sd-boot: add EFI boot manager and stub loader

1 files changed, 172 insertions, 0 deletions

diff --git a/src/sd-boot/pefile.c b/src/sd-boot/pefile.c
new file mode 100644
index 0000000000..e6fedbc929
--- /dev/null
+++ b/src/sd-boot/pefile.c
@@ -0,0 +1,172 @@
+/*-*- 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, &sect);
+                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;
+}