386 library updates

R=r
DELTA=161  (153 added, 0 deleted, 8 changed)
OCL=29802
CL=29809

src/cmd/gotest/gotest

@@ -8,7 +8,13 @@
 # tests.
 # If files are named on the command line, use them instead of test*.go.
 
-O=6
+case "$GOARCH" in
+amd64)	O=6;;
+arm)	O=5;;
+386)	O=8;;
+*)	echo 'unknown $GOARCH' 1>&2
+esac
+
 GC=${GC:-${O}g}
 GL=${GL:-${O}l}
 export GC GL
@@ -43,7 +49,7 @@ x)
 	exit 1
 esac
 
-ofiles=$(echo $gofiles | sed 's/\.go/.6/g')
+ofiles=$(echo $gofiles | sed 's/\.go/.'$O'/g')
 files=$(echo $gofiles | sed 's/\.go//g')
 
 
@@ -60,7 +66,7 @@ do
 done
 
 # They all compile; now generate the code to call them.
-trap "rm -f _testmain.go _testmain.6" 0 1 2 3 14 15
+trap "rm -f _testmain.go _testmain.$O" 0 1 2 3 14 15
 {
 	# package spec
 	echo 'package main'

src/lib/sync/asm_386.s

@@ -0,0 +1,23 @@
+// 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.
+
+// func cas(val *int32, old, new int32) bool
+// Atomically:
+//	if *val == old {
+//		*val = new;
+//		return true;
+//	}else
+//		return false;
+TEXT sync·cas(SB), 7, $0
+	MOVL	4(SP), BX
+	MOVL	8(SP), AX
+	MOVL	12(SP), CX
+	LOCK
+	CMPXCHGL	CX, 0(BX)
+	JZ ok
+	MOVL	$0, 16(SP)
+	RET
+ok:
+	MOVL	$1, 16(SP)
+	RET

src/lib/syscall/Makefile

@@ -48,10 +48,10 @@ O1=\
 
 O2=\
 	errstr.$O\
-	syscall_$(GOOS)_$(GOARCH).$O\
+	zsyscall_$(GOOS)_$(GOARCH).$O\
 
 O3=\
-	zsyscall_$(GOOS)_$(GOARCH).$O\
+	syscall_$(GOOS)_$(GOARCH).$O\
 
 O4=\
 	syscall_$(GOOS).$O\
@@ -68,11 +68,11 @@ a1: $(O1)
 	rm -f $(O1)
 
 a2: $(O2)
-	$(AR) grc _obj$D/syscall.a errstr.$O syscall_$(GOOS)_$(GOARCH).$O
+	$(AR) grc _obj$D/syscall.a errstr.$O zsyscall_$(GOOS)_$(GOARCH).$O
 	rm -f $(O2)
 
 a3: $(O3)
-	$(AR) grc _obj$D/syscall.a zsyscall_$(GOOS)_$(GOARCH).$O
+	$(AR) grc _obj$D/syscall.a syscall_$(GOOS)_$(GOARCH).$O
 	rm -f $(O3)
 
 a4: $(O4)

src/lib/syscall/asm_darwin_386.s

@@ -0,0 +1,83 @@
+// 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.
+
+//
+// System call support for 386, Darwin
+//
+
+// func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
+// func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
+// Trap # in AX, args on stack above caller pc.
+
+TEXT	syscall·Syscall(SB),7,$0
+	CALL	sys·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$0x80
+	JAE	ok
+	MOVL	$-1, 20(SP)	// r1
+	MOVL	$-1, 24(SP)	// r2
+	MOVL	AX, 28(SP)		// errno
+	CALL	sys·exitsyscall(SB)
+	RET
+ok:
+	MOVL	AX, 20(SP)	// r1
+	MOVL	DX, 24(SP)	// r2 ???
+	MOVL	$0, 28(SP)	// errno
+	CALL	sys·exitsyscall(SB)
+	RET
+
+TEXT	syscall·Syscall6(SB),7,$0
+	CALL	sys·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$0x80
+	JAE	ok
+	MOVL	$-1, 32(SP)	// r1
+	MOVL	$-1, 36(SP)	// r2
+	MOVL	AX, 40(SP)		// errno
+	CALL	sys·exitsyscall(SB)
+	RET
+ok6:
+	MOVL	AX, 32(SP)	// r1
+	MOVL	DX, 36(SP)	// r2 ???
+	MOVL	$0, 40(SP)	// errno
+	CALL	sys·exitsyscall(SB)
+	RET
+
+TEXT syscall·RawSyscall(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$0x80
+	JAE	ok1
+	MOVL	$-1, 20(SP)	// r1
+	MOVL	$-1, 24(SP)	// r2
+	MOVL	AX, 28(SP)		// errno
+	RET
+ok1:
+	MOVL	AX, 20(SP)	// r1
+	MOVL	DX, 24(SP)	// r2 ???
+	MOVL	$0, 28(SP)	// errno
+	RET

src/lib/syscall/syscall_darwin_386.go

@@ -0,0 +1,40 @@
+// 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 syscall
+
+import "syscall"
+
+func TimespecToNsec(ts Timespec) int64 {
+	return int64(ts.Sec)*1e9 + int64(ts.Nsec);
+}
+
+func NsecToTimespec(nsec int64) (ts Timespec) {
+	ts.Sec = int32(nsec / 1e9);
+	ts.Nsec = int32(nsec % 1e9);
+	return;
+}
+
+func TimevalToNsec(tv Timeval) int64 {
+	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3;
+}
+
+func NsecToTimeval(nsec int64) (tv Timeval) {
+	nsec += 999;	// round up to microsecond
+	tv.Usec = int32(nsec%1e9 / 1e3);
+	tv.Sec = int32(nsec/1e9);
+	return;
+}
+
+//sys	gettimeofday(tp *Timeval) (sec int64, usec int32, errno int)
+func Gettimeofday(tv *Timeval) (errno int) {
+	// The tv passed to gettimeofday must be non-nil
+	// but is otherwise unused.  The answers come back
+	// in the two registers.
+	sec, usec, err := gettimeofday(tv);
+	tv.Sec = int32(sec);
+	tv.Usec = int32(usec);
+	return err;
+}
+

src/lib/syscall/syscall_darwin_amd64.go

@@ -26,3 +26,15 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 	tv.Sec = int64(nsec/1e9);
 	return;
 }
+
+//sys	gettimeofday(tp *Timeval) (sec int64, usec int32, errno int)
+func Gettimeofday(tv *Timeval) (errno int) {
+	// The tv passed to gettimeofday must be non-nil
+	// but is otherwise unused.  The answers come back
+	// in the two registers.
+	sec, usec, err := gettimeofday(tv);
+	tv.Sec = sec;
+	tv.Usec = usec;
+	return err;
+}
+

src/lib/syscall/types_darwin_386.c

@@ -0,0 +1,5 @@
+// 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.
+
+// Nothing to see here.

src/runtime/mgc0.c

@@ -212,7 +212,7 @@ gc(int32 force)
 		else
 			gcpercent = atoi(p);
 	}
-	if(gcpercent < 0)
+	if(gcpercent < 0 || sizeof(void*) == 4)	// TODO(rsc): broken on 32-bit right now
 		return;
 
 	semacquire(&gcsema);