David S. Miller 405849610f [MATH-EMU]: Fix underflow exception reporting. ... The underflow exception cases were wrong. This is one weird area of ieee1754 handling in that the underflow behavior changes based upon whether underflow is enabled in the trap enable mask of the FPU control register. As a specific case the Sparc V9 manual gives us the following description: -------------------- If UFM = 0: Underflow occurs if a nonzero result is tiny and a loss of accuracy occurs. Tininess may be detected before or after rounding. Loss of accuracy may be either a denormalization loss or an inexact result. If UFM = 1: Underflow occurs if a nonzero result is tiny. Tininess may be detected before or after rounding. -------------------- What this amounts to in the packing case is if we go subnormal, we set underflow if any of the following are true: 1) rounding sets inexact 2) we ended up rounding back up to normal (this is the case where we set the exponent to 1 and set the fraction to zero), this should set inexact too 3) underflow is set in FPU control register trap-enable mask The initially discovered example was "DBL_MIN / 16.0" which incorrectly generated an underflow. It should not, unless underflow is set in the trap-enable mask of the FPU csr. Another example, "0x0.0000000000001p-1022 / 16.0", should signal both inexact and underflow. The cpu implementations and ieee1754 literature is very clear about this. This is case #2 above. However, if underflow is set in the trap enable mask, only underflow should be set and reported as a trap. That is handled properly by the prioritization logic in arch/sparc{,64}/math-emu/math.c:record_exception(). Based upon a report and test case from Jakub Jelinek. Signed-off-by: David S. Miller <davem@davemloft.net>		2007-08-16 22:59:49 -07:00
..
Kbuild	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
a.out.h	arch: personality independent stack top	2007-07-19 10:04:45 -07:00
agp.h	…
apb.h	…
asi.h	…
atomic.h	atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency	2007-05-08 11:15:20 -07:00
auxio.h	…
auxvec.h	…
bbc.h	…
bitops.h	…
bpp.h	…
bsderrno.h	…
bug.h	…
bugs.h	[SPARC64]: More sensible udelay implementation.	2007-07-16 04:05:02 -07:00
byteorder.h	…
cache.h	…
cacheflush.h	[PATCH] Optimize D-cache alias handling on fork	2006-12-13 09:27:08 -08:00
chafsr.h	…
checksum.h	[NET]: SPARC64 checksum annotations and cleanups.	2006-12-02 21:23:23 -08:00
chmctrl.h	…
cmt.h	…
compat.h	Introduce compat_u64 and compat_s64 types	2007-07-16 09:05:48 -07:00
compat_signal.h	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
cpudata.h	[SPARC64]: More sensible udelay implementation.	2007-07-16 04:05:02 -07:00
cputime.h	…
current.h	…
dcr.h	…
dcu.h	…
delay.h	[SPARC64]: More sensible udelay implementation.	2007-07-16 04:05:02 -07:00
device.h	[SPARC64]: Probe PCI bus using OF device tree.	2007-04-26 01:55:06 -07:00
display7seg.h	…
div64.h	…
dma-mapping.h	[SPARC64]: Add missing dma_sync_single_range_for_*().	2007-08-03 14:08:20 -07:00
dma.h	[SPARC64]: Fix floppy build failure.	2007-03-05 13:22:28 -08:00
ebus.h	[SPARC64] ebus: Convert to use pci_device_to_OF_node().	2007-04-26 01:55:04 -07:00
elf.h	[SPARC64]: Create a HWCAP_SPARC_N2 and report it to userspace on Niagara-2.	2007-08-16 13:56:39 -07:00
