1 /* 2 * EFI image loader 3 * 4 * based partly on wine code 5 * 6 * Copyright (c) 2016 Alexander Graf 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <efi_loader.h> 13 #include <pe.h> 14 #include <asm/global_data.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 18 const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID; 19 const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID; 20 const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID; 21 const efi_guid_t efi_simple_file_system_protocol_guid = 22 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID; 23 const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID; 24 25 static int machines[] = { 26 #if defined(CONFIG_ARM64) 27 IMAGE_FILE_MACHINE_ARM64, 28 #elif defined(CONFIG_ARM) 29 IMAGE_FILE_MACHINE_ARM, 30 IMAGE_FILE_MACHINE_THUMB, 31 IMAGE_FILE_MACHINE_ARMNT, 32 #endif 33 34 #if defined(CONFIG_X86_64) 35 IMAGE_FILE_MACHINE_AMD64, 36 #elif defined(CONFIG_X86) 37 IMAGE_FILE_MACHINE_I386, 38 #endif 39 40 #if defined(CONFIG_CPU_RISCV_32) 41 IMAGE_FILE_MACHINE_RISCV32, 42 #endif 43 44 #if defined(CONFIG_CPU_RISCV_64) 45 IMAGE_FILE_MACHINE_RISCV64, 46 #endif 47 0 }; 48 49 /* 50 * Print information about a loaded image. 51 * 52 * If the program counter is located within the image the offset to the base 53 * address is shown. 54 * 55 * @image: loaded image 56 * @pc: program counter (use NULL to suppress offset output) 57 * @return: status code 58 */ 59 efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc) 60 { 61 if (!image) 62 return EFI_INVALID_PARAMETER; 63 printf("UEFI image"); 64 printf(" [0x%p:0x%p]", 65 image->reloc_base, image->reloc_base + image->reloc_size - 1); 66 if (pc && pc >= image->reloc_base && 67 pc < image->reloc_base + image->reloc_size) 68 printf(" pc=0x%zx", pc - image->reloc_base); 69 if (image->file_path) 70 printf(" '%pD'", image->file_path); 71 printf("\n"); 72 return EFI_SUCCESS; 73 } 74 75 /* 76 * Print information about all loaded images. 77 * 78 * @pc: program counter (use NULL to suppress offset output) 79 */ 80 void efi_print_image_infos(void *pc) 81 { 82 struct efi_object *efiobj; 83 struct efi_handler *handler; 84 85 list_for_each_entry(efiobj, &efi_obj_list, link) { 86 list_for_each_entry(handler, &efiobj->protocols, link) { 87 if (!guidcmp(handler->guid, &efi_guid_loaded_image)) { 88 efi_print_image_info( 89 handler->protocol_interface, pc); 90 } 91 } 92 } 93 } 94 95 static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel, 96 unsigned long rel_size, void *efi_reloc) 97 { 98 const IMAGE_BASE_RELOCATION *end; 99 int i; 100 101 end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size); 102 while (rel < end - 1 && rel->SizeOfBlock) { 103 const uint16_t *relocs = (const uint16_t *)(rel + 1); 104 i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t); 105 while (i--) { 106 uint32_t offset = (uint32_t)(*relocs & 0xfff) + 107 rel->VirtualAddress; 108 int type = *relocs >> EFI_PAGE_SHIFT; 109 unsigned long delta = (unsigned long)efi_reloc; 110 uint64_t *x64 = efi_reloc + offset; 111 uint32_t *x32 = efi_reloc + offset; 112 uint16_t *x16 = efi_reloc + offset; 113 114 switch (type) { 115 case IMAGE_REL_BASED_ABSOLUTE: 116 break; 117 case IMAGE_REL_BASED_HIGH: 118 *x16 += ((uint32_t)delta) >> 16; 119 break; 120 case IMAGE_REL_BASED_LOW: 121 *x16 += (uint16_t)delta; 122 break; 123 case IMAGE_REL_BASED_HIGHLOW: 124 *x32 += (uint32_t)delta; 125 break; 126 case IMAGE_REL_BASED_DIR64: 127 *x64 += (uint64_t)delta; 128 break; 129 default: 130 printf("Unknown Relocation off %x type %x\n", 131 offset, type); 132 return EFI_LOAD_ERROR; 133 } 134 relocs++; 135 } 136 rel = (const IMAGE_BASE_RELOCATION *)relocs; 137 } 138 return EFI_SUCCESS; 139 } 140 141 void __weak invalidate_icache_all(void) 142 { 143 /* If the system doesn't support icache_all flush, cross our fingers */ 144 } 145 146 /* 147 * Determine the memory types to be used for code and data. 148 * 149 * @loaded_image_info image descriptor 150 * @image_type field Subsystem of the optional header for 151 * Windows specific field 152 */ 153 static void efi_set_code_and_data_type( 154 struct efi_loaded_image *loaded_image_info, 155 uint16_t image_type) 156 { 157 switch (image_type) { 158 case IMAGE_SUBSYSTEM_EFI_APPLICATION: 159 loaded_image_info->image_code_type = EFI_LOADER_CODE; 160 loaded_image_info->image_data_type = EFI_LOADER_DATA; 161 break; 162 case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER: 163 loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE; 164 loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA; 165 