move things out of sys into os and runtime

R=r
OCL=28569
CL=28573

36 files changed, 132 insertions, 112 deletions

diff --git a/src/cmd/gc/Makefile b/src/cmd/gc/Makefile
index 0fc15deaa8..0083240e46 100644
--- a/src/cmd/gc/Makefile
+++ b/src/cmd/gc/Makefile
@@ -44,7 +44,7 @@ y.tab.h: $(YFILES)
 y.tab.c: y.tab.h
 	test -f y.tab.c && touch y.tab.c
 
-builtin.c:	sys.go unsafe.go mkbuiltin1.c mkbuiltin
+builtin.c:	sys.go unsafe.go runtime.go mkbuiltin1.c mkbuiltin
 	./mkbuiltin >builtin.c || \
 	(echo 'mkbuiltin failed; using bootstrap copy of builtin.c'; cp builtin.c.boot builtin.c)
 
diff --git a/src/cmd/gc/builtin.c.boot b/src/cmd/gc/builtin.c.boot
index 0f189d3634..8657944b56 100644
--- a/src/cmd/gc/builtin.c.boot
+++ b/src/cmd/gc/builtin.c.boot
@@ -55,13 +55,6 @@ char *sysimport =
 	"func sys.arrayslices (old *any, nel int, lb int, hb int, width int) (ary []any)\n"
 	"func sys.arrays2d (old *any, nel int) (ary []any)\n"
 	"func sys.closure ()\n"
-	"func sys.Breakpoint ()\n"
-	"var sys.Args []string\n"
-	"var sys.Envs []string\n"
-	"func sys.Gosched ()\n"
-	"func sys.Goexit ()\n"
-	"func sys.Exit (? int)\n"
-	"func sys.Caller (n int) (pc uint64, file string, line int, ok bool)\n"
 	"\n"
 	"$$\n";
 char *unsafeimport =
@@ -74,3 +67,11 @@ char *unsafeimport =
 	"func unsafe.Unreflect (? uint64, ? string, ? bool) (ret interface { })\n"
 	"\n"
 	"$$\n";
+char *runtimeimport =
+	"package runtime\n"
+	"func runtime.Breakpoint ()\n"
+	"func runtime.Gosched ()\n"
+	"func runtime.Goexit ()\n"
+	"func runtime.Caller (n int) (pc uint64, file string, line int, ok bool)\n"
+	"\n"
+	"$$\n";
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index a74dd645c2..29e2fd64ba 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -541,6 +541,7 @@ EXTERN	Sym*	pkgimportname;	// package name from imported package
 EXTERN	int	tptr;		// either TPTR32 or TPTR64
 extern	char*	sysimport;
 extern	char*	unsafeimport;
+extern	char*	runtimeimport;
 EXTERN	char*	filename;	// name to uniqify names
 EXTERN	Idir*	idirs;
 
diff --git a/src/cmd/gc/lex.c b/src/cmd/gc/lex.c
index b84d91ba74..e5edf50513 100644
--- a/src/cmd/gc/lex.c
+++ b/src/cmd/gc/lex.c
@@ -265,6 +265,10 @@ importfile(Val *f)
 		cannedimports("unsafe.6", unsafeimport);
 		return;
 	}
+	if(strcmp(f->u.sval->s, "runtime") == 0) {
+		cannedimports("runtime.6", runtimeimport);
+		return;
+	}
 
 	if(!findpkg(f->u.sval))
 		fatal("can't find import: %Z", f->u.sval);
diff --git a/src/cmd/gc/mkbuiltin b/src/cmd/gc/mkbuiltin
index e0c29c1bb4..b0cb634f50 100755
--- a/src/cmd/gc/mkbuiltin
+++ b/src/cmd/gc/mkbuiltin
@@ -5,11 +5,12 @@
 
 set -e
 gcc -o mkbuiltin1 mkbuiltin1.c
-6g sys.go
-6g unsafe.go
 rm -f _builtin.c
-./mkbuiltin1 sys >_builtin.c
-./mkbuiltin1 unsafe >>_builtin.c
+for i in sys unsafe runtime
+do
+	6g $i.go
+	./mkbuiltin1 $i >>_builtin.c
+done
 
