1 // SPDX-License-Identifier: GPL-2.0+
5 * based partly on wine code
7 * Copyright (c) 2016 Alexander Graf
11 #include <efi_loader.h>
14 const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
15 const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID;
16 const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID;
17 const efi_guid_t efi_simple_file_system_protocol_guid =
18 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
19 const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
21 static int machines[] = {
22 #if defined(CONFIG_ARM64)
23 IMAGE_FILE_MACHINE_ARM64,
24 #elif defined(CONFIG_ARM)
25 IMAGE_FILE_MACHINE_ARM,
26 IMAGE_FILE_MACHINE_THUMB,
27 IMAGE_FILE_MACHINE_ARMNT,
30 #if defined(CONFIG_X86_64)
31 IMAGE_FILE_MACHINE_AMD64,
32 #elif defined(CONFIG_X86)
33 IMAGE_FILE_MACHINE_I386,
36 #if defined(CONFIG_CPU_RISCV_32)
37 IMAGE_FILE_MACHINE_RISCV32,
40 #if defined(CONFIG_CPU_RISCV_64)
41 IMAGE_FILE_MACHINE_RISCV64,
46 * Print information about a loaded image.
48 * If the program counter is located within the image the offset to the base
51 * @image: loaded image
52 * @pc: program counter (use NULL to suppress offset output)
53 * @return: status code
55 efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc)
58 return EFI_INVALID_PARAMETER;
60 printf(" [0x%p:0x%p]",
61 image->reloc_base, image->reloc_base + image->reloc_size - 1);
62 if (pc && pc >= image->reloc_base &&
63 pc < image->reloc_base + image->reloc_size)
64 printf(" pc=0x%zx", pc - image->reloc_base);
66 printf(" '%pD'", image->file_path);
72 * Print information about all loaded images.
74 * @pc: program counter (use NULL to suppress offset output)
76 void efi_print_image_infos(void *pc)
78 struct efi_object *efiobj;
79 struct efi_handler *handler;
81 list_for_each_entry(efiobj, &efi_obj_list, link) {
82 list_for_each_entry(handler, &efiobj->protocols, link) {
83 if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
85 handler->protocol_interface, pc);
91 static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
92 unsigned long rel_size, void *efi_reloc,
93 unsigned long pref_address)
95 unsigned long delta = (unsigned long)efi_reloc - pref_address;
96 const IMAGE_BASE_RELOCATION *end;
102 end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
103 while (rel < end - 1 && rel->SizeOfBlock) {
104 const uint16_t *relocs = (const uint16_t *)(rel + 1);
105 i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
107 uint32_t offset = (uint32_t)(*relocs & 0xfff) +
109 int type = *relocs >> EFI_PAGE_SHIFT;
110 uint64_t *x64 = efi_reloc + offset;
111 uint32_t *x32 = efi_reloc + offset;
112 uint16_t *x16 = efi_reloc + offset;
115 case IMAGE_REL_BASED_ABSOLUTE:
117 case IMAGE_REL_BASED_HIGH:
118 *x16 += ((uint32_t)delta) >> 16;
120 case IMAGE_REL_BASED_LOW:
121 *x16 += (uint16_t)delta;
123 case IMAGE_REL_BASED_HIGHLOW:
124 *x32 += (uint32_t)delta;
126 case IMAGE_REL_BASED_DIR64:
127 *x64 += (uint64_t)delta;
130 printf("Unknown Relocation off %x type %x\n",
132 return EFI_LOAD_ERROR;
136 rel = (const IMAGE_BASE_RELOCATION *)relocs;
141 void __weak invalidate_icache_all(void)
143 /* If the system doesn't support icache_all flush, cross our fingers */
147 * Determine the memory types to be used for code and data.
