linux/arch/riscv/kernel/probes/rethook.c
Binglei Wang b57c2f1240
riscv: add riscv rethook implementation
Implement the kretprobes on riscv arch by using rethook machenism
which abstracts general kretprobe info into a struct rethook_node
to be embedded in the struct kretprobe_instance.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Binglei Wang <l3b2w1@gmail.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221025151831.1097417-1-conor@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-12-02 13:04:05 -08:00

28 lines
674 B
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic return hook for riscv.
*/
#include <linux/kprobes.h>
#include <linux/rethook.h>
#include "rethook.h"
/* This is called from arch_rethook_trampoline() */
unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
{
return rethook_trampoline_handler(regs, regs->s0);
}
NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
{
rhn->ret_addr = regs->ra;
rhn->frame = regs->s0;
/* replace return addr with trampoline */
regs->ra = (unsigned long)arch_rethook_trampoline;
}
NOKPROBE_SYMBOL(arch_rethook_prepare);