505 строки
15 KiB
C
505 строки
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1997 Martin Mares
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* Copyright (C) 2007 H. Peter Anvin
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*/
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/*
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* This file builds a disk-image from three different files:
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*
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* - setup: 8086 machine code, sets up system parm
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* - system: 80386 code for actual system
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* - zoffset.h: header with ZO_* defines
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*
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* It does some checking that all files are of the correct type, and writes
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* the result to the specified destination, removing headers and padding to
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* the right amount. It also writes some system data to stdout.
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*/
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/*
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* Changes by tytso to allow root device specification
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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* Cross compiling fixes by Gertjan van Wingerde, July 1996
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* Rewritten by Martin Mares, April 1997
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* Substantially overhauled by H. Peter Anvin, April 2007
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <tools/le_byteshift.h>
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define DEFAULT_MAJOR_ROOT 0
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#define DEFAULT_MINOR_ROOT 0
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#define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT)
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/* Minimal number of setup sectors */
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#define SETUP_SECT_MIN 5
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#define SETUP_SECT_MAX 64
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/* This must be large enough to hold the entire setup */
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u8 buf[SETUP_SECT_MAX*512];
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#define PECOFF_RELOC_RESERVE 0x20
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#ifdef CONFIG_EFI_MIXED
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#define PECOFF_COMPAT_RESERVE 0x20
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#else
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#define PECOFF_COMPAT_RESERVE 0x0
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#endif
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static unsigned long efi32_stub_entry;
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static unsigned long efi64_stub_entry;
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static unsigned long efi_pe_entry;
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static unsigned long efi32_pe_entry;
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static unsigned long kernel_info;
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static unsigned long startup_64;
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static unsigned long _ehead;
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static unsigned long _end;
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/*----------------------------------------------------------------------*/
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static const u32 crctab32[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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0x2d02ef8d
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};
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static u32 partial_crc32_one(u8 c, u32 crc)
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{
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return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
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}
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static u32 partial_crc32(const u8 *s, int len, u32 crc)
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{
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while (len--)
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crc = partial_crc32_one(*s++, crc);
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return crc;
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}
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static void die(const char * str, ...)
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{
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va_list args;
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va_start(args, str);
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vfprintf(stderr, str, args);
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va_end(args);
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fputc('\n', stderr);
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exit(1);
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}
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static void usage(void)
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{
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die("Usage: build setup system zoffset.h image");
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}
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#ifdef CONFIG_EFI_STUB
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static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
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{
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unsigned int pe_header;
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unsigned short num_sections;
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u8 *section;
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pe_header = get_unaligned_le32(&buf[0x3c]);
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num_sections = get_unaligned_le16(&buf[pe_header + 6]);
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#ifdef CONFIG_X86_32
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section = &buf[pe_header + 0xa8];
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#else
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section = &buf[pe_header + 0xb8];
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#endif
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while (num_sections > 0) {
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if (strncmp((char*)section, section_name, 8) == 0) {
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/* section header size field */
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put_unaligned_le32(size, section + 0x8);
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/* section header vma field */
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put_unaligned_le32(vma, section + 0xc);
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/* section header 'size of initialised data' field */
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put_unaligned_le32(datasz, section + 0x10);
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/* section header 'file offset' field */
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put_unaligned_le32(offset, section + 0x14);
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break;
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}
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section += 0x28;
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num_sections--;
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}
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}
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static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
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{
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update_pecoff_section_header_fields(section_name, offset, size, size, offset);
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}
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static void update_pecoff_setup_and_reloc(unsigned int size)
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{
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u32 setup_offset = 0x200;
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u32 reloc_offset = size - PECOFF_RELOC_RESERVE - PECOFF_COMPAT_RESERVE;
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#ifdef CONFIG_EFI_MIXED
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u32 compat_offset = reloc_offset + PECOFF_RELOC_RESERVE;
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#endif
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u32 setup_size = reloc_offset - setup_offset;
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update_pecoff_section_header(".setup", setup_offset, setup_size);
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update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);
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/*
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* Modify .reloc section contents with a single entry. The
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* relocation is applied to offset 10 of the relocation section.
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*/
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put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
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put_unaligned_le32(10, &buf[reloc_offset + 4]);
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#ifdef CONFIG_EFI_MIXED
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update_pecoff_section_header(".compat", compat_offset, PECOFF_COMPAT_RESERVE);
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/*
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* Put the IA-32 machine type (0x14c) and the associated entry point
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* address in the .compat section, so loaders can figure out which other
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* execution modes this image supports.
