This patch extends/rewrites the gdb.base/gnu-ifunc.exp testcase to
cover the many different fixes in earlier patches. (This was actually
what encovered most of the problems.)
The current testcase uses an ifunc symbol with the same name as the
ifunc resolver symbol and makes sure to compile the ifunc resolver
without debug info. That does not model how ifuncs are implemented in
gcc/ifunc nowadays. Instead, what we have is that the glibc ifunc
resolvers nowadays are written in C and end up with debug info.
Also, in some cases the ifunc target is written in assembly, but in
other cases it's written in C. In the case of target function written
in C, if the target function has debug info, when we set a break on
the ifunc, we want to set it past the prologue of the target function.
Currently GDB gets that wrong.
To make sure we cover all the different scenarios, the testcase is
tweaked to cover all the different combinations of
- An ifunc resolver with the same name as the user-visible symbol vs
an ifunc resolver with a different name as the user-visible symbol.
- ifunc resolver compiled with and without debug info.
- ifunc target function compiled with and without debug info.
The testcase currently sets breakpoints on ifuncs, calls ifunc
functions, steps into ifunc functions, etc. After this series, this
all works and the testcase passes cleanly.
While working on this, I noticed that "b gnu_ifunc" before and after
the inferior resolved the ifunc would end up with a breakpoint with
different locations. That's now covered by new tests inside the new
"set-break" procedure.
It also tests other things like making sure we can't call an ifunc
without a return-type case if we don't know the type of the target.
And making sure that we pass enough arguments when we do know the
type.
gdb/testsuite/ChangeLog:
2018-04-26 Pedro Alves <palves@redhat.com>
* gdb.base/gnu-ifunc-final.c: New file.
* gdb.base/gnu-ifunc.c (final): Delete, moved to gnu-ifunc-final.c.
* gdb.base/gnu-ifunc.exp (executable): Delete.
(staticexecutable): Adjust.
(lib_opts, exec_opts): Delete.
(make_binsuffix, build, set-break): New procedures.
(misc_tests): New, with tests factored out from the top level.
(top level): Test different combinations of ifunc resolver name,
resolver with and with debug info, and ifunc target with and
without debug info. Wrap static tests with with_target_prefix.
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.
gdb/ChangeLog:
Update copyright year range in all GDB files.
On various GNU Elf architectures, including AArch64, ARM, s390/s390x,
ppc32/64, and sparc32/64, the dynamic loader passes HWCAP as a parameter
to each ifunc resolver. Currently there is an open glibc Bugzilla that
requests this to be generalized to all architectures:
https://sourceware.org/bugzilla/show_bug.cgi?id=19766
And various ifunc resolvers already rely on receiving HWCAP. Currently
GDB always calls an ifunc resolver without any arguments; thus the
resolver may receive garbage, and based on that, the resolver may decide
to return a function that is not suited for the given platform.
This patch always passes HWCAP to ifunc resolvers, even on systems where
the dynamic loader currently behaves otherwise. The rationale is
that (1) the dynamic loader may get adjusted on those systems as well in
the future; (2) passing an unused argument should not cause a problem
with existing resolvers; and (3) the logic is much simpler without such
a distinction.
gdb/ChangeLog:
* elfread.c (auxv.h): New include.
(elf_gnu_ifunc_resolve_addr): Pass HWCAP to ifunc resolver.
gdb/testsuite/ChangeLog:
* gdb.base/gnu-ifunc-lib.c (resolver_hwcap): New external
variable declaration.
(gnu_ifunc): Add parameter hwcap. Store it in resolver_hwcap.
* gdb.base/gnu-ifunc.c (resolver_hwcap): New global variable.
* gdb.base/gnu-ifunc.exp: Add test to verify that the resolver
received HWCAP as its argument.
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
Pedro Alves
Joel Brobecker
Andreas Arnez
Joel Brobecker
Jan Kratochvil