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gdb [2016/11/21 12:19] – [breakpoints] niziakgdb [2025/05/28 07:16] (current) – [stepping] niziak
Line 1: Line 1:
 +====== GDB ======
 +
 ====== Starting  ====== ====== Starting  ======
 <code> <code>
 gdb <executable> gdb <executable>
 gdb --args <executable> arg1 arg2 arg3 gdb --args <executable> arg1 arg2 arg3
 +gdb -x gdbcommands --init-commands=gdb-openocd.cfg
 +</code>
 +
 +====== Symbols and paths =====
 +
 +Add symbols:
 +<code>
 +symbol-file /mnt/nfs/binary-with-symbols.elf
 +dir /mnt/nfs/src
 </code> </code>
  
 +====== Using ======
  
 ==== getting info ==== ==== getting info ====
-  * p[rint] var+set print pretty on 
 +  * p[rint] <name> - print value 
 +    * p * <name> - print what is pointed by 
 +    * p/x <name> - print in hex format 
 +    * p <name> @<n> print <n> values starting at <name> 
 +    * p <chars> <TAB> - List all variables starting with <chars> 
 +    * p ((sturct dummy*)variable)[0] - Dump structure members
   * ptype var   * ptype var
   * x /100bx m - eXamine memory located by variable m, print 100 bytes in hex format   * x /100bx m - eXamine memory located by variable m, print 100 bytes in hex format
Line 20: Line 38:
  
 ==== breakpoints ==== ==== breakpoints ====
-  * break malloc+  * b[reak] malloc 
 +  * b mall <TAB> - List all starting with mall
   * clear malloc   * clear malloc
   * info break   * info break
 +    * i[nfo] b
 +  * dis[able] 1 - disable brakpoint 1
 +  * en[able] 1
 +  * d[elete] 1
 +  * d 1 2
 +  * d - delete all breakpoints
 +  * cond[ition] 1 <expr> - stop at breakpoint 1 only if <expr> is true
 +  * cond 1 - Remove condition from breakpoint 1
 +
 +Add to C code to catch timing critical issues:
 +<code c>
 +if (p_queue->p_cb->locked) {
 +  __BKPT(8);
 +}
 +</code>
  
 ==== stepping ==== ==== stepping ====
-  * s [tep] 
-  * c [ontinue] <num_to_ignore> 
-  * n [ext] - to next line 
-  * fin [ish] - execute until stack frame returns 
-  * u [ntil] <line number> - execute to line (to avoid loops) 
  
 +  * **s** [tep] - step to next **source** line
 +  * **c** [ontinue] <num_to_ignore>
 +  * **n** [ext] - step (do not enter to subroutines)
 +  * **fin** [ish] - execute until stack frame returns
 +  * **u** [ntil] <line number> - execute to line (to avoid loops)
 +  
 +Skip current command:
 +<code>
 +tbreak +1
 +jump +1
 +</code>
 +==== infos ====
 +  * show debug-file-directory
 +
 +==== threads ====
 +  * info threads - show info about threads
 +  * thread 4 - switch to thread 4
 +  * print mutex
 +  * info line - print current code line
 +  * frame - print current execution position and code
 +
 +==== OpenOCD ====
 +Disable Cortex M0 interrupts
 +  * mon cortex_m maskisr on
 +
 +<code>
 +set remote hardware-breakpoint-limit 4
 +set remote hardware-watchpoint-limit 2
 +define hook-step
 +mon cortex_m maskisr on
 +end
 +define hookpost-step
 +mon cortex_m maskisr off
 +end
 +</code>
 +
 +===== gdbcommands file =====
 +<file | gdbcommands>
 +set verbose on
 +set auto-load safe-path /
 +set debug auto-load on
 +
 +set sysroot /home/user/prj/buildroot/output/target
 +
 +source ../../interactive/src
 +
 +set substitute-path /usr/sbin/app /apps/app/app
 +
 +add-symbol-file /home/user/prj/stm32/main/bootloader/build/bin/main.elf 0x08005000
 +
 +dir ../../out/build/app-undefined
 +dir ../../out/build/app-undefined/apps/app
 +dir ../../out/build/app-undefined/apps/app/app
 +
 +set substitute-path /usr/lib ../../out/target/usr/lib
 +
 +set args -m 0 -c /etc/conf.d/conf.xml
 +
 +#sharedlibrary
 +
 +#target extended-remote 192.168.1.62:12345
 +
 +break myFunction
 +</file>
 +
 +<file | gdb-openocd.cfg>
 +target extended-remote localhost:2331
 +#monitor reset
 +monitor halt
 +
 +# Setup GDB FOR FASTER DOWNLOADS
 +#set remote memory-write-packet-size 1024
 +#set remote memory-write-packet-size fixed
 +</file>
 +
 +<file>
 +# Add GDB access to mem range where VTOR is located
 +mem 0xE0000000 0xE00FFFFF
 +
 +define bootapp
 +  monitor reset halt
 +  # Adjust VTOR (Vector table offset register)
 +  set {int}0xE000ED08 = &exception_table
 +  # Set SP/PC to the values from the actual vector table
 +  set $sp = *(int*)&exception_table
 +  set $pc = *((int*)(&exception_table)+1)
 +end
 +</file>
 ==== symbols ==== ==== symbols ====
   * set symbol-reloading on   * set symbol-reloading on
   * add-symbol-file ~/mymodule.o 0xd8be4000   * add-symbol-file ~/mymodule.o 0xd8be4000
 +  * add-symbol-file ~/myanother.o 0x12341234
 +
 +  * set debug-file-directory <directory> - set directory contain symbol file
 +  * show debug-file-directory
  
 ==== file paths and libraries ==== ==== file paths and libraries ====
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   * set sysroot /home/niziak/n/3/out/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot   * set sysroot /home/niziak/n/3/out/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot
  
-=== source paths ===+==== source paths ====
 Search paths (prefixes): Search paths (prefixes):
   * dir /path/to/src1   * dir /path/to/src1
Line 49: Line 170:
   * set substitute-path /usr/lib ../../out/target/usr/lib   * set substitute-path /usr/lib ../../out/target/usr/lib
  
-==== infos ==== 
-  * show debug-file-directory 
- 
-==== threads ==== 
-  * info threads - show info about threads 
-  * thread 4 - switch to thread 4 
-  * print mutex 
  
-==== Kernel OOPS ====+====== Kernel OOPS ======
 === Reading === === Reading ===
 <code> <code>
Line 74: Line 188:
 and look into generated code. and look into generated code.
  
-==== Python ====+====== Python ====== 
 <code bash>apt-get install gdb python2.7-dbg</code> <code bash>apt-get install gdb python2.7-dbg</code>
 <code bash>gdb python <pid></code> <code bash>gdb python <pid></code>
  
-===== DRAFTS =====+ 
 +====== DRAFTS ======
 call raise(kernel-thread-id, signo) or call pthread_kill(pthread-thread-id, signo). call raise(kernel-thread-id, signo) or call pthread_kill(pthread-thread-id, signo).