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25c8a78b1e
linux/include/asm-powerpc
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David Gibson 25c8a78b1e [PATCH] powerpc: Fix handling of fpscr on 64-bit 
The recent merge of fpu.S broken the handling of fpscr for
ARCH=powerpc and CONFIG_PPC64=y.  FP registers could be corrupted,
leading to strange random application crashes.

The confusion arises, because the thread_struct has (and requires) a
64-bit area to save the fpscr, because we use load/store double
instructions to get it in to/out of the FPU.  However, only the low
32-bits are actually used, so we want to treat it as a 32-bit quantity
when manipulating its bits to avoid extra load/stores on 32-bit.  This
patch replaces the current definition with a structure of two 32-bit
quantities (pad and val), to clarify things as much as is possible.
The 'val' field is used when manipulating bits, the structure itself
is used when obtaining the address for loading/unloading the value
from the FPU.

While we're at it, consolidate the 4 (!) almost identical versions of
cvt_fd() and cvt_df() (arch/ppc/kernel/misc.S,
arch/ppc64/kernel/misc.S, arch/powerpc/kernel/misc_32.S,
arch/powerpc/kernel/misc_64.S) into a single version in fpu.S.  The
new version takes a pointer to thread_struct and applies the correct
offset itself, rather than a pointer to the fpscr field itself, again
to avoid confusion as to which is the correct field to use.

Finally, this patch makes ARCH=ppc64 also use the consolidated fpu.S
code, which it previously did not.

