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https://github.com/brain-hackers/u-boot-brain
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![Alexander Graf](/assets/img/avatar_default.png)
The EFI image loader tries to determine which target architecture we're working with to only load PE binaries that match. So far this has worked based on CONFIG defines, because the target CPU was always indicated by a config define. With sandbox however, this is not longer true as all sandbox targets only encompass a single CONFIG option and so we need to use compiler defines to determine the CPU architecture. Signed-off-by: Alexander Graf <agraf@suse.de>
322 lines
9.0 KiB
C
322 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI image loader
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*
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* based partly on wine code
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#include <common.h>
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#include <efi_loader.h>
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#include <pe.h>
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const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
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const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID;
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const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID;
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const efi_guid_t efi_simple_file_system_protocol_guid =
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
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const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
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static int machines[] = {
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#if defined(__aarch64__)
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IMAGE_FILE_MACHINE_ARM64,
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#elif defined(__arm__)
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IMAGE_FILE_MACHINE_ARM,
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IMAGE_FILE_MACHINE_THUMB,
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IMAGE_FILE_MACHINE_ARMNT,
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#endif
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#if defined(__x86_64__)
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IMAGE_FILE_MACHINE_AMD64,
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#elif defined(__i386__)
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IMAGE_FILE_MACHINE_I386,
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#endif
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#if defined(__riscv) && (__riscv_xlen == 32)
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IMAGE_FILE_MACHINE_RISCV32,
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#endif
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#if defined(__riscv) && (__riscv_xlen == 64)
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IMAGE_FILE_MACHINE_RISCV64,
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#endif
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0 };
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/*
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* Print information about a loaded image.
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*
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* If the program counter is located within the image the offset to the base
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* address is shown.
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*
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* @image: loaded image
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* @pc: program counter (use NULL to suppress offset output)
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* @return: status code
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*/
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efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc)
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{
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if (!image)
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return EFI_INVALID_PARAMETER;
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printf("UEFI image");
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printf(" [0x%p:0x%p]",
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image->reloc_base, image->reloc_base + image->reloc_size - 1);
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if (pc && pc >= image->reloc_base &&
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pc < image->reloc_base + image->reloc_size)
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printf(" pc=0x%zx", pc - image->reloc_base);
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if (image->file_path)
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printf(" '%pD'", image->file_path);
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printf("\n");
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return EFI_SUCCESS;
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}
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/*
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* Print information about all loaded images.
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*
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* @pc: program counter (use NULL to suppress offset output)
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*/
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void efi_print_image_infos(void *pc)
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{
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struct efi_object *efiobj;
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struct efi_handler *handler;
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list_for_each_entry(efiobj, &efi_obj_list, link) {
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list_for_each_entry(handler, &efiobj->protocols, link) {
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if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
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efi_print_image_info(
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handler->protocol_interface, pc);
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}
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}
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}
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}
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static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
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unsigned long rel_size, void *efi_reloc,
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unsigned long pref_address)
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{
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unsigned long delta = (unsigned long)efi_reloc - pref_address;
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const IMAGE_BASE_RELOCATION *end;
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int i;
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if (delta == 0)
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return EFI_SUCCESS;
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end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
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while (rel < end - 1 && rel->SizeOfBlock) {
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const uint16_t *relocs = (const uint16_t *)(rel + 1);
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i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
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while (i--) {
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uint32_t offset = (uint32_t)(*relocs & 0xfff) +
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rel->VirtualAddress;
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int type = *relocs >> EFI_PAGE_SHIFT;
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uint64_t *x64 = efi_reloc + offset;
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uint32_t *x32 = efi_reloc + offset;
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uint16_t *x16 = efi_reloc + offset;
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switch (type) {
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case IMAGE_REL_BASED_ABSOLUTE:
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break;
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case IMAGE_REL_BASED_HIGH:
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*x16 += ((uint32_t)delta) >> 16;
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break;
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case IMAGE_REL_BASED_LOW:
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*x16 += (uint16_t)delta;
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break;
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case IMAGE_REL_BASED_HIGHLOW:
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*x32 += (uint32_t)delta;
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break;
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case IMAGE_REL_BASED_DIR64:
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*x64 += (uint64_t)delta;
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break;
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#ifdef __riscv
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case IMAGE_REL_BASED_RISCV_HI20:
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*x32 = ((*x32 & 0xfffff000) + (uint32_t)delta) |
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(*x32 & 0x00000fff);
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break;
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case IMAGE_REL_BASED_RISCV_LOW12I:
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case IMAGE_REL_BASED_RISCV_LOW12S:
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/* We know that we're 4k aligned */
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if (delta & 0xfff) {
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printf("Unsupported reloc offset\n");
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return EFI_LOAD_ERROR;
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}
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break;
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#endif
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default:
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printf("Unknown Relocation off %x type %x\n",
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offset, type);
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return EFI_LOAD_ERROR;
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}
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relocs++;
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}
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rel = (const IMAGE_BASE_RELOCATION *)relocs;
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}
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return EFI_SUCCESS;
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}
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void __weak invalidate_icache_all(void)
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{
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/* If the system doesn't support icache_all flush, cross our fingers */
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}
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/*
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* Determine the memory types to be used for code and data.
