obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
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if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 202 insertions, 0 deletions

diff --git a/gcc/config/sparc/linux-unwind.h b/gcc/config/sparc/linux-unwind.h
new file mode 100644
index 000000000..adfef6ec2
--- /dev/null
+++ b/gcc/config/sparc/linux-unwind.h
@@ -0,0 +1,202 @@
+/* DWARF2 EH unwinding support for SPARC Linux.
+   Copyright 2004, 2005, 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* Do code reading to identify a signal frame, and set the frame
+   state data appropriately.  See unwind-dw2.c for the structs.  */
+
+#if defined(__arch64__)
+
+/* 64-bit SPARC version */
+#define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
+
+static _Unwind_Reason_Code
+sparc64_fallback_frame_state (struct _Unwind_Context *context,
+			      _Unwind_FrameState *fs)
+{
+  unsigned int *pc = context->ra;
+  long this_cfa = (long) context->cfa;
+  long new_cfa, ra_location, shifted_ra_location;
+  long regs_off, fpu_save_off;
+  long fpu_save;
+  int i;
+
+  if (pc[0] != 0x82102065	/* mov NR_rt_sigreturn, %g1 */
+      || pc[1] != 0x91d0206d)	/* ta 0x6d */
+    return _URC_END_OF_STACK;
+
+  regs_off = 192 + 128;
+  fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4);
+
+  new_cfa = *(long *)(this_cfa + regs_off + (14 * 8));
+  new_cfa += 2047; /* Stack bias */
+  fpu_save = *(long *)(this_cfa + fpu_save_off);
+  fs->regs.cfa_how = CFA_REG_OFFSET;
+  fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
+  fs->regs.cfa_offset = new_cfa - this_cfa;
+
+  for (i = 1; i < 16; i++)
+    {
+      /* We never restore %sp as everything is purely CFA-based.  */
+      if ((unsigned int) i == __builtin_dwarf_sp_column ())
+	continue;
+
+      fs->regs.reg[i].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i].loc.offset
+	= this_cfa + regs_off + (i * 8) - new_cfa;
+    }
+  for (i = 0; i < 16; i++)
+    {
+      fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i + 16].loc.offset
+	= this_cfa + (i * 8) - new_cfa;
+    }
+  if (fpu_save)
+    {
+      for (i = 0; i < 64; i++)
+	{
+	  if (i > 32 && (i & 0x1))
+	    continue;
+	  fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[i + 32].loc.offset
+	    = fpu_save + (i * 4) - new_cfa;
+	}
+    }
+
+  /* State the rules to find the kernel's code "return address", which is
+     the address of the active instruction when the signal was caught.
+     On the SPARC, since RETURN_ADDR_OFFSET (essentially 8) is defined, we
+     need to preventively subtract it from the purported return address.  */
+  ra_location = this_cfa + regs_off + 17 * 8;
+  shifted_ra_location = this_cfa + regs_off + 19 * 8; /* Y register */
+  *(long *)shifted_ra_location = *(long *)ra_location - 8;
+  fs->retaddr_column = 0;
+  fs->regs.reg[0].how = REG_SAVED_OFFSET;
+  fs->regs.reg[0].loc.offset = shifted_ra_location - new_cfa;
+  fs->signal_frame = 1;
+
+  return _URC_NO_REASON;
+}
+
+#define MD_FROB_UPDATE_CONTEXT sparc64_frob_update_context
+
+static void
+sparc64_frob_update_context (struct _Unwind_Context *context,
+			     _Unwind_FrameState *fs)
+{
+  /* The column of %sp contains the old CFA, not the old value of %sp.
+     The CFA offset already comprises the stack bias so, when %sp is the
+     CFA register, we must avoid counting the stack bias twice.  Do not
+     do that for signal frames as the offset is artificial for them.  */
+  if (fs->regs.cfa_reg == __builtin_dwarf_sp_column ()
+      && fs->regs.cfa_how == CFA_REG_OFFSET
+      && fs->regs.cfa_offset != 0
+      && !fs->signal_frame)
+    context->cfa -= 2047;
+}
+
+#else
+
+/* 32-bit SPARC version */
+#define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state
+
+static _Unwind_Reason_Code
+sparc_fallback_frame_state (struct _Unwind_Context *context,
+			    _Unwind_FrameState *fs)
+{
+  unsigned int *pc = context->ra;
+  int this_cfa = (int) context->cfa;
+  int new_cfa, ra_location, shifted_ra_location;
+  int regs_off, fpu_save_off;
+  int fpu_save;
+  int old_style, i;
+
+  if (pc[1] != 0x91d02010)	/* ta 0x10 */
+    return _URC_END_OF_STACK;
+
+  if (pc[0] == 0x821020d8)	/* mov NR_sigreturn, %g1 */
+    old_style = 1;
+  else if (pc[0] == 0x82102065)	/* mov NR_rt_sigreturn, %g1 */
+    old_style = 0;
+  else
+    return _URC_END_OF_STACK;
+
+  if (old_style)
+    {
+      regs_off = 96;
+      fpu_save_off = regs_off + (4 * 4) + (16 * 4);
+    }
+  else
+    {
+      regs_off = 96 + 128;
+      fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4);
+    }
+
+  new_cfa = *(int *)(this_cfa + regs_off + (4 * 4) + (14 * 4));
+  fpu_save = *(int *)(this_cfa + fpu_save_off);
+  fs->regs.cfa_how = CFA_REG_OFFSET;
+  fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
+  fs->regs.cfa_offset = new_cfa - this_cfa;
+
+  for (i = 1; i < 16; i++)
+    {
+      /* We never restore %sp as everything is purely CFA-based.  */
+      if ((unsigned int) i == __builtin_dwarf_sp_column ())
+	continue;
+
+      fs->regs.reg[i].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i].loc.offset
+	= this_cfa + regs_off + (4 * 4) + (i * 4) - new_cfa;
+    }
+  for (i = 0; i < 16; i++)
+    {
+      fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i + 16].loc.offset
+	= this_cfa + (i * 4) - new_cfa;
+    }
+  if (fpu_save)
+    {
+      for (i = 0; i < 32; i++)
+	{
+	  fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[i + 32].loc.offset
+	    = fpu_save + (i * 4) - new_cfa;
+	}
+    }
+
+  /* State the rules to find the kernel's code "return address", which is
+     the address of the active instruction when the signal was caught.
+     On the SPARC, since RETURN_ADDR_OFFSET (essentially 8) is defined, we
+     need to preventively subtract it from the purported return address.  */
+  ra_location = this_cfa + regs_off + 4;
+  shifted_ra_location = this_cfa + regs_off + 3 * 4; /* Y register */
+  *(int *)shifted_ra_location = *(int *)ra_location - 8;
+  fs->retaddr_column = 0;
+  fs->regs.reg[0].how = REG_SAVED_OFFSET;
+  fs->regs.reg[0].loc.offset = shifted_ra_location - new_cfa;
+  fs->signal_frame = 1;
+
+  return _URC_NO_REASON;
+}
+
+#endif