1 files changed, 344 insertions, 0 deletions

diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
new file mode 100644
index 00000000..d5de6df1
--- /dev/null
+++ b/lib/efi_loader/efi_image_loader.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI image loader
+ *
+ *  based partly on wine code
+ *
+ *  Copyright (c) 2016 Alexander Graf
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <efi_loader.h>
+#include <pe.h>
+
+const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
+const efi_guid_t efi_guid_device_path = EFI_DEVICE_PATH_PROTOCOL_GUID;
+const efi_guid_t efi_guid_loaded_image = EFI_LOADED_IMAGE_PROTOCOL_GUID;
+const efi_guid_t efi_guid_loaded_image_device_path =
+		EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID;
+const efi_guid_t efi_simple_file_system_protocol_guid =
+		EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
+const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
+
+static int machines[] = {
+#if defined(__aarch64__)
+	IMAGE_FILE_MACHINE_ARM64,
+#elif defined(__arm__)
+	IMAGE_FILE_MACHINE_ARM,
+	IMAGE_FILE_MACHINE_THUMB,
+	IMAGE_FILE_MACHINE_ARMNT,
+#endif
+
+#if defined(__x86_64__)
+	IMAGE_FILE_MACHINE_AMD64,
+#elif defined(__i386__)
+	IMAGE_FILE_MACHINE_I386,
+#endif
+
+#if defined(__riscv) && (__riscv_xlen == 32)
+	IMAGE_FILE_MACHINE_RISCV32,
+#endif
+
+#if defined(__riscv) && (__riscv_xlen == 64)
+	IMAGE_FILE_MACHINE_RISCV64,
+#endif
+	0 };
+
+/**
+ * efi_print_image_info() - print information about a loaded image
+ *
+ * If the program counter is located within the image the offset to the base
+ * address is shown.
+ *
+ * @obj:	EFI object
+ * @image:	loaded image
+ * @pc:		program counter (use NULL to suppress offset output)
+ * Return:	status code
+ */
+static efi_status_t efi_print_image_info(struct efi_loaded_image_obj *obj,
+					 struct efi_loaded_image *image,
+					 void *pc)
+{
+	printf("UEFI image");
+	printf(" [0x%p:0x%p]",
+	       image->image_base, image->image_base + image->image_size - 1);
+	if (pc && pc >= image->image_base &&
+	    pc < image->image_base + image->image_size)
+		printf(" pc=0x%zx", pc - image->image_base);
+	if (image->file_path)
+		printf(" '%pD'", image->file_path);
+	printf("\n");
+	return EFI_SUCCESS;
+}
+
+/**
+ * efi_print_image_infos() - print information about all loaded images
+ *
+ * @pc:		program counter (use NULL to suppress offset output)
+ */
+void efi_print_image_infos(void *pc)
+{
+	struct efi_object *efiobj;
+	struct efi_handler *handler;
+
+	list_for_each_entry(efiobj, &efi_obj_list, link) {
+		list_for_each_entry(handler, &efiobj->protocols, link) {
+			if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
+				efi_print_image_info(
+					(struct efi_loaded_image_obj *)efiobj,
+					handler->protocol_interface, pc);
+			}
+		}
+	}
+}
+
+/**
+ * efi_loader_relocate() - relocate UEFI binary
+ *
+ * @rel:		pointer to the relocation table
+ * @rel_size:		size of the relocation table in bytes
+ * @efi_reloc:		actual load address of the image
+ * @pref_address:	preferred load address of the image
+ * Return:		status code
+ */
+static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
+			unsigned long rel_size, void *efi_reloc,
+			unsigned long pref_address)
+{
+	unsigned long delta = (unsigned long)efi_reloc - pref_address;
+	const IMAGE_BASE_RELOCATION *end;
+	int i;
+
+	if (delta == 0)
+		return EFI_SUCCESS;
+
+	end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
+	while (rel < end && rel->SizeOfBlock) {
+		const uint16_t *relocs = (const uint16_t *)(rel + 1);
+		i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
+		while (i--) {
+			uint32_t offset = (uint32_t)(*relocs & 0xfff) +
+					  rel->VirtualAddress;
+			int type = *relocs >> EFI_PAGE_SHIFT;
+			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;
+#ifdef __riscv
+			case IMAGE_REL_BASED_RISCV_HI20:
+				*x32 = ((*x32 & 0xfffff000) + (uint32_t)delta) |
+					(*x32 & 0x00000fff);
+				break;
+			case IMAGE_REL_BASED_RISCV_LOW12I:
+			case IMAGE_REL_BASED_RISCV_LOW12S:
+				/* We know that we're 4k aligned */
+				if (delta & 0xfff) {
+					printf("Unsupported reloc offset\n");
+					return EFI_LOAD_ERROR;
+				}
+				break;
+#endif
+			default:
+				printf("Unknown Relocation off %x type %x\n",
+				       offset, type);
+				return EFI_LOAD_ERROR;
+			}
+			relocs++;
+		}
+		rel = (const IMAGE_BASE_RELOCATION *)relocs;
+	}
+	return EFI_SUCCESS;
+}
+
+void __weak invalidate_icache_all(void)
+{
+	/* If the system doesn't support icache_all flush, cross our fingers */
+}
+
+/**
+ * efi_set_code_and_data_type() - determine the memory types to be used for code
+ *				  and data.
