lib/efi_loader/efi_image_loader.c

   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 = &sections[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 = &sections[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, EFI_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 }