gdb with hex values

[John J. Boyer]

I discovered that gdb has list of commands available through the help 
command. After starting gdb I can type

set output-radix 16

John

On Fri, Jul 05, 2013 at 04:50:41PM +0300, Shlomi Fish wrote:
> Hi John,
> 
> On Thu, 4 Jul 2013 23:49:37 -0500
> "John J. Boyer" <john.boyer at abilitiessoft.com> wrote:
> 
> > 
> > Is it possible to tell gdb to show the values of variables in 
> > hexadecimal rather than decimal? I can't find anything on the man page.
> > 
> 
> Use the /x option:
> 
> [SHELL]
> shlomif[fcs]:$trunk/fc-solve/source/B$ gdb ./fc-solve
> GNU gdb (GDB) 7.6-4.mga4 (Mageia release 4)
> Copyright (C) 2013 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 "x86_64-mageia-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols
> from /home/shlomif/progs/freecell/git/fc-solve/fc-solve/source/B/fc-solve...done.
> (gdb) p 100
> $1 = 100
> (gdb) p /x 100
> $2 = 0x64
> (gdb) help p
> Print value of expression EXP.
> Variables accessible are those of the lexical environment of the selected
> stack frame, plus all those whose scope is global or an entire file.
> 
> $NUM gets previous value number NUM.  $ and $$ are the last two values.
> $$NUM refers to NUM'th value back from the last one.
> Names starting with $ refer to registers (with the values they would have
> if the program were to return to the stack frame now selected, restoring
> all registers saved by frames farther in) or else to debugger
> "convenience" variables (any such name not a known register).
> Use assignment expressions to give values to convenience variables.
> 
> {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.
> @ is a binary operator for treating consecutive data objects
> anywhere in memory as an array.  FOO at NUM gives an array whose first
> element is FOO, whose second element is stored in the space following
> where FOO is stored, etc.  FOO must be an expression whose value
> resides in memory.
> 
> EXP may be preceded with /FMT, where FMT is a format letter
> but no count or size letter (see "x" command).
> (gdb) 
> [/SHELL]
> 
> You can find more information about using gdb from its online manual:
> 
> http://www.gnu.org/software/gdb/documentation/
> 
> And from these resources:
> 
> * http://tel.foss.org.il/advanced.html (search for the "Advanced GDB" row).
> 
> * http://www.haifux.org/lectures/210/ (and
> http://www.mail-archive.com/haifux@haifux.org/msg03722.html )
> 
> Hope it helps.
> 
> Regards,
> 
> 	Shlomi Fish
> 
> -- 
> -----------------------------------------------------------------
> Shlomi Fish       http://www.shlomifish.org/
> Understand what Open Source is - http://shlom.in/oss-fs
> 
> <rindolf>  If you repeat a scene 50k times, then the movie will have less
> entropy and will compress better. ( irc://irc.freenode.org/#perlcafe )
> 
> Please reply to list if it's a mailing list post - http://shlom.in/reply .
> 
> _______________________________________________
> Blinux-list mailing list
> Blinux-list at redhat.com
> https://www.redhat.com/mailman/listinfo/blinux-list

-- 
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities