From 93d42b302eb91d758191675dcaf3bd90323b5224 Mon Sep 17 00:00:00 2001
From: Daniel Jacobowitz <drow@false.org>
Date: Tue, 27 Feb 2007 20:17:19 +0000
Subject: [PATCH] 	* dwarf2-frame.c (dwarf2_frame_cache,
 dwarf2_frame_this_id) 	(dwarf2_frame_sniffer): Update. 
 (dwarf2_signal_frame_this_id): New function. 	(dwarf2_signal_frame_unwind):
 Use it. 	(dwarf2_frame_base_sniffer): Use
 frame_unwind_address_in_block. 	* frame.c (frame_func_unwind): Add
 this_type argument. 	(get_frame_func): Update. 
 (frame_unwind_address_in_block): Add this_type argument and check it. 	Fix a
 typo. 	(get_frame_address_in_block): Update. 	* frame.h (enum frame_type):
 Move higher in the file. 	(frame_unwind_address_in_block,
 frame_func_unwind): Add enum frame_type 	argument.

	* alpha-mdebug-tdep.c, alpha-tdep.c, amd64-tdep.c, amd64obsd-tdep.c,
	arm-tdep.c, avr-tdep.c, cris-tdep.c, frv-tdep.c, h8300-tdep.c,
	hppa-tdep.c, i386-tdep.c, i386obsd-tdep.c, ia64-tdep.c,
	libunwind-frame.c, m32c-tdep.c, m32r-linux-tdep.c, m32r-tdep.c,
	m68hc11-tdep.c, m68k-tdep.c, m88k-tdep.c, mips-mdebug-tdep.c,
	mips-tdep.c, mn10300-tdep.c, mt-tdep.c, rs6000-tdep.c, s390-tdep.c,
	score-tdep.c, sh-tdep.c, sh64-tdep.c, sparc-tdep.c,
	sparc64obsd-tdep.c, spu-tdep.c, v850-tdep.c, vax-tdep.c,
	xstormy16-tdep.c, xtensa-tdep.c: Update calls to
	frame_func_unwind and frame_unwind_address_in_block to specify
	the frame type.  Use frame_unwind_address_in_block instead of
	frame_pc_unwind in sniffers.

	* gdb.arch/i386-signal.c, gdb.arch/i386-signal.exp: New files.
---
 gdb/ChangeLog                          | 29 ++++++++++++++
 gdb/alpha-mdebug-tdep.c                |  7 ++--
 gdb/alpha-tdep.c                       |  2 +-
 gdb/amd64-tdep.c                       |  2 +-
 gdb/amd64obsd-tdep.c                   |  4 +-
 gdb/arm-tdep.c                         |  6 ++-
 gdb/avr-tdep.c                         |  4 +-
 gdb/cris-tdep.c                        |  8 ++--
 gdb/dwarf2-frame.c                     | 34 ++++++++++++----
 gdb/frame.c                            | 26 ++++++++----
 gdb/frame.h                            | 51 +++++++++++++++---------
 gdb/frv-tdep.c                         |  5 ++-
 gdb/h8300-tdep.c                       |  2 +-
 gdb/hppa-tdep.c                        | 23 +++++++----
 gdb/i386-tdep.c                        |  2 +-
 gdb/i386obsd-tdep.c                    |  4 +-
 gdb/ia64-tdep.c                        |  2 +-
 gdb/libunwind-frame.c                  |  5 ++-
 gdb/m32c-tdep.c                        |  5 ++-
 gdb/m32r-linux-tdep.c                  |  2 +-
 gdb/m32r-tdep.c                        |  4 +-
 gdb/m68hc11-tdep.c                     |  4 +-
 gdb/m68k-tdep.c                        |  2 +-
 gdb/m88k-tdep.c                        |  7 +---
 gdb/mips-mdebug-tdep.c                 |  5 ++-
 gdb/mips-tdep.c                        | 12 +++---
 gdb/mn10300-tdep.c                     |  9 +++--
 gdb/mt-tdep.c                          |  9 ++---
 gdb/rs6000-tdep.c                      |  5 ++-
 gdb/s390-tdep.c                        |  9 +++--
 gdb/score-tdep.c                       |  3 +-
 gdb/sh-tdep.c                          |  2 +-
 gdb/sh64-tdep.c                        |  2 +-
 gdb/sparc-tdep.c                       |  9 ++---
 gdb/sparc64obsd-tdep.c                 |  8 ++--
 gdb/spu-tdep.c                         |  2 +-
 gdb/testsuite/ChangeLog                |  4 ++
 gdb/testsuite/gdb.arch/i386-signal.c   | 55 ++++++++++++++++++++++++++
 gdb/testsuite/gdb.arch/i386-signal.exp | 43 ++++++++++++++++++++
 gdb/v850-tdep.c                        |  2 +-
 gdb/vax-tdep.c                         |  3 +-
 gdb/xstormy16-tdep.c                   |  2 +-
 gdb/xtensa-tdep.c                      |  2 +-
 43 files changed, 314 insertions(+), 112 deletions(-)
 create mode 100644 gdb/testsuite/gdb.arch/i386-signal.c
 create mode 100644 gdb/testsuite/gdb.arch/i386-signal.exp

