gcc:

	* config/alpha/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/alpha/osf5.h (MD_UNWIND_SUPPORT): Remove.
	* config/alpha/vms.h (MD_UNWIND_SUPPORT): Remove.
	* config/bfin/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/bfin/uclinux.h (MD_UNWIND_SUPPORT): Remove.
	* config/i386/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/i386/linux64.h (MD_UNWIND_SUPPORT): Remove.
	* config/i386/sol2.h (MD_UNWIND_SUPPORT): Remove.
	* config/i386/mingw32.h (MD_UNWIND_SUPPORT): Remove.
	* config/ia64/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/ia64/vms.h (MD_UNWIND_SUPPORT): Remove.
	* config/m68k/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/mips/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/pa/pa-hpux.h (MD_UNWIND_SUPPORT): Remove.
	* config/pa/pa32-linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/rs6000/darwin.h (MD_UNWIND_SUPPORT): Remove.
	* config/rs6000/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/rs6000/linux64.h (MD_UNWIND_SUPPORT): Remove.
	* config/s390/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/s390/tpf.h (MD_UNWIND_SUPPORT): Remove.
	* config/sh/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/sparc/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/sparc/linux64.h (MD_UNWIND_SUPPORT): Remove.
	* config/sparc/sol2.h (MD_UNWIND_SUPPORT): Remove.
	* config/xtensa/linux.h (MD_UNWIND_SUPPORT): Remove.
	* config/alpha/linux-unwind.h: Move to ../libgcc/config/alpha.
	* config/alpha/osf5-unwind.h: Move to ../libgcc/config/alpha.
	* config/alpha/vms-unwind.h: Move to ../libgcc/config/alpha.
	* config/bfin/linux-unwind.h: Move to ../libgcc/config/bfin.
	* config/i386/linux-unwind.h: Move to ../libgcc/config/i386.
	* config/i386/sol2-unwind.h: Move to ../libgcc/config/i386.
	* config/i386/w32-unwind.h: Move to ../libgcc/config/i386.
	* config/ia64/linux-unwind.h: Move to ../libgcc/config/ia64.
	* config/ia64/vms-unwind.h: Move to ../libgcc/config/ia64.
	* config/m68k/linux-unwind.h: Move to ../libgcc/config/m68k.
	* config/mips/linux-unwind.h: Move to ../libgcc/config/mips.
	* config/pa/hpux-unwind.h: Move to ../libgcc/config/pa.
	* config/pa/linux-unwind.h: Move to ../libgcc/config/pa.
	* config/rs6000/darwin-unwind.h: Move to ../libgcc/config/rs6000.
	* config/rs6000/linux-unwind.h: Move to ../libgcc/config/rs6000.
	* config/s390/linux-unwind.h: Move to ../libgcc/config/s390.
	* config/s390/tpf-unwind.h: Move to ../libgcc/config/s390.
	* config/sh/linux-unwind.h: Move to ../libgcc/config/sh.
	* config/sparc/linux-unwind.h: Move to ../libgcc/config/sparc.
	* config/sparc/sol2-unwind.h: Move to ../libgcc/config/sparc.
	* config/xtensa/linux-unwind.h: Move to ../libgcc/config/xtensa.
	* config/darwin9.h (DARWIN_LIBSYSTEM_HAS_UNWIND): Remove.
	* system.h (MD_UNWIND_SUPPORT): Poison.
	* doc/tm.texi.in (Exception Handling, MD_UNWIND_SUPPORT): Remove.
	* doc/tm.texi: Regenerate.
	* unwind-dw2.c: Include md-unwind-support.h instead of
	MD_UNWIND_SUPPORT.
	* config/ia64/unwind-ia64.c: Likewise.
	* config/xtensa/unwind-dw2-xtensa.c: Likewise.

	libgcc:
	* config/alpha/linux-unwind.h: Move from ../gcc/config/alpha.
