1 files changed, 148 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-4.9/0055-dwarf-reg-processing-helper.patch b/meta/recipes-devtools/gcc/gcc-4.9/0055-dwarf-reg-processing-helper.patch
new file mode 100644
index 0000000000..557dab0f31
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.9/0055-dwarf-reg-processing-helper.patch
@@ -0,0 +1,148 @@
+From 4fd39f1329379e00f958394adde6be96f0caf21f Mon Sep 17 00:00:00 2001
+From: hainque <hainque@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Fri, 5 Dec 2014 16:53:22 +0000
+Subject: [PATCH] 2014-12-05  Olivier Hainque  <hainque@adacore.com>
+
+        * dwarf2cfi.c (init_one_dwarf_reg_size): New helper, processing
+        one particular reg for expand_builtin_init_dwarf_reg_sizes.
+        (expand_builtin_init_dwarf_reg_sizes): Rework to use helper and
+        account for dwarf register spans.
+
+
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218428 138bc75d-0d04-0410-961f-82ee72b054a4
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Backport [gcc 5.0]
+
+---
+ gcc/ChangeLog   |  7 +++++
+ gcc/dwarf2cfi.c | 98 +++++++++++++++++++++++++++++++++++++++++++++------------
+ 2 files changed, 85 insertions(+), 20 deletions(-)
+
+Index: gcc-4.9.2/gcc/dwarf2cfi.c
+===================================================================
+--- gcc-4.9.2.orig/gcc/dwarf2cfi.c
++++ gcc-4.9.2/gcc/dwarf2cfi.c
+@@ -252,7 +252,59 @@ init_return_column_size (enum machine_mo
+                  gen_int_mode (size, mode));
+ }
+ 
+-/* Generate code to initialize the register size table.  */
++/* Datastructure used by expand_builtin_init_dwarf_reg_sizes and
++   init_one_dwarf_reg_size to communicate on what has been done by the
++   latter.  */
++
++typedef struct
++{
++  /* Whether the dwarf return column was initialized.  */
++  bool wrote_return_column;
++
++  /* For each hard register REGNO, whether init_one_dwarf_reg_size
++     was given REGNO to process already.  */
++  bool processed_regno [FIRST_PSEUDO_REGISTER];
++
++} init_one_dwarf_reg_state;
++
++/* Helper for expand_builtin_init_dwarf_reg_sizes.  Generate code to
++   initialize the dwarf register size table entry corresponding to register
++   REGNO in REGMODE.  TABLE is the table base address, SLOTMODE is the mode to
++   use for the size entry to initialize, and INIT_STATE is the communication
++   datastructure conveying what we're doing to our caller.  */
++
++static
++void init_one_dwarf_reg_size (int regno, machine_mode regmode,
++                             rtx table, machine_mode slotmode,
++                             init_one_dwarf_reg_state *init_state)
++{
++  const unsigned int dnum = DWARF_FRAME_REGNUM (regno);
++  const unsigned int rnum = DWARF2_FRAME_REG_OUT (dnum, 1);
++
++  const HOST_WIDE_INT slotoffset = rnum * GET_MODE_SIZE (slotmode);
++  const HOST_WIDE_INT regsize = GET_MODE_SIZE (regmode);
++
++  init_state->processed_regno[regno] = true;
++
++  if (rnum >= DWARF_FRAME_REGISTERS)
++    return;
++
++  if (dnum == DWARF_FRAME_RETURN_COLUMN)
++    {
++      if (regmode == VOIDmode)
++       return;
++      init_state->wrote_return_column = true;
++    }
++
++  if (slotoffset < 0)
++    return;
++
++  emit_move_insn (adjust_address (table, slotmode, slotoffset),
++                 gen_int_mode (regsize, slotmode));
++}
++
++/* Generate code to initialize the dwarf register size table located
++   at the provided ADDRESS.  */
+ 
+ void
+ expand_builtin_init_dwarf_reg_sizes (tree address)
+@@ -261,35 +313,40 @@ expand_builtin_init_dwarf_reg_sizes (tre
+   enum machine_mode mode = TYPE_MODE (char_type_node);
+   rtx addr = expand_normal (address);
+   rtx mem = gen_rtx_MEM (BLKmode, addr);
+-  bool wrote_return_column = false;
++
++  init_one_dwarf_reg_state init_state;
++
++  memset ((char *)&init_state, 0, sizeof (init_state));
+ 
+   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+     {
+-      unsigned int dnum = DWARF_FRAME_REGNUM (i);
+-      unsigned int rnum = DWARF2_FRAME_REG_OUT (dnum, 1);
+-
+-      if (rnum < DWARF_FRAME_REGISTERS)
+-       {
+-         HOST_WIDE_INT offset = rnum * GET_MODE_SIZE (mode);
+-         HOST_WIDE_INT size;
+-         enum machine_mode save_mode = targetm.dwarf_frame_reg_mode (i);
++      machine_mode save_mode;
++      rtx span;
+ 
+-         if (dnum == DWARF_FRAME_RETURN_COLUMN)
++      /* No point in processing a register multiple times.  This could happen
++        with register spans, e.g. when a reg is first processed as a piece of
++        a span, then as a register on its own later on.  */
++
++      if (init_state.processed_regno[i])
++       continue;
++
++      save_mode = targetm.dwarf_frame_reg_mode (i);
++      span = targetm.dwarf_register_span (gen_rtx_REG (save_mode, i));
++      if (!span)
++       init_one_dwarf_reg_size (i, save_mode, mem, mode, &init_state);
++      else
++       {
++         for (int si = 0; si < XVECLEN (span, 0); si++)
+            {
+-             if (save_mode == VOIDmode)
+-               continue;
+-             wrote_return_column = true;
+-           }
+-         size = GET_MODE_SIZE (save_mode);
+-         if (offset < 0)
+-           continue;
++             rtx reg = XVECEXP (span, 0, si);
++             init_one_dwarf_reg_size
++               (REGNO (reg), GET_MODE (reg), mem, mode, &init_state);
++           }
+ 
+-         emit_move_insn (adjust_address (mem, mode, offset),
+-                         gen_int_mode (size, mode));
+        }
+     }
+ 
+-  if (!wrote_return_column)
++  if (!init_state.wrote_return_column)
+     init_return_column_size (mode, mem, DWARF_FRAME_RETURN_COLUMN);
+ 
+ #ifdef DWARF_ALT_FRAME_RETURN_COLUMN