powerpc/ftrace: Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on PPC32

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Unlike PPC64, PPC32 doesn't require any special compiler option
to get _mcount() call not clobbering registers.

Provide ftrace_regs_caller() and ftrace_regs_call() and activate
HAVE_DYNAMIC_FTRACE_WITH_REGS.

That's heavily copied from ftrace_64_mprofile.S

For the time being leave livepatching aside, it will come with
following patch.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1862dc7719855cc2a4eec80920d94c955877557e.1635423081.git.christophe.leroy@csgroup.eu

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This commit is contained in:

Christophe Leroy 2021-10-28 14:24:04 +02:00 • committed by Michael Ellerman

parent c93d4f6ecf

commit 7dfbfb87c2

4 changed files with 125 additions and 12 deletions

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4

arch/powerpc/Kconfig

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8

arch/powerpc/kernel/module_32.c

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16

arch/powerpc/kernel/trace/ftrace.c

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111

arch/powerpc/kernel/trace/ftrace_32.S

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