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Luis Machado 1e735120b9 Refactor parsing of /proc/<pid>/smaps
The Linux kernel exposes the information about MTE-protected pages via the
proc filesystem, more specifically through the smaps file.

What we're looking for is a mapping with the 'mt' flag, which tells us that
mapping was created with a PROT_MTE flag and, thus, is capable of using memory
tagging.

We already parse that file for other purposes (core file
generation/filtering), so this patch refactors the code to make the parsing
of the smaps file reusable for memory tagging.

The function linux_address_in_memtag_page uses the refactored code to allow
querying for memory tag support in a particular address, and it gets used in the
next patch.

gdb/ChangeLog:

2021-03-24  Luis Machado  <luis.machado@linaro.org>

	* linux-tdep.c (struct smaps_vmflags) <memory_tagging>: New flag
	bit.
	(struct smaps_data): New struct.
	(decode_vmflags): Handle the 'mt' flag.
	(parse_smaps_data): New function, refactored from
	linux_find_memory_regions_full.
	(linux_address_in_memtag_page): New function.
	(linux_find_memory_regions_full): Refactor into parse_smaps_data.
	* linux-tdep.h (linux_address_in_memtag_page): New prototype.
2021-03-24 14:54:50 -03:00
bfd Automatic date update in version.in 2021-03-24 00:00:06 +00:00
binutils Add startswith function and use it instead of CONST_STRNEQ. 2021-03-22 11:01:43 +01:00
config GCC_CET_HOST_FLAGS: Check if host supports multi-byte NOPs 2021-03-18 08:02:46 -07:00
contrib Import mklog.py from gcc repo 2020-09-25 10:24:44 -04:00
cpu Add Changelog entries and NEWS entries for 2.36 branch 2021-01-09 10:40:28 +00:00
elfcpp Add DWARF 5 support in gold. 2021-03-19 13:55:35 -07:00
etc Update year range in copyright notice of binutils files 2021-01-01 10:31:05 +10:30
gas x86: derive opcode length from opcode value 2021-03-24 08:33:33 +01:00
gdb Refactor parsing of /proc/<pid>/smaps 2021-03-24 14:54:50 -03:00
gdbserver AArch64: Add MTE register set support for GDB and gdbserver 2021-03-24 14:52:57 -03:00
gdbsupport Provide an inline startswith function in bfd.h 2021-03-21 23:00:32 +10:30
gnulib gnulib: update to 776af40e0 2021-02-05 13:35:20 -05:00
gold Use stdout when printing object file names for -t option. 2021-03-19 18:41:12 -07:00
gprof Regen Makefile.in for jobserver.m4 aclocal.m4 dependency 2021-01-13 22:06:02 +10:30
include AArch64: Add MTE register set support for GDB and gdbserver 2021-03-24 14:52:57 -03:00
intl intl: turn LIBINTL into -L / -l form 2021-02-10 15:26:57 +00:00
ld Add startswith function and use it instead of CONST_STRNEQ. 2021-03-22 11:01:43 +01:00
libctf Provide an inline startswith function in bfd.h 2021-03-21 23:00:32 +10:30
libdecnumber Run autoreconf -vf throughout 2020-07-29 16:03:55 -04:00
libiberty GCC_CET_HOST_FLAGS: Check if host supports multi-byte NOPs 2021-03-18 08:02:46 -07:00
opcodes x86: derive opcode length from opcode value 2021-03-24 08:33:33 +01:00
readline Fix Readline 8.1 build on mingw 2021-03-02 13:42:37 -07:00
sim sim: rename BUILD_LDFLAGS to LDFLAGS_FOR_BUILD 2021-03-13 11:21:13 -05:00
texinfo
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ChangeLog Add install dependencies for ld -> bfd and libctf -> bfd 2021-03-18 12:40:40 +00:00
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config.guess Update config.sub and config.guess 2021-01-05 15:55:59 +10:30
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config.sub config.sub update broke powerpc-eabivle 2021-01-07 08:56:28 +10:30
configure Remove arm-symbianelf 2021-02-09 23:36:16 +10:30
configure.ac Remove arm-symbianelf 2021-02-09 23:36:16 +10:30
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libtool.m4 GCC: Check if AR works with --plugin and rc 2021-01-11 16:26:51 -08:00
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MAINTAINERS Move gdbserver to top level 2020-02-07 08:42:25 -07:00
Makefile.def Add install dependencies for ld -> bfd and libctf -> bfd 2021-03-18 12:40:40 +00:00
Makefile.in Add install dependencies for ld -> bfd and libctf -> bfd 2021-03-18 12:40:40 +00:00
Makefile.tpl Add missing changes to Makefile.tpl 2021-02-28 04:39:38 -08:00
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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.