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This page was last modified 2009-12-15 21:13:27 by Puchu.Net user Choco. (Show history)
Flow Control
n
| execute next function
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s
| step into function
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si
| step instruction
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fin
| step out of function
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c
| continue
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run ?
| start running program with arguments
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bt
| print backtrace of stack frames
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frame ?/up/down
| switch stack frames
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thread ?
| inspect specified thread
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Breakpoint
break ?
| set breakpoint
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dis break ?
| disable breakpoint
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enable break ?
| enable disabled breakpoint
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info break
| list breakpoints
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delete break ?
| delete breakpoint
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set value 0xd to a memory address replaces the instruction with a breakpoint.
Watch/Examine Variables
p ?
| print value of variable
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whatis ?
| show type of variable
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ptype ?
| print variable structure
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set print pretty on
| print variables one per line, easier to read
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display ?
| print value of variable automatically when a breakpoint is hit
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dis display ?
| disable watching variable
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enable display ?
| enable disabled variable watching
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info display
| list variables being watched
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delete display ?
| delete watched variable
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x/? ?
| dump specified amount of memory at address
(gdb) x/16x 0xbfbf06ac
0xbfbf06ac: 0x08496b13 0x0963e848 0x00000000 0x088d5dcf
0xbfbf06bc: 0x0000008f 0x088d5d0c 0x088d5dcf 0x088b4401
0xbfbf06cc: 0x088d5d0c 0x097b5e38 0x082716b0 0xb34d94f8
0xbfbf06dc: 0xb7c1d3e1 0xbfbf0718 0xb7c214f0 0xb7cfe160 |
info reg
| dump register values
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disas ? ?
| disassembles between address ranges
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Other commands that may be useful: info args, info frame, info local, and info threads.
Access Memory
mem ? ? ro 32
| define read-only memory region between two addresses using 32-bit memory access
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dis mem ?
| disable memory region
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enable mem ?
| enable disabled memory region
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info mem
| list defined memory regions
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delete mem ?
| delete defined memory region
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dump ihex filename ? ?
| dump memory to file in Intel hex format
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dump binary filename ?
| dump expression to file in binary format
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Notes
- To ignore SIGPIPE:
handle SIGPIPE nostop noprint pass.
- Remote debugging by executing
gdbserver x.x.x.x:xxxx ..., and connect with command target remote x.x.x.x:xxxx. Since program is already running, use continue instead of run.
- If library symbols are missing, use
set solib-search-path ... or set solib-absolute-prefix ... to load symbols from target.
- If backtrace isn't going back as far as you like, try
set heuristic-fence-post 100000.
- Older versions of gdb is useless when debugging multi-threaded application. 6.8 seems to work well?
References
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Document is accessible from
http://www.puchu.net.
© 2002-2010 Sean Yang, Karen Yang, Don Yang and/or respective authors,
all rights reserverd.
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work of other authors from the internet,
links that refer to other web documents and resources, or
origial work that cannot be use for personal or commercial purposes.
Please respect the work of original authors.
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