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linux/arch/sparc/include/asm
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David S. Miller 44922150d8 sparc64: Fix userspace FPU register corruptions. 
If we have a series of events from userpsace, with %fprs=FPRS_FEF,
like follows:

ETRAP
	ETRAP
		VIS_ENTRY(fprs=0x4)
		VIS_EXIT
		RTRAP (kernel FPU restore with fpu_saved=0x4)
	RTRAP

We will not restore the user registers that were clobbered by the FPU
using kernel code in the inner-most trap.

Traps allocate FPU save slots in the thread struct, and FPU using
sequences save the "dirty" FPU registers only.

This works at the initial trap level because all of the registers
get recorded into the top-level FPU save area, and we'll return
to userspace with the FPU disabled so that any FPU use by the user
will take an FPU disabled trap wherein we'll load the registers
back up properly.

But this is not how trap returns from kernel to kernel operate.

The simplest fix for this bug is to always save all FPU register state
for anything other than the top-most FPU save area.

Getting rid of the optimized inner-slot FPU saving code ends up
making VISEntryHalf degenerate into plain VISEntry.

Longer term we need to do something smarter to reinstate the partial
save optimizations.  Perhaps the fundament error is having trap entry
and exit allocate FPU save slots and restore register state.  Instead,
the VISEntry et al. calls should be doing that work.

This bug is about two decades old.

