Helge Deller df1d445e7f parisc: Fix exception handler for fldw and fstw instructions ... commit 7ae1f5508d upstream. The exception handler is broken for unaligned memory acceses with fldw and fstw instructions, because it trashes or uses randomly some other floating point register than the one specified in the instruction word on loads and stores. The instruction "fldw 0(addr),%fr22L" (and the other fldw/fstw instructions) encode the target register (%fr22) in the rightmost 5 bits of the instruction word. The 7th rightmost bit of the instruction word defines if the left or right half of %fr22 should be used. While processing unaligned address accesses, the FR3() define is used to extract the offset into the local floating-point register set. But the calculation in FR3() was buggy, so that for example instead of %fr22, register %fr12 [((22 * 2) & 0x1f) = 12] was used. This bug has been since forever in the parisc kernel and I wonder why it wasn't detected earlier. Interestingly I noticed this bug just because the libime debian package failed to build on *native* hardware, while it successfully built in qemu. This patch corrects the bitshift and masking calculation in FR3(). Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-31 17:15:13 +02:00
..
boot	vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG	2020-09-01 09:50:35 +02:00
configs	parisc: disable CONFIG_IDE in defconfigs	2020-10-15 08:10:38 +02:00
include	parisc/stifb: Fix fb_is_primary_device() only available with CONFIG_FB_STI	2022-06-29 08:59:53 +02:00
kernel	parisc: Fix exception handler for fldw and fstw instructions	2022-08-31 17:15:13 +02:00
lib	parisc: Add ioread64_lo_hi() and iowrite64_lo_hi()	2022-02-23 12:00:58 +01:00
math-emu	parisc: math-emu: Fix fall-through warnings	2021-10-27 09:56:46 +02:00
mm	parisc: Fix handling off probe non-access faults	2022-04-08 14:40:32 +02:00
oprofile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
defpalo.conf
install.sh	parisc: Fix "make install" on newer debian releases	2021-12-08 09:03:28 +01:00
Kconfig	parisc: Enable ARCH_HAS_STRICT_MODULE_RWX	2022-06-29 08:59:53 +02:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	parisc: Fix KBUILD_IMAGE for self-extracting kernel	2021-12-08 09:03:28 +01:00
nm