move math routines from package sys to package math,

though they still build in src/runtime.

use cgo instead of hand-written wrappers.

R=r
DELTA=740  (289 added, 300 deleted, 151 changed)
OCL=23326
CL=23331

28 files changed, 433 insertions, 434 deletions

diff --git a/src/cmd/gc/sys.go b/src/cmd/gc/sys.go
index 28a22fba3..fc10f181a 100644
--- a/src/cmd/gc/sys.go
+++ b/src/cmd/gc/sys.go
@@ -77,27 +77,9 @@ func	Unreflect(uint64, string, bool) (ret interface { });
 var	Args []string;
 var	Envs []string;
 
-func	Frexp(float64) (float64, int);		// break fp into exp,fract
-func	Ldexp(float64, int) float64;		// make fp from exp,fract
-func	Modf(float64) (float64, float64);	// break fp into double.double
-func	IsInf(float64, int) bool;		// test for infinity
-func	IsNaN(float64) bool;			// test for not-a-number
-func	Inf(int) float64;			// return signed Inf
-func	NaN() float64;				// return a NaN
-func	Float32bits(float32) uint32;		// raw bits
-func	Float64bits(float64) uint64;		// raw bits
-func	Float32frombits(uint32) float32;	// raw bits
-func	Float64frombits(uint64) float64;	// raw bits
-
 func	Gosched();
 func	Goexit();
 
-func	BytesToRune(*byte, int, int) (int, int);	// convert bytes to runes
-func	StringToRune(string, int) (int, int);	// convert bytes to runes
-
 func	Exit(int);
 
 func	Caller(n int) (pc uint64, file string, line int, ok bool);
-
-func	SemAcquire(sema *int32);
-func	SemRelease(sema *int32);
diff --git a/src/cmd/gc/sysimport.c b/src/cmd/gc/sysimport.c
index 734272aca..bccc8f877 100644
--- a/src/cmd/gc/sysimport.c
+++ b/src/cmd/gc/sysimport.c
@@ -55,29 +55,16 @@ char *sysimport =
 	"func sys.Unreflect (? uint64, ? string, ? bool) (ret interface { })\n"
 	"var sys.Args []string\n"
 	"var sys.Envs []string\n"
-	"func sys.Frexp (? float64) (? float64, ? int)\n"
-	"func sys.Ldexp (? float64, ? int) (? float64)\n"
-	"func sys.Modf (? float64) (? float64, ? float64)\n"
-	"func sys.IsInf (? float64, ? int) (? bool)\n"
-	"func sys.IsNaN (? float64) (? bool)\n"
-	"func sys.Inf (? int) (? float64)\n"
-	"func sys.NaN () (? float64)\n"
-	"func sys.Float32bits (? float32) (? uint32)\n"
-	"func sys.Float64bits (? float64) (? uint64)\n"
-	"func sys.Float32frombits (? uint32) (? float32)\n"
-	"func sys.Float64frombits (? uint64) (? float64)\n"
 	"func sys.Gosched ()\n"
 	"func sys.Goexit ()\n"
-	"func sys.BytesToRune (? *uint8, ? int, ? int) (? int, ? int)\n"
-	"func sys.StringToRune (? string, ? int) (? int, ? int)\n"
 	"func sys.Exit (? int)\n"
 	"func sys.Caller (n int) (pc uint64, file string, line int, ok bool)\n"
-	"func sys.SemAcquire (sema *int32)\n"
-	"func sys.SemRelease (sema *int32)\n"
+	"func sys.Init·sys ()\n"
 	"\n"
 	"$$\n";
 char *unsafeimport =
 	"package unsafe\n"
 	"type unsafe.Pointer *any\n"
+	"func unsafe.Init·unsafe ()\n"
 	"\n"
 	"$$\n";
diff --git a/src/cmd/gc/unsafe.go b/src/cmd/gc/unsafe.go
index ba6aa7c46..2b2187b3e 100644
--- a/src/cmd/gc/unsafe.go
+++ b/src/cmd/gc/unsafe.go
@@ -5,4 +5,4 @@
 
 package PACKAGE
 
-export	type	pointer	*any;
+type	Pointer	*any;
diff --git a/src/lib/Makefile b/src/lib/Makefile
index c24b02b31..3cfde17b5 100644
--- a/src/lib/Makefile
+++ b/src/lib/Makefile
@@ -105,7 +105,7 @@ net.dirinstall: fmt.dirinstall once.install os.dirinstall strconv.dirinstall str
 os.dirinstall: syscall.dirinstall
 regexp.dirinstall: os.dirinstall
 reflect.dirinstall: strconv.dirinstall sync.dirinstall
-strconv.dirinstall: os.dirinstall utf8.install
+strconv.dirinstall: math.dirinstall os.dirinstall utf8.install
 tabwriter.dirinstall: os.dirinstall io.dirinstall container/array.dirinstall
 time.dirinstall: once.install os.dirinstall
 sync.dirinstall:
diff --git a/src/lib/fmt/fmt_test.go b/src/lib/fmt/fmt_test.go
index 881fd1a36..8cafcd159 100644
--- a/src/lib/fmt/fmt_test.go
+++ b/src/lib/fmt/fmt_test.go
@@ -7,6 +7,7 @@ package fmt
 import (
 	"fmt";
 	"io";
+	"math";
 	"syscall";
 	"testing";
 )
@@ -145,9 +146,9 @@ var fmttests = []fmtTest{
 	fmtTest{ "%g",		float64(1.23456789e3),	"1234.56789" },
 	fmtTest{ "%g",		float64(1.23456789e-3),	"0.00123456789" },
 	fmtTest{ "%g",		float64(1.23456789e20),	"1.23456789e+20" },
-	fmtTest{ "%20e",	sys.Inf(1),		"                +Inf" },
-	fmtTest{ "%-20f",	sys.Inf(-1),		"-Inf                " },
-	fmtTest{ "%20g",	sys.NaN(),		"                 NaN" },
+	fmtTest{ "%20e",	math.Inf(1),		"                +Inf" },
+	fmtTest{ "%-20f",	math.Inf(-1),		"-Inf                " },
+	fmtTest{ "%20g",	math.NaN(),		"                 NaN" },
 }
 
 func TestSprintf(t *testing.T) {
diff --git a/src/lib/math/Makefile b/src/lib/math/Makefile
index d0debdbbc..623626e96 100644
--- a/src/lib/math/Makefile
+++ b/src/lib/math/Makefile
@@ -32,48 +32,56 @@ coverage: packages
 	$(AS) $*.s
 