	* config/alpha/osf5-unwind.h: Move from ../gcc/config/alpha.
	* config/alpha/vms-unwind.h: Move from ../gcc/config/alpha.
	* config/bfin/linux-unwind.h: Move from ../gcc/config/bfin.
	* config/i386/linux-unwind.h: Move from ../gcc/config/i386.
	* config/i386/sol2-unwind.h: Move from ../gcc/config/i386.
	* config/i386/w32-unwind.h: Move from ../gcc/config/i386.
	Wrap in !__MINGW64__.
	* config/ia64/linux-unwind.h: Move from ../gcc/config/ia64.
	* config/ia64/vms-unwind.h: Move from ../gcc/config/ia64.
	* config/m68k/linux-unwind.h: Move from ../gcc/config/m68k.
	* config/mips/linux-unwind.h: Move from ../gcc/config/mips.
	* config/pa/hpux-unwind.h: Move from ../gcc/config/pa.
	* config/pa/linux-unwind.h: Move from ../gcc/config/pa.
	* config/rs6000/darwin-unwind.h: Move from ../gcc/config/rs6000.
	Wrap in !__LP64__.
	* config/rs6000/linux-unwind.h: Move from ../gcc/config/rs6000.
	* config/s390/linux-unwind.h: Move from ../gcc/config/s390.
	* config/s390/tpf-unwind.h: Move from ../gcc/config/s390.
	* config/sh/linux-unwind.h: Move from ../gcc/config/sh.
	* config/sparc/linux-unwind.h: Move from ../gcc/config/sparc.
	* config/sparc/sol2-unwind.h: Move from ../gcc/config/sparc.
	* config/xtensa/linux-unwind.h: Move from ../gcc/config/xtensa.
	* config/no-unwind.h: New file.
	* config.host (md_unwind_header): Document.
	Define.
	(alpha*-*-linux*, alpha*-dec-osf5.1*, alpha64-dec-*vms*,
	alpha*-dec-*vms*, bfin*-uclinux*, bfin*-linux-uclibc*,
	hppa*-*-linux*, hppa[12]*-*-hpux10*, hppa*64*-*-hpux11*,
	hppa[12]*-*-hpux11*): Set md_unwind_header.
	(i[34567]86-*-linux*): Handle i[34567]86-*-kopensolaris*-gnu.
	Set md_unwind_header.
	(x86_64-*-linux*, i[34567]86-*-solaris2*): Set md_unwind_header.
	(i[34567]86-*-cygwin*): Split from i[34567]86-*-mingw*.
	(i[34567]86-*-mingw*, ia64*-*-linux*, ia64-hp-*vms*,
	m68k-*-uclinux*, m68k-*-linux*, mips64*-*-linux*, mips*-*-linux*,
	powerpc-*-darwin*, powerpc-*-linux*, s390-*-linux*,
	s390x-*-linux*,  s390x-ibm-tpf*, sh*-*-linux*, sparc-*-linux*,
	sparc*-*-solaris2*, sparc64-*-linux*, xtensa*-*-linux*): Set
	md_unwind_header.
	* configure.ac: Link md-unwind-support.h to $md_unwind_header.
	* configure: Regenerate.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@174613 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 502 insertions, 0 deletions

diff --git a/libgcc/config/pa/hpux-unwind.h b/libgcc/config/pa/hpux-unwind.h
new file mode 100644
index 00000000000..92061ec3677
--- /dev/null
+++ b/libgcc/config/pa/hpux-unwind.h
@@ -0,0 +1,361 @@
+/* DWARF2 EH unwinding support for PA HP-UX.
+   Copyright (C) 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.  */
+
+/* Don't use this if inhibit_libc is set.
