[PATCH 1/3] Add sp_regnum_from_eax and pc_regnum_from_eax

["H.J. Lu" <hongjiu.lu@intel.com>]

Hi,

Here are the first of the last 3 patches for x32 support in GDB.  This
patch maps $pc to $eip and $sp to $esp for x32.  OK to install?

Thanks.

H.J.
---
	* 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/amd64-tdep.c |    3 +++
 gdb/i386-tdep.c  |   11 +++++++++++
 gdb/i386-tdep.h  |    8 ++++++++
 3 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 8ae1142..5424926 100644
--- a/gdb/amd64-tdep.c
+++ b/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);
 
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index fd5969d..6a02906 100644
--- a/gdb/i386-tdep.c
+++ b/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;
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index 5f233f5..76afdce 100644
--- a/gdb/i386-tdep.h
+++ b/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;
 
-- 
1.7.6.5