linux 386 support; now in same state as darwin 386

(stuck on 8l bug).

R=r
DELTA=349  (342 added, 1 deleted, 6 changed)
OCL=29882
CL=29886

src/lib/os/dir_linux_386.go

+// 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.
+
+// TODO(rsc): Once the porting dust settles, consider
+// whether this file should be dir_linux.go (and similarly
+// dir_darwin.go) instead of having one copy per architecture.
+
+package os
+
+import (
+	"os";
+	"syscall";
+	"unsafe";
+)
+
+const (
+	blockSize = 4096	// TODO(r): use statfs
+)
+
+func clen(n []byte) int {
+	for i := 0; i < len(n); i++ {
+		if n[i] == 0 {
+			return i
+		}
+	}
+	return len(n)
+}
+
+// Negative count means read until EOF.
+func readdirnames(file *File, count int) (names []string, err Error) {
+	// If this file has no dirinfo, create one.
+	if file.dirinfo == nil {
+		file.dirinfo = new(dirInfo);
+		// The buffer must be at least a block long.
+		// TODO(r): use fstatfs to find fs block size.
+		file.dirinfo.buf = make([]byte, blockSize);
+	}
+	d := file.dirinfo;
+	size := count;
+	if size < 0 {
+		size = 100
+	}
+	names = make([]string, 0, size);	// Empty with room to grow.
+	for count != 0 {
+		// Refill the buffer if necessary
+		if d.bufp >= d.nbuf {
+			var errno int;
+			d.nbuf, errno = syscall.Getdents(file.fd, d.buf);
+			if d.nbuf < 0 {
+				return names, ErrnoToError(errno)
+			}
+			if d.nbuf == 0 {
+				break	// EOF
+			}
+			d.bufp = 0;
+		}
+		// Drain the buffer
+		for count != 0 && d.bufp < d.nbuf {
+			dirent := (*syscall.Dirent)(unsafe.Pointer(&d.buf[d.bufp]));
+			d.bufp += int(dirent.Reclen);
+			if dirent.Ino == 0 {	// File absent in directory.
+				continue
+			}
+			bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]));
+			var name = string(bytes[0:clen(bytes)]);
+			if name == "." || name == ".." {	// Useless names
+				continue
+			}
+			count--;
+			if len(names) == cap(names) {
+				nnames := make([]string, len(names), 2*len(names));
+				for i := 0; i < len(names); i++ {
+					nnames[i] = names[i]
+				}
+				names = nnames;
+			}
+			names = names[0:len(names)+1];
+			names[len(names)-1] = name;
+		}
+	}
+	return names, nil;
+}

src/lib/os/stat_linux_386.go

+// 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.
+
+// TODO(rsc): Once the porting dust settles, consider
+// whether this file should be stat_linux.go (and similarly
+// stat_darwin.go) instead of having one copy per architecture.
+
+// 386, Linux
+
+package os
+
+import (
+	"os";
+	"syscall";
+)
+
+func isSymlink(stat *syscall.Stat_t) bool {
+	return stat.Mode & syscall.S_IFMT == syscall.S_IFLNK
+}
+
+func dirFromStat(name string, dir *Dir, lstat, stat *syscall.Stat_t) *Dir {
+	dir.Dev = stat.Dev;
+	dir.Ino = uint64(stat.Ino);
+	dir.Nlink = uint64(stat.Nlink);
+	dir.Mode = stat.Mode;
+	dir.Uid = stat.Uid;
+	dir.Gid = stat.Gid;
+	dir.Rdev = stat.Rdev;
+	dir.Size = uint64(stat.Size);
+	dir.Blksize = uint64(stat.Blksize);
+	dir.Blocks = uint64(stat.Blocks);
+	dir.Atime_ns = uint64(syscall.TimespecToNsec(stat.Atim));
+	dir.Mtime_ns = uint64(syscall.TimespecToNsec(stat.Mtim));
+	dir.Ctime_ns = uint64(syscall.TimespecToNsec(stat.Ctim));
+	for i := len(name) - 1; i >= 0; i-- {
+		if name[i] == '/' {
+			name = name[i+1:len(name)];
+			break;
+		}
+	}
+	dir.Name = name;
+	if isSymlink(lstat) && !isSymlink(stat) {
+		dir.FollowedSymlink = true;
+	}
+	return dir;
+}

src/lib/syscall/PORT

@@ -99,6 +99,10 @@ darwin_amd64)
 	mktypes="godefs -gsyscall -f-m64"
 	mkerrors="mkerrors"
 	;;
+linux_386)
+	mksysnum="mksysnum_linux /usr/include/asm/unistd_32.h"
+	mktypes="godefs -gsyscall -f-m32"
+	;;
 linux_amd64)
 	mksysnum="mksysnum_linux /usr/include/asm/unistd_64.h"
 	mktypes="godefs -gsyscall -f-m64"

