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| author |  Song Shuai <suagrfillet@gmail.com>
| 2023-11-30 13:15:30 +0100 |
|---|---|---|
| committer |  Palmer Dabbelt <palmer@rivosinc.com>
| 2024-01-17 18:17:09 -0800 |
| commit | 196c79f19a92764d45005599f35338cf0a9eafbb (patch) | |
| tree | d29441488a5f8f2db428abf1cb5deb6752d367ad /samples | |
| parent | riscv: ftrace: Make function graph use ftrace directly (diff) | |
| download | linux-196c79f19a92764d45005599f35338cf0a9eafbb.tar.gz linux-196c79f19a92764d45005599f35338cf0a9eafbb.tar.bz2 linux-196c79f19a92764d45005599f35338cf0a9eafbb.zip | |
riscv: ftrace: Add DYNAMIC_FTRACE_WITH_DIRECT_CALLS support
Select the DYNAMIC_FTRACE_WITH_DIRECT_CALLS to provide the
register_ftrace_direct[_multi] interfaces allowing users to register
the customed trampoline (direct_caller) as the mcount for one or more
target functions. And modify_ftrace_direct[_multi] are also provided
for modifying direct_caller.
To make the direct_caller and the other ftrace hooks (e.g.
function/fgraph tracer, k[ret]probes) co-exist, a temporary register
is nominated to store the address of direct_caller in
ftrace_regs_caller. After the setting of the address direct_caller by
direct_ops->func and the RESTORE_REGS in ftrace_regs_caller,
direct_caller will be jumped to by the `jr` inst.
Add DYNAMIC_FTRACE_WITH_DIRECT_CALLS support for RISC-V.
Signed-off-by: Song Shuai <suagrfillet@gmail.com>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
Acked-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20231130121531.1178502-4-bjorn@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions