| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (memmap.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdint.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <memmap.h> |
| 26 | |
| 27 | #ifndef PROT_READ |
| 28 | #define PROT_READ 0x1 /* Page can be read */ |
| 29 | #endif |
| 30 | |
| 31 | #ifndef PROT_WRITE |
| 32 | #define PROT_WRITE 0x2 /* Page can be written. */ |
| 33 | #endif |
| 34 | |
| 35 | #ifndef PROT_READWRITE |
| 36 | #define PROT_READWRITE 0x3 /* Page can be written to and read from. */ |
| 37 | #endif |
| 38 | |
| 39 | #ifndef PROT_EXEC |
| 40 | #define PROT_EXEC 0x4 /* Page can be executed. */ |
| 41 | #endif |
| 42 | |
| 43 | #ifndef PROT_NONE |
| 44 | #define PROT_NONE 0x0 /* Page can not be accessed. */ |
| 45 | #endif |
| 46 | |
| 47 | #ifndef MAP_FAILED |
| 48 | #define MAP_FAILED ((void *) -1) |
| 49 | #endif |
| 50 | |
| 51 | #ifdef _WIN32 |
| 52 | void* mmap(void *addr, size_t len, int prot, int flags, |
| 53 | int fildes, size_t offset) |
| 54 | { |
| 55 | void *map = (void*)NULL; |
| 56 | HANDLE handle = INVALID_HANDLE_VALUE; |
| 57 | |
| 58 | switch (prot) |
| 59 | { |
| 60 | case PROT_READ: |
| 61 | default: |
| 62 | handle = CreateFileMapping((HANDLE) |
| 63 | _get_osfhandle(fildes), 0, PAGE_READONLY, 0, |
| 64 | len, 0); |
| 65 | if (!handle) |
| 66 | break; |
| 67 | map = (void*)MapViewOfFile(handle, FILE_MAP_READ, 0, 0, len); |
| 68 | CloseHandle(handle); |
| 69 | break; |
| 70 | case PROT_WRITE: |
| 71 | handle = CreateFileMapping((HANDLE) |
| 72 | _get_osfhandle(fildes),0,PAGE_READWRITE,0, |
| 73 | len, 0); |
| 74 | if (!handle) |
| 75 | break; |
| 76 | map = (void*)MapViewOfFile(handle, FILE_MAP_WRITE, 0, 0, len); |
| 77 | CloseHandle(handle); |
| 78 | break; |
| 79 | case PROT_READWRITE: |
| 80 | handle = CreateFileMapping((HANDLE) |
| 81 | _get_osfhandle(fildes),0,PAGE_READWRITE,0, |
| 82 | len, 0); |
| 83 | if (!handle) |
| 84 | break; |
| 85 | map = (void*)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, len); |
| 86 | CloseHandle(handle); |
| 87 | break; |
| 88 | } |
| 89 | |
| 90 | if (map == (void*)NULL) |
| 91 | return((void*)MAP_FAILED); |
| 92 | return((void*) ((int8_t*)map + offset)); |
| 93 | } |
| 94 | |
| 95 | int munmap(void *addr, size_t length) |
| 96 | { |
| 97 | if (!UnmapViewOfFile(addr)) |
| 98 | return -1; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | int mprotect(void *addr, size_t len, int prot) |
| 103 | { |
| 104 | /* Incomplete, just assumes PAGE_EXECUTE_READWRITE right now |
| 105 | * instead of correctly handling prot */ |
| 106 | prot = 0; |
| 107 | if (prot & (PROT_READ | PROT_WRITE | PROT_EXEC)) |
| 108 | prot = PAGE_EXECUTE_READWRITE; |
| 109 | return VirtualProtect(addr, len, prot, 0); |
| 110 | } |
| 111 | |
| 112 | #elif !defined(HAVE_MMAN) |
| 113 | void* mmap(void *addr, size_t len, int prot, int flags, |
| 114 | int fildes, size_t offset) |
| 115 | { |
| 116 | return malloc(len); |
| 117 | } |
| 118 | |
| 119 | int munmap(void *addr, size_t len) |
| 120 | { |
| 121 | free(addr); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | int mprotect(void *addr, size_t len, int prot) |
| 126 | { |
| 127 | /* stub - not really needed at this point |
| 128 | * since this codepath has no dynarecs. */ |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | #endif |
| 133 | |
| 134 | #if defined(__MACH__) && defined(__arm__) |
| 135 | #include <libkern/OSCacheControl.h> |
| 136 | #endif |
| 137 | |
| 138 | int memsync(void *start, void *end) |
| 139 | { |
| 140 | size_t len = (char*)end - (char*)start; |
| 141 | #if defined(__MACH__) && defined(__arm__) |
| 142 | sys_dcache_flush(start ,len); |
| 143 | sys_icache_invalidate(start, len); |
| 144 | return 0; |
| 145 | #elif defined(__arm__) && !defined(__QNX__) |
| 146 | (void)len; |
| 147 | __clear_cache(start, end); |
| 148 | return 0; |
| 149 | #elif defined(HAVE_MMAN) |
| 150 | return msync(start, len, MS_SYNC | MS_INVALIDATE |
| 151 | #ifdef __QNX__ |
| 152 | MS_CACHE_ONLY |
| 153 | #endif |
| 154 | ); |
| 155 | #else |
| 156 | (void)len; |
| 157 | return 0; |
| 158 | #endif |
| 159 | } |
| 160 | |
| 161 | int memprotect(void *addr, size_t len) |
| 162 | { |
| 163 | return mprotect(addr, len, PROT_READ | PROT_WRITE | PROT_EXEC); |
| 164 | } |