src/lib/syscall/asm_linux_386.s

+// 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 calls for 386, Linux
+//
+
+// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
+// Trap # in AX, args in BX CX DX SI DI, return in AX
+
+TEXT	syscall·Syscall(SB),7,$0
+	CALL	sys·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	MOVL	8(SP), BX
+	MOVL	12(SP), CX
+	MOVL	16(SP), DX
+	MOVL	$0, SI
+	MOVL	$0,  DI
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	ok
+	MOVL	$-1, 20(SP)	// r1
+	MOVL	$0, 24(SP)	// r2
+	NEGL	AX
+	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
+
+// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
+TEXT	syscall·Syscall6(SB),7,$0
+	CALL	sys·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	MOVL	8(SP), BX
+	MOVL	12(SP), CX
+	MOVL	16(SP), DX
+	MOVL	20(SP), SI
+	MOVL	24(SP), DI
+	// 28(SP) is ignored
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	ok6
+	MOVL	$-1, 32(SP)	// r1
+	MOVL	$0, 36(SP)	// r2
+	NEGL	AX
+	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
+	MOVL	8(SP), BX
+	MOVL	12(SP), CX
+	MOVL	16(SP), DX
+	MOVL	$0, SI
+	MOVL	$0,  DI
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	ok1
+	MOVL	$-1, 20(SP)	// r1
+	MOVL	$0, 24(SP)	// r2
+	NEGL	AX
+	MOVL	AX, 28(SP)  // errno
+	CALL	sys·exitsyscall(SB)
+	RET
+ok1:
+	MOVL	AX, 20(SP)	// r1
+	MOVL	DX, 24(SP)	// r2
+	MOVL	$0, 28(SP)	// errno
+	RET
+
+#define SYS_SOCKETCALL 102	/* from zsysnum_linux_386.go */
+
+// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
+// Kernel interface gets call sub-number and pointer to a0.
+TEXT syscall·socketcall(SB),7,$0
+	CALL	sys·entersyscall(SB)
+	MOVL	$SYS_SOCKETCALL, AX	// syscall entry
+	MOVL	4(SP), BX	// socket call number
+	LEAL		8(SP), CX	// pointer to call arguments
+	MOVL	$0, DX
+	MOVL	$0, SI
+	MOVL	$0,  DI
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	oksock
+	MOVL	$-1, 28(SP)	// n
+	NEGL	AX
+	MOVL	AX, 32(SP)  // errno
+	CALL	sys·exitsyscall(SB)
+	RET
+oksock:
+	MOVL	AX, 28(SP)	// n
+	MOVL	$0, 32(SP)	// errno
+	CALL	sys·exitsyscall(SB)
+	RET

src/lib/syscall/syscall_linux.go

@@ -182,12 +182,13 @@ func Sleep(nsec int64) (errno int) {
 	return err;
 }
 
-//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
-//sys	bind(s int, addr uintptr, addrlen _Socklen) (errno int)
-//sys	connect(s int, addr uintptr, addrlen _Socklen) (errno int)
-//sys	socket(domain int, typ int, proto int) (fd int, errno int)
-//sys	setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
-//sys	Listen(s int, n int) (errno int)
+// Implemented in syscall_linux_*.go
+func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
+func bind(s int, addr uintptr, addrlen _Socklen) (errno int)
+func connect(s int, addr uintptr, addrlen _Socklen) (errno int)
+func socket(domain int, typ int, proto int) (fd int, errno int)
+func setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
+func Listen(s int, n int) (errno int)
 
 // For testing: clients can set this flag to force
 // creation of IPv6 sockets to return EAFNOSUPPORT.
@@ -454,7 +455,6 @@ func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
 //sys	Setsid() (pid int)
 //sys	Settimeofday(tv *Timeval) (errno int)
 //sys	Setuid(uid int) (errno int)
-//sys	Shutdown(fd int, how int) (errno int)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int)
 //sys	Statfs(path string, buf *Statfs_t) (errno int)

src/lib/syscall/syscall_linux_386.go

+// 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";
+	"unsafe";
+)
+
+func Getpagesize() int {
+	return 4096
+}
+
+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.Sec = int32(nsec/1e9);
+	tv.Usec = int32(nsec%1e9 / 1e3);
+	return;
+}
+
+// On x86 Linux, all the socket calls go through an extra indirection,
+// I think because the 5-register system call interface can't handle
+// the 6-argument calls like sendto and recvfrom.  Instead the
+// arguments to the underlying system call are the number below
+// and a pointer to an array of uintptr.  We hide the pointer in the
+// socketcall assembly to avoid allocation on every system call.
+
+const (
+	// see linux/net.h
+	_SOCKET = 1;
+	_BIND = 2;
+	_CONNECT = 3;
+	_LISTEN = 4;
+	_ACCEPT = 5;
+	_GETSOCKNAME = 6;
+	_GETPEERNAME = 7;
+	_SOCKETPAIR = 8;
+	_SEND = 9;
+	_RECV = 10;
+	_SENDTO = 11;
+	_RECVFROM = 12;
+	_SHUTDOWN = 13;
+	_SETSOCKOPT = 14;
+	_GETSOCKOPT = 15;
+	_SENDMSG = 16;
+	_RECVMSG = 17;
+)
+
+func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
+
+func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int) {
+	fd, errno = socketcall(_SOCKET, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0);
+	return;
+}
+
+func bind(s int, addr uintptr, addrlen _Socklen) (errno int) {
+	var _ int;
+	_, errno = socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0);
+	return;
+}
+
+func connect(s int, addr uintptr, addrlen _Socklen) (errno int) {
+	var _ int;
+	_, errno = socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0);
+	return;
+}
+
+func socket(domain int, typ int, proto int) (fd int, errno int) {
+	fd, errno = socketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0);
+	return;
+}
+
+func setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int) {
+	var _ int;
+	_, errno = socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(vallen), 0);
+	return;
+}
+
+func Listen(s int, n int) (errno int) {
+	var _ int;
+	_, errno = socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0);
+	return;
+}
+

src/lib/syscall/syscall_linux_amd64.go

@@ -6,6 +6,14 @@ package syscall
 
 import "syscall"
 
+//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
+//sys	bind(s int, addr uintptr, addrlen _Socklen) (errno int)
+//sys	connect(s int, addr uintptr, addrlen _Socklen) (errno int)
+//sys	socket(domain int, typ int, proto int) (fd int, errno int)
+//sys	setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
+//sys	Listen(s int, n int) (errno int)
+//sys	Shutdown(fd int, how int) (errno int)
+
 func Getpagesize() int {
 	return 4096
 }

src/lib/syscall/types_linux_386.c

+// 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