Date: Wed, 11 Dec 1996 15:34:07 -0600 (CST) From: Lars Jonas Olsson <jonas@mcs.net> To: current@freebsd.org Cc: jonas@mcs.net Subject: remote gdb Message-ID: <199612112134.PAA04909@Mercury.mcs.net>
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I'm debugging dga related (mprotect) related panics in cuyrrent. I'm doing it
with remote gdb like:
Have options DDB in config file SMARTDEBUG
config -g SMARTDEBUG
make the kernel
cp kernel kernel.debug
strip -d kernel
install kernel on machine that panics.
install kernel.debug on remote machine
Boot machine to be debugged with -g
start gdb on other machine in directory with kernel.debug in it.
amcell1# gdb kernel.debug
GDB is free software and you are welcome to distribute copies of it
under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.13 (i386-unknown-freebsd),
Copyright 1994 Free Software Foundation, Inc...
(gdb) target remote /dev/cuaa1
Remote debugging using /dev/cuaa1
pmap_protect (pmap=0xf2357864, sva=135467008, eva=139661312, prot=1)
at ../../i386/i386/pmap.c:1874
../../i386/i386/pmap.c:1874: No such file or directory.
(gdb) dir /amcell2/new/src/sys/compile/SMARTDEBUG
Source directories searched: /amcell2/new/src/sys/compile/SMARTDEBUG:$cdir:$cwd
(gdb) bt
#0 pmap_protect (pmap=0xf2357864, sva=135467008, eva=139661312, prot=1)
at ../../i386/i386/pmap.c:1874
#1 0xf01a396e in vm_map_protect (map=0xf2357800, start=135467008,
end=139661312, new_prot=1 '\001', set_max=0) at ../../vm/vm_map.c:1201
#2 0xf01a566e in mprotect (p=0xf234a200, uap=0xefbfff94, retval=0xefbfff84)
at ../../vm/vm_mmap.c:484
#3 0xf01bc72b in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = 24576,
tf_esi = 0, tf_ebp = -272640728, tf_isp = -272629788, tf_ebx = 0,
tf_edx = -272641536, tf_ecx = -272641536, tf_eax = 74, tf_trapno = 12,
tf_err = 7, tf_eip = 135115361, tf_cs = 31, tf_eflags = 642,
tf_esp = -272640756, tf_ss = 39}) at ../../i386/i386/trap.c:891
#4 0xf01b4155 in Xsyscall ()
#5 0x1e7a in ?? ()
#6 0x1095 in ?? ()
(gdb) list
1869 if (pbits & PG_RW) {
1870 if (pbits & PG_M) {
1871 vm_offset_t sva = i386_ptob(sindex);
1872 if (pmap_track_modified(sva)) {
1873 vm_page_t m = PHYS_TO_VM_PAGE(pbits);
1874 m->dirty = VM_PAGE_BITS_ALL;
1875 }
1876 }
1877 ptbase[sindex] = pbits & ~(PG_M|PG_RW);
1878 anychanged = 1;
Now how do I shutdown the system nicely? (as nicely as possible?)
Jonas
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