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OpenCloudOS-Kernel/arch/parisc/include/asm
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Helge Deller d19f5e41b3 parisc: Clean up fixup routines for get_user()/put_user() 
Al Viro noticed that userspace accesses via get_user()/put_user() can be
simplified a lot with regard to usage of the exception handling.

This patch implements a fixup routine for get_user() and put_user() in such
that the exception handler will automatically load -EFAULT into the register
%r8 (the error value) in case on a fault on userspace.  Additionally the fixup
routine will zero the target register on fault in case of a get_user() call.
The target register is extracted out of the faulting assembly instruction.

This patch brings a few benefits over the old implementation:
1. Exception handling gets much cleaner, easier and smaller in size.
2. Helper functions like fixup_get_user_skip_1 (all of fixup.S) can be dropped.
3. No need to hardcode %r9 as target register for get_user() any longer. This
   helps the compiler register allocator and thus creates less assembler
   statements.
4. No dependency on the exception_data contents any longer.
5. Nested faults will be handled cleanly.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Helge Deller <deller@gmx.de>
 		2017-03-29 21:50:36 +02:00
..
Kbuild kprobes: move kprobe declarations to asm-generic/kprobes.h 2017-02-27 18:43:45 -08:00
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
asmregs.h
…
assembly.h parisc: Use generic extable search and sort routines 2016-03-23 16:00:46 +01:00
atomic.h locking/atomic: Remove linux/atomic.h:atomic_fetch_or() 2016-06-16 10:48:32 +02:00
bitops.h parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header 2017-01-28 21:54:23 +01:00
bug.h [PARISC] fix missing TAINT_WARN problem 2012-06-05 14:10:17 +09:00
bugs.h
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cache.h arch: Introduce post-init read-only memory 2016-02-22 08:51:38 +01:00
cacheflush.h parisc: Optimize flush_kernel_vmap_range and invalidate_kernel_vmap_range 2017-03-15 20:57:33 +01:00
checksum.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
cmpxchg.h parisc: Add native high-resolution sched_clock() implementation 2016-05-22 21:39:25 +02:00
compat.h parisc: Fix SIGSYS signals in compat case 2016-03-31 12:28:37 +02:00
compat_ucontext.h
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delay.h parisc: make udelay() SMP-safe 2013-11-07 22:28:26 +01:00
dma-mapping.h treewide: Consolidate get_dma_ops() implementations 2017-01-24 12:23:35 -05:00
dma.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
dwarf.h parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
eisa_bus.h
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eisa_eeprom.h parisc: Fix typos in eisa_eeprom.h 2016-05-22 21:57:40 +02:00
elf.h parisc: Enable KASLR 2016-12-12 22:21:21 +01:00
fb.h
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fixmap.h parisc: rename parisc's vmalloc_start to parisc_vmalloc_start 2009-09-27 23:27:04 -04:00
floppy.h parisc: Use parentheses around expression in floppy.h 2016-03-01 22:51:04 +01:00
ftrace.h parisc: Add syscall tracepoint support 2016-05-22 21:38:47 +02:00
futex.h parisc: Update futex.h to match generic implementation 2016-05-22 21:48:54 +02:00
grfioctl.h
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hardirq.h parisc: do not count IPI calls twice 2013-11-07 22:28:54 +01:00
hardware.h parisc: drop include of asm/pdc.h from asm/hardware.h 2012-05-10 15:12:08 -07:00
hash.h parisc: Add <asm/hash.h> 2016-08-02 16:44:29 +02:00
hugetlb.h parisc: Protect huge page pte changes with spinlocks 2016-01-16 19:19:14 +01:00
ide.h
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io.h parisc: Define ioremap_uc and ioremap_wc 2015-09-08 15:30:37 +02:00
irq.h [PARISC] Convert to new irq_chip functions 2011-02-10 10:22:14 -06:00
irqflags.h Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
kbdleds.h keyboard: Use BIOS Keyboard variable to set Numlock 2012-05-08 14:19:41 -07:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
ldcw.h parisc: Fix typo in ldcw.h 2016-05-22 21:56:37 +02:00
led.h
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linkage.h parisc: Add cfi_startproc and cfi_endproc to assembly code 2016-10-05 22:54:40 +02:00
machdep.h
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mckinley.h
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mmu.h
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mmu_context.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
mmzone.h parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50 (part 2) 2013-06-18 20:20:21 +02:00
module.h Make most arch asm/module.h files use asm-generic/module.h 2012-09-28 14:31:03 +09:30
page.h parisc: Add defines for Huge page support 2015-11-22 12:22:34 +01:00
parisc-device.h parisc: Fix interrupt routing for C8000 serial ports 2013-07-31 23:42:32 +02:00
parport.h ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
pci.h PCI: Move pci_dma_* helpers to common code 2016-03-07 10:40:02 -06:00
pdc.h parisc: Imporove debug info about space registers and TLB configuration 2016-01-12 22:12:09 +01:00
pdc_chassis.h
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pdcpat.h parisc: Enhance CPU detection code on PAT machines 2016-12-12 22:28:09 +01:00
perf.h
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perf_event.h irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
pgalloc.h parisc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable.h parisc: Purge TLB before setting PTE 2016-12-07 08:56:40 +01:00
prefetch.h [PARISC] fix panic on prefetch(NULL) on PA7300LC 2012-05-16 13:15:21 +01:00
processor.h Merge branch 'parisc-4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2016-12-21 10:47:13 -08:00
psw.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
ptrace.h parisc: add kernel audit feature 2013-11-07 22:27:20 +01:00
ropes.h
…
rt_sigframe.h
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runway.h
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sections.h
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serial.h parisc: remove empty SERIAL_PORT_DFNS in serial.h 2013-11-30 21:02:18 +01:00
shmparam.h parisc: change value of SHMLBA from 0x00400000 to PAGE_SIZE 2014-04-13 15:00:53 +02:00
signal.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-02-23 18:50:11 -08:00
smp.h [PARISC] Fix parisc compile failure after smp: Add task_struct argument to __cpu_up() 2012-05-25 12:35:45 +01:00
socket.h parisc: break out SOCK_NONBLOCK define to own asm header file 2013-11-19 23:36:17 +01:00
special_insns.h parisc: optimize mtsp(0,sr) inline assembly 2013-07-09 22:09:21 +02:00
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
string.h
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superio.h
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switch_to.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
syscall.h parisc: Add syscall tracepoint support 2016-05-22 21:38:47 +02:00
termios.h UAPI: (Scripted) Disintegrate arch/parisc/include/asm 2012-10-16 21:28:05 +01:00
thread_info.h parisc: Drop TIF_RESTORE_SIGMASK and switch to generic code 2016-12-29 21:52:36 +01:00
timex.h Disintegrate asm/system.h for PA-RISC 2012-03-28 18:30:02 +01:00
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results 2015-07-10 21:47:47 +02:00
traps.h parisc: Show trap name in kernel crash 2016-10-11 20:52:47 +02:00
uaccess.h parisc: Clean up fixup routines for get_user()/put_user() 2017-03-29 21:50:36 +02:00
ucontext.h
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unaligned.h
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unistd.h sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL 2014-06-04 16:54:14 -07:00
unwind.h
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