John David Anglin b3ea76bda7 parisc: Fix handling off probe non-access faults ... [ Upstream commit e00b0a2ab8 ] Currently, the parisc kernel does not fully support non-access TLB fault handling for probe instructions. In the fast path, we set the target register to zero if it is not a shadowed register. The slow path is not implemented, so we call do_page_fault. The architecture indicates that non-access faults should not cause a page fault from disk. This change adds to code to provide non-access fault support for probe instructions. It also modifies the handling of faults on userspace so that if the address lies in a valid VMA and the access type matches that for the VMA, the probe target register is set to one. Otherwise, the target register is set to zero. This was done to make probe instructions more useful for userspace. Probe instructions are not very useful if they set the target register to zero whenever a page is not present in memory. Nominally, the purpose of the probe instruction is determine whether read or write access to a given address is allowed. This fixes a problem in function pointer comparison noticed in the glibc testsuite (stdio-common/tst-vfprintf-user-type). The same problem is likely in glibc (_dl_lookup_address). V2 adds flush and lpa instruction support to handle_nadtlb_fault. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-04-08 14:23:56 +02:00
..
boot	parisc: Add missing FORCE prerequisite in Makefile	2021-09-09 12:44:30 +02:00
configs	configs: remove the obsolete CONFIG_INPUT_POLLDEV	2021-09-08 11:50:28 -07:00
include	parisc: Fix handling off probe non-access faults	2022-04-08 14:23:56 +02:00
kernel	parisc: Fix handling off probe non-access faults	2022-04-08 14:23:56 +02:00
lib	parisc: Add ioread64_lo_hi() and iowrite64_lo_hi()	2022-02-23 12:03:04 +01:00
math-emu	parisc: math-emu: Fix fall-through warnings	2021-09-01 22:18:18 +02:00
mm	parisc: Fix handling off probe non-access faults	2022-04-08 14:23:56 +02:00
defpalo.conf
install.sh	parisc: Fix "make install" on newer debian releases	2021-12-08 09:04:55 +01:00
Kbuild	parisc: move core-y in arch/parisc/Makefile to arch/parisc/Kbuild	2021-08-30 10:18:25 +02:00
Kconfig	firmware: include drivers/firmware/Kconfig unconditionally	2021-10-07 16:51:26 +02:00
Kconfig.debug	tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig	2021-08-16 11:37:21 -04:00
Makefile	parisc: Fix KBUILD_IMAGE for self-extracting kernel	2021-12-08 09:04:55 +01:00
nm