 O1=\
-	exp.$O\
 	fabs.$O\
-	floor.$O\
-	fmod.$O\
 	hypot.$O\
 	pow10.$O\
-	sqrt.$O\
+	runtime.$O\
 	const.$O\
 
 O2=\
 	atan.$O\
+	exp.$O\
+	floor.$O\
+	fmod.$O\
 	log.$O\
 	sin.$O\
-	sinh.$O\
+	sqrt.$O\
 	tan.$O\
 
 O3=\
 	asin.$O\
 	atan2.$O\
 	pow.$O\
+	sinh.$O\
+
+O4=\
 	tanh.$O\
 
-math.a: a1 a2 a3
+math.a: a1 a2 a3 a4
 
 a1:	$(O1)
-	$(AR) grc math.a exp.$O fabs.$O floor.$O fmod.$O hypot.$O pow10.$O sqrt.$O const.$O
+	$(AR) grc math.a fabs.$O hypot.$O pow10.$O runtime.$O const.$O
 	rm -f $(O1)
 
 a2:	$(O2)
-	$(AR) grc math.a atan.$O log.$O sin.$O sinh.$O tan.$O
+	$(AR) grc math.a atan.$O exp.$O floor.$O fmod.$O log.$O sin.$O sqrt.$O tan.$O
 	rm -f $(O2)
 
 a3:	$(O3)
-	$(AR) grc math.a asin.$O atan2.$O pow.$O tanh.$O
+	$(AR) grc math.a asin.$O atan2.$O pow.$O sinh.$O
 	rm -f $(O3)
 
+a4:	$(O4)
+	$(AR) grc math.a tanh.$O
+	rm -f $(O4)
+
 newpkg: clean
 	$(AR) grc math.a
 
 $(O1): newpkg
 $(O2): a1
 $(O3): a2
+$(O4): a3
 
 nuke: clean
 	rm -f $(GOROOT)/pkg/math.a
diff --git a/src/lib/math/asin.go b/src/lib/math/asin.go
index d39339ea1..cd3a0b7a0 100644
--- a/src/lib/math/asin.go
+++ b/src/lib/math/asin.go
@@ -24,7 +24,7 @@ func Asin(arg float64) float64 {
 		sign = true;
 	}
 	if arg > 1 {
-		return sys.NaN();
+		return NaN();
 	}
 
 	temp = Sqrt(1 - x*x);
@@ -42,7 +42,7 @@ func Asin(arg float64) float64 {
 
 func Acos(arg float64) float64 {
 	if arg > 1 || arg < -1 {
-		return sys.NaN();
+		return NaN();
 	}
 	return Pi/2 - Asin(arg);
 }
diff --git a/src/lib/math/exp.go b/src/lib/math/exp.go
index 0d06ff9cb..d781c1dec 100644
--- a/src/lib/math/exp.go
+++ b/src/lib/math/exp.go
@@ -101,12 +101,12 @@ func Exp(x float64) float64 {
 
 	// special cases
 	switch {
-	case sys.IsNaN(x) || sys.IsInf(x, 1):
+	case IsNaN(x) || IsInf(x, 1):
 		return x;
-	case sys.IsInf(x, -1):
+	case IsInf(x, -1):
 		return 0;
 	case x > Overflow:
-		return sys.Inf(1);
+		return Inf(1);
 	case x < Underflow:
 		return 0;
 	case -NearZero < x && x < NearZero:
@@ -129,6 +129,6 @@ func Exp(x float64) float64 {
 	t := r * r;
 	c := r - t*(P1+t*(P2+t*(P3+t*(P4+t*P5))));
 	y := 1 - ((lo - (r*c)/(2-c)) - hi);
-	// TODO(rsc): make sure sys.Ldexp can handle boundary k
-	return sys.Ldexp(y, k);
+	// TODO(rsc): make sure Ldexp can handle boundary k
+	return Ldexp(y, k);
 }
diff --git a/src/lib/math/floor.go b/src/lib/math/floor.go
index 1cbdded47..cedecd1f6 100644
--- a/src/lib/math/floor.go
+++ b/src/lib/math/floor.go
@@ -4,6 +4,8 @@
 
 package math
 
+import "math"
+
 /*
  * floor and ceil-- greatest integer <= arg
  * (resp least >=)
@@ -11,13 +13,13 @@ package math
 
 func Floor(arg float64) float64 {
 	if arg < 0 {
-		d, fract := sys.Modf(-arg);
+		d, fract := Modf(-arg);
 		if fract != 0.0 {
 			d = d+1;
 		}
 		return -d;
 	}
-	d, fract := sys.Modf(arg);
+	d, fract := Modf(arg);
 	return d;
 }
 
diff --git a/src/lib/math/fmod.go b/src/lib/math/fmod.go
index f30ae3563..75e5eece2 100644
--- a/src/lib/math/fmod.go
+++ b/src/lib/math/fmod.go
@@ -4,6 +4,8 @@
 
 package math
 
+import "math"
+
 /*
  *	floating-point mod func without infinity or NaN checking
  */
@@ -16,7 +18,7 @@ func Fmod(x, y float64) float64 {
 		y = -y;
 	}
 
-	yfr, yexp := sys.Frexp(y);
+	yfr, yexp := Frexp(y);
 	sign := false;
 	r := x;
 	if x < 0 {
@@ -25,11 +27,11 @@ func Fmod(x, y float64) float64 {
 	}
 
 	for r >= y {
-		rfr, rexp := sys.Frexp(r);
+		rfr, rexp := Frexp(r);
 		if rfr < yfr {
 			rexp = rexp - 1;
 		}
-		r = r - sys.Ldexp(y, rexp-yexp);
+		r = r - Ldexp(y, rexp-yexp);
 	}
 	if sign {
 		r = -r;
diff --git a/src/lib/math/log.go b/src/lib/math/log.go
index 76b5231e5..887421642 100644
--- a/src/lib/math/log.go
+++ b/src/lib/math/log.go
@@ -85,16 +85,16 @@ func Log(x float64) float64 {
 
 	// special cases
 	switch {
-	case sys.IsNaN(x) || sys.IsInf(x, 1):
+	case IsNaN(x) || IsInf(x, 1):
 		return x;
 	case x < 0:
-		return sys.NaN();
+		return NaN();
 	case x == 0:
-		return sys.Inf(-1);
+		return Inf(-1);
 	}
 
