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