linux-stable.git/arch/powerpc/kernel/misc_64.S, branch linux-3.16.y

powerpc: Allow flush_icache_range to work across ranges >4GB

2020-02-11T20:03:34+00:00

commit 29430fae82073d39b1b881a3cd507416a56a363f upstream.

When calling flush_icache_range with a size >4GB, we were masking
off the upper 32 bits, so we would incorrectly flush a range smaller
than intended.

This patch replaces the 32 bit shifts with 64 bit ones, so that
the full size is accounted for.

Signed-off-by: Alastair D'Silva 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191104023305.9581-2-alastair@au1.ibm.com
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings

powerpc/64: Fix flush_(d|i)cache_range() called from modules

2017-07-18T17:40:30+00:00

commit 8f5f525d5b83f7d76a6baf9c4e94d4bf312ea7f6 upstream.

When the kernel is compiled to use 64bit ABIv2 the _GLOBAL() macro does
not include a global entry point. A function's global entry point is
used when the function is called from a different TOC context and in the
kernel this typically means a call from a module into the vmlinux (or
vice-versa).

There are a few exported asm functions declared with _GLOBAL() and
calling them from a module will likely crash the kernel since any TOC
relative load will yield garbage.

flush_icache_range() and flush_dcache_range() are both exported to
modules, and use the TOC, so must use _GLOBAL_TOC().

Fixes: 721aeaa9fdf3 ("powerpc: Build little endian ppc64 kernel with ABIv2")
Signed-off-by: Oliver O'Halloran 
Signed-off-by: Michael Ellerman 
Signed-off-by: Ben Hutchings

powerpc/kernel: Use kprobe blacklist for asm functions

2017-07-18T17:40:30+00:00

commit 6f698df10cb24d466b9a790b9daedb9e7bcd5d2a upstream.

Rather than forcing the whole function into the ".kprobes.text" section,
just add the symbol's address to the kprobe blacklist.

This also lets us drop the three versions of the_KPROBE macro, in
exchange for just one version of _ASM_NOKPROBE_SYMBOL - which is a good
cleanup.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings

powerpc: module: handle MODVERSION for .TOC.

2014-04-23T00:05:28+00:00

For the ELFv2 ABI, powerpc introduces a magic symbol ".TOC.".  If we
don't create a CRC for it (minus the leading ".", since we strip that)
we get a modpost warning about missing CRC and the CRC array seems to
be displaced by 1 so other CRCs mismatch too.

Signed-off-by: Rusty Russell

powerpc: EXPORT_SYMBOL(.TOC.)

2014-04-23T00:05:28+00:00

For the ELFv2 ABI, powerpc introduces a magic symbol ".TOC.".  depmod
then complains that this doesn't resolve (so does modpost, but we could
easily fix that).  To export this, we need to use asm.

modpost and depmod both strip "." from symbols for the old PPC64 ELFv1
ABI, so we actually export a "TOC.".

Signed-off-by: Rusty Russell

powerpc: ABIv2 function calls must place target address in r12

2014-04-23T00:05:20+00:00

To establish addressability quickly, ABIv2 requires the target
address of the function being called to be in r12. Fix a number of
places in assembly code that we do indirect function calls.

We need to avoid function descriptors on ABIv2 too.

Signed-off-by: Anton Blanchard

powerpc: No need to use dot symbols when branching to a function

2014-04-23T00:05:16+00:00

binutils is smart enough to know that a branch to a function
descriptor is actually a branch to the functions text address.

Alan tells me that binutils has been doing this for 9 years.

Signed-off-by: Anton Blanchard

Merge branch 'merge' into next

2013-12-30T04:19:31+00:00

Merge a pile of fixes that went into the "merge" branch (3.13-rc's) such
as Anton Little Endian fixes.

Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix build break with PPC_EARLY_DEBUG_BOOTX=y

2013-12-10T00:25:03+00:00

A kernel configured with PPC_EARLY_DEBUG_BOOTX=y but PPC_PMAC=n and
PPC_MAPLE=n will fail to link:

  btext.c:(.text+0x2d0fc): undefined reference to `.rmci_off'
  btext.c:(.text+0x2d214): undefined reference to `.rmci_on'

Fix it by making the build of rmci_on/off() depend on
PPC_EARLY_DEBUG_BOOTX, which also enable the only code that uses them.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

powerpc: purge all the prefetched instructions for the coherent icache flush

2013-12-02T03:13:47+00:00

As Benjamin Herrenschmidt has indicated, we still need a dummy icbi to
purge all the prefetched instructions from the ifetch buffers for the
snooping icache. We also need a sync before the icbi to order the
actual stores to memory that might have modified instructions with
the icbi.

Signed-off-by: Kevin Hao 
Signed-off-by: Benjamin Herrenschmidt