lib/efi_loader/efi_image_loader.c

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