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| -rw-r--r-- | md/writeup/using_gdb.md | 65 |
1 files changed, 58 insertions, 7 deletions
diff --git a/md/writeup/using_gdb.md b/md/writeup/using_gdb.md index ab27272..75e0bf3 100644 --- a/md/writeup/using_gdb.md +++ b/md/writeup/using_gdb.md @@ -1,5 +1,6 @@ title: Using GDB keywords:gdb,debug,linux + # Using GDB GDB is gnu debugger that excists for years and it work on any linux/bsd @@ -20,24 +21,53 @@ more stuff will added gdb [PROGRAM] ``` + +Run program + ``` (gdb) run [CMD LINE PARAMS TO PROGRAM] ``` +Load ELD fileas with stuff and symbols + +```bash +load file.elf +file file.elf +``` + +### + ## Setting breakpoints -Setting breakpoint on speific address +### Speific address ```bash (gdb) break *0x800000 ``` -on specific function +### Function ```bash (gdb) break _start ``` +### Source line + +```bash +(gdb) break src/main.c:12 +``` + +###List breakpoints + +```bash +(gdb) info b +``` + +##Delete breakpoints +```bash +(gdb) clear src/main.c:12 +``` + Here is more breakpoint types [Link1](http://ftp.gnu.org/old-gnu/Manuals/gdb/html_node/gdb_28.html) and [Link2](http://www.unknownroad.com/rtfm/gdbtut/gdbbreak.html) ## Print registers @@ -62,29 +92,50 @@ print value in hex ## Print memory -print one byte in specific adress +### Byte +print one byte from specific adress ```bash (gdb) x/u *0x808080 ``` -print array of 16 bytes in hex +### Array + +print 16 bytes in hex ```bash -gdb) x/16xu *0xffffd310 +(gdb) x/16xu *0xffffd310 ``` +print from pointer value array -from register value +```bash +(gdb) print/x *array_var@123 +``` + +### Register value ```bash (gdb) x/4xb $ebp-0xc ``` -## Print current position instruction +### Print current position instruction ```bash (gdb) x/i $pc ``` +### Structure + +turn on more nicer structure otutput + +```bash +set print pretty on +``` + +```bash +(gdb) ptype SPI_HandleTypeDef +``` + + ## Step ```bash |