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/*
* EFI image loader
*
* based partly on wine code
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
#include <pe.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID;
const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID;
efi_status_t EFIAPI efi_return_handle(void *handle, efi_guid_t *protocol,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
*protocol_interface = handle;
return EFI_SUCCESS;
}
static void efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
unsigned long rel_size, void *efi_reloc)
{
const IMAGE_BASE_RELOCATION *end;
int i;
end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
while (rel < end - 1 && rel->SizeOfBlock) {
const uint16_t *relocs = (const uint16_t *)(rel + 1);
i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
while (i--) {
uint16_t offset = (*relocs & 0xfff) +
rel->VirtualAddress;
int type = *relocs >> EFI_PAGE_SHIFT;
unsigned long delta = (unsigned long)efi_reloc;
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;
default:
printf("Unknown Relocation off %x type %x\n",
offset, type);
}
relocs++;
}
rel = (const IMAGE_BASE_RELOCATION *)relocs;
}
}
void __weak invalidate_icache_all(void)
{
/* If the system doesn't support icache_all flush, cross our fingers */
}
/*
* This function loads all sections from a PE binary into a newly reserved
* piece of memory. On successful load it then returns the entry point for
* the binary. Otherwise NULL.
*/
void *efi_load_pe(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;
void *entry;
uint64_t image_size;
unsigned long virt_size = 0;
bool can_run_nt64 = true;
bool can_run_nt32 = true;
#if defined(CONFIG_ARM64)
can_run_nt32 = false;
#elif defined(CONFIG_ARM)
can_run_nt64 = false;
#endif
dos = efi;
if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
printf("%s: Invalid DOS Signature\n", __func__);
return NULL;
}
nt = (void *) ((char *)efi + dos->e_lfanew);
if (nt->Signature != IMAGE_NT_SIGNATURE) {
printf("%s: Invalid NT Signature\n", __func__);
return NULL;
}
/* 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 = §ions[i];
virt_size = max_t(unsigned long, virt_size,
sec->VirtualAddress + sec->Misc.VirtualSize);
}
/* Read 32/64bit specific header bits */
if (can_run_nt64 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)) {
IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
image_size = opt->SizeOfImage;
efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA);
if (!efi_reloc) {
printf("%s: Could not allocate %ld bytes\n",
__func__, virt_size);
return NULL;
}
entry = efi_reloc + opt->AddressOfEntryPoint;
rel_size = opt->DataDirectory[rel_idx].Size;
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
} else if (can_run_nt32 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)) {
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
image_size = opt->SizeOfImage;
efi_reloc = efi_alloc(virt_size, EFI_LOADER_DATA);
if (!efi_reloc) {
printf("%s: Could not allocate %ld bytes\n",
__func__, virt_size);
return NULL;
}
entry = efi_reloc + opt->AddressOfEntryPoint;
rel_size = opt->DataDirectory[rel_idx].Size;
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
} else {
printf("%s: Invalid optional header magic %x\n", __func__,
nt->OptionalHeader.Magic);
return NULL;
}
/* Load sections into RAM */
for (i = num_sections - 1; i >= 0; i--) {
IMAGE_SECTION_HEADER *sec = §ions[i];
memset(efi_reloc + sec->VirtualAddress, 0,
sec->Misc.VirtualSize);
memcpy(efi_reloc + sec->VirtualAddress,
efi + sec->PointerToRawData,
sec->SizeOfRawData);
}
/* Run through relocations */
efi_loader_relocate(rel, rel_size, efi_reloc);
/* Flush cache */
flush_cache((ulong)efi_reloc, virt_size);
invalidate_icache_all();
/* Populate the loaded image interface bits */
loaded_image_info->image_base = efi;
loaded_image_info->image_size = image_size;
return entry;
}
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