+   The build for this target will fail trying to include missing headers. */
+#ifndef inhibit_libc
+#include <signal.h>
+#include <sys/ucontext.h>
+#include <unistd.h>
+
+/* FIXME: We currently ignore the high halves of general, space and
+   control registers on PA 2.0 machines for applications using the
+   32-bit runtime.  We don't restore space registers or the floating
+   point status registers.  */
+
+#define MD_FALLBACK_FRAME_STATE_FOR pa_fallback_frame_state
+
+/* HP-UX 10.X doesn't define GetSSReg.  */
+#ifndef GetSSReg
+#define GetSSReg(ssp, ss_reg) \
+  ((UseWideRegs (ssp))							\
+   ? (ssp)->ss_wide.ss_32.ss_reg ## _lo					\
+   : (ssp)->ss_narrow.ss_reg)
+#endif
+
+#if TARGET_64BIT
+#define GetSSRegAddr(ssp, ss_reg) ((long) &((ssp)->ss_wide.ss_64.ss_reg))
+#else
+#define GetSSRegAddr(ssp, ss_reg) \
+  ((UseWideRegs (ssp))							\
+   ? (long) &((ssp)->ss_wide.ss_32.ss_reg ## _lo)			\
+   : (long) &((ssp)->ss_narrow.ss_reg))
+#endif
+
+#define UPDATE_FS_FOR_SAR(FS, N) \
+  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;				\
+  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_cr11) - new_cfa
+
+#define UPDATE_FS_FOR_GR(FS, GRN, N) \
+  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;				\
+  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_gr##GRN) - new_cfa
+
+#define UPDATE_FS_FOR_FR(FS, FRN, N) \
+  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;				\
+  (FS)->regs.reg[N].loc.offset = (long) &(mc->ss_fr##FRN) - new_cfa;
+
+#define UPDATE_FS_FOR_PC(FS, N) \
+  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;				\
+  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_pcoq_head) - new_cfa
+
+/* Extract bit field from word using HP's numbering (MSB = 0).  */
+#define GET_FIELD(X, FROM, TO) \
+  ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
+
+static inline int
+sign_extend (int x, int len)
+{
+  int signbit = (1 << (len - 1));
+  int mask = (signbit << 1) - 1;
+  return ((x & mask) ^ signbit) - signbit;
+}
+
+/* Extract a 17-bit signed constant from branch instructions.  */
+static inline int
+extract_17 (unsigned word)
+{
+  return sign_extend (GET_FIELD (word, 19, 28)
+		      | GET_FIELD (word, 29, 29) << 10
+		      | GET_FIELD (word, 11, 15) << 11
+		      | (word & 0x1) << 16, 17);
+}
+
+/* Extract a 22-bit signed constant from branch instructions.  */
+static inline int
+extract_22 (unsigned word)
+{
+  return sign_extend (GET_FIELD (word, 19, 28)
+		      | GET_FIELD (word, 29, 29) << 10
+		      | GET_FIELD (word, 11, 15) << 11
+		      | GET_FIELD (word, 6, 10) << 16
+		      | (word & 0x1) << 21, 22);
