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Pedro Alves a9deee17d3 gdb+gdbserver/Linux: avoid reading registers while going through shell
For every stop, Linux GDB and GDBserver save the stopped thread's PC,
in lwp->stop_pc.  This is done in save_stop_reason, in both
gdb/linux-nat.c and gdbserver/linux-low.cc.  However, while we're
going through the shell after "run", in startup_inferior, we shouldn't
be reading registers, as we haven't yet determined the target's
architecture -- the shell's architecture may not even be the same as
the final inferior's.

In gdb/linux-nat.c, lwp->stop_pc is only needed when the thread has
stopped for a breakpoint, and since when going through the shell, no
breakpoint is going to hit, we could simply teach save_stop_reason to
only record the stop pc when the thread stopped for a breakpoint.

However, in gdbserver/linux-low.cc, lwp->stop_pc is used in more cases
than breakpoint hits (e.g., it's used in tracepoints & the
"while-stepping" feature).

So to avoid GDB vs GDBserver divergence, we apply the same approach to
both implementations.

We set a flag in the inferior (process in GDBserver) whenever it is
being nursed through the shell, and when that flag is set,
save_stop_reason bails out early.  While going through the shell,
we'll only ever get process exits (normal or signalled), random
signals, and exec events, so nothing is lost.

Change-Id: If0f01831514d3a74d17efd102875de7d2c6401ad
2022-06-28 18:11:29 +01:00
bfd bfd: handle codepage when opening files on MinGW 2022-06-28 16:55:24 +02:00
binutils windres: add quotes around preprocessor cmd if needed 2022-06-28 16:53:23 +02:00
config
contrib
cpu drop XC16x bits 2022-06-27 11:11:46 +02:00
elfcpp
etc
gas RISC-V: Add 'Sstc' extension and its CSRs 2022-06-28 09:08:42 +08:00
gdb gdb+gdbserver/Linux: avoid reading registers while going through shell 2022-06-28 18:11:29 +01:00
gdbserver gdb+gdbserver/Linux: avoid reading registers while going through shell 2022-06-28 18:11:29 +01:00
gdbsupport Make GDBserver abort on internal error in development mode 2022-06-27 13:55:36 +01:00
gnulib
gold Have gold's File_read::do_read() function check the start parameter 2022-06-27 13:07:40 +01:00
gprof
gprofng gprofng: fix build with -Werror=format-truncation 2022-06-16 20:44:24 -07:00
include RISC-V: Add 'Sstc' extension and its CSRs 2022-06-28 09:08:42 +08:00
intl
ld ld/x86: skip p_align-1 tests with unsuitable compiler 2022-06-28 08:56:06 +02:00
libbacktrace
libctf libctf: tests: prune warnings from compiler output 2022-06-21 19:27:15 +01:00
libdecnumber
libiberty
opcodes drop XC16x bits 2022-06-27 11:11:46 +02:00
readline
sim sim: fix BFD_VMA format arguments on 32-bit hosts [PR gdb/29184] 2022-06-15 23:12:56 +01:00
texinfo
zlib
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.editorconfig
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ar-lib
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compile
config-ml.in
config.guess
config.rpath
config.sub
configure [gdb/build] Fix build breaker with --enable-shared 2022-06-27 15:36:19 +02:00
configure.ac [gdb/build] Fix build breaker with --enable-shared 2022-06-27 15:36:19 +02:00
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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.