Why am I getting “undefined reference to `dladdr’” even with -ldl for this simple program?
Strange linking error: DSO missing from command line
g++ linking order dependency when linking c code to c++ code
GCC/G++ Link Order
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Category Archives: Uncategorized
ARM Stack Frame / Backtrace
ARM: link register and frame pointer
ARM Stack Frame Layout
ARM GCC generated functions prolog
ARM Procedure Call Standard (APCS)
Procedure Call Standard for the ARM Architecture (AAPCS)
On the AAPCS, with an application to efficient parameter passing
ARM to C calling convention, registers to save
General
Der Stack Frame
Deep Wizardry: Stack Unwinding
What is exactly the base pointer and stack pointer? To what do they point?
What is stack unwinding?
Stack Unwinding in C++
github.com/evgeny-panasyuk/stack_unwinding, The stack_unwinding is a small header only C++ library which supplies primitive(class unwinding_indicator) to determining when object destructor is called due to stack-unwinding or due to normal scope leaving.
backtrace
libc Backtraces
How to automatically generate a stacktrace when my gcc C++ program crashes
Backtrace on ARM has repeating entries
libunwind / Call chain
- allows you to easily walk the stack frames
- access to the callee-saved registers contents
- support for resuming execution at a certain frame
The libunwind project
KenWerner/Sandbox/libunwind – Linaro Wiki
Stack frame unwinding on ARM (2011)
#define UNW_LOCAL_ONLY
#include <libunwind.h>
void show_backtrace (void) {
unw_cursor_t cursor; unw_context_t uc;
unw_word_t ip, sp;
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
printf ("ip = %lx, sp = %lx\n", (long) ip, (long) sp);
}
}
libbacktrace
github.com/ianlancetaylor/libbacktrace, A C library that may be linked into a C/C++ program to produce symbolic backtraces (2018)
Android
Before Android 8.0, crashes were handled by the debuggerd and debuggerd64 daemons. In Android O and later, crash_dump32 and crash_dump64 are spawned as needed.
Debugging Native Android Platform Code
android / platform / system / core / libbacktrace
android / platform / system / core / include / backtrace / backtrace.h/a>
android / platform / system / libbacktrace / Backtrace.cpp
android-aosp-sdcard debuggerd backtrace.c, Rewrite libbacktrace using C++
am 98f87d92: Merge “Rewrite libbacktrace using C++.”
backtrace_create_context() dump_backtrace_to_log()
Breakpoint 1, main () at /home/andreas/src/DermoInspectMiniServer/src/tcp_server.cpp:79
79 A();
(gdb) info register pc lr sp fp
pc 0x142824 0x142824 <main()+72>
lr 0x76d7b208 1993847304
sp 0x7efff568 0x7efff568
fp 0x7efff5fc 0x7efff5fc
(gdb) s
A () at /home/andreas/src/DermoInspectMiniServer/src/tcp_server.cpp:72
72 B();
(gdb) info register pc lr sp fp
pc 0x1427d0 0x1427d0 <A()+8>
lr 0x142828 1321000
sp 0x7efff560 0x7efff560
fp 0x7efff564 0x7efff564
(gdb) s
B () at /home/andreas/src/DermoInspectMiniServer/src/tcp_server.cpp:67
67 C();
(gdb) info register pc lr sp fp
pc 0x1427bc 0x1427bc <B()+8>
lr 0x1427d4 1320916
sp 0x7efff558 0x7efff558
fp 0x7efff55c 0x7efff55c
(gdb) s
C () at /home/andreas/src/DermoInspectMiniServer/src/tcp_server.cpp:62
62 MyBacktrace();
(gdb) info register pc lr sp fp
pc 0x1427a8 0x1427a8 <C()+8>
lr 0x1427c0 1320896
sp 0x7efff550 0x7efff550
fp 0x7efff554 0x7efff554
(gdb) s
100 frame = (struct frame*) ctx.uc_mcontext.arm_lr;
(gdb)
102 for (int i = 0; frame && frame->fr_savfp; i++) {
