Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH] arm64: ptrace: Add function argument access API | Date | Mon, 18 Mar 2019 16:59:02 +0900 |
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Add regs_get_argument() which returns N th argument of the function call. On arm64, it supports up to 8th argument. Note that this chooses most probably assignment, in some case it can be incorrect (e.g. passing data structure or floating point etc.)
This enables ftrace kprobe events to access kernel function arguments via $argN syntax.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/ptrace.h | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 117b2541ef3d..6ba0da4be73c 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -148,6 +148,7 @@ config ARM64 select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_REGS_AND_STACK_ACCESS_API + select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_RCU_TABLE_FREE select HAVE_RCU_TABLE_INVALIDATE select HAVE_RSEQ diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index ec60174c8c18..cfa1bc9b8b70 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -305,6 +305,24 @@ static inline unsigned long regs_return_value(struct pt_regs *regs) return regs->regs[0]; } +/** + * regs_get_kernel_argument() - get Nth function argument in kernel + * @regs: pt_regs of that context + * @n: function argument number (start from 0) + * + * regs_get_argument() returns @n th argument of the function call. + * Note that this chooses most probably assignment, in some case + * it can be incorrect. + */ +static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, + unsigned int n) +{ +#define NR_REG_ARGUMENTS 8 + if (n < NR_REG_ARGUMENTS) + return regs_get_register(regs, n << 3); + return 0; +} + /* We must avoid circular header include via sched.h */ struct task_struct; int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
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