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arm64/lib: copy_page: avoid x18 register in assembler code

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Register x18 will no longer be used as a caller save register in the
future, so stop using it in the copy_page() code.

Link: https://patchwork.kernel.org/patch/9836869/
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[Sami: changed the offset and bias to be explicit]
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2019-12-06 14:13:38 -08:00 committed by Will Deacon
parent e3ec6582d1
commit 7f153ccb9b
1 changed files with 19 additions and 19 deletions
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38
arch/arm64/lib/copy_page.S
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@ -34,45 +34,45 @@ alternative_else_nop_endif
ldp x14, x15, [x1, #96]
ldp x16, x17, [x1, #112]
mov x18, #(PAGE_SIZE - 128)
add x0, x0, #256
add x1, x1, #128
1:
subs x18, x18, #128
tst x0, #(PAGE_SIZE - 1)
alternative_if ARM64_HAS_NO_HW_PREFETCH
prfm pldl1strm, [x1, #384]
alternative_else_nop_endif
stnp x2, x3, [x0]
stnp x2, x3, [x0, #-256]
ldp x2, x3, [x1]
stnp x4, x5, [x0, #16]
stnp x4, x5, [x0, #16 - 256]
ldp x4, x5, [x1, #16]
stnp x6, x7, [x0, #32]
stnp x6, x7, [x0, #32 - 256]
ldp x6, x7, [x1, #32]
stnp x8, x9, [x0, #48]
stnp x8, x9, [x0, #48 - 256]
ldp x8, x9, [x1, #48]
stnp x10, x11, [x0, #64]
stnp x10, x11, [x0, #64 - 256]
ldp x10, x11, [x1, #64]
stnp x12, x13, [x0, #80]
stnp x12, x13, [x0, #80 - 256]
ldp x12, x13, [x1, #80]
stnp x14, x15, [x0, #96]
stnp x14, x15, [x0, #96 - 256]
ldp x14, x15, [x1, #96]
stnp x16, x17, [x0, #112]
stnp x16, x17, [x0, #112 - 256]
ldp x16, x17, [x1, #112]
add x0, x0, #128
add x1, x1, #128
b.gt 1b
b.ne 1b
stnp x2, x3, [x0]
stnp x4, x5, [x0, #16]
stnp x6, x7, [x0, #32]
stnp x8, x9, [x0, #48]
stnp x10, x11, [x0, #64]
stnp x12, x13, [x0, #80]
stnp x14, x15, [x0, #96]
stnp x16, x17, [x0, #112]
stnp x2, x3, [x0, #-256]
stnp x4, x5, [x0, #16 - 256]
stnp x6, x7, [x0, #32 - 256]
stnp x8, x9, [x0, #48 - 256]
stnp x10, x11, [x0, #64 - 256]
stnp x12, x13, [x0, #80 - 256]
stnp x14, x15, [x0, #96 - 256]
stnp x16, x17, [x0, #112 - 256]
ret
ENDPROC(copy_page)