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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
*/
#include <efi.h>
#include <efilib.h>
#include "util.h"
#include "pefile.h"
struct DosFileHeader {
UINT8 Magic[2];
UINT16 LastSize;
UINT16 nBlocks;
UINT16 nReloc;
UINT16 HdrSize;
UINT16 MinAlloc;
UINT16 MaxAlloc;
UINT16 ss;
UINT16 sp;
UINT16 Checksum;
UINT16 ip;
UINT16 cs;
UINT16 RelocPos;
UINT16 nOverlay;
UINT16 reserved[4];
UINT16 OEMId;
UINT16 OEMInfo;
UINT16 reserved2[10];
UINT32 ExeHeader;
} __attribute__((packed));
#define PE_HEADER_MACHINE_I386 0x014c
#define PE_HEADER_MACHINE_X64 0x8664
struct PeFileHeader {
UINT16 Machine;
UINT16 NumberOfSections;
UINT32 TimeDateStamp;
UINT32 PointerToSymbolTable;
UINT32 NumberOfSymbols;
UINT16 SizeOfOptionalHeader;
UINT16 Characteristics;
} __attribute__((packed));
struct PeSectionHeader {
UINT8 Name[8];
UINT32 VirtualSize;
UINT32 VirtualAddress;
UINT32 SizeOfRawData;
UINT32 PointerToRawData;
UINT32 PointerToRelocations;
UINT32 PointerToLinenumbers;
UINT16 NumberOfRelocations;
UINT16 NumberOfLinenumbers;
UINT32 Characteristics;
} __attribute__((packed));
EFI_STATUS pefile_locate_sections(EFI_FILE *dir, CHAR16 *path, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
EFI_FILE_HANDLE handle;
struct DosFileHeader dos;
uint8_t magic[4];
struct PeFileHeader pe;
UINTN len;
UINTN i;
EFI_STATUS err;
err = uefi_call_wrapper(dir->Open, 5, dir, &handle, path, EFI_FILE_MODE_READ, 0ULL);
if (EFI_ERROR(err))
return err;
/* MS-DOS stub */
len = sizeof(dos);
err = uefi_call_wrapper(handle->Read, 3, handle, &len, &dos);
if (EFI_ERROR(err))
goto out;
if (len != sizeof(dos)) {
err = EFI_LOAD_ERROR;
goto out;
}
if (CompareMem(dos.Magic, "MZ", 2) != 0) {
err = EFI_LOAD_ERROR;
goto out;
}
err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader);
if (EFI_ERROR(err))
goto out;
/* PE header */
len = sizeof(magic);
err = uefi_call_wrapper(handle->Read, 3, handle, &len, &magic);
if (EFI_ERROR(err))
goto out;
if (len != sizeof(magic)) {
err = EFI_LOAD_ERROR;
goto out;
}
if (CompareMem(magic, "PE\0\0", 2) != 0) {
err = EFI_LOAD_ERROR;
goto out;
}
len = sizeof(pe);
err = uefi_call_wrapper(handle->Read, 3, handle, &len, &pe);
if (EFI_ERROR(err))
goto out;
if (len != sizeof(pe)) {
err = EFI_LOAD_ERROR;
goto out;
}
/* PE32+ Subsystem type */
if (pe.Machine != PE_HEADER_MACHINE_X64 &&
pe.Machine != PE_HEADER_MACHINE_I386) {
err = EFI_LOAD_ERROR;
goto out;
}
if (pe.NumberOfSections > 96) {
err = EFI_LOAD_ERROR;
goto out;
}
/* the sections start directly after the headers */
err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader + sizeof(magic) + sizeof(pe) + pe.SizeOfOptionalHeader);
if (EFI_ERROR(err))
goto out;
for (i = 0; i < pe.NumberOfSections; i++) {
struct PeSectionHeader sect;
UINTN j;
len = sizeof(sect);
err = uefi_call_wrapper(handle->Read, 3, handle, &len, §);
if (EFI_ERROR(err))
goto out;
if (len != sizeof(sect)) {
err = EFI_LOAD_ERROR;
goto out;
}
for (j = 0; sections[j]; j++) {
if (CompareMem(sect.Name, sections[j], strlena(sections[j])) != 0)
continue;
if (addrs)
addrs[j] = (UINTN)sect.VirtualAddress;
if (offsets)
offsets[j] = (UINTN)sect.PointerToRawData;
if (sizes)
sizes[j] = (UINTN)sect.VirtualSize;
}
}
out:
uefi_call_wrapper(handle->Close, 1, handle);
return err;
}
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