
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161 | a03e2d42 | bellard | 'start'. If 'start' == 0, then a default start address is used.
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162 | a03e2d42 | bellard | Return -1 if error.
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163 | a03e2d42 | bellard | */
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164 | 50a9569b | balrog | /* page_init() marks pages used by the host as reserved to be sure not
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165 | a03e2d42 | bellard | to use them. */
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166 | a03e2d42 | bellard | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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167 | a03e2d42 | bellard | { |
168 | a03e2d42 | bellard | abi_ulong addr, addr1, addr_start; |
169 | a03e2d42 | bellard | int prot;
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170 | a03e2d42 | bellard | |
171 | a03e2d42 | bellard | size = HOST_PAGE_ALIGN(size); |
172 | a03e2d42 | bellard | start = start & qemu_host_page_mask; |
173 | a03e2d42 | bellard | addr = start; |
174 | a03e2d42 | bellard | if (addr == 0) |
175 | a03e2d42 | bellard | addr = mmap_next_start; |
176 | a03e2d42 | bellard | addr_start = addr; |
177 | a03e2d42 | bellard | for(;;) {
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178 | a03e2d42 | bellard | prot = 0;
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179 | a03e2d42 | bellard | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) {
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180 | a03e2d42 | bellard | prot |= page_get_flags(addr1); |
181 | a03e2d42 | bellard | } |
182 | a03e2d42 | bellard | if (prot == 0) |
183 | a03e2d42 | bellard | break;
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184 | a03e2d42 | bellard | addr += qemu_host_page_size; |
185 | a03e2d42 | bellard | /* we found nothing */
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186 | a03e2d42 | bellard | if (addr == addr_start)
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187 | a03e2d42 | bellard | return (abi_ulong)-1; |
188 | a03e2d42 | bellard | } |
189 | a03e2d42 | bellard | if (start == 0) |
190 | a03e2d42 | bellard | mmap_next_start = addr + size; |
191 | a03e2d42 | bellard | return addr;
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192 | a03e2d42 | bellard | } |
193 | a03e2d42 | bellard | |
194 | 54936004 | bellard | /* NOTE: all the constants are the HOST ones */
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195 | 992f48a0 | blueswir1 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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196 | 992f48a0 | blueswir1 | int flags, int fd, abi_ulong offset) |
197 | 54936004 | bellard | { |
198 | 992f48a0 | blueswir1 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
199 | a5b85f79 | ths | unsigned long host_start; |
200 | 54936004 | bellard | |
201 | 54936004 | bellard | #ifdef DEBUG_MMAP
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202 | 54936004 | bellard | { |
203 | a5b85f79 | ths | printf("mmap: start=0x" TARGET_FMT_lx
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204 | 80210bcd | ths | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
205 | 5fafdf24 | ths | start, len, |
206 | 54936004 | bellard | prot & PROT_READ ? 'r' : '-', |
207 | 54936004 | bellard | prot & PROT_WRITE ? 'w' : '-', |
208 | 54936004 | bellard | prot & PROT_EXEC ? 'x' : '-'); |
209 | 54936004 | bellard | if (flags & MAP_FIXED)
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210 | 54936004 | bellard | printf("MAP_FIXED ");
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211 | 54936004 | bellard | if (flags & MAP_ANONYMOUS)
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212 | 54936004 | bellard | printf("MAP_ANON ");
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213 | 54936004 | bellard | switch(flags & MAP_TYPE) {
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214 | 54936004 | bellard | case MAP_PRIVATE:
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215 | 54936004 | bellard | printf("MAP_PRIVATE ");
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216 | 54936004 | bellard | break;
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217 | 54936004 | bellard | case MAP_SHARED:
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218 | 54936004 | bellard | printf("MAP_SHARED ");
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219 | 54936004 | bellard | break;
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220 | 54936004 | bellard | default:
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221 | 54936004 | bellard | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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222 | 54936004 | bellard | break;
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223 | 54936004 | bellard | } |
224 | a5b85f79 | ths | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
225 | 54936004 | bellard | } |
226 | 54936004 | bellard | #endif
