diff --git a/src/cmd/compile/internal/gc/bexport.go b/src/cmd/compile/internal/gc/bexport.go
index 092cdac..7020902 100644
--- a/src/cmd/compile/internal/gc/bexport.go
+++ b/src/cmd/compile/internal/gc/bexport.go
@@ -92,7 +92,7 @@
 import (
 	"bytes"
 	"cmd/compile/internal/big"
-	"cmd/internal/obj"
+	"cmd/internal/bio"
 	"encoding/binary"
 	"fmt"
 	"sort"
@@ -124,7 +124,7 @@
 const exportInlined = true // default: true
 
 type exporter struct {
-	out      *obj.Biobuf
+	out      *bio.Buf
 	pkgIndex map[*Pkg]int
 	typIndex map[*Type]int
 	inlined  []*Func
@@ -136,7 +136,7 @@
 }
 
 // Export writes the exportlist for localpkg to out and returns the number of bytes written.
-func Export(out *obj.Biobuf, trace bool) int {
+func Export(out *bio.Buf, trace bool) int {
 	p := exporter{
 		out:      out,
 		pkgIndex: make(map[*Pkg]int),
@@ -1531,10 +1531,10 @@
 		fallthrough
 	case '|':
 		// write '|' as '|' '|'
-		obj.Bputc(p.out, '|')
+		p.out.WriteByte('|')
 		p.written++
 	}
-	obj.Bputc(p.out, b)
+	p.out.WriteByte(b)
 	p.written++
 }
 
diff --git a/src/cmd/compile/internal/gc/export.go b/src/cmd/compile/internal/gc/export.go
index 17311cf..5d4add8 100644
--- a/src/cmd/compile/internal/gc/export.go
+++ b/src/cmd/compile/internal/gc/export.go
@@ -7,7 +7,7 @@
 import (
 	"bufio"
 	"bytes"
-	"cmd/internal/obj"
+	"cmd/internal/bio"
 	"fmt"
 	"sort"
 	"unicode"
@@ -384,7 +384,7 @@
 		if debugFormat {
 			// save a copy of the export data
 			var copy bytes.Buffer
-			bcopy := obj.Binitw(&copy)
+			bcopy := bio.BufWriter(&copy)
 			size = Export(bcopy, Debug_export != 0)
 			bcopy.Flush() // flushing to bytes.Buffer cannot fail
 			if n, err := bout.Write(copy.Bytes()); n != size || err != nil {
@@ -577,7 +577,7 @@
 }
 
 func dumpasmhdr() {
-	b, err := obj.Bopenw(asmhdr)
+	b, err := bio.Create(asmhdr)
 	if err != nil {
 		Fatalf("%v", err)
 	}
@@ -604,5 +604,5 @@
 		}
 	}
 
-	obj.Bterm(b)
+	b.Close()
 }
diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index ef8b516..cd9db38 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -6,6 +6,7 @@
 
 import (
 	"cmd/compile/internal/ssa"
+	"cmd/internal/bio"
 	"cmd/internal/obj"
 )
 
@@ -132,7 +133,7 @@
 
 var outfile string
 
-var bout *obj.Biobuf
+var bout *bio.Buf
 
 var nerrors int
 
@@ -287,7 +288,7 @@
 
 var writearchive int
 
-var bstdout obj.Biobuf
+var bstdout *bio.Buf
 
 var Nacl bool
 
diff --git a/src/cmd/compile/internal/gc/main.go b/src/cmd/compile/internal/gc/main.go
index 079f491..c8a778c 100644
--- a/src/cmd/compile/internal/gc/main.go
+++ b/src/cmd/compile/internal/gc/main.go
@@ -9,6 +9,7 @@
 import (
 	"bufio"
 	"cmd/compile/internal/ssa"
+	"cmd/internal/bio"
 	"cmd/internal/obj"
 	"cmd/internal/sys"
 	"flag"
@@ -97,8 +98,8 @@
 
 	Ctxt = obj.Linknew(Thearch.LinkArch)
 	Ctxt.DiagFunc = Yyerror
-	Ctxt.Bso = &bstdout
-	bstdout = *obj.Binitw(os.Stdout)
+	bstdout = bio.BufWriter(os.Stdout)
+	Ctxt.Bso = bstdout
 
 	localpkg = mkpkg("")
 	localpkg.Prefix = "\"\""
diff --git a/src/cmd/compile/internal/gc/obj.go b/src/cmd/compile/internal/gc/obj.go
index 99eb73b..3920e25 100644
--- a/src/cmd/compile/internal/gc/obj.go
+++ b/src/cmd/compile/internal/gc/obj.go
@@ -5,6 +5,7 @@
 package gc
 
 import (
+	"cmd/internal/bio"
 	"cmd/internal/obj"
 	"crypto/sha256"
 	"fmt"
@@ -23,7 +24,7 @@
 
 func dumpobj() {
 	var err error
-	bout, err = obj.Bopenw(outfile)
+	bout, err = bio.Create(outfile)
 	if err != nil {
 		Flusherrors()
 		fmt.Printf("can't create %s: %v\n", outfile, err)
@@ -33,10 +34,10 @@
 	startobj := int64(0)
 	var arhdr [ArhdrSize]byte
 	if writearchive != 0 {
-		obj.Bwritestring(bout, "!<arch>\n")
+		bout.WriteString("!<arch>\n")
 		arhdr = [ArhdrSize]byte{}
 		bout.Write(arhdr[:])
-		startobj = obj.Boffset(bout)
+		startobj = bio.Boffset(bout)
 	}
 
 	fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring())
@@ -44,19 +45,19 @@
 
 	if writearchive != 0 {
 		bout.Flush()
-		size := obj.Boffset(bout) - startobj
+		size := bio.Boffset(bout) - startobj
 		if size&1 != 0 {
-			obj.Bputc(bout, 0)
+			bout.WriteByte(0)
 		}
-		obj.Bseek(bout, startobj-ArhdrSize, 0)
+		bio.Bseek(bout, startobj-ArhdrSize, 0)
 		formathdr(arhdr[:], "__.PKGDEF", size)
 		bout.Write(arhdr[:])
 		bout.Flush()
 
-		obj.Bseek(bout, startobj+size+(size&1), 0)
+		bio.Bseek(bout, startobj+size+(size&1), 0)
 		arhdr = [ArhdrSize]byte{}
 		bout.Write(arhdr[:])
-		startobj = obj.Boffset(bout)
+		startobj = bio.Boffset(bout)
 		fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring())
 	}
 
@@ -91,16 +92,16 @@
 
 	if writearchive != 0 {
 		bout.Flush()
-		size := obj.Boffset(bout) - startobj
+		size := bio.Boffset(bout) - startobj
 		if size&1 != 0 {
-			obj.Bputc(bout, 0)
+			bout.WriteByte(0)
 		}
-		obj.Bseek(bout, startobj-ArhdrSize, 0)
+		bio.Bseek(bout, startobj-ArhdrSize, 0)
 		formathdr(arhdr[:], "_go_.o", size)
 		bout.Write(arhdr[:])
 	}
 
-	obj.Bterm(bout)
+	bout.Close()
 }
 
 func dumpglobls() {
@@ -132,9 +133,9 @@
 	funcsyms = nil
 }
 
-func Bputname(b *obj.Biobuf, s *obj.LSym) {
-	obj.Bwritestring(b, s.Name)
-	obj.Bputc(b, 0)
+func Bputname(b *bio.Buf, s *obj.LSym) {
+	b.WriteString(s.Name)
+	b.WriteByte(0)
 }
 
 func Linksym(s *Sym) *obj.LSym {