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*/
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buf[compat_offset] = 0x1;
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buf[compat_offset + 1] = 0x8;
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put_unaligned_le16(0x14c, &buf[compat_offset + 2]);
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put_unaligned_le32(efi32_pe_entry + size, &buf[compat_offset + 4]);
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#endif
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}
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static void update_pecoff_text(unsigned int text_start, unsigned int file_sz,
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unsigned int init_sz)
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{
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unsigned int pe_header;
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unsigned int text_sz = file_sz - text_start;
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unsigned int bss_sz = init_sz - file_sz;
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pe_header = get_unaligned_le32(&buf[0x3c]);
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/*
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* The PE/COFF loader may load the image at an address which is
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* misaligned with respect to the kernel_alignment field in the setup
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* header.
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*
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* In order to avoid relocating the kernel to correct the misalignment,
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* add slack to allow the buffer to be aligned within the declared size
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* of the image.
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*/
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bss_sz += CONFIG_PHYSICAL_ALIGN;
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init_sz += CONFIG_PHYSICAL_ALIGN;
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/*
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* Size of code: Subtract the size of the first sector (512 bytes)
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* which includes the header.
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*/
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put_unaligned_le32(file_sz - 512 + bss_sz, &buf[pe_header + 0x1c]);
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/* Size of image */
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put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);
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/*
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* Address of entry point for PE/COFF executable
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*/
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put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);
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update_pecoff_section_header_fields(".text", text_start, text_sz + bss_sz,
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text_sz, text_start);
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}
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static int reserve_pecoff_reloc_section(int c)
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{
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/* Reserve 0x20 bytes for .reloc section */
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memset(buf+c, 0, PECOFF_RELOC_RESERVE);
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return PECOFF_RELOC_RESERVE;
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}
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static void efi_stub_defaults(void)
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{
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/* Defaults for old kernel */
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#ifdef CONFIG_X86_32
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efi_pe_entry = 0x10;
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#else
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efi_pe_entry = 0x210;
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startup_64 = 0x200;
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#endif
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}
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static void efi_stub_entry_update(void)
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{
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unsigned long addr = efi32_stub_entry;
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#ifdef CONFIG_X86_64
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/* Yes, this is really how we defined it :( */
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addr = efi64_stub_entry - 0x200;
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#endif
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#ifdef CONFIG_EFI_MIXED
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if (efi32_stub_entry != addr)
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die("32-bit and 64-bit EFI entry points do not match\n");
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#endif
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put_unaligned_le32(addr, &buf[0x264]);
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}
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#else
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static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
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static inline void update_pecoff_text(unsigned int text_start,
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unsigned int file_sz,
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unsigned int init_sz) {}
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static inline void efi_stub_defaults(void) {}
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static inline void efi_stub_entry_update(void) {}
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static inline int reserve_pecoff_reloc_section(int c)
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{
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return 0;
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}
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#endif /* CONFIG_EFI_STUB */
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static int reserve_pecoff_compat_section(int c)
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{
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/* Reserve 0x20 bytes for .compat section */
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memset(buf+c, 0, PECOFF_COMPAT_RESERVE);
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return PECOFF_COMPAT_RESERVE;
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}
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/*
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* Parse zoffset.h and find the entry points. We could just #include zoffset.h
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* but that would mean tools/build would have to be rebuilt every time. It's
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* not as if parsing it is hard...
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*/
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#define PARSE_ZOFS(p, sym) do { \
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if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \
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sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \
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} while (0)
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static void parse_zoffset(char *fname)
