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.

1 files changed, 5 insertions, 0 deletions

diff --git a/gdb/linux-tdep.h b/gdb/linux-tdep.h
index 78fc36b..ff45286 100644
--- a/gdb/linux-tdep.h
+++ b/gdb/linux-tdep.h
@@ -37,6 +37,11 @@ extern enum gdb_signal linux_gdb_signal_from_target (struct gdbarch *gdbarch,
 extern int linux_gdb_signal_to_target (struct gdbarch *gdbarch,
 				       enum gdb_signal signal);
 
+/* Default GNU/Linux implementation of `displaced_step_location', as
+   defined in gdbarch.h.  Determines the entry point from AT_ENTRY in
+   the target auxiliary vector.  */
+extern CORE_ADDR linux_displaced_step_location (struct gdbarch *gdbarch);
+
 extern void linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch);
 
 extern int linux_is_uclinux (void);