Re: ARM/linux gdb stops and gives no info

[Richard Earnshaw <rearnsha at arm dot com>]

> > > > I can understand not being able to unpick the stack frame if I've jumped
> > > > to never-never land, but to not even be able to display the registers
> > > > makes the debugger useless.
[...]
> Peter Schauer added the test for NULL frames in there back in 1995.  I believe
> it was causing core dumps, but I am not sure as the ChangeLog entry does not give
> the motive (we nowadays make sure it does, but that was not always true at the time):
> 
>      * infcmd.c (registers_info):  Error out if selected_frame is NULL.
> 
> I believe the default gdb routine (if the target does not define DO_REGISTERS_INFO)
> does not depend on selected_frame but I can't be sure about all targets.
> 
> I quickly created the patch below.  I have no time to test it these days.
> If you care applying it to your sources and trying I would appreciate.
> Otherwise it goes in my 25 pages long TODO list.. ;-)


Sadly, gdb won't even compile at the moment.

gcc -c -g -O2    -I. -I/net/home/rearnsha/gnusrc/utils/gdb 
-I/net/home/rearnsha/gnusrc/utils/gdb/config -DHAVE_CONFIG_H 
-I/net/home/rearnsha/gnusrc/utils/gdb/../include/opcode 
-I/net/home/rearnsha/gnusrc/utils/gdb/../readline/.. -I../bfd 
-I/net/home/rearnsha/gnusrc/utils/gdb/../bfd  -I/net/home/rearnsha/gnusrc/u
tils/gdb/../include -I../intl -I/net/home/rearnsha/gnusrc/utils/gdb/../intl
  -Wimplicit -Wreturn-type -Wcomment -Wtrigraphs -Wformat -Wparentheses 
-Wpointer-arith -Wuninitialized  /net/home/rearnsha/gnusrc/utils/gdb/core-r
egset.c
In file included from /net/home/rearnsha/gnusrc/utils/gdb/config/tm-linux.h
:36,
                 from tm.h:27,
                 from /net/home/rearnsha/gnusrc/utils/gdb/defs.h:719,
                 from /net/home/rearnsha/gnusrc/utils/gdb/core-regset.c:36:
/net/home/rearnsha/gnusrc/utils/gdb/config/tm-sysv4.h:30: warning: 
`IN_SOLIB_CALL_TRAMPOLINE' redefined
/net/home/rearnsha/gnusrc/utils/gdb/config/arm/tm-arm.h:517: warning: this 
is the location of the previous definition
/net/home/rearnsha/gnusrc/utils/gdb/config/tm-sysv4.h:36: warning: 
`SKIP_TRAMPOLINE_CODE' redefined
/net/home/rearnsha/gnusrc/utils/gdb/config/arm/tm-arm.h:518: warning: this 
is the location of the previous definition
In file included from /net/home/rearnsha/gnusrc/utils/gdb/core-regset.c:52:
/net/home/rearnsha/gnusrc/utils/gdb/gregset.h:29: parse error before 
`gdb_gregset_t'

gdb/config/nm-linux.h contains the defines

#define GDB_GREGSET_T  elf_gregset_t
#define GDB_FPREGSET_T elf_fpregset_t

But elf_gregset_t is defined in linux/elfcore.h, and nothing includes that 
file :-)

My machine is armv4l-unknown-linux-gnuoldld if that makes any differnce.

R.

Scott,

/usr/include/sys/procfs.h contains an include of sys/elf.h, but this file 
doesn't exist.  Should it be the same as /usr/include/elf.h?