emergency-restart.h	…
envctrl.h	…
errno.h	…
estate.h	…
fb.h	[SPARC]: Implement fb_is_primary_device().	2007-07-20 17:15:09 -07:00
fbio.h	[SPARC]: Mark SBUS framebuffer ioctls as IGNORE in compat_ioctl.c	2007-07-30 00:27:36 -07:00
fcntl.h	[SPARC]: Fix O_CLOEXEC values.	2007-08-03 14:24:17 -07:00
fhc.h	[SPARC64]: Convert central bus layer to in-kernel PROM device tree.	2006-06-23 23:15:32 -07:00
floppy.h	[SPARC64]: asm-sparc64/floppy.h needs linux/pci.h	2007-07-30 00:27:35 -07:00
fpumacro.h	…
futex.h	[PATCH] mm: pagefault_{disable,enable}()	2006-12-07 08:39:21 -08:00
hardirq.h	[SPARC64]: Move over to GENERIC_HARDIRQS.	2006-06-20 01:23:32 -07:00
head.h	…
hvtramp.h	[SPARC64]: Initial LDOM cpu hotplug support.	2007-07-16 04:04:40 -07:00
hw_irq.h	[SPARC64]: Minor irq handling cleanups.	2006-12-17 14:06:56 -08:00
hypervisor.h	[SPARC64]: Initial LDOM cpu hotplug support.	2007-07-16 04:04:40 -07:00
ide.h	…
idprom.h	…
intr_queue.h	…
io.h	[SPARC]: Mark sparc and sparc64 as not having virt_to_bus	2007-07-18 01:20:22 -07:00
ioctl.h	…
ioctls.h	…
iommu.h	[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.	2007-07-30 00:27:34 -07:00
ipc.h	…
ipcbuf.h	…
irq.h	[SPARC64]: dr-cpu unconfigure support.	2007-07-16 04:05:32 -07:00
irq_regs.h	[PATCH] sparc64 pt_regs fixes	2006-10-08 12:32:35 -07:00
irqflags.h	[SPARC64]: Add irqtrace/stacktrace/lockdep support.	2006-12-10 02:39:09 -08:00
isa.h	[SPARC64] isa: Convert to use pci_device_to_OF_node().	2007-04-26 01:55:05 -07:00
kdebug.h	[SPARC64]: Kill unused DIE_PAGE_FAULT enum value.	2007-05-29 02:49:14 -07:00
kmap_types.h	…
kprobes.h	jprobes: remove JPROBE_ENTRY()	2007-07-19 10:04:44 -07:00
ldc.h	[SPARC64]: Fix build regressions added by dr-cpu changes.	2007-07-16 04:04:49 -07:00
linkage.h	…
local.h	local_t: sparc64 cleanup	2007-05-08 11:15:20 -07:00
lsu.h	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
mc146818rtc.h	…
mdesc.h	[SPARC64]: Add basic infrastructure for MD add/remove notification.	2007-07-18 01:19:51 -07:00
mman.h	[PATCH] IA64,sparc: local DoS with corrupted ELFs	2006-09-08 08:40:46 -07:00
mmu.h	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
mmu_context.h	[SPARC64]: dr-cpu unconfigure support.	2007-07-16 04:05:32 -07:00
module.h	…
mostek.h	[SPARC]: sparc64 gcc-4.2.0 20070317 -Werror failure	2007-03-27 01:13:55 -07:00
msgbuf.h	…
mutex.h	…
namei.h	…
ns87303.h	…
numnodes.h	…
of_device.h	Create linux/of_platorm.h	2007-07-20 14:25:22 +10:00
of_platform.h	Create linux/of_platorm.h	2007-07-20 14:25:22 +10:00
openprom.h	[SPARC64]: Bump PROMINTR_MAX to 32.	2007-05-10 00:55:59 -07:00
openpromio.h	…
oplib.h	[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.	2007-08-08 17:33:45 -07:00
page.h	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
param.h	…
parport.h	[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.	2007-07-30 00:27:34 -07:00
pci.h	[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.	2007-07-30 00:27:34 -07:00
pconf.h	…
percpu.h	define new percpu interface for shared data	2007-07-19 10:04:44 -07:00
perfctr.h	…
pgalloc.h	Quicklist support for sparc64	2007-05-07 12:12:54 -07:00
pgtable.h	page table handling cleanup	2007-07-16 09:05:36 -07:00
