Re: Elfutils segfault on IA64

[Patrick Baggett <baggett.patrick@gmail.com>]

I set the breakpoint, and it is called as you expected:

(gdb) bt

#0  ppc_register_info (ebl=0x6000000000004120, regno=-1, name=0x0, namelen=0, prefix=0x0, setname=0x0, bits=0x0, type=0x0) at ppc_regs.c:45

#1  0x20000000000ba2c0 in ebl_register_info (ebl=0x6000000000004120, regno=-1, name=0x0, namelen=0, prefix=0x0, setname=0x0, bits=0x0, type=0x0) at eblreginfo.c:48

#2  0x20000000000a4f10 in dwfl_module_register_names (mod=0x60000000000062d0, func=@0x4000000000003170: 0x4000000000001880 <print_register>, arg=0x60000fffffffb3a0) at dwfl_module_register_names.c:53

#3  0x4000000000001bd0 in handle_cfi (stuff=0x60000fffffffb3a0, pc=268436672, which=0x4000000000002318 ".debug_frame", dwfl=0x60000000000042f0, cfi=<optimized out>) at addrcfi.c:153

#4  handle_cfi (dwfl=0x60000000000042f0, which=0x4000000000002318 ".debug_frame", cfi=0x6000000000007420, pc=268436672, stuff=0x60000fffffffb3a0) at addrcfi.c:107

#5  0x4000000000001f50 in handle_address (pc=268436672, dwfl=0x60000000000042f0) at addrcfi.c:167

#6  0x40000000000010b0 in main (argc=4, argv=0x60000fffffffb678) at addrcfi.c:216

Also in addrcfi.c, the `bits` and `type` fields are marked with __attribute__((unused)), so it may not be so crazy:

static int

print_register (void *arg,

                int regno,

                const char *setname,

                const char *prefix,

                const char *regname,

                int bits __attribute__ ((unused)),

                int type __attribute__ ((unused)))

{

On Wed, Oct 2, 2013 at 1:34 PM, Kurt Roeckx <kurt@roeckx.be> wrote:

On Wed, Oct 02, 2013 at 01:12:44PM -0500, Patrick Baggett wrote:
> OK, here's what I get when I run that test in GDB:
>
> Program received signal SIGSEGV, Segmentation fault.
> dwarf_frame_register (fs=0x600000000000be00, regno=<optimized out>,
>     ops_mem=0x60000fffffffb2d0, ops=0x60000fffffffb2c8,
>     nops=0x60000fffffffb2c0) at dwarf_frame_register.c:105
> 105             get_uleb128 (block.length, p);
> (gdb) bt
> #0  dwarf_frame_register (fs=0x600000000000be00, regno=<optimized out>,
>     ops_mem=0x60000fffffffb2d0, ops=0x60000fffffffb2c8,
>     nops=0x60000fffffffb2c0) at dwarf_frame_register.c:105
> #1  0x4000000000001900 in print_register (arg=<optimized out>, regno=1,
>     setname=0x20000000004c9b18 "integer", prefix=0x20000000004c8890 "",
>     regname=0x60000fffffffb328 "r1", bits=-19768, type=675872) at
> addrcfi.c:100

This bits=-19768 clearly looks wrong.  I would guess that should
say 32.

The type really should also be DW_ATE_signed (5).

Can you set a breakpoint in ppc_register_info?
dwfl_module_register_names should be calling that
hook.


Kurt