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227 | 54936004 | bellard | |
228 | e89f07d3 | pbrook | if (offset & ~TARGET_PAGE_MASK) {
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229 | e89f07d3 | pbrook | errno = EINVAL; |
230 | e89f07d3 | pbrook | return -1; |
231 | e89f07d3 | pbrook | } |
232 | 54936004 | bellard | |
233 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
234 | 54936004 | bellard | if (len == 0) |
235 | 54936004 | bellard | return start;
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236 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
237 | 54936004 | bellard | |
238 | 54936004 | bellard | if (!(flags & MAP_FIXED)) {
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239 | a03e2d42 | bellard | abi_ulong mmap_start; |
240 | a03e2d42 | bellard | void *p;
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241 | a03e2d42 | bellard | host_offset = offset & qemu_host_page_mask; |
242 | a03e2d42 | bellard | host_len = len + offset - host_offset; |
243 | a03e2d42 | bellard | host_len = HOST_PAGE_ALIGN(host_len); |
244 | a03e2d42 | bellard | mmap_start = mmap_find_vma(real_start, host_len); |
245 | a03e2d42 | bellard | if (mmap_start == (abi_ulong)-1) { |
246 | a03e2d42 | bellard | errno = ENOMEM; |
247 | a03e2d42 | bellard | return -1; |
248 | 54936004 | bellard | } |
249 | a03e2d42 | bellard | /* Note: we prefer to control the mapping address. It is
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250 | a03e2d42 | bellard | especially important if qemu_host_page_size >
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251 | a03e2d42 | bellard | qemu_real_host_page_size */
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252 | a03e2d42 | bellard | p = mmap(g2h(mmap_start), |
253 | a03e2d42 | bellard | host_len, prot, flags | MAP_FIXED, fd, host_offset); |
254 | a03e2d42 | bellard | if (p == MAP_FAILED)
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255 | a03e2d42 | bellard | return -1; |
256 | a03e2d42 | bellard | /* update start so that it points to the file position at 'offset' */
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257 | a03e2d42 | bellard | host_start = (unsigned long)p; |
258 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS))
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259 | a03e2d42 | bellard | host_start += offset - host_offset; |
260 | a03e2d42 | bellard | start = h2g(host_start); |
261 | a03e2d42 | bellard | } else {
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262 | 7ab240ad | balrog | int flg;
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263 | 7ab240ad | balrog | target_ulong addr; |
264 | 7ab240ad | balrog | |
265 | a03e2d42 | bellard | if (start & ~TARGET_PAGE_MASK) {
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266 | e89f07d3 | pbrook | errno = EINVAL; |
267 | e89f07d3 | pbrook | return -1; |
268 | e89f07d3 | pbrook | } |
269 | a03e2d42 | bellard | end = start + len; |
270 | a03e2d42 | bellard | real_end = HOST_PAGE_ALIGN(end); |
271 | 7ab240ad | balrog | |
272 | 7ab240ad | balrog | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
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273 | 7ab240ad | balrog | flg = page_get_flags(addr); |
274 | 7ab240ad | balrog | if (flg & PAGE_RESERVED) {
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275 | 7ab240ad | balrog | errno = ENXIO; |
276 | 7ab240ad | balrog | return -1; |
277 | 7ab240ad | balrog | } |
278 | 7ab240ad | balrog | } |
279 | 7ab240ad | balrog | |
280 | a03e2d42 | bellard | /* worst case: we cannot map the file because the offset is not
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281 | a03e2d42 | bellard | aligned, so we read it */
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282 | a03e2d42 | bellard | if (!(flags & MAP_ANONYMOUS) &&
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283 | a03e2d42 | bellard | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
284 | a03e2d42 | bellard | /* msync() won't work here, so we return an error if write is
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285 | a03e2d42 | bellard | possible while it is a shared mapping */
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286 | a03e2d42 | bellard | if ((flags & MAP_TYPE) == MAP_SHARED &&
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287 | a03e2d42 | bellard | (prot & PROT_WRITE)) { |
288 | a03e2d42 | bellard | errno = EINVAL; |
289 | a03e2d42 | bellard | return -1; |
290 | a03e2d42 | bellard | } |
291 | a03e2d42 | bellard | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
292 | a03e2d42 | bellard | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
293 | a03e2d42 | bellard | -1, 0); |
294 | a03e2d42 | bellard | if (retaddr == -1) |
295 | a03e2d42 | bellard | return -1; |
296 | a03e2d42 | bellard | pread(fd, g2h(start), len, offset); |
297 | a03e2d42 | bellard | if (!(prot & PROT_WRITE)) {
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298 | a03e2d42 | bellard | ret = target_mprotect(start, len, prot); |
299 | a03e2d42 | bellard | if (ret != 0) |
300 | a03e2d42 | bellard | return ret;