 # If _builtin.c has changed vs builtin.c.boot,
 # check in the new change if being run by
diff --git a/src/cmd/gc/runtime.go b/src/cmd/gc/runtime.go
new file mode 100644
index 0000000000..6b9722ac55
--- /dev/null
+++ b/src/cmd/gc/runtime.go
@@ -0,0 +1,9 @@
+// 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 PACKAGE
+func	Breakpoint();
+func	Gosched();
+func	Goexit();
+func	Caller(n int) (pc uint64, file string, line int, ok bool);
diff --git a/src/cmd/gc/sys.go b/src/cmd/gc/sys.go
index f77771a09d..67fbb0391d 100644
--- a/src/cmd/gc/sys.go
+++ b/src/cmd/gc/sys.go
@@ -72,17 +72,3 @@ func	arrayslices(old *any, nel int, lb int, hb int, width int) (ary []any);
 func	arrays2d(old *any, nel int) (ary []any);
 
 func	closure();	// has args, but compiler fills in
-
-// used by go programs
-
-func	Breakpoint();
-
-var	Args []string;
-var	Envs []string;
-
-func	Gosched();
-func	Goexit();
-
-func	Exit(int);
-
-func	Caller(n int) (pc uint64, file string, line int, ok bool);
diff --git a/src/cmd/gobuild/gobuild.go b/src/cmd/gobuild/gobuild.go
index 9324e98ff4..0db9bca042 100644
--- a/src/cmd/gobuild/gobuild.go
+++ b/src/cmd/gobuild/gobuild.go
@@ -131,7 +131,7 @@ func ScanFiles(filenames []string) *Info {
 	// TODO(rsc): Build a binary from package main?
 
 	z := new(Info);
-	z.Args = sys.Args;
+	z.Args = os.Args;
 	z.Dir = PkgDir();
 	z.Char = theChar;	// for template
 	z.ObjDir = ObjDir;	// for template
diff --git a/src/cmd/gobuild/util.go b/src/cmd/gobuild/util.go
index 34351cea82..be50ba1cab 100644
--- a/src/cmd/gobuild/util.go
+++ b/src/cmd/gobuild/util.go
@@ -34,7 +34,7 @@ const ObjDir = "_obj"
 
 func fatal(args ...) {
 	fmt.Fprintf(os.Stderr, "gobuild: %s\n", fmt.Sprint(args));
-	sys.Exit(1);
+	os.Exit(1);
 }
 
 func init() {
diff --git a/src/lib/flag/flag.go b/src/lib/flag/flag.go
index e66238f6dd..63d649a9bd 100644
--- a/src/lib/flag/flag.go
+++ b/src/lib/flag/flag.go
@@ -261,15 +261,15 @@ func PrintDefaults() {
 }
 
 // Usage prints to standard error a default usage message documenting all defined flags and
-// then calls sys.Exit(1).
+// then calls os.Exit(1).
 func Usage() {
-	if len(sys.Args) > 0 {
-		fmt.Fprintln(os.Stderr, "Usage of", sys.Args[0] + ":");
+	if len(os.Args) > 0 {
+		fmt.Fprintln(os.Stderr, "Usage of", os.Args[0] + ":");
 	} else {
 		fmt.Fprintln(os.Stderr, "Usage:");
 	}
 	PrintDefaults();
-	sys.Exit(1);
+	os.Exit(1);
 }
 
 func NFlag() int {
@@ -280,20 +280,20 @@ func NFlag() int {
 // after flags have been processed.
 func Arg(i int) string {
 	i += flags.first_arg;
-	if i < 0 || i >= len(sys.Args) {
+	if i < 0 || i >= len(os.Args) {
 		return "";
 	}
-	return sys.Args[i]
+	return os.Args[i]
 }
 
 // NArg is the number of arguments remaining after flags have been processed.
 func NArg() int {
-	return len(sys.Args) - flags.first_arg
+	return len(os.Args) - flags.first_arg
 }
 