+}
+
+static _Unwind_Reason_Code
+pa_fallback_frame_state (struct _Unwind_Context *context,
+			 _Unwind_FrameState *fs)
+{
+  static long cpu;
+  unsigned int *pc = (unsigned int *) context->ra;
+
+  if (pc == 0)
+    return _URC_END_OF_STACK;
+
+  /* Check for relocation of the return value.  */
+  if (!TARGET_64BIT
+      && *(pc + 0) == 0x2fd01224		/* fstd,ma fr4,8(sp) */
+      && *(pc + 1) == 0x0fd9109d		/* ldw -4(sp),ret1 */
+      && *(pc + 2) == 0x0fd130bc)		/* ldw,mb -8(sp),ret0 */
+    pc += 3;
+  else if (!TARGET_64BIT
+	   && *(pc + 0) == 0x27d01224		/* fstw,ma fr4,8(sp) */
+	   && *(pc + 1) == 0x0fd130bc)		/* ldw,mb -8(sp),ret0 */
+    pc += 2;
+  else if (!TARGET_64BIT
+	   && *(pc + 0) == 0x0fdc12b0		/* stw,ma ret0,8(sp) */
+	   && *(pc + 1) == 0x0fdd1299		/* stw ret1,-4(sp) */
+	   && *(pc + 2) == 0x2fd13024)		/* fldd,mb -8(sp),fr4 */
+    pc += 3;
+  else if (!TARGET_64BIT
+	   && *(pc + 0) == 0x0fdc12b0		/* stw,ma ret0,8(sp) */
+	   && *(pc + 1) == 0x27d13024)		/* fldw,mb -8(sp),fr4 */
+    pc += 2;
+
+  /* Check if the return address points to an export stub (PA 1.1 or 2.0).  */
+  if ((!TARGET_64BIT
+       && *(pc + 0) == 0x4bc23fd1		/* ldw -18(sp),rp */
+       && *(pc + 1) == 0x004010a1		/* ldsid (rp),r1 */
+       && *(pc + 2) == 0x00011820		/* mtsp r1,sr0 */
+       && *(pc + 3) == 0xe0400002)		/* be,n 0(sr0,rp) */
+      ||
+      (!TARGET_64BIT
+       && *(pc + 0) == 0x4bc23fd1		/* ldw -18(sp),rp */
+       && *(pc + 1) == 0xe840d002))		/* bve,n (rp) */
+    {
+      fs->regs.cfa_how    = CFA_REG_OFFSET;
+      fs->regs.cfa_reg    = 30;
+      fs->regs.cfa_offset = 0;
+
+      fs->retaddr_column = 0;
+      fs->regs.reg[0].how = REG_SAVED_OFFSET;
+      fs->regs.reg[0].loc.offset = -24;
+
+      /* Update context to describe the stub frame.  */
+      uw_update_context (context, fs);
+
+      /* Set up fs to describe the FDE for the caller of this stub.  */
+      return uw_frame_state_for (context, fs);
+    }
+  /* Check if the return address points to a relocation stub.  */
+  else if (!TARGET_64BIT
+	   && *(pc + 0) == 0x0fd11082		/* ldw -8(sp),rp */
+	   && (*(pc + 1) == 0xe840c002		/* bv,n r0(rp) */
+	       || *(pc + 1) == 0xe840d002))	/* bve,n (rp) */
+    {
+      fs->regs.cfa_how    = CFA_REG_OFFSET;
+      fs->regs.cfa_reg    = 30;
+      fs->regs.cfa_offset = 0;
+
+      fs->retaddr_column = 0;
+      fs->regs.reg[0].how = REG_SAVED_OFFSET;
+      fs->regs.reg[0].loc.offset = -8;
+
+      /* Update context to describe the stub frame.  */
+      uw_update_context (context, fs);
+
