syscall, net: Fix GNU/Linux netlink code for big-endian systems.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@186124 138bc75d-0d04-0410-961f-82ee72b054a4

7 files changed, 67 insertions, 21 deletions

diff --git a/libgo/Makefile.am b/libgo/Makefile.am
index 11a650be689..e19cdf0a36d 100644
--- a/libgo/Makefile.am
+++ b/libgo/Makefile.am
@@ -1559,6 +1559,7 @@ s-syscall_arch: Makefile
 	echo "package syscall" > syscall_arch.go.tmp
 	echo 'const ARCH = "'$(GOARCH)'"' >> syscall_arch.go.tmp
 	echo 'const OS = "'$(GOOS)'"' >> syscall_arch.go.tmp
+	echo 'const BigEndian = $(GO_BIGENDIAN)' >> syscall_arch.go.tmp
 	$(SHELL) $(srcdir)/../move-if-change syscall_arch.go.tmp syscall_arch.go
 	$(STAMP) $@
 
diff --git a/libgo/Makefile.in b/libgo/Makefile.in
index f790205bed4..c7740cf80e1 100644
--- a/libgo/Makefile.in
+++ b/libgo/Makefile.in
@@ -369,6 +369,7 @@ GOARCH = @GOARCH@
 GOC = @GOC@
 GOCFLAGS = $(CFLAGS)
 GOOS = @GOOS@
+GO_BIGENDIAN = @GO_BIGENDIAN@
 GO_LIBCALL_OS_ARCH_FILE = @GO_LIBCALL_OS_ARCH_FILE@
 GO_LIBCALL_OS_FILE = @GO_LIBCALL_OS_FILE@
 GO_SYSCALL_OS_ARCH_FILE = @GO_SYSCALL_OS_ARCH_FILE@
@@ -4371,6 +4372,7 @@ s-syscall_arch: Makefile
 	echo "package syscall" > syscall_arch.go.tmp
 	echo 'const ARCH = "'$(GOARCH)'"' >> syscall_arch.go.tmp
 	echo 'const OS = "'$(GOOS)'"' >> syscall_arch.go.tmp
+	echo 'const BigEndian = $(GO_BIGENDIAN)' >> syscall_arch.go.tmp
 	$(SHELL) $(srcdir)/../move-if-change syscall_arch.go.tmp syscall_arch.go
 	$(STAMP) $@
 
diff --git a/libgo/configure b/libgo/configure
index 34125ec144d..b57ba949a39 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -612,6 +612,7 @@ HAVE_STRERROR_R_FALSE
 HAVE_STRERROR_R_TRUE
 HAVE_SYS_MMAN_H_FALSE
 HAVE_SYS_MMAN_H_TRUE
+GO_BIGENDIAN
 PTHREAD_LIBS
 PTHREAD_CFLAGS
 NET_LIBS
@@ -11100,7 +11101,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11103 "configure"
+#line 11104 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11206,7 +11207,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11209 "configure"
+#line 11210 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14408,6 +14409,12 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
  presetting ac_cv_c_bigendian=no (or yes) will help" "$LINENO" 5 ;;
  esac
 
+case $ac_cv_c_bigendian in
+  yes) GO_BIGENDIAN=true ;;
+  no) GO_BIGENDIAN=false ;;
+  *) as_fn_error "unknown endianness" "$LINENO" 5 ;;
+esac
+
 
 
 
diff --git a/libgo/configure.ac b/libgo/configure.ac
index b47d17d015f..8be03911b87 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -400,6 +400,12 @@ dnl Test if -lrt is required for sched_yield.
 AC_SEARCH_LIBS([sched_yield], [rt])
 
 AC_C_BIGENDIAN
+case $ac_cv_c_bigendian in
+  yes) GO_BIGENDIAN=true ;;
+  no) GO_BIGENDIAN=false ;;
+  *) AC_MSG_ERROR([unknown endianness]) ;;
+esac
+AC_SUBST(GO_BIGENDIAN)
 