 // Args returns the non-flag command-line arguments.
 func Args() []string {
-	return sys.Args[flags.first_arg:len(sys.Args)];
+	return os.Args[flags.first_arg:len(os.Args)];
 }
 
 func add(name string, value FlagValue, usage string) {
@@ -393,7 +393,7 @@ func String(name, value string, usage string) *string {
 
 func (f *allFlags) parseOne(index int) (ok bool, next int)
 {
-	s := sys.Args[index];
+	s := os.Args[index];
 	f.first_arg = index;  // until proven otherwise
 	if len(s) == 0 {
 		return false, -1
@@ -450,11 +450,11 @@ func (f *allFlags) parseOne(index int) (ok bool, next int)
 		}
 	} else {
 		// It must have a value, which might be the next argument.
-		if !has_value && index < len(sys.Args)-1 {
+		if !has_value && index < len(os.Args)-1 {
 			// value is the next arg
 			has_value = true;
 			index++;
-			value = sys.Args[index];
+			value = os.Args[index];
 		}
 		if !has_value {
 			print("flag needs an argument: -", name, "\n");
@@ -473,7 +473,7 @@ func (f *allFlags) parseOne(index int) (ok bool, next int)
 // Parse parses the command-line flags.  Must be called after all flags are defined
 // and before any are accessed by the program.
 func Parse() {
-	for i := 1; i < len(sys.Args); {
+	for i := 1; i < len(os.Args); {
 		ok, next := flags.parseOne(i);
 		if next > 0 {
 			flags.first_arg = next;
diff --git a/src/lib/http/triv.go b/src/lib/http/triv.go
index d2e074d73d..f8b59ebeab 100644
--- a/src/lib/http/triv.go
+++ b/src/lib/http/triv.go
@@ -74,7 +74,7 @@ func FlagServer(c *http.Conn, req *http.Request) {
 
 // simple argument server
 func ArgServer(c *http.Conn, req *http.Request) {
-	for i, s := range sys.Args {
+	for i, s := range os.Args {
 		fmt.Fprint(c, s, " ");
 	}
 }
diff --git a/src/lib/log/log.go b/src/lib/log/log.go
index 4a679a839e..f5e4dd4a9a 100644
--- a/src/lib/log/log.go
+++ b/src/lib/log/log.go
@@ -14,6 +14,7 @@ package log
 import (
 	"fmt";
 	"io";
+	"runtime";
 	"os";
 	"time";
 )
@@ -96,7 +97,7 @@ func (l *Logger) formatHeader(ns int64, calldepth int) string {
 		}
 	}
 	if l.flag & (Lshortfile | Llongfile) != 0 {
-		pc, file, line, ok := sys.Caller(calldepth);
+		pc, file, line, ok := runtime.Caller(calldepth);
 		if ok {
 			if l.flag & Lshortfile != 0 {
 				short, ok := shortnames[file];
@@ -139,7 +140,7 @@ func (l *Logger) Output(calldepth int, s string) {
 	case Lcrash:
 		panic("log: fatal error");
 	case Lexit:
-		sys.Exit(1);
+		os.Exit(1);
 	}
 }
 
@@ -173,12 +174,12 @@ func Stderrf(format string, v ...) {
 	stderr.Output(2, fmt.Sprintf(format, v))
 }
 
-// Exit is equivalent to Stderr() followed by a call to sys.Exit(1).
+// Exit is equivalent to Stderr() followed by a call to os.Exit(1).
 func Exit(v ...) {
 	exit.Output(2, fmt.Sprintln(v))
 }
 
-// Exitf is equivalent to Stderrf() followed by a call to sys.Exit(1).
+// Exitf is equivalent to Stderrf() followed by a call to os.Exit(1).
 func Exitf(format string, v ...) {
 	exit.Output(2, fmt.Sprintf(format, v))
 }
diff --git a/src/lib/os/Makefile b/src/lib/os/Makefile
index b563da3f3e..e7b49e5b99 100644
--- a/src/lib/os/Makefile
+++ b/src/lib/os/Makefile
@@ -3,7 +3,7 @@
 # license that can be found in the LICENSE file.
 
