On Sun, Aug 2, 2009 at 2:00 AM, Robert P. J. Day<rpjday@xxxxxxxxxxxxxx> wrote: > > for an upcoming column on how to debug the kernel (and modules) with > gdb, i'm showing how to use the above and, since it's been a while, i > need a refresher. > > once i'm in gdb, i can list the section breakdown of the vmlinux > file with: > > (gdb) info files > ... > Local exec file: > `/home/rpjday/k/f11/vmlinux', file type elf64-x86-64. > Entry point: 0x1000000 > 0xffffffff81000000 - 0xffffffff81009000 is .text.head > 0xffffffff81009000 - 0xffffffff813f2d3f is .text > 0xffffffff813f2d40 - 0xffffffff813f2ebc is .notes > 0xffffffff813f2ec0 - 0xffffffff813f6f80 is __ex_table > 0xffffffff813f7000 - 0xffffffff8158e10a is .rodata > 0xffffffff8158e110 - 0xffffffff8159417c is __bug_table > 0xffffffff81594180 - 0xffffffff81595810 is .pci_fixup > 0xffffffff81595810 - 0xffffffff81595838 is .tracedata > 0xffffffff81595840 - 0xffffffff815a26c0 is __ksymtab > 0xffffffff815a26c0 - 0xffffffff815a91d0 is __ksymtab_gpl > 0xffffffff815a91d0 - 0xffffffff815a91e0 is __ksymtab_unused > 0xffffffff815a91e0 - 0xffffffff815bf743 is __ksymtab_strings > 0xffffffff815bf750 - 0xffffffff815eacd0 is __init_rodata > 0xffffffff815eacd0 - 0xffffffff815ed000 is __param > 0xffffffff815ed000 - 0xffffffff8165ae60 is .data > ... and so on. > > if i try to list the variables (obviously a looooong list) with > > (gdb) info variables > > gdb just goes away (perhaps I'm just asking for too much?). is there > a way to ask for the variable/symbol list within a single section? i > don't see the gdb command for that. > > also (and a simpler question), as an example of how to print kernel > variables once you're in gdb, i always start with one of: > > (gdb) p jiffies > (gdb) p jiffies_64 > > depending on your architecture. are there some other kernel vars that > are informative and obvious to print? there's loops_per_jiffy as > well, but off the top of peoples' heads, given the stunning number of > possible kernel variables to print, which ones would be good examples > that would be meaningful for a newbie column? how about "p current" ?? Thanks - Manish > thanks. > > rday > -- > > ======================================================================== > Robert P. J. Day Waterloo, Ontario, CANADA > > Linux Consulting, Training and Annoying Kernel Pedantry. > > Web page: http://crashcourse.ca > Twitter: http://twitter.com/rpjday > "Kernel Newbie Corner" column @ linux.com: http://cli.gs/WG6WYX > ======================================================================== > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Thanks - Manish -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
