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[RFC,v1,0/2] xen/arm: Annotate code symbols

Message ID 20240410091947.1498695-1-edgar.iglesias@gmail.com (mailing list archive)
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Series xen/arm: Annotate code symbols | expand

Message

Edgar E. Iglesias April 10, 2024, 9:19 a.m. UTC 
From: "Edgar E. Iglesias" <edgar.iglesias@amd.com>

On the way towards Xen safety certification we're evaluating the use
of tools to collect code-coverage/profiling information from execution
traces. Some tools rely on ELF symbols for code being declared with
type FUNC and having a symbol size.

We currently annotate some symbols but not all. Also, there seems to be
different ways to do the annotation so I'm sending out this RFC to first
figure out how we want to do things before I go ahead and edit more
of the ARM port.

In this first try I've followed the style from commit:
b3a9037550 x86: annotate entry points with type and size
IIUC, prefering to use macros from the generic framework in
xen/linkage.h in favor of ENTRY/ENDPROC.

But perhaps we would like to keep using ENTRY() for entry points
into the hypervisor?
Another way could be to add .type name, %function to the ENTRY macro
and use END from xen/linkage.h.

Or we can keep using ENTRY/GLOBAL/ENDPROC.

Any thoughts or better ideas?

Best regards,
Edgar

Edgar E. Iglesias (2):
  xen/arm64: entry: Use xen/linkage.h to annotate symbols
  xen/arm64: entry: Add missing code symbol annotations

 xen/arch/arm/arm64/entry.S | 72 +++++++++++++++++++++++++-------------
 1 file changed, 48 insertions(+), 24 deletions(-)