Messages in this thread | | | Date | Wed, 25 May 2022 09:43:07 -0400 | From | Steven Rostedt <> | Subject | Re: [RFC PATCH -next v2 3/4] arm64/ftrace: support dynamically allocated trampolines |
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On Wed, 25 May 2022 13:17:30 +0100 Mark Rutland <mark.rutland@arm.com> wrote:
> For arm64 I'd like to make this static, and have ftrace *always* capture a > minimal set of ftrace_regs, which would be: > > X0 to X8 inclusive > SP > PC > LR > FP > > Since X0 to X8 + SP is all that we need for arguments and return values (per > the calling convention we use), and PC+LR+FP gives us everything we need for > unwinding and live patching. > > I *might* want to add x18 to that when SCS is enabled, but I'm not immediately > sure.
Does arm64 have HAVE_DYNAMIC_FTRACE_WITH_ARGS enabled? If so, then having the normal ftrace call back save the above so that all functions have it available would be useful.
-- Steve
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