Makefile: generate descriptions on-the-fly

Checking in the generated descriptions files makes few things simpler,
but causes pain for pull requests: (1) PRs that touch descriptions
_always_ conflict, (2) PRs are large and harder to review,
(3) people sometimes forget to add auto-generated files.

The proposed way does not require us to hardcode lots of dependencies
in the Makefile (which is nice) and seem to work.
Let's see how it works.

The main contributor-visible consequence is that the auto-generated
files do not need to be checked-in now.

Credit for figuring the Makefile magic goes to @melver.

Fixes #1291

2 files changed, 0 insertions, 229 deletions

diff --git a/sys/trusty/gen/arm.go b/sys/trusty/gen/arm.go
deleted file mode 100644
index b504e7c38..000000000
--- a/sys/trusty/gen/arm.go
+++ /dev/null
@@ -1,226 +0,0 @@
-// AUTOGENERATED FILE
-// +build !codeanalysis
-// +build !syz_target syz_target,syz_os_trusty,syz_arch_arm
-
-package gen
-
-import . "github.com/google/syzkaller/prog"
-import . "github.com/google/syzkaller/sys/trusty"
-
-func init() {
-	RegisterTarget(&Target{OS: "trusty", Arch: "arm", Revision: revision_arm, PtrSize: 4, PageSize: 4096, NumPages: 4096, DataOffset: 536870912, Syscalls: syscalls_arm, Resources: resources_arm, Structs: structDescs_arm, Types: types_arm, Consts: consts_arm}, InitTarget)
-}
-
-var resources_arm = []*ResourceDesc(nil)
-
-var structDescs_arm = []*KeyedStruct{
-	{StructKey{Name: "dma_pmem"}, &StructDesc{TypeCommon: TypeCommon{TypeName: "dma_pmem", TypeSize: 4}, Fields: []Type{
-		Ref(18),
-	}}},
-	{StructKey{Name: "ipc_msg"}, &StructDesc{TypeCommon: TypeCommon{TypeName: "ipc_msg", TypeSize: 4}, Fields: []Type{
-		Ref(18),
-	}}},
-	{StructKey{"ipc_msg", 1}, &StructDesc{TypeCommon: TypeCommon{TypeName: "ipc_msg", TypeSize: 4, ArgDir: 1}, Fields: []Type{
-		Ref(17),
-	}}},
-	{StructKey{Name: "ipc_msg_info"}, &StructDesc{TypeCommon: TypeCommon{TypeName: "ipc_msg_info", TypeSize: 4}, Fields: []Type{
-		Ref(18),
-	}}},
-	{StructKey{Name: "uevent"}, &StructDesc{TypeCommon: TypeCommon{TypeName: "uevent", TypeSize: 4}, Fields: []Type{
-		Ref(18),
-	}}},
-	{StructKey{"uevent", 1}, &StructDesc{TypeCommon: TypeCommon{TypeName: "uevent", TypeSize: 4, ArgDir: 1}, Fields: []Type{
-		Ref(17),
-	}}},
-	{StructKey{"uuid", 1}, &StructDesc{TypeCommon: TypeCommon{TypeName: "uuid", TypeSize: 4, ArgDir: 1}, Fields: []Type{
-		Ref(17),
-	}}},
-}
-
-var syscalls_arm = []*Syscall{
-	{NR: 18, Name: "accept", CallName: "accept", Args: []Type{
-		Ref(9),
-		Ref(34),
-	}},
-	{NR: 2, Name: "brk", CallName: "brk", Args: []Type{
-		Ref(3),
-	}},
-	{NR: 19, Name: "close", CallName: "close", Args: []Type{
-		Ref(9),
-	}},
-	{NR: 17, Name: "connect", CallName: "connect", Args: []Type{
-		Ref(33),
-		Ref(7),
-	}},
-	{NR: 3, Name: "exit_etc", CallName: "exit_etc", Args: []Type{
-		Ref(15),
-		Ref(7),
-	}},
-	{NR: 11, Name: "finish_dma", CallName: "finish_dma", Args: []Type{
-		Ref(37),
-		Ref(23),
-		Ref(7),
-	}},
-	{NR: 32, Name: "get_msg", CallName: "get_msg", Args: []Type{
-		Ref(8),
-		Ref(32),
-	}},
-	{NR: 7, Name: "gettime", CallName: "gettime", Args: []Type{
-		Ref(4),
-		Ref(7),
-		Ref(36),
-	}},
-	{NR: 21, Name: "handle_set_create", CallName: "handle_set_create"},
-	{NR: 22, Name: "handle_set_ctrl", CallName: "handle_set_ctrl", Args: []Type{
-		Ref(8),
-		Ref(5),
-		Ref(27),
-	}},
-	{NR: 5, Name: "ioctl", CallName: "ioctl", Args: []Type{
-		Ref(6),
-		Ref(14),
-		Ref(24),
-	}},
-	{NR: 8, Name: "mmap", CallName: "mmap", Args: []Type{
-		Ref(45),
-		Ref(23),
-		Ref(7),
-		Ref(8),
-	}},
-	{NR: 9, Name: "munmap", CallName: "munmap", Args: []Type{
-		Ref(45),
-		Ref(23),
-	}},
-	{NR: 6, Name: "nanosleep", CallName: "nanosleep", Args: []Type{
-		Ref(4),
-		Ref(7),
-		Ref(19),
-	}},
-	{NR: 16, Name: "port_create", CallName: "port_create", Args: []Type{
-		Ref(33),
-		Ref(11),
-		Ref(13),
-		Ref(7),
-	}},
-	{NR: 10, Name: "prepare_dma", CallName: "prepare_dma", Args: []Type{
-		Ref(37),
-		Ref(23),
-		Ref(7),
-		Ref(35),
-	}},
-	{NR: 34, Name: "put_msg", CallName: "put_msg", Args: []Type{
-		Ref(8),
-		Ref(10),
-	}},
-	{NR: 4, Name: "read", CallName: "read", Args: []Type{
-		Ref(6),
-		Ref(28),
-		Ref(22),
-	}},
-	{NR: 33, Name: "read_msg", CallName: "read_msg", Args: []Type{
-		Ref(8),
-		Ref(10),
-		Ref(12),
-		Ref(30),
-	}},
-	{NR: 35, Name: "send_msg", CallName: "send_msg", Args: []Type{
-		Ref(8),
-		Ref(31),
-	}},
-	{NR: 20, Name: "set_cookie", CallName: "set_cookie", Args: []Type{
-		Ref(8),
-		Ref(21),
-	}},
-	{NR: 24, Name: "wait", CallName: "wait", Args: []Type{
-		Ref(9),
-		Ref(26),
-		Ref(16),
