Use a `for` instead of a `while` loop and use meaningful identifiers.
Also, don't use more than one variable for one and the same purpose,
don't use more (non-const) variables than necessary, don't alter more
than one variable per statement, don't compare pointers of different
types and don't do pointer arithmetic on `void *`.
This was meant as a fix up to a regression but that has already been
fixed.
Change-Id: I0c8fd118d127a26cfcf68bfb0bf681495821e80a
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20750
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Fix an issue when setting an unaligned buffer where n is less
than the difference of the rounded up pointer and the pointer.
This was identified where n=1 was passed. n was decremented
once, as expected, then decremented again after the while()
evaluated to false. This resulted in a new n of 4GB.
Change-Id: I862671bbe7efa8d370d0148e22ea55407e260053
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/20655
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
The memcpy(), memmove() and memcmp() functions use word by word
operations regardless of the pointer alignment. Depending on the
platform, this could lead to a crash.
This patch makes the memcpy(), memmove() or memcmp() operate byte per
byte if they are supplied with unaligned pointers.
Change-Id: I0b668739b7b58d47266f10f2dff2dc9cbf38577e
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/20535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Julius Werner <jwerner@chromium.org>
The optimization of the memset() function introduced by commit
dbadb1dd63 (libpayload: Reorder default
memcpy, speed up memset and memcmp) is provoking an issue on x86
platform when compiling without the CONFIG_GPL option.
GCC is making use of the movdqa instruction to copy words. This
instruction can raise a "General Protection Fault Exception" when it
is called on a non-aligned address argument.
Change-Id: I73382a76a4399d8e78244867f2ebb1dca176a6bf
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/20524
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
If I wanted to fill the whole memory address space with one byte, I
wouldn't try it that subtle.
With size_t beeing unsigned the loop condition >= 0 was always true.
Change-Id: Idee6a4901f6697093c88bda354b5e43066c0d948
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/11286
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Used command line to remove empty lines at end of file:
find . -type f -exec sed -i -e :a -e '/^\n*$/{$d;N;};/\n$/ba' {} \;
Change-Id: I816ac9666b6dbb7c7e47843672f0d5cc499766a3
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: http://review.coreboot.org/10446
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
The current default memcpy first copies single bytes to align the
amount, then copies the rest as full words. In practice, the start of a
buffer is much more likely to be word-aligned then the end, and aligned
word access are usually more efficient. This patch reorders those
accesses to first copy as many full words as possible and then finish
the rest with byte accesses to optimize this common case.
This fixes a data abort when using USB on ARM without CONFIG_GPL. Due to
some limitations of how DMA memory is set up in coreboot on ARM, it
currently does not support unaligned accesses. (This could be fixed with
a more complicated patch, but it's usually not an issue... unless, of
course, your memcpy happens to be braindead).
Also add word-aligned accesses to memset and memcmp while I'm at it, and
make memcmp's return value standard's compliant.
BUG=chrome-os-partner:24957
TEST=Manual
Original-Change-Id: I2a7bcb35626a05a9a43fcfd99eb958b485d7622a
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/203547
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
(cherry picked from commit 05a64d2e107e1675cc3442e6dabe14a341e55673)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: I0030ca8a203c97587b0da31a0a5e9e11b0be050f
Reviewed-on: http://review.coreboot.org/8126
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
The default_ functions in memory.c are only used to initialize a weak
variable. They should not be used outside memory.c. Make them
invisible.
Remove the declaration from libpayload.h. For real this time.
Change-Id: Id54c1fd172c78748f01a958ce4065dd0eb53bbc3
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/2394
Tested-by: build bot (Jenkins)
Reviewed-by: Gabe Black <gabeblack@chromium.org>
The implementations for various stdlib functions in libc/memory.c are very
generic and should work under just about any circumstances. They are
unfortunately also very slow. This change makes them weak symbols so that
faster versions can be defined on a per architecture basis which will
automatically take the place of the slow versions.
Change-Id: Ia1ac90d9dcd45962b2a15f61ecc74b0a4676048d
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: http://review.coreboot.org/1725
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)
while others dislike them being extra commits, let's clean them up once and
for all for the existing code. If it's ugly, let it only be ugly once :-)
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5507 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Thanks to Ulf Jordan for figuring this out!
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3527 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
There was a bit of confusion in the memcpy functions - we could simplify
things slightly without having to revert to 8 bit copies on a 32 bit
system.
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3519 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Nico Huber