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elfconstants: Update the set of known ELF header (EF_*) flags.

elfconstants: Group EF_* values and masks by machine architecture.

This change is intended to ease the implementation of an ELFTC(3) API that
returns the architecture-specific symbolic name for an e_flags value.

readelf: Add LoongArch support.

Ticket:         #623
Submitted by:   Haowu Ge

readelf: Replace custom code with the use of an -lelftc API.

Using ELFTC(3) APIs here reduces maintenance overheads when a new
EM_* constant needs to be supported.

This change alters the output of "readelf -h" for a few ELF machine
types.  This should hopefully not be an issue in practice, since the
output of readelf(1) is primarily meant for human consumption.

elfconstants: Mark reserved ranges among EM_* values.

Allow elfcopy to create LoongArch PE objects.

Ticket:         #623
Submitted by:   Haowu Ge

Have 'make clean' delete lexer output.

libelftc/testsuite: Check for the BFD target added in [r4183].

libelftc: Add a BFD descriptor for target "efi-app-loongarch64".

Ticket:         #623
Submitted by:   Haowu Ge

libelftc: Keep a list of BFD target descriptors sorted by name.

While here, neaten whitespace use.

libelftc/testsuite: Start a test suite for the elftc_bfd_target*() APIs.

libelftc: Document BFD target names for LoongArch.

Ticket:         #623
Submitted by:   Haowu Ge

libelftc: Add LoongArch-specific BFD descriptors.

Ticket:         #623
Submitted by:   Haowu Ge

libelftc: Add comments.

libelftc: Document ETF_PE and ETF_EFI for completeness.

While here, keep a list sorted and improve the consistency of the text.

libelf/testsuite: Address -Wempty-body, -Wpointer-sign & -Wunused-parameter
warnings.

libelf/testsuite: Address -Wmaybe-uninitialized and -Wunused warnings.

libelf/testsuite: Address -Wmaybe-uninitialized and -Wunused warnings.

libelftc/testsuite: Catch up with [r4172].

elfconstants: Use psABI spellings for a few EM_AARCH64 relocation types.

libelftc/testsuite: Add tests for 32-bit EM_AARCH64 relocation types.

While here, visually separate logical groups of test values.

elfconstants: Add 32-bit relocation types for EM_AARCH64.

libelf/testsuite: Add explanatory comments.

elfconstants: (minor cleanups) Add comments, keep a list sorted.

libelftc: Implement elftc_reloc_type_str() using elftc_get_relocation_type_name().

This change reduces code duplication, and allows the
elftc_reloc_type_str() API to support all of the ELF
machine architectures and relocation types defined in
"common/sys/elfconstants.m4".

c++filt/testsuite: Fix the path to the c++filt binary being tested.

libelftc: Allow elftc_get_relocation_type_name() to translate
relocation type values for all SPARC architectures.

libelftc/testsuite: Add tests for elftc_get_relocation_type_name(), for
known EM_MIPS relocation types.

elfconstants: Update the set of EM_MIPS relocations.

The official processor-specific ABI definition for this architecture
is of 1996 vintage, and the opensource toolchains that support the
architecture have been defining their own extensions to its psABI.
Keep track of the provenance of each relocation type, to help with
future updates to this set.

elfdefinitions: Handle symbol descriptions containing commas correctly.