u-boot/lib/efi_loader/efi_image_loader.c
Heinrich Schuchardt 126a43f15b efi_loader: unload applications upon Exit()
Implement unloading of images in the Exit() boot services:

* unload images that are not yet started,
* unload started applications,
* unload drivers returning an error.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-05-07 21:10:03 +02:00

343 lines
9.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* EFI image loader
*
* based partly on wine code
*
* Copyright (c) 2016 Alexander Graf
*/
#include <common.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;
}