+ *
+ * @loaded_image_info:	image descriptor
+ * @image_type:		field Subsystem of the optional header for
+ *			Windows specific field
+ */
+static void efi_set_code_and_data_type(
+			struct efi_loaded_image *loaded_image_info,
+			uint16_t image_type)
+{
+	switch (image_type) {
+	case IMAGE_SUBSYSTEM_EFI_APPLICATION:
+		loaded_image_info->image_code_type = EFI_LOADER_CODE;
+		loaded_image_info->image_data_type = EFI_LOADER_DATA;
+		break;
+	case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
+		loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE;
+		loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
+		break;
+	case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
+	case IMAGE_SUBSYSTEM_EFI_ROM:
+		loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
+		loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
+		break;
+	default:
+		printf("%s: invalid image type: %u\n", __func__, image_type);
+		/* Let's assume it is an application */
+		loaded_image_info->image_code_type = EFI_LOADER_CODE;
+		loaded_image_info->image_data_type = EFI_LOADER_DATA;
+		break;
+	}
+}
+
+/**
+ * efi_load_pe() - relocate EFI binary
+ *
+ * This function loads all sections from a PE binary into a newly reserved
+ * piece of memory. On success the entry point is returned as handle->entry.
+ *
+ * @handle:		loaded image handle
+ * @efi:		pointer to the EFI binary
+ * @loaded_image_info:	loaded image protocol
+ * Return:		status code
+ */
+efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, 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;
+	uint64_t image_base;
+	unsigned long virt_size = 0;
+	int supported = 0;
+
+	dos = efi;
+	if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
+		printf("%s: Invalid DOS Signature\n", __func__);
+		return EFI_LOAD_ERROR;
+	}
+
+	nt = (void *) ((char *)efi + dos->e_lfanew);
+	if (nt->Signature != IMAGE_NT_SIGNATURE) {
+		printf("%s: Invalid NT Signature\n", __func__);
+		return EFI_LOAD_ERROR;
+	}
+
+	for (i = 0; machines[i]; i++)
+		if (machines[i] == nt->FileHeader.Machine) {
+			supported = 1;
+			break;
+		}
+
+	if (!supported) {
+		printf("%s: Machine type 0x%04x is not supported\n",
+		       __func__, nt->FileHeader.Machine);
+		return EFI_LOAD_ERROR;
+	}
+
+	/* 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 = &sections[i];
+		virt_size = max_t(unsigned long, virt_size,
+				  sec->VirtualAddress + sec->Misc.VirtualSize);
+	}
+
+	/* Read 32/64bit specific header bits */
+	if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
+		IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
+		IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
+		image_base = opt->ImageBase;
+		efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
+		handle->image_type = opt->Subsystem;
+		efi_reloc = efi_alloc(virt_size,
+				      loaded_image_info->image_code_type);
+		if (!efi_reloc) {
+			printf("%s: Could not allocate %lu bytes\n",
+			       __func__, virt_size);
+			return EFI_OUT_OF_RESOURCES;
+		}
+		handle->entry = efi_reloc + opt->AddressOfEntryPoint;
+		rel_size = opt->DataDirectory[rel_idx].Size;
+		rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
+		virt_size = ALIGN(virt_size, opt->SectionAlignment);
+	} else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+		IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
+		image_base = opt->ImageBase;
+		efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
+		handle->image_type = opt->Subsystem;
+		efi_reloc = efi_alloc(virt_size,
+				      loaded_image_info->image_code_type);
+		if (!efi_reloc) {
+			printf("%s: Could not allocate %lu bytes\n",
+			       __func__, virt_size);
+			return EFI_OUT_OF_RESOURCES;
+		}
+		handle->entry = efi_reloc + opt->AddressOfEntryPoint;
+		rel_size = opt->DataDirectory[rel_idx].Size;
+		rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
+		virt_size = ALIGN(virt_size, opt->SectionAlignment);
+	} else {
+		printf("%s: Invalid optional header magic %x\n", __func__,
+		       nt->OptionalHeader.Magic);
+		return EFI_LOAD_ERROR;
+	}
+
+	/* Copy PE headers */
+	memcpy(efi_reloc, efi, sizeof(*dos) + sizeof(*nt)
+	       + nt->FileHeader.SizeOfOptionalHeader
+	       + num_sections * sizeof(IMAGE_SECTION_HEADER));
+
+	/* Load sections into RAM */
+	for (i = num_sections - 1; i >= 0; i--) {
+		IMAGE_SECTION_HEADER *sec = &sections[i];
+		memset(efi_reloc + sec->VirtualAddress, 0,
+		       sec->Misc.VirtualSize);
+		memcpy(efi_reloc + sec->VirtualAddress,
+		       efi + sec->PointerToRawData,
+		       sec->SizeOfRawData);
+	}
+
+	/* Run through relocations */
+	if (efi_loader_relocate(rel, rel_size, efi_reloc,
+				(unsigned long)image_base) != EFI_SUCCESS) {
+		efi_free_pages((uintptr_t) efi_reloc,
+			       (virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT);
+		return EFI_LOAD_ERROR;
+	}
+
+	/* Flush cache */
+	flush_cache((ulong)efi_reloc,
+		    ALIGN(virt_size, EFI_CACHELINE_SIZE));
+	invalidate_icache_all();
+
+	/* Populate the loaded image interface bits */
+	loaded_image_info->image_base = efi_reloc;
+	loaded_image_info->image_size = virt_size;
+
+	return EFI_SUCCESS;
+}