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
arch: personality independent stack top
2007-07-19 10:04:45 -07:00
atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency
2007-05-08 11:15:20 -07:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC64]: More sensible udelay implementation.
2007-07-16 04:05:02 -07:00
[PATCH] Move read_mostly definition to asm/cache.h
2006-03-23 07:38:10 -08:00
[PATCH] Optimize D-cache alias handling on fork
2006-12-13 09:27:08 -08:00
[NET]: SPARC64 checksum annotations and cleanups.
2006-12-02 21:23:23 -08:00
Introduce compat_u64 and compat_s64 types
2007-07-16 09:05:48 -07:00
Remove all inclusions of <linux/config.h>
2006-10-04 03:38:54 -04:00
[SPARC64]: More sensible udelay implementation.
2007-07-16 04:05:02 -07:00
[SPARC64]: More sensible udelay implementation.
2007-07-16 04:05:02 -07:00
[SPARC64]: Probe PCI bus using OF device tree.
2007-04-26 01:55:06 -07:00
[SPARC64]: Add missing dma_sync_single_range_for_*().
2007-08-03 14:08:20 -07:00
[SPARC64]: Fix floppy build failure.
2007-03-05 13:22:28 -08:00
[SPARC64] ebus: Convert to use pci_device_to_OF_node().
2007-04-26 01:55:04 -07:00
[SPARC64]: Create a HWCAP_SPARC_N2 and report it to userspace on Niagara-2.
2007-08-16 13:56:39 -07:00
[SPARC]: Implement fb_is_primary_device().
2007-07-20 17:15:09 -07:00
[SPARC]: Mark SBUS framebuffer ioctls as IGNORE in compat_ioctl.c
2007-07-30 00:27:36 -07:00
[SPARC]: Fix O_CLOEXEC values.
2007-08-03 14:24:17 -07:00
[SPARC64]: Convert central bus layer to in-kernel PROM device tree.
2006-06-23 23:15:32 -07:00
[SPARC64]: asm-sparc64/floppy.h needs linux/pci.h
2007-07-30 00:27:35 -07:00
[PATCH] mm: pagefault_{disable,enable}()
2006-12-07 08:39:21 -08:00
[SPARC64]: Move over to GENERIC_HARDIRQS.
2006-06-20 01:23:32 -07:00
[SPARC64]: Initial LDOM cpu hotplug support.
2007-07-16 04:04:40 -07:00
[SPARC64]: Minor irq handling cleanups.
2006-12-17 14:06:56 -08:00
[SPARC64]: Initial LDOM cpu hotplug support.
2007-07-16 04:04:40 -07:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC]: Mark sparc and sparc64 as not having virt_to_bus
2007-07-18 01:20:22 -07:00
[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.
2007-07-30 00:27:34 -07:00
[SPARC64]: dr-cpu unconfigure support.
2007-07-16 04:05:32 -07:00
[PATCH] sparc64 pt_regs fixes
2006-10-08 12:32:35 -07:00
[SPARC64]: Add irqtrace/stacktrace/lockdep support.
2006-12-10 02:39:09 -08:00
[SPARC64] isa: Convert to use pci_device_to_OF_node().
2007-04-26 01:55:05 -07:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
[SPARC64]: Kill unused DIE_PAGE_FAULT enum value.
2007-05-29 02:49:14 -07:00
jprobes: remove JPROBE_ENTRY()
2007-07-19 10:04:44 -07:00
[SPARC64]: Fix build regressions added by dr-cpu changes.
2007-07-16 04:04:49 -07:00
local_t: sparc64 cleanup
2007-05-08 11:15:20 -07:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC64]: Add basic infrastructure for MD add/remove notification.
2007-07-18 01:19:51 -07:00
[PATCH] IA64,sparc: local DoS with corrupted ELFs
2006-09-08 08:40:46 -07:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
[SPARC64]: dr-cpu unconfigure support.
2007-07-16 04:05:32 -07:00
[SPARC]: sparc64 gcc-4.2.0 20070317 -Werror failure
2007-03-27 01:13:55 -07:00
[SPARC64]: Move over to sparsemem.
