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| author | Donglin Peng <pengdonglin@sangfor.com.cn> | 2023-04-08 15:42:21 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-06-21 01:38:38 +0300 |
| commit | 5779e3c0f5aed8a3239839ad55ad017e1278ecd7 (patch) | |
| tree | 5566d12519150556e347901819addc0b77cb92e4 /arch/loongarch/kernel/mcount_dyn.S | |
| parent | d938ba17683effd95b44400d30df16fe541f40fd (diff) | |
| download | linux-5779e3c0f5aed8a3239839ad55ad017e1278ecd7.tar.xz | |
LoongArch: 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 LoongArch platform.
We introduce a new structure called fgraph_ret_regs for the LoongArch
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://lkml.kernel.org/r/c5462255e435fab363895c2d7433bc0f5a140411.1680954589.git.pengdonglin@sangfor.com.cn
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'arch/loongarch/kernel/mcount_dyn.S')
| -rw-r--r-- | arch/loongarch/kernel/mcount_dyn.S | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/arch/loongarch/kernel/mcount_dyn.S b/arch/loongarch/kernel/mcount_dyn.S index c7d961fc72c2..e16ab0b98e5a 100644 --- a/arch/loongarch/kernel/mcount_dyn.S +++ b/arch/loongarch/kernel/mcount_dyn.S @@ -136,18 +136,19 @@ SYM_CODE_END(ftrace_graph_caller) SYM_CODE_START(return_to_handler) /* Save return value regs */ - PTR_ADDI sp, sp, -2 * SZREG - PTR_S a0, sp, 0 - PTR_S a1, sp, SZREG + PTR_ADDI sp, sp, -FGRET_REGS_SIZE + PTR_S a0, sp, FGRET_REGS_A0 + PTR_S a1, sp, FGRET_REGS_A1 + PTR_S zero, sp, FGRET_REGS_FP - move a0, zero + move a0, sp bl ftrace_return_to_handler move ra, a0 /* Restore return value regs */ - PTR_L a0, sp, 0 - PTR_L a1, sp, SZREG - PTR_ADDI sp, sp, 2 * SZREG + PTR_L a0, sp, FGRET_REGS_A0 + PTR_L a1, sp, FGRET_REGS_A1 + PTR_ADDI sp, sp, FGRET_REGS_SIZE jr ra SYM_CODE_END(return_to_handler) |