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{
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FILE *file;
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char *p;
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int c;
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file = fopen(fname, "r");
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if (!file)
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die("Unable to open `%s': %m", fname);
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c = fread(buf, 1, sizeof(buf) - 1, file);
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if (ferror(file))
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die("read-error on `zoffset.h'");
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fclose(file);
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buf[c] = 0;
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p = (char *)buf;
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while (p && *p) {
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PARSE_ZOFS(p, efi32_stub_entry);
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PARSE_ZOFS(p, efi64_stub_entry);
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PARSE_ZOFS(p, efi_pe_entry);
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PARSE_ZOFS(p, efi32_pe_entry);
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PARSE_ZOFS(p, kernel_info);
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PARSE_ZOFS(p, startup_64);
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PARSE_ZOFS(p, _ehead);
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PARSE_ZOFS(p, _end);
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p = strchr(p, '\n');
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while (p && (*p == '\r' || *p == '\n'))
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p++;
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}
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}
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int main(int argc, char ** argv)
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{
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unsigned int i, sz, setup_sectors, init_sz;
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int c;
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u32 sys_size;
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struct stat sb;
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FILE *file, *dest;
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int fd;
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void *kernel;
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u32 crc = 0xffffffffUL;
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efi_stub_defaults();
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if (argc != 5)
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usage();
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parse_zoffset(argv[3]);
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dest = fopen(argv[4], "w");
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if (!dest)
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die("Unable to write `%s': %m", argv[4]);
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/* Copy the setup code */
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file = fopen(argv[1], "r");
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if (!file)
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die("Unable to open `%s': %m", argv[1]);
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c = fread(buf, 1, sizeof(buf), file);
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if (ferror(file))
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die("read-error on `setup'");
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if (c < 1024)
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die("The setup must be at least 1024 bytes");
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if (get_unaligned_le16(&buf[510]) != 0xAA55)
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die("Boot block hasn't got boot flag (0xAA55)");
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fclose(file);
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c += reserve_pecoff_compat_section(c);
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c += reserve_pecoff_reloc_section(c);
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/* Pad unused space with zeros */
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setup_sectors = (c + 511) / 512;
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if (setup_sectors < SETUP_SECT_MIN)
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setup_sectors = SETUP_SECT_MIN;
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i = setup_sectors*512;
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memset(buf+c, 0, i-c);
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update_pecoff_setup_and_reloc(i);
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/* Set the default root device */
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|
put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);
|
|
|
|
printf("Setup is %d bytes (padded to %d bytes).\n", c, i);
|
|
|
|
/* Open and stat the kernel file */
|
|
fd = open(argv[2], O_RDONLY);
|
|
if (fd < 0)
|
|
die("Unable to open `%s': %m", argv[2]);
|
|
if (fstat(fd, &sb))
|
|
die("Unable to stat `%s': %m", argv[2]);
|
|
sz = sb.st_size;
|
|
printf("System is %d kB\n", (sz+1023)/1024);
|
|
kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
|
|
if (kernel == MAP_FAILED)
|
|
die("Unable to mmap '%s': %m", argv[2]);
|
|
/* Number of 16-byte paragraphs, including space for a 4-byte CRC */
|
|
sys_size = (sz + 15 + 4) / 16;
|
|
#ifdef CONFIG_EFI_STUB
|
|
/*
|
|
* COFF requires minimum 32-byte alignment of sections, and
|
|
* adding a signature is problematic without that alignment.
|
|
*/
|
|
sys_size = (sys_size + 1) & ~1;
|
|
#endif
|
|
|
|
/* Patch the setup code with the appropriate size parameters */
|
|
buf[0x1f1] = setup_sectors-1;
|
|
put_unaligned_le32(sys_size, &buf[0x1f4]);
|
|
|
|
init_sz = get_unaligned_le32(&buf[0x260]);
|
|
#ifdef CONFIG_EFI_STUB
|
|
/*
|
|
* The decompression buffer will start at ImageBase. When relocating
|
|
* the compressed kernel to its end, we must ensure that the head
|
|
* section does not get overwritten. The head section occupies
|
|
* [i, i + _ehead), and the destination is [init_sz - _end, init_sz).
|
|
*
|
|
* At present these should never overlap, because 'i' is at most 32k
|
|
* because of SETUP_SECT_MAX, '_ehead' is less than 1k, and the
|
|
* calculation of INIT_SIZE in boot/header.S ensures that
|
|
* 'init_sz - _end' is at least 64k.
|
|
*
|
|
* For future-proofing, increase init_sz if necessary.
|
|
*/
|
|
|
|
if (init_sz - _end < i + _ehead) {
|
|
init_sz = (i + _ehead + _end + 4095) & ~4095;
|
|
put_unaligned_le32(init_sz, &buf[0x260]);
|
|
}
|
|
#endif
|
|
update_pecoff_text(setup_sectors * 512, i + (sys_size * 16), init_sz);
|
|
|
|
efi_stub_entry_update();
|
|
|
|
/* Update kernel_info offset. */
|
|
put_unaligned_le32(kernel_info, &buf[0x268]);
|
|
|
|
crc = partial_crc32(buf, i, crc);
|
|
if (fwrite(buf, 1, i, dest) != i)
|
|
die("Writing setup failed");
|
|
|
|
/* Copy the kernel code */
|
|
crc = partial_crc32(kernel, sz, crc);
|
|
if (fwrite(kernel, 1, sz, dest) != sz)
|
|
die("Writing kernel failed");
|
|
|
|
/* Add padding leaving 4 bytes for the checksum */
|
|
while (sz++ < (sys_size*16) - 4) {
|
|
crc = partial_crc32_one('\0', crc);
|
|
if (fwrite("\0", 1, 1, dest) != 1)
|
|
die("Writing padding failed");
|
|
}
|
|
|
|
/* Write the CRC */
|
|
printf("CRC %x\n", crc);
|
|
put_unaligned_le32(crc, buf);
|
|
if (fwrite(buf, 1, 4, dest) != 4)
|
|
die("Writing CRC failed");
|
|
|
|
/* Catch any delayed write failures */
|
|
if (fclose(dest))
|
|
die("Writing image failed");
|
|
|
|
close(fd);
|
|
|
|
/* Everything is OK */
|
|
return 0;
|
|
}
|