[Bug target/96061] New: Please support 'no_caller_saved_registers' attribute on aarch64 (or maybe on all targets)
alex.popov at linux dot com
Sat Jul 4 13:36:41 GMT 2020
Bug ID: 96061
Summary: Please support 'no_caller_saved_registers' attribute
on aarch64 (or maybe on all targets)
Assignee: unassigned at gcc dot gnu.org
Reporter: alex.popov at linux dot com
Target Milestone: ---
This is an enhancement request.
GCC currently supports 'no_caller_saved_registers' attribute only for x86.
Clang supports it for all target architectures.
It would be very useful for Linux kernel, if GCC supported
'no_caller_saved_registers' attribute for at least aarch64. In particular, that
would allow to avoid useless work with caller-saved registers caused by
STACKLEAK GCC plugin instrumentation for the Linux kernel on aarch64.
This kernel patch uses 'no_caller_saved_registers' to fix the described issue
(the patch is accepted for the mainline kernel)
That GCC enhancement can be useful for _mcount (gprof) as well.
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