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| author | Ard Biesheuvel <ardb@kernel.org> | 2020-09-21 00:10:16 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-29 13:44:53 +0100 |
| commit | 1c87074825a02aa26b1f017baa3f0feb23fb48f0 (patch) | |
| tree | 7c62465b613326373ee9d00cb02faedb9d75d0ab | |
| parent | 1cbabe5b58bf57aaa05267ddcee834902ce7f64d (diff) | |
| download | linux-stable-1c87074825a02aa26b1f017baa3f0feb23fb48f0.tar.gz linux-stable-1c87074825a02aa26b1f017baa3f0feb23fb48f0.tar.bz2 linux-stable-1c87074825a02aa26b1f017baa3f0feb23fb48f0.zip | |
ARM: p2v: fix handling of LPAE translation in BE mode
[ Upstream commit 4e79f0211b473f8e1eab8211a9fd50cc41a3a061 ]
When running in BE mode on LPAE hardware with a PA-to-VA translation
that exceeds 4 GB, we patch bits 39:32 of the offset into the wrong
byte of the opcode. So fix that, by rotating the offset in r0 to the
right by 8 bits, which will put the 8-bit immediate in bits 31:24.
Note that this will also move bit #22 in its correct place when
applying the rotation to the constant #0x400000.
Fixes: d9a790df8e984 ("ARM: 7883/1: fix mov to mvn conversion in case of 64 bit phys_addr_t and BE")
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/arm/kernel/head.S | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 04286fd9e09c..2e336acd68b0 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -674,11 +674,7 @@ ARM_BE8(rev16 ip, ip) bcc 1b bx lr #else -#ifdef CONFIG_CPU_ENDIAN_BE8 - moveq r0, #0x00004000 @ set bit 22, mov to mvn instruction -#else moveq r0, #0x400000 @ set bit 22, mov to mvn instruction -#endif b 2f 1: ldr ip, [r7, r3] #ifdef CONFIG_CPU_ENDIAN_BE8 @@ -687,7 +683,7 @@ ARM_BE8(rev16 ip, ip) tst ip, #0x000f0000 @ check the rotation field orrne ip, ip, r6, lsl #24 @ mask in offset bits 31-24 biceq ip, ip, #0x00004000 @ clear bit 22 - orreq ip, ip, r0 @ mask in offset bits 7-0 + orreq ip, ip, r0, ror #8 @ mask in offset bits 7-0 #else bic ip, ip, #0x000000ff tst ip, #0xf00 @ check the rotation field |