ref: c1d40df49550393f3afe53fb6e6d500dfa8eb7a8
dir: /sys/src/cmd/aux/aout2efi.c/
#include <u.h> #include <libc.h> #include <bio.h> #include <mach.h> #define HDRSZ 0x200 /* EFI header size */ enum { EFI_IMAGE_MACHINE_IA32 = 0x014c, EFI_IMAGE_MACHINE_x64 = 0x8664, EFI_IMAGE_MACHINE_AARCH64 = 0xAA64, }; static int is32; static int infd, outfd; static uchar buf[IOUNIT]; static void pack(uchar **pp, char *fmt, ...) { va_list args; int c; uchar *p; u32int u; u64int l; va_start(args, fmt); for(; *fmt; fmt++){ c = *fmt; if(c == 'q' && is32) c = 'l'; p = *pp; switch(c){ case 'b': p[0] = va_arg(args, int); *pp += 1; break; case 'w': u = va_arg(args, u32int); p[0] = u; p[1] = u>>8; *pp += 2; break; case 'l': u = va_arg(args, u32int); p[0] = u; p[1] = u>>8; p[2] = u>>16; p[3] = u>>24; *pp += 4; break; case 'q': l = va_arg(args, u64int); p[0] = l; p[1] = l>>8; p[2] = l>>16; p[3] = l>>24; p[4] = l>>32; p[5] = l>>40; p[6] = l>>48; p[7] = l>>56; *pp += 8; break; case '0': *pp += va_arg(args, int); break; default: sysfatal("pack: %c", c); } } va_end(args); } static void usage(void) { fprint(2, "usage: %s a.out\n", argv0); exits("usage"); } void main(int argc, char **argv) { Fhdr fhdr; u64int kzero; uchar *header; char *ofile, *iname; int arch, chars, relocs; long n, szofdat, szofimage; kzero = 0x8000; ofile = nil; relocs = 0; ARGBEGIN{ case 'Z': kzero = strtoull(EARGF(usage()), 0, 0); break; case 'o': ofile = strdup(EARGF(usage())); break; default: usage(); }ARGEND; if(argc != 1) usage(); infd = open(argv[0], OREAD); if(infd < 0) sysfatal("infd: %r"); if(crackhdr(infd, &fhdr) == 0) sysfatal("crackhdr: %r"); switch(mach->mtype){ case MI386: arch = EFI_IMAGE_MACHINE_IA32; is32 = 1; chars = 2103; break; case MAMD64: arch = EFI_IMAGE_MACHINE_x64; chars = 2223; break; case MARM64: arch = EFI_IMAGE_MACHINE_AARCH64; chars = 518; relocs = 1; break; default: SET(arch, chars); sysfatal("archloch"); } szofdat = fhdr.txtsz + fhdr.datsz; szofimage = szofdat + fhdr.bsssz + HDRSZ; iname = strrchr(argv[0], '/'); if(iname != nil) iname++; else iname = argv[0]; if(ofile == nil) ofile = smprint("%s.efi", iname); outfd = create(ofile, OWRITE|OTRUNC, 0666); if(outfd < 0) sysfatal("create: %r"); header = buf; /* mzhdr */ pack(&header, "bb0l", 'M', 'Z', /* e_magic */ 0x3a, /* UNUSED */ 0x40); /* e_lfanew */ /* pehdr */ pack(&header, "bbbbwwlllww", 'P', 'E', 0, 0, arch, /* Machine */ 1+relocs, /* NumberOfSections */ 0, /* TimeDateStamp UNUSED */ 0, /* PointerToSymbolTable UNUSED */ 0, /* NumberOfSymbols UNUSED */ is32 ? 0xE0 : 0xF0, /* SizeOfOptionalHeader */ chars); /* Characteristics */ pack(&header, "wbblllll", is32 ? 0x10B : 0x20B, /* Magic */ 9, /* MajorLinkerVersion UNUSED */ 0, /* MinorLinkerVersion UNUSED */ 0, /* SizeOfCode UNUSED */ 0, /* SizeOfInitializedData UNUSED */ 0, /* SizeOfUninitializedData UNUSED */ fhdr.entry-kzero, /* AddressOfEntryPoint */ 0); /* BaseOfCode UNUSED */ if(is32) pack(&header, "l", 0); /* BaseOfData UNUSED */ pack(&header, "qllwwwwwwllllwwqqqqll0", kzero, /* ImageBase */ HDRSZ, /* SectionAlignment */ HDRSZ, /* FileAlignment */ 4, /* MajorOperatingSystemVersion UNUSED */ 0, /* MinorOperatingSystemVersion UNUSED */ 0, /* MajorImageVersion UNUSED */ 0, /* MinorImageVersion UNUSED */ 4, /* MajorSubsystemVersion */ 0, /* MinorSubsystemVersion UNUSED */ 0, /* Win32VersionValue UNUSED */ szofimage, /* SizeOfImage */ HDRSZ, /* SizeOfHeaders */ 0, /* CheckSum UNUSED */ 10, /* Subsystem (10 = efi application) */ 0, /* DllCharacteristics UNUSED */ 0, /* SizeOfStackReserve UNUSED */ 0, /* SizeOfStackCommit UNUSED */ 0, /* SizeOfHeapReserve UNUSED */ 0, /* SizeOfHeapCommit UNUSED */ 0, /* LoaderFlags UNUSED */ 16, /* NumberOfRvaAndSizes UNUSED */ 32*4); /* RVA UNUSED */ if(relocs) pack(&header, "bbbbbbbbllllllwwl", '.', 'r', 'e', 'l', 'o', 'c', 0, 0, 0, /* VirtualSize */ 0, /* VirtualAddress */ 0, /* SizeOfData */ 0, /* PointerToRawData */ 0, /* PointerToRelocations UNUSED */ 0, /* PointerToLinenumbers UNUSED */ 0, /* NumberOfRelocations UNUSED */ 0, /* NumberOfLinenumbers UNUSED */ 0x42100040); /* Characteristics (read, discardable) */ pack(&header, "bbbbbbbbllllllwwl", '.', 't', 'e', 'x', 't', 0, 0, 0, szofdat, /* VirtualSize */ HDRSZ, /* VirtualAddress */ szofdat, /* SizeOfData */ HDRSZ, /* PointerToRawData */ 0, /* PointerToRelocations UNUSED */ 0, /* PointerToLinenumbers UNUSED */ 0, /* NumberOfRelocations UNUSED */ 0, /* NumberOfLinenumbers UNUSED */ 0x86000020); /* Characteristics (code, RWX) */ if(write(outfd, buf, HDRSZ) != HDRSZ) sysfatal("write: %r"); if(seek(infd, fhdr.hdrsz, 0) != fhdr.hdrsz) sysfatal("seek: %r"); for(;;){ n = read(infd, buf, sizeof(buf)); if(n < 0) sysfatal("read: %r"); if(n == 0) break; if(write(outfd, buf, n) != n) sysfatal("write: %r"); } exits(nil); }