2006-03-20 01:14:22 -08:00
Create linux/of_platorm.h
2007-07-20 14:25:22 +10:00
Create linux/of_platorm.h
2007-07-20 14:25:22 +10:00
[SPARC64]: Bump PROMINTR_MAX to 32.
2007-05-10 00:55:59 -07:00
[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.
2007-08-08 17:33:45 -07:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.
2007-07-30 00:27:34 -07:00
[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.
2007-07-30 00:27:34 -07:00
define new percpu interface for shared data
2007-07-19 10:04:44 -07:00
Quicklist support for sparc64
2007-05-07 12:12:54 -07:00
page table handling cleanup
2007-07-16 09:05:36 -07:00
[SPARC64]: Send all device interrupts via one PIL.
2006-06-20 01:20:00 -07:00
Consolidate asm/poll.h
2007-05-11 08:29:34 -07:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC]: Centralize find_in_proplist() instead of duplicating N times.
2007-08-07 18:46:36 -07:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
[SPARC64]: Add irqtrace/stacktrace/lockdep support.
2006-12-10 02:39:09 -08:00
[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.
2007-07-30 00:27:34 -07:00
PCI: scatterlist.h needs types.h
2007-05-02 19:02:34 -07:00
[SPARC64]: Increase command line size to 2048 like other arches.
2007-02-12 15:15:47 -08:00
consolidate asm/const.h to linux/const.h
2007-05-08 11:15:13 -07:00
[MATH-EMU]: Fix underflow exception reporting.
2007-08-16 22:59:49 -07:00
Fix exported headers for SPARC, SPARC64
2006-09-21 08:48:27 +01:00
Don't include linux/config.h from anywhere else in include/
2006-04-26 12:56:16 +01:00
[SPARC64]: Do not include compat.h from asm-sparc64/signal.h any more.
2006-10-02 14:30:45 -07:00
[SPARC64]: dr-cpu unconfigure support.
2007-07-16 04:05:32 -07:00
[NET]: Adding SO_TIMESTAMPNS / SCM_TIMESTAMPNS support
2007-04-25 22:24:21 -07:00
[NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution
2007-04-25 22:24:04 -07:00
[SPARC64]: MAX_PHYSADDR_BITS et al. really need to be 42 bits not 41.
2007-04-26 01:55:24 -07:00
[PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks
2006-10-01 00:39:21 -07:00
[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.
2007-08-08 17:33:45 -07:00
[SPARC64]: Report proper system soft state to the hypervisor.
2007-05-29 02:49:29 -07:00
[SPARC64]: Kill starfire_cookie from SBUS/PCI.
2006-06-29 16:37:08 -07:00
[SPARC]: Fix serial console device detection.
2007-07-20 16:59:26 -07:00
[PATCH] tty: preparatory structures for termios revamp
2006-12-08 08:28:56 -08:00
[PATCH] consolidate line discipline number definitions
2007-02-11 10:51:26 -08:00
[SPARC64]: Eliminate NR_CPUS limitations.
2007-05-29 02:49:49 -07:00
[SPARC64]: Add clocksource/clockevents support.
2007-04-26 01:54:15 -07:00
[SPARC64]: Define ARCH_HAS_READ_CURRENT_TIMER.
2006-03-20 01:13:29 -08:00
[SPARC64]: Add linux/pagemap.h to asm/tlb.h
2007-06-28 21:25:31 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
2006-05-06 19:59:18 +01:00
[SPARC64]: Fix {mc,smt}_capable().
2007-06-04 21:50:05 -07:00
[SPARC64]: Fix two bugs wrt. kernel 4MB TSB.
2007-05-29 02:51:38 -07:00
[SPARC64]: Unify timer interrupt handler.
2007-04-26 01:54:11 -07:00
[SPARC64]: __bzero_noasi --> __clear_user
2006-03-20 01:13:28 -08:00
[SPARC]: Add sys_fallocate() entries.
2007-07-19 21:26:47 -07:00
[PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use
2006-06-22 15:05:58 -07:00
[SPARC64]: Fix handling of multiple vdc-port nodes.
2007-07-19 21:27:18 -07:00
[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.
2007-08-08 17:33:45 -07:00
405849610f