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301 | a03e2d42 | bellard | } |
302 | a03e2d42 | bellard | goto the_end;
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303 | 54936004 | bellard | } |
304 | a03e2d42 | bellard | |
305 | a03e2d42 | bellard | /* handle the start of the mapping */
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306 | a03e2d42 | bellard | if (start > real_start) {
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307 | a03e2d42 | bellard | if (real_end == real_start + qemu_host_page_size) {
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308 | a03e2d42 | bellard | /* one single host page */
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309 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, end, |
310 | a03e2d42 | bellard | prot, flags, fd, offset); |
311 | a03e2d42 | bellard | if (ret == -1) |
312 | a03e2d42 | bellard | return ret;
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313 | a03e2d42 | bellard | goto the_end1;
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314 | a03e2d42 | bellard | } |
315 | a03e2d42 | bellard | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, |
316 | 54936004 | bellard | prot, flags, fd, offset); |
317 | 54936004 | bellard | if (ret == -1) |
318 | 54936004 | bellard | return ret;
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319 | a03e2d42 | bellard | real_start += qemu_host_page_size; |
320 | a03e2d42 | bellard | } |
321 | a03e2d42 | bellard | /* handle the end of the mapping */
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322 | a03e2d42 | bellard | if (end < real_end) {
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323 | a03e2d42 | bellard | ret = mmap_frag(real_end - qemu_host_page_size, |
324 | a03e2d42 | bellard | real_end - qemu_host_page_size, real_end, |
325 | a03e2d42 | bellard | prot, flags, fd, |
326 | a03e2d42 | bellard | offset + real_end - qemu_host_page_size - start); |
327 | a03e2d42 | bellard | if (ret == -1) |
328 | a03e2d42 | bellard | return -1; |
329 | a03e2d42 | bellard | real_end -= qemu_host_page_size; |
330 | 54936004 | bellard | } |
331 | 3b46e624 | ths | |
332 | a03e2d42 | bellard | /* map the middle (easier) */
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333 | a03e2d42 | bellard | if (real_start < real_end) {
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334 | a03e2d42 | bellard | void *p;
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335 | a03e2d42 | bellard | unsigned long offset1; |
336 | a03e2d42 | bellard | if (flags & MAP_ANONYMOUS)
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337 | a03e2d42 | bellard | offset1 = 0;
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338 | a03e2d42 | bellard | else
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339 | a03e2d42 | bellard | offset1 = offset + real_start - start; |
340 | a03e2d42 | bellard | p = mmap(g2h(real_start), real_end - real_start, |
341 | a03e2d42 | bellard | prot, flags, fd, offset1); |
342 | a03e2d42 | bellard | if (p == MAP_FAILED)
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343 | a03e2d42 | bellard | return -1; |
344 | a03e2d42 | bellard | } |
345 | 54936004 | bellard | } |
346 | 54936004 | bellard | the_end1:
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347 | 54936004 | bellard | page_set_flags(start, start + len, prot | PAGE_VALID); |
348 | 54936004 | bellard | the_end:
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349 | 54936004 | bellard | #ifdef DEBUG_MMAP
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350 | 2e0ded9c | edgar_igl | printf("ret=0x" TARGET_FMT_lx "\n", start); |
351 | 54936004 | bellard | page_dump(stdout); |
352 | 54936004 | bellard | printf("\n");
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353 | 54936004 | bellard | #endif
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354 | 54936004 | bellard | return start;
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355 | 54936004 | bellard | } |
356 | 54936004 | bellard | |
357 | 992f48a0 | blueswir1 | int target_munmap(abi_ulong start, abi_ulong len)
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358 | 54936004 | bellard | { |
359 | 992f48a0 | blueswir1 | abi_ulong end, real_start, real_end, addr; |
360 | 54936004 | bellard | int prot, ret;
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361 | 54936004 | bellard | |
362 | 54936004 | bellard | #ifdef DEBUG_MMAP
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363 | 54936004 | bellard | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
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364 | 54936004 | bellard | #endif
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365 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
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366 | 54936004 | bellard | return -EINVAL;
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367 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
368 | 54936004 | bellard | if (len == 0) |
369 | 54936004 | bellard | return -EINVAL;
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370 | 54936004 | bellard | end = start + len; |
