diff options
| author | Xiaofeng Yuan <xiaofengmian@163.com> | 2026-08-07 19:24:29 -0600 |
|---|---|---|
| committer | Paul Walmsley <pjw@kernel.org> | 2026-08-07 19:24:29 -0600 |
| commit | 540ad5ad05a5945575b154caedfcdc08ed75b810 (patch) | |
| tree | 0dc613c711b4ce5f78beafbfda3dd781a46c85c6 /scripts/stackusage | |
| parent | 6a48dea3449c220b1c607ecdad4d1cd18eac9b78 (diff) | |
| download | linux-540ad5ad05a5945575b154caedfcdc08ed75b810.tar.gz linux-540ad5ad05a5945575b154caedfcdc08ed75b810.zip | |
riscv: probes: simulate c.jal instruction
The c.jal instruction is currently marked REJECTED in kprobes
instruction decoding, but it should be SIMULATED like other
compressed jump instructions.
Add simulate_c_jal() which saves the return address to RA and
sets the program counter to the target offset, reusing
simulate_c_j for the common jump logic.
Although c.jal is RV32-only, the function compiles unconditionally.
On RV64, riscv_insn_is_c_jal() always returns 0, so the simulation
code is never invoked and the small overhead in kernel size is
acceptable.
Signed-off-by: Xiaofeng Yuan <xiaofengmian@163.com>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Tested-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20260701081033.49871-2-xiaofengmian@163.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions