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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2025 Google, Inc.
*/
#ifndef _LINUX_RUST_BINDER_H
#define _LINUX_RUST_BINDER_H
#include <uapi/linux/android/binder.h>
#include <uapi/linux/android/binderfs.h>
/*
* These symbols are exposed by `rust_binderfs.c` and exist here so that Rust
* Binder can call them.
*/
int init_rust_binderfs(void);
struct dentry;
struct inode;
struct dentry *rust_binderfs_create_proc_file(struct inode *nodp, int pid);
void rust_binderfs_remove_file(struct dentry *dentry);
/*
* The internal data types in the Rust Binder driver are opaque to C, so we use
* void pointer typedefs for these types.
*/
typedef void *rust_binder_transaction;
typedef void *rust_binder_process;
typedef void *rust_binder_node;
struct rb_process_layout {
size_t arc_offset;
size_t task;
};
struct rb_transaction_layout {
size_t debug_id;
size_t code;
size_t flags;
size_t from_thread;
size_t to_proc;
size_t target_node;
};
struct rb_node_layout {
size_t arc_offset;
size_t debug_id;
size_t ptr;
};
struct rust_binder_layout {
struct rb_transaction_layout t;
struct rb_process_layout p;
struct rb_node_layout n;
};
extern const struct rust_binder_layout RUST_BINDER_LAYOUT;
static inline size_t rust_binder_transaction_debug_id(rust_binder_transaction t)
{
return *(size_t *) (t + RUST_BINDER_LAYOUT.t.debug_id);
}
static inline u32 rust_binder_transaction_code(rust_binder_transaction t)
{
return *(u32 *) (t + RUST_BINDER_LAYOUT.t.code);
}
static inline u32 rust_binder_transaction_flags(rust_binder_transaction t)
{
return *(u32 *) (t + RUST_BINDER_LAYOUT.t.flags);
}
// Nullable!
static inline rust_binder_node rust_binder_transaction_target_node(rust_binder_transaction t)
{
void *p = *(void **) (t + RUST_BINDER_LAYOUT.t.target_node);
if (p)
p = p + RUST_BINDER_LAYOUT.n.arc_offset;
return p;
}
static inline rust_binder_process rust_binder_transaction_to_proc(rust_binder_transaction t)
{
void *p = *(void **) (t + RUST_BINDER_LAYOUT.t.to_proc);
return p + RUST_BINDER_LAYOUT.p.arc_offset;
}
static inline struct task_struct *rust_binder_process_task(rust_binder_process t)
{
return *(struct task_struct **) (t + RUST_BINDER_LAYOUT.p.task);
}
static inline size_t rust_binder_node_debug_id(rust_binder_node t)
{
return *(size_t *) (t + RUST_BINDER_LAYOUT.n.debug_id);
}
#endif
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