unix: add support for openbsd/ppc64

Updates golang/go#56001

Change-Id: Ic2c7db7a0c2056d3bbc153066c187f27508cb96c
Reviewed-on: https://go-review.googlesource.com/c/sys/+/439978
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

Author: 4a6f656c

unix/asm_bsd_ppc64.s

@@ -0,0 +1,31 @@
+// Copyright 2022 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.
+
+//go:build (darwin || freebsd || netbsd || openbsd) && gc
+// +build darwin freebsd netbsd openbsd
+// +build gc
+
+#include "textflag.h"
+
+//
+// System call support for ppc64, BSD
+//
+
+// Just jump to package syscall's implementation for all these functions.
+// The runtime may know about them.
+
+TEXT	·Syscall(SB),NOSPLIT,$0-56
+	JMP	syscall·Syscall(SB)
+
+TEXT	·Syscall6(SB),NOSPLIT,$0-80
+	JMP	syscall·Syscall6(SB)
+
+TEXT	·Syscall9(SB),NOSPLIT,$0-104
+	JMP	syscall·Syscall9(SB)
+
+TEXT	·RawSyscall(SB),NOSPLIT,$0-56
+	JMP	syscall·RawSyscall(SB)
+
+TEXT	·RawSyscall6(SB),NOSPLIT,$0-80
+	JMP	syscall·RawSyscall6(SB)

unix/mkall.sh

@@ -182,6 +182,15 @@ openbsd_mips64)
 	# API consistent across platforms.
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
 	;;
+openbsd_ppc64)
+	mkasm="go run mkasm.go"
+	mkerrors="$mkerrors -m64"
+	mksyscall="go run mksyscall.go -openbsd -libc"
+	mksysctl="go run mksysctl_openbsd.go"
+	# Let the type of C char be signed for making the bare syscall
+	# API consistent across platforms.
+	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
+	;;
 openbsd_riscv64)
 	mkasm="go run mkasm.go"
 	mkerrors="$mkerrors -m64"

unix/mkasm.go

@@ -23,15 +23,15 @@ func archPtrSize(arch string) int {
 	switch arch {
 	case "386", "arm":
 		return 4
-	case "amd64", "arm64", "mips64", "riscv64":
+	case "amd64", "arm64", "mips64", "ppc64", "riscv64":
 		return 8
 	default:
 		log.Fatalf("Unknown arch %q", arch)
 		return 0
 	}
 }
 
-func generateASMFile(arch string, inFileNames []string, outFileName string) map[string]bool {
+func generateASMFile(goos, arch string, inFileNames []string, outFileName string) map[string]bool {
 	trampolines := map[string]bool{}
 	var orderedTrampolines []string
 	for _, inFileName := range inFileNames {
@@ -62,7 +62,12 @@ func generateASMFile(arch string, inFileNames []string, outFileName string) map[
 	fmt.Fprintf(&out, "#include \"textflag.h\"\n")
 	for _, fn := range orderedTrampolines {
 		fmt.Fprintf(&out, "\nTEXT %s_trampoline<>(SB),NOSPLIT,$0-0\n", fn)
-		fmt.Fprintf(&out, "\tJMP\t%s(SB)\n\n", fn)
+		if goos == "openbsd" && arch == "ppc64" {
+			fmt.Fprintf(&out, "\tCALL\t%s(SB)\n", fn)
+			fmt.Fprintf(&out, "\tRET\n")
+		} else {
+			fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
+		}
 		fmt.Fprintf(&out, "GLOBL\t·%s_trampoline_addr(SB), RODATA, $%d\n", fn, ptrSize)
 		fmt.Fprintf(&out, "DATA\t·%s_trampoline_addr(SB)/%d, $%s_trampoline<>(SB)\n", fn, ptrSize, fn)
 	}
@@ -127,7 +132,7 @@ func main() {
 		zsyscallArchFilename,
 	}
 
-	trampolines := generateASMFile(arch, inFileNames, zsyscallASMFileName)
+	trampolines := generateASMFile(goos, arch, inFileNames, zsyscallASMFileName)
 
 	if goos == "darwin" {
 		writeDarwinTest(trampolines, fmt.Sprintf("darwin_%s_test.go", arch), arch)

unix/syscall_openbsd_ppc64.go

@@ -0,0 +1,42 @@
+// Copyright 2019 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.
+
+//go:build ppc64 && openbsd
+// +build ppc64,openbsd
+
+package unix
+
+func setTimespec(sec, nsec int64) Timespec {
+	return Timespec{Sec: sec, Nsec: nsec}
+}
+
+func setTimeval(sec, usec int64) Timeval {
+	return Timeval{Sec: sec, Usec: usec}
+}
+
+func SetKevent(k *Kevent_t, fd, mode, flags int) {
+	k.Ident = uint64(fd)
+	k.Filter = int16(mode)
+	k.Flags = uint16(flags)
+}
+
+func (iov *Iovec) SetLen(length int) {
+	iov.Len = uint64(length)
+}
+
+func (msghdr *Msghdr) SetControllen(length int) {
+	msghdr.Controllen = uint32(length)
+}
+
+func (msghdr *Msghdr) SetIovlen(length int) {
+	msghdr.Iovlen = uint32(length)
+}
+
+func (cmsg *Cmsghdr) SetLen(length int) {
+	cmsg.Len = uint32(length)
+}
+
+// SYS___SYSCTL is used by syscall_bsd.go for all BSDs, but in modern versions
+// of openbsd/ppc64 the syscall is called sysctl instead of __sysctl.
+const SYS___SYSCTL = SYS_SYSCTL

unix/syscall_unix_gc.go

@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris) && gc && !ppc64le && !ppc64
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build (darwin || dragonfly || freebsd || (linux && !ppc64 && !ppc64le) || netbsd || openbsd || solaris) && gc
+// +build darwin dragonfly freebsd linux,!ppc64,!ppc64le netbsd openbsd solaris
 // +build gc
-// +build !ppc64le
-// +build !ppc64
 
 package unix