+      /* Set up fs to describe the FDE for the caller of this stub.  */
+      return uw_frame_state_for (context, fs);
+    }
+
+  /* Check if the return address is an export stub as signal handlers
+     may return via an export stub.  */
+  if (!TARGET_64BIT
+      && (*pc & 0xffe0e002) == 0xe8400000	/* bl x,r2 */
+      && *(pc + 1) == 0x08000240		/* nop */
+      && *(pc + 2) == 0x4bc23fd1		/* ldw -18(sp),rp */
+      && *(pc + 3) == 0x004010a1		/* ldsid (rp),r1 */
+      && *(pc + 4) == 0x00011820		/* mtsp r1,sr0 */
+      && *(pc + 5) == 0xe0400002)		/* be,n 0(sr0,rp) */
+    /* Extract target address from PA 1.x 17-bit branch.  */
+    pc += extract_17 (*pc) + 2;
+  else if (!TARGET_64BIT
+	   && (*pc & 0xfc00e002) == 0xe800a000	/* b,l x,r2 */
+	   && *(pc + 1) == 0x08000240		/* nop */
+	   && *(pc + 2) == 0x4bc23fd1		/* ldw -18(sp),rp */
+	   && *(pc + 3) == 0xe840d002)		/* bve,n (rp) */
+    /* Extract target address from PA 2.0 22-bit branch.  */
+    pc += extract_22 (*pc) + 2;
+
+  /* Now check if the return address is one of the signal handler
+     returns, _sigreturn or _sigsetreturn.  */
+  if ((TARGET_64BIT
+       && *(pc + 0)  == 0x53db3f51		/* ldd -58(sp),dp */
+       && *(pc + 8)  == 0x34160116		/* ldi 8b,r22 */
+       && *(pc + 9)  == 0x08360ac1		/* shladd,l r22,3,r1,r1 */
+       && *(pc + 10) == 0x0c2010c1		/* ldd 0(r1),r1 */
+       && *(pc + 11) == 0xe4202000)		/* be,l 0(sr4,r1) */
+      ||
+      (TARGET_64BIT
+       && *(pc + 0)  == 0x36dc0000		/* ldo 0(r22),ret0 */
+       && *(pc + 6)  == 0x341601c0		/* ldi e0,r22 */
+       && *(pc + 7)  == 0x08360ac1		/* shladd,l r22,3,r1,r1 */
+       && *(pc + 8)  == 0x0c2010c1		/* ldd 0(r1),r1 */
+       && *(pc + 9)  == 0xe4202000)		/* be,l 0(sr4,r1) */
+      ||
+      (!TARGET_64BIT
+       && *(pc + 0)  == 0x379a0000		/* ldo 0(ret0),r26 */
+       && *(pc + 1)  == 0x6bd33fc9		/* stw r19,-1c(sp) */
+       && *(pc + 2)  == 0x20200801		/* ldil L%-40000000,r1 */
+       && *(pc + 3)  == 0xe420e008		/* be,l 4(sr7,r1) */
+       && *(pc + 4)  == 0x34160116)		/* ldi 8b,r22 */
+      ||
+      (!TARGET_64BIT
+       && *(pc + 0)  == 0x6bd33fc9		/* stw r19,-1c(sp) */
+       && *(pc + 1)  == 0x20200801		/* ldil L%-40000000,r1 */
+       && *(pc + 2)  == 0xe420e008		/* be,l 4(sr7,r1) */
+       && *(pc + 3)  == 0x341601c0))		/* ldi e0,r22 */
+    {
+      /* The previous stack pointer is saved at (long *)SP - 1.  The
+	 ucontext structure is offset from the start of the previous
+	 frame by the siglocal_misc structure.  */
+      struct siglocalx *sl = (struct siglocalx *)
+	(*((long *) context->cfa - 1));
+      mcontext_t *mc = &(sl->sl_uc.uc_mcontext);
+
+      long new_cfa = GetSSReg (mc, ss_sp);
+
+      fs->regs.cfa_how = CFA_REG_OFFSET;
+      fs->regs.cfa_reg = 30;
+      fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+
+      UPDATE_FS_FOR_GR (fs, 1, 1);
+      UPDATE_FS_FOR_GR (fs, 2, 2);
+      UPDATE_FS_FOR_GR (fs, 3, 3);
+      UPDATE_FS_FOR_GR (fs, 4, 4);
+      UPDATE_FS_FOR_GR (fs, 5, 5);
+      UPDATE_FS_FOR_GR (fs, 6, 6);
+      UPDATE_FS_FOR_GR (fs, 7, 7);
+      UPDATE_FS_FOR_GR (fs, 8, 8);
+      UPDATE_FS_FOR_GR (fs, 9, 9);
+      UPDATE_FS_FOR_GR (fs, 10, 10);
+      UPDATE_FS_FOR_GR (fs, 11, 11);
+      UPDATE_FS_FOR_GR (fs, 12, 12);
+      UPDATE_FS_FOR_GR (fs, 13, 13);
+      UPDATE_FS_FOR_GR (fs, 14, 14);
+      UPDATE_FS_FOR_GR (fs, 15, 15);
+      UPDATE_FS_FOR_GR (fs, 16, 16);
+      UPDATE_FS_FOR_GR (fs, 17, 17);
+      UPDATE_FS_FOR_GR (fs, 18, 18);
+      UPDATE_FS_FOR_GR (fs, 19, 19);
+      UPDATE_FS_FOR_GR (fs, 20, 20);
+      UPDATE_FS_FOR_GR (fs, 21, 21);
+      UPDATE_FS_FOR_GR (fs, 22, 22);
+      UPDATE_FS_FOR_GR (fs, 23, 23);
+      UPDATE_FS_FOR_GR (fs, 24, 24);
+      UPDATE_FS_FOR_GR (fs, 25, 25);
+      UPDATE_FS_FOR_GR (fs, 26, 26);
+      UPDATE_FS_FOR_GR (fs, 27, 27);
+      UPDATE_FS_FOR_GR (fs, 28, 28);
+      UPDATE_FS_FOR_GR (fs, 29, 29);
+      UPDATE_FS_FOR_GR (fs, 30, 30);
+      UPDATE_FS_FOR_GR (fs, 31, 31);
+
+      if (TARGET_64BIT)
+	{
+	  UPDATE_FS_FOR_FR (fs, 4, 32);
+	  UPDATE_FS_FOR_FR (fs, 5, 33);
+	  UPDATE_FS_FOR_FR (fs, 6, 34);
+	  UPDATE_FS_FOR_FR (fs, 7, 35);
+	  UPDATE_FS_FOR_FR (fs, 8, 36);
+	  UPDATE_FS_FOR_FR (fs, 9, 37);
+	  UPDATE_FS_FOR_FR (fs, 10, 38);
+	  UPDATE_FS_FOR_FR (fs, 11, 39);
+	  UPDATE_FS_FOR_FR (fs, 12, 40);
+	  UPDATE_FS_FOR_FR (fs, 13, 41);
+	  UPDATE_FS_FOR_FR (fs, 14, 42);
+	  UPDATE_FS_FOR_FR (fs, 15, 43);
+	  UPDATE_FS_FOR_FR (fs, 16, 44);
+	  UPDATE_FS_FOR_FR (fs, 17, 45);
+	  UPDATE_FS_FOR_FR (fs, 18, 46);
+	  UPDATE_FS_FOR_FR (fs, 19, 47);
+	  UPDATE_FS_FOR_FR (fs, 20, 48);
+	  UPDATE_FS_FOR_FR (fs, 21, 49);
+	  UPDATE_FS_FOR_FR (fs, 22, 50);
+	  UPDATE_FS_FOR_FR (fs, 23, 51);
+	  UPDATE_FS_FOR_FR (fs, 24, 52);
+	  UPDATE_FS_FOR_FR (fs, 25, 53);
+	  UPDATE_FS_FOR_FR (fs, 26, 54);
+	  UPDATE_FS_FOR_FR (fs, 27, 55);
+	  UPDATE_FS_FOR_FR (fs, 28, 56);
+	  UPDATE_FS_FOR_FR (fs, 29, 57);
+	  UPDATE_FS_FOR_FR (fs, 30, 58);
+	  UPDATE_FS_FOR_FR (fs, 31, 59);
+
+	  UPDATE_FS_FOR_SAR (fs, 60);
+	}
+      else
+	{
+	  UPDATE_FS_FOR_FR (fs, 4, 32);
+	  UPDATE_FS_FOR_FR (fs, 5, 34);
+	  UPDATE_FS_FOR_FR (fs, 6, 36);
+	  UPDATE_FS_FOR_FR (fs, 7, 38);
+	  UPDATE_FS_FOR_FR (fs, 8, 40);
