lib/efi_loader/efi_image_loader.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  *  EFI image loader
  *
  *  based partly on wine code
  *
  *  Copyright (c) 2016 Alexander Graf
  */

 #include <common.h>
 #include <efi_loader.h>
 #include <pe.h>

 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(__aarch64__)
 	IMAGE_FILE_MACHINE_ARM64,
 #elif defined(__arm__)
 	IMAGE_FILE_MACHINE_ARM,
 	IMAGE_FILE_MACHINE_THUMB,
 	IMAGE_FILE_MACHINE_ARMNT,
 #endif

 #if defined(__x86_64__)
 	IMAGE_FILE_MACHINE_AMD64,
 #elif defined(__i386__)
 	IMAGE_FILE_MACHINE_I386,
 #endif

 #if defined(__riscv) && (__riscv_xlen == 32)
 	IMAGE_FILE_MACHINE_RISCV32,
 #endif

 #if defined(__riscv) && (__riscv_xlen == 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,
 			unsigned long pref_address)
 {
 	unsigned long delta = (unsigned long)efi_reloc - pref_address;
 	const IMAGE_BASE_RELOCATION *end;
 	int i;

 	if (delta == 0)
 		return EFI_SUCCESS;

 	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;
 			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;
 #ifdef __riscv
 			case IMAGE_REL_BASED_RISCV_HI20:
 				*x32 = ((*x32 & 0xfffff000) + (uint32_t)delta) |
 					(*x32 & 0x00000fff);
 				break;
 			case IMAGE_REL_BASED_RISCV_LOW12I:
 			case IMAGE_REL_BASED_RISCV_LOW12S:
 				/* We know that we're 4k aligned */
 				if (delta & 0xfff) {
 					printf("Unsupported reloc offset\n");
 					return EFI_LOAD_ERROR;
 				}
 				break;
 #endif
 			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_base;
 	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 = &sections[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_base = opt->ImageBase;
 		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_base = opt->ImageBase;
 		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 = &sections[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,
 				(unsigned long)image_base) != 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, EFI_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;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* EFI image loader
	*
	* based partly on wine code
	*
	* Copyright (c) 2016 Alexander Graf
	*/

	#include <common.h>
	#include <efi_loader.h>
	#include <pe.h>

	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(__aarch64__)
	IMAGE_FILE_MACHINE_ARM64,
	#elif defined(__arm__)
	IMAGE_FILE_MACHINE_ARM,
	IMAGE_FILE_MACHINE_THUMB,
	IMAGE_FILE_MACHINE_ARMNT,
	#endif

	#if defined(__x86_64__)
	IMAGE_FILE_MACHINE_AMD64,
	#elif defined(__i386__)
	IMAGE_FILE_MACHINE_I386,
	#endif

	#if defined(__riscv) && (__riscv_xlen == 32)
	IMAGE_FILE_MACHINE_RISCV32,
	#endif

	#if defined(__riscv) && (__riscv_xlen == 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,
	unsigned long pref_address)
	{
	unsigned long delta = (unsigned long)efi_reloc - pref_address;
	const IMAGE_BASE_RELOCATION *end;
	int i;

	if (delta == 0)
	return EFI_SUCCESS;

	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;
	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;
	#ifdef __riscv
	case IMAGE_REL_BASED_RISCV_HI20:
	x32 = ((x32 & 0xfffff000) + (uint32_t)delta) \|
	(*x32 & 0x00000fff);
	break;
	case IMAGE_REL_BASED_RISCV_LOW12I:
	case IMAGE_REL_BASED_RISCV_LOW12S:
	/* We know that we're 4k aligned */
	if (delta & 0xfff) {
	printf("Unsupported reloc offset\n");
	return EFI_LOAD_ERROR;
	}
	break;
	#endif
	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_base;
	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 = &sections[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_base = opt->ImageBase;
	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_base = opt->ImageBase;
	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 = &sections[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,
	(unsigned long)image_base) != 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, EFI_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;
	}