 # DO NOT EDIT.  Automatically generated by gobuild.
-# gobuild -m dir_${GOARCH}_${GOOS}.go env.go error.go file.go stat_${GOARCH}_${GOOS}.go time.go types.go exec.go >Makefile
+# gobuild -m dir_${GOARCH}_${GOOS}.go env.go error.go file.go proc.go stat_${GOARCH}_${GOOS}.go time.go types.go exec.go >Makefile
 
 D=
 
@@ -41,6 +41,7 @@ coverage: packages
 
 O1=\
 	error.$O\
+	proc.$O\
 	types.$O\
 
 O2=\
@@ -60,7 +61,7 @@ phases: a1 a2 a3 a4
 _obj$D/os.a: phases
 
 a1: $(O1)
-	$(AR) grc _obj$D/os.a error.$O types.$O
+	$(AR) grc _obj$D/os.a error.$O proc.$O types.$O
 	rm -f $(O1)
 
 a2: $(O2)
diff --git a/src/lib/os/env.go b/src/lib/os/env.go
index e7df309e03..7487504130 100644
--- a/src/lib/os/env.go
+++ b/src/lib/os/env.go
@@ -19,7 +19,7 @@ var env map[string] string;
 
 func copyenv() {
 	env = make(map[string] string);
-	for i, s := range sys.Envs {
+	for i, s := range os.Envs {
 		for j := 0; j < len(s); j++ {
 			if s[j] == '=' {
 				env[s[0:j]] = s[j+1:len(s)];
diff --git a/src/lib/os/file.go b/src/lib/os/file.go
index fa1784a426..9b22a896db 100644
--- a/src/lib/os/file.go
+++ b/src/lib/os/file.go
@@ -132,7 +132,7 @@ func (file *File) Write(b []byte) (ret int, err Error) {
 	if e == syscall.EPIPE {
 		file.nepipe++;
 		if file.nepipe >= 10 {
-			sys.Exit(syscall.EPIPE);
+			os.Exit(syscall.EPIPE);
 		}
 	} else {
 		file.nepipe = 0;
diff --git a/src/lib/regexp/regexp.go b/src/lib/regexp/regexp.go
index 135dcc368a..8cbd380352 100644
--- a/src/lib/regexp/regexp.go
+++ b/src/lib/regexp/regexp.go
@@ -25,6 +25,7 @@ package regexp
 import (
 	"container/vector";
 	"os";
+	"runtime";
 	"utf8";
 )
 
@@ -236,7 +237,7 @@ func (nop *_Nop) print() { print("nop") }
 func (re *Regexp) setError(err os.Error) {
 	re.error = err;
 	re.ch <- re;
-	sys.Goexit();
+	runtime.Goexit();
 }
 
 func (re *Regexp) add(i instr) instr {
diff --git a/src/lib/template/template.go b/src/lib/template/template.go
index b886b31813..182a85b426 100644
--- a/src/lib/template/template.go
+++ b/src/lib/template/template.go
@@ -44,7 +44,7 @@
 	first looked for in the cursor, as in .section and .repeated.
 	If it is not found, the search continues in outer sections
 	until the top level is reached.
-	
+
 	If a formatter is specified, it must be named in the formatter
 	map passed to the template set up routines or in the default
 	set ("html","str","") and is used to process the data for
@@ -61,6 +61,7 @@ import (
 	"io";
 	"os";
 	"reflect";
+	"runtime";
 	"strings";
 	"template";
 	"container/vector";
@@ -181,7 +182,7 @@ func New(fmap FormatterMap) *Template {
 // Generic error handler, called only from execError or parseError.
 func error(errors chan os.Error, line int, err string, args ...) {
 	errors <- ParseError{fmt.Sprintf("line %d: %s", line, fmt.Sprintf(err, args))};
-	sys.Goexit();
+	runtime.Goexit();
 }
 
 // Report error and stop executing.  The line number must  be provided explicitly.
diff --git a/src/lib/testing/testing.go b/src/lib/testing/testing.go
index 2f717d0e97..63e4af5e9a 100644
--- a/src/lib/testing/testing.go
+++ b/src/lib/testing/testing.go
@@ -14,6 +14,8 @@ package testing
 import (
 	"flag";
 	"fmt";
+	"os";
+	"runtime";
 )
 
 // Report as tests are run; default is silent for success.
@@ -47,7 +49,7 @@ func (t *T) Fail() {
 func (t *T) FailNow() {
 	t.Fail();
 	t.ch <- t;
-	sys.Goexit();
+	runtime.Goexit();
 }
 
