binutils-gdb/gdb/testsuite/gdb.base/vdso-warning.c

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PR symtab/14466: Work around PR libc/13097 "linux-vdso.so.1" With upstream glibc, GDB prints: warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? A bug's been filed for glibc a few years back: http://sourceware.org/bugzilla/show_bug.cgi?id=13097 but it's still not resolved. It's not clear whether there's even consensus that this is indeed a glibc bug. It would actually be nice if GDB also listed the vDSO in the shared library list, but there are some design considerations with that: - the vDSO is mapped by the kernel, not userspace, therefore we should load its symbols right from the process's start of life, even before glibc / the userspace loader sets up the initial DSO list. The program might even be using a custom loader or no loader. - that kind of hints at that solib.c should handle retrieving shared library lists from more than one source, and that symfile-mem.c's loading of the vDSO would be converted to load and relocate the vDSO's bfd behind the target_so_ops interface. - and then, once glibc links in the vDSO to its DSO list, we'd need to either: a) somehow hand over the vDSO from one target_so_ops to the other b) simply keep hiding glibc's entry. And then b) seems the simplest. With that in mind, this patch simply discards the vDSO from glibc's reported shared library list. We can match the vDSO address range with the addresses found iterating the dynamic linker list, to tell which dynamic linker entry is the vDSO. Tested on x86_64 Fedora 20. gdb/ 2014-10-10 Jan Kratochvil <jan.kratochvil@redhat.com> Pedro Alves <palves@redhat.com> PR symtab/14466 * solib-svr4.c (svr4_read_so_list): Rename to ... (svr4_current_sos_1): ... this and change the function comment. (svr4_current_sos): New function. gdb/testsuite/ 2014-10-10 Jan Kratochvil <jan.kratochvil@redhat.com> Pedro Alves <palves@redhat.com> PR symtab/14466 * gdb.base/vdso-warning.c: New file. * gdb.base/vdso-warning.exp: New file.
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/* This testcase is part of GDB, the GNU debugger.
Copyright 2014-2022 Free Software Foundation, Inc.
PR symtab/14466: Work around PR libc/13097 "linux-vdso.so.1" With upstream glibc, GDB prints: warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? A bug's been filed for glibc a few years back: http://sourceware.org/bugzilla/show_bug.cgi?id=13097 but it's still not resolved. It's not clear whether there's even consensus that this is indeed a glibc bug. It would actually be nice if GDB also listed the vDSO in the shared library list, but there are some design considerations with that: - the vDSO is mapped by the kernel, not userspace, therefore we should load its symbols right from the process's start of life, even before glibc / the userspace loader sets up the initial DSO list. The program might even be using a custom loader or no loader. - that kind of hints at that solib.c should handle retrieving shared library lists from more than one source, and that symfile-mem.c's loading of the vDSO would be converted to load and relocate the vDSO's bfd behind the target_so_ops interface. - and then, once glibc links in the vDSO to its DSO list, we'd need to either: a) somehow hand over the vDSO from one target_so_ops to the other b) simply keep hiding glibc's entry. And then b) seems the simplest. With that in mind, this patch simply discards the vDSO from glibc's reported shared library list. We can match the vDSO address range with the addresses found iterating the dynamic linker list, to tell which dynamic linker entry is the vDSO. Tested on x86_64 Fedora 20. gdb/ 2014-10-10 Jan Kratochvil <jan.kratochvil@redhat.com> Pedro Alves <palves@redhat.com> PR symtab/14466 * solib-svr4.c (svr4_read_so_list): Rename to ... (svr4_current_sos_1): ... this and change the function comment. (svr4_current_sos): New function. gdb/testsuite/ 2014-10-10 Jan Kratochvil <jan.kratochvil@redhat.com> Pedro Alves <palves@redhat.com> PR symtab/14466 * gdb.base/vdso-warning.c: New file. * gdb.base/vdso-warning.exp: New file.
2014-10-10 22:57:13 +08:00
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
int
main (void)
{
return 0;
}