Messages in this thread Patch in this message | | | Date | Wed, 07 Feb 2018 15:24:06 -0500 | From | Steven Rostedt <> | Subject | [PATCH 04/20 v2] tracing/x86: Add arch_get_func_args() function |
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From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Add function to get the function arguments from pt_regs.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- arch/x86/kernel/ftrace.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 01ebcb6f263e..5e845c8cf89d 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -46,6 +46,34 @@ int ftrace_arch_code_modify_post_process(void) return 0; } +int arch_get_func_args(struct pt_regs *regs, + int start, int end, long *args) +{ +#ifdef CONFIG_X86_64 +# define MAX_ARGS 6 +# define INIT_REGS \ + { regs->di, regs->si, regs->dx, \ + regs->cx, regs->r8, regs->r9 \ + } +#else +# define MAX_ARGS 3 +# define INIT_REGS \ + { regs->ax, regs->dx, regs->cx } +#endif + if (!regs) + return MAX_ARGS; + + { + long pt_args[] = INIT_REGS; + int i; + + for (i = start; i <= end && i < MAX_ARGS; i++) + args[i - start] = pt_args[i]; + + return i - start; + } +} + union ftrace_code_union { char code[MCOUNT_INSN_SIZE]; struct { -- 2.15.1
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