Add sp_regnum_from_eax/pc_regnum_from_eax to i386 gdbarch_tdep

* amd64-tdep.c (amd64_x32_init_abi): Set sp_regnum_from_eax to
	AMD64_RSP_REGNUM and pc_regnum_from_eax to AMD64_RIP_REGNUM.

	* i386-tdep.c (i386_gdbarch_init): Initialize sp_regnum_from_eax
	and pc_regnum_from_eax to -1.  Update SP regnum from
	sp_regnum_from_eax and PC regnum from pc_regnum_from_eax if
	needed.

	* i386-tdep.h (gdbarch_tdep): Add sp_regnum_from_eax and
	pc_regnum_from_eax.

gdb/ChangeLog

@@ -1,3 +1,16 @@
+2012-07-04  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* amd64-tdep.c (amd64_x32_init_abi): Set sp_regnum_from_eax to
+	AMD64_RSP_REGNUM and pc_regnum_from_eax to AMD64_RIP_REGNUM.
+
+	* i386-tdep.c (i386_gdbarch_init): Initialize sp_regnum_from_eax
+	and pc_regnum_from_eax to -1.  Update SP regnum from
+	sp_regnum_from_eax and PC regnum from pc_regnum_from_eax if
+	needed.
+
+	* i386-tdep.h (gdbarch_tdep): Add sp_regnum_from_eax and
+	pc_regnum_from_eax.
+
 2012-07-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	Fix 'warning: parameter has incomplete type' with gcc-3.4.6.

gdb/amd64-tdep.c

@@ -2946,6 +2946,9 @@ amd64_x32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     tdesc = tdesc_x32;
   tdep->tdesc = tdesc;
 
+  tdep->sp_regnum_from_eax = AMD64_RSP_REGNUM;
+  tdep->pc_regnum_from_eax = AMD64_RIP_REGNUM;
+
   tdep->num_dword_regs = 17;
   set_tdesc_pseudo_register_type (gdbarch, amd64_x32_pseudo_register_type);
 

gdb/i386-tdep.c

@@ -7805,6 +7805,9 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   tdep->num_mmx_regs = 8;
   tdep->num_ymm_regs = 0;
 
+  tdep->sp_regnum_from_eax = -1;
+  tdep->pc_regnum_from_eax = -1;
+
   tdesc_data = tdesc_data_alloc ();
 
   set_gdbarch_relocate_instruction (gdbarch, i386_relocate_instruction);
@@ -7849,6 +7852,14 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
       /* Support dword pseudo-register if it hasn't been disabled.  */
       tdep->eax_regnum = ymm0_regnum;
       ymm0_regnum += tdep->num_dword_regs;
+      if (tdep->sp_regnum_from_eax != -1)
+	set_gdbarch_sp_regnum (gdbarch,
+			       (tdep->eax_regnum
+				+ tdep->sp_regnum_from_eax));
+      if (tdep->pc_regnum_from_eax != -1)
+	set_gdbarch_pc_regnum (gdbarch,
+			       (tdep->eax_regnum
+				+ tdep->pc_regnum_from_eax));
     }
   else
     tdep->eax_regnum = -1;

gdb/i386-tdep.h

@@ -149,6 +149,14 @@ struct gdbarch_tdep
      of pseudo dword register support.  */
   int eax_regnum;
 
+  /* Register number for SP, relative to %eax.  Set this to -1 to
+     indicate the absence of pseudo SP register support.  */
+  int sp_regnum_from_eax;
+
+  /* Register number for PC, relative to %eax.  Set this to -1 to
+     indicate the absence of pseudo PC register support.  */
+  int pc_regnum_from_eax;
+
   /* Number of core registers.  */
   int num_core_regs;