meta-xilinx: Restructuring meta-xilinx to support multiple layers

As discussed previously on mailing list, we are proceeding with layer
restructuring. For rocko release we will have the following layers

meta-xilinx
        ->meta-xilinx-bsp (current meta-xilinx)
        ->meta-xilinx-contrib

In the subsequent releases we will add other layers from Xilinx
meta-xilinx
        ->meta-xilinx-bsp (current meta-xilinx)
        ->meta-petalinux
        ->meta-xilinx-tools
        ->meta-xilinx-contrib

This will provide one clone to get all the required meta layers from
Xilinx for a complete solution, and the users can blacklist any layer
which they don't want to use using bblayer.conf.
This will enables us to help our vendors/partners to add their reference
designs, board definitions etc.

Recipe changes :
 * Move reference design zybo-linux-bd.bb to meta-xilinx-contrib
 * Move kernel patches realted to zybo-linux-bd-zynq7 board to
   meta-xilinx-contrib
 * Update README

Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha@xilinx.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/meta-xilinx-bsp/recipes-microblaze/gdb/files/0008-Patch-microblaze-Added-Backtrace-support-to-GDB.patch b/meta-xilinx-bsp/recipes-microblaze/gdb/files/0008-Patch-microblaze-Added-Backtrace-support-to-GDB.patch
new file mode 100644
index 00000000..7f075d55
--- /dev/null
+++ b/meta-xilinx-bsp/recipes-microblaze/gdb/files/0008-Patch-microblaze-Added-Backtrace-support-to-GDB.patch
@@ -0,0 +1,156 @@
+From 7944750e435100e72913f01aa0a43b7d7cffd421 Mon Sep 17 00:00:00 2001
+From: nagaraju <nmekala@xilix.com>
+Date: Tue, 3 Sep 2013 12:09:47 +0530
+Subject: [PATCH 08/16] [Patch, microblaze]: Added Backtrace support to GDB
+
+Added backtrace support without debugging information.
+
+Earlier backtrace used to work only when debug information is available.
+Previous pc & sp values are calculated incorrectly due to which backtrace
+was failing.
+
+In this patch, previous frame sp & pc values are calculated correctly
+in microblaze_frame_cache function and supplied them to
+microblaze_frame_prev_register function
+
+Signed-off-by:nagaraju <nmekala@xilix.com>
+Upstream-Status: Pending
+---
+ gdb/microblaze-tdep.c | 42 ++++++++++++++++++++++++++++++++++--------
+ gdb/microblaze-tdep.h |  5 +++--
+ 2 files changed, 37 insertions(+), 10 deletions(-)
+
+diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
+index 0ce4947..247740e 100644
+--- a/gdb/microblaze-tdep.c
++++ b/gdb/microblaze-tdep.c
+@@ -225,6 +225,7 @@ microblaze_alloc_frame_cache (void)
+   /* Base address.  */
+   cache->base = 0;
+   cache->pc = 0;
++  cache->saved_sp = 0;
+ 
+   /* Frameless until proven otherwise.  */
+   cache->frameless_p = 1;
+@@ -347,6 +348,7 @@ microblaze_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc,
+          cache->frameless_p = 0; /* Frame found.  */
+          save_hidden_pointer_found = 0;
+          non_stack_instruction_found = 0;
++         cache->register_offsets[rd] = -imm;
+          continue;
+        }
+       else if (IS_SPILL_SP(op, rd, ra))
+@@ -508,6 +510,7 @@ microblaze_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
+   return start_pc;
+ }
+ 
++enum { REG_UNAVAIL = (CORE_ADDR) -1 };
+ /* Normal frames.  */
+ 
+ static struct microblaze_frame_cache *
+@@ -515,7 +518,7 @@ microblaze_frame_cache (struct frame_info *next_frame, void **this_cache)
+ {
+   struct microblaze_frame_cache *cache;
+   struct gdbarch *gdbarch = get_frame_arch (next_frame);
+-  CORE_ADDR func;
++  CORE_ADDR current_pc;
