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Christina Schimpe 86bb38cee9 gdb: Make tagged pointer support configurable.
The gdbarch function gdbarch_remove_non_address_bits adjusts addresses to
enable debugging of programs with tagged pointers on Linux, for instance for
ARM's feature top byte ignore (TBI).
Once the function is implemented for an architecture, it adjusts addresses for
memory access, breakpoints and watchpoints.

Linear address masking (LAM) is Intel's (R) implementation of tagged
pointer support.  It requires certain adaptions to GDB's tagged pointer
support due to the following:
- LAM supports address tagging for data accesses only.  Thus, specifying
  breakpoints on tagged addresses is not a valid use case.
- In contrast to the implementation for ARM's TBI, the Linux kernel supports
  tagged pointers for memory access.

This patch makes GDB's tagged pointer support configurable such that it is
possible to enable the address adjustment for a specific feature only (e.g
memory access, breakpoints or watchpoints).  This way, one can make sure
that addresses are only adjusted when necessary.  In case of LAM, this
avoids unnecessary parsing of the /proc/<pid>/status file to get the
untag mask.

Reviewed-By: Felix Willgerodt <felix.willgerodt@intel.com>
(AArch64) Tested-By: Luis Machado <luis.machado@arm.com>
Approved-By: Luis Machado <luis.machado@arm.com>
2024-11-18 13:35:52 +00:00
bfd ELF: SHF_STRINGS isn't really tied to SHF_MERGE 2024-11-18 11:36:57 +01:00
binutils gas/ELF: also reject merge entity size being zero 2024-11-18 11:35:57 +01:00
config
contrib
cpu
elfcpp
etc
gas x86: rename SPACE_{,E}VEX_MAP<N> 2024-11-18 11:46:28 +01:00
gdb gdb: Make tagged pointer support configurable. 2024-11-18 13:35:52 +00:00
gdbserver gdbserver: pass osabi to GDB in more target descriptions 2024-11-12 12:51:36 +00:00
gdbsupport [gdb] Fix some typos 2024-11-18 09:46:31 +01:00
gnulib
gold
gprof
gprofng gprofng: fix -std=gnu23 compatibility wrt unprototyped functions 2024-11-18 05:12:56 +00:00
include aarch64: improve debuggability on array of enum 2024-11-08 11:35:46 +00:00
ld ld: Support percent-encoded JSON in --package-metadata 2024-11-18 11:38:25 +01:00
libbacktrace
libctf
libdecnumber
libiberty
libsframe
opcodes x86: rename SPACE_{,E}VEX_MAP<N> 2024-11-18 11:46:28 +01:00
readline
sim
texinfo
zlib
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.pre-commit-config.yaml [precommit] Add some documentation in .pre-commit-config.yaml 2024-11-13 21:03:42 +01:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.