1 files changed, 99 insertions, 0 deletions
diff --git a/gcc/config/alpha/linux-unwind.h b/gcc/config/alpha/linux-unwind.h
new file mode 100644
index 000000000..8c04b3b41
--- /dev/null
+++ b/gcc/config/alpha/linux-unwind.h
@@ -0,0 +1,99 @@
+/* DWARF2 EH unwinding support for Alpha Linux.
+   Copyright (C) 2004, 2005, 2009, 2011, 2012 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.  */
+
+#include <signal.h>
+#include <sys/ucontext.h>
+
+#define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
+
+static _Unwind_Reason_Code
+alpha_fallback_frame_state (struct _Unwind_Context *context,
+			    _Unwind_FrameState *fs)
+{
+  unsigned int *pc = context->ra;
+  struct sigcontext *sc;
+  long new_cfa;
+  int i;
+
+  if (pc[0] != 0x47fe0410		/* mov $30,$16 */
+      || pc[2] != 0x00000083)		/* callsys */
+    return _URC_END_OF_STACK;
+  if (context->cfa == 0)
+    return _URC_END_OF_STACK;
+  if (pc[1] == 0x201f0067)		/* lda $0,NR_sigreturn */
+    sc = context->cfa;
+  else if (pc[1] == 0x201f015f)		/* lda $0,NR_rt_sigreturn */
+    {
+      struct rt_sigframe {
+	siginfo_t info;
+	struct ucontext uc;
+      } *rt_ = context->cfa;
+      sc = &rt_->uc.uc_mcontext;
+    }
+  else
+    return _URC_END_OF_STACK;
+
+  new_cfa = sc->sc_regs[30];
+  fs->regs.cfa_how = CFA_REG_OFFSET;
+  fs->regs.cfa_reg = 30;
+  fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+  for (i = 0; i < 30; ++i)
+    {
+      fs->regs.reg[i].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i].loc.offset
+	= (long) &sc->sc_regs[i] - new_cfa;
+    }
+  for (i = 0; i < 31; ++i)
+    {
+      fs->regs.reg[i+32].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i+32].loc.offset
+	= (long) &sc->sc_fpregs[i] - new_cfa;
+    }
+  fs->regs.reg[64].how = REG_SAVED_OFFSET;
+  fs->regs.reg[64].loc.offset = (long)&sc->sc_pc - new_cfa;
+  fs->retaddr_column = 64;
+  fs->signal_frame = 1;
+
+  return _URC_NO_REASON;
+}
+
+#define MD_FROB_UPDATE_CONTEXT alpha_frob_update_context
+
+/* Fix up for signal handlers that don't have S flag set.  */
+
+static void
+alpha_frob_update_context (struct _Unwind_Context *context,
+			   _Unwind_FrameState *fs ATTRIBUTE_UNUSED)
+{
+  unsigned int *pc = context->ra;
+
+  if (pc[0] == 0x47fe0410		/* mov $30,$16 */
+      && pc[2] == 0x00000083		/* callsys */
+      && (pc[1] == 0x201f0067		/* lda $0,NR_sigreturn */
+	  || pc[1] == 0x201f015f))	/* lda $0,NR_rt_sigreturn */
+    _Unwind_SetSignalFrame (context, 1);
+}