i try to debug a program for find to floating point exception location on beaglebone black debian i installed libc6 and libc6-dbg but still
From To Syms Read Shared Object Library
0xb6fda7c0 0xb6ff32b0 Yes (*) /lib/ld-linux.so.3
0xb6f24200 0xb6f8af00 Yes (*) /lib/arm-linux-gnueabi/libm.so.6
0xb6f06668 0xb6f17e74 Yes (*) /lib/arm-linux-gnueabi/libgcc_s.so.1
0xb6dd44a0 0xb6eca348 Yes (*) /lib/arm-linux-gnueabi/libc.so.6
(*): Shared library is missing debugging information.
seems like this.
and my debug directory is:
The directory where separate debug symbols are searched for is "/usr/lib/debug"
floating point exception appear like this
Program received signal SIGFPE, Arithmetic exception.
0xb6de9a98 in raise () from /lib/arm-linux-gnueabi/libc.so.6
You appear to be using GDB with remote debugging, possibly on an x86 host.
i installed libc6 and libc6-dbg
You need to install libc6-dbg for the arm (matching your arm target libc build). Installing libc6-dbg for host does you no good.
Related
I have below libs in /usr/lib path(stripped) which needs to be replaced with unstripped types.
/usr/lib/libdbus-1.so.3.14.7
/usr/lib/liblog4c.so.3.3.0
/usr/lib/libnetsnmp.so.40.0.0
/lib/ld-2.24.so
As I need to run valgrind for one of my process (say : snmp agent process), having libs with debug symbols will help in identifying file location, function name info.
From /proc/$pid/maps file found that in addition to snmp agent process, there are some other processes also using these listed libraries. So what will happen to these processes when I replace the existing stripped libs with unstripped libraries in the same path.
or
How to run valgrind without disturbing other processes which are using the libs of interest.
Exactly what operating system are you using?
Normally the way that you should do this is to install the debuginfo packages. Most Linux distributions split out the debuginfo, so that you can install stripped binaries but also optionally install the separate debuginfo. Tools like gdb and Valgrind know where to look for the debuginfo files and will read them when needed.
If you do that then you should not need to install un-stripped binaries.
I've installed (OSX Mojave 10.14.6.) Eclipse CDT and GNU MCU Eclipse plugin and finaly GNU Tools for ARM. My goal is to build and debug ARM code using GDB (arm-none-eabi-gdb).
I've created a Hello World project for Arm, which builds ok - but, debugging seems not to work with GDB (that comes with the Arm package). GDB gets stuck:
I have set the proper paths in Eclipse to arm-none-eabi-gdb.
I have signed the arm-none-eabi-gdb (with the same certificate that I used to sign GDB installed via brew into /usr/local/bin/gdb the day before - and it worked!).
I have also tried running Eclipse as root from command line.
Nothing helps.
The message is "Configuring GDB Aborting configuring GDB".
What to do?
Probably what is going on here is that you built to a given target (ARM based) and you're trying to run it (with gdb) on your mac (x86).
You'll need an emulator or QEMU to properly run on your mac or maybe a real board.
I'm trying to cross-build LÖVE (https://love2d.org) for an ARM Linux device (Rockchip RK3066) from Ubuntu 16.04.
As the documentation says, I installed all dependencies on Ubuntu and was able to build it (for Ubuntu, as a test). Now I'm going for the cross-build.
Before building, I have to run ./configure. So far I've been able to get the toolchain's gcc compiler to be accepted, but when it looks for the dependencies, I get this error:
checking for luajit5.1... no
checking for luajit51... no
checking for luajit... no
configure: error: Package requirements (luajit) were not met:
No package 'luajit' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables lua_CFLAGS
and lua_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
Could this be fixed by cross-building luajit for the device and add it to the toolchain binaries, or could I just try to make the ./configure script look for the luajit I installed in Ubuntu?
If it's the latter, would someone kindly point me on the right direction? I've opened like 20 pages already with a similar error message and none of them had a valid answer.
Thanks a lot in advance.
I try to debug some native code on Android with GBD. The code wasn't created by me and is not in an Android project, so I can't use the ndk-gdb tool. I use gdbserver on the android machine and connect to it from my mac with the normal GDB program. I try to load all the libraries (which should have symbols according to objdump tool), but gdb tells me that it does not load the symbols (according to the gdb command “info sharedLibrary”). These are the steps I took:
start gdbserver on Android machine
start GDB with the debug version of the binary
gdb symbols/system/bin/mediaserver
the following commands are executed in gdb itself
tell gdb where to look for the libraries with symbols
(gdb) set solib-search-path symbols/system/lib
tell gdb where to find the source files
(gdb) directory /sources
connect to remote target (Android machine)
(gdb) target remote 192.168.1.10:5039
GDB connects successfully to the running binary and I can pause and continue the execution. But it does not show me any debug information like function names or line numbers. It only shows adresses. When I check the status of the used libraries, I see that gdb thinks, they don’t have any symbols:
command in gdb:
(gdb) info sharedLibrary
From To Syms Read Shared Object Library
0x00003700 0x0000ff0c Yes /symbols/system/bin/linker
No libc.so
No libstdc++.so
No libm.so
No liblog.so
No libcutils.so
No libspeexresampler.so
No libaudioutils.so
No libgccdemangle.so
No libamplayer.so
Now for example the last library. When I check with the file command (not in gdb), it tells me that it is a not stripped library (the library is located in the "symbols/system/lib" folder).
