[Bug gdb/15121] x/a broken for addresses in shared libraries

["ppluzhnikov at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15121

Paul Pluzhnikov <ppluzhnikov at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |ppluzhnikov at google dot com

--- Comment #1 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
The problem only happens when a 64-bit GDB is debugging 32-bit program (which
is probably why this hasn't been bothering everyone else for the last 5 years).

The problem is that unpack_pointer() sign-extends the returned value from
0xf7fd65e6 to 0xfffffffff7fd65e6 here:

#0  unpack_pointer (type=0xf4dea0, valaddr=0xfb0ea0 "\370\323\377\377") at
../../gdb/value.c:2931
#1  0x00000000005de455 in print_scalar_formatted (valaddr=0xfb0ea0,
type=0xf4dea0, options=0x7fffffffdc00, size=119, stream=0xefd6a0) at
../../gdb/printcmd.c:445
#2  0x00000000005d9b09 in val_print_scalar_formatted (type=0xf4dea0,
valaddr=0xfb0ea0 "\370\323\377\377", embedded_offset=0, val=0xf80570,
options=0x7fffffffdc00, size=119, stream=0xefd6a0) at ../../gdb/valprint.c:1205
#3  0x00000000005ddf4e in print_formatted (val=0xf80570, size=119,
options=0x7fffffffdc00, stream=0xefd6a0) at ../../gdb/printcmd.c:319
#4  0x00000000005df280 in do_examine (fmt=..., gdbarch=0xf49eb0,
addr=4294956008) at ../../gdb/printcmd.c:907
#5  0x00000000005e0a2c in x_command (exp=0xd5f195 "", from_tty=1) at
../../gdb/printcmd.c:1467

Subsequent find_pc_section() calls on 0xfffffffff7fd65e6 fail (naturally).

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