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/** @file
Provides the services to get the entry point to a PE/COFF image that has either been
loaded into memory or is executing at it's linked address.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Library/PeCoffGetEntryPointLib.h>
#include <Library/DebugLib.h>
#include <IndustryStandard/PeImage.h>
#define PE_COFF_IMAGE_ALIGN_SIZE 4
/**
Retrieves and returns a pointer to the entry point to a PE/COFF image that has been loaded
into system memory with the PE/COFF Loader Library functions.
Retrieves the entry point to the PE/COFF image specified by Pe32Data and returns this entry
point in EntryPoint. If the entry point could not be retrieved from the PE/COFF image, then
return RETURN_INVALID_PARAMETER. Otherwise return RETURN_SUCCESS.
If Pe32Data is NULL, then ASSERT().
If EntryPoint is NULL, then ASSERT().
@param Pe32Data The pointer to the PE/COFF image that is loaded in system memory.
@param EntryPoint The pointer to entry point to the PE/COFF image to return.
@retval RETURN_SUCCESS EntryPoint was returned.
@retval RETURN_INVALID_PARAMETER The entry point could not be found in the PE/COFF image.
**/
RETURN_STATUS
EFIAPI
PeCoffLoaderGetEntryPoint (
IN VOID *Pe32Data,
OUT VOID **EntryPoint
)
{
EFI_IMAGE_DOS_HEADER *DosHdr;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
ASSERT (Pe32Data != NULL);
ASSERT (EntryPoint != NULL);
DosHdr = (EFI_IMAGE_DOS_HEADER *)Pe32Data;
if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image header.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN) Pe32Data + (UINTN) ((DosHdr->e_lfanew) & 0x0ffff));
} else {
//
// DOS image header is not present, so PE header is at the image base.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)Pe32Data;
}
//
// Calculate the entry point relative to the start of the image.
// AddressOfEntryPoint is common for PE32 & PE32+
//
if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) {
*EntryPoint = (VOID *)((UINTN)Pe32Data + (UINTN)(Hdr.Te->AddressOfEntryPoint & 0x0ffffffff) + sizeof(EFI_TE_IMAGE_HEADER) - Hdr.Te->StrippedSize);
return RETURN_SUCCESS;
} else if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
*EntryPoint = (VOID *)((UINTN)Pe32Data + (UINTN)(Hdr.Pe32->OptionalHeader.AddressOfEntryPoint & 0x0ffffffff));
return RETURN_SUCCESS;
}
return RETURN_UNSUPPORTED;
}
/**
Returns the machine type of a PE/COFF image.
Returns the machine type from the PE/COFF image specified by Pe32Data.
If Pe32Data is NULL, then ASSERT().
@param Pe32Data The pointer to the PE/COFF image that is loaded in system
memory.
@return Machine type or zero if not a valid image.
**/
UINT16
EFIAPI
PeCoffLoaderGetMachineType (
IN VOID *Pe32Data
)
{
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
EFI_IMAGE_DOS_HEADER *DosHdr;
ASSERT (Pe32Data != NULL);
DosHdr = (EFI_IMAGE_DOS_HEADER *)Pe32Data;
if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image header.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN) Pe32Data + (UINTN) ((DosHdr->e_lfanew) & 0x0ffff));
} else {
//
// DOS image header is not present, so PE header is at the image base.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)Pe32Data;
}
if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) {
return Hdr.Te->Machine;
} else if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
return Hdr.Pe32->FileHeader.Machine;
}
return 0x0000;
}
/**
Returns a pointer to the PDB file name for a PE/COFF image that has been
loaded into system memory with the PE/COFF Loader Library functions.
Returns the PDB file name for the PE/COFF image specified by Pe32Data. If
the PE/COFF image specified by Pe32Data is not a valid, then NULL is
returned. If the PE/COFF image specified by Pe32Data does not contain a
debug directory entry, then NULL is returned. If the debug directory entry
in the PE/COFF image specified by Pe32Data does not contain a PDB file name,
then NULL is returned.
