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| author |   Helge Deller <deller@gmx.de> | 2021-11-19 22:16:37 +0100 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2021-11-22 07:37:31 +0100 |
| commit | 169d1a4a2adb2c246396c56aa2f9eec3868546f1 (patch) | |
| tree | df4284092a168b9639225c3a7f2b9fda16cce31f /arch/parisc | |
| parent | parisc: Increase FRAME_WARN to 2048 bytes on parisc (diff) | |
| download | linux-dev-169d1a4a2adb2c246396c56aa2f9eec3868546f1.tar.xz linux-dev-169d1a4a2adb2c246396c56aa2f9eec3868546f1.zip | |
parisc: Provide an extru_safe() macro to extract unsigned bits
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>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/include/asm/assembly.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h index 39e7985086f9..6d13ae236fcb 100644 --- a/arch/parisc/include/asm/assembly.h +++ b/arch/parisc/include/asm/assembly.h @@ -147,6 +147,17 @@ 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 |