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