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a95a673139..2112c9c947 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,32 @@
+2007-02-27  Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* dwarf2-frame.c (dwarf2_frame_cache, dwarf2_frame_this_id)
+	(dwarf2_frame_sniffer): Update.
+	(dwarf2_signal_frame_this_id): New function.
+	(dwarf2_signal_frame_unwind): Use it.
+	(dwarf2_frame_base_sniffer): Use frame_unwind_address_in_block.
+	* frame.c (frame_func_unwind): Add this_type argument.
+	(get_frame_func): Update.
+	(frame_unwind_address_in_block): Add this_type argument and check it.
+	Fix a typo.
+	(get_frame_address_in_block): Update.
+	* frame.h (enum frame_type): Move higher in the file.
+	(frame_unwind_address_in_block, frame_func_unwind): Add enum frame_type
+	argument.
+
+	* alpha-mdebug-tdep.c, alpha-tdep.c, amd64-tdep.c, amd64obsd-tdep.c,
+	arm-tdep.c, avr-tdep.c, cris-tdep.c, frv-tdep.c, h8300-tdep.c,
+	hppa-tdep.c, i386-tdep.c, i386obsd-tdep.c, ia64-tdep.c,
+	libunwind-frame.c, m32c-tdep.c, m32r-linux-tdep.c, m32r-tdep.c,
+	m68hc11-tdep.c, m68k-tdep.c, m88k-tdep.c, mips-mdebug-tdep.c,
+	mips-tdep.c, mn10300-tdep.c, mt-tdep.c, rs6000-tdep.c, s390-tdep.c,
+	score-tdep.c, sh-tdep.c, sh64-tdep.c, sparc-tdep.c,
+	sparc64obsd-tdep.c, spu-tdep.c, v850-tdep.c, vax-tdep.c,
+	xstormy16-tdep.c, xtensa-tdep.c: Update calls to
+	frame_func_unwind and frame_unwind_address_in_block to specify
+	the frame type.  Use frame_unwind_address_in_block instead of
+	frame_pc_unwind in sniffers.
+
 2007-02-27  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* frame.c (deprecated_selected_frame): Rename to...
diff --git a/gdb/alpha-mdebug-tdep.c b/gdb/alpha-mdebug-tdep.c
index c2f180251b..59bb47f6d9 100644
--- a/gdb/alpha-mdebug-tdep.c
+++ b/gdb/alpha-mdebug-tdep.c
@@ -246,7 +246,8 @@ alpha_mdebug_frame_this_id (struct frame_info *next_frame,
   struct alpha_mdebug_unwind_cache *info
     = alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
 
-  *this_id = frame_id_build (info->vfp, frame_func_unwind (next_frame));
+  *this_id = frame_id_build (info->vfp,
+			     frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 /* Retrieve the value of REGNUM in FRAME.  Don't give up!  */
@@ -311,7 +312,7 @@ static const struct frame_unwind alpha_mdebug_frame_unwind = {
 const struct frame_unwind *
 alpha_mdebug_frame_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   struct mdebug_extra_func_info *proc_desc;
 
   /* If this PC does not map to a PDR, then clearly this isn't an
@@ -368,7 +369,7 @@ static const struct frame_base alpha_mdebug_frame_base = {
 static const struct frame_base *
 alpha_mdebug_frame_base_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   struct mdebug_extra_func_info *proc_desc;
 
   /* If this PC does not map to a PDR, then clearly this isn't an
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index b0bc35b3aa..83e95a1a1f 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -820,7 +820,7 @@ alpha_sigtramp_frame_this_id (struct frame_info *next_frame,
 	code_addr = 0;
     }
   else
-    code_addr = frame_func_unwind (next_frame);
+    code_addr = frame_func_unwind (next_frame, SIGTRAMP_FRAME);
 
   /* The stack address is trivially read from the sigcontext.  */
   stack_addr = alpha_sigtramp_register_address (info->sigcontext_addr,
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 3b5a1959d5..8c3e887ae2 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -833,7 +833,7 @@ amd64_frame_cache (struct frame_info *next_frame, void **this_cache)
   cache = amd64_alloc_frame_cache ();
   *this_cache = cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
     amd64_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
 
diff --git a/gdb/amd64obsd-tdep.c b/gdb/amd64obsd-tdep.c
index 7bca4d753d..4e412e9ea1 100644
--- a/gdb/amd64obsd-tdep.c
+++ b/gdb/amd64obsd-tdep.c
@@ -356,7 +356,9 @@ amd64obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
   cache = trad_frame_cache_zalloc (next_frame);
   *this_cache = cache;
 
