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Pedro Alves 906d60cf46 PR13858 - Can't do displaced stepping with no symbols
Running break-interp.exp with the target always in non-stop mode trips
on PR13858, as enabling non-stop also enables displaced stepping.

The problem is that when GDB doesn't know where the entry point is, it
doesn't know where to put the displaced stepping scratch pad.  The
test added by this commit exercises this.  Without the fix, we get:

 (gdb) PASS: gdb.base/step-over-no-symbols.exp: displaced=on: break *$pc
 set displaced-stepping on
 (gdb) PASS: gdb.base/step-over-no-symbols.exp: displaced=on: set displaced-stepping on
 stepi
 0x00000000004005be in ?? ()
 Entry point address is not known.
 (gdb) PASS: gdb.base/step-over-no-symbols.exp: displaced=on: stepi
 p /x $pc
 $2 = 0x4005be
 (gdb) PASS: gdb.base/step-over-no-symbols.exp: displaced=on: get after PC
 FAIL: gdb.base/step-over-no-symbols.exp: displaced=on: advanced

The fix switches all GNU/Linux ports to get the entry point from
AT_ENTRY in the target auxiliary vector instead of from symbols.  This
is currently only done by PPC when Cell debugging is enabled, but I
think all archs should be able to do the same.  Note that
ppc_linux_displaced_step_location cached the result, I'm guessing to
avoid constantly re-fetching the auxv out of remote targets, but
that's no longer necessary nowadays, as the auxv blob is itself cached
in the inferior object.  The ppc_linux_entry_point_addr global is
obviously bad for multi-process too nowadays.

Tested on x86-64 (-m64/-m32), PPC64 (-m64/-m32) and S/390 GNU/Linux.
Yao tested the new test on ARM as well.

gdb/ChangeLog:
2015-04-10  Pedro Alves  <palves@redhat.com>

	PR gdb/13858
	* amd64-linux-tdep.c (amd64_linux_init_abi_common): Install
	linux_displaced_step_location as gdbarch_displaced_step_location
	hook.
	* arm-linux-tdep.c (arm_linux_init_abi): Likewise.
	* i386-linux-tdep.c (i386_linux_init_abi): Likewise.
	* linux-tdep.c (linux_displaced_step_location): New function,
	based on ppc_linux_displaced_step_location.
	* linux-tdep.h (linux_displaced_step_location): New declaration.
	* ppc-linux-tdep.c (ppc_linux_entry_point_addr): Delete.
	(ppc_linux_inferior_created, ppc_linux_displaced_step_location):
	Delete.
	(ppc_linux_init_abi): Install linux_displaced_step_location as
	gdbarch_displaced_step_location hook, even without Cell/B.E..
	(_initialize_ppc_linux_tdep): Don't install
	ppc_linux_inferior_created as inferior_created observer.
	* s390-linux-tdep.c (s390_gdbarch_init): Install
	linux_displaced_step_location as gdbarch_displaced_step_location
	hook.

gdb/testsuite/
2015-04-10  Pedro Alves  <palves@redhat.com>

	PR gdb/13858
	* gdb.base/step-over-no-symbols.exp: New file.
2015-04-10 10:07:02 +01:00
bfd Automatic date update in version.in 2015-04-10 00:00:08 +00:00
binutils Properly check --compress-debug-sections=XXX 2015-04-09 10:56:28 -07:00
config Set zlibdir/zlibinc with top_builddir/top_srcdir 2015-04-02 05:43:07 -07:00
cpu or1k: add missing l.msync, l.psync and l.psync instructions. 2014-07-20 20:26:09 +03:00
elfcpp Add chdr_size, Chdr, Chdr_write and Chdr_data 2015-04-08 10:29:40 -07:00
etc PR external/{16327,16328}: Remove etc/configure.texi and etc/standards.texi. 2014-06-27 11:33:25 +02:00
gas Add documentation about the interation of the ARM assembler's -EB option and the linker's --be8 option. 2015-04-10 08:26:07 +01:00
gdb PR13858 - Can't do displaced stepping with no symbols 2015-04-10 10:07:02 +01:00
gold Allow gold to resolve defined TLS symbols in a PIE link. 2015-04-09 15:47:37 -07:00
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COPYING
COPYING.LIB
COPYING.LIBGLOSS 2013-01-07 Jeff Johnston <jjohnstn@redhat.com> 2013-01-07 21:39:26 +00:00
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
COPYING3 * COPYING3: New file. Contains version 3 of the GNU General Public License. 2007-07-17 13:50:23 +00:00
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depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat * djunpack.bat: Use ".." quoting in Sed command, for the sake of 2009-03-27 13:37:09 +00:00
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libtool.m4 Update libtool.m4 from GCC trunk 2014-11-24 09:14:09 -08:00
ltgcc.m4 * libtool.m4: Update to libtool 2.2.6. 2008-09-29 15:28:14 +00:00
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
ltsugar.m4 * libtool.m4: Update to libtool 2.2.6. 2008-09-29 15:28:14 +00:00
ltversion.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
lt~obsolete.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Make all-bfd depend on all-zlib 2015-03-30 10:18:34 -07:00
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makefile.vms
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README
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