 // Log formats its arguments using default formatting, analogous to Print(),
@@ -129,7 +131,7 @@ func Main(tests []Test) {
 	}
 	if !ok {
 		println("FAIL");
-		sys.Exit(1);
+		os.Exit(1);
 	}
 	println("PASS");
 }
diff --git a/src/runtime/386/asm.s b/src/runtime/386/asm.s
index 3ef8d8e47c..9dd9c11a98 100644
--- a/src/runtime/386/asm.s
+++ b/src/runtime/386/asm.s
@@ -84,12 +84,12 @@ TEXT mainstart(SB),7,$0
 	CALL	initdone(SB)
 	CALL	main·main(SB)
 	PUSHL	$0
-	CALL	sys·Exit(SB)
+	CALL	exit(SB)
 	POPL	AX
 	INT $3
 	RET
 
-TEXT	sys·Breakpoint(SB),7,$0
+TEXT	breakpoint(SB),7,$0
 	BYTE $0xcc
 	RET
 
diff --git a/src/runtime/386/traceback.c b/src/runtime/386/traceback.c
index b60512ab19..23e92d8926 100644
--- a/src/runtime/386/traceback.c
+++ b/src/runtime/386/traceback.c
@@ -82,7 +82,7 @@ traceback(byte *pc0, byte *sp, G *g)
 
 // func caller(n int) (pc uint64, file string, line int, ok bool)
 void
-sys·Caller(int32 n, uint64 retpc, string retfile, int32 retline, bool retbool)
+runtime·Caller(int32 n, uint64 retpc, string retfile, int32 retline, bool retbool)
 {
 	uint64 pc;
 	byte *sp;
diff --git a/src/runtime/amd64/asm.s b/src/runtime/amd64/asm.s
index cad656e70f..b69259e314 100644
--- a/src/runtime/amd64/asm.s
+++ b/src/runtime/amd64/asm.s
@@ -55,12 +55,12 @@ TEXT mainstart(SB),7,$0
 	CALL	initdone(SB)
 	CALL	main·main(SB)
 	PUSHQ	$0
-	CALL	sys·Exit(SB)
+	CALL	exit(SB)
 	POPQ	AX
 	CALL	notok(SB)
 	RET
 
-TEXT	sys·Breakpoint(SB),7,$0
+TEXT	breakpoint(SB),7,$0
 	BYTE	$0xcc
 	RET
 
diff --git a/src/runtime/amd64/traceback.c b/src/runtime/amd64/traceback.c
index 2e237a21fa..16d7bed72e 100644
--- a/src/runtime/amd64/traceback.c
+++ b/src/runtime/amd64/traceback.c
@@ -79,7 +79,7 @@ traceback(byte *pc0, byte *sp, G *g)
 
 // func caller(n int) (pc uint64, file string, line int, ok bool)
 void
-sys·Caller(int32 n, uint64 retpc, String retfile, int32 retline, bool retbool)
+runtime·Caller(int32 n, uint64 retpc, String retfile, int32 retline, bool retbool)
 {
 	uint64 pc;
 	byte *sp;
diff --git a/src/runtime/chan.c b/src/runtime/chan.c
index 59ac78d79c..be65bcbc16 100644
--- a/src/runtime/chan.c
+++ b/src/runtime/chan.c
@@ -211,7 +211,7 @@ loop:
 	g->status = Gwaiting;
 	enqueue(&c->sendq, sg);
 	unlock(&chanlock);
-	sys·Gosched();
+	gosched();
 
 	lock(&chanlock);
 	sg = g->param;
@@ -237,7 +237,7 @@ asynch:
 		g->status = Gwaiting;
 		enqueue(&c->sendq, sg);
 		unlock(&chanlock);
-		sys·Gosched();
+		gosched();
 
 		lock(&chanlock);
 		goto asynch;
@@ -311,7 +311,7 @@ loop:
 	g->status = Gwaiting;
 	enqueue(&c->recvq, sg);
 	unlock(&chanlock);
-	sys·Gosched();
+	gosched();
 
 	lock(&chanlock);
 	sg = g->param;
@@ -339,7 +339,7 @@ asynch:
 		g->status = Gwaiting;
 		enqueue(&c->recvq, sg);
 		unlock(&chanlock);
-		sys·Gosched();
+		gosched();
 
 		lock(&chanlock);
 		goto asynch;
@@ -748,7 +748,7 @@ loop:
 	g->param = nil;
 	g->status = Gwaiting;
 	unlock(&chanlock);
-	sys·Gosched();
+	gosched();
 
 	lock(&chanlock);
 	sg = g->param;
diff --git a/src/runtime/darwin/386/signal.c b/src/runtime/darwin/386/signal.c
index a6c782294f..3a63c4b382 100644
--- a/src/runtime/darwin/386/signal.c
+++ b/src/runtime/darwin/386/signal.c
@@ -33,7 +33,7 @@ sighandler(int32 sig, Siginfo *info, void *context)
 	Regs *r;
 
 	if(panicking)	// traceback already printed
-		sys_Exit(2);
+		exit(2);
 	panicking = 1;
 
 	if(sig < 0 || sig >= NSIG){
@@ -56,8 +56,8 @@ sighandler(int32 sig, Siginfo *info, void *context)
 		dumpregs(r);
 	}
 
