powerpc/64: use 32-bit immediate for STACK_FRAME_REGS_MARKER

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Using a 32-bit constant for this marker allows it to be loaded with
two ALU instructions, like 32-bit. This avoids a TOC entry and a
TOC load that depends on the r2 value that has just been loaded from
the PACA.

This changes the value for 32-bit as well, so both have the same
value in the low 4 bytes and 64-bit has 0 in the top bytes.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926034057.2360083-2-npiggin@gmail.com

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Nicholas Piggin 2022-09-26 13:40:53 +10:00 • committed by Michael Ellerman

parent 4b2a9315f2

commit 17773afdcd

6 changed files with 10 additions and 23 deletions

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4

arch/powerpc/include/asm/ptrace.h

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arch/powerpc/kernel/entry_32.S

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arch/powerpc/kernel/exceptions-64e.S

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arch/powerpc/kernel/exceptions-64s.S

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arch/powerpc/kernel/head_64.S

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arch/powerpc/kernel/interrupt_64.S

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