linux/arch
Paul Mackerras ae62fbb5f1 [POWERPC] Fix subtle FP state corruption bug in signal return on SMP
This fixes a bug which can cause corruption of the floating-point state
on return from a signal handler.  If we have a signal handler that has
used the floating-point registers, and it happens to context-switch to
another task while copying the interrupted floating-point state from the
user stack into the thread struct (e.g. because of a page fault, or
because it gets preempted), the context switch code will think that the
FP registers contain valid FP state that needs to be copied into the
thread_struct, and will thus overwrite the values that the signal return
code has put into the thread_struct.

This can occur because we clear the MSR bits that indicate the presence
of valid FP state after copying the state into the thread_struct.  To fix
this we just move the clearing of the MSR bits to before the copy.  A
similar potential problem also occurs with the Altivec state, and this
fixes that in the same way.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-06-26 14:49:11 +10:00
..
alpha alpha: fix alignment problem in csum_ipv6_magic() 2007-06-24 08:59:11 -07:00
arm [ARM] 4445/1: ANUBIS: Fix CPLD registers 2007-06-11 09:09:34 +01:00
arm26 all-archs: consolidate .data section definition in asm-generic 2007-05-19 09:11:57 +02:00
avr32 [AVR32] Update defconfigs 2007-06-23 15:43:48 +02:00
blackfin Blackfin arch: match kernel startup messaage with new linker script 2007-06-21 11:34:16 +08:00
cris Fix trivial typos in Kconfig* files 2007-05-09 07:12:20 +02:00
frv all-archs: consolidate .data section definition in asm-generic 2007-05-19 09:11:57 +02:00
h8300 h8300 trival patches 2007-06-01 08:18:29 -07:00
i386 ACPI: preserve the ebx value in acpi_copy_wakeup_routine 2007-06-24 08:59:12 -07:00
ia64 [IA64] acpi_get_sysname() should be __init 2007-05-24 10:59:44 -07:00
m32r all-archs: consolidate .data section definition in asm-generic 2007-05-19 09:11:57 +02:00
m68k x86_64: Quieten Atari keyboard warnings in Kconfig 2007-06-20 14:27:26 -07:00
m68knommu m68knommu: fix ColdFire timer off by 1 2007-06-08 17:23:32 -07:00
mips [MIPS] Don't drag a platform specific header into generic arch code. 2007-06-20 22:27:10 +01:00
parisc [PARISC] unwinder improvements 2007-06-21 17:46:22 -04:00
powerpc [POWERPC] Fix subtle FP state corruption bug in signal return on SMP 2007-06-26 14:49:11 +10:00
ppc potential parse error in ifdef part 3 2007-06-08 17:23:33 -07:00
s390 [S390] Add oops_enter()/oops_exit() calls to die(). 2007-06-19 13:10:20 +02:00
sh sh: Handle -ERESTART_RESTARTBLOCK for restartable syscalls. 2007-06-19 12:33:21 +09:00
sh64 sh64: Handle -ERESTART_RESTARTBLOCK for restartable syscalls. 2007-06-19 12:41:32 +09:00
sparc [SPARC32]: Build fix. 2007-05-31 01:52:51 -07:00
sparc64 [SPARC64]: Fix args to sun4v_ldc_revoke(). 2007-06-13 00:01:27 -07:00
um uml: remove PAGE_SIZE from libc code 2007-06-16 13:16:16 -07:00
v850 all-archs: consolidate .data section definition in asm-generic 2007-05-19 09:11:57 +02:00
x86_64 x86_64: fix misplaced `continue' in mce.c 2007-06-24 08:59:12 -07:00
xtensa [XTENSA] Remove non-rt signal handling 2007-05-31 17:49:32 -07:00