 	// reduce
-	f1, ki := sys.Frexp(x);
+	f1, ki := Frexp(x);
 	if f1 < Sqrt2/2 {
 		f1 *= 2;
 		ki--;
@@ -115,7 +115,7 @@ func Log(x float64) float64 {
 
 func Log10(arg float64) float64 {
 	if arg <= 0 {
-		return sys.NaN();
+		return NaN();
 	}
 	return Log(arg) * (1/Ln10);
 }
diff --git a/src/lib/math/pow.go b/src/lib/math/pow.go
index 3ab218d5e..929943a13 100644
--- a/src/lib/math/pow.go
+++ b/src/lib/math/pow.go
@@ -17,7 +17,7 @@ func Pow(x, y float64) float64 {
 	case x == 0 && y > 0:
 		return 0;
 	case x == 0 && y < 0:
-		return sys.Inf(1);
+		return Inf(1);
 	case y == 0.5:
 		return Sqrt(x);
 	case y == -0.5:
@@ -30,9 +30,9 @@ func Pow(x, y float64) float64 {
 		absy = -absy;
 		flip = true;
 	}
-	yi, yf := sys.Modf(absy);
+	yi, yf := Modf(absy);
 	if yf != 0 && x < 0 {
-		return sys.NaN();
+		return NaN();
 	}
 	if yi >= 1<<63 {
 		return Exp(y * Log(x));
@@ -55,7 +55,7 @@ func Pow(x, y float64) float64 {
 	// by multiplying in successive squarings
 	// of x according to bits of yi.
 	// accumulate powers of two into exp.
-	x1, xe := sys.Frexp(x);
+	x1, xe := Frexp(x);
 	for i := int64(yi); i != 0; i >>= 1 {
 		if i&1 == 1 {
 			a1 *= x1;
@@ -76,5 +76,5 @@ func Pow(x, y float64) float64 {
 		a1 = 1 / a1;
 		ae = -ae;
 	}
-	return sys.Ldexp(a1, ae);
+	return Ldexp(a1, ae);
 }
diff --git a/src/lib/math/sin.go b/src/lib/math/sin.go
index fc8a05d4b..9c7b39bf8 100644
--- a/src/lib/math/sin.go
+++ b/src/lib/math/sin.go
@@ -29,9 +29,9 @@ func sinus(arg float64, quad int) float64 {
 	var y float64;
 	if x > 32764 {
 		var e float64;
-		e, y = sys.Modf(x);
+		e, y = Modf(x);
 		e = e + float64(quad);
-		temp1, f := sys.Modf(0.25*e);
+		temp1, f := Modf(0.25*e);
 		quad = int(e - 4*f);
 	} else {
 		k := int32(x);
diff --git a/src/lib/math/sqrt.go b/src/lib/math/sqrt.go
index cf256b25c..466b92771 100644
--- a/src/lib/math/sqrt.go
+++ b/src/lib/math/sqrt.go
@@ -4,6 +4,8 @@
 
 package math
 
+import "math"
+
 /*
  *	sqrt returns the square root of its floating
  *	point argument. Newton's method.
@@ -12,18 +14,18 @@ package math
  */
 
 func Sqrt(arg float64) float64 {
-	if sys.IsInf(arg, 1) {
+	if IsInf(arg, 1) {
 		return arg;
 	}
 
 	if arg <= 0 {
 		if arg < 0 {
-			return sys.NaN();
+			return NaN();
 		}
 		return 0;
 	}
 
-	x,exp := sys.Frexp(arg);
+	x,exp := Frexp(arg);
 	for x < 0.5 {
 		x = x*2;
 		exp = exp-1;
diff --git a/src/lib/math/tan.go b/src/lib/math/tan.go
index 4910fa3a4..99155d005 100644
--- a/src/lib/math/tan.go
+++ b/src/lib/math/tan.go
@@ -33,7 +33,7 @@ func Tan(arg float64) float64 {
 	}
 	x = x * (4/Pi);   /* overflow? */
 	var e float64;
-	e, x = sys.Modf(x);
+	e, x = Modf(x);
 	i := int32(e);
 
 	switch i & 3 {
@@ -56,7 +56,7 @@ func Tan(arg float64) float64 {
 
 	if flag {
 		if(temp == 0) {
-			panic(sys.NaN());
+			panic(NaN());
 		}
 		temp = 1/temp;
 	}
diff --git a/src/lib/strconv/atof.go b/src/lib/strconv/atof.go
index e562bfdb3..358594416 100644
--- a/src/lib/strconv/atof.go
+++ b/src/lib/strconv/atof.go
@@ -11,6 +11,7 @@
 package strconv
 
 import (
+	"math";
 	"os";
 	"strconv";
 )
@@ -329,7 +330,7 @@ func Atof64(s string) (f float64, err *os.Error) {
 		}
 	}
 	b, ovf := decimalToFloatBits(neg, d, trunc, &float64info);
-	f = sys.Float64frombits(b);
+	f = math.Float64frombits(b);
 	if ovf {
 		err = os.ERANGE;
 	}
@@ -347,7 +348,7 @@ func Atof32(s string) (f float32, err *os.Error) {
 		}
 	}
 	b, ovf := decimalToFloatBits(neg, d, trunc, &float32info);
-	f = sys.Float32frombits(uint32(b));
+	f = math.Float32frombits(uint32(b));
 	if ovf {
 		err = os.ERANGE;
 	}
diff --git a/src/lib/strconv/ftoa.go b/src/lib/strconv/ftoa.go
index c4951873d..52835c803 100644
--- a/src/lib/strconv/ftoa.go
+++ b/src/lib/strconv/ftoa.go
@@ -10,7 +10,10 @@
 
 package strconv
 
-import "strconv"
+import (
+	"math";
+	"strconv";
+)
 