Reported-by: James Y Knight <jyknight@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-06 19:13:25 -07:00
..
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
apb.h
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
asm.h sparc: Add asm/asm.h 2008-12-09 00:50:13 -08:00
asmmacro.h sparc32: add support for run-time patching of leon/sun single instructions 2012-05-27 23:52:43 -07:00
atomic_32.h sparc32: Implement xchg and atomic_xchg using ATOMIC_HASH locks 2014-11-07 12:51:44 -08:00
atomic_64.h locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() 2014-10-03 06:06:23 +02:00
atomic.h
auxio_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
auxio_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
auxio.h sparc32: fix sparse warnings in auxio_32.c 2014-04-29 01:12:26 -04:00
backoff.h sparc64: Improvde documentation and readability of atomic backoff code. 2012-10-28 13:04:47 -07:00
barrier_32.h arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h 2014-01-12 10:37:15 +01:00
barrier_64.h locking/arch: Rename set_mb() to smp_store_mb() 2015-05-19 08:32:00 +02:00
barrier.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
bbc.h
bitext.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
bitops_32.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2014-06-19 07:50:07 -10:00
bitops_64.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2014-06-19 07:50:07 -10:00
bitops.h
btext.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
bug.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
bugs.h sparc64: Implement SSTATE purely using notifiers and initcalls. 2008-09-02 00:49:38 -07:00
cache.h sparc32: Remove completely unused code from asm/cache.h 2012-05-19 21:15:37 -07:00
cacheflush_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
cacheflush_64.h mm/debug_pagealloc: fix build failure on ppc and some other archs 2015-02-05 13:35:30 -08:00
cacheflush.h sparc32: use flushi when run-time patching in per_cpu_patch 2012-05-20 13:33:36 -07:00
cachetlb_32.h sparc32: Move cache and TLB flushes over to method ops. 2012-05-13 20:49:31 -07:00
chafsr.h
checksum_32.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2014-06-19 07:50:07 -10:00
checksum_64.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2014-06-19 07:50:07 -10:00
checksum.h
chmctrl.h
clock.h
cmpxchg_32.h arch: Remove __ARCH_HAVE_CMPXCHG 2015-05-13 10:55:42 +02:00
cmpxchg_64.h arch: Remove __ARCH_HAVE_CMPXCHG 2015-05-13 10:55:42 +02:00
cmpxchg.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
compat_signal.h sparc: switch to generic sigaltstack 2013-02-03 18:16:17 -05:00
compat.h sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
contregs.h sparc32: Remove sun4{,c} control reg definitions from contregs.h. 2012-05-11 21:29:17 -07:00
cpu_type.h sparc32: Remove sun4 and sun4c from enum sparc_cpu. 2012-05-12 00:23:23 -07:00
cpudata_32.h sparc: Replace __get_cpu_var uses 2014-08-26 13:45:55 -04:00
cpudata_64.h sparc64: Setup sysfs to mark LDOM sockets, cores and threads correctly 2015-04-22 15:42:56 -04:00
cpudata.h sparc: fix sparse warnings in cpu.c 2014-04-29 01:12:25 -04:00
current.h
dcr.h
dcu.h
delay_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
delay_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
delay.h
device.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
dma-mapping.h sparc: Add NOP dma_cache_sync() implementation. 2014-11-26 13:36:41 -08:00
dma.h sparc32: Convert mmu_* interfaces from btfixup to method ops. 2012-05-13 13:57:05 -07:00
ebus_dma.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
ecc.h
eeprom.h
elf_32.h default SET_PERSONALITY() in linux/elf.h 2013-02-26 02:46:08 -05:00
elf_64.h sparc64: Add detection for features new in SPARC-T4. 2012-08-18 23:02:36 -07:00
elf.h
estate.h
fb.h sparc: Really fix "console=" for serial consoles. 2010-08-16 12:26:09 -07:00
fbio.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
fhc.h sparc64: Rewrite central driver. 2008-08-31 20:56:15 -07:00
floppy_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
floppy_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
floppy.h
fpumacro.h
ftrace.h sparc64: fix sparse warning in ftrace.c 2014-05-18 19:01:35 -07:00
futex_32.h
futex_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
futex.h
gpio.h gpiolib/arches: Centralise bolierplate asm/gpio.h 2012-05-11 18:00:14 -06:00
hardirq_32.h hardirq: Make hardirq bits generic 2013-11-13 20:21:46 +01:00
hardirq_64.h hardirq: Make hardirq bits generic 2013-11-13 20:21:46 +01:00
hardirq.h
head_32.h sparc: Consistently use 'wr' and 'rd' instructions for ASRs. 2013-04-06 17:51:48 -04:00
head_64.h
head.h
hibernate.h sparc64: Hibernation support 2013-03-20 11:06:54 -07:00
highmem.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
