| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * Copyright (C) 1997 Martin Mares |
| * Copyright (C) 2007 H. Peter Anvin |
| */ |
| |
| /* |
| * This file builds a disk-image from three different files: |
| * |
| * - setup: 8086 machine code, sets up system parm |
| * - system: 80386 code for actual system |
| * - zoffset.h: header with ZO_* defines |
| * |
| * It does some checking that all files are of the correct type, and writes |
| * the result to the specified destination, removing headers and padding to |
| * the right amount. It also writes some system data to stdout. |
| */ |
| |
| /* |
| * Changes by tytso to allow root device specification |
| * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 |
| * Cross compiling fixes by Gertjan van Wingerde, July 1996 |
| * Rewritten by Martin Mares, April 1997 |
| * Substantially overhauled by H. Peter Anvin, April 2007 |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #include <tools/le_byteshift.h> |
| |
| typedef unsigned char u8; |
| typedef unsigned short u16; |
| typedef unsigned int u32; |
| |
| #define DEFAULT_MAJOR_ROOT 0 |
| #define DEFAULT_MINOR_ROOT 0 |
| #define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT) |
| |
| /* Minimal number of setup sectors */ |
| #define SETUP_SECT_MIN 5 |
| #define SETUP_SECT_MAX 64 |
| |
| /* This must be large enough to hold the entire setup */ |
| u8 buf[SETUP_SECT_MAX*512]; |
| |
| #define PECOFF_RELOC_RESERVE 0x20 |
| |
| unsigned long efi32_stub_entry; |
| unsigned long efi64_stub_entry; |
| unsigned long efi_pe_entry; |
| unsigned long startup_64; |
| |
| /*----------------------------------------------------------------------*/ |
| |
| static const u32 crctab32[] = { |
| 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, |
| 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, |
| 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, |
| 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
| 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, |
| 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, |
| 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, |
| 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
| 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, |
| 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, |
| 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, |
| 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
| 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, |
| 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, |
| 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, |
| 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
| 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, |
| 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, |
| 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, |
| 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
| 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, |
| 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, |
| 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, |
| 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
| 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, |
| 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, |
| 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, |
| 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
| 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, |
| 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, |
| 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, |
| 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
| 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, |
| 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, |
| 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, |
| 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
| 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, |
| 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, |
| 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, |
| 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
| 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, |
| 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, |
| 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, |
| 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
| 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, |
| 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, |
| 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, |
| 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
| 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, |
| 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, |
| 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, |
| 0x2d02ef8d |
| }; |
| |
| static u32 partial_crc32_one(u8 c, u32 crc) |
| { |
| return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); |
| } |
| |
| static u32 partial_crc32(const u8 *s, int len, u32 crc) |
| { |
| while (len--) |
| crc = partial_crc32_one(*s++, crc); |
| return crc; |
| } |
| |
| static void die(const char * str, ...) |
| { |
| va_list args; |
| va_start(args, str); |
| vfprintf(stderr, str, args); |
| va_end(args); |
| fputc('\n', stderr); |
| exit(1); |
| } |
| |
| static void usage(void) |
| { |
| die("Usage: build setup system zoffset.h image"); |
| } |
| |
| #ifdef CONFIG_EFI_STUB |
| |
| static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset) |
| { |
| unsigned int pe_header; |
| unsigned short num_sections; |
| u8 *section; |
| |
| pe_header = get_unaligned_le32(&buf[0x3c]); |
| num_sections = get_unaligned_le16(&buf[pe_header + 6]); |
| |
| #ifdef CONFIG_X86_32 |
| section = &buf[pe_header + 0xa8]; |
| #else |
| section = &buf[pe_header + 0xb8]; |
| #endif |
| |
| while (num_sections > 0) { |
| if (strncmp((char*)section, section_name, 8) == 0) { |
| /* section header size field */ |
| put_unaligned_le32(size, section + 0x8); |
| |
| /* section header vma field */ |
| put_unaligned_le32(vma, section + 0xc); |
| |
