func main() { log.SetFlags(0) log.SetPrefix("asm: ") GOARCH := obj.Getgoarch() architecture := arch.Set(GOARCH) if architecture == nil { log.Fatalf("asm: unrecognized architecture %s", GOARCH) } flags.Parse() // Create object file, write header. fd, err := os.Create(*flags.OutputFile) if err != nil { log.Fatal(err) } ctxt := obj.Linknew(architecture.LinkArch) if *flags.PrintOut { ctxt.Debugasm = 1 } ctxt.LineHist.TrimPathPrefix = *flags.TrimPath ctxt.Flag_dynlink = *flags.Dynlink if *flags.Shared || *flags.Dynlink { ctxt.Flag_shared = 1 } ctxt.Bso = obj.Binitw(os.Stdout) defer ctxt.Bso.Flush() output := obj.Binitw(fd) fmt.Fprintf(output, "go object %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion()) fmt.Fprintf(output, "!\n") lexer := lex.NewLexer(flag.Arg(0), ctxt) parser := asm.NewParser(ctxt, architecture, lexer) diag := false ctxt.DiagFunc = func(format string, args ...interface{}) { diag = true log.Printf(format, args...) } pList := obj.Linknewplist(ctxt) var ok bool pList.Firstpc, ok = parser.Parse() if ok { // reports errors to parser.Errorf obj.Writeobjdirect(ctxt, output) } if !ok || diag { log.Printf("asm: assembly of %s failed", flag.Arg(0)) os.Remove(*flags.OutputFile) os.Exit(1) } output.Flush() }
} // zero old range p = zerorange(p, int64(frame), lo, hi) // set new range hi = n.Xoffset + n.Type.Width lo = n.Xoffset } // zero final range zerorange(p, int64(frame), lo, hi) } var darwin = obj.Getgoos() == "darwin" func zerorange(p *obj.Prog, frame int64, lo int64, hi int64) *obj.Prog { cnt := hi - lo if cnt == 0 { return p } if cnt < int64(4*gc.Widthptr) { for i := int64(0); i < cnt; i += int64(gc.Widthptr) { p = appendpp(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+frame+lo+i) } } else if cnt <= int64(128*gc.Widthptr) && !darwin { // darwin ld64 cannot handle BR26 reloc with non-zero addend p = appendpp(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REGRT1, 0) p = appendpp(p, arm64.AADD, obj.TYPE_CONST, 0, 8+frame+lo-8, obj.TYPE_REG, arm64.REGRT1, 0) p.Reg = arm64.REGRT1 p = appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
func Main() { if obj.Getgoos() == "nacl" { resvd = append(resvd, x86.REG_BP, x86.REG_R15) } else if obj.Framepointer_enabled != 0 { resvd = append(resvd, x86.REG_BP) } gc.Thearch.Thechar = thechar gc.Thearch.Thestring = thestring gc.Thearch.Thelinkarch = thelinkarch gc.Thearch.Typedefs = typedefs gc.Thearch.REGSP = x86.REGSP gc.Thearch.REGCTXT = x86.REGCTXT gc.Thearch.REGCALLX = x86.REG_BX gc.Thearch.REGCALLX2 = x86.REG_AX gc.Thearch.REGRETURN = x86.REG_AX gc.Thearch.REGMIN = x86.REG_AX gc.Thearch.REGMAX = x86.REG_R15 gc.Thearch.FREGMIN = x86.REG_X0 gc.Thearch.FREGMAX = x86.REG_X15 gc.Thearch.MAXWIDTH = MAXWIDTH gc.Thearch.ReservedRegs = resvd gc.Thearch.AddIndex = addindex gc.Thearch.Betypeinit = betypeinit gc.Thearch.Cgen_bmul = cgen_bmul gc.Thearch.Cgen_hmul = cgen_hmul gc.Thearch.Cgen_shift = cgen_shift gc.Thearch.Clearfat = clearfat gc.Thearch.Defframe = defframe gc.Thearch.Dodiv = dodiv gc.Thearch.Excise = excise gc.Thearch.Expandchecks = expandchecks gc.Thearch.Getg = getg gc.Thearch.Gins = gins gc.Thearch.Ginsboolval = ginsboolval gc.Thearch.Ginscmp = ginscmp gc.Thearch.Ginscon = ginscon gc.Thearch.Ginsnop = ginsnop gc.Thearch.Gmove = gmove gc.Thearch.Linkarchinit = linkarchinit gc.Thearch.Peep = peep gc.Thearch.Proginfo = proginfo gc.Thearch.Regtyp = regtyp gc.Thearch.Sameaddr = sameaddr gc.Thearch.Smallindir = smallindir gc.Thearch.Stackaddr = stackaddr gc.Thearch.Blockcopy = blockcopy gc.Thearch.Sudoaddable = sudoaddable gc.Thearch.Sudoclean = sudoclean gc.Thearch.Excludedregs = excludedregs gc.Thearch.RtoB = RtoB gc.Thearch.FtoB = FtoB gc.Thearch.BtoR = BtoR gc.Thearch.BtoF = BtoF gc.Thearch.Optoas = optoas gc.Thearch.Doregbits = doregbits gc.Thearch.Regnames = regnames gc.Main() gc.Exit(0) }
