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parisc: Avoid clobbering the C/B bits in the PSW with tophys and tovirt macros

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[ Upstream commit 4603fbaa76b5e703b38ac8cc718102834eb6e330 ]

Use add,l to avoid clobbering the C/B bits in the PSW.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John David Anglin 2024-02-23 16:40:51 +01:00 • committed by Ksawlii
parent a4f2b2bbaa
commit 9c5166dba1
1 changed files with 10 additions and 8 deletions
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18
arch/parisc/include/asm/assembly.h
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@ -83,26 +83,28 @@
* version takes two arguments: a src and destination register.
* However, the source and destination registers can not be
* the same register.
*
* We use add,l to avoid clobbering the C/B bits in the PSW.
*/
.macro tophys grvirt, grphys
ldil L%(__PAGE_OFFSET), \grphys
sub \grvirt, \grphys, \grphys
ldil L%(-__PAGE_OFFSET), \grphys
addl \grvirt, \grphys, \grphys
.endm
.macro tovirt grphys, grvirt
ldil L%(__PAGE_OFFSET), \grvirt
add \grphys, \grvirt, \grvirt
addl \grphys, \grvirt, \grvirt
.endm
.macro tophys_r1 gr
ldil L%(__PAGE_OFFSET), %r1
sub \gr, %r1, \gr
ldil L%(-__PAGE_OFFSET), %r1
addl \gr, %r1, \gr
.endm
.macro tovirt_r1 gr
ldil L%(__PAGE_OFFSET), %r1
add \gr, %r1, \gr
addl \gr, %r1, \gr
.endm
.macro delay value