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LoongArch: Override higher address bits in JUMP_VIRT_ADDR

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commit 1098efd299 upstream.

In JUMP_VIRT_ADDR we are performing an or calculation on address value
directly from pcaddi.

This will only work if we are currently running from direct 1:1 mapping
addresses or firmware's DMW is configured exactly same as kernel. Still,
we should not rely on such assumption.

Fix by overriding higher bits in address comes from pcaddi, so we can
get rid of or operator.

Cc: stable@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiaxun Yang 2024-06-03 15:45:53 +08:00 committed by Greg Kroah-Hartman
parent ae9e39a2fb
commit ca6d6d872a
1 changed files with 1 additions and 1 deletions
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2
arch/loongarch/include/asm/stackframe.h
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@ -41,7 +41,7 @@
.macro JUMP_VIRT_ADDR temp1 temp2
li.d \temp1, CACHE_BASE
pcaddi \temp2, 0
or \temp1, \temp1, \temp2
bstrins.d \temp1, \temp2, (DMW_PABITS - 1), 0
jirl zero, \temp1, 0xc
.endm