(gdb) info register pc lr sp fp
pc 0x170a74 0x170a74 <MyBacktrace()+32>
lr 0x170a6c 1509996
sp 0x7efff238 0x7efff238
fp 0x7efff54c 0x7efff54c
x86
Raspberry Pi 3, 64-bit
3D Druck (ABS) mit Acetondampf glätten
Windows 1803 and AMD Drivers (OpenGL)
GAMES INCOMPATIBLE WITH WINDOWS 10 VERSION 1803
WINDOWS 10 KB4100375
“OpenGL 3.3 and later is required” – How to update video card driver (Windows Only)
Windows 10 Spring Update + Radeon drivers 18.3.4 = Mega FAIL
Windows 10 (Ver. 1803) – Treiberproblem mit AMD 18.3.4
Every Single Windows Update
Radeon Software Adrenalin Edition 18.4.1 Release Notes
Graphics card stopped working after windows insder update
Windows 10 April 2018 Update problems and issues
Raspberry Pi 3, Fuel Gauge
- MAX17043
SparkFun LiPo Fuel Gauge
github.com/sparkfun/SparkFun_MAX17043_Particle_Library, Firmware library for the MAX17043 LiPo fuel gauge IC – used on SparkFun’s Photon Battery Shield
UPS for Raspberry PI Powerboost or Solar charger?
i2c issues with Adafruit Powerboost 1000C
Battery Widget
Raspberry Pi 3, Switch between AP- and Client-Mode
rPi3-ap-setup.sh, Raspberry Pi 3 access-point-setup
Switch between AP and client mode
Switching between ap and host on pi3 wifi
Schrauben / Zylinderschrauben / Innensechskant / Innensechsrund / INOX
83.1345 – Metallschrauben, Edelstahl rostfrei A2, Zylinderkopf nieder, mit Antrieb Torx TX, ohne Schaft, ISO 14580, BN 15857, FN 1952
83.1340 – Metallschrauben, Stahl blau verzinkt, Zylinderkopf nieder, mit Antrieb Torx TX, Festigkeitsklasse 8.8, ohne Schaft, ISO 14580, BN 4850, FN 361
83.1215 – Metallschrauben, Edelstahl rostfrei A2, Zylinderkopf, mit Antrieb Innensechskant SW, ohne Schaft, DIN 912, ISO 4762, BN 610, FN 123
83.1210 – Metallschrauben, Stahl blau verzinkt, Zylinderkopf, mit Antrieb Innensechskant SW, Festigkeitsklasse 8.8, ohne Schaft, DIN 912, ISO 4762, BN 3, FN 120
BN 15857 – ISO 14580 – Zylinderschrauben, Edelstahl rostfrei
BN 272 – DIN 912 – ISO 4762 – Zylinderschrauben, schwarz
Cinnamon Nemo: Textual Input for the Location Bar
Configure Nemo to always use a textual input for the location bar
dconf
$ sudo apt-get install dconf-editor $ dconf-editor org > nemo > preferences show-location-entry => YES
Raspberry Pi 3, Notizen
dd bs=4M if=2018-04-18-raspbian-stretch.img of=/dev/sdX conv=fsync
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=PARTUUID=20586949-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
# Uncomment some or all of these to enable the optional hardware interfaces dtparam=i2c_arm=on #dtparam=i2s=on dtparam=spi=on # Uncomment this to enable the lirc-rpi module #dtoverlay=lirc-rpi # Additional overlays and parameters are documented /boot/overlays/README # Enable audio (loads snd_bcm2835) dtparam=audio=on enable_uart=1 start_x=1 gpu_mem=128 #dtoverlay=spi-bcm2835 dtoverlay=spi0-hw-cs
pi@raspberrypi:~$ sudo useradd andreas pi@raspberrypi:~$ sudo apt-get install openssh-server Reading package lists... Done Building dependency tree Reading state information... Done openssh-server is already the newest version (1:7.4p1-10+deb9u3). openssh-server set to manually installed. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. pi@raspberrypi:~$ sudo systemctl enable ssh Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install enable ssh Created symlink /etc/systemd/system/sshd.service → /lib/systemd/system/ssh.service. pi@raspberrypi:~$ sudo systemctl start ssh pi@raspberrypi:~$ sudo adduser andreas Adding user `andreas' ... Adding new group `andreas' (1001) ... Adding new user `andreas' (1001) with group `andreas' ... Creating home directory `/home/andreas' ... Copying files from `/etc/skel' ... Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully Changing the user information for andreas Enter the new value, or press ENTER for the default Full Name [Andreas Bachman]: bachman0 Room Number []: Work Phone []: Home Phone []: Other []: Is the information correct? [Y/n] y pi@raspberrypi:~$ sudo vi /etc/sudoers andreas ALL=(ALL) NOPASSWD: ALL pi@raspberrypi:~$ sudo apt-get install samba Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: attr libaio1 libavahi-client3 libcups2 libfile-copy-recursive-perl libgpgme11 libldb1 libpython2.7 libtdb1 libtevent0 python-crypto python-dnspython python-ldb python-samba python-talloc python-tdb samba-common-bin samba-dsdb-modules samba-libs samba-vfs-modules tdb-tools update-inetd Suggested packages: cups-common gpgsm python-crypto-dbg python-crypto-doc python-gpgme bind9 bind9utils ctdb ldb-tools ntp | chrony smbldap-tools winbind ufw heimdal-clients The following NEW packages will be installed: attr libaio1 libavahi-client3 libcups2 libfile-copy-recursive-perl libgpgme11 libldb1 libpython2.7 libtdb1 libtevent0 python-crypto python-dnspython python-ldb python-samba python-talloc python-tdb samba samba-common-bin samba-dsdb-modules samba-libs samba-vfs-modules tdb-tools update-inetd 0 upgraded, 23 newly installed, 0 to remove and 0 not upgraded. Need to get 9,643 kB of archives. After this operation, 49.1 MB of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-dnspython all 1.15.0-1 [102 kB] Get:2 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-crypto armhf 2.6.1-7 [253 kB] Get:3 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libtdb1 armhf 1.3.11-2 [38.0 kB] Get:4 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libtevent0 armhf 0.9.31-1 [24.7 kB] Get:5 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libldb1 armhf 2:1.1.27-1 [92.1 kB] Get:6 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libpython2.7 armhf 2.7.13-2+deb9u2 [914 kB] Get:7 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-ldb armhf 2:1.1.27-1 [30.0 kB] Get:8 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-tdb armhf 1.3.11-2 [15.3 kB] Get:9 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-talloc armhf 2.1.8-1 [11.3 kB] Get:10 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libavahi-client3 armhf 0.6.32-2 [51.3 kB] Get:11 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libcups2 armhf 2.2.1-8 [272 kB] Get:12 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf samba-libs armhf 2:4.5.12+dfsg-2+deb9u2 [4,377 kB] Get:13 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf python-samba armhf 2:4.5.12+dfsg-2+deb9u2 [1,143 kB] Get:14 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf samba-common-bin armhf 2:4.5.12+dfsg-2+deb9u2 [555 kB] Get:15 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf tdb-tools armhf 1.3.11-2 [25.7 kB] Get:16 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libfile-copy-recursive-perl all 0.38-1 [20.6 kB] Get:17 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf update-inetd all 4.44 [20.8 kB] Get:18 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf samba armhf 2:4.5.12+dfsg-2+deb9u2 [869 kB] Get:19 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf attr armhf 1:2.4.47-2 [41.3 kB] Get:20 