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This page was last modified 2009-12-15 19:13:27 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,
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origial work that cannot be use for personal or commercial purposes.
Please respect the work of original authors.
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