sys/linux: switch ppc64le to little-endian

make extract recently broke for powerpc on linux-next with:

include/uapi/linux/byteorder/big_endian.h:6:2: error: #error "Unsupported endianness, check your toolchain"
 #error "Unsupported endianness, check your toolchain"

Turns out we always built ppc64le headers as big-endian.
First, kernel was configured as BE.
Then, we used gcc to build an executable program for host
and on x86 gcc does not define __LITTLE_ENDIAN__ so kernel
thought that the toolchain is BE too.

Configure kernel as LE and define __LITTLE_ENDIAN__.

This actually changes values of some consts,
but fortunately just few of them.

6 files changed, 29 insertions, 24 deletions

diff --git a/sys/linux/gen/ppc64le.go b/sys/linux/gen/ppc64le.go
index 440ffb107..cdda9f68d 100644
--- a/sys/linux/gen/ppc64le.go
+++ b/sys/linux/gen/ppc64le.go
@@ -6368,8 +6368,8 @@ var structDescs_ppc64le = []*KeyedStruct{
 		&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int8", FldName: "control", TypeSize: 1}, BitfieldOff: 5, BitfieldLen: 1, BitfieldMdl: true}},
 		&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int8", FldName: "version", TypeSize: 1}, BitfieldOff: 6, BitfieldLen: 2}},
 		&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int8", FldName: "proto_ctype", TypeSize: 1}}},
-		&FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "guehdr_flags", FldName: "flags", TypeSize: 2}}, Vals: []uint64{1}, BitMask: true},
-		&ArrayType{TypeCommon: TypeCommon{TypeName: "array", FldName: "priv", IsVarlen: true}, Type: &FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "guehdr_prov_flags", TypeSize: 4}}, Vals: []uint64{2147483648}, BitMask: true}, Kind: 1, RangeEnd: 1},
+		&FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "guehdr_flags", FldName: "flags", TypeSize: 2}}, Vals: []uint64{256}, BitMask: true},
+		&ArrayType{TypeCommon: TypeCommon{TypeName: "array", FldName: "priv", IsVarlen: true}, Type: &FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "guehdr_prov_flags", TypeSize: 4}}, Vals: []uint64{128}, BitMask: true}, Kind: 1, RangeEnd: 1},
 	}}},
 	{Key: StructKey{Name: "hashlimit_cfg1"}, Desc: &StructDesc{TypeCommon: TypeCommon{TypeName: "hashlimit_cfg1", TypeSize: 32}, Fields: []Type{
 		&FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "xt_hashlimit_modes", FldName: "mode", TypeSize: 4}}, Vals: []uint64{1, 2, 4, 8, 16, 32, 64}, BitMask: true},
@@ -41295,7 +41295,7 @@ var syscalls_ppc64le = []*Syscall{
 	{NR: 326, Name: "socket$packet", CallName: "socket", Args: []Type{
 		&ConstType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "const", FldName: "domain", TypeSize: 8}}, Val: 17},
 		&FlagsType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "packet_socket_type", FldName: "type", TypeSize: 8}}, Vals: []uint64{3, 2}},
-		&ConstType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "const", FldName: "proto", TypeSize: 8}}, Val: 3},
+		&ConstType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "const", FldName: "proto", TypeSize: 8}}, Val: 768},
 	}, Ret: &ResourceType{TypeCommon: TypeCommon{TypeName: "sock_packet", FldName: "ret", TypeSize: 4, ArgDir: 1}}},
 	{NR: 326, Name: "socket$pppoe", CallName: "socket", Args: []Type{
 		&ConstType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "const", FldName: "domain", TypeSize: 8}}, Val: 24},
@@ -43987,7 +43987,7 @@ var consts_ppc64le = []ConstValue{
 	{Name: "ETH_P_AARP", Value: 33011},
 	{Name: "ETH_P_AF_IUCV", Value: 64507},
 	{Name: "ETH_P_ALL", Value: 3},
-	{Name: "ETH_P_ALL_BE", Value: 3},
+	{Name: "ETH_P_ALL_BE", Value: 768},
 	{Name: "ETH_P_AOE", Value: 34978},
 	{Name: "ETH_P_ARCNET", Value: 26},
 	{Name: "ETH_P_ARP", Value: 2054},
@@ -44473,8 +44473,8 @@ var consts_ppc64le = []ConstValue{
 	{Name: "GIO_UNISCRNMAP", Value: 19305},
 	{Name: "GRND_NONBLOCK", Value: 1},
 	{Name: "GRND_RANDOM", Value: 2},
-	{Name: "GUE_FLAG_PRIV", Value: 1},
-	{Name: "GUE_PFLAG_REMCSUM", Value: 2147483648},
+	{Name: "GUE_FLAG_PRIV", Value: 256},
+	{Name: "GUE_PFLAG_REMCSUM", Value: 128},
 	{Name: "HASH_ALGO__LAST", Value: 20},
 	{Name: "HCIBLOCKADDR", Value: 2147764454},
 	{Name: "HCIDEVDOWN", Value: 2147764426},
@@ -50590,4 +50590,4 @@ var consts_ppc64le = []ConstValue{
 	{Name: "bpf_insn_load_imm_dw", Value: 24},
 }
 
