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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2025 Google LLC.
use core::mem::MaybeUninit;
use core::ops::{Deref, DerefMut};
use kernel::{
transmute::{AsBytes, FromBytes},
uapi::{self, *},
};
macro_rules! pub_no_prefix {
($prefix:ident, $($newname:ident),+ $(,)?) => {
$(pub(crate) const $newname: u32 = kernel::macros::concat_idents!($prefix, $newname);)+
};
}
pub_no_prefix!(
binder_driver_return_protocol_,
BR_TRANSACTION,
BR_TRANSACTION_SEC_CTX,
BR_REPLY,
BR_DEAD_REPLY,
BR_FAILED_REPLY,
BR_FROZEN_REPLY,
BR_NOOP,
BR_SPAWN_LOOPER,
BR_TRANSACTION_COMPLETE,
BR_TRANSACTION_PENDING_FROZEN,
BR_ONEWAY_SPAM_SUSPECT,
BR_OK,
BR_ERROR,
BR_INCREFS,
BR_ACQUIRE,
BR_RELEASE,
BR_DECREFS,
BR_DEAD_BINDER,
BR_CLEAR_DEATH_NOTIFICATION_DONE,
BR_FROZEN_BINDER,
BR_CLEAR_FREEZE_NOTIFICATION_DONE,
);
pub_no_prefix!(
binder_driver_command_protocol_,
BC_TRANSACTION,
BC_TRANSACTION_SG,
BC_REPLY,
BC_REPLY_SG,
BC_FREE_BUFFER,
BC_ENTER_LOOPER,
BC_EXIT_LOOPER,
BC_REGISTER_LOOPER,
BC_INCREFS,
BC_ACQUIRE,
BC_RELEASE,
BC_DECREFS,
BC_INCREFS_DONE,
BC_ACQUIRE_DONE,
BC_REQUEST_DEATH_NOTIFICATION,
BC_CLEAR_DEATH_NOTIFICATION,
BC_DEAD_BINDER_DONE,
BC_REQUEST_FREEZE_NOTIFICATION,
BC_CLEAR_FREEZE_NOTIFICATION,
BC_FREEZE_NOTIFICATION_DONE,
);
pub_no_prefix!(
flat_binder_object_flags_,
FLAT_BINDER_FLAG_ACCEPTS_FDS,
FLAT_BINDER_FLAG_TXN_SECURITY_CTX
);
pub_no_prefix!(
transaction_flags_,
TF_ONE_WAY,
TF_ACCEPT_FDS,
TF_CLEAR_BUF,
TF_UPDATE_TXN
);
pub(crate) use uapi::{
BINDER_TYPE_BINDER, BINDER_TYPE_FD, BINDER_TYPE_FDA, BINDER_TYPE_HANDLE, BINDER_TYPE_PTR,
BINDER_TYPE_WEAK_BINDER, BINDER_TYPE_WEAK_HANDLE,
};
macro_rules! decl_wrapper {
($newname:ident, $wrapped:ty) => {
// Define a wrapper around the C type. Use `MaybeUninit` to enforce that the value of
// padding bytes must be preserved.
#[derive(Copy, Clone)]
#[repr(transparent)]
pub(crate) struct $newname(MaybeUninit<$wrapped>);
// SAFETY: This macro is only used with types where this is ok.
unsafe impl FromBytes for $newname {}
// SAFETY: This macro is only used with types where this is ok.
unsafe impl AsBytes for $newname {}
impl Deref for $newname {
type Target = $wrapped;
fn deref(&self) -> &Self::Target {
// SAFETY: We use `MaybeUninit` only to preserve padding. The value must still
// always be valid.
unsafe { self.0.assume_init_ref() }
}
}
impl DerefMut for $newname {
fn deref_mut(&mut self) -> &mut Self::Target {
// SAFETY: We use `MaybeUninit` only to preserve padding. The value must still
// always be valid.
unsafe { self.0.assume_init_mut() }
}
}
impl Default for $newname {
fn default() -> Self {
// Create a new value of this type where all bytes (including padding) are zeroed.
Self(MaybeUninit::zeroed())
}
}
};
}
decl_wrapper!(BinderNodeDebugInfo, uapi::binder_node_debug_info);
decl_wrapper!(BinderNodeInfoForRef, uapi::binder_node_info_for_ref);
decl_wrapper!(FlatBinderObject, uapi::flat_binder_object);
decl_wrapper!(BinderFdObject, uapi::binder_fd_object);
decl_wrapper!(BinderFdArrayObject, uapi::binder_fd_array_object);
decl_wrapper!(BinderObjectHeader, uapi::binder_object_header);
decl_wrapper!(BinderBufferObject, uapi::binder_buffer_object);
decl_wrapper!(BinderTransactionData, uapi::binder_transaction_data);
decl_wrapper!(
BinderTransactionDataSecctx,
uapi::binder_transaction_data_secctx
);
decl_wrapper!(BinderTransactionDataSg, uapi::binder_transaction_data_sg);
decl_wrapper!(BinderWriteRead, uapi::binder_write_read);
decl_wrapper!(BinderVersion, uapi::binder_version);
decl_wrapper!(BinderFrozenStatusInfo, uapi::binder_frozen_status_info);
decl_wrapper!(BinderFreezeInfo, uapi::binder_freeze_info);
decl_wrapper!(BinderFrozenStateInfo, uapi::binder_frozen_state_info);
decl_wrapper!(BinderHandleCookie, uapi::binder_handle_cookie);
decl_wrapper!(ExtendedError, uapi::binder_extended_error);
impl BinderVersion {
pub(crate) fn current() -> Self {
Self(MaybeUninit::new(uapi::binder_version {
protocol_version: BINDER_CURRENT_PROTOCOL_VERSION as _,
}))
}
}
impl BinderTransactionData {
pub(crate) fn with_buffers_size(self, buffers_size: u64) -> BinderTransactionDataSg {
BinderTransactionDataSg(MaybeUninit::new(uapi::binder_transaction_data_sg {
transaction_data: *self,
buffers_size,
}))
}
}
impl BinderTransactionDataSecctx {
/// View the inner data as wrapped in `BinderTransactionData`.
pub(crate) fn tr_data(&mut self) -> &mut BinderTransactionData {
// SAFETY: Transparent wrapper is safe to transmute.
unsafe {
&mut *(&mut self.transaction_data as *mut uapi::binder_transaction_data
as *mut BinderTransactionData)
}
}
}
impl ExtendedError {
pub(crate) fn new(id: u32, command: u32, param: i32) -> Self {
Self(MaybeUninit::new(uapi::binder_extended_error {
id,
command,
param,
}))
}
}
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