unix: update generation scripts for arm64/ppc64

This applies the following CLs from the syscall package:
http://golang.org/cl/9962
http://golang.org/cl/9966
http://golang.org/cl/9924

It also adds arm64/ppc64 support to mkall.sh and mksysnum_linux.pl.

Change-Id: I84fbfde2a2876dbf6d16c6159e847195c274b396
Reviewed-on: https://go-review.googlesource.com/10037
Reviewed-by: Rob Pike <r@golang.org>

unix/mkall.sh

@@ -107,6 +107,7 @@ case "$#" in
 	exit 2
 esac
 
+GOOSARCH_in=syscall_$GOOSARCH.go
 case "$GOOSARCH" in
 _* | *_ | _)
 	echo 'undefined $GOOS_$GOARCH:' "$GOOSARCH" 1>&2
@@ -173,7 +174,32 @@ linux_amd64)
 linux_arm)
 	mkerrors="$mkerrors"
 	mksyscall="./mksyscall.pl -l32 -arm"
-	mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl"
+	mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl -"
+	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	;;
+linux_arm64)
+	unistd_h=$(ls -1 /usr/include/asm/unistd.h /usr/include/asm-generic/unistd.h 2>/dev/null | head -1)
+	if [ "$unistd_h" = "" ]; then
+		echo >&2 cannot find unistd_64.h
+		exit 1
+	fi
+	mksysnum="./mksysnum_linux.pl $unistd_h"
+	# Let the type of C char be singed for making the bare syscall
+	# API consistent across over platforms.
+	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
+	;;
+linux_ppc64)
+	GOOSARCH_in=syscall_linux_ppc64x.go
+	unistd_h=/usr/include/asm/unistd.h
+	mkerrors="$mkerrors -m64"
+	mksysnum="./mksysnum_linux.pl $unistd_h"
+	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
+	;;
+linux_ppc64le)
+	GOOSARCH_in=syscall_linux_ppc64x.go
+	unistd_h=/usr/include/powerpc64le-linux-gnu/asm/unistd.h
+	mkerrors="$mkerrors -m64"
+	mksysnum="./mksysnum_linux.pl $unistd_h"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 netbsd_386)
@@ -226,7 +252,7 @@ esac
 			syscall_goos="syscall_bsd.go $syscall_goos"
 			;;
 		esac
-		if [ -n "$mksyscall" ]; then echo "$mksyscall $syscall_goos syscall_$GOOSARCH.go |gofmt >zsyscall_$GOOSARCH.go"; fi
+		if [ -n "$mksyscall" ]; then echo "$mksyscall $syscall_goos $GOOSARCH_in |gofmt >zsyscall_$GOOSARCH.go"; fi
 		;;
 	esac
 	if [ -n "$mksysctl" ]; then echo "$mksysctl |gofmt >$zsysctl"; fi

unix/mkerrors.sh

@@ -88,7 +88,9 @@ includes_FreeBSD='
 includes_Linux='
 #define _LARGEFILE_SOURCE
 #define _LARGEFILE64_SOURCE
+#ifndef __LP64__
 #define _FILE_OFFSET_BITS 64
+#endif
 #define _GNU_SOURCE
 
 #include <bits/sockaddr.h>

unix/mksysnum_linux.pl

@@ -18,13 +18,26 @@ EOF
 
 sub fmt {
 	my ($name, $num) = @_;
+	if($num > 999){
+		# ignore deprecated syscalls that are no longer implemented
+		# https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
+		return;
+	}
 	$name =~ y/a-z/A-Z/;
 	print "	SYS_$name = $num;\n";
 }
 
 my $prev;
-while(<>){
-	if(/^#define __NR_(\w+)\s+([0-9]+)/){
+open(GCC, "gcc -E -dD $ARGV[0] |") || die "can't run gcc";
+while(<GCC>){
+	if(/^#define __NR_syscalls\s+/) {
+		# ignore redefinitions of __NR_syscalls
+	}
+	elsif(/^#define __NR_(\w+)\s+([0-9]+)/){
+		$prev = $2;
+		fmt($1, $2);
+	}
+	elsif(/^#define __NR3264_(\w+)\s+([0-9]+)/){
 		$prev = $2;
 		fmt($1, $2);
 	}