 // TODO: move elsewhere?
 type floatInfo struct {
@@ -41,11 +44,11 @@ func floatsize() int {
 var FloatSize = floatsize()
 
 func Ftoa32(f float32, fmt byte, prec int) string {
-	return genericFtoa(uint64(sys.Float32bits(f)), fmt, prec, &float32info);
+	return genericFtoa(uint64(math.Float32bits(f)), fmt, prec, &float32info);
 }
 
 func Ftoa64(f float64, fmt byte, prec int) string {
-	return genericFtoa(sys.Float64bits(f), fmt, prec, &float64info);
+	return genericFtoa(math.Float64bits(f), fmt, prec, &float64info);
 }
 
 func Ftoa(f float, fmt byte, prec int) string {
diff --git a/src/lib/strconv/ftoa_test.go b/src/lib/strconv/ftoa_test.go
index 309f02870..0f0baa514 100644
--- a/src/lib/strconv/ftoa_test.go
+++ b/src/lib/strconv/ftoa_test.go
@@ -5,6 +5,7 @@
 package strconv
 
 import (
+	"math";
 	"strconv";
 	"testing"
 )
@@ -89,11 +90,11 @@ var ftoatests = []ftoaTest {
 
 	ftoaTest{ 100, 'x', -1, "%x" },
 
-	ftoaTest{ sys.NaN(), 'g', -1, "NaN" },
-	ftoaTest{ -sys.NaN(), 'g', -1, "NaN" },
-	ftoaTest{ sys.Inf(0), 'g', -1, "+Inf" },
-	ftoaTest{ sys.Inf(-1), 'g', -1,  "-Inf" },
-	ftoaTest{ -sys.Inf(0), 'g', -1, "-Inf" },
+	ftoaTest{ math.NaN(), 'g', -1, "NaN" },
+	ftoaTest{ -math.NaN(), 'g', -1, "NaN" },
+	ftoaTest{ math.Inf(0), 'g', -1, "+Inf" },
+	ftoaTest{ math.Inf(-1), 'g', -1,  "-Inf" },
+	ftoaTest{ -math.Inf(0), 'g', -1, "-Inf" },
 
 	ftoaTest{ -1, 'b', -1, "-4503599627370496p-52" },
 }
diff --git a/src/runtime/Makefile b/src/runtime/Makefile
index f62229fd2..03633a61d 100644
--- a/src/runtime/Makefile
+++ b/src/runtime/Makefile
@@ -17,23 +17,26 @@ LIBOFILES=\
 	rt1_$(GOARCH)_$(GOOS).$O\
 	rt2_$(GOARCH).$O\
 	sys_$(GOARCH)_$(GOOS).$O\
-	runtime.$O\
-	hashmap.$O\
+	array.$O\
 	chan.$O\
+	float.$O\
+	float_go.$O\
+	hashmap.$O\
 	iface.$O\
-	array.$O\
-	mem.$O\
 	malloc.$O\
 	malloc_go.$O\
 	mcache.$O\
 	mcentral.$O\
+	mem.$O\
 	mfixalloc.$O\
 	mheap.$O\
 	msize.$O\
 	print.$O\
-	rune.$O\
 	proc.$O\
+	rune.$O\
+	runtime.$O\
 	sema.$O\
+	sema_go.$O\
 	string.$O\
 	symtab.$O\
 
@@ -69,7 +72,7 @@ cgo2c: cgo2c.c
 	quietgcc -o $@ $<
 
 %.c:	%.cgo cgo2c
-	./cgo2c < $< > $@.tmp
+	./cgo2c $< > $@.tmp
 	mv -f $@.tmp $@
 
 %.$O:	%.s
diff --git a/src/runtime/amd64_darwin.h b/src/runtime/amd64_darwin.h
index 45174cb42..28e58972b 100644
--- a/src/runtime/amd64_darwin.h
+++ b/src/runtime/amd64_darwin.h
@@ -58,8 +58,8 @@ void bsdthread_register(void);
 typedef int32 kern_return_t;
 typedef uint32 mach_port_t;
 
-mach_port_t semcreate(void);
-void semacquire(mach_port_t);
-void semrelease(mach_port_t);
-void semreset(mach_port_t);
-void semdestroy(mach_port_t);
+mach_port_t mach_semcreate(void);
+void mach_semacquire(mach_port_t);
+void mach_semrelease(mach_port_t);
+void mach_semreset(mach_port_t);
+void mach_semdestroy(mach_port_t);
diff --git a/src/runtime/cgo2c.c b/src/runtime/cgo2c.c
index 0d1817d6b..3905f7e6d 100644
--- a/src/runtime/cgo2c.c
+++ b/src/runtime/cgo2c.c
@@ -21,11 +21,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
-/* The name of the program.  */
-static const char *program_name;
+/* Whether we're emitting for gcc */
+static int gcc;
 
-/* The line number.  */
+/* File and line number */
+static const char *file;
 static unsigned int lineno;
 
 /* List of names and types.  */
@@ -39,8 +41,7 @@ struct params {
 static void
 bad_eof(void)
 {
-	fprintf(stderr, "%s: line %u: unexpected EOF\n",
-		program_name, lineno);
+	fprintf(stderr, "%s:%u: unexpected EOF\n", file, lineno);
 	exit(1);
 }
 
@@ -48,8 +49,7 @@ bad_eof(void)
 static void
 bad_mem(void)
 {
-	fprintf(stderr, "%s: line %u: out of memory\n",
-		program_name, lineno);
+	fprintf(stderr, "%s:%u: out of memory\n", file, lineno);
 	exit(1);
 }
 
@@ -212,8 +212,8 @@ read_package(void)
 	token = read_token_no_eof();
 	if (strcmp(token, "package") != 0) {
 		fprintf(stderr,
-			"%s: line %u: expected \"package\", got \"%s\"\n",
-			program_name, lineno, token);
+			"%s:%u: expected \"package\", got \"%s\"\n",
+			file, lineno, token);
 		exit(1);
 	}
 	return read_token_no_eof();
@@ -298,8 +298,8 @@ read_params(void)
 		}
 	}
 	if (strcmp(token, ")") != 0) {
-		fprintf(stderr, "%s: line %u: expected '('\n",
-			program_name, lineno);
+		fprintf(stderr, "%s:%u: expected '('\n",
+			file, lineno);
 		exit(1);
 	}
 	return ret;
@@ -316,16 +316,16 @@ read_func_header(char **name, struct params **params, struct params **rets)
 	if (token == NULL)
 		return 0;
 	if (strcmp(token, "func") != 0) {
-		fprintf(stderr, "%s: line %u: expected \"func\"\n",
-			program_name, lineno);
+		fprintf(stderr, "%s:%u: expected \"func\"\n",
+			file, lineno);
 		exit(1);
 	}
 	*name = read_token_no_eof();
 
 	token = read_token();
 	if (token == NULL || strcmp(token, "(") != 0) {
-		fprintf(stderr, "%s: line %u: expected \"(\"\n",
-			program_name, lineno);
+		fprintf(stderr, "%s:%u: expected \"(\"\n",
+			file, lineno);
 		exit(1);
 	}
 	*params = read_params();
@@ -338,8 +338,8 @@ read_func_header(char **name, struct params **params, struct params **rets)
 		token = read_token();
 	}
 	if (token == NULL || strcmp(token, "{") != 0) {
-		fprintf(stderr, "%s: line %u: expected \"{\"\n",
-			program_name, lineno);
+		fprintf(stderr, "%s:%u: expected \"{\"\n",
+			file, lineno);
 		exit(1);
 	}
 	return 1;
@@ -455,21 +455,22 @@ write_gcc_func_trailer(char *package, char *name, struct params *rets)
 