func linknew(arch *LinkArch) *Link { ctxt := new(Link) ctxt.Hash = make(map[symVer]*LSym) ctxt.Arch = arch ctxt.Version = obj.HistVersion ctxt.Goroot = obj.Getgoroot() p := obj.Getgoarch() if p != arch.Name { log.Fatalf("invalid goarch %s (want %s)", p, arch.Name) } var buf string buf, _ = os.Getwd() if buf == "" { buf = "/???" } buf = filepath.ToSlash(buf) ctxt.Headtype = headtype(obj.Getgoos()) if ctxt.Headtype < 0 { log.Fatalf("unknown goos %s", obj.Getgoos()) } // Record thread-local storage offset. // TODO(rsc): Move tlsoffset back into the linker. switch ctxt.Headtype { default: log.Fatalf("unknown thread-local storage offset for %s", Headstr(ctxt.Headtype)) case obj.Hplan9, obj.Hwindows: break /* * ELF uses TLS offset negative from FS. * Translate 0(FS) and 8(FS) into -16(FS) and -8(FS). * Known to low-level assembly in package runtime and runtime/cgo. */ case obj.Hlinux, obj.Hfreebsd, obj.Hnetbsd, obj.Hopenbsd, obj.Hdragonfly, obj.Hsolaris: if obj.Getgoos() == "android" { switch ctxt.Arch.Thechar { case '6': // Android/amd64 constant - offset from 0(FS) to our TLS slot. // Explained in src/runtime/cgo/gcc_android_*.c ctxt.Tlsoffset = 0x1d0 case '8': // Android/386 constant - offset from 0(GS) to our TLS slot. ctxt.Tlsoffset = 0xf8 default: ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize } } else { ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize } case obj.Hnacl: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for nacl/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 case '6': ctxt.Tlsoffset = 0 case '8': ctxt.Tlsoffset = -8 } /* * OS X system constants - offset from 0(GS) to our TLS. * Explained in src/runtime/cgo/gcc_darwin_*.c. */ case obj.Hdarwin: switch ctxt.Arch.Thechar { default: log.Fatalf("unknown thread-local storage offset for darwin/%s", ctxt.Arch.Name) case '5': ctxt.Tlsoffset = 0 // dummy value, not needed case '6': ctxt.Tlsoffset = 0x8a0 case '7': ctxt.Tlsoffset = 0 // dummy value, not needed case '8': ctxt.Tlsoffset = 0x468 } } // On arm, record goarm. if ctxt.Arch.Thechar == '5' { ctxt.Goarm = obj.Getgoarm() } return ctxt }
func dumpobj() { var err error bout, err = obj.Bopenw(outfile) if err != nil { Flusherrors() fmt.Printf("can't create %s: %v\n", outfile, err) errorexit() } startobj := int64(0) var arhdr [ArhdrSize]byte if writearchive != 0 { obj.Bwritestring(bout, "!<arch>\n") arhdr = [ArhdrSize]byte{} bout.Write(arhdr[:]) startobj = obj.Boffset(bout) } fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring()) dumpexport() if writearchive != 0 { bout.Flush() size := obj.Boffset(bout) - startobj if size&1 != 0 { obj.Bputc(bout, 0) } obj.Bseek(bout, startobj-ArhdrSize, 0) formathdr(arhdr[:], "__.PKGDEF", size) bout.Write(arhdr[:]) bout.Flush() obj.Bseek(bout, startobj+size+(size&1), 0) arhdr = [ArhdrSize]byte{} bout.Write(arhdr[:]) startobj = obj.Boffset(bout) fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring()) } if pragcgobuf != "" { if writearchive != 0 { // write empty export section; must be before cgo section fmt.Fprintf(bout, "\n$$\n\n$$\n\n") } fmt.Fprintf(bout, "\n$$ // cgo\n") fmt.Fprintf(bout, "%s\n$$\n\n", pragcgobuf) } fmt.Fprintf(bout, "\n!\n") externs := len(externdcl) dumpglobls() dumptypestructs() // Dump extra globals. tmp := externdcl if externdcl != nil { externdcl = externdcl[externs:] } dumpglobls() externdcl = tmp dumpdata() obj.Writeobjdirect(Ctxt, bout) if writearchive != 0 { bout.Flush() size := obj.Boffset(bout) - startobj if size&1 != 0 { obj.Bputc(bout, 0) } obj.Bseek(bout, startobj-ArhdrSize, 0) formathdr(arhdr[:], "_go_.o", size) bout.Write(arhdr[:]) } obj.Bterm(bout) }