-	sys·Breakpoint();
-	sys_Exit(2);
+	breakpoint();
+	exit(2);
 }
 
 void
diff --git a/src/runtime/darwin/386/sys.s b/src/runtime/darwin/386/sys.s
index 93dd4e300b..1ad6d2aceb 100644
--- a/src/runtime/darwin/386/sys.s
+++ b/src/runtime/darwin/386/sys.s
@@ -11,7 +11,7 @@ TEXT notok(SB),7,$0
 	RET
 
 // Exit the entire program (like C exit)
-TEXT sys·Exit(SB),7,$0
+TEXT exit(SB),7,$0
 	MOVL	$1, AX
 	INT	$0x80
 	CALL	notok(SB)
diff --git a/src/runtime/darwin/amd64/signal.c b/src/runtime/darwin/amd64/signal.c
index 88cddeb00d..45e5e8d478 100644
--- a/src/runtime/darwin/amd64/signal.c
+++ b/src/runtime/darwin/amd64/signal.c
@@ -41,7 +41,7 @@ sighandler(int32 sig, Siginfo *info, void *context)
 	Regs *r;
 
 	if(panicking)	// traceback already printed
-		sys_Exit(2);
+		exit(2);
 	panicking = 1;
 
 	if(sig < 0 || sig >= NSIG){
@@ -64,8 +64,8 @@ sighandler(int32 sig, Siginfo *info, void *context)
 		dumpregs(r);
 	}
 
-	sys·Breakpoint();
-	sys_Exit(2);
+	breakpoint();
+	exit(2);
 }
 
 void
diff --git a/src/runtime/darwin/amd64/sys.s b/src/runtime/darwin/amd64/sys.s
index e16983346d..4238cd1858 100644
--- a/src/runtime/darwin/amd64/sys.s
+++ b/src/runtime/darwin/amd64/sys.s
@@ -9,7 +9,7 @@
 //
 
 // Exit the entire program (like C exit)
-TEXT	sys·Exit(SB),7,$-8
+TEXT	exit(SB),7,$-8
 	MOVL	8(SP), DI		// arg 1 exit status
 	MOVL	$(0x2000000+1), AX	// syscall entry
 	SYSCALL
diff --git a/src/runtime/linux/386/signal.c b/src/runtime/linux/386/signal.c
index 9cbd9fa855..7dfca6bb40 100644
--- a/src/runtime/linux/386/signal.c
+++ b/src/runtime/linux/386/signal.c
@@ -40,7 +40,7 @@ sighandler(int32 sig, Siginfo* info, void* context)
 	Sigcontext *sc;
 
 	if(panicking)	// traceback already printed
-		sys_Exit(2);
+		exit(2);
 	panicking = 1;
 
 	uc = context;
@@ -61,8 +61,8 @@ sighandler(int32 sig, Siginfo* info, void* context)
 		dumpregs(sc);
 	}
 
-	sys·Breakpoint();
-	sys_Exit(2);
+	breakpoint();
+	exit(2);
 }
 
 void
diff --git a/src/runtime/linux/386/sys.s b/src/runtime/linux/386/sys.s
index 379d153e4c..419973a5ca 100755
--- a/src/runtime/linux/386/sys.s
+++ b/src/runtime/linux/386/sys.s
@@ -20,7 +20,7 @@ TEXT syscall(SB),7,$0
 	INT $3	// not reached
 	RET
 
