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517ffce4e1
linux/arch/sparc/include/asm
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David S. Miller 517ffce4e1 sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.

These values are 64-bit.  But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.

Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:

1) Load the top-32bits of a choosen integer register with a sentinel,
   say "-1".  This will be in the outer-most register window.

   The idea is that we're trying to see if the outer-most register
   window gets spilled, and thus the 64-bit values were truncated.

2) Load all the inputs for the montmul/montsqr/mpmul instruction,
   down to the inner-most register window.

3) Execute the opcode.

4) Traverse back up to the outer-most register window.

5) Check the sentinel, if it's still "-1" store the results.
   Otherwise retry the entire sequence.

This retry is extremely troublesome.  If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.

We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.

Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack.  Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.

So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.

Runtime detection of such a facility is tricky, and cumbersome at
best.  For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp).  Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.

With help from Andy Polyakov.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-26 15:18:37 -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 Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
atomic_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
atomic.h
auxio_32.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
auxio_64.h
auxio.h
backoff.h sparc64: Make lock backoff really a NOP on UP builds. 2010-08-18 22:53:26 -07:00
barrier_32.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
barrier_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
barrier.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
bbc.h
bitext.h
bitops_32.h bitops: remove minix bitops from asm/bitops.h 2011-03-23 19:46:22 -07:00
bitops_64.h sparc: Use popc when possible for ffs/__ffs/ffz. 2011-08-02 21:28:53 -07:00
bitops.h
btext.h sparc64: Faster early-boot framebuffer console. 2009-11-27 17:33:43 -08:00
bug.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
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 sparc32: Move cache and TLB flushes over to method ops. 2012-05-13 20:49:31 -07:00
cacheflush_64.h sparc32: use flushi when run-time patching in per_cpu_patch 2012-05-20 13:33:36 -07:00
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
checksum_64.h
checksum.h
chmctrl.h
clock.h
cmpxchg_32.h sparc32: remove runtime btfix support 2012-05-14 14:05:09 -07:00
cmpxchg_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
cmpxchg.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
compat_signal.h
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 sparc32: generic clockevent support 2012-04-15 10:28:50 -07:00
cpudata_64.h sparc64: Use a seperate counter for timer interrupts and NMI checks, like x86. 2010-04-12 22:37:07 -07:00
cpudata.h
cputime.h
current.h
dcr.h
dcu.h
delay_32.h
delay_64.h
delay.h
device.h of: remove asm/of_device.h 2010-07-24 09:57:52 -06:00
dma-mapping.h sparc32,leon: always support leon in ioport 2012-05-27 23:52:53 -07:00
dma.h sparc32: Convert mmu_* interfaces from btfixup to method ops. 2012-05-13 13:57:05 -07:00
ebus_dma.h sparc: Move EBUS DMA interfaces into seperate header file. 2008-08-29 23:10:21 -07:00
ecc.h
eeprom.h
elf_32.h cross-arch: don't corrupt personality flags upon exec() 2012-10-06 03:04:47 +09:00
elf_64.h sparc64: Add detection for features new in SPARC-T4. 2012-08-18 23:02:36 -07:00
elf.h
emergency-restart.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: Kill mmu_{un,}lockarea(). 2012-05-13 13:23:16 -07:00
floppy_64.h sparc64: Remove pointless assignment in floppy support. 2012-05-14 20:59:25 -07:00
floppy.h
fpumacro.h
ftrace.h sparc64: Add proper dynamic ftrace support. 2009-06-16 04:56:53 -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 sparc32: convert to asm-generic/hardirq.h 2009-10-01 13:45:13 -07:00
hardirq_64.h
hardirq.h
head_32.h sparc32: Kill unused defines from asm/head_32.h 2012-05-11 21:43:11 -07:00
head_64.h
head.h
highmem.h sparc32: move kmap_init() to highmem.c 2012-07-26 16:46:17 -07:00
hugetlb.h sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
hvtramp.h
hw_irq.h
hypervisor.h sparc64: Add hypervisor interfaces for SPARC-T4 perf counter access. 2012-08-18 23:03:53 -07:00
ide.h
idprom.h
intr_queue.h
io_32.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
io_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
io-unit.h sparc32: Kill iounit_map_dma_*(). 2008-08-29 02:15:23 -07:00
io.h sparc: add {read,write}*_be routines 2011-05-12 13:44:29 -07:00
ioctls.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
iommu_32.h sparc: Remove generic SBUS probing layer. 2008-08-29 02:15:21 -07:00
iommu_64.h sparc64: Get rid of pci_controller_info. 2008-09-10 23:07:41 -07:00
iommu.h
irq_32.h sparc32: genirq support 2011-04-19 22:11:40 -07:00
irq_64.h nmi watchdog: do not use cpp symbol in Kconfig 2012-03-23 16:58:31 -07:00
irq.h
irqflags_32.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
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 static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
Kbuild Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux 2012-10-14 13:39:34 -07:00
kdebug_32.h sparc32: kernel/trace/trace.c wants DIE_OOPS 2008-11-01 21:44:01 -07:00
kdebug_64.h sparc64: Implement NMI watchdog on capable cpus. 2009-01-30 00:03:53 -08:00
kdebug.h
kgdb.h
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h