func Ldmain() { Ctxt = linknew(Thelinkarch) Ctxt.Thechar = int32(Thearch.Thechar) Ctxt.Thestring = Thestring Ctxt.Diag = Diag Ctxt.Bso = &Bso Bso = *obj.Binitw(os.Stdout) Debug = [128]int{} nerrors = 0 outfile = "" HEADTYPE = -1 INITTEXT = -1 INITDAT = -1 INITRND = -1 INITENTRY = "" Linkmode = LinkAuto // For testing behavior of go command when tools crash silently. // Undocumented, not in standard flag parser to avoid // exposing in usage message. for _, arg := range os.Args { if arg == "-crash_for_testing" { os.Exit(2) } } if Thearch.Thechar == '6' && obj.Getgoos() == "plan9" { obj.Flagcount("8", "use 64-bit addresses in symbol table", &Debug['8']) } obj.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF", addbuildinfo) obj.Flagcount("C", "check Go calls to C code", &Debug['C']) obj.Flagint64("D", "set data segment `address`", &INITDAT) obj.Flagstr("E", "set `entry` symbol name", &INITENTRY) obj.Flagfn1("I", "use `linker` as ELF dynamic linker", setinterp) obj.Flagfn1("L", "add specified `directory` to library path", Lflag) obj.Flagfn1("H", "set header `type`", setheadtype) obj.Flagint32("R", "set address rounding `quantum`", &INITRND) obj.Flagint64("T", "set text segment `address`", &INITTEXT) obj.Flagfn0("V", "print version and exit", doversion) obj.Flagfn1("X", "add string value `definition` of the form importpath.name=value", addstrdata1) obj.Flagcount("a", "disassemble output", &Debug['a']) obj.Flagstr("buildid", "record `id` as Go toolchain build id", &buildid) flag.Var(&Buildmode, "buildmode", "set build `mode`") obj.Flagcount("c", "dump call graph", &Debug['c']) obj.Flagcount("d", "disable dynamic executable", &Debug['d']) obj.Flagstr("extar", "archive program for buildmode=c-archive", &extar) obj.Flagstr("extld", "use `linker` when linking in external mode", &extld) obj.Flagstr("extldflags", "pass `flags` to external linker", &extldflags) obj.Flagcount("f", "ignore version mismatch", &Debug['f']) obj.Flagcount("g", "disable go package data checks", &Debug['g']) obj.Flagcount("h", "halt on error", &Debug['h']) obj.Flagstr("installsuffix", "set package directory `suffix`", &flag_installsuffix) obj.Flagstr("k", "set field tracking `symbol`", &tracksym) obj.Flagstr("libgcc", "compiler support lib for internal linking; use \"none\" to disable", &libgccfile) obj.Flagfn1("linkmode", "set link `mode` (internal, external, auto)", setlinkmode) flag.BoolVar(&Linkshared, "linkshared", false, "link against installed Go shared libraries") obj.Flagcount("msan", "enable MSan interface", &flag_msan) obj.Flagcount("n", "dump symbol table", &Debug['n']) obj.Flagstr("o", "write output to `file`", &outfile) flag.Var(&rpath, "r", "set the ELF dynamic linker search `path` to dir1:dir2:...") obj.Flagcount("race", "enable race detector", &flag_race) obj.Flagcount("s", "disable symbol table", &Debug['s']) var flagShared int if Thearch.Thechar == '5' || Thearch.Thechar == '6' { obj.Flagcount("shared", "generate shared object (implies -linkmode external)", &flagShared) } obj.Flagstr("tmpdir", "use `directory` for temporary files", &tmpdir) obj.Flagcount("u", "reject unsafe packages", &Debug['u']) obj.Flagcount("v", "print link trace", &Debug['v']) obj.Flagcount("w", "disable DWARF generation", &Debug['w']) obj.Flagstr("cpuprofile", "write cpu profile to `file`", &cpuprofile) obj.Flagstr("memprofile", "write memory profile to `file`", &memprofile) obj.Flagint64("memprofilerate", "set runtime.MemProfileRate to `rate`", &memprofilerate) // Clumsy hack to preserve old two-argument -X name val syntax for old scripts. // Rewrite that syntax into new syntax -X name=val. // TODO(rsc): Delete this hack in Go 1.6 or later. var args []string for i := 0; i < len(os.Args); i++ { arg := os.Args[i] if (arg == "-X" || arg == "--X") && i+2 < len(os.Args) && !strings.Contains(os.Args[i+1], "=") { fmt.Fprintf(os.Stderr, "link: warning: option %s %s %s may not work in future releases; use %s %s=%s\n", arg, os.Args[i+1], os.Args[i+2], arg, os.Args[i+1], os.Args[i+2]) args = append(args, arg) args = append(args, os.Args[i+1]+"="+os.Args[i+2]) i += 2 continue } if (strings.HasPrefix(arg, "-X=") || strings.HasPrefix(arg, "--X=")) && i+1 < len(os.Args) && strings.Count(arg, "=") == 1 { fmt.Fprintf(os.Stderr, "link: warning: option %s %s may not work in future releases; use %s=%s\n", arg, os.Args[i+1], arg, os.Args[i+1]) args = append(args, arg+"="+os.Args[i+1]) i++ continue } args = append(args, arg) } os.Args = args obj.Flagparse(usage) startProfile() Ctxt.Bso = &Bso Ctxt.Debugvlog = int32(Debug['v']) if flagShared != 0 { if Buildmode == BuildmodeUnset { Buildmode = BuildmodeCShared } else if Buildmode != BuildmodeCShared { Exitf("-shared and -buildmode=%s are incompatible", Buildmode.String()) } } if Buildmode == BuildmodeUnset { Buildmode = BuildmodeExe } if Buildmode != BuildmodeShared && flag.NArg() != 1 { usage() } if outfile == "" { outfile = "a.out" if HEADTYPE == obj.Hwindows { outfile += ".exe" } } libinit() // creates outfile if HEADTYPE == -1 { HEADTYPE = int32(headtype(goos)) } Ctxt.Headtype = int(HEADTYPE) if headstring == "" { headstring = Headstr(int(HEADTYPE)) } Thearch.Archinit() if Linkshared && !Iself { Exitf("-linkshared can only be used on elf systems") } if Debug['v'] != 0 { fmt.Fprintf(&Bso, "HEADER = -H%d -T0x%x -D0x%x -R0x%x\n", HEADTYPE, uint64(INITTEXT), uint64(INITDAT), uint32(INITRND)) } Bso.Flush() if Buildmode == BuildmodeShared { for i := 0; i < flag.NArg(); i++ { arg := flag.Arg(i) parts := strings.SplitN(arg, "=", 2) var pkgpath, file string if len(parts) == 1 { pkgpath, file = "main", arg } else { pkgpath, file = parts[0], parts[1] } pkglistfornote = append(pkglistfornote, pkgpath...) pkglistfornote = append(pkglistfornote, '\n') addlibpath(Ctxt, "command line", "command line", file, pkgpath, "") } } else { addlibpath(Ctxt, "command line", "command line", flag.Arg(0), "main", "") } loadlib() if Thearch.Thechar == '5' { // mark some functions that are only referenced after linker code editing if Ctxt.Goarm == 5 { mark(Linkrlookup(Ctxt, "_sfloat", 0)) } mark(Linklookup(Ctxt, "runtime.read_tls_fallback", 0)) } checkgo() checkstrdata() deadcode() callgraph() doelf() if HEADTYPE == obj.Hdarwin { domacho() } dostkcheck() if HEADTYPE == obj.Hwindows { dope() } addexport() Thearch.Gentext() // trampolines, call stubs, etc. textbuildid() textaddress() pclntab() findfunctab() symtab() dodata() address() doweak() reloc() Thearch.Asmb() undef() hostlink() archive() if Debug['v'] != 0 { fmt.Fprintf(&Bso, "%5.2f cpu time\n", obj.Cputime()) fmt.Fprintf(&Bso, "%d symbols\n", Ctxt.Nsymbol) fmt.Fprintf(&Bso, "%d liveness data\n", liveness) } Bso.Flush() errorexit() }
