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| author | Donglin Peng <pengdonglin@sangfor.com.cn> | 2023-04-08 05:42:19 -0700 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-06-22 10:39:56 -0400 |
| commit | b97aec082b51a0728adc9f69494826d32e0d1f8f (patch) | |
| tree | 9c6f0e1c384e0ed29ae6b76aba825cdde0aa18e6 /arch/riscv/kernel/mcount.S | |
| parent | 38638ffa6059049334b4d87bd4d85cf3418b5e27 (diff) | |
| download | linux-stable-b97aec082b51a0728adc9f69494826d32e0d1f8f.tar.gz linux-stable-b97aec082b51a0728adc9f69494826d32e0d1f8f.tar.bz2 linux-stable-b97aec082b51a0728adc9f69494826d32e0d1f8f.zip | |
riscv: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
The previous patch ("function_graph: Support recording and printing
the return value of function") has laid the groundwork for the for
the funcgraph-retval, and this modification makes it available on
the RISC-V platform.
We introduce a new structure called fgraph_ret_regs for the RISC-V
platform to hold return registers and the frame pointer. We then
fill its content in the return_to_handler and pass its address to
the function ftrace_return_to_handler to record the return value.
Link: https://lore.kernel.org/linux-trace-kernel/a8d71b12259f90e7e63d0ea654fcac95b0232bbc.1680954589.git.pengdonglin@sangfor.com.cn
Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'arch/riscv/kernel/mcount.S')
| -rw-r--r-- | arch/riscv/kernel/mcount.S | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S index 30102aadc4d7..8a6e5a9e842a 100644 --- a/arch/riscv/kernel/mcount.S +++ b/arch/riscv/kernel/mcount.S @@ -65,13 +65,8 @@ ENTRY(return_to_handler) * So alternatively we check the *old* frame pointer position, that is, the * value stored in -16(s0) on entry, and the s0 on return. */ -#ifdef HAVE_FUNCTION_GRAPH_FP_TEST - mv t6, s0 -#endif SAVE_RET_ABI_STATE -#ifdef HAVE_FUNCTION_GRAPH_FP_TEST - mv a0, t6 -#endif + mv a0, sp call ftrace_return_to_handler mv a2, a0 RESTORE_RET_ABI_STATE |