+	  UPDATE_FS_FOR_FR (fs, 9, 44);
+	  UPDATE_FS_FOR_FR (fs, 10, 44);
+	  UPDATE_FS_FOR_FR (fs, 11, 46);
+	  UPDATE_FS_FOR_FR (fs, 12, 48);
+	  UPDATE_FS_FOR_FR (fs, 13, 50);
+	  UPDATE_FS_FOR_FR (fs, 14, 52);
+	  UPDATE_FS_FOR_FR (fs, 15, 54);
+
+	  if (!cpu)
+	    cpu = sysconf (_SC_CPU_VERSION);
+
+	  /* PA-RISC 1.0 only has 16 floating point registers.  */
+	  if (cpu != CPU_PA_RISC1_0)
+	    {
+	      UPDATE_FS_FOR_FR (fs, 16, 56);
+	      UPDATE_FS_FOR_FR (fs, 17, 58);
+	      UPDATE_FS_FOR_FR (fs, 18, 60);
+	      UPDATE_FS_FOR_FR (fs, 19, 62);
+	      UPDATE_FS_FOR_FR (fs, 20, 64);
+	      UPDATE_FS_FOR_FR (fs, 21, 66);
+	      UPDATE_FS_FOR_FR (fs, 22, 68);
+	      UPDATE_FS_FOR_FR (fs, 23, 70);
+	      UPDATE_FS_FOR_FR (fs, 24, 72);
+	      UPDATE_FS_FOR_FR (fs, 25, 74);
+	      UPDATE_FS_FOR_FR (fs, 26, 76);
+	      UPDATE_FS_FOR_FR (fs, 27, 78);
+	      UPDATE_FS_FOR_FR (fs, 28, 80);
+	      UPDATE_FS_FOR_FR (fs, 29, 82);
+	      UPDATE_FS_FOR_FR (fs, 30, 84);
+	      UPDATE_FS_FOR_FR (fs, 31, 86);
+	    }
+
+	  UPDATE_FS_FOR_SAR (fs, 88);
+	}
+
+      fs->retaddr_column = DWARF_ALT_FRAME_RETURN_COLUMN;
+      UPDATE_FS_FOR_PC (fs, DWARF_ALT_FRAME_RETURN_COLUMN);
+      fs->signal_frame = 1;
+
+      return _URC_NO_REASON;
+    }
+
+  return _URC_END_OF_STACK;
+}
+#endif /* inhibit_libc */
diff --git a/libgcc/config/pa/linux-unwind.h b/libgcc/config/pa/linux-unwind.h
new file mode 100644
index 00000000000..a0560e97445
--- /dev/null
+++ b/libgcc/config/pa/linux-unwind.h
@@ -0,0 +1,141 @@
+/* DWARF2 EH unwinding support for PA Linux.
+   Copyright (C) 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.  */
+
+/* Don't use this if inhibit_libc is set.
+   The build for this target will fail trying to include missing headers. */
+#ifndef inhibit_libc
+#include <signal.h>
+#include <sys/ucontext.h>
+
+/* Unfortunately, because of various bugs and changes to the kernel,
+   we have several cases to deal with.
+
+   In 2.4, the signal trampoline is 4 words, and (CONTEXT)->ra should
+   point directly at the beginning of the trampoline and struct rt_sigframe.
+
+   In <= 2.6.5-rc2-pa3, the signal trampoline is 9 words, and 
+   (CONTEXT)->ra points at the 4th word in the trampoline structure.  This 
+   is wrong, it should point at the 5th word.  This is fixed in 2.6.5-rc2-pa4.
+
+   To detect these cases, we first take (CONTEXT)->ra, align it to 64-bytes
+   to get the beginning of the signal frame, and then check offsets 0, 4
+   and 5 to see if we found the beginning of the trampoline.  This will
+   tell us how to locate the sigcontext structure.