hugetlb.h mm/hugetlb: remove arch_prepare/release_hugepage from arch headers 2015-06-25 17:00:35 -07:00
hvtramp.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
hw_irq.h
hypervisor.h sparc: perf: Add support M7 processor 2015-03-19 18:54:49 -07:00
ide.h
idprom.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
intr_queue.h
io_32.h arch/*/io.h: Add ioremap_wt() to all architectures 2015-06-07 15:28:57 +02:00
io_64.h arch/*/io.h: Add ioremap_wt() to all architectures 2015-06-07 15:28:57 +02:00
io-unit.h sparc32: fix sparse warning in io-unit.c 2014-05-18 19:01:26 -07:00
io.h sparc: io: remove duplicate relaxed accessors on sparc32 2014-11-19 10:19:45 +01:00
ioctls.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
iommu_32.h sparc32: fix sparse warning in iommu.c 2014-05-18 19:01:26 -07:00
iommu_64.h sparc: Make sparc64 use scalable lib/iommu-common.c functions 2015-04-18 12:32:59 -07:00
iommu.h
irq_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
irq_64.h sparc64: sparse irq 2014-10-05 16:53:40 -07:00
irq.h
irqflags_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
irqflags_64.h sparc/irqs: Do not trace arch_local_{*,irq_*} functions 2011-07-06 08:00:29 -07:00
irqflags.h
jump_label.h jump_label: Allow asm/jump_label.h to be included in assembly 2015-04-09 09:40:23 +02:00
Kbuild mm: clean up per architecture MM hook header files 2015-07-17 16:39:53 -07:00
kdebug_32.h sparc32: kernel/trace/trace.c wants DIE_OOPS 2008-11-01 21:44:01 -07:00
kdebug_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
kdebug.h
kgdb.h sparc64: fix sparse warning in kgdb_64.c 2014-05-18 19:01:34 -07:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h sparc64: fix sparse warning in kprobes.c 2014-05-18 19:01:34 -07:00
ldc.h sparc/ldc: create separate ldc_unbind from ldc_free 2014-12-11 18:52:45 -08:00
leon_amba.h sparc32, leon: Remove separate "ticker" timer for SMP 2013-06-19 02:10:29 -07:00
leon_pci.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
leon.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
lsu.h
machines.h sparc32: Trivial removal of sun4c references in comments. 2012-05-12 00:35:45 -07:00
mbus.h sparc32: Remove cypress cpu support. 2012-05-15 10:22:00 -07:00
mc146818rtc_32.h
mc146818rtc_64.h sparc64: Use generic CMOS driver. 2008-08-29 14:16:48 -07:00
mc146818rtc.h sparc32: fix sparse warnings in time_32.c 2014-05-18 19:01:27 -07:00
mdesc.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
memctrl.h sparc64: Add generic interface for registering a dimm printing handler. 2008-08-24 22:08:34 -07:00
mman.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
mmu_32.h sparc32: add irq + smp declarations to headers 2011-03-16 18:19:08 -07:00
mmu_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
mmu_context_32.h sparc32: centralize all mmu context handling in srmmu.c 2012-07-26 16:46:16 -07:00
mmu_context_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
mmu_context.h
mmu.h
mmzone.h Fix node_start/end_pfn() definition for mm/page_cgroup.c 2011-06-27 14:13:09 -07:00
msi.h
mxcc.h
nmi.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
ns87303.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
obio.h sparc32: move smp ipi to method ops 2012-05-14 14:05:07 -07:00
openprom.h sparc: Pass buffer pointer all the way down to prom_{get,put}char(). 2010-11-30 14:33:29 -08:00
oplib_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
oplib_64.h sparc64: Fix register corruption in top-most kernel stack frame during boot. 2014-10-24 09:52:49 -07:00
oplib.h
page_32.h sparc32: drop sparc_unmapped_base 2012-07-26 16:46:16 -07:00
page_64.h sparc64: Adjust vmalloc region size based upon available virtual address bits. 2014-10-05 16:53:40 -07:00
page.h sparc: move page_to_phys to page.h 2014-05-02 01:30:20 -04:00
parport.h sparc: include: asm: drop owner assignment from platform_drivers 2014-10-20 16:20:14 +02:00
pbm.h
pci_32.h PCI: Remove unused pci_dma_burst_advice() 2015-06-08 07:56:43 -05:00
pci_64.h PCI: Remove unused pci_dma_burst_advice() 2015-06-08 07:56:43 -05:00
pci.h pci-dma: add linux/pci-dma.h to linux/pci.h 2010-03-12 15:52:42 -08:00
pcic.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
pcr.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
percpu_32.h
percpu_64.h sparc64: Get rid of real_setup_per_cpu_areas(). 2009-06-16 04:56:23 -07:00
percpu.h
perf_event.h perf, arch: Cleanup perf-pmu init vs lockup-detector 2010-11-26 15:14:56 +01:00
pgalloc_32.h sparc32: fix sparse warnings in ioport.c 2014-04-29 01:12:25 -04:00
pgalloc_64.h sparc64: Switch to 4-level page tables. 2014-10-05 16:53:38 -07:00
pgalloc.h
pgtable_32.h mm: make FIRST_USER_ADDRESS unsigned long on all archs 2015-02-11 17:06:03 -08:00
pgtable_64.h mm: clarify that the function operates on hugepage pte 2015-06-24 17:49:44 -07:00
pgtable.h
