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compare-sections: New -r option.

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When connecting to a remote system, we use the compare-sections
command to verify that the box is running the code that we think it is
running.  Since the system is up and running and *NOT* 'freshly
downloaded without yet executing anything', read-write sections, of
course, differ from what they were in the executable file.

Comparing read-write sections takes time and more importantly the
MIS-MATCHED output is confusing to some users.

The compare-sections command compares all loadable sections including
read-write sections.  This patch gives the user the option to compare
just the loadable read-only sections.

gdb/
2014-05-01  David Taylor  <dtaylor@emc.com>

	* remote.c (compare_sections_command): Add -r option to compare
	all loadable read-only sections.

gdb/doc/
2014-05-01  David Taylor  <dtaylor@emc.com>

	* gdb.texinfo (compare-sections): Document the new -r (read-only)
	option.
This commit is contained in:
David Taylor 2014-05-01 18:09:43 +01:00 committed by Pedro Alves
parent 86a80a50f2
commit 95cf3b38cd
4 changed files with 25 additions and 3 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2014-05-01 David Taylor <dtaylor@emc.com>
* remote.c (compare_sections_command): Add -r option to compare
all loadable read-only sections.
2014-04-30 Siva Chandra Reddy <sivachandra@google.com>
* dwarf2loc.c (dwarf2_locexpr_baton_eval,

5
gdb/doc/ChangeLog
View File

@ -1,3 +1,8 @@
2014-05-01 David Taylor <dtaylor@emc.com>
* gdb.texinfo (compare-sections): Document the new -r (read-only)
option.
2014-04-24 Michael Sturm <michael.sturm@mintel.com>
Walfred Tedeschi <walfred.tedeschi@intel.com>

5
gdb/doc/gdb.texinfo
View File

@ -8772,11 +8772,12 @@ situations.
@table @code
@kindex compare-sections
@item compare-sections @r{[}@var{section-name}@r{]}
@item compare-sections @r{[}@var{section-name}@r{|}@code{-r}@r{]}
Compare the data of a loadable section @var{section-name} in the
executable file of the program being debugged with the same section in
the remote machine's memory, and report any mismatches. With no
arguments, compares all loadable sections. This command's
arguments, compares all loadable sections. With an argument of
@code{-r}, compares all loadable read-only sections. This command's
availability depends on the target's support for the @code{"qCRC"}
remote request.
@end table

13
gdb/remote.c
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@ -8484,6 +8484,7 @@ compare_sections_command (char *args, int from_tty)
int matched = 0;
int mismatched = 0;
int res;
int read_only = 0;
if (!exec_bfd)
error (_("command cannot be used without an exec file"));
@ -8491,11 +8492,20 @@ compare_sections_command (char *args, int from_tty)
/* Make sure the remote is pointing at the right process. */
set_general_process ();
if (args != NULL && strcmp (args, "-r") == 0)
{
read_only = 1;
args = NULL;
}
for (s = exec_bfd->sections; s; s = s->next)
{
if (!(s->flags & SEC_LOAD))
continue; /* Skip non-loadable section. */
if (read_only && (s->flags & SEC_READONLY) == 0)
continue; /* Skip writeable sections */
size = bfd_get_section_size (s);
if (size == 0)
continue; /* Skip zero-length section. */
@ -11771,7 +11781,8 @@ the packets being used"),
add_cmd ("compare-sections", class_obscure, compare_sections_command, _("\
Compare section data on target to the exec file.\n\
Argument is a single section name (default: all loaded sections)."),
Argument is a single section name (default: all loaded sections).\n\
To compare only read-only loaded sections, specify the -r option."),
&cmdlist);
add_cmd ("packet", class_maintenance, packet_command, _("\