pil.h	[SPARC64]: Send all device interrupts via one PIL.	2006-06-20 01:20:00 -07:00
poll.h	Consolidate asm/poll.h	2007-05-11 08:29:34 -07:00
posix_types.h	…
processor.h	…
prom.h	[SPARC]: Centralize find_in_proplist() instead of duplicating N times.	2007-08-07 18:46:36 -07:00
psrcompat.h	…
pstate.h	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
ptrace.h	…
reg.h	…
resource.h	…
rtc.h	…
rwsem-const.h	…
rwsem.h	[SPARC64]: Add irqtrace/stacktrace/lockdep support.	2006-12-10 02:39:09 -08:00
sbus.h	[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.	2007-07-30 00:27:34 -07:00
scatterlist.h	PCI: scatterlist.h needs types.h	2007-05-02 19:02:34 -07:00
scratchpad.h	…
seccomp.h	…
sections.h	…
semaphore.h	…
sembuf.h	…
setup.h	[SPARC64]: Increase command line size to 2048 like other arches.	2007-02-12 15:15:47 -08:00
sfafsr.h	consolidate asm/const.h to linux/const.h	2007-05-08 11:15:13 -07:00
sfp-machine.h	[MATH-EMU]: Fix underflow exception reporting.	2007-08-16 22:59:49 -07:00
shmbuf.h	…
shmparam.h	Fix exported headers for SPARC, SPARC64	2006-09-21 08:48:27 +01:00
sigcontext.h	…
siginfo.h	…
signal.h	[SPARC64]: Do not include compat.h from asm-sparc64/signal.h any more.	2006-10-02 14:30:45 -07:00
smp.h	[SPARC64]: dr-cpu unconfigure support.	2007-07-16 04:05:32 -07:00
socket.h	[NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support	2007-04-25 22:24:21 -07:00
sockios.h	[NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution	2007-04-25 22:24:04 -07:00
solerrno.h	…
sparsemem.h	[SPARC64]: MAX_PHYSADDR_BITS et al. really need to be 42 bits not 41.	2007-04-26 01:55:24 -07:00
spinlock.h	[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks	2006-10-01 00:39:21 -07:00
spinlock_types.h	…
spitfire.h	[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.	2007-08-08 17:33:45 -07:00
sstate.h	[SPARC64]: Report proper system soft state to the hypervisor.	2007-05-29 02:49:29 -07:00
starfire.h	[SPARC64]: Kill starfire_cookie from SBUS/PCI.	2006-06-29 16:37:08 -07:00
stat.h	…
statfs.h	…
string.h	…
sunbpp.h	…
svr4.h	…
system.h	[SPARC]: Fix serial console device detection.	2007-07-20 16:59:26 -07:00
termbits.h	[PATCH] tty: preparatory structures for termios revamp	2006-12-08 08:28:56 -08:00
termios.h	[PATCH] consolidate line discipline number definitions	2007-02-11 10:51:26 -08:00
thread_info.h	[SPARC64]: Eliminate NR_CPUS limitations.	2007-05-29 02:49:49 -07:00
timer.h	[SPARC64]: Add clocksource/clockevents support.	2007-04-26 01:54:15 -07:00
timex.h	…
tlb.h	[SPARC64]: Add linux/pagemap.h to asm/tlb.h	2007-06-28 21:25:31 -07:00
tlbflush.h	…
topology.h	[SPARC64]: Fix {mc,smt}_capable().	2007-06-04 21:50:05 -07:00
tsb.h	[SPARC64]: Fix two bugs wrt. kernel 4MB TSB.	2007-05-29 02:51:38 -07:00
ttable.h	[SPARC64]: Unify timer interrupt handler.	2007-04-26 01:54:11 -07:00
types.h	…
uaccess.h	…
uctx.h	…
unaligned.h	…
unistd.h	[SPARC]: Add sys_fallocate() entries.	2007-07-19 21:26:47 -07:00
upa.h	…
user.h	…
utrap.h	…
vga.h	[PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use	2006-06-22 15:05:58 -07:00
vio.h	[SPARC64]: Fix handling of multiple vdc-port nodes.	2007-07-19 21:27:18 -07:00
visasm.h	…
watchdog.h	…
xor.h	[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.	2007-08-08 17:33:45 -07:00