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Fix for gdb.base/pc-fp.exp. 

It is my understanding that GDB used to require each architecture to
define a Frame Pointer (fp).  However, this functionality was deprecated
some time ago so the call to setup the fp_reg was changed to deprecated
(set_gdbarch_deprecated_fp_regnum).  It should have been removed from the
Power code.

That said, the code "set_gdbarch_deprecated_fp_regnum
(gdbarch, PPC_R0_REGNUM + 1);" sets up register r1 as the frame pointer.
Register r1 is no longer used to hold the frame pointer on Power.  By
removing the fp definition for Power in GDB, it causes GDB to fall back
to the call get_frame_base_address (frame) which returns the correct value
depending on the specific senario but most of the time is the DWARF
canonical frame address.

gdb/ChangeLog

2016-08-24  Carl Love  <cel@us.ibm.com>

	* rs6000-tdep.c (rs6000_gdbarch_init): Remove call
        set_gdbarch_deprecated_fp_regnum() from initialization function.
This commit is contained in:
Carl E. Love 2016-08-24 08:08:58 -07:00
parent ab548d2db9
commit bdd78711b4
2 changed files with 6 additions and 1 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2016-08-24 Carl Love <cel@us.ibm.com>
* rs6000-tdep.c (rs6000_gdbarch_init): Remove call
set_gdbarch_deprecated_fp_regnum() architecture
initialization function.
2016-08-23 Simon Marchi <simon.marchi@ericsson.com> 2016-08-23 Simon Marchi <simon.marchi@ericsson.com>
* stack.c (parse_frame_specification): Fix typo in comment. * stack.c (parse_frame_specification): Fix typo in comment.

1
gdb/rs6000-tdep.c
View File

@ -5957,7 +5957,6 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_pc_regnum (gdbarch, PPC_PC_REGNUM); set_gdbarch_pc_regnum (gdbarch, PPC_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, PPC_R0_REGNUM + 1); set_gdbarch_sp_regnum (gdbarch, PPC_R0_REGNUM + 1);
set_gdbarch_deprecated_fp_regnum (gdbarch, PPC_R0_REGNUM + 1);
set_gdbarch_fp0_regnum (gdbarch, tdep->ppc_fp0_regnum); set_gdbarch_fp0_regnum (gdbarch, tdep->ppc_fp0_regnum);
set_gdbarch_register_sim_regno (gdbarch, rs6000_register_sim_regno); set_gdbarch_register_sim_regno (gdbarch, rs6000_register_sim_regno);