riscv: Add kprobes supported
This patch enables "kprobe & kretprobe" to work with ftrace interface. It utilized software breakpoint as single-step mechanism. Some instructions which can't be single-step executed must be simulated in kernel execution slot, such as: branch, jal, auipc, la ... Some instructions should be rejected for probing and we use a blacklist to filter, such as: ecall, ebreak, ... We use ebreak & c.ebreak to replace origin instruction and the kprobe handler prepares an executable memory slot for out-of-line execution with a copy of the original instruction being probed. In execution slot we add ebreak behind original instruction to simulate a single-setp mechanism. The patch is based on packi's work [1] and csky's work [2]. - The kprobes_trampoline.S is all from packi's patch - The single-step mechanism is new designed for riscv without hw single-step trap - The simulation codes are from csky - Frankly, all codes refer to other archs' implementation [1] https://lore.kernel.org/linux-riscv/20181113195804.22825-1-me@packi.ch/ [2] https://lore.kernel.org/linux-csky/20200403044150.20562-9-guoren@kernel.org/ Signed-off-by:Guo Ren <guoren@linux.alibaba.com> Co-developed-by:
Patrick Stählin <me@packi.ch> Signed-off-by:
Patrick Stählin <me@packi.ch> Acked-by:
Masami Hiramatsu <mhiramat@kernel.org> Tested-by:
Zong Li <zong.li@sifive.com> Reviewed-by:
Pekka Enberg <penberg@kernel.org> Cc: Patrick Stählin <me@packi.ch> Cc: Palmer Dabbelt <palmerdabbelt@google.com> Cc: Björn Töpel <bjorn.topel@gmail.com> Signed-off-by:
Palmer Dabbelt <palmerdabbelt@google.com>
parent
afc76b8b
-
mentioned in commit fd0f0659
-
mentioned in commit b2d473a6
-
mentioned in commit eb3e943a
-
mentioned in commit 1ce70a9e
-
mentioned in commit a33220fa
-
mentioned in commit ca025499
-
mentioned in commit 614471b7
-
mentioned in commit f4c8fc77
-
mentioned in commit 87f48c7c
-
mentioned in commit 04a73558
-
mentioned in commit eb742327
-
mentioned in commit 026cae99
-
mentioned in commit 14a2de5c
-
mentioned in commit 070b3ccb
-
mentioned in commit 97fb6013
-
mentioned in commit 5fb6a480
-
mentioned in commit b59f2129
Please register or sign in to comment