+
+   Note that with a 2.4 64-bit kernel, the signal context is not properly
+   passed back to userspace so the unwind will not work correctly.  */
+
+#define MD_FALLBACK_FRAME_STATE_FOR pa32_fallback_frame_state
+
+static _Unwind_Reason_Code
+pa32_fallback_frame_state (struct _Unwind_Context *context,
+			   _Unwind_FrameState *fs)
+{
+  unsigned long sp = (unsigned long)context->ra & ~63;
+  unsigned int *pc = (unsigned int *)sp;
+  unsigned long off;
+  _Unwind_Ptr new_cfa;
+  int i;
+  struct sigcontext *sc;
+  struct rt_sigframe {
+    struct siginfo info;
+    struct ucontext uc;
+  } *frame;
+
+  /* rt_sigreturn trampoline:
+     3419000x ldi 0, %r25 or ldi 1, %r25   (x = 0 or 2)
+     3414015a ldi __NR_rt_sigreturn, %r20
+     e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31
+     08000240 nop  */
+
+  if (pc[0] == 0x34190000 || pc[0] == 0x34190002)
+    off = 4*4;
+  else if (pc[4] == 0x34190000 || pc[4] == 0x34190002)
+    {
+      pc += 4;
+      off = 10 * 4;
+    }
+  else if (pc[5] == 0x34190000 || pc[5] == 0x34190002)
+    {
+      pc += 5;
+      off = 10 * 4;
+    }
+  else
+    {
+      /* We may have to unwind through an alternate signal stack.
+	 We assume that the alignment of the alternate signal stack
+	 is BIGGEST_ALIGNMENT (i.e., that it has been allocated using
+	 malloc).  As a result, we can't distinguish trampolines
+	 used prior to 2.6.5-rc2-pa4.  However after 2.6.5-rc2-pa4,
+	 the return address of a signal trampoline will be on an odd
+	 word boundary and we can then determine the frame offset.  */
+      sp = (unsigned long)context->ra;
+      pc = (unsigned int *)sp;
+      if ((pc[0] == 0x34190000 || pc[0] == 0x34190002) && (sp & 4))
+	off = 5 * 4;
+      else
+	return _URC_END_OF_STACK;
+    }
+
+  if (pc[1] != 0x3414015a
+      || pc[2] != 0xe4008200
+      || pc[3] != 0x08000240)
+    return _URC_END_OF_STACK;
+
+  frame = (struct rt_sigframe *)(sp + off);
+  sc = &frame->uc.uc_mcontext;
+
+  new_cfa = sc->sc_gr[30];
+  fs->regs.cfa_how = CFA_REG_OFFSET;
+  fs->regs.cfa_reg = 30;
+  fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+  for (i = 1; i <= 31; i++)
+    {
+      fs->regs.reg[i].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i].loc.offset = (long)&sc->sc_gr[i] - new_cfa;
+    }
+  for (i = 4; i <= 31; i++)
+    {
+      /* FP regs have left and right halves */
+      fs->regs.reg[2*i+24].how = REG_SAVED_OFFSET;
+      fs->regs.reg[2*i+24].loc.offset
+	= (long)&sc->sc_fr[i] - new_cfa;
+      fs->regs.reg[2*i+24+1].how = REG_SAVED_OFFSET;
+      fs->regs.reg[2*i+24+1].loc.offset
+	= (long)&sc->sc_fr[i] + 4 - new_cfa;
+    }
+  fs->regs.reg[88].how = REG_SAVED_OFFSET;
+  fs->regs.reg[88].loc.offset = (long) &sc->sc_sar - new_cfa;
+  fs->regs.reg[DWARF_ALT_FRAME_RETURN_COLUMN].how = REG_SAVED_OFFSET;
+  fs->regs.reg[DWARF_ALT_FRAME_RETURN_COLUMN].loc.offset
+    = (long) &sc->sc_iaoq[0] - new_cfa;
+  fs->retaddr_column = DWARF_ALT_FRAME_RETURN_COLUMN;
+  fs->signal_frame = 1;
+  return _URC_NO_REASON;
+}
+#endif /* inhibit_libc */