Go to file
Jan Kratochvil 5f3ff4f893 Fix internal error on DW_OP_bregx(-1)
https://bugzilla.redhat.com/show_bug.cgi?id=1270564#c15
https://bugzilla.redhat.com/attachment.cgi?id=1081772

clang-3.5.0-9.fc22.x86_64
 <3><22b2>: Abbrev Number: 69 (DW_TAG_variable)
    <22b3>   DW_AT_location    : 7 byte block: 92 ff ff ff ff f 0	(DW_OP_bregx: 4294967295 (r-1) 0)
    <22bb>   DW_AT_name        : (indirect string, offset: 0x2a36): texture_data
    <22c1>   DW_AT_type        : <0x1d3>

(gdb) p variable
warning: Unmapped DWARF Register #-1 encountered.
regcache.c:177: internal-error: register_size: Assertion `regnum >= 0 && regnum < (gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs
(gdbarch))' failed.
[...]
Quit this debugging session? (y or n) FAIL: gdb.dwarf2/dw2-regno-invalid.exp: p variable (GDB internal error)

-> (x86_64)
(gdb) p variable
warning: Unmapped DWARF Register #-1 encountered.
Invalid register #-1, expecting 0 <= # < 220
(gdb) PASS: gdb.dwarf2/dw2-regno-invalid.exp: p variable
-> (i386)
(gdb) p variable
Invalid register #104, expecting 0 <= # < 104
(gdb) PASS: gdb.dwarf2/dw2-regno-invalid.exp: p variable

GDB calls gdbarch_dwarf2_reg_to_regnum() first which returns -1 in the x86_64
case
  if (regnum == -1)
    warning (_("Unmapped DWARF Register #%d encountered."), reg);
but in i386 case it does:
  /* This will hopefully provoke a warning.  */
  return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
and the default implementation is a nop, leaving whatever register number
the DWARF specified.

gdb/ChangeLog
2015-10-20  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* findvar.c (address_from_register): Check REGNUM validity.

gdb/testsuite/ChangeLog
2015-10-20  Jan Kratochvil  <jan.kratochvil@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	* gdb.dwarf2/dw2-regno-invalid.exp: New file.
	* lib/dwarf.exp (Dwarf): Add DW_OP_bregx.
2015-10-20 20:40:38 +02:00
bfd Correct printed value of Main in mmo.c consistency error message. 2015-10-20 06:56:33 +02:00
binutils Fix PR binutils/19147 -- off by one when printing NT_FILE note. 2015-10-18 09:39:25 -07:00
config
cpu
elfcpp Add EM_IAMCU support to gold 2015-10-13 09:02:41 -07:00
etc
gas Add --enable-compressed-debug-sections={all,gas,gold,ld} 2015-10-20 08:58:25 -07:00
gdb Fix internal error on DW_OP_bregx(-1) 2015-10-20 20:40:38 +02:00
gold Feed right input object to x86_64_mov_to_lea1[12] 2015-10-20 10:46:47 -07:00
gprof
include
intl
ld Add test to ensure that ternary linker script operators copy symbol flags. 2015-10-19 14:32:54 +01:00
libdecnumber
libiberty
opcodes Add missing changelog entries 2015-10-14 12:19:39 +02:00
readline
sim sim: ft32: test coverage for link parameters and PM write port 2015-10-12 20:23:26 -04:00
texinfo
zlib
.cvsignore
.gitattributes
.gitignore
ChangeLog Add --enable-compressed-debug-sections={all,gas,gold,ld} 2015-10-20 08:58:25 -07:00
compile
config-ml.in
config.guess
config.rpath
config.sub
configure Add --enable-compressed-debug-sections={all,gas,gold,ld} 2015-10-20 08:58:25 -07:00
configure.ac Add --enable-compressed-debug-sections={all,gas,gold,ld} 2015-10-20 08:58:25 -07:00
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
Makefile.def
Makefile.in
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release.sh
symlink-tree
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.