ref: 6ca8e6bbafcc871301a90aa7bd4ca10533b1999a
dir: /sys/src/cmd/aux/aout2uimage.c/
#include <u.h> #include <libc.h> #include <bio.h> #include <mach.h> #include <flate.h> int infd, outfd; ulong dcrc; ulong *tab; uchar buf[65536]; enum { IH_ARCH_INVALID = 0, IH_ARCH_ALPHA, IH_ARCH_ARM, IH_ARCH_I386, IH_ARCH_IA64, IH_ARCH_MIPS, IH_ARCH_MIPS64, IH_ARCH_PPC, IH_ARCH_S390, IH_ARCH_SH, IH_ARCH_SPARC, IH_ARCH_SPARC64, IH_ARCH_M68K, IH_ARCH_NIOS, IH_ARCH_MICROBLAZE, IH_ARCH_NIOS2, IH_ARCH_BLACKFIN, IH_ARCH_AVR32, IH_ARCH_ST200, IH_ARCH_SANDBOX, IH_ARCH_NDS32, IH_ARCH_OPENRISC, IH_ARCH_ARM64, IH_ARCH_ARC, IH_ARCH_X86_64, IH_ARCH_XTENSA, IH_ARCH_RISCV, }; uchar archtab[] = { [MMIPS] IH_ARCH_MIPS, [MSPARC] IH_ARCH_SPARC, [MI386] IH_ARCH_I386, [MMIPS2] IH_ARCH_MIPS, [NMIPS2] IH_ARCH_MIPS, [MARM] IH_ARCH_ARM, [MPOWER] IH_ARCH_PPC, [MALPHA] IH_ARCH_ALPHA, [NMIPS] IH_ARCH_MIPS, [MSPARC64] IH_ARCH_SPARC64, [MAMD64] IH_ARCH_X86_64, [MPOWER64] IH_ARCH_PPC, [MARM64] IH_ARCH_ARM64, }; void put(uchar *p, u32int v) { *p++ = v >> 24; *p++ = v >> 16; *p++ = v >> 8; *p = v; } void usage(void) { fprint(2, "usage: %s a.out\n", argv0); exits("usage"); } void block(int n) { int rc; rc = readn(infd, buf, n); if(rc < 0) sysfatal("read: %r"); if(rc < n) sysfatal("input file truncated"); if(write(outfd, buf, n) < 0) sysfatal("write error"); dcrc = blockcrc(tab, dcrc, buf, n); } void copy(int n) { int i; for(i = sizeof(buf) - 1; i < n; i += sizeof(buf)) block(sizeof(buf)); i = n & sizeof(buf) - 1; if(i > 0) block(i); } void main(int argc, char **argv) { Fhdr fhdr; u64int kzero; ulong rtext; uchar header[64]; char *ofile, *iname; int arch; kzero = 0xF0000000; ofile = nil; 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"); if((uint)mach->mtype >= nelem(archtab) || archtab[mach->mtype] == 0) sysfatal("archloch"); arch = archtab[mach->mtype]; assert(sizeof(buf) >= mach->pgsize); iname = strrchr(argv[0], '/'); if(iname != nil) iname++; else iname = argv[0]; if(ofile == nil) ofile = smprint("%s.u", iname); outfd = create(ofile, OWRITE|OTRUNC, 0666); if(outfd < 0) sysfatal("create: %r"); tab = mkcrctab(0xEDB88320); seek(infd, fhdr.hdrsz, 0); /* a.out header not part of the image */ seek(outfd, sizeof(header), 0); dcrc = 0; copy(fhdr.txtsz); /* round text out to page boundary (see rebootcmd()) */ rtext = ((fhdr.entry + fhdr.txtsz + mach->pgsize-1) & -mach->pgsize) - fhdr.entry; if(rtext > fhdr.txtsz){ memset(buf, 0, rtext - fhdr.txtsz); if(write(outfd, buf, rtext - fhdr.txtsz) < 0) sysfatal("write: %r"); dcrc = blockcrc(tab, dcrc, buf, rtext - fhdr.txtsz); } copy(fhdr.datsz); memset(header, 0, sizeof(header)); put(&header[0], 0x27051956); /* magic */ put(&header[8], time(0)); /* time */ put(&header[12], rtext + fhdr.datsz); /* image size */ put(&header[16], fhdr.txtaddr - kzero); /* load address */ put(&header[20], fhdr.entry - kzero); /* entry point */ put(&header[24], dcrc); /* data crc */ header[28] = 23; /* os = plan 9 */ header[29] = arch; header[30] = 2; /* type = kernel */ header[31] = 0; /* compressed = no */ strncpy((char*)&header[32], iname, sizeof(header)-32); put(&header[4], blockcrc(tab, 0, header, sizeof(header))); seek(outfd, 0, 0); if(write(outfd, header, sizeof(header)) < sizeof(header)) sysfatal("write: %r"); exits(nil); }