 /* Write out a function header.  */
 static void
-write_func_header(int flag_gcc, char *package, char *name,
+write_func_header(char *package, char *name,
 		  struct params *params, struct params *rets)
 {
-	if (flag_gcc)
+	if (gcc)
 		write_gcc_func_header(package, name, params, rets);
 	else
 		write_6g_func_header(package, name, params, rets);
+	printf("#line %d \"%s\"\n", lineno, file);
 }
 
 /* Write out a function trailer.  */
 static void
-write_func_trailer(int flag_gcc, char *package, char *name,
+write_func_trailer(char *package, char *name,
 		   struct params *rets)
 {
-	if (flag_gcc)
+	if (gcc)
 		write_gcc_func_trailer(package, name, rets);
 	else
 		write_6g_func_trailer(rets);
@@ -478,7 +479,7 @@ write_func_trailer(int flag_gcc, char *package, char *name,
 /* Read and write the body of the function, ending in an unnested }
    (which is read but not written).  */
 static void
-copy_body()
+copy_body(void)
 {
 	int nesting = 0;
 	while (1) {
@@ -541,7 +542,7 @@ copy_body()
 
 /* Process the entire file.  */
 static void
-process_file(int flag_gcc)
+process_file(void)
 {
 	char *package, *name;
 	struct params *params, *rets;
@@ -549,9 +550,9 @@ process_file(int flag_gcc)
 	package = read_package();
 	read_preprocessor_lines();
 	while (read_func_header(&name, &params, &rets)) {
-		write_func_header(flag_gcc, package, name, params, rets);
+		write_func_header(package, name, params, rets);
 		copy_body();
-		write_func_trailer(flag_gcc, package, name, rets);
+		write_func_trailer(package, name, rets);
 		free(name);
 		free_params(params);
 		free_params(rets);
@@ -559,25 +560,43 @@ process_file(int flag_gcc)
 	free(package);
 }
 