If Pe32Data is NULL, then ASSERT().
@param Pe32Data The pointer to the PE/COFF image that is loaded in system
memory.
@return The PDB file name for the PE/COFF image specified by Pe32Data or NULL
if it cannot be retrieved.
**/
VOID *
EFIAPI
PeCoffLoaderGetPdbPointer (
IN VOID *Pe32Data
)
{
EFI_IMAGE_DOS_HEADER *DosHdr;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
EFI_IMAGE_DATA_DIRECTORY *DirectoryEntry;
EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *DebugEntry;
UINTN DirCount;
VOID *CodeViewEntryPointer;
INTN TEImageAdjust;
UINT32 NumberOfRvaAndSizes;
UINT16 Magic;
ASSERT (Pe32Data != NULL);
TEImageAdjust = 0;
DirectoryEntry = NULL;
DebugEntry = NULL;
NumberOfRvaAndSizes = 0;
DosHdr = (EFI_IMAGE_DOS_HEADER *)Pe32Data;
if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image header.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN) Pe32Data + (UINTN) ((DosHdr->e_lfanew) & 0x0ffff));
} else {
//
// DOS image header is not present, so PE header is at the image base.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)Pe32Data;
}
if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) {
if (Hdr.Te->DataDirectory[EFI_TE_IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress != 0) {
DirectoryEntry = &Hdr.Te->DataDirectory[EFI_TE_IMAGE_DIRECTORY_ENTRY_DEBUG];
TEImageAdjust = sizeof (EFI_TE_IMAGE_HEADER) - Hdr.Te->StrippedSize;
DebugEntry = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *)((UINTN) Hdr.Te +
Hdr.Te->DataDirectory[EFI_TE_IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress +
TEImageAdjust);
}
} else if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
//
// NOTE: We use Machine field to identify PE32/PE32+, instead of Magic.
// It is due to backward-compatibility, for some system might
// generate PE32+ image with PE32 Magic.
//
switch (Hdr.Pe32->FileHeader.Machine) {
case IMAGE_FILE_MACHINE_I386:
//
// Assume PE32 image with IA32 Machine field.
//
Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC;
break;
case IMAGE_FILE_MACHINE_X64:
case IMAGE_FILE_MACHINE_IA64:
//
// Assume PE32+ image with x64 or IA64 Machine field
//
Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;
break;
default:
//
// For unknow Machine field, use Magic in optional Header
//
Magic = Hdr.Pe32->OptionalHeader.Magic;
}
if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
//
// Use PE32 offset get Debug Directory Entry
//
NumberOfRvaAndSizes = Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes;
DirectoryEntry = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
DebugEntry = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *) ((UINTN) Pe32Data + DirectoryEntry->VirtualAddress);
} else if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
//
// Use PE32+ offset get Debug Directory Entry
//
NumberOfRvaAndSizes = Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes;
DirectoryEntry = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
DebugEntry = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *) ((UINTN) Pe32Data + DirectoryEntry->VirtualAddress);
}
if (NumberOfRvaAndSizes <= EFI_IMAGE_DIRECTORY_ENTRY_DEBUG) {
DirectoryEntry = NULL;
DebugEntry = NULL;
}
} else {
return NULL;
}
if (DebugEntry == NULL || DirectoryEntry == NULL) {
return NULL;
}
//
// Scan the directory to find the debug entry.