| /* section header 'size of initialised data' field */ |
| put_unaligned_le32(datasz, section + 0x10); |
| |
| /* section header 'file offset' field */ |
| put_unaligned_le32(offset, section + 0x14); |
| |
| break; |
| } |
| section += 0x28; |
| num_sections--; |
| } |
| } |
| |
| static void update_pecoff_section_header(char *section_name, u32 offset, u32 size) |
| { |
| update_pecoff_section_header_fields(section_name, offset, size, size, offset); |
| } |
| |
| static void update_pecoff_setup_and_reloc(unsigned int size) |
| { |
| u32 setup_offset = 0x200; |
| u32 reloc_offset = size - PECOFF_RELOC_RESERVE; |
| u32 setup_size = reloc_offset - setup_offset; |
| |
| update_pecoff_section_header(".setup", setup_offset, setup_size); |
| update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE); |
| |
| /* |
| * Modify .reloc section contents with a single entry. The |
| * relocation is applied to offset 10 of the relocation section. |
| */ |
| put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]); |
| put_unaligned_le32(10, &buf[reloc_offset + 4]); |
| } |
| |
| static void update_pecoff_text(unsigned int text_start, unsigned int file_sz) |
| { |
| unsigned int pe_header; |
| unsigned int text_sz = file_sz - text_start; |
| |
| pe_header = get_unaligned_le32(&buf[0x3c]); |
| |
| /* |
| * Size of code: Subtract the size of the first sector (512 bytes) |
| * which includes the header. |
| */ |
| put_unaligned_le32(file_sz - 512, &buf[pe_header + 0x1c]); |
| |
| /* |
| * Address of entry point for PE/COFF executable |
| */ |
| put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]); |
| |
| update_pecoff_section_header(".text", text_start, text_sz); |
| } |
| |
| static void update_pecoff_bss(unsigned int file_sz, unsigned int init_sz) |
| { |
| unsigned int pe_header; |
| unsigned int bss_sz = init_sz - file_sz; |
| |
| pe_header = get_unaligned_le32(&buf[0x3c]); |
| |
| /* Size of uninitialized data */ |
| put_unaligned_le32(bss_sz, &buf[pe_header + 0x24]); |
| |
| /* Size of image */ |
| put_unaligned_le32(init_sz, &buf[pe_header + 0x50]); |
| |
| update_pecoff_section_header_fields(".bss", file_sz, bss_sz, 0, 0); |
| } |
| |
| static int reserve_pecoff_reloc_section(int c) |
| { |
| /* Reserve 0x20 bytes for .reloc section */ |
| memset(buf+c, 0, PECOFF_RELOC_RESERVE); |
| return PECOFF_RELOC_RESERVE; |
| } |
| |
| static void efi_stub_defaults(void) |
| { |
| /* Defaults for old kernel */ |
| #ifdef CONFIG_X86_32 |
| efi_pe_entry = 0x10; |
| #else |
| efi_pe_entry = 0x210; |
| startup_64 = 0x200; |
| #endif |
| } |
| |
| static void efi_stub_entry_update(void) |
| { |
| unsigned long addr = efi32_stub_entry; |
| |
| #ifdef CONFIG_X86_64 |
| /* Yes, this is really how we defined it :( */ |
| addr = efi64_stub_entry - 0x200; |
| #endif |
| |
| #ifdef CONFIG_EFI_MIXED |
| if (efi32_stub_entry != addr) |
| die("32-bit and 64-bit EFI entry points do not match\n"); |
| #endif |
| put_unaligned_le32(addr, &buf[0x264]); |
| } |
| |
| #else |
| |
| static inline void update_pecoff_setup_and_reloc(unsigned int size) {} |
| static inline void update_pecoff_text(unsigned int text_start, |
| unsigned int file_sz) {} |
| static inline void update_pecoff_bss(unsigned int file_sz, |
| unsigned int init_sz) {} |
| static inline void efi_stub_defaults(void) {} |
| static inline void efi_stub_entry_update(void) {} |
| |
| static inline int reserve_pecoff_reloc_section(int c) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_EFI_STUB */ |
| |
| |
| /* |
| * Parse zoffset.h and find the entry points. We could just #include zoffset.h |
| * but that would mean tools/build would have to be rebuilt every time. It's |
| * not as if parsing it is hard... |
| */ |
| #define PARSE_ZOFS(p, sym) do { \ |
| if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym))) \ |
| sym = strtoul(p + 11 + sizeof(#sym), NULL, 16); \ |
| } while (0) |
| |
| static void parse_zoffset(char *fname) |
| { |
| FILE *file; |
| char *p; |
| int c; |
| |
| file = fopen(fname, "r"); |
| if (!file) |
| die("Unable to open `%s': %m", fname); |
| c = fread(buf, 1, sizeof(buf) - 1, file); |
| if (ferror(file)) |
| die("read-error on `zoffset.h'"); |
| fclose(file); |
| buf[c] = 0; |
| |
| p = (char *)buf; |
| |
| while (p && *p) { |
| PARSE_ZOFS(p, efi32_stub_entry); |
| PARSE_ZOFS(p, efi64_stub_entry); |
| PARSE_ZOFS(p, efi_pe_entry); |
| PARSE_ZOFS(p, startup_64); |
| |
| p = strchr(p, '\n'); |
| while (p && (*p == '\r' || *p == '\n')) |
| p++; |
| } |
| } |
| |
| int main(int argc, char ** argv) |
| { |
| unsigned int i, sz, setup_sectors, init_sz; |
| int c; |
| u32 sys_size; |
| struct stat sb; |
| FILE *file, *dest; |
| int fd; |
| void *kernel; |
| u32 crc = 0xffffffffUL; |
| |
| efi_stub_defaults(); |
| |
| if (argc != 5) |
| usage(); |
| parse_zoffset(argv[3]); |
| |
| dest = fopen(argv[4], "w"); |
| if (!dest) |
| die("Unable to write `%s': %m", argv[4]); |
| |
| /* Copy the setup code */ |
| file = fopen(argv[1], "r"); |
| if (!file) |
| die("Unable to open `%s': %m", argv[1]); |
| c = fread(buf, 1, sizeof(buf), file); |
| if (ferror(file)) |
| die("read-error on `setup'"); |
| if (c < 1024) |
| die("The setup must be at least 1024 bytes"); |
| if (get_unaligned_le16(&buf[510]) != 0xAA55) |
| die("Boot block hasn't got boot flag (0xAA55)"); |
| fclose(file); |
| |
| c += reserve_pecoff_reloc_section(c); |
| |
| /* Pad unused space with zeros */ |
| setup_sectors = (c + 511) / 512; |
| if (setup_sectors < SETUP_SECT_MIN) |
| setup_sectors = SETUP_SECT_MIN; |
| i = setup_sectors*512; |
| memset(buf+c, 0, i-c); |
| |
| update_pecoff_setup_and_reloc(i); |
| |
| /* Set the default root device */ |
| 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]); |
| |
| update_pecoff_text(setup_sectors * 512, i + (sys_size * 16)); |
| init_sz = get_unaligned_le32(&buf[0x260]); |
| update_pecoff_bss(i + (sys_size * 16), init_sz); |
| |
| efi_stub_entry_update(); |
| |
| 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; |
| } |