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libaio1 armhf 0.3.110-3 [9,366 B] Get:21 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf libgpgme11 armhf 1.8.0-3 [141 kB] Get:22 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf samba-dsdb-modules armhf 2:4.5.12+dfsg-2+deb9u2 [304 kB] Get:23 http://mirror.switch.ch/ftp/mirror/raspbian/raspbian stretch/main armhf samba-vfs-modules armhf 2:4.5.12+dfsg-2+deb9u2 [334 kB] Fetched 9,643 kB in 7s (1,259 kB/s) Preconfiguring packages ... Selecting previously unselected package python-dnspython. (Reading database ... 35265 files and directories currently installed.) Preparing to unpack .../00-python-dnspython_1.15.0-1_all.deb ... Unpacking python-dnspython (1.15.0-1) ... Selecting previously unselected package python-crypto. Preparing to unpack .../01-python-crypto_2.6.1-7_armhf.deb ... Unpacking python-crypto (2.6.1-7) ... Selecting previously unselected package libtdb1:armhf. Preparing to unpack .../02-libtdb1_1.3.11-2_armhf.deb ... Unpacking libtdb1:armhf (1.3.11-2) ... Selecting previously unselected package libtevent0:armhf. Preparing to unpack .../03-libtevent0_0.9.31-1_armhf.deb ... Unpacking libtevent0:armhf (0.9.31-1) ... Selecting previously unselected package libldb1:armhf. Preparing to unpack .../04-libldb1_2%3a1.1.27-1_armhf.deb ... Unpacking libldb1:armhf (2:1.1.27-1) ... Selecting previously unselected package libpython2.7:armhf. Preparing to unpack .../05-libpython2.7_2.7.13-2+deb9u2_armhf.deb ... Unpacking libpython2.7:armhf (2.7.13-2+deb9u2) ... Selecting previously unselected package python-ldb. Preparing to unpack .../06-python-ldb_2%3a1.1.27-1_armhf.deb ... Unpacking python-ldb (2:1.1.27-1) ... Selecting previously unselected package python-tdb. Preparing to unpack .../07-python-tdb_1.3.11-2_armhf.deb ... Unpacking python-tdb (1.3.11-2) ... Selecting previously unselected package python-talloc. Preparing to unpack .../08-python-talloc_2.1.8-1_armhf.deb ... Unpacking python-talloc (2.1.8-1) ... Selecting previously unselected package libavahi-client3:armhf. Preparing to unpack .../09-libavahi-client3_0.6.32-2_armhf.deb ... Unpacking libavahi-client3:armhf (0.6.32-2) ... Selecting previously unselected package libcups2:armhf. Preparing to unpack .../10-libcups2_2.2.1-8_armhf.deb ... Unpacking libcups2:armhf (2.2.1-8) ... Selecting previously unselected package samba-libs:armhf. Preparing to unpack .../11-samba-libs_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking samba-libs:armhf (2:4.5.12+dfsg-2+deb9u2) ... Selecting previously unselected package python-samba. Preparing to unpack .../12-python-samba_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking python-samba (2:4.5.12+dfsg-2+deb9u2) ... Selecting previously unselected package samba-common-bin. Preparing to unpack .../13-samba-common-bin_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking samba-common-bin (2:4.5.12+dfsg-2+deb9u2) ... Selecting previously unselected package tdb-tools. Preparing to unpack .../14-tdb-tools_1.3.11-2_armhf.deb ... Unpacking tdb-tools (1.3.11-2) ... Selecting previously unselected package libfile-copy-recursive-perl. Preparing to unpack .../15-libfile-copy-recursive-perl_0.38-1_all.deb ... Unpacking libfile-copy-recursive-perl (0.38-1) ... Selecting previously unselected package update-inetd. Preparing to unpack .../16-update-inetd_4.44_all.deb ... Unpacking update-inetd (4.44) ... Selecting previously unselected package