// SPDX-License-Identifier: GPL-2.0+ /* * EFI image loader * * based partly on wine code * * Copyright (c) 2016 Alexander Graf */ #include #include #include #include const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID; const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID; const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID; const efi_guid_t efi_simple_file_system_protocol_guid = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID; const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID; static int machines[] = { #if defined(CONFIG_ARM64) IMAGE_FILE_MACHINE_ARM64, #elif defined(CONFIG_ARM) IMAGE_FILE_MACHINE_ARM, IMAGE_FILE_MACHINE_THUMB, IMAGE_FILE_MACHINE_ARMNT, #endif #if defined(CONFIG_X86_64) IMAGE_FILE_MACHINE_AMD64, #elif defined(CONFIG_X86) IMAGE_FILE_MACHINE_I386, #endif #if defined(CONFIG_CPU_RISCV_32) IMAGE_FILE_MACHINE_RISCV32, #endif #if defined(CONFIG_CPU_RISCV_64) IMAGE_FILE_MACHINE_RISCV64, #endif 0 }; /* * Print information about a loaded image. * * If the program counter is located within the image the offset to the base * address is shown. * * @image: loaded image * @pc: program counter (use NULL to suppress offset output) * @return: status code */ efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc) { if (!image) return EFI_INVALID_PARAMETER; printf("UEFI image"); printf(" [0x%p:0x%p]", image->reloc_base, image->reloc_base + image->reloc_size - 1); if (pc && pc >= image->reloc_base && pc < image->reloc_base + image->reloc_size) printf(" pc=0x%zx", pc - image->reloc_base); if (image->file_path) printf(" '%pD'", image->file_path); printf("\n"); return EFI_SUCCESS; } /* * Print information about all loaded images. * * @pc: program counter (use NULL to suppress offset output) */ void efi_print_image_infos(void *pc) { struct efi_object *efiobj; struct efi_handler *handler; list_for_each_entry(efiobj, &efi_obj_list, link) { list_for_each_entry(handler, &efiobj->protocols, link) { if (!guidcmp(handler->guid, &efi_guid_loaded_image)) { efi_print_image_info( handler->protocol_interface, pc); } } } } static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel, unsigned long rel_size, void *efi_reloc) { const IMAGE_BASE_RELOCATION *end; int i; end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size); while (rel < end - 1 && rel->SizeOfBlock) { const uint16_t *relocs = (const uint16_t *)(rel + 1); i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t); while (i--) { uint32_t offset = (uint32_t)(*relocs & 0xfff) + rel->VirtualAddress; int type = *relocs >> EFI_PAGE_SHIFT; unsigned long delta = (unsigned long)efi_reloc; uint64_t *x64 = efi_reloc + offset; uint32_t *x32 = efi_reloc + offset; uint16_t *x16 = efi_reloc + offset; switch (type) { case IMAGE_REL_BASED_ABSOLUTE: break; case IMAGE_REL_BASED_HIGH: *x16 += ((uint32_t)delta) >> 16; break; case IMAGE_REL_BASED_LOW: *x16 += (uint16_t)delta; break; case IMAGE_REL_BASED_HIGHLOW: *x32 += (uint32_t)delta; break; case IMAGE_REL_BASED_DIR64: *x64 += (uint64_t)delta; break; default: printf("Unknown Relocation off %x type %x\n", offset, type); return EFI_LOAD_ERROR; } relocs++; } rel = (const IMAGE_BASE_RELOCATION *)relocs; } return EFI_SUCCESS; } void __weak invalidate_icache_all(void) { /* If the system doesn't support icache_all flush, cross our fingers */ } /* * Determine the memory types to be used for code and data. * * @loaded_image_info image descriptor * @image_type field Subsystem of the optional header for * Windows specific field */ static void efi_set_code_and_data_type( struct efi_loaded_image *loaded_image_info, uint16_t image_type) { switch (image_type) { case IMAGE_SUBSYSTEM_EFI_APPLICATION: loaded_image_info->image_code_type = EFI_LOADER_CODE; loaded_image_info->image_data_type = EFI_LOADER_DATA; break; case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER: loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE; loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA; break; case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER: