platform_external_elfutils/lib, branch android10-release

libcpu: Recognize bpf jump variants BPF_JLT, BPF_JLE, BPF_JSLT and BPF_JSLE

2018-11-09T17:26:38+00:00

Linux kernel 4.13 introduced 4 more jump class variants.

  commit 92b31a9af73b3a3fc801899335d6c47966351830
  Author: Daniel Borkmann 
  Date:   Thu Aug 10 01:39:55 2017 +0200

    bpf: add BPF_J{LT,LE,SLT,SLE} instructions

For conditional jumping on unsigned and signed < and <= between a register
and another register or immediate.

Add these new constants to bpf.h, recognize them in bpf_disasm and update
the testfile-bpf-dis1.expect file.

Signed-off-by: Mark Wielaard

Consolidate error.h inclusion in system.h

2018-07-05T19:06:40+00:00

error.h isn't standard and so isn't part of the musl C library.
To easy future porting, consolidate the inclusion of error.h into system.h.

https://sourceware.org/bugzilla/show_bug.cgi?id=21008

Signed-off-by: Ross Burton

Prepare for 0.171.

2018-06-01T19:16:56+00:00

Set version to 0.171. Update po/*.po files.
Mention DWARF5, split dwarf and GNU DebugFission support in NEWS.

Signed-off-by: Mark Wielaard

Use fallthrough attribute.

2018-02-10T02:19:26+00:00

Use __attribute__ ((fallthrough)) to indicate switch case fall through
instead of a comment. This ensures that the fallthrough warning is not
triggered even if the file is pre-processed (hence stripping the
comments) before it is compiled.

The actual fallback implementation is hidden behind a FALLBACK macro in
case the compiler doesn't support it.

Finally, the -Wimplict-fallthrough warning was upgraded to only allow
the attribute to satisfy it; a comment alone is no longer sufficient.

Signed-off-by: Joshua Watt

lib: Remove md5 and sha1 implementations.

2017-10-20T11:51:02+00:00

Only the testcase md5-sha1-test used them. So also remove that testcase.

Signed-off-by: Mark Wielaard

Make sure packed structs follow the gcc memory layout

2017-09-20T19:40:31+00:00

gcc defaults to using struct layouts that follow the native conventions,
even if __attribute__((packed)) is given. In order to get the layout we
expect, we need to tell gcc to always use the gcc struct layout, at
least for packed structs. To do this, we can use the gcc_struct
attribute.

This is important, not only for porting to windows, but also potentially
for other platforms, as the bugs resulting from struct layout
differences are rather subtle and hard to find.

Signed-off-by: Ulf Hermann

Check if gcc complains about attribute (visibility(..))

2017-08-18T20:32:44+00:00

If so, define attribute_hidden to be empty. Also, use attribute_hidden
in all places where we hide symbols. If this attribute is missing, it
simply means that we cannot hide private symbols in the binary using
attributes. This disables some optimizations and may increase the risk
of symbol name clashes with other libraries, but is not fatal.

However, we still employ linker version scripts to explicitly define
the exported symbols. This serves much of the same purpose. Also, as
all our symbols are prefixed with the library name, and "__" for
private ones, the chance of clashes is low anyway.

Signed-off-by: Ulf Hermann

Check for -z,defs, -z,relro, -fPIC, -fPIE before using them

2017-08-18T20:29:46+00:00

Those flags are not available on all platforms, and omitting them when
not available will not cause any harm. In particular:

-z,defs disallows undefined symbols in object files. This option is
unsupported if the target binary format enforces the same condition
already. Furthermore it is only a compile time sanity check. When it is
omitted, the same binary is produced.

-z,relro instructs the loader to mark sections read-only after loading
the library, where possible. This is a hardening mechanism. If it is
unavailable, the functionality of the code is not affected in any way.

-fPIC instructs the compiler to produce position independent code. While
this is preferable to relocatable code, relocatable code also works and
may even be faster. Relocatable code might just be loaded into memory
multiple times for different processes.

-fPIE is the same thing as -fPIC for executables rather than shared
libraries.

Signed-off-by: Ulf Hermann

backends: Don't depend on linux/bpf.h to compile bpf disassembler.

2017-07-24T10:06:14+00:00

We only need a few constants and one structure definition from linux/bpf.
Just define those in a local lib/bpf.h file. This makes sure the bpf
disassembler is always build and included even when elfutils is build
on older GNU/Linux systems (and even on other platforms).

Signed-off-by: Mark Wielaard

Prepare for 0.169.

2017-05-05T07:47:35+00:00

Set version to 0.169. Update copyright year. Update po/*.po files.
And add user visible changes to new 0.169 NEWS section.

Signed-off-by: Mark Wielaard