1 /* 2 * EFI image loader 3 * 4 * based partly on wine code 5 * 6 * Copyright (c) 2016 Alexander Graf 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <efi_loader.h> 13 #include <pe.h> 14 #include <asm/global_data.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 18 const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID; 19 const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID; 20 21 efi_status_t EFIAPI efi_return_handle(void *handle, efi_guid_t *protocol, 22 void **protocol_interface, void *agent_handle, 23 void *controller_handle, uint32_t attributes) 24 { 25 EFI_ENTRY("%p, %p, %p, %p, %p, 0x%x", handle, protocol, 26 protocol_interface, agent_handle, controller_handle, 27 attributes); 28 *protocol_interface = handle; 29 return EFI_EXIT(EFI_SUCCESS); 30 } 31 32 static void efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel, 33 unsigned long rel_size, void *efi_reloc) 34 { 35 const IMAGE_BASE_RELOCATION *end; 36 int i; 37 38 end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size); 39 while (rel < end - 1 && rel->SizeOfBlock) { 40 const uint16_t *relocs = (const uint16_t *)(rel + 1); 41 i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t); 42 while (i--) { 43 uint16_t offset = (*relocs & 0xfff) + 44 rel->VirtualAddress; 45 int type = *relocs >> EFI_PAGE_SHIFT; 46 unsigned long delta = (unsigned long)efi_reloc; 47 uint64_t *x64 = efi_reloc + offset; 48 uint32_t *x32 = efi_reloc + offset; 49 uint16_t *x16 = efi_reloc + offset; 50 51 switch (type) { 52 case IMAGE_REL_BASED_ABSOLUTE: 53 break; 54 case IMAGE_REL_BASED_HIGH: 55 *x16 += ((uint32_t)delta) >> 16; 56 break; 57 case IMAGE_REL_BASED_LOW: 58 *x16 += (uint16_t)delta; 59 break; 60 case IMAGE_REL_BASED_HIGHLOW: 61 *x32 += (uint32_t)delta; 62 break; 63 case IMAGE_REL_BASED_DIR64: 64 *x64 += (uint64_t)delta; 65 break; 66 default: 67 printf("Unknown Relocation off %x type %x\n", 68 offset, type); 69 } 70 relocs++; 71 } 72 rel = (const IMAGE_BASE_RELOCATION *)relocs; 73 } 74 } 75 76 void __weak invalidate_icache_all(void) 77 { 78 /* If the system doesn't support icache_all flush, cross our fingers */ 79 } 80 81 /* 82 * This function loads all sections from a PE binary into a newly reserved 83 * piece of memory. On successful load it then returns the entry point for 84 * the binary. Otherwise NULL. 85 */ 86 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info) 87 { 88 IMAGE_NT_HEADERS32 *nt; 89 IMAGE_DOS_HEADER *dos; 90 IMAGE_SECTION_HEADER *sections; 91 int num_sections; 92 void *efi_reloc; 93 int i; 94 const IMAGE_BASE_RELOCATION *rel; 95 unsigned long rel_size; 96 int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC; 97 void *entry; 98 uint64_t image_size; 99 unsigned long virt_size = 0; 100 bool can_run_nt64 = true; 101 bool can_run_nt32 = true; 102 103 #if defined(CONFIG_ARM64) 104 can_run_nt32 = false; 105 #elif defined(CONFIG_ARM) 106 can_run_nt64 = false; 107 #endif 108 109 dos = efi; 110 if (dos->e_magic != IMAGE_DOS_SIGNATURE) { 111 printf("%s: Invalid DOS Signature\n", __func__); 112 return NULL; 113 } 114 115 nt = (void *) ((char *)efi + dos->e_lfanew); 116 if (nt->Signature != IMAGE_NT_SIGNATURE) { 117 printf("%s: Invalid NT Signature\n", __func__); 118 return NULL; 119 } 120 121 /* Calculate upper virtual address boundary */ 122 num_sections = nt->FileHeader.NumberOfSections; 123 sections = (void *)&nt->OptionalHeader + 124 nt->FileHeader.SizeOfOptionalHeader; 125 126 for (i = num_sections - 1; i >= 0; i--) { 127 IMAGE_SECTION_HEADER *sec = §ions[i]; 128 virt_size = max_t(unsigned long, virt_size, 129 sec->VirtualAddress + sec->Misc.VirtualSize); 130 } 131 132 /* Read 32/64bit specific header bits */ 133 if (can_run_nt64 && 134 (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)) { 135 IMAGE_NT_HEADERS64 *nt64 = (void *)nt; 136 IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader; 137 image_size = opt->SizeOfImage; 138 efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA); 139 if (!efi_reloc) { 140 printf("%s: Could not allocate %ld bytes\n", 141 __func__, virt_size); 142 return NULL; 143 } 144 entry = efi_reloc + opt->AddressOfEntryPoint; 145 rel_size = opt->DataDirectory[rel_idx].Size; 146 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; 147 } else if (can_run_nt32 && 148 (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)) { 149 IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader; 150 image_size = opt->SizeOfImage; 151 efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA); 152 if (!efi_reloc) { 153 printf("%s: Could not allocate %ld bytes\n", 154 __func__, virt_size); 155 return NULL; 156 } 157 entry = efi_reloc + opt->AddressOfEntryPoint; 158 rel_size = opt->DataDirectory[rel_idx].Size; 159 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress; 160 } else { 161 printf("%s: Invalid optional header magic %x\n", __func__, 162 nt->OptionalHeader.Magic); 163 return NULL; 164 } 165 166 /* Load sections into RAM */ 167 for (i = num_sections - 1; i >= 0; i--) { 168 IMAGE_SECTION_HEADER *sec = §ions[i]; 169 memset(efi_reloc + sec->VirtualAddress, 0, 170 sec->Misc.VirtualSize); 171 memcpy(efi_reloc + sec->VirtualAddress, 172 efi + sec->PointerToRawData, 173 sec->SizeOfRawData); 174 } 175 176 /* Run through relocations */ 177 efi_loader_relocate(rel, rel_size, efi_reloc); 178 179 /* Flush cache */ 180 flush_cache((ulong)efi_reloc, virt_size); 181 invalidate_icache_all(); 182 183 /* Populate the loaded image interface bits */ 184 loaded_image_info->image_base = efi; 185 loaded_image_info->image_size = image_size; 186 187 return entry; 188 } 189