samba. Preparing to unpack .../17-samba_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking samba (2:4.5.12+dfsg-2+deb9u2) ... [ 615.677679] Under-voltage detected! (0x00050005) Selecting previously unselected package attr. Preparing to unpack .../18-attr_1%3a2.4.47-2_armhf.deb ... Unpacking attr (1:2.4.47-2) ... Selecting previously unselected package libaio1:armhf. Preparing to unpack .../19-libaio1_0.3.110-3_armhf.deb ... Unpacking libaio1:armhf (0.3.110-3) ... Selecting previously unselected package libgpgme11:armhf. Preparing to unpack .../20-libgpgme11_1.8.0-3_armhf.deb ... Unpacking libgpgme11:armhf (1.8.0-3) ... Selecting previously unselected package samba-dsdb-modules. Preparing to unpack .../21-samba-dsdb-modules_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking samba-dsdb-modules (2:4.5.12+dfsg-2+deb9u2) ... Selecting previously unselected package samba-vfs-modules. Preparing to unpack .../22-samba-vfs-modules_2%3a4.5.12+dfsg-2+deb9u2_armhf.deb ... Unpacking samba-vfs-modules (2:4.5.12+dfsg-2+deb9u2) ... Setting up python-dnspython (1.15.0-1) ... Setting up libtdb1:armhf (1.3.11-2) ... Setting up python-crypto (2.6.1-7) ... Setting up libgpgme11:armhf (1.8.0-3) ... Setting up libtevent0:armhf (0.9.31-1) ... Processing triggers for libc-bin (2.24-11+deb9u3) ... Setting up libaio1:armhf (0.3.110-3) ... Processing triggers for systemd (232-25+deb9u2) ... Setting up libpython2.7:armhf (2.7.13-2+deb9u2) ... Setting up tdb-tools (1.3.11-2) ... update-alternatives: using /usr/bin/tdbbackup.tdbtools to provide /usr/bin/tdbbackup (tdbbackup) in auto mode Processing triggers for man-db (2.7.6.1-2) ... [ 626.077803] Under-voltage detected! (0x00050005) Setting up libavahi-client3:armhf (0.6.32-2) ... Setting up attr (1:2.4.47-2) ... Setting up libfile-copy-recursive-perl (0.38-1) ... Setting up libcups2:armhf (2.2.1-8) ... Setting up python-talloc (2.1.8-1) ... Setting up update-inetd (4.44) ... Setting up python-tdb (1.3.11-2) ... Setting up libldb1:armhf (2:1.1.27-1) ... Setting up python-ldb (2:1.1.27-1) ... Setting up samba-libs:armhf (2:4.5.12+dfsg-2+deb9u2) ... Setting up samba-vfs-modules (2:4.5.12+dfsg-2+deb9u2) ... Setting up python-samba (2:4.5.12+dfsg-2+deb9u2) ... Setting up samba-common-bin (2:4.5.12+dfsg-2+deb9u2) ... Setting up samba-dsdb-modules (2:4.5.12+dfsg-2+deb9u2) ... Setting up samba (2:4.5.12+dfsg-2+deb9u2) ... Adding group `sambashare' (GID 113) ... Done. Samba is not being run as an AD Domain Controller, masking samba-ad-dc-service. Please ignore the following error about deb-systemd-helper not finding samba-ad-dc-service. Created symlink /etc/systemd/system/multi-user.target.wants/nmbd.service → /lib/systemd/system/nmbd.service. [ 642.717966] Under-voltage detected! (0x00050005) Failed to preset unit: Unit file /etc/systemd/system/samba-ad-dc.service is masked. /usr/bin/deb-systemd-helper: error: systemctl preset failed on samba-ad-dc.service: No such file or directory Created symlink /etc/systemd/system/multi-user.target.wants/smbd.service → /lib/systemd/system/smbd.service. Processing triggers for libc-bin (2.24-11+deb9u3) ... Processing triggers for systemd (232-25+deb9u2) ... $ sudo vi /etc/samba/smb.conf security = user read only = no $ sudo /etc/init.d/samba restart Restarting nmbd (via systemctl): nmbd.service. Restarting smbd (via systemctl): smbd.service. $ sudo smbpasswd -a andreas New SMB password: Retype new SMB password: Added user andreas.