case IMAGE_SUBSYSTEM_EFI_ROM: loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE; loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA; break; default: printf("%s: invalid image type: %u\n", __func__, image_type); /* Let's assume it is an application */ loaded_image_info->image_code_type = EFI_LOADER_CODE; loaded_image_info->image_data_type = EFI_LOADER_DATA; break; } } /* * This function loads all sections from a PE binary into a newly reserved * piece of memory. On successful load it then returns the entry point for * the binary. Otherwise NULL. */ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info) { IMAGE_NT_HEADERS32 *nt; IMAGE_DOS_HEADER *dos; IMAGE_SECTION_HEADER *sections; int num_sections; void *efi_reloc; int i; const IMAGE_BASE_RELOCATION *rel; unsigned long rel_size; int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC; void *entry; uint64_t image_size; unsigned long virt_size = 0; int supported = 0; dos = efi; if (dos->e_magic != IMAGE_DOS_SIGNATURE) { printf("%s: Invalid DOS Signature\n", __func__); return NULL; } nt = (void *) ((char *)efi + dos->e_lfanew); if (nt->Signature != IMAGE_NT_SIGNATURE) { printf("%s: Invalid NT Signature\n", __func__); return NULL; } for (i = 0; machines[i]; i++) if (machines[i] == nt->FileHeader.Machine) { supported = 1; break; } if (!supported) { printf("%s: Machine type 0x%04x is not supported\n", __func__, nt->FileHeader.Machine); return NULL; } /* Calculate upper virtual address boundary */ num_sections = nt->FileHeader.NumberOfSections; sections = (void *)&nt->OptionalHeader + nt->FileHeader.SizeOfOptionalHeader; for (i = num_sections - 1; i >= 0; i--) { IMAGE_SECTION_HEADER *sec = §ions[i]; virt_size = max_t(unsigned long, virt_size, sec->VirtualAddress + sec->Misc.VirtualSize); } /* Read 32/64bit specific header bits */ if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) { IMAGE_NT_HEADERS64 *nt64 = (void *)nt; IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader; image_size = opt->SizeOfImage; efi_set_code_and_data_type(loaded_image_info, opt->Subsystem); efi_reloc = efi_alloc(virt_size, loaded_image_info->image_code_type); if (!efi_reloc) { printf("%s: Could not allocate %lu bytes\n", __func__, virt_size); return NULL; } entry = efi_reloc + opt->AddressOfEntryPoint; rel_size = opt->DataDirectory[rel_idx].Size; rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; virt_size = ALIGN(virt_size, opt->SectionAlignment); } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) { IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader; image_size = opt->SizeOfImage; efi_set_code_and_data_type(loaded_image_info, opt->Subsystem); efi_reloc = efi_alloc(virt_size, loaded_image_info->image_code_type); if (!efi_reloc) { printf("%s: Could not allocate %lu bytes\n", __func__, virt_size); return NULL; } entry = efi_reloc + opt->AddressOfEntryPoint; rel_size = opt->DataDirectory[rel_idx].Size; rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; virt_size = ALIGN(virt_size, opt->SectionAlignment); } else { printf("%s: Invalid optional header magic %x\n", __func__, nt->OptionalHeader.Magic); return NULL; } /* Load sections into RAM */ for (i = num_sections - 1; i >= 0; i--) { IMAGE_SECTION_HEADER *sec = §ions[i]; memset(efi_reloc + sec->VirtualAddress, 0, sec->Misc.VirtualSize); memcpy(efi_reloc + sec->VirtualAddress, efi + sec->PointerToRawData, sec->SizeOfRawData); } /* Run through relocations */ if (efi_loader_relocate(rel, rel_size, efi_reloc) != EFI_SUCCESS) { efi_free_pages((uintptr_t) efi_reloc, (virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT); return NULL; } /* Flush cache */ flush_cache((ulong)efi_reloc, ALIGN(virt_size, CONFIG_SYS_CACHELINE_SIZE)); invalidate_icache_all(); /* Populate the loaded image interface bits */ loaded_image_info->image_base = efi; loaded_image_info->image_size = image_size; loaded_image_info->reloc_base = efi_reloc; loaded_image_info->reloc_size = virt_size; return entry; }