-/* Main function.  */
+static void
+usage(void)
+{
+	fprintf(stderr, "Usage: cgo2c [--6g | --gc] [file]\n");
+	exit(1);
+}
+
 int
 main(int argc, char **argv)
 {
-	int flag_gcc = 0;
-	int i;
-
-	program_name = argv[0];
-	for (i = 1; i < argc; ++i) {
-		if (strcmp(argv[i], "--6g") == 0)
-			flag_gcc = 0;
-		else if (strcmp(argv[i], "--gcc") == 0)
-			flag_gcc = 1;
-		else {
-			fprintf(stderr, "Usage: %s [--6g][--gcc]\n",
-				program_name);
-			exit(1);
-		}
+	while(argc > 1 && argv[1][0] == '-') {
+		if(strcmp(argv[1], "-") == 0)
+			break;
+		if(strcmp(argv[1], "--6g") == 0)
+			gcc = 0;
+		else if(strcmp(argv[1], "--gcc") == 0)
+			gcc = 1;
+		else
+			usage();
+		argc--;
+		argv++;
+	}
+	
+	if(argc <= 1 || strcmp(argv[1], "-") == 0) {
+		file = "<stdin>";
+		process_file();
+		return 0;
+	}
+	
+	if(argc > 2)
+		usage();
+
+	file = argv[1];
+	if(freopen(file, "r", stdin) == 0) {
+		fprintf(stderr, "open %s: %s\n", file, strerror(errno));
+		exit(1);
 	}
-	process_file(flag_gcc);
+	process_file();
 	return 0;
 }
diff --git a/src/runtime/float.c b/src/runtime/float.c
new file mode 100644
index 000000000..5122f359a
--- /dev/null
+++ b/src/runtime/float.c
@@ -0,0 +1,173 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+
+static	uint64	uvnan		= 0x7FF0000000000001ULL;
+static	uint64	uvinf		= 0x7FF0000000000000ULL;
+static	uint64	uvneginf	= 0xFFF0000000000000ULL;
+
+uint32
+float32tobits(float32 f)
+{
+	// The obvious cast-and-pointer code is technically
+	// not valid, and gcc miscompiles it.  Use a union instead.
+	union {
+		float32 f;
+		uint32 i;
+	} u;
+	u.f = f;
+	return u.i;
+}
+
+uint64
+float64tobits(float64 f)
+{
+	// The obvious cast-and-pointer code is technically
+	// not valid, and gcc miscompiles it.  Use a union instead.
+	union {
+		float64 f;
+		uint64 i;
+	} u;
+	u.f = f;
+	return u.i;
+}
+
+float64
+float64frombits(uint64 i)
+{
+	// The obvious cast-and-pointer code is technically
+	// not valid, and gcc miscompiles it.  Use a union instead.
+	union {
+		float64 f;
+		uint64 i;
+	} u;
+	u.i = i;
+	return u.f;
+}
+
+float32
+float32frombits(uint32 i)
+{
+	// The obvious cast-and-pointer code is technically
+	// not valid, and gcc miscompiles it.  Use a union instead.
+	union {
+		float32 f;
+		uint32 i;
+	} u;
+	u.i = i;
+	return u.f;
+}
+
+bool
+isInf(float64 f, int32 sign)
+{
+	uint64 x;
+
+	x = float64tobits(f);
+	if(sign == 0)
+		return x == uvinf || x == uvneginf;
+	if(sign > 0)
+		return x == uvinf;
+	return x == uvneginf;
+}
+
+float64
+NaN(void)
+{
+	return float64frombits(uvnan);
+}
+
+bool
+isNaN(float64 f)
+{
+	uint64 x;
+
+	x = float64tobits(f);
+	return ((uint32)(x>>52) & 0x7FF) == 0x7FF && !isInf(f, 0);
+}
+
+float64
+Inf(int32 sign)
+{
+	if(sign >= 0)
+		return float64frombits(uvinf);
+	else
+		return float64frombits(uvneginf);
+}
+
+enum
+{
+	MASK	= 0x7ffL,
+	SHIFT	= 64-11-1,
+	BIAS	= 1022L,
+};
+
+float64
+frexp(float64 d, int32 *ep)
+{
+	uint64 x;
+
+	if(d == 0) {
+		*ep = 0;
+		return 0;
+	}
+	x = float64tobits(d);
+	*ep = (int32)((x >> SHIFT) & MASK) - BIAS;
+	x &= ~((uint64)MASK << SHIFT);
+	x |= (uint64)BIAS << SHIFT;
+	return float64frombits(x);
+}
+
+float64
+ldexp(float64 d, int32 e)
+{
+	uint64 x;
+
+	if(d == 0)
+		return 0;
+	x = float64tobits(d);
+	e += (int32)(x >> SHIFT) & MASK;
+	if(e <= 0)
+		return 0;	/* underflow */
+	if(e >= MASK){		/* overflow */
+		if(d < 0)
+			return Inf(-1);
+		return Inf(1);
+	}
+	x &= ~((uint64)MASK << SHIFT);
+	x |= (uint64)e << SHIFT;
+	return float64frombits(x);
+}
+
+float64
+modf(float64 d, float64 *ip)
+{
+	float64 dd;
+	uint64 x;
+	int32 e;
+
+	if(d < 1) {
+		if(d < 0) {
+			d = modf(-d, ip);
+			*ip = -*ip;
+			return -d;
+		}
+		*ip = 0;
+		return d;
+	}
+
+	x = float64tobits(d);
+	e = (int32)((x >> SHIFT) & MASK) - BIAS;
+
+	/*
+	 * Keep the top 11+e bits; clear the rest.
+	 */
+	if(e <= 64-11)
+		x &= ~(((uint64)1 << (64LL-11LL-e))-1);
+	dd = float64frombits(x);
+	*ip = dd;
+	return d - dd;
+}
+
diff --git a/src/runtime/float_go.cgo b/src/runtime/float_go.cgo
new file mode 100644
index 000000000..518d55950
--- /dev/null
+++ b/src/runtime/float_go.cgo
@@ -0,0 +1,52 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package math
+
+#include "runtime.h"
+
+func Frexp(f float64) (frac float64, exp int32) {
+	frac = frexp(f, &exp);
+}
+
+func Ldexp(frac float64, exp int32) (f float64) {
+	f = ldexp(frac, exp);
+}
+
+func Modf(f float64) (integer float64, frac float64) {
+	frac = modf(f, &integer);
+}
+
+func IsInf(f float64, sign int32) (is bool) {
+	is = isInf(f, sign);
+}
+
+func IsNaN(f float64) (is bool) {
+	is = isNaN(f);
+}
+
+func Inf(sign int32) (f float64) {
+	f = Inf(sign);
+}
+
+func NaN() (f float64) {
+	f = NaN();
+}
+
+func Float32bits(f float32) (b uint32) {
+	b = float32tobits(f);
+}
+
+func Float64bits(f float64) (b uint64) {
+	b = float64tobits(f);
+}
+
+func Float32frombits(b uint32) (f float32) {
+	f = float32frombits(b);
+}
+
+func Float64frombits(b uint64) (f float64) {
+	f = float64frombits(b);
+}
+
diff --git a/src/runtime/rt1_amd64_darwin.c b/src/runtime/rt1_amd64_darwin.c
index f1ef94664..453bd519c 100644
--- a/src/runtime/rt1_amd64_darwin.c
+++ b/src/runtime/rt1_amd64_darwin.c
@@ -232,10 +232,10 @@ initsema(uint32 *psema)
 	if(*psema != 0)	// already have one
 		return;
 
-	sema = semcreate();
+	sema = mach_semcreate();
 	if(!cas(psema, 0, sema)){
 		// Someone else filled it in.  Use theirs.
-		semdestroy(sema);
+		mach_semdestroy(sema);
 		return;
 	}
 }
@@ -281,14 +281,14 @@ lock(Lock *l)
 		initsema(&l->sema);
 
 	if(xadd(&l->key, 1) > 1)	// someone else has it; wait
-		semacquire(l->sema);
+		mach_semacquire(l->sema);
 }
 
 void
 unlock(Lock *l)
 {
 	if(xadd(&l->key, -1) > 0)	// someone else is waiting
-		semrelease(l->sema);
+		mach_semrelease(l->sema);
 }
 
 
@@ -300,14 +300,14 @@ void
 usemacquire(Usema *s)
 {
 	if((int32)xadd(&s->u, -1) < 0)
-		semacquire(s->k);
+		mach_semacquire(s->k);
 }
 
 void
 usemrelease(Usema *s)
 {
 	if((int32)xadd(&s->u, 1) <= 0)
-		semrelease(s->k);
+		mach_semrelease(s->k);
 }
 
 
@@ -622,20 +622,20 @@ machcall(mach_msg_header_t *h, int32 maxsize, int32 rxsize)
 
 enum
 {
-	Tsemcreate = 3418,
-	Rsemcreate = Tsemcreate + Reply,
+	Tmach_semcreate = 3418,
+	Rmach_semcreate = Tmach_semcreate + Reply,
 
-	Tsemdestroy = 3419,
-	Rsemdestroy = Tsemdestroy + Reply,
+	Tmach_semdestroy = 3419,
+	Rmach_semdestroy = Tmach_semdestroy + Reply,
 };
 
-typedef struct TsemcreateMsg TsemcreateMsg;
-typedef struct RsemcreateMsg RsemcreateMsg;
-typedef struct TsemdestroyMsg TsemdestroyMsg;
-// RsemdestroyMsg = CodeMsg
+typedef struct Tmach_semcreateMsg Tmach_semcreateMsg;
+typedef struct Rmach_semcreateMsg Rmach_semcreateMsg;
+typedef struct Tmach_semdestroyMsg Tmach_semdestroyMsg;
+// Rmach_semdestroyMsg = CodeMsg
 
 #pragma pack on
-struct TsemcreateMsg
+struct Tmach_semcreateMsg
 {
 	mach_msg_header_t h;
 	NDR_record_t ndr;
@@ -643,14 +643,14 @@ struct TsemcreateMsg
 	int32 value;
 };
 