+   int rn;
+ 
+   if (*this_cache)
+@@ -529,10 +532,18 @@ microblaze_frame_cache (struct frame_info *next_frame, void **this_cache)
+   for (rn = 0; rn < gdbarch_num_regs (gdbarch); rn++)
+     cache->register_offsets[rn] = -1;
+ 
+-  func = get_frame_func (next_frame);
++  cache->pc = get_frame_func (next_frame);
++  current_pc = get_frame_pc (next_frame);
++
++  if (cache->pc)
++    microblaze_analyze_prologue (gdbarch, cache->pc, current_pc,
++                                cache);
+ 
+   cache->base = get_frame_register_unsigned (next_frame, gdbarch_sp_regnum (gdbarch));
+-  cache->pc = get_frame_address_in_block (next_frame);
++  cache->saved_sp = cache->base + cache->framesize;
++
++  cache->register_offsets[MICROBLAZE_PREV_PC_REGNUM] = cache->base;
++  cache->register_offsets[MICROBLAZE_SP_REGNUM] = cache->saved_sp;
+ 
+   return cache;
+ }
+@@ -548,7 +559,7 @@ microblaze_frame_this_id (struct frame_info *next_frame, void **this_cache,
+   if (cache->base == 0)
+     return;
+ 
+-  (*this_id) = frame_id_build (cache->base, get_frame_pc (next_frame));
++  (*this_id) = frame_id_build (cache->base, cache->pc);
+ }
+ 
+ static struct value *
+@@ -558,6 +569,14 @@ microblaze_frame_prev_register (struct frame_info *this_frame,
+   struct microblaze_frame_cache *cache =
+     microblaze_frame_cache (this_frame, this_cache);
+ 
++  if ((regnum == MICROBLAZE_SP_REGNUM &&
++      cache->register_offsets[MICROBLAZE_SP_REGNUM])
++      || (regnum == MICROBLAZE_FP_REGNUM &&
++      cache->register_offsets[MICROBLAZE_SP_REGNUM]))
++
++     return frame_unwind_got_constant (this_frame, regnum,
++                                       cache->register_offsets[MICROBLAZE_SP_REGNUM]);
++
+   if (cache->frameless_p)
+     {
+       if (regnum == MICROBLAZE_PC_REGNUM)
+@@ -565,11 +584,18 @@ microblaze_frame_prev_register (struct frame_info *this_frame,
+       if (regnum == MICROBLAZE_SP_REGNUM)
+         regnum = 1;
+       return trad_frame_get_prev_register (this_frame,
+-                                          cache->saved_regs, regnum);
++            cache->saved_regs, regnum);
+     }
+-  else
+-    return trad_frame_get_prev_register (this_frame, cache->saved_regs,
+-                                        regnum);
++
++  if (regnum == MICROBLAZE_PC_REGNUM)
++    {
++      regnum = 15;
++      return frame_unwind_got_memory (this_frame, regnum,
++                                      cache->register_offsets[MICROBLAZE_PREV_PC_REGNUM]);
++    }
++
++  return trad_frame_get_prev_register (this_frame, cache->saved_regs,
++                                       regnum);
+ 
+ }
+ 
+diff --git a/gdb/microblaze-tdep.h b/gdb/microblaze-tdep.h
+index cd32e9f..14eb3ab 100644
+--- a/gdb/microblaze-tdep.h
++++ b/gdb/microblaze-tdep.h
+@@ -57,6 +57,7 @@ struct microblaze_frame_cache
+ 
+   /* Offsets to saved registers.  */
+   int register_offsets[59];    /* Must match MICROBLAZE_NUM_REGS.  */
++  CORE_ADDR saved_sp;
+ 
+   /* Table of saved registers.  */
+   struct trad_frame_saved_reg *saved_regs;
+@@ -80,11 +81,11 @@ enum microblaze_regnum
+   MICROBLAZE_R12_REGNUM,
+   MICROBLAZE_R13_REGNUM,
+   MICROBLAZE_R14_REGNUM,
+-  MICROBLAZE_R15_REGNUM,
++  MICROBLAZE_R15_REGNUM, MICROBLAZE_PREV_PC_REGNUM = MICROBLAZE_R15_REGNUM,
+   MICROBLAZE_R16_REGNUM,
+   MICROBLAZE_R17_REGNUM,
+   MICROBLAZE_R18_REGNUM,
+-  MICROBLAZE_R19_REGNUM,
++  MICROBLAZE_R19_REGNUM, MICROBLAZE_FP_REGNUM = MICROBLAZE_R19_REGNUM,
+   MICROBLAZE_R20_REGNUM,
+   MICROBLAZE_R21_REGNUM,
+   MICROBLAZE_R22_REGNUM,
+-- 
+1.9.0
+