Hello,
I have some issues with a driver (esp_hosted_ng):
I have read these links:
Currently for the debugging this is what I am doing:
0. Configure U-Boot:
setenv setbootargs 'setenv bootargs rw rootwait earlycon root=${mmcroot} rdinit=/sbin/init loglevel=7 ignore_loglevel nohlt pti=0 maxcpus=1' saveenv saveenv boot
systemctl disable watchdog
# PC Side scp /path_to/esp-hosted-ng.ko [email protected]:/lib/modules/5.10.201-cip41-yocto-standard/extra # Device side depmod -a modprobe esp_hosted_ng
5. Get the addresses of .text,.data,.bss... of the module when loaded:
BASE_ESP_DIR=/sys/module/esp_hosted_ng/sections && echo "add-symbol-file /path_to/esp-hosted-ng.ko $(cat $BASE_ESP_DIR/.text) -s .data $(cat $BASE_ESP_DIR/.data) -s .bss $(cat $BASE_ESP_DIR/.bss) -s .rodata.str1.8 $(cat $BASE_ESP_DIR/.rodata.str1.8)"
/path_to_from_yocto_toolchain/aarch64-poky-linux-gdb /path_to/vmlinux add-symbol-file /path_to/esp-hosted-ng.ko 0xffff800008b25000 -s .data 0xffff800008b35000 -s .bss 0xffff800008b363c0 -s .rodata.str1.8 0xffff800008b31350
7. Start KGDB on the device:
echo ttyS0,115200 > /sys/module/kgdboc/parameters/kgdboc echo g > /proc/sysrq-trigger
8. On the computer start debuging using GDB:
set substitute-path /usr/src/kernel /path_to/kernel-source show substitute-path break sdio/esp_sdio.c:esp_probe break drivers/base/dd.c:really_probe set serial baud 115200 target remote /dev/ttyUSB0 next continue
Doing like this makes the debug working on console but there are some issues:
GDB Logs:
$ /opt/my_toolchain/5.10-hardknott/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gdb /path_to/vmlinux GNU gdb (GDB) 10.1 Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-pokysdk-linux --target=aarch64-poky-linux". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /path_to/vmlinux... (gdb) set substitute-path /usr/src/kernel /path_to/kernel-source (gdb) show substitute-path List of all source path substitution rules: `/usr/src/kernel' -> `/path_to/kernel-source'. (gdb) break drivers/base/dd.c:really_probe Breakpoint 1 at 0xffff80001062a3a0: file /usr/src/kernel/include/asm-generic/atomic-instrumented.h, line 28. (gdb) set serial baud 115200 (gdb) target remote /dev/ttyUSB0 Remote debugging using /dev/ttyUSB0 [Switching to Thread 4294967294] arch_kgdb_breakpoint () at /usr/src/kernel/arch/arm64/include/asm/kgdb.h:21 21 asm ("brk %0" : : "I" (KGDB_COMPILED_DBG_BRK_IMM)); (gdb)
I also try to use the proxy tool:
git clone http://git.kernel.org/pub/scm/utils/kernel/kgdb/agent-proxy.git cd agent-proxy ; make ./agent-proxy 5550^5551 0 /dev/ttyUSB0,115200 # telnet 127.0.0.1 5550 is OK (i have the prompt) # gdbserver on 127.0.0.1 5551 is always broken: (gdb) target remote 127.0.0.1:5551 Remote debugging using 127.0.0.1:5551 Ignoring packet error, continuing... warning: unrecognized item "timeout" in "qSupported" response Ignoring packet error, continuing... Remote replied unexpectedly to 'vMustReplyEmpty': timeout (gdb)
Did someone know how to debug a kernel module on eclipse ?
Did someone know how to fix substitute path feature ?
Has someone already managed to debug on RZG2UL boards the kernel ?
Is it possible to use the USB port for debuging instead of ttyS0 ?
My kernel configuration looks like this:
CONFIG_KALLSYMS=y CONFIG_KPROBES=y CONFIG_KRETPROBES=y # CONFIG_SERIAL_KGDB_NMI is not set CONFIG_CONSOLE_POLL=y CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 CONFIG_MAGIC_SYSRQ_SERIAL=y CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE="" CONFIG_KGDB=y CONFIG_KGDB_HONOUR_BLOCKLIST=y CONFIG_KGDB_SERIAL_CONSOLE=y # CONFIG_KGDB_TESTS is not set # CONFIG_KGDB_KDB is not set # CONFIG_FUNCTION_ERROR_INJECTION is not set # CONFIG_KPROBES_SANITY_TEST is not set CONFIG_DEBUG_INFO=y # CONFIG_DEBUG_INFO_REDUCED is not set # CONFIG_DEBUG_INFO_COMPRESSED is not set # CONFIG_DEBUG_INFO_SPLIT is not set # CONFIG_DEBUG_INFO_DWARF4 is not set # CONFIG_DEBUG_INFO_BTF is not set CONFIG_GDB_SCRIPTS=y