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Implement 'set dump-excluded-mappings' command 

Commit df8411da08 implemented support for
checking /proc/PID/coredump_filter, and also changed gcore behavior to
unconditionally honor the VM_DONTDUMP flag, preventing sections marked
as such for being dumped into the core file.

This patch implements the 'set dump-excluded-mappings' command for
instructing gdb to ignore the VM_DONTDUMP flag. Combined with 'set
use-coredump-filter', this allows the user to restore the old behavior,
dumping all sections (except the ones marked as IO) unconditionally.

gdb/Changelog:
2017-11-29  Sergio Lopez  <slp@redhat.com>

	* linux-tdep.c (dump_excluded_mappings): New variable.
	(dump_mapping_p): Use dump_excluded_mappings variable.
	(_initialize_linux_tdep): New command 'set dump_excluded_mappings'.
This commit is contained in:
Sergio Lopez 2017-12-04 09:17:12 +01:00 committed by Sergio Durigan Junior
parent 7403715e30
commit afa840dcc0
1 changed files with 29 additions and 1 deletions
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30
gdb/linux-tdep.c
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@ -93,6 +93,11 @@ struct smaps_vmflags
static int use_coredump_filter = 1;
/* Whether the value of smaps_vmflags->exclude_coredump should be
ignored, including mappings marked with the VM_DONTDUMP flag in
the dump. */
static int dump_excluded_mappings = 0;
/* This enum represents the signals' numbers on a generic architecture
running the Linux kernel. The definition of "generic" comes from
the file <include/uapi/asm-generic/signal.h>, from the Linux kernel
@ -655,7 +660,7 @@ dump_mapping_p (filter_flags filterflags, const struct smaps_vmflags *v,
return 0;
/* Check if we should exclude this mapping. */
if (v->exclude_coredump)
if (!dump_excluded_mappings && v->exclude_coredump)
return 0;
/* Update our notion of whether this mapping is shared or
@ -2469,6 +2474,17 @@ show_use_coredump_filter (struct ui_file *file, int from_tty,
" corefiles is %s.\n"), value);
}
/* Display whether the gcore command is dumping mappings marked with
the VM_DONTDUMP flag. */
static void
show_dump_excluded_mappings (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Dumping of mappings marked with the VM_DONTDUMP"
" flag is %s.\n"), value);
}
/* To be called from the various GDB_OSABI_LINUX handlers for the
various GNU/Linux architectures and machine types. */
@ -2517,4 +2533,16 @@ of /proc/PID/coredump_filter when generating the corefile. For more information
about this file, refer to the manpage of core(5)."),
NULL, show_use_coredump_filter,
&setlist, &showlist);
add_setshow_boolean_cmd ("dump-excluded-mappings", class_files,
&dump_excluded_mappings, _("\
Set whether gcore should dump mappings marked with the VM_DONTDUMP flag."),
_("\
Show whether gcore should dump mappings marked with the VM_DONTDUMP flag."),
_("\
Use this command to set whether gcore should dump mappings marked with the\n\
VM_DONTDUMP flag (\"dd\" in /proc/PID/smaps) when generating the corefile. For\n\
more information about this file, refer to the manpage of proc(5) and core(5)."),
NULL, show_dump_excluded_mappings,
&setlist, &showlist);
}