//
for (DirCount = 0; DirCount < DirectoryEntry->Size; DirCount += sizeof (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY), DebugEntry++) {
if (DebugEntry->Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW) {
if (DebugEntry->SizeOfData > 0) {
CodeViewEntryPointer = (VOID *) ((UINTN) DebugEntry->RVA + ((UINTN)Pe32Data) + (UINTN)TEImageAdjust);
switch (* (UINT32 *) CodeViewEntryPointer) {
case CODEVIEW_SIGNATURE_NB10:
return (VOID *) ((CHAR8 *)CodeViewEntryPointer + sizeof (EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY));
case CODEVIEW_SIGNATURE_RSDS:
return (VOID *) ((CHAR8 *)CodeViewEntryPointer + sizeof (EFI_IMAGE_DEBUG_CODEVIEW_RSDS_ENTRY));
case CODEVIEW_SIGNATURE_MTOC:
return (VOID *) ((CHAR8 *)CodeViewEntryPointer + sizeof (EFI_IMAGE_DEBUG_CODEVIEW_MTOC_ENTRY));
default:
break;
}
}
}
}
return NULL;
}
/**
Returns the size of the PE/COFF headers
Returns the size of the PE/COFF header specified by Pe32Data.
If Pe32Data is NULL, then ASSERT().
@param Pe32Data The pointer to the PE/COFF image that is loaded in system
memory.
@return Size of PE/COFF header in bytes or zero if not a valid image.
**/
UINT32
EFIAPI
PeCoffGetSizeOfHeaders (
IN VOID *Pe32Data
)
{
EFI_IMAGE_DOS_HEADER *DosHdr;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
UINTN SizeOfHeaders;
ASSERT (Pe32Data != NULL);
DosHdr = (EFI_IMAGE_DOS_HEADER *)Pe32Data;
if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image header.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN) Pe32Data + (UINTN) ((DosHdr->e_lfanew) & 0x0ffff));
} else {
//
// DOS image header is not present, so PE header is at the image base.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)Pe32Data;
}
if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) {
SizeOfHeaders = sizeof (EFI_TE_IMAGE_HEADER) + (UINTN)Hdr.Te->BaseOfCode - (UINTN)Hdr.Te->StrippedSize;
} else if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
SizeOfHeaders = Hdr.Pe32->OptionalHeader.SizeOfHeaders;
} else {
SizeOfHeaders = 0;
}
return (UINT32) SizeOfHeaders;
}
/**
Returns PE/COFF image base is loaded in system memory where the input address is in.
On DEBUG build, searches the PE/COFF image base forward the input address and
returns it.
@param Address Address located in one PE/COFF image.
@retval 0 RELEASE build or cannot find the PE/COFF image base.
@retval others PE/COFF image base found.
**/
UINTN
EFIAPI
PeCoffSearchImageBase (
IN UINTN Address
)
{
UINTN Pe32Data;
Pe32Data = 0;
DEBUG_CODE_BEGIN ();
EFI_IMAGE_DOS_HEADER *DosHdr;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
//
// Find Image Base
//
Pe32Data = Address & ~(PE_COFF_IMAGE_ALIGN_SIZE - 1);
while (Pe32Data != 0) {
DosHdr = (EFI_IMAGE_DOS_HEADER *) Pe32Data;
if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image header.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)(Pe32Data + (UINTN) ((DosHdr->e_lfanew) & 0x0ffff));
//
// Make sure PE header address does not overflow and is less than the initial address.
//
if (((UINTN)Hdr.Pe32 > Pe32Data) && ((UINTN)Hdr.Pe32 < Address)) {
if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
break;
}
}
} else {
//
// DOS image header is not present, TE header is at the image base.
//
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)Pe32Data;
if ((Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) &&
((Hdr.Te->Machine == IMAGE_FILE_MACHINE_I386) || (Hdr.Te->Machine == IMAGE_FILE_MACHINE_IA64) ||
(Hdr.Te->Machine == IMAGE_FILE_MACHINE_EBC) || (Hdr.Te->Machine == IMAGE_FILE_MACHINE_X64) ||
(Hdr.Te->Machine == IMAGE_FILE_MACHINE_ARM64) || (Hdr.Te->Machine == IMAGE_FILE_MACHINE_ARMTHUMB_MIXED))
) {
break;
}
}
//
// Not found the image base, check the previous aligned address
//
Pe32Data -= PE_COFF_IMAGE_ALIGN_SIZE;
}
DEBUG_CODE_END ();
return Pe32Data;
}
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