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5642c89e70
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Alexey Brodkin 5642c89e70 binutils: fix building perf on ARC 
It turned out one of the previous fixes (required to build Linux
kernel)
------------------>8-------------------
ARC Binutils: a65b844aed
Buildroot: http://git.buildroot.net/buildroot/commit/?id=2d4e2e238a0ea9395152ae71d882d79b1f35094c
------------------>8-------------------
broke building of some other software packages.

In particular perf built for ARCv2 had corrupted .plt entries that lead
to immediate crash on perf execution.

That's an example of normal .plt entries:
------------------>8-------------------
< 1-st PLT entry >:
   12c24:    30 27 8c 7f 0d 00 74 95    ld         r12,[pcl,0x000d9574]
   12c2c:    21 20 00 03                j.d        [r12]
   12c30:    0a 24 c0 1f                mov        r12,pcl

< 2-nd PLT entry >:
   12c34:    30 27 8c 7f 0d 00 68 95    ld         r12,[pcl,0x000d9568]
   12c3c:    21 20 00 03                j.d        [r12]
   12c40:    0a 24 c0 1f                mov        r12,pcl
------------------>8-------------------
Note right after jump in its delay-slot r12 gets set with current value
of program counter. This is required for the first symbol resolution,
see implementation of _dl_linux_resolve here:
http://git.uclibc.org/uClibc/tree/ldso/ldso/arc/resolve.S#n46

And that's what we got in .plt after mentioned fixes:
------------------>8-------------------
< 1-st PLT entry>:
   13384:    30 27 8c 7f 0f 00 84 75     ld         r12,[pcl,0x000f7584]
   1338c:    21 20 00 03                 j.d        [r12]

< 2-nd PLT entry>:
   13390:    30 27 8c 7f 0f 00 78 75     ld         r12,[pcl,0x000f7578]
   13398:    21 20 00 03                 j.d        [r12]
------------------>8-------------------

Note r12 setup is missing.

That happened because linker thought the size of PLT entry is 12 bytes
(which is exactly the size of PLT entry for ARCv1, read ARC750/770)
while for ARCv2 PLT entry is 16-bytes long. And erroneously trailing 4
bytes were truncated.

Current commit fixes this misbehavior and PLT gets generated properly
again.

Now we have a fix for that issue, see
5df50c6108

This fix is in arc-2.23-dev branch and will be a part of the next
release of ARC tools, so then this patch must be removed from buildroot.

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2015-10-17 16:16:53 +02:00
arch arch: add support for mips32r6 and mips64r6 variants 2015-10-12 21:33:56 +02:00
board qemu: add new board support for qemu-system-sparc64 2015-10-10 12:52:16 +02:00
boot uboot: arm64 arch build support 2015-10-12 21:59:44 +02:00
configs configs: update cubieboard_defconfig to a 3.4 kernel 2015-10-15 10:46:35 +02:00
docs docs/manual: add section about size graphing 2015-10-17 16:13:09 +02:00
fs fs/axfs: fix URL indentation 2015-10-15 21:59:39 +02:00
linux linux: add 'Image' as the image name for aarch64 2015-10-05 16:01:32 +02:00
package binutils: fix building perf on ARC 2015-10-17 16:16:53 +02:00
support support/scripts: add size-stats script 2015-10-17 16:12:59 +02:00
system system: add options for /bin /sbin and /lib to be symlinks into /usr 2015-10-14 22:50:03 +02:00
toolchain toolchain-external: bypass buildroot wrapper 2015-10-17 10:50:35 +02:00
.defconfig arch: kill avr32 2015-02-14 17:39:50 +01:00
.gitignore update gitignore 2013-05-04 12:41:55 +02:00
CHANGES Update for 2015.08 2015-08-31 23:06:58 +02:00
Config.in ccache: support changing the output directory 2015-10-04 18:22:21 +02:00
Config.in.legacy media-ctl: remove package 2015-10-10 11:40:54 +02:00
COPYING clarify license and fix website license link 2009-05-08 09:29:41 +02:00
Makefile Makefile: implement a graph-size target 2015-10-17 16:13:05 +02:00
Makefile.legacy Makefile.legacy: fix recursive invocation with BUILDROOT_DL_DIR and _CONFIG 2014-02-11 08:14:57 +01:00
README README: mention 'make list-defconfigs' 2015-04-04 15:19:43 +02:00

README 

Buildroot is a simple, efficient and easy-to-use tool to generate embedded
Linux systems through cross-compilation.

The documentation can be found in docs/manual. You can generate a text
document with 'make manual-text' and read output/docs/manual/manual.text.
Online documentation can be found at http://buildroot.org/docs.html

To build and use the buildroot stuff, do the following:

1) run 'make menuconfig'
2) select the target architecture and the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) find the kernel, bootloader, root filesystem, etc. in output/images

You do not need to be root to build or run buildroot.  Have fun!

Buildroot comes with a basic configuration for a number of boards. Run
'make list-defconfigs' to view the list of provided configurations.

Please feed suggestions, bug reports, insults, and bribes back to the
buildroot mailing list: buildroot@buildroot.org
You can also find us on #buildroot on Freenode IRC.