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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/include/asm/ftrace.h | |
| parent | 38638ffa6059049334b4d87bd4d85cf3418b5e27 (diff) | |
| download | linux-b97aec082b51a0728adc9f69494826d32e0d1f8f.tar.gz linux-b97aec082b51a0728adc9f69494826d32e0d1f8f.tar.bz2 linux-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/include/asm/ftrace.h')
| -rw-r--r-- | arch/riscv/include/asm/ftrace.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index d47d87c2d7e3..740a979171e5 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -111,4 +111,25 @@ int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #endif /* CONFIG_DYNAMIC_FTRACE */ +#ifndef __ASSEMBLY__ +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +struct fgraph_ret_regs { + unsigned long a1; + unsigned long a0; + unsigned long s0; + unsigned long ra; +}; + +static inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->a0; +} + +static inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->s0; +} +#endif /* ifdef CONFIG_FUNCTION_GRAPH_TRACER */ +#endif + #endif /* _ASM_RISCV_FTRACE_H */ |