break; 166 case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER: 167 case IMAGE_SUBSYSTEM_EFI_ROM: 168 loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE; 169 loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA; 170 break; 171 default: 172 printf("%s: invalid image type: %u\n", __func__, image_type); 173 /* Let's assume it is an application */ 174 loaded_image_info->image_code_type = EFI_LOADER_CODE; 175 loaded_image_info->image_data_type = EFI_LOADER_DATA; 176 break; 177 } 178 } 179 180 /* 181 * This function loads all sections from a PE binary into a newly reserved 182 * piece of memory. On successful load it then returns the entry point for 183 * the binary. Otherwise NULL. 184 */ 185 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info) 186 { 187 IMAGE_NT_HEADERS32 *nt; 188 IMAGE_DOS_HEADER *dos; 189 IMAGE_SECTION_HEADER *sections; 190 int num_sections; 191 void *efi_reloc; 192 int i; 193 const IMAGE_BASE_RELOCATION *rel; 194 unsigned long rel_size; 195 int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC; 196 void *entry; 197 uint64_t image_size; 198 unsigned long virt_size = 0; 199 int supported = 0; 200 201 dos = efi; 202 if (dos->e_magic != IMAGE_DOS_SIGNATURE) { 203 printf("%s: Invalid DOS Signature\n", __func__); 204 return NULL; 205 } 206 207 nt = (void *) ((char *)efi + dos->e_lfanew); 208 if (nt->Signature != IMAGE_NT_SIGNATURE) { 209 printf("%s: Invalid NT Signature\n", __func__); 210 return NULL; 211 } 212 213 for (i = 0; machines[i]; i++) 214 if (machines[i] == nt->FileHeader.Machine) { 215 supported = 1; 216 break; 217 } 218 219 if (!supported) { 220 printf("%s: Machine type 0x%04x is not supported\n", 221 __func__, nt->FileHeader.Machine); 222 return NULL; 223 } 224 225 /* Calculate upper virtual address boundary */ 226 num_sections = nt->FileHeader.NumberOfSections; 227 sections = (void *)&nt->OptionalHeader + 228 nt->FileHeader.SizeOfOptionalHeader; 229 230 for (i = num_sections - 1; i >= 0; i--) { 231 IMAGE_SECTION_HEADER *sec = §ions[i]; 232 virt_size = max_t(unsigned long, virt_size, 233 sec->VirtualAddress + sec->Misc.VirtualSize); 234 } 235 236 /* Read 32/64bit specific header bits */ 237 if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) { 238 IMAGE_NT_HEADERS64 *nt64 = (void *)nt; 239 IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader; 240 image_size = opt->SizeOfImage; 241 efi_set_code_and_data_type(loaded_image_info, opt->Subsystem); 242 efi_reloc = efi_alloc(virt_size, 243 loaded_image_info->image_code_type); 244 if (!efi_reloc) { 245 printf("%s: Could not allocate %lu bytes\n", 246 __func__, virt_size); 247 return NULL; 248 } 249 entry = efi_reloc + opt->AddressOfEntryPoint; 250 rel_size = opt->DataDirectory[rel_idx].Size; 251 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; 252 virt_size = ALIGN(virt_size, opt->SectionAlignment); 253 } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) { 254 IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader; 255 image_size = opt->SizeOfImage; 256 efi_set_code_and_data_type(loaded_image_info, opt->Subsystem); 257 efi_reloc = efi_alloc(virt_size, 258 loaded_image_info->image_code_type); 259 if (!efi_reloc) { 260 printf("%s: Could not allocate %lu bytes\n", 261 __func__, virt_size); 262 return NULL; 263 } 264 entry = efi_reloc + opt->AddressOfEntryPoint; 265 rel_size = opt->DataDirectory[rel_idx].Size; 266 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; 267 virt_size = ALIGN(virt_size, opt->SectionAlignment); 268 } else { 269 printf("%s: Invalid optional header magic %x\n", __func__, 270 nt->OptionalHeader.Magic); 271 return NULL; 272 } 273 274 /* Load sections into RAM */ 275 for (i = num_sections - 1; i >= 0; i--) { 276 IMAGE_SECTION_HEADER *sec = §ions[i]; 277 memset(efi_reloc + sec->VirtualAddress, 0, 278 sec->Misc.VirtualSize); 279 memcpy(efi_reloc + sec->VirtualAddress, 280 efi + sec->PointerToRawData, 281 sec->SizeOfRawData); 282 } 283 284 /* Run through relocations */ 285 if (efi_loader_relocate(rel, rel_size, efi_reloc) != EFI_SUCCESS) { 286 efi_free_pages((uintptr_t) efi_reloc, 287 (virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT); 288 return NULL; 289 } 290 291 /* Flush cache */ 292 flush_cache((ulong)efi_reloc, 293 ALIGN(virt_size, CONFIG_SYS_CACHELINE_SIZE)); 294 invalidate_icache_all(); 295 296 /* Populate the loaded image interface bits */ 297 loaded_image_info->image_base = efi; 298 loaded_image_info->image_size = image_size; 299 loaded_image_info->reloc_base = efi_reloc; 300 loaded_image_info->reloc_size = virt_size; 301 302 return entry; 303 } 304