ldc.h
leon_amba.h sparc32,leon: always include leon_kernel in build 2012-05-27 23:52:46 -07:00
leon_pci.h PCI: Make the struct pci_dev * argument of pci_fixup_irqs const. 2011-07-22 08:26:06 -07:00
leon.h sparc32,leon: drop leon_init() 2012-07-26 16:46:16 -07:00
linkage.h
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
mdesc.h sparc64: Probe cpu page size support more portably. 2012-09-06 19:01:25 -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 sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
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 sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
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
mutex.h
mxcc.h
nmi.h sparc64: Initial hw perf counter support. 2009-09-10 06:28:20 -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: fix format string argument for prom_printf() 2012-10-02 23:20:34 -04:00
oplib_64.h sparc: fix format string argument for prom_printf() 2012-10-02 23:20:34 -04:00
oplib.h
page_32.h sparc32: drop sparc_unmapped_base 2012-07-26 16:46:16 -07:00
page_64.h sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
page.h
parport.h dt/sparc: Eliminate users of of_platform_{,un}register_driver 2011-02-28 01:36:39 -07:00
pbm.h
pci_32.h PCI: collapse pcibios_resource_to_bus 2012-02-23 20:19:04 -07:00
pci_64.h PCI: collapse pcibios_resource_to_bus 2012-02-23 20:19:04 -07:00
pci.h pci-dma: add linux/pci-dma.h to linux/pci.h 2010-03-12 15:52:42 -08:00
pcic.h sparc32: added CONFIG_PCIC_PCI Kconfig setting 2011-06-02 14:32:37 -07:00
pcr.h sparc64: Add PCR ops for SPARC-T4. 2012-08-18 23:26:19 -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: drop quicklist 2012-07-26 16:46:16 -07:00
pgalloc_64.h sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
pgalloc.h
pgtable_32.h sparc32: drop unused BAD_PAGE stuff 2012-07-26 16:46:16 -07:00
pgtable_64.h sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
pgtable.h
pgtsrmmu.h sparc32: srmmu_probe now knows about leon too 2012-05-27 23:52:51 -07:00
pil.h sparc64: Reschedule KGDB capture to a software interrupt. 2009-03-18 23:51:57 -07:00
processor_32.h Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-23 10:59:07 -07:00
processor_64.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 2012-05-24 15:10:28 -07:00
processor.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
prom.h irq_domain: Centralize definition of irq_dispose_mapping() 2012-02-26 16:48:06 -07:00
psr.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
ptrace.h sparc64: Add global PMU register dumping via sysrq. 2012-10-16 09:34:01 -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
scatterlist.h remove needless ISA_DMA_THRESHOLD 2010-08-07 18:15:50 +02:00
scratchpad.h
seccomp.h x86-64: seccomp: fix 32/64 syscall hole 2009-03-02 15:41:30 -08:00
sections.h sparc32: add support for run-time patching of leon/sun single instructions 2012-05-27 23:52:43 -07:00
serial.h serial: allow 8250 to be used on sparc 2008-10-13 09:51:40 -07:00
setup.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
sfafsr.h
sfp-machine_32.h
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 UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
smp_32.h sparc32: Kill unused hard_smp{4m,4d,leon}_processor_id() inlined. 2012-05-14 14:23:57 -07:00
smp_64.h sparc64: Add global PMU register dumping via sysrq. 2012-10-16 09:34:01 -07:00
smp.h
sparsemem.h
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: Future proof Niagara cpu detection. 2011-09-16 14:21:33 -07:00
stacktrace.h
starfire.h sparc64: Delete starfire_cpu_setup(). 2008-08-31 01:40:12 -07:00
string_32.h sparc32: Remove inline strncmp "optimization" for constant counts. 2012-05-11 19:53:29 -07:00
string_64.h sparc: Stop trying to be so fancy and use __builtin_{memcpy,memset}() 2009-12-10 23:32:10 -08:00
string.h
sunbpp.h
swift.h
switch_to_32.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
switch_to_64.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
switch_to.h Disintegrate asm/system.h for Sparc 2012-03-28 18:30:03 +01:00
syscall.h tracing: Unify arch_syscall_addr() implementations 2010-02-17 13:07:21 +01:00
syscalls.h
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 sanitize tsk_is_polling() 2012-10-01 09:58:13 -04:00
thread_info_64.h sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
thread_info.h
timer_32.h sparc32: remove runtime btfix support 2012-05-14 14:05:09 -07:00
timer_64.h sparc64: Use unsigned long long for u64. 2009-01-06 13:19:28 -08:00
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: mmu_gather rework 2011-05-25 08:39:13 -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 sparc: mmu_gather rework 2011-05-25 08:39:13 -07:00
tlbflush.h
topology_32.h
topology_64.h sched/numa: Rewrite the CONFIG_NUMA sched domain support 2012-05-09 15:00:55 +02:00
topology.h
trap_block.h sparc64: Store per-cpu offset in trap_block[] 2009-06-16 04:56:11 -07:00
traps.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
tsb.h sparc64: Support transparent huge pages. 2012-10-09 16:23:06 +09:00
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 sparc: use the new generic strnlen_user() function 2012-05-26 11:33:54 -07:00
uaccess_64.h sparc64: Fix deficiencies in sun4v error reporting. 2012-10-10 17:19:32 -07:00
uaccess.h sparc: Fix user_addr_max() definition. 2012-05-24 13:41:58 -07:00
unaligned.h
unistd.h UAPI: (Scripted) Disintegrate arch/sparc/include/asm 2012-10-09 09:47:43 +01:00
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 powerpc+sparc/vio: Modernize driver registration 2012-03-28 11:33:24 +11:00
visasm.h sparc64: Fix sparse warnings in visemul.c 2008-09-11 23:46:40 -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 sparc64: Future proof Niagara cpu detection. 2011-09-16 14:21:33 -07:00
xor.h