371 | 53a5960a | pbrook | real_start = start & qemu_host_page_mask; |
372 | 53a5960a | pbrook | real_end = HOST_PAGE_ALIGN(end); |
373 | 54936004 | bellard | |
374 | 53a5960a | pbrook | if (start > real_start) {
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375 | 54936004 | bellard | /* handle host page containing start */
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376 | 54936004 | bellard | prot = 0;
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377 | 53a5960a | pbrook | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
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378 | 54936004 | bellard | prot |= page_get_flags(addr); |
379 | 54936004 | bellard | } |
380 | 53a5960a | pbrook | if (real_end == real_start + qemu_host_page_size) {
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381 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
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382 | d418c81e | bellard | prot |= page_get_flags(addr); |
383 | d418c81e | bellard | } |
384 | 53a5960a | pbrook | end = real_end; |
385 | d418c81e | bellard | } |
386 | 54936004 | bellard | if (prot != 0) |
387 | 53a5960a | pbrook | real_start += qemu_host_page_size; |
388 | 54936004 | bellard | } |
389 | 53a5960a | pbrook | if (end < real_end) {
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390 | 54936004 | bellard | prot = 0;
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391 | 53a5960a | pbrook | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
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392 | 54936004 | bellard | prot |= page_get_flags(addr); |
393 | 54936004 | bellard | } |
394 | 54936004 | bellard | if (prot != 0) |
395 | 53a5960a | pbrook | real_end -= qemu_host_page_size; |
396 | 54936004 | bellard | } |
397 | 3b46e624 | ths | |
398 | 54936004 | bellard | /* unmap what we can */
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399 | 53a5960a | pbrook | if (real_start < real_end) {
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400 | 4118a970 | j_mayer | ret = munmap(g2h(real_start), real_end - real_start); |
401 | 54936004 | bellard | if (ret != 0) |
402 | 54936004 | bellard | return ret;
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403 | 54936004 | bellard | } |
404 | 54936004 | bellard | |
405 | 54936004 | bellard | page_set_flags(start, start + len, 0);
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406 | 54936004 | bellard | return 0; |
407 | 54936004 | bellard | } |
408 | 54936004 | bellard | |
409 | 54936004 | bellard | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
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410 | 54936004 | bellard | blocks which have been allocated starting on a host page */
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411 | 992f48a0 | blueswir1 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
412 | 992f48a0 | blueswir1 | abi_ulong new_size, unsigned long flags, |
413 | 992f48a0 | blueswir1 | abi_ulong new_addr) |
414 | 54936004 | bellard | { |
415 | 54936004 | bellard | int prot;
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416 | a5b85f79 | ths | unsigned long host_addr; |
417 | 54936004 | bellard | |
418 | 54936004 | bellard | /* XXX: use 5 args syscall */
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419 | a5b85f79 | ths | host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
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420 | a5b85f79 | ths | if (host_addr == -1) |
421 | a5b85f79 | ths | return -1; |
422 | a5b85f79 | ths | new_addr = h2g(host_addr); |
423 | 54936004 | bellard | prot = page_get_flags(old_addr); |
424 | 54936004 | bellard | page_set_flags(old_addr, old_addr + old_size, 0);
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425 | 54936004 | bellard | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
426 | 54936004 | bellard | return new_addr;
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427 | 54936004 | bellard | } |
428 | 54936004 | bellard | |
429 | 992f48a0 | blueswir1 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
430 | 54936004 | bellard | { |
431 | 992f48a0 | blueswir1 | abi_ulong end; |
432 | 54936004 | bellard | |
433 | 54936004 | bellard | if (start & ~TARGET_PAGE_MASK)
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434 | 54936004 | bellard | return -EINVAL;
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435 | 54936004 | bellard | len = TARGET_PAGE_ALIGN(len); |
436 | 54936004 | bellard | end = start + len; |
437 | d418c81e | bellard | if (end < start)
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438 | d418c81e | bellard | return -EINVAL;
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439 | d418c81e | bellard | if (end == start)
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440 | d418c81e | bellard | return 0; |
441 | 3b46e624 | ths | |
442 | 83fb7adf | bellard | start &= qemu_host_page_mask; |
443 | 53a5960a | pbrook | return msync(g2h(start), end - start, flags);
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444 | 54936004 | bellard | } |