file libamplayer.so
Output:
libamplayer.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked, not stripped
objdump command shows a lot of symbols in it (I don’t show the output because it’s very long). So why does gdb not recognise the symbols in this libraries? I thought, at least line numbers and function names are present in not stripped versions of libraries. Or am I wrong? It would be very nice if someone could give me more insight.
Thanks!
System info:
GDB Version: 7.3.1-gg2 on Mac OS X Mavericks
The code wasn't created by me and is not in an Android project, so I can't use the ndk-gdb tool.
Your conclusion does not at all follow. ndk-gdb should be able to debug any Android program, whether created as a "project" or via other means.
I use gdbserver on the android machine and connect to it from my mac with the normal GDB program.
The normal GDB is likely not configured for cross-debugging, and thus doesn't understand ARM binaries at all. I am surprised you get as far using it as you do.
I'm trying to use GDB to debug (to find an annoying segfault). When I run:
gdb ./filename
from the command line, I get the following error:
This GDB was configured as "i686-pc-linux-
gnu"..."/path/exec": not in executable
format: File format not recognized
When I execute:
file /path/executable/
I get the following info:
ELF 64-bit LSB executable, AMD x86-64,
version 1 (SYSV), for GNU/Linux 2.4.0,
dynamically linked (uses shared libs), not stripped
I am using GDB 6.1, and the executable is compiled with gcc version 3.4.6.
I'm a little out of my water in terms of using gdb, but as far as I can tell it should be working in this instance. Any ideas what's going wrong?
The executable is 64-bit (x86-64) and the debugger is a 32 bit (i686-pc-linux) build. You may need to install a 64-bit (x86-64) version of the debugger.
I'm not sure if this is your problem, but I faced this situation very often. The executable in the build tree, build by make/automake is not a binary, but a script, so you cannot use gdb with it. Try to install the application and change the directory, because else gdb tries to debug the script.
The question refers to "./filename" and to "/path/executable". Are these the same file?
If you are doing a post-mortem analysis, you would run:
gdb executable-file core-file
If you are going to ignore the core file, you would run:
gdb executable-file
In both cases, 'executable-file' means a pathname to the binary you want to debug. Most usually, that is actually a simple filename in the current directory, since you have the source code from your debug build there.
On Solaris, a 64-bit build of GDB is supposed to be able to debug both 32-bit and 64-bit executables (though I've had some issues with recent versions of GDB). I'm not sure of the converse - that a 32-bit GDB can necessarily debug 64-bit executables.
What you need to be checking, is really the bfd library. The binary file descriptor library is what binutils / gdb uses to actually parse and handle binaries (ELF/a.out etc..).
You can see the current supported platforms via objdump;
# objdump -H
objdump: supported targets: elf32-powerpc aixcoff-rs6000 elf32-powerpcle ppcboot elf64-powerpc elf64-powerpcle elf64-little elf64-big elf32-little elf32-big srec symbolsrec tekhex binary ihex
objdump: supported architectures: rs6000:6000 rs6000:rs1 rs6000:rsc rs6000:rs2 powerpc:common powerpc:common64 powerpc:603 powerpc:EC603e powerpc:604 powerpc:403 powerpc:601 powerpc:620 powerpc:630 powerpc:a35 powerpc:rs64ii powerpc:rs64iii powerpc:7400 powerpc:e500 powerpc:MPC8XX powerpc:750
The following PPC specific disassembler options are supported for use with
the -M switch:
booke|booke32|booke64 Disassemble the BookE instructions
e300 Disassemble the e300 instructions
e500|e500x2 Disassemble the e500 instructions
efs Disassemble the EFS instructions
power4 Disassemble the Power4 instructions
power5 Disassemble the Power5 instructions
power6 Disassemble the Power6 instructions
32 Do not disassemble 64-bit instructions
64 Allow disassembly of 64-bit instructions
It seems your GNU Debugger (gdb) doesn't support x86_64 architecture.
So try LLDB Debugger (lldb) which aims to replace it. It supports i386, x86-64 and ARM instruction sets.
It's available by default on BSD/OS X, on Linux install via: sudo apt-get install lldb (or use yum).
See: gdb to lldb command map page for more info.