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*
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* @loaded_image_info image descriptor
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* @image_type field Subsystem of the optional header for
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* Windows specific field
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*/
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static void efi_set_code_and_data_type(
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struct efi_loaded_image *loaded_image_info,
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uint16_t image_type)
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{
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switch (image_type) {
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case IMAGE_SUBSYSTEM_EFI_APPLICATION:
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loaded_image_info->image_code_type = EFI_LOADER_CODE;
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loaded_image_info->image_data_type = EFI_LOADER_DATA;
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break;
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case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
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loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE;
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loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
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break;
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case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
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case IMAGE_SUBSYSTEM_EFI_ROM:
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loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
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loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
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break;
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default:
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printf("%s: invalid image type: %u\n", __func__, image_type);
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/* Let's assume it is an application */
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loaded_image_info->image_code_type = EFI_LOADER_CODE;
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loaded_image_info->image_data_type = EFI_LOADER_DATA;
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break;
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}
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}
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/*
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* This function loads all sections from a PE binary into a newly reserved
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* piece of memory. On successful load it then returns the entry point for
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* the binary. Otherwise NULL.
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*/
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void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
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{
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IMAGE_NT_HEADERS32 *nt;
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IMAGE_DOS_HEADER *dos;
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IMAGE_SECTION_HEADER *sections;
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int num_sections;
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void *efi_reloc;
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int i;
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const IMAGE_BASE_RELOCATION *rel;
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unsigned long rel_size;
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int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC;
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void *entry;
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uint64_t image_base;
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uint64_t image_size;
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unsigned long virt_size = 0;
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int supported = 0;
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dos = efi;
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if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
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printf("%s: Invalid DOS Signature\n", __func__);
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return NULL;
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}
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nt = (void *) ((char *)efi + dos->e_lfanew);
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if (nt->Signature != IMAGE_NT_SIGNATURE) {
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printf("%s: Invalid NT Signature\n", __func__);
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return NULL;
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}
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for (i = 0; machines[i]; i++)
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if (machines[i] == nt->FileHeader.Machine) {
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supported = 1;
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break;
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}
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if (!supported) {
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printf("%s: Machine type 0x%04x is not supported\n",
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__func__, nt->FileHeader.Machine);
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return NULL;
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}
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/* Calculate upper virtual address boundary */
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num_sections = nt->FileHeader.NumberOfSections;
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sections = (void *)&nt->OptionalHeader +
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nt->FileHeader.SizeOfOptionalHeader;
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for (i = num_sections - 1; i >= 0; i--) {
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IMAGE_SECTION_HEADER *sec = §ions[i];
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virt_size = max_t(unsigned long, virt_size,
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sec->VirtualAddress + sec->Misc.VirtualSize);
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}
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/* Read 32/64bit specific header bits */
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if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
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IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
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IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
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image_base = opt->ImageBase;
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image_size = opt->SizeOfImage;
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efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
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efi_reloc = efi_alloc(virt_size,
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loaded_image_info->image_code_type);
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if (!efi_reloc) {
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printf("%s: Could not allocate %lu bytes\n",
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__func__, virt_size);
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return NULL;
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}
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entry = efi_reloc + opt->AddressOfEntryPoint;
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rel_size = opt->DataDirectory[rel_idx].Size;
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rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
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virt_size = ALIGN(virt_size, opt->SectionAlignment);
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} else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
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IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
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image_base = opt->ImageBase;
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image_size = opt->SizeOfImage;
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efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
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efi_reloc = efi_alloc(virt_size,
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loaded_image_info->image_code_type);
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if (!efi_reloc) {
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printf("%s: Could not allocate %lu bytes\n",
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__func__, virt_size);
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return NULL;
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}
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entry = efi_reloc + opt->AddressOfEntryPoint;
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rel_size = opt->DataDirectory[rel_idx].Size;
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rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
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virt_size = ALIGN(virt_size, opt->SectionAlignment);
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} else {
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printf("%s: Invalid optional header magic %x\n", __func__,
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nt->OptionalHeader.Magic);
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return NULL;
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}
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/* Load sections into RAM */
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for (i = num_sections - 1; i >= 0; i--) {
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IMAGE_SECTION_HEADER *sec = §ions[i];
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memset(efi_reloc + sec->VirtualAddress, 0,
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sec->Misc.VirtualSize);
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memcpy(efi_reloc + sec->VirtualAddress,
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efi + sec->PointerToRawData,
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sec->SizeOfRawData);
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}
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/* Run through relocations */
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if (efi_loader_relocate(rel, rel_size, efi_reloc,
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(unsigned long)image_base) != EFI_SUCCESS) {
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efi_free_pages((uintptr_t) efi_reloc,
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(virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT);
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return NULL;
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}
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/* Flush cache */
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flush_cache((ulong)efi_reloc,
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ALIGN(virt_size, EFI_CACHELINE_SIZE));
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invalidate_icache_all();
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/* Populate the loaded image interface bits */
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loaded_image_info->image_base = efi;
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loaded_image_info->image_size = image_size;
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loaded_image_info->reloc_base = efi_reloc;
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loaded_image_info->reloc_size = virt_size;
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return entry;
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}
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