-	}},
-	{NR: 25, Name: "wait_any", CallName: "wait_any", Args: []Type{
-		Ref(25),
-		Ref(16),
-	}},
-	{NR: 1, Name: "write", CallName: "write", Args: []Type{
-		Ref(6),
-		Ref(29),
-		Ref(22),
-	}},
-}
-
-var types_arm = []Type{
-	&BufferType{TypeCommon: TypeCommon{TypeName: "array", ArgDir: 1, IsVarlen: true}},
-	&BufferType{TypeCommon: TypeCommon{TypeName: "array", IsVarlen: true}},
-	&BufferType{TypeCommon: TypeCommon{TypeName: "string", IsVarlen: true}, Kind: 2},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "brk", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "clock_id", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "cmd", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "fd", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "flags", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "handle", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "handle_id", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "msg_id", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "num_recv_bufs", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "offset", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "recv_buf_size", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "req", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "status", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "timeout_msecs", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "todo", TypeSize: 4, ArgDir: 1}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int32", FldName: "todo", TypeSize: 4}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int64", FldName: "sleep_time", TypeSize: 8}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "int64", TypeSize: 8, ArgDir: 1}}},
-	&IntType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "intptr", FldName: "cookie", TypeSize: 4}}},
-	&LenType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "len", FldName: "size", TypeSize: 4}}, Path: []string{"msg"}},
-	&LenType{IntTypeCommon: IntTypeCommon{TypeCommon: TypeCommon{TypeName: "len", FldName: "size", TypeSize: 4}}, Path: []string{"uaddr"}},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "buf", TypeSize: 4}, Ref(1)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "event", TypeSize: 4}, Ref(39)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "event", TypeSize: 4}, Ref(44)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "evt", TypeSize: 4}, Ref(44)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "msg", TypeSize: 4}, Ref(0)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "msg", TypeSize: 4}, Ref(1)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "msg", TypeSize: 4}, Ref(38)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "msg", TypeSize: 4}, Ref(42)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "msg_info", TypeSize: 4}, Ref(43)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "path", TypeSize: 4}, Ref(2)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "peer_uuid", TypeSize: 4}, Ref(40)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "pmem", TypeSize: 4}, Ref(41)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "time", TypeSize: 4}, Ref(20)},
-	&PtrType{TypeCommon{TypeName: "ptr", FldName: "uaddr", TypeSize: 4}, Ref(0)},
-	&StructType{Key: StructKey{"ipc_msg", 1}},
-	&StructType{Key: StructKey{"uevent", 1}},
-	&StructType{Key: StructKey{"uuid", 1}},
-	&StructType{Key: StructKey{Name: "dma_pmem"}},
-	&StructType{Key: StructKey{Name: "ipc_msg"}},
-	&StructType{Key: StructKey{Name: "ipc_msg_info"}},
-	&StructType{Key: StructKey{Name: "uevent"}},
-	&VmaType{TypeCommon: TypeCommon{TypeName: "vma", FldName: "uaddr", TypeSize: 4}},
-}
-
-var consts_arm = []ConstValue{
-	{"__NR_accept", 18},
-	{"__NR_brk", 2},
-	{"__NR_close", 19},
-	{"__NR_connect", 17},
-	{"__NR_exit_etc", 3},
-	{"__NR_finish_dma", 11},
-	{"__NR_get_msg", 32},
-	{"__NR_gettime", 7},
-	{"__NR_handle_set_create", 21},
-	{"__NR_handle_set_ctrl", 22},
-	{"__NR_ioctl", 5},
-	{"__NR_mmap", 8},
-	{"__NR_munmap", 9},
-	{"__NR_nanosleep", 6},
-	{"__NR_port_create", 16},
-	{"__NR_prepare_dma", 10},
-	{"__NR_put_msg", 34},
-	{"__NR_read", 4},
-	{"__NR_read_msg", 33},
-	{"__NR_send_msg", 35},
-	{"__NR_set_cookie", 20},
-	{"__NR_wait", 24},
-	{"__NR_wait_any", 25},
-	{"__NR_write", 1},
-}
-
-const revision_arm = "4e125f165259175fe2cbca4e0b1482229347c4f8"
diff --git a/sys/trusty/gen/empty.go b/sys/trusty/gen/empty.go
deleted file mode 100644
index 5baff07bf..000000000
--- a/sys/trusty/gen/empty.go
+++ /dev/null
@@ -1,3 +0,0 @@
-// AUTOGENERATED FILE
-// This file is needed if OS is completely excluded by build tags.
-package gen