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Scott Linder 22b9b4b05b gdb: support frames inlined into the outer frame
Remove the restriction (gdb_assert) that prevents creating frames
inlined in the outer frame.  Like for frames inlined in a standard frame
(FID_STACK_VALID), a frame inlined into the outer frame will have:

 - artificial_depth greater than 0
 - code_addr equal to the first executed instruction in the block
   corresponding to the inlined function

It will however have its stack_status set to FID_STACK_OUTER, like the
outer frame.

This is not typically seen on your everyday system (e.g. a Linux /
x86-64 process), because the outer frame would be for instance the
_start function, probably written in assembly and very unlikely to have
anything inlined in it.  However this could happen in more "bare-metal"
scenarios.  In particular, this was seen in ROCm GDB [1], where the
compiler does inline functions in the top-level kernel functions (kernel
in the sense of compute kernel, not userspace vs kernel).

I however wrote a test that replicates the issue on x86-64 and a few
other arches I had access to.  Since we need to control precisely the
emitted DWARF CFI, I didn't find another way than to write it in
assembly.  The DWARF is generated using the testsuite's DWARF assembler,
except the unwind information, which is written using CFI directives
(and therefore generated by the actual assembler).  I think the test is
adequately commented, but if anything is unclear, just ask and I'll add
more info.

[1] https://github.com/ROCm-Developer-Tools/ROCgdb/

gdb/ChangeLog:

YYYY-MM-DD  Scott Linder  <scott@scottlinder.com>
YYYY-MM-DD  Simon Marchi  <simon.marchi@efficios.com>

	* inline-frame.c (inline_frame_this_id): Remove assert that prevents
	inline frame ids in outer frame.

gdb/testsuite/ChangeLog:

	* gdb.dwarf2/frame-inlined-in-outer-frame.exp: New file.
	* gdb.dwarf2/frame-inlined-in-outer-frame.S: New file.

Change-Id: I8aa129c667dccc31590ffdf426586418493a6ebe
2020-08-31 13:25:05 -04:00
bfd PR26493 UBSAN: elfnn-riscv.c left shift of negative value 2020-08-31 20:28:10 +09:30
binutils readelf: ubsan: shift exponent 32 is too large 2020-08-30 20:49:32 +09:30
config Unify Solaris procfs and largefile handling 2020-07-30 15:41:50 +02:00
contrib contrib: Update dg-extract-results.* from gcc 2020-05-15 11:41:22 +01:00
cpu bpf: add xBPF ISA 2020-08-26 15:39:00 +02:00
elfcpp CSKY: Support attribute section. 2020-08-28 17:23:24 +08:00
etc texi2pod.pl: import support for @t{...} from gcc 2020-01-15 12:58:09 -05:00
gas PR26510 UBSAN: tc-z8k.c left shift of negative value 2020-08-31 20:28:13 +09:30
gdb gdb: support frames inlined into the outer frame 2020-08-31 13:25:05 -04:00
gdbserver gdb: allow specifying multiple filters when running selftests 2020-08-13 07:55:48 -04:00
gdbsupport gdb: allow specifying multiple filters when running selftests 2020-08-13 07:55:48 -04:00
gnulib Update gnulib to current trunk 2020-08-26 15:37:28 -07:00
gold PowerPC TPREL_HA/LO optimisation 2020-08-24 21:15:06 +09:30
gprof Unify Solaris procfs and largefile handling 2020-07-30 15:41:50 +02:00
include PR26493 UBSAN: elfnn-riscv.c left shift of negative value 2020-08-31 20:28:10 +09:30
intl Regen with blessed automake-1.15.1 2020-02-20 13:02:24 +10:30
ld ld: Add $NOSANTIZE_CFLAGS to more linker tests 2020-08-30 07:28:17 -07:00
libctf libctf, binutils, include, ld: gettextize and improve error handling 2020-08-27 13:15:43 +01:00
libdecnumber Run autoreconf -vf throughout 2020-07-29 16:03:55 -04:00
libiberty Sync config, include and libiberty with GCC 2020-06-24 16:52:48 -07:00
opcodes CSKY: Refine operand format error reporting. 2020-08-31 11:32:18 +08:00
readline Update readline/README to mention patchlevel 2020-06-30 15:17:07 -06:00
sim sim/bfin: include config/pkg.m4 in configure.ac 2020-08-21 11:55:08 -04:00
texinfo
zlib Merge changes from GCC for the config/ directory 2020-02-19 17:51:24 +00:00
.cvsignore
.gitattributes
.gitignore Add profiling outputs to .gitignore 2019-12-26 06:54:58 +01:00
ar-lib
ChangeLog PKG_CHECK_MODULES: Check if $pkg_cv_[]$1[]_LIBS works 2020-07-28 03:56:34 -07:00
compile
config-ml.in
config.guess Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
config.rpath
config.sub Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
configure config/debuginfod.m4: Use PKG_CHECK_MODULES 2020-07-24 15:16:20 -04:00
configure.ac config/debuginfod.m4: Use PKG_CHECK_MODULES 2020-07-24 15:16:20 -04:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS Move gdbserver to top level 2020-02-07 08:42:25 -07:00
Makefile.def Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.in Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.tpl Revert "Sync top level files with versions from gcc." 2019-05-30 11:17:19 +01:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode
setup.com
src-release.sh Move gdbserver to top level 2020-02-07 08:42:25 -07:00
symlink-tree
test-driver
ylwrap

		   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.