pgtsrmmu.h sparc: drop pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pil.h sparc64: Reschedule KGDB capture to a software interrupt. 2009-03-18 23:51:57 -07:00
processor_32.h arch, locking: Ciao arch_mutex_cpu_relax() 2014-07-17 12:32:47 +02:00
processor_64.h arch, locking: Ciao arch_mutex_cpu_relax() 2014-07-17 12:32:47 +02:00
processor.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
prom.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
psr.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
ptrace.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
ross.h
rwsem.h rwsem: Move duplicate function prototypes to linux/rwsem.h 2011-01-27 12:30:39 +01:00
sbi.h
scratchpad.h
seccomp.h sparc: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h sparc32: add support for run-time patching of leon/sun single instructions 2012-05-27 23:52:43 -07:00
setup.h sparc64: Fix register corruption in top-most kernel stack frame during boot. 2014-10-24 09:52:49 -07:00
sfafsr.h
sfp-machine_32.h sparc32: remove cast from output constraints in math asm statements 2014-05-18 19:01:28 -07:00
sfp-machine_64.h
sfp-machine.h
shmparam_32.h sparc32: Remove sun4 and sun4c from enum sparc_cpu. 2012-05-12 00:23:23 -07:00
shmparam_64.h
shmparam.h
sigcontext.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
siginfo.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
signal.h consolidate kernel-side struct sigaction declarations 2013-02-03 15:09:22 -05:00
smp_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
smp_64.h sparc64: fix sparse warnings in smp_64.c 2014-05-18 19:01:31 -07:00
smp.h
sparsemem.h sparc64: Fix inconsistent max-physical-address defines. 2013-11-12 15:22:34 -08:00
spinlock_32.h sparc32: unbreak arch_write_unlock() 2011-08-15 14:35:19 -07:00
spinlock_64.h sparc64: remove unnecessary macros from spinlock_64.h 2011-08-15 14:35:18 -07:00
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
spinlock.h
spitfire.h sparc64: correctly recognise M6 and M7 cpu type 2014-09-09 15:24:10 -07:00
stacktrace.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
starfire.h arch: sparc: kernel: starfire.c: Remove unused function 2015-03-01 21:33:58 -08:00
string_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
string_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
string.h
sunbpp.h
swift.h
switch_to_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
switch_to_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
switch_to.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
syscall.h sparc: implement is_32bit_task 2014-09-23 16:21:27 -04:00
syscalls.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
termbits.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
termios.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
thread_info_32.h sparc: Fix execution domain removal 2015-04-12 21:03:31 +02:00
thread_info_64.h sparc: Remove signal translation and exec_domain 2015-04-12 21:03:21 +02:00
thread_info.h
timer_32.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
timer_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
timer.h
timex_32.h sparc32: generic clockevent support 2012-04-15 10:28:50 -07:00
timex_64.h
timex.h
tlb_32.h
tlb_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
tlb.h
tlbflush_32.h sparc32: Move cache and TLB flushes over to method ops. 2012-05-13 20:49:31 -07:00
tlbflush_64.h sparc64: Guard against flushing openfirmware mappings. 2014-08-04 20:16:00 -07:00
tlbflush.h
topology_32.h
topology_64.h Merge branch 'linus' into sched/core, to resolve conflict 2015-06-02 08:05:42 +02:00
topology.h
trap_block.h sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE 2015-05-31 22:15:01 -07:00
traps.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
tsb.h sparc64: Fix physical memory management regressions with large max_phys_bits. 2014-10-05 16:53:39 -07:00
tsunami.h
ttable.h sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
turbosparc.h
uaccess_32.h sparc32: nocheck uaccess coding style tweaks 2015-01-13 15:24:14 +02:00
uaccess_64.h sparc64: perf: Add sanity checking on addresses in user stack 2015-06-25 06:01:02 -07:00
uaccess.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
unaligned.h
unistd.h sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL 2014-06-04 16:54:14 -07:00
upa.h
user.h
vaddrs.h sparc32: drop fixmap.h 2012-07-26 16:46:16 -07:00
vga.h BUG: headers with BUG/BUG_ON etc. need linux/bug.h 2012-03-04 17:54:34 -05:00
viking.h
vio.h vio: create routines for inc,dec vio dring indexes 2014-12-11 18:52:45 -08:00
visasm.h sparc64: Fix userspace FPU register corruptions. 2015-08-06 19:13:25 -07:00
winmacro.h sparc32: Implement hard_smp_processor_id() via instruction patching. 2012-05-14 13:31:38 -07:00
xor_32.h
xor_64.h sparc: drop use of extern for prototypes in arch/sparc/include/asm 2014-05-18 19:01:29 -07:00
xor.h