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[Bug gdb/15121] x/a broken for addresses in shared libraries
- From: "ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Sat, 05 Sep 2015 17:55:16 +0000
- Subject: [Bug gdb/15121] x/a broken for addresses in shared libraries
- Auto-submitted: auto-generated
- References: <bug-15121-4717 at http dot sourceware dot org/bugzilla/>
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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