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John David Anglin 7e4967e913 parisc: Fix handling off probe non-access faults 
[ Upstream commit e00b0a2ab8ec019c344e53bfc76e31c18bb587b7 ]

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 14:40:32 +02:00
..
Kbuild local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
agp.h
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alternative.h parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU 2019-08-12 19:17:39 +02:00
asm-offsets.h
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asmregs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153 2019-05-30 11:26:32 -07:00
assembly.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153 2019-05-30 11:26:32 -07:00
atomic.h Merge branch 'parisc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2020-08-12 12:41:15 -07:00
barrier.h parisc: Add alternative patching to synchronize_caches define 2020-10-15 08:10:38 +02:00
bitops.h parisc: Convert to BIT_MASK() and BIT_WORD() 2020-07-21 08:04:39 +02:00
bug.h
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bugs.h
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cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheflush.h parisc/kmap: remove duplicate kmap code 2020-06-04 19:06:22 -07:00
checksum.h saner calling conventions for csum_and_copy_..._user() 2020-08-20 15:45:15 -04:00
cmpxchg.h parisc: avoid a warning on u8 cast for cmpxchg on u8 pointers 2021-04-14 08:41:59 +02:00
compat.h compat: lift compat_s64 and compat_u64 to <asm-generic/compat.h> 2020-09-17 13:00:46 -04:00
compat_ucontext.h
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delay.h
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dma-mapping.h parisc: move internal implementation details out of <asm/dma-mapping.h> 2019-02-21 20:37:11 +01:00
dma.h
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dwarf.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
eisa_bus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
eisa_eeprom.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
elf.h Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-09 13:33:54 -07:00
fb.h
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fixmap.h parisc: add kexec syscall support 2019-09-08 15:37:04 +02:00
floppy.h floppy: use symbolic register names in the parisc port 2020-05-12 19:34:53 +03:00
ftrace.h parisc/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS support 2019-08-03 08:56:57 +02:00
futex.h parisc: Fix mask used to select futex spinlock 2021-12-29 12:26:02 +01:00
grfioctl.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
hardirq.h parisc: Count IPI function call interrupts 2019-02-21 20:37:11 +01:00
hardware.h parisc: Use per-pagetable spinlock 2019-05-03 23:47:41 +02:00
hash.h
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hugetlb.h mm/hugetlb: define a generic fallback for arch_clear_hugepage_flags() 2020-06-03 20:09:46 -07:00
ide.h
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io.h iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
irq.h
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irqflags.h
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jump_label.h parisc: Add static branch and JUMP_LABEL feature 2019-05-06 00:10:03 +02:00
kbdleds.h
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kexec.h parisc: fix compilation when KEXEC=n and KEXEC_FILE=y 2019-12-15 21:05:38 +01:00
kgdb.h parisc: add KGDB support 2019-05-03 23:47:38 +02:00
kmap_types.h
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kprobes.h parisc: add kprobe_fault_handler() 2019-07-21 11:01:55 +02:00
ldcw.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
led.h
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linkage.h
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machdep.h
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mckinley.h
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mmu.h
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mmu_context.h mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
mmzone.h parisc: Switch from DISCONTIGMEM to SPARSEMEM 2019-05-03 23:47:40 +02:00
module.h
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page.h parisc: Use absolute_pointer() to define PAGE0 2021-09-30 10:11:07 +02:00
parisc-device.h
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parport.h
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patch.h parisc: add support for patching multiple words 2019-06-08 12:56:25 +02:00
pci.h parisc: remove the HBA_DATA macro 2019-02-21 20:37:12 +01:00
pdc.h parisc: add __pdc_cpu_rendezvous() 2019-09-08 15:19:58 +02:00
pdc_chassis.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 176 2019-05-30 11:29:19 -07:00
pdcpat.h parisc: Add constant for PDC_PAT_COMPLEX firmware call 2019-02-21 20:37:13 +01:00
perf.h
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perf_event.h
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pgalloc.h parisc: fix PMD pages allocation by restoring pmd_alloc_one() 2020-08-16 10:53:13 -07:00
pgtable.h mm: consolidate pte_index() and pte_offset_*() definitions 2020-06-09 09:39:14 -07:00
prefetch.h
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processor.h treewide: remove current_text_addr 2018-10-31 08:54:12 -07:00
psw.h parisc: asm: psw.h: missing header guard 2019-06-25 14:52:26 +02:00
ptrace.h parisc: add functions required by KPROBE_EVENTS 2019-05-03 23:47:39 +02:00
ropes.h
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rt_sigframe.h
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runway.h
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sections.h parisc: Add alternative coding infrastructure 2018-10-17 17:22:26 +02:00
serial.h
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shmparam.h
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signal.h
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smp.h
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socket.h parisc: Define O_NONBLOCK to become 000200000 2020-10-15 08:10:38 +02:00
sparsemem.h parisc: Switch from DISCONTIGMEM to SPARSEMEM 2019-05-03 23:47:40 +02:00
special_insns.h parisc: Fix lpa and lpa_user defines 2022-01-27 10:54:26 +01:00
spinlock.h parisc: Improve spinlock handling 2020-10-15 08:10:39 +02:00
spinlock_types.h parisc: Rework arch_rw locking functions 2020-04-05 22:29:55 +02:00
string.h Revert "parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat" 2021-09-03 10:09:31 +02:00
superio.h
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switch_to.h
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syscall.h parisc: define syscall_get_error() 2019-07-16 19:23:24 -07:00
termios.h
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thread_info.h
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timex.h locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header 2020-08-06 16:13:13 +02:00
tlb.h parisc: use pgtable-nopXd instead of 4level-fixup 2019-12-04 19:44:15 -08:00
tlbflush.h parisc: Use per-pagetable spinlock 2019-05-03 23:47:41 +02:00
topology.h
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traps.h parisc: Fix handling off probe non-access faults 2022-04-08 14:40:32 +02:00
uaccess.h uaccess: remove segment_eq 2020-08-12 10:57:58 -07:00
ucontext.h
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unaligned.h
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unistd.h parisc: Wire up clone3 syscall 2019-07-17 23:11:28 +02:00
unwind.h
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vmalloc.h mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h> 2019-12-10 10:12:55 +01:00