-struct RsemcreateMsg
+struct Rmach_semcreateMsg
 {
 	mach_msg_header_t h;
 	mach_msg_body_t body;
 	mach_msg_port_descriptor_t semaphore;
 };
 
-struct TsemdestroyMsg
+struct Tmach_semdestroyMsg
 {
 	mach_msg_header_t h;
 	mach_msg_body_t body;
@@ -659,11 +659,11 @@ struct TsemdestroyMsg
 #pragma pack off
 
 mach_port_t
-semcreate(void)
+mach_semcreate(void)
 {
 	union {
-		TsemcreateMsg tx;
-		RsemcreateMsg rx;
+		Tmach_semcreateMsg tx;
+		Rmach_semcreateMsg rx;
 		uint8 pad[MinMachMsg];
 	} m;
 	kern_return_t r;
@@ -671,7 +671,7 @@ semcreate(void)
 	m.tx.h.bits = 0;
 	m.tx.h.size = sizeof(m.tx);
 	m.tx.h.remote_port = mach_task_self();
-	m.tx.h.id = Tsemcreate;
+	m.tx.h.id = Tmach_semcreate;
 	m.tx.ndr = zerondr;
 
 	m.tx.policy = 0;	// 0 = SYNC_POLICY_FIFO
@@ -680,15 +680,15 @@ semcreate(void)
 	if((r = machcall(&m.tx.h, sizeof m, sizeof(m.rx))) != 0)
 		macherror(r, "semaphore_create");
 	if(m.rx.body.descriptor_count != 1)
-		unimplemented("semcreate desc count");
+		unimplemented("mach_semcreate desc count");
 	return m.rx.semaphore.name;
 }
 
 void
-semdestroy(mach_port_t sem)
+mach_semdestroy(mach_port_t sem)
 {
 	union {
-		TsemdestroyMsg tx;
+		Tmach_semdestroyMsg tx;
 		uint8 pad[MinMachMsg];
 	} m;
 	kern_return_t r;
@@ -696,7 +696,7 @@ semdestroy(mach_port_t sem)
 	m.tx.h.bits = MACH_MSGH_BITS_COMPLEX;
 	m.tx.h.size = sizeof(m.tx);
 	m.tx.h.remote_port = mach_task_self();
-	m.tx.h.id = Tsemdestroy;
+	m.tx.h.id = Tmach_semdestroy;
 	m.tx.body.descriptor_count = 1;
 	m.tx.semaphore.name = sem;
 	m.tx.semaphore.disposition = MACH_MSG_TYPE_MOVE_SEND;
@@ -714,7 +714,7 @@ kern_return_t mach_semaphore_signal(uint32 sema);
 kern_return_t mach_semaphore_signal_all(uint32 sema);
 
 void
-semacquire(mach_port_t sem)
+mach_semacquire(mach_port_t sem)
 {
 	kern_return_t r;
 
@@ -723,7 +723,7 @@ semacquire(mach_port_t sem)
 }
 
 void
-semrelease(mach_port_t sem)
+mach_semrelease(mach_port_t sem)
 {
 	kern_return_t r;
 
diff --git a/src/runtime/runtime.c b/src/runtime/runtime.c
index 31bd1ed86..29a67b190 100644
--- a/src/runtime/runtime.c
+++ b/src/runtime/runtime.c
@@ -113,261 +113,6 @@ rnd(uint32 n, uint32 m)
 	return n;
 }
 
