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8f3481028b
Add Rust Binder `command` and `return` tracepoint declarations and wire them in where BC commands are parsed and BR return codes are emitted to userspace. Signed-off-by: Mohamad Alsadhan <mo@sdhn.cc> Link: https://patch.msgid.link/20260317-rust-binder-trace-v3-6-6fae4fbcf637@sdhn.cc Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
106 lines
3.4 KiB
Rust
106 lines
3.4 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2025 Google LLC.
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use crate::transaction::Transaction;
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use kernel::bindings::{rust_binder_transaction, task_struct};
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use kernel::error::Result;
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use kernel::ffi::{c_int, c_uint, c_ulong};
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use kernel::task::Task;
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use kernel::tracepoint::declare_trace;
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declare_trace! {
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unsafe fn binder_ioctl(cmd: c_uint, arg: c_ulong);
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unsafe fn binder_ioctl_done(ret: c_int);
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unsafe fn binder_read_done(ret: c_int);
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unsafe fn binder_write_done(ret: c_int);
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unsafe fn binder_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool);
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unsafe fn binder_transaction(reply: bool, t: rust_binder_transaction, thread: *mut task_struct);
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unsafe fn binder_transaction_received(t: rust_binder_transaction);
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unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);
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unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);
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unsafe fn binder_command(cmd: u32);
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unsafe fn binder_return(ret: u32);
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}
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#[inline]
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fn raw_transaction(t: &Transaction) -> rust_binder_transaction {
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t as *const Transaction as rust_binder_transaction
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}
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#[inline]
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fn to_errno(ret: Result) -> i32 {
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match ret {
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Ok(()) => 0,
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Err(err) => err.to_errno(),
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}
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}
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#[inline]
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pub(crate) fn trace_ioctl(cmd: u32, arg: usize) {
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// SAFETY: Always safe to call.
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unsafe { binder_ioctl(cmd, arg as c_ulong) }
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}
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#[inline]
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pub(crate) fn trace_ioctl_done(ret: Result) {
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// SAFETY: Always safe to call.
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unsafe { binder_ioctl_done(to_errno(ret)) }
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}
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#[inline]
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pub(crate) fn trace_read_done(ret: Result) {
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// SAFETY: Always safe to call.
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unsafe { binder_read_done(to_errno(ret)) }
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}
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#[inline]
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pub(crate) fn trace_write_done(ret: Result) {
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// SAFETY: Always safe to call.
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unsafe { binder_write_done(to_errno(ret)) }
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}
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#[inline]
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pub(crate) fn trace_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool) {
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// SAFETY: Always safe to call.
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unsafe { binder_wait_for_work(proc_work, transaction_stack, thread_todo) }
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}
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#[inline]
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pub(crate) fn trace_transaction(reply: bool, t: &Transaction, thread: Option<&Task>) {
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let thread = match thread {
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Some(thread) => thread.as_ptr(),
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None => core::ptr::null_mut(),
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};
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// SAFETY: The raw transaction is valid for the duration of this call. The thread pointer is
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// valid or null.
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unsafe { binder_transaction(reply, raw_transaction(t), thread) }
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}
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#[inline]
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pub(crate) fn trace_transaction_received(t: &Transaction) {
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// SAFETY: The raw transaction is valid for the duration of this call.
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unsafe { binder_transaction_received(raw_transaction(t)) }
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}
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#[inline]
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pub(crate) fn trace_transaction_fd_send(t_debug_id: usize, fd: u32, offset: usize) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_transaction_fd_send(t_debug_id as c_int, fd as c_int, offset) }
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}
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#[inline]
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pub(crate) fn trace_transaction_fd_recv(t_debug_id: usize, fd: u32, offset: usize) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_transaction_fd_recv(t_debug_id as c_int, fd as c_int, offset) }
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}
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#[inline]
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pub(crate) fn trace_command(cmd: u32) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_command(cmd) }
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}
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#[inline]
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pub(crate) fn trace_return(ret: u32) {
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// SAFETY: This function is always safe to call.
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unsafe { binder_return(ret) }
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}
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