-TEXT sys·Exit(SB),7,$0
+TEXT exit(SB),7,$0
 	MOVL	$252, AX	// syscall number
 	MOVL	4(SP), BX
 	INT	$0x80
diff --git a/src/runtime/linux/amd64/signal.c b/src/runtime/linux/amd64/signal.c
index 5f3574f8e2..55215176de 100644
--- a/src/runtime/linux/amd64/signal.c
+++ b/src/runtime/linux/amd64/signal.c
@@ -49,7 +49,7 @@ sighandler(int32 sig, Siginfo* info, void* context)
 	Sigcontext *sc;
 
 	if(panicking)	// traceback already printed
-		sys_Exit(2);
+		exit(2);
 	panicking = 1;
 
 	uc = context;
@@ -71,8 +71,8 @@ sighandler(int32 sig, Siginfo* info, void* context)
 		dumpregs(sc);
 	}
 
-	sys·Breakpoint();
-	sys_Exit(2);
+	breakpoint();
+	exit(2);
 }
 
 void
diff --git a/src/runtime/linux/amd64/sys.s b/src/runtime/linux/amd64/sys.s
index 5c4d98f973..f90c704faf 100644
--- a/src/runtime/linux/amd64/sys.s
+++ b/src/runtime/linux/amd64/sys.s
@@ -6,7 +6,7 @@
 // System calls and other sys.stuff for AMD64, Linux
 //
 
-TEXT	sys·Exit(SB),7,$0-8
+TEXT	exit(SB),7,$0-8
 	MOVL	8(SP), DI
 	MOVL	$231, AX	// exitgroup - force all os threads to exi
 	SYSCALL
diff --git a/src/runtime/proc.c b/src/runtime/proc.c
index 3875916e77..d52adf94c0 100644
--- a/src/runtime/proc.c
+++ b/src/runtime/proc.c
@@ -129,7 +129,7 @@ initdone(void)
 }
 
 void
-sys·Goexit(void)
+goexit(void)
 {
 	if(debug > 1){
 		lock(&debuglock);
@@ -137,7 +137,7 @@ sys·Goexit(void)
 		unlock(&debuglock);
 	}
 	g->status = Gmoribund;
-	sys·Gosched();
+	gosched();
 }
 
 void
@@ -431,7 +431,7 @@ scheduler(void)
 		case Gmoribund:
 			gp->status = Gdead;
 			if(--sched.gcount == 0)
-				sys_Exit(0);
+				exit(0);
 			break;
 		}
 		if(gp->readyonstop){
@@ -461,7 +461,7 @@ scheduler(void)
 // before running g again.  If g->status is Gmoribund,
 // kills off g.
 void
-sys·Gosched(void)
+gosched(void)
 {
 	if(g == m->g0)
 		throw("gosched of g0");
@@ -529,7 +529,7 @@ sys·exitsyscall(void)
 	// The scheduler will ready g and put this m to sleep.
 	// When the scheduler takes g awa from m,
 	// it will undo the sched.mcpu++ above.
-	sys·Gosched();
+	gosched();
 }
 
 /*
@@ -784,7 +784,7 @@ sys·newproc(int32 siz, byte* fn, byte* arg0)
 	mcpy(sp, (byte*)&arg0, siz);
 
 	sp -= sizeof(uintptr);
-	*(byte**)sp = (byte*)sys·Goexit;
+	*(byte**)sp = (byte*)goexit;
 
 	sp -= sizeof(uintptr);	// retpc used by gogo
 	newg->sched.SP = sp;
@@ -839,3 +839,21 @@ sys·deferreturn(int32 arg0)
 	jmpdefer(sp);
 }
 
+void
+runtime·Breakpoint(void)
+{
+	breakpoint();
+}
+
+void
+runtime·Goexit(void)
+{
+	goexit();
+}
+
+void
+runtime·Gosched(void)
+{
+	gosched();
+}
+
diff --git a/src/runtime/runtime.c b/src/runtime/runtime.c
index e05563bd6e..afb9cce172 100644
--- a/src/runtime/runtime.c
+++ b/src/runtime/runtime.c
@@ -25,7 +25,7 @@ sys·panicl(int32 lno)
 
 	if(panicking) {
 		printf("double panic\n");
-		sys_Exit(3);
+		exit(3);
 	}
 	panicking++;
 
