| /* |
| * EFI image loader |
| * |
| * based partly on wine code |
| * |
| * Copyright (c) 2016 Alexander Graf |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <efi_loader.h> |
| #include <pe.h> |
| #include <asm/global_data.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID; |
| const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID; |
| |
| efi_status_t EFIAPI efi_return_handle(void *handle, efi_guid_t *protocol, |
| void **protocol_interface, void *agent_handle, |
| void *controller_handle, uint32_t attributes) |
| { |
| EFI_ENTRY("%p, %p, %p, %p, %p, 0x%x", handle, protocol, |
| protocol_interface, agent_handle, controller_handle, |
| attributes); |
| *protocol_interface = handle; |
| return EFI_EXIT(EFI_SUCCESS); |
| } |
| |
| static void 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--) { |
| uint16_t offset = (*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); |
| } |
| relocs++; |
| } |
| rel = (const IMAGE_BASE_RELOCATION *)relocs; |
| } |
| } |
| |
| void __weak invalidate_icache_all(void) |
| { |
| /* If the system doesn't support icache_all flush, cross our fingers */ |
| } |
| |
| /* |
| * 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; |
| bool can_run_nt64 = true; |
| bool can_run_nt32 = true; |
| |
| #if defined(CONFIG_ARM64) |
| can_run_nt32 = false; |
| #elif defined(CONFIG_ARM) |
| can_run_nt64 = false; |
| #endif |
| |
| 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; |
| } |
| |
| /* 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 (can_run_nt64 && |
| (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_reloc = efi_alloc(virt_size, EFI_LOADER_DATA); |
| if (!efi_reloc) { |
| printf("%s: Could not allocate %ld 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; |
| } else if (can_run_nt32 && |
| (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)) { |
| IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader; |
| image_size = opt->SizeOfImage; |
| efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA); |
| if (!efi_reloc) { |
| printf("%s: Could not allocate %ld 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; |
| } 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 */ |
| efi_loader_relocate(rel, rel_size, efi_reloc); |
| |
| /* Flush cache */ |
| flush_cache((ulong)efi_reloc, virt_size); |
| invalidate_icache_all(); |
| |
| /* Populate the loaded image interface bits */ |
| loaded_image_info->image_base = efi; |
| loaded_image_info->image_size = image_size; |
| |
| return entry; |
| } |