-static	uint64	uvnan		= 0x7FF0000000000001ULL;
-static	uint64	uvinf		= 0x7FF0000000000000ULL;
-static	uint64	uvneginf	= 0xFFF0000000000000ULL;
-
-static uint32
-float32tobits(float32 f)
-{
-	// The obvious cast-and-pointer code is technically
-	// not valid, and gcc miscompiles it.  Use a union instead.
-	union {
-		float32 f;
-		uint32 i;
-	} u;
-	u.f = f;
-	return u.i;
-}
-
-static uint64
-float64tobits(float64 f)
-{
-	// The obvious cast-and-pointer code is technically
-	// not valid, and gcc miscompiles it.  Use a union instead.
-	union {
-		float64 f;
-		uint64 i;
-	} u;
-	u.f = f;
-	return u.i;
-}
-
-static float64
-float64frombits(uint64 i)
-{
-	// The obvious cast-and-pointer code is technically
-	// not valid, and gcc miscompiles it.  Use a union instead.
-	union {
-		float64 f;
-		uint64 i;
-	} u;
-	u.i = i;
-	return u.f;
-}
-
-static float32
-float32frombits(uint32 i)
-{
-	// The obvious cast-and-pointer code is technically
-	// not valid, and gcc miscompiles it.  Use a union instead.
-	union {
-		float32 f;
-		uint32 i;
-	} u;
-	u.i = i;
-	return u.f;
-}
-
-bool
-isInf(float64 f, int32 sign)
-{
-	uint64 x;
-
-	x = float64tobits(f);
-	if(sign == 0)
-		return x == uvinf || x == uvneginf;
-	if(sign > 0)
-		return x == uvinf;
-	return x == uvneginf;
-}
-
-static float64
-NaN(void)
-{
-	return float64frombits(uvnan);
-}
-
-bool
-isNaN(float64 f)
-{
-	uint64 x;
-
-	x = float64tobits(f);
-	return ((uint32)(x>>52) & 0x7FF) == 0x7FF && !isInf(f, 0);
-}
-
-static float64
-Inf(int32 sign)
-{
-	if(sign >= 0)
-		return float64frombits(uvinf);
-	else
-		return float64frombits(uvneginf);
-}
-
-enum
-{
-	MASK	= 0x7ffL,
-	SHIFT	= 64-11-1,
-	BIAS	= 1022L,
-};
-
-static float64
-frexp(float64 d, int32 *ep)
-{
-	uint64 x;
-
-	if(d == 0) {
-		*ep = 0;
-		return 0;
-	}
-	x = float64tobits(d);
-	*ep = (int32)((x >> SHIFT) & MASK) - BIAS;
-	x &= ~((uint64)MASK << SHIFT);
-	x |= (uint64)BIAS << SHIFT;
-	return float64frombits(x);
-}
-
-static float64
-ldexp(float64 d, int32 e)
-{
-	uint64 x;
-
-	if(d == 0)
-		return 0;
-	x = float64tobits(d);
-	e += (int32)(x >> SHIFT) & MASK;
-	if(e <= 0)
-		return 0;	/* underflow */
-	if(e >= MASK){		/* overflow */
-		if(d < 0)
-			return Inf(-1);
-		return Inf(1);
-	}
-	x &= ~((uint64)MASK << SHIFT);
-	x |= (uint64)e << SHIFT;
-	return float64frombits(x);
-}
-
-static float64
-modf(float64 d, float64 *ip)
-{
-	float64 dd;
-	uint64 x;
-	int32 e;
-
-	if(d < 1) {
-		if(d < 0) {
-			d = modf(-d, ip);
-			*ip = -*ip;
-			return -d;
-		}
-		*ip = 0;
-		return d;
-	}
-
-	x = float64tobits(d);
-	e = (int32)((x >> SHIFT) & MASK) - BIAS;
-
-	/*
-	 * Keep the top 11+e bits; clear the rest.
-	 */
-	if(e <= 64-11)
-		x &= ~(((uint64)1 << (64LL-11LL-e))-1);
-	dd = float64frombits(x);
-	*ip = dd;
-	return d - dd;
-}
-
-// func Frexp(float64) (float64, int32); // break fp into exp,frac
-void
-sys·Frexp(float64 din, float64 dou, int32 iou)
-{
-	dou = frexp(din, &iou);
-	FLUSH(&dou);
-}
-
-//func	ldexp(int32, float64) float64;	// make fp from exp,frac
-void
-sys·Ldexp(float64 din, int32 ein, float64 dou)
-{
-	dou = ldexp(din, ein);
-	FLUSH(&dou);
-}
-
-//func	modf(float64) (float64, float64);	// break fp into double+double
-void
-sys·Modf(float64 din, float64 integer, float64 fraction)
-{
-	fraction = modf(din, &integer);
-	FLUSH(&fraction);
-}
-
-//func	isinf(float64, int32 sign) bool;  // test for infinity
-void
-sys·IsInf(float64 din, int32 signin, bool out)
-{
-	out = isInf(din, signin);
-	FLUSH(&out);
-}
-
-//func	isnan(float64) bool;  // test for NaN
-void
-sys·IsNaN(float64 din, bool out)
-{
-	out = isNaN(din);
-	FLUSH(&out);
-}
-
-//func	inf(int32 sign) float64;  // signed infinity
-void
-sys·Inf(int32 signin, float64 out)
-{
-	out = Inf(signin);
-	FLUSH(&out);
-}
-
-//func	nan() float64;  // NaN
-void
-sys·NaN(float64 out)
-{
-	out = NaN();
-	FLUSH(&out);
-}
-
-// func float32bits(float32) uint32; // raw bits of float32
-void
-sys·Float32bits(float32 din, uint32 iou)
-{
-	iou = float32tobits(din);
-	FLUSH(&iou);
-}
-
-// func float64bits(float64) uint64; // raw bits of float64
-void
-sys·Float64bits(float64 din, uint64 iou)
-{
-	iou = float64tobits(din);
-	FLUSH(&iou);
-}
-
-// func float32frombits(uint32) float32; // raw bits to float32
-void
-sys·Float32frombits(uint32 uin, float32 dou)
-{
-	dou = float32frombits(uin);
-	FLUSH(&dou);
-}
-
-// func float64frombits(uint64) float64; // raw bits to float64
-void
-sys·Float64frombits(uint64 uin, float64 dou)
-{
-	dou = float64frombits(uin);
-	FLUSH(&dou);
-}
-
 static int32	argc;
 static uint8**	argv;
 
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 735f1aa9c..bc6b2f76d 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -370,15 +370,12 @@ void	notewakeup(Note*);
 #define sys_printpointer sys·printpointer
 #define sys_printstring sys·printstring
 #define sys_printuint sys·printuint
-#define sys_readfile sys·readfile
-#define sys_semacquire sys·semacquire
-#define sys_semrelease sys·semrelease
 #define sys_setcallerpc sys·setcallerpc
 #define sys_slicestring sys·slicestring
 #endif
 
 /*
- * low level go -called
+ * low level go-called
  */
 void	sys_Goexit(void);
 void	sys_Gosched(void);
@@ -407,12 +404,20 @@ void	sys_cmpstring(string, string, int32);
 void	sys_slicestring(string, int32, int32, string);
 void	sys_indexstring(string, int32, byte);
 void	sys_intstring(int64, string);
-bool	isInf(float64, int32);
-bool	isNaN(float64);
 
 /*
- * User go-called
+ * wrapped for go users
  */
-void	sys_readfile(string, string, bool);
-void	sys_semacquire(uint32*);
-void	sys_semrelease(uint32*);
+float64	Inf(int32 sign);
+float64	NaN(void);
+float32	float32frombits(uint32 i);
+uint32	float32tobits(float32 f);
+float64	float64frombits(uint64 i);
+uint64	float64tobits(float64 f);
+float64	frexp(float64 d, int32 *ep);
+bool	isInf(float64 f, int32 sign);
+bool	isNaN(float64 f);
+float64	ldexp(float64 d, int32 e);
+float64	modf(float64 d, float64 *ip);
+void	semacquire(uint32*);
+void	semrelease(uint32*);
diff --git a/src/runtime/sema.c b/src/runtime/sema.c
index e4309f079..cad08d167 100644
--- a/src/runtime/sema.c
+++ b/src/runtime/sema.c
@@ -133,11 +133,10 @@ cansemacquire(uint32 *addr)
 	return 0;
 }
 
-// func sync.semacquire(addr *uint32)
 // For now has no return value.
 // Might return an ok (not interrupted) bool in the future?
 void
-sync·semacquire(uint32 *addr)
+semacquire(uint32 *addr)
 {
 	Sema s;
 
@@ -163,9 +162,8 @@ sync·semacquire(uint32 *addr)
 	semwakeup(addr);
 }
 
-// func sync.semrelease(addr *uint32)
 void
-sync·semrelease(uint32 *addr)
+semrelease(uint32 *addr)
 {
 	uint32 v;
 
diff --git a/src/runtime/sema_go.cgo b/src/runtime/sema_go.cgo
new file mode 100644
index 000000000..eb4082a0d
--- /dev/null
+++ b/src/runtime/sema_go.cgo
@@ -0,0 +1,15 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sync
+#include "runtime.h"
+
+func semacquire(addr *uint32) {
+	semacquire(addr);
+}
+
+func semrelease(addr *uint32) {
+	semrelease(addr);
+}
+