Built for G5 (ARCH=ppc64 and ARCH=powerpc), 32-bit powermac (ARCH=ppc
and ARCH=powerpc) and Walnut (ARCH=ppc, CONFIG_MATH_EMULATION=y).
Booted on G5 (ARCH=powerpc) and things which previously fell over no
longer do.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-10-27 20:48:50 +10:00
..
8253pit.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
a.out.h [PATCH] powerpc: Merge include/asm-ppc*/a.out.h into include/asm-powerpc 2005-09-21 19:21:08 +10:00
agp.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
atomic.h [PATCH] powerpc: merge atomic.h, memory.h 2005-09-25 22:38:46 +10:00
auxvec.h [PATCH] powerpc: Fix compiling of ppc32 2005-09-22 21:03:34 +10:00
backlight.h powerpc: Merged asm/backlight.h 2005-10-11 09:59:38 +10:00
bug.h [PATCH] powerpc: Merge bug.h 2005-09-21 19:21:09 +10:00
bugs.h [PATCH] powerpc: Make check_bugs() static inline 2005-09-09 22:11:35 +10:00
byteorder.h [PATCH] powerpc: merge byteorder.h 2005-09-28 15:42:53 +10:00
checksum.h [PATCH] powerpc: merge include/asm-ppc*/checksum.h into include/asm-powerpc/checksum.h 2005-10-26 15:54:31 +10:00
cputable.h Merge changes from linux-2.6 by hand 2005-10-22 16:51:34 +10:00
cputime.h [PATCH] Move the identical files from include/asm-ppc{,64} 2005-08-30 13:32:05 +10:00
dbdma.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
div64.h [PATCH] Move the identical files from include/asm-ppc{,64} 2005-08-30 13:32:05 +10:00
dma.h [PATCH] powerpc: Merge asm-ppc*/dma.h 2005-09-22 21:03:33 +10:00
elf.h powerpc: make process.c suitable for both 32-bit and 64-bit 2005-10-10 22:29:05 +10:00
emergency-restart.h [PATCH] Move the identical files from include/asm-ppc{,64} 2005-08-30 13:32:05 +10:00
errno.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
fcntl.h [PATCH] Consolidate the asm-ppc*/fcntl.h files into asm-powerpc 2005-09-07 16:57:39 -07:00
firmware.h [PATCH] powerpc: Move firmware.h into include/asm-powerpc 2005-10-26 16:00:26 +10:00
grackle.h powerpc: Pull out MPC106 (grackle) initialization code into its own file 2005-10-26 17:16:38 +10:00
hardirq.h powerpc: Get 64-bit configs to compile with ARCH=powerpc 2005-10-10 22:50:37 +10:00
heathrow.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
hw_irq.h powerpc: Get 64-bit configs to compile with ARCH=powerpc 2005-10-10 22:50:37 +10:00
i8259.h powerpc: Merge i8259.c into arch/powerpc/sysdev 2005-10-26 16:47:42 +10:00
ioctl.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
ioctls.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
iommu.h powerpc: move iSeries/iSeries_pci.h to platforms/iseries 2005-10-14 14:51:42 +10:00
ipc.h [PATCH] Move the identical files from include/asm-ppc{,64} 2005-08-30 13:32:05 +10:00
irq.h powerpc: Fix interrupt-tree parsing 2005-10-26 17:19:06 +10:00
kdebug.h powerpc: clean up after powermac build merge 2005-09-27 13:51:59 +10:00
keylargo.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
kmap_types.h [PATCH] powerpc: Merge kmap_types.h 2005-09-19 09:38:49 +10:00
kprobes.h powerpc: clean up after powermac build merge 2005-09-27 13:51:59 +10:00
linkage.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
lmb.h powerpc: Merge in the ppc64 version of the prom code. 2005-10-06 12:06:20 +10:00
local.h [PATCH] Move all the very similar files to asm-powerpc 2005-08-30 13:32:06 +10:00
machdep.h power: Update the multiple inclusion protection symbol on machdep.h 2005-10-26 21:53:19 +10:00
macio.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
mc146818rtc.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
mediabay.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
mman.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
module.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
mpic.h powerpc: Move smp_mpic_message_pass into mpic.c 2005-10-20 17:09:51 +10:00
msgbuf.h [PATCH] powerpc: Merge a few more include files 2005-09-09 22:11:35 +10:00
namei.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
of_device.h powerpc: Merge of_device.c and of_device.h 2005-10-06 13:22:17 +10:00
ohare.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
oprofile_impl.h [PATCH] powerpc: merge oprofile headers 2005-09-21 19:21:08 +10:00
param.h [PATCH] powerpc: Merge a few more include files 2005-09-09 22:11:35 +10:00
percpu.h [PATCH] Move all the very similar files to asm-powerpc 2005-08-30 13:32:06 +10:00
pmac_feature.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
pmac_low_i2c.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
pmc.h [PATCH] powerpc: Merge ppc64 pmc.[ch] with ppc32 perfmon.[ch] 2005-10-20 16:22:24 +10:00
poll.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
posix_types.h [PATCH] powerpc: Merge asm-ppc*/posix_types.h 2005-09-21 19:21:07 +10:00
ppc_asm.h [PATCH] powerpc: Remove trailing \n" in HMT macros 2005-10-26 16:00:19 +10:00
ppc-pci.h powerpc: Move iSeries_pci.c to powerpc/platform/iseries 2005-09-28 02:50:25 +10:00
processor.h [PATCH] powerpc: Fix handling of fpscr on 64-bit 2005-10-27 20:48:50 +10:00
prom.h powerpc: undeprecate the old OF device tree accessors for now 2005-10-27 16:45:29 +10:00
pSeries_reconfig.h powerpc: Merge in the ppc64 version of the prom code. 2005-10-06 12:06:20 +10:00
reg.h [PATCH] powerpc: Remove duplicate definition of set_tb() 2005-10-26 16:00:09 +10:00
resource.h [PATCH] Move all the very similar files to asm-powerpc 2005-08-30 13:32:06 +10:00
rtas.h powerpc: Merge machdep.h 2005-10-19 23:11:21 +10:00
rtc.h powerpc: Make set_rtc_time() return error code from lower-level function 2005-10-22 15:57:55 +10:00
rwsem.h [PATCH] powerpc: Merge asm-ppc*/rwsem.h 2005-09-25 22:38:46 +10:00
scatterlist.h [PATCH] powerpc: merge scatterlist.h 2005-10-27 16:45:52 +10:00
seccomp.h [PATCH] powerpc: Merge asm-ppc*/seccomp.h, drop TIF_32BIT check 2005-09-25 22:38:45 +10:00
sections.h [PATCH] powerpc: Merge simplified sections.h into asm-powerpc 2005-09-19 09:38:50 +10:00
semaphore.h [PATCH] powerpc: merge semaphore.h 2005-09-25 22:38:46 +10:00
sembuf.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
setup.h [PATCH] powerpc: Merge a few more include files 2005-09-09 22:11:35 +10:00
shmbuf.h [PATCH] powerpc: Fix __power64__ typos that should be __powerpc64__ 2005-09-09 22:11:35 +10:00
shmparam.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
siginfo.h [PATCH] ppc64: Add definitions for new PTRACE calls 2005-09-12 17:19:12 +10:00
smu.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
socket.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
sockios.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
spinlock_types.h [PATCH] powerpc: merge include/asm-ppc*/spinlock_types.h into include/asm-powerpc/spinlock_types.h 2005-09-21 19:21:09 +10:00
statfs.h [PATCH] powerpc: merge include/asm-ppc*/statfs.h into include/asm-powerpc/statfs.h 2005-09-21 19:21:10 +10:00
string.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
synch.h [PATCH] powerpc: merge atomic.h, memory.h 2005-09-25 22:38:46 +10:00
system.h [PATCH] powerpc: Fix handling of fpscr on 64-bit 2005-10-27 20:48:50 +10:00
termbits.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
termios.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
thread_info.h [PATCH] powerpc: Merge thread_info.h 2005-10-21 22:47:23 +10:00
time.h powerpc: Fix time code for 601 processors 2005-10-23 17:14:56 +10:00
timex.h [PATCH] ppc32: Fix timekeeping 2005-10-12 08:24:47 -07:00
topology.h [PATCH] powerpc: Merge a few more include files 2005-09-09 22:11:35 +10:00
types.h [PATCH] ppc64: make dma_addr_t 64 bits 2005-10-27 16:45:50 +10:00
unaligned.h [PATCH] powerpc: Standardize on _ASM_POWERPC header symbol prefix 2005-09-09 22:11:34 +10:00
uninorth.h powerpc: Merge various powermac-related header files. 2005-10-20 20:53:39 +10:00
unistd.h powerpc: Merge asm/unistd.h 2005-10-10 22:56:11 +10:00
user.h [PATCH] powerpc: Merge a few more include files 2005-09-09 22:11:35 +10:00
vga.h [PATCH] powerpc: Merge asm-ppc*/vga.h 2005-09-21 19:21:09 +10:00
vio.h powerpc: Add a shutdown member to vio_driver 2005-10-24 17:40:23 +10:00
xmon.h powerpc: Merged asm/xmon.h 2005-10-11 10:00:00 +10:00
xor.h [PATCH] Move the identical files from include/asm-ppc{,64} 2005-08-30 13:32:05 +10:00