ARM: sha256: Remove unused header file ...

sha256_glue.h is not being unsed in the tree. Remove it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: sha256: Remove unused functions ...

sha256_export and sha256_import are not used in the tree. remove them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: Make locally used functions static ...

Many functions are only used locally but still are globally visible.
Make these function static. Avoids warnings generated with -Wmissing-prototypes

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

kbuild: add .SECONDARY special target ...

Based on the following Linux commits:

 - 54a702f70589 ("kbuild: mark $(targets) as .SECONDARY and remove
   .PRECIOUS markers")

 - 8e9b61b293d9 ("kbuild: move .SECONDARY special target to
   Kbuild.include")

This consolidates those two commits and adjusts commit log for barebox.

GNU Make automatically deletes intermediate files that are updated
in a chain of pattern rules.

Example 1) %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
Example 2) %.o <- %.c <- %.c_shipped

arch/arm/crypto/Makefile marks such targets as .PRECIOUS to prevent Make
from deleting them, but the correct way is to use .SECONDARY.

  .SECONDARY
    Prerequisites of this special target are treated as intermediate
    files but are never automatically deleted.

  .PRECIOUS
    When make is interrupted during execution, it may delete the target
    file it is updating if the file was modified since make started.
    If you mark the file as precious, make will never delete the file
    if interrupted.

Both can avoid deletion of intermediate files, but the difference is
the behavior when Make is interrupted; .SECONDARY deletes the target,
but .PRECIOUS does not.

The use of .PRECIOUS is relatively rare since we do not want to keep
partially constructed (possibly corrupted) targets.

.SECONDARY with no prerequisites causes all targets to be treated as
secondary. This agrees the policy of Kbuild.

scripts/Kbuild.include seems a suitable place to add it because it is
included from almost all sub-makes.

I deleted 'SECONDARY' (no dot) from images/Makefile, which I guess
a typo.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: crypto: fix SHA256 shipped assembler code ...

Binutils 2.29 changed behavior of the adr instruction to always
add the thumb mode switch offset, which breaks usages where the
user is interested in the address of an internal symbol, instead
of a jump address. Binutils 3.31 fixed this by only adding the
offset when interworking is required.

As there are toolchains out there with broken binutils, it's better
to fix the code to work around the issue by not using the named
label.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: crypto: initialize digests earlier ...

We moved the digest init functions to coredevice_initcall level. Do
the same with the ARM specific digests aswell so that they are available
at the same time.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

crypto: add digest_alloc_by_algo() ...

In barebox the function digest_alloc() allocates a digest based on a string.
When a subsystem already uses an integer value to identify a digest it makes no
sense to create a string and pass it to digest_alloc(), where it is parsed
again. This patch adds the possibility to get a digest by an enum.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm/crypto: add generated sha256-core.S to gitignore ...

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: crypto: add sha256 assembly support ...

linux arm sha256 current
$ ls -al build/versatilpb/arch/arm/pbl/zbarebox.bin
 -rw-r--r-- 1 root root 207786 Mar 24 13:23 build/versatilpb/arch/arm/pbl/zbarebox.bin

linux arm v4 asm implementation for sha256
$ ls -al build/versatilpb/arch/arm/pbl/zbarebox.bin
 -rw-r--r-- 1 root root 205007 Mar 24 16:47 build/versatilpb/arch/arm/pbl/zbarebox.bin

we win 2779 bytes and speed cf code

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: crypto: add sha1 assembly support ...

from Linux 3.9

linux generic implementation

$ ls -al build/versatilpb/arch/arm/pbl/zbarebox.bin
-rw-r--r-- 1 root root 210829 Mar 24 13:21 build/versatilpb/arch/arm/pbl/zbarebox.bin

linux arm v4 asm implementation
$ ls -al build/versatilpb/arch/arm/pbl/zbarebox.bin
-rw-r--r-- 1 root root 207786 Mar 24 13:23 build/versatilpb/arch/arm/pbl/zbarebox.bin

we win 3043 bytes and speed cf code

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>