149 * @loaded_image_info image descriptor
150 * @image_type field Subsystem of the optional header for
151 * Windows specific field
153 static void efi_set_code_and_data_type(
154 struct efi_loaded_image *loaded_image_info,
157 switch (image_type) {
158 case IMAGE_SUBSYSTEM_EFI_APPLICATION:
159 loaded_image_info->image_code_type = EFI_LOADER_CODE;
160 loaded_image_info->image_data_type = EFI_LOADER_DATA;
162 case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
163 loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE;
164 loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
166 case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
167 case IMAGE_SUBSYSTEM_EFI_ROM:
168 loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
169 loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
172 printf("%s: invalid image type: %u\n", __func__, image_type);
173 /* Let's assume it is an application */
174 loaded_image_info->image_code_type = EFI_LOADER_CODE;
175 loaded_image_info->image_data_type = EFI_LOADER_DATA;
181 * This function loads all sections from a PE binary into a newly reserved
182 * piece of memory. On successful load it then returns the entry point for
183 * the binary. Otherwise NULL.
185 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
187 IMAGE_NT_HEADERS32 *nt;
188 IMAGE_DOS_HEADER *dos;
189 IMAGE_SECTION_HEADER *sections;
193 const IMAGE_BASE_RELOCATION *rel;
194 unsigned long rel_size;
195 int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC;
199 unsigned long virt_size = 0;
203 if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
204 printf("%s: Invalid DOS Signature\n", __func__);
208 nt = (void *) ((char *)efi + dos->e_lfanew);
209 if (nt->Signature != IMAGE_NT_SIGNATURE) {
210 printf("%s: Invalid NT Signature\n", __func__);
214 for (i = 0; machines[i]; i++)
215 if (machines[i] == nt->FileHeader.Machine) {
221 printf("%s: Machine type 0x%04x is not supported\n",
222 __func__, nt->FileHeader.Machine);
226 /* Calculate upper virtual address boundary */
227 num_sections = nt->FileHeader.NumberOfSections;
228 sections = (void *)&nt->OptionalHeader +
229 nt->FileHeader.SizeOfOptionalHeader;
231 for (i = num_sections - 1; i >= 0; i--) {
232 IMAGE_SECTION_HEADER *sec = §ions[i];
233 virt_size = max_t(unsigned long, virt_size,
234 sec->VirtualAddress + sec->Misc.VirtualSize);
237 /* Read 32/64bit specific header bits */
238 if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
239 IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
240 IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
241 image_base = opt->ImageBase;
242 image_size = opt->SizeOfImage;
243 efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
244 efi_reloc = efi_alloc(virt_size,
245 loaded_image_info->image_code_type);
247 printf("%s: Could not allocate %lu bytes\n",
248 __func__, virt_size);
251 entry = efi_reloc + opt->AddressOfEntryPoint;
252 rel_size = opt->DataDirectory[rel_idx].Size;
253 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
254 virt_size = ALIGN(virt_size, opt->SectionAlignment);
255 } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
256 IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
257 image_base = opt->ImageBase;
258 image_size = opt->SizeOfImage;
259 efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
260 efi_reloc = efi_alloc(virt_size,
261 loaded_image_info->image_code_type);
263 printf("%s: Could not allocate %lu bytes\n",
264 __func__, virt_size);
267 entry = efi_reloc + opt->AddressOfEntryPoint;
268 rel_size = opt->DataDirectory[rel_idx].Size;
269 rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
270 virt_size = ALIGN(virt_size, opt->SectionAlignment);
272 printf("%s: Invalid optional header magic %x\n", __func__,
273 nt->OptionalHeader.Magic);
277 /* Load sections into RAM */
278 for (i = num_sections - 1; i >= 0; i--) {
279 IMAGE_SECTION_HEADER *sec = §ions[i];
280 memset(efi_reloc + sec->VirtualAddress, 0,
281 sec->Misc.VirtualSize);
282 memcpy(efi_reloc + sec->VirtualAddress,
283 efi + sec->PointerToRawData,
287 /* Run through relocations */
288 if (efi_loader_relocate(rel, rel_size, efi_reloc,
289 (unsigned long)image_base) != EFI_SUCCESS) {
290 efi_free_pages((uintptr_t) efi_reloc,
291 (virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT);
296 flush_cache((ulong)efi_reloc,
297 ALIGN(virt_size, EFI_CACHELINE_SIZE));
298 invalidate_icache_all();
300 /* Populate the loaded image interface bits */
301 loaded_image_info->image_base = efi;
302 loaded_image_info->image_size = image_size;
303 loaded_image_info->reloc_base = efi_reloc;
304 loaded_image_info->reloc_size = virt_size;