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