func blockcopy(n, ns *gc.Node, osrc, odst, w int64) { var noddi gc.Node gc.Nodreg(&noddi, gc.Types[gc.Tptr], x86.REG_DI) var nodsi gc.Node gc.Nodreg(&nodsi, gc.Types[gc.Tptr], x86.REG_SI) var nodl gc.Node var nodr gc.Node if n.Ullman >= ns.Ullman { gc.Agenr(n, &nodr, &nodsi) if ns.Op == gc.ONAME { gc.Gvardef(ns) } gc.Agenr(ns, &nodl, &noddi) } else { if ns.Op == gc.ONAME { gc.Gvardef(ns) } gc.Agenr(ns, &nodl, &noddi) gc.Agenr(n, &nodr, &nodsi) } if nodl.Reg != x86.REG_DI { gmove(&nodl, &noddi) } if nodr.Reg != x86.REG_SI { gmove(&nodr, &nodsi) } gc.Regfree(&nodl) gc.Regfree(&nodr) c := w % 8 // bytes q := w / 8 // quads var oldcx gc.Node var cx gc.Node savex(x86.REG_CX, &cx, &oldcx, nil, gc.Types[gc.TINT64]) // if we are copying forward on the stack and // the src and dst overlap, then reverse direction if osrc < odst && odst < osrc+w { // reverse direction gins(x86.ASTD, nil, nil) // set direction flag if c > 0 { gconreg(addptr, w-1, x86.REG_SI) gconreg(addptr, w-1, x86.REG_DI) gconreg(movptr, c, x86.REG_CX) gins(x86.AREP, nil, nil) // repeat gins(x86.AMOVSB, nil, nil) // MOVB *(SI)-,*(DI)- } if q > 0 { if c > 0 { gconreg(addptr, -7, x86.REG_SI) gconreg(addptr, -7, x86.REG_DI) } else { gconreg(addptr, w-8, x86.REG_SI) gconreg(addptr, w-8, x86.REG_DI) } gconreg(movptr, q, x86.REG_CX) gins(x86.AREP, nil, nil) // repeat gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)-,*(DI)- } // we leave with the flag clear gins(x86.ACLD, nil, nil) } else { // normal direction if q > 128 || (gc.Nacl && q >= 4) || (obj.Getgoos() == "plan9" && q >= 4) { gconreg(movptr, q, x86.REG_CX) gins(x86.AREP, nil, nil) // repeat gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+ } else if q >= 4 { var oldx0 gc.Node var x0 gc.Node savex(x86.REG_X0, &x0, &oldx0, nil, gc.Types[gc.TFLOAT64]) p := gins(obj.ADUFFCOPY, nil, nil) p.To.Type = obj.TYPE_ADDR p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg)) // 64 blocks taking 14 bytes each // see ../../../../runtime/mkduff.go p.To.Offset = 14 * (64 - q/2) restx(&x0, &oldx0) if q%2 != 0 { gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+ } } else if !gc.Nacl && c == 0 { // We don't need the MOVSQ side-effect of updating SI and DI, // and issuing a sequence of MOVQs directly is faster. nodsi.Op = gc.OINDREG noddi.Op = gc.OINDREG for q > 0 { gmove(&nodsi, &cx) // MOVQ x+(SI),CX gmove(&cx, &noddi) // MOVQ CX,x+(DI) nodsi.Xoffset += 8 noddi.Xoffset += 8 q-- } } else { for q > 0 { gins(x86.AMOVSQ, nil, nil) // MOVQ *(SI)+,*(DI)+ q-- } } // copy the remaining c bytes if w < 4 || c <= 1 || (odst < osrc && osrc < odst+w) { for c > 0 { gins(x86.AMOVSB, nil, nil) // MOVB *(SI)+,*(DI)+ c-- } } else if w < 8 || c <= 4 { nodsi.Op = gc.OINDREG noddi.Op = gc.OINDREG cx.Type = gc.Types[gc.TINT32] nodsi.Type = gc.Types[gc.TINT32] noddi.Type = gc.Types[gc.TINT32] if c > 4 { nodsi.Xoffset = 0 noddi.Xoffset = 0 gmove(&nodsi, &cx) gmove(&cx, &noddi) } nodsi.Xoffset = c - 4 noddi.Xoffset = c - 4 gmove(&nodsi, &cx) gmove(&cx, &noddi) } else { nodsi.Op = gc.OINDREG noddi.Op = gc.OINDREG cx.Type = gc.Types[gc.TINT64] nodsi.Type = gc.Types[gc.TINT64] noddi.Type = gc.Types[gc.TINT64] nodsi.Xoffset = c - 8 noddi.Xoffset = c - 8 gmove(&nodsi, &cx) gmove(&cx, &noddi) } } restx(&cx, &oldcx) }