@@ -35,8 +35,8 @@ sys·panicl(int32 lno)
 		traceback(sys·getcallerpc(&lno), sp, g);
 		tracebackothers(g);
 	}
-	sys·Breakpoint();  // so we can grab it in a debugger
-	sys_Exit(2);
+	breakpoint();  // so we can grab it in a debugger
+	exit(2);
 }
 
 void
@@ -57,7 +57,7 @@ throw(int8 *s)
 	printf("throw: %s\n", s);
 	sys·panicl(-1);
 	*(int32*)0 = 0;	// not reached
-	sys_Exit(1);	// even more not reached
+	exit(1);	// even more not reached
 }
 
 void
@@ -136,8 +136,8 @@ rnd(uint32 n, uint32 m)
 static int32	argc;
 static uint8**	argv;
 
-Array sys·Args;
-Array sys·Envs;
+Array os·Args;
+Array os·Envs;
 
 void
 args(int32 c, uint8 **v)
@@ -161,15 +161,15 @@ goargs(void)
 
 	for(i=0; i<argc; i++)
 		gargv[i] = gostring(argv[i]);
-	sys·Args.array = (byte*)gargv;
-	sys·Args.nel = argc;
-	sys·Args.cap = argc;
+	os·Args.array = (byte*)gargv;
+	os·Args.nel = argc;
+	os·Args.cap = argc;
 
 	for(i=0; i<envc; i++)
 		genvv[i] = gostring(argv[argc+1+i]);
-	sys·Envs.array = (byte*)genvv;
-	sys·Envs.nel = envc;
-	sys·Envs.cap = envc;
+	os·Envs.array = (byte*)genvv;
+	os·Envs.nel = envc;
+	os·Envs.cap = envc;
 }
 
 byte*
@@ -182,8 +182,8 @@ getenv(int8 *s)
 
 	bs = (byte*)s;
 	len = findnull(bs);
-	envv = (String*)sys·Envs.array;
-	envc = sys·Envs.nel;
+	envv = (String*)os·Envs.array;
+	envc = os·Envs.nel;
 	for(i=0; i<envc; i++){
 		if(envv[i].len <= len)
 			continue;
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 6b398c2bfa..68d3748f37 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -329,6 +329,10 @@ uint32	noequal(uint32, void*, void*);
 void*	malloc(uintptr size);
 void*	mallocgc(uintptr size);
 void	free(void *v);
+void	exit(int32);
+void	breakpoint(void);
+void	gosched(void);
+void	goexit(void);
 
 #pragma	varargck	argpos	printf	1
 
@@ -378,15 +382,11 @@ void	notewakeup(Note*);
  * UTF-8 characters in identifiers.
  */
 #ifndef __GNUC__
-#define sys_Exit sys·Exit
-#define sys_Gosched sys·Gosched
 #define sys_memclr sys·memclr
 #define sys_write sys·write
-#define sys_Breakpoint sys·Breakpoint
 #define sys_catstring sys·catstring
 #define sys_cmpstring sys·cmpstring
 #define sys_getcallerpc sys·getcallerpc
-#define sys_Goexit sys·Goexit
 #define sys_indexstring sys·indexstring
 #define sys_intstring sys·intstring
 #define sys_mal sys·mal
@@ -408,11 +408,7 @@ void	notewakeup(Note*);
 /*
  * low level go-called
  */
-void	sys_Goexit(void);
-void	sys_Gosched(void);
-void	sys_Exit(int32);
 void	sys_write(int32, void*, int32);
-void	sys_Breakpoint(void);
 uint8*	sys_mmap(byte*, uint32, int32, int32, int32, uint32);
 void	sys_memclr(byte*, uint32);
 void	sys_setcallerpc(void*, void*);
diff --git a/src/runtime/sema.c b/src/runtime/sema.c
index cad08d1672..5e5b07aa6f 100644
--- a/src/runtime/sema.c
+++ b/src/runtime/sema.c
@@ -119,7 +119,7 @@ semsleep2(Sema *s)
 {
 	USED(s);
 	g->status = Gwaiting;
-	sys·Gosched();
+	gosched();
 }
 
 static int32
diff --git a/src/runtime/string.c b/src/runtime/string.c
index 667828d66e..5e4922a99f 100644
--- a/src/runtime/string.c
+++ b/src/runtime/string.c
@@ -215,8 +215,6 @@ out:
 void
 sys·stringiter2(String s, int32 k, int32 retk, int32 retv)
 {
-	int32 l;
-
 	if(k >= s.len) {
 		// retk=0 is end of iteration
 		retk = 0;