-const revision_ppc64le = "84345e4c9ab2df204d5e2216e1ee380880b1e68c"
+const revision_ppc64le = "dd812ad5534b0a3035b3aecdae9fb6d47a6e2ffa"
diff --git a/sys/linux/socket_packet_ppc64le.const b/sys/linux/socket_packet_ppc64le.const
index 79f28f517..2de392a9e 100644
--- a/sys/linux/socket_packet_ppc64le.const
+++ b/sys/linux/socket_packet_ppc64le.const
@@ -4,7 +4,7 @@ ARPHRD_ETHER = 1
 ETH_P_802_2 = 4
 ETH_P_802_3 = 1
 ETH_P_ALL = 3
-ETH_P_ALL_BE = 3
+ETH_P_ALL_BE = 768
 ETH_P_ARCNET = 26
 ETH_P_AX25 = 2
 ETH_P_CAIF = 247
diff --git a/sys/linux/vnet_ppc64le.const b/sys/linux/vnet_ppc64le.const
index d51f5c41d..b8e3d7fc5 100644
--- a/sys/linux/vnet_ppc64le.const
+++ b/sys/linux/vnet_ppc64le.const
@@ -174,8 +174,8 @@ ETH_P_WAN_PPP = 7
 ETH_P_WCCP = 34878
 ETH_P_X25 = 2053
 ETH_P_XDSA = 248
-GUE_FLAG_PRIV = 1
-GUE_PFLAG_REMCSUM = 2147483648
+GUE_FLAG_PRIV = 256
+GUE_PFLAG_REMCSUM = 128
 ICMPV6_ADDR_UNREACH = 3
 ICMPV6_ADM_PROHIBITED = 1
 ICMPV6_DEST_UNREACH = 1
diff --git a/sys/syz-extract/fetch.go b/sys/syz-extract/fetch.go
index a3c49c9b5..bb0c8b54b 100644
--- a/sys/syz-extract/fetch.go
+++ b/sys/syz-extract/fetch.go
@@ -58,7 +58,8 @@ func extract(info *compiler.ConstInfo, cc string, args []string, addSource strin
 		}
 		bin, out, err = compile(cc, args, data)
 		if err != nil {
-			return nil, nil, fmt.Errorf("failed to run compiler: %v\n%v", err, string(out))
+			return nil, nil, fmt.Errorf("failed to run compiler: %v %v\n%v\n%v",
+				cc, args, err, string(out))
 		}
 	}
 	defer os.Remove(bin)
diff --git a/sys/syz-extract/linux.go b/sys/syz-extract/linux.go
index 45f8144ce..3ca100b73 100644
--- a/sys/syz-extract/linux.go
+++ b/sys/syz-extract/linux.go
@@ -82,17 +82,17 @@ func (*linux) prepareArch(arch *Arch) error {
 	if err != nil {
 		return fmt.Errorf("make defconfig failed: %v\n%s", err, out)
 	}
-	// Without CONFIG_NETFILTER kernel does not build.
-	_, err = osutil.RunCmd(time.Minute, buildDir, "sed", "-i",
-		"s@# CONFIG_NETFILTER is not set@CONFIG_NETFILTER=y@g", ".config")
+	_, err = osutil.RunCmd(time.Minute, buildDir, filepath.Join(kernelDir, "scripts", "config"),
+		// powerpc arch is configured to be big-endian by default, but we want little-endian powerpc.
+		// Since all of our archs are little-endian for now, we just blindly switch it.
+		"-d", "CPU_BIG_ENDIAN", "-e", "CPU_LITTLE_ENDIAN",
+		// Without CONFIG_NETFILTER kernel does not build.
+		"-e", "NETFILTER",
+		// include/net/mptcp.h is the only header in kernel that guards some
+		// of the consts with own config, so we need to enable CONFIG_MPTCP.
+		"-e", "MPTCP")
 	if err != nil {
-		return fmt.Errorf("sed .config failed: %v", err)
-	}
-	// include/net/mptcp.h is the only header in kernel that guards some of the consts with own config
-	_, err = osutil.RunCmd(time.Minute, buildDir, "sed", "-i",
-		"s@# CONFIG_MPTCP is not set@CONFIG_MPTCP=y@g", ".config")
-	if err != nil {
-		return fmt.Errorf("sed .config failed: %v", err)
+		return err
 	}
 	out, err = osutil.RunCmd(time.Hour, kernelDir, "make", append(makeArgs, "olddefconfig")...)
 	if err != nil {
diff --git a/sys/targets/targets.go b/sys/targets/targets.go
index da8c568fe..d9095e1c2 100644
--- a/sys/targets/targets.go
+++ b/sys/targets/targets.go
@@ -161,9 +161,13 @@ var List = map[string]map[string]*Target{
 			KernelHeaderArch: "arm",
 		},
 		"ppc64le": {
-			PtrSize:          8,
-			PageSize:         4 << 10,
-			CFlags:           []string{"-D__powerpc64__"},
+			PtrSize:  8,
+			PageSize: 4 << 10,
+			CFlags: []string{
+				"-D__powerpc64__",
+				"-D__LITTLE_ENDIAN__=1",
+				"-D__BYTE_ORDER__=__ORDER_LITTLE_ENDIAN__",
+			},
 			CrossCFlags:      []string{"-D__powerpc64__", "-static"},
 			CCompilerPrefix:  "powerpc64le-linux-gnu-",
 			KernelArch:       "powerpc",