 GCC_CHECK_UNWIND_GETIPINFO
 
diff --git a/libgo/go/net/interface_linux.go b/libgo/go/net/interface_linux.go
index 825b20227ae..0d7017f301e 100644
--- a/libgo/go/net/interface_linux.go
+++ b/libgo/go/net/interface_linux.go
@@ -64,7 +64,11 @@ func newLink(ifim *syscall.IfInfomsg, attrs []syscall.NetlinkRouteAttr) Interfac
 		case syscall.IFLA_IFNAME:
 			ifi.Name = string(a.Value[:len(a.Value)-1])
 		case syscall.IFLA_MTU:
-			ifi.MTU = int(uint32(a.Value[3])<<24 | uint32(a.Value[2])<<16 | uint32(a.Value[1])<<8 | uint32(a.Value[0]))
+			if syscall.BigEndian {
+				ifi.MTU = int(uint32(a.Value[0])<<24 | uint32(a.Value[1])<<16 | uint32(a.Value[2])<<8 | uint32(a.Value[3]))
+			} else {
+				ifi.MTU = int(uint32(a.Value[3])<<24 | uint32(a.Value[2])<<16 | uint32(a.Value[1])<<8 | uint32(a.Value[0]))
+			}
 		}
 	}
 	return ifi
@@ -196,7 +200,12 @@ func parseProcNetIGMP(path string, ifi *Interface) []Addr {
 				for i := 0; i+1 < len(f[0]); i += 2 {
 					b[i/2], _ = xtoi2(f[0][i:i+2], 0)
 				}
-				ifma := IPAddr{IP: IPv4(b[3], b[2], b[1], b[0])}
+				var ifma IPAddr
+				if syscall.BigEndian {
+					ifma = IPAddr{IP: IPv4(b[0], b[1], b[2], b[3])}
+				} else {
+					ifma = IPAddr{IP: IPv4(b[3], b[2], b[1], b[0])}
+				}
 				ifmat = append(ifmat, ifma.toAddr())
 			}
 		}
diff --git a/libgo/go/syscall/netlink_linux.go b/libgo/go/syscall/netlink_linux.go
index 8683bb3dacb..1c99a81785f 100644
--- a/libgo/go/syscall/netlink_linux.go
+++ b/libgo/go/syscall/netlink_linux.go
@@ -30,23 +30,43 @@ type NetlinkRouteRequest struct {
 
 func (rr *NetlinkRouteRequest) toWireFormat() []byte {
 	b := make([]byte, rr.Header.Len)
-	b[0] = byte(rr.Header.Len)
-	b[1] = byte(rr.Header.Len >> 8)
-	b[2] = byte(rr.Header.Len >> 16)
-	b[3] = byte(rr.Header.Len >> 24)
-	b[4] = byte(rr.Header.Type)
-	b[5] = byte(rr.Header.Type >> 8)
-	b[6] = byte(rr.Header.Flags)
-	b[7] = byte(rr.Header.Flags >> 8)
-	b[8] = byte(rr.Header.Seq)
-	b[9] = byte(rr.Header.Seq >> 8)
-	b[10] = byte(rr.Header.Seq >> 16)
-	b[11] = byte(rr.Header.Seq >> 24)
-	b[12] = byte(rr.Header.Pid)
-	b[13] = byte(rr.Header.Pid >> 8)
-	b[14] = byte(rr.Header.Pid >> 16)
-	b[15] = byte(rr.Header.Pid >> 24)
-	b[16] = byte(rr.Data.Family)
+	if BigEndian {
+		b[0] = byte(rr.Header.Len >> 24)
+		b[1] = byte(rr.Header.Len >> 16)
+		b[2] = byte(rr.Header.Len >> 8)
+		b[3] = byte(rr.Header.Len)
+		b[4] = byte(rr.Header.Type >> 8)
+		b[5] = byte(rr.Header.Type)
+		b[6] = byte(rr.Header.Flags >> 8)
+		b[7] = byte(rr.Header.Flags)
+		b[8] = byte(rr.Header.Seq >> 24)
+		b[9] = byte(rr.Header.Seq >> 16)
+		b[10] = byte(rr.Header.Seq >> 8)
+		b[11] = byte(rr.Header.Seq)
+		b[12] = byte(rr.Header.Pid >> 24)
+		b[13] = byte(rr.Header.Pid >> 16)
+		b[14] = byte(rr.Header.Pid >> 8)
+		b[15] = byte(rr.Header.Pid)
+		b[16] = byte(rr.Data.Family)
+	} else {
+		b[0] = byte(rr.Header.Len)
+		b[1] = byte(rr.Header.Len >> 8)
+		b[2] = byte(rr.Header.Len >> 16)
+		b[3] = byte(rr.Header.Len >> 24)
+		b[4] = byte(rr.Header.Type)
+		b[5] = byte(rr.Header.Type >> 8)
+		b[6] = byte(rr.Header.Flags)
+		b[7] = byte(rr.Header.Flags >> 8)
+		b[8] = byte(rr.Header.Seq)
+		b[9] = byte(rr.Header.Seq >> 8)
+		b[10] = byte(rr.Header.Seq >> 16)
+		b[11] = byte(rr.Header.Seq >> 24)
+		b[12] = byte(rr.Header.Pid)
+		b[13] = byte(rr.Header.Pid >> 8)
+		b[14] = byte(rr.Header.Pid >> 16)
+		b[15] = byte(rr.Header.Pid >> 24)
+		b[16] = byte(rr.Data.Family)
+	}
 	return b
 }
 
diff --git a/libgo/testsuite/Makefile.in b/libgo/testsuite/Makefile.in
index 4628fdd919b..56808efd168 100644
--- a/libgo/testsuite/Makefile.in
+++ b/libgo/testsuite/Makefile.in
@@ -86,6 +86,7 @@ GOARCH = @GOARCH@
 GOC = @GOC@
 GOCFLAGS = @GOCFLAGS@
 GOOS = @GOOS@
+GO_BIGENDIAN = @GO_BIGENDIAN@
 GO_LIBCALL_OS_ARCH_FILE = @GO_LIBCALL_OS_ARCH_FILE@
 GO_LIBCALL_OS_FILE = @GO_LIBCALL_OS_FILE@
 GO_SYSCALL_OS_ARCH_FILE = @GO_SYSCALL_OS_ARCH_FILE@