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55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
use core::ffi::c_void;
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#[cfg(any(
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bpf_target_arch = "x86_64",
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bpf_target_arch = "arm",
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bpf_target_arch = "powerpc64",
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bpf_target_arch = "mips"
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))]
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use crate::bindings::pt_regs;
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// aarch64 uses user_pt_regs instead of pt_regs
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#[cfg(any(bpf_target_arch = "aarch64", bpf_target_arch = "s390x"))]
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use crate::bindings::user_pt_regs as pt_regs;
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// riscv64 uses user_regs_struct instead of pt_regs
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#[cfg(bpf_target_arch = "riscv64")]
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use crate::bindings::user_regs_struct as pt_regs;
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use crate::{args::FromPtRegs, EbpfContext};
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pub struct RetProbeContext {
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pub regs: *mut pt_regs,
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}
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impl RetProbeContext {
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pub fn new(ctx: *mut c_void) -> RetProbeContext {
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RetProbeContext {
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regs: ctx as *mut pt_regs,
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}
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}
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/// Returns the return value of the probed function.
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///
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/// # Examples
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///
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/// ```no_run
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/// # #![allow(dead_code)]
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/// # use core::ffi::c_int;
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/// # use aya_ebpf::{programs::RetProbeContext};
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/// unsafe fn try_kretprobe_try_to_wake_up(ctx: RetProbeContext) -> Result<u32, u32> {
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/// let retval: c_int = ctx.ret().ok_or(1u32)?;
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///
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/// // Do something with retval
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///
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/// Ok(0)
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/// }
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/// ```
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pub fn ret<T: FromPtRegs>(&self) -> Option<T> {
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T::from_retval(unsafe { &*self.regs })
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}
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}
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impl EbpfContext for RetProbeContext {
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fn as_ptr(&self) -> *mut c_void {
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self.regs as *mut c_void
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}
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}
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