From: Helge Deller deller@gmx.de
[ Upstream commit 169d1a4a2adb2c246396c56aa2f9eec3868546f1 ]
The extru instruction leaves the most significant 32 bits of the target register in an undefined state on PA 2.0 systems. Provide a macro to safely use extru on 32- and 64-bit machines.
Suggested-by: John David Anglin dave.anglin@bell.net Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/parisc/include/asm/assembly.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h index a39250cb7dfcf..0c95030017e8f 100644 --- a/arch/parisc/include/asm/assembly.h +++ b/arch/parisc/include/asm/assembly.h @@ -135,6 +135,17 @@ extrd,u \r, 63-(\sa), 64-(\sa), \t .endm
+ /* Extract unsigned for 32- and 64-bit + * The extru instruction leaves the most significant 32 bits of the + * target register in an undefined state on PA 2.0 systems. */ + .macro extru_safe r, p, len, t +#ifdef CONFIG_64BIT + extrd,u \r, 32+(\p), \len, \t +#else + extru \r, \p, \len, \t +#endif + .endm + /* load 32-bit 'value' into 'reg' compensating for the ldil * sign-extension when running in wide mode. * WARNING!! neither 'value' nor 'reg' can be expressions