-  func = frame_func_unwind (next_frame);
+  /* NORMAL_FRAME matches the type in amd64obsd_trapframe_unwind, but
+     SIGTRAMP_FRAME might be more appropriate.  */
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
   sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
 
   find_pc_partial_function (func, &name, NULL, NULL);
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 869cc3469b..19afdac04a 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -931,7 +931,7 @@ arm_prologue_this_id (struct frame_info *next_frame,
     *this_cache = arm_make_prologue_cache (next_frame);
   cache = *this_cache;
 
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* This is meant to halt the backtrace at "_start".  Make sure we
      don't halt it at a generic dummy frame. */
@@ -1036,9 +1036,11 @@ struct frame_unwind arm_stub_unwind = {
 static const struct frame_unwind *
 arm_stub_unwind_sniffer (struct frame_info *next_frame)
 {
+  CORE_ADDR addr_in_block;
   char dummy[4];
 
-  if (in_plt_section (frame_unwind_address_in_block (next_frame), NULL)
+  addr_in_block = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
+  if (in_plt_section (addr_in_block, NULL)
       || target_read_memory (frame_pc_unwind (next_frame), dummy, 4) != 0)
     return &arm_stub_unwind;
 
diff --git a/gdb/avr-tdep.c b/gdb/avr-tdep.c
index 4724f65f5f..9f0793e2fb 100644
--- a/gdb/avr-tdep.c
+++ b/gdb/avr-tdep.c
@@ -875,7 +875,7 @@ avr_frame_unwind_cache (struct frame_info *next_frame,
   info->size = 0;
   info->prologue_type = AVR_PROLOGUE_NONE;
 
-  pc = frame_func_unwind (next_frame);
+  pc = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   if ((pc > 0) && (pc < frame_pc_unwind (next_frame)))
     avr_scan_prologue (pc, info);
@@ -958,7 +958,7 @@ avr_frame_this_id (struct frame_info *next_frame,
   struct frame_id id;
 
   /* The FUNC is easy.  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Hopefully the prologue analysis either correctly determined the
      frame's base (which is the SP from the previous frame), or set
diff --git a/gdb/cris-tdep.c b/gdb/cris-tdep.c
index 862a4a5eff..6175123b92 100644
--- a/gdb/cris-tdep.c
+++ b/gdb/cris-tdep.c
@@ -792,9 +792,11 @@ cris_frame_unwind_cache (struct frame_info *next_frame,
 
   /* Prologue analysis does the rest...  */
   if (cris_version () == 32)
-    crisv32_scan_prologue (frame_func_unwind (next_frame), next_frame, info);
+    crisv32_scan_prologue (frame_func_unwind (next_frame, NORMAL_FRAME),
+			   next_frame, info);
   else
-    cris_scan_prologue (frame_func_unwind (next_frame), next_frame, info);
+    cris_scan_prologue (frame_func_unwind (next_frame, NORMAL_FRAME),
+			next_frame, info);
 
   return info;
 }
@@ -814,7 +816,7 @@ cris_frame_this_id (struct frame_info *next_frame,
   struct frame_id id;
 
   /* The FUNC is easy.  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Hopefully the prologue analysis either correctly determined the
      frame's base (which is the SP from the previous frame), or set
diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index fd4002c476..be61a0eca8 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -848,7 +848,7 @@ dwarf2_frame_cache (struct frame_info *next_frame, void **this_cache)
      frame_unwind_address_in_block does just this.  It's not clear how
      reliable the method is though; there is the potential for the
      register state pre-call being different to that on return.  */
-  fs->pc = frame_unwind_address_in_block (next_frame);
+  fs->pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
 
   /* Find the correct FDE.  */
   fde = dwarf2_frame_find_fde (&fs->pc);
@@ -1011,7 +1011,22 @@ dwarf2_frame_this_id (struct frame_info *next_frame, void **this_cache,
   if (cache->undefined_retaddr)
     return;
 
-  (*this_id) = frame_id_build (cache->cfa, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (cache->cfa,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
+}
+
+static void
+dwarf2_signal_frame_this_id (struct frame_info *next_frame, void **this_cache,
+			     struct frame_id *this_id)
+{
+  struct dwarf2_frame_cache *cache =
+    dwarf2_frame_cache (next_frame, this_cache);
+
+  if (cache->undefined_retaddr)
+    return;
+
+  (*this_id) = frame_id_build (cache->cfa,
+			       frame_func_unwind (next_frame, SIGTRAMP_FRAME));
 }
 
 static void
@@ -1179,7 +1194,7 @@ static const struct frame_unwind dwarf2_frame_unwind =
 static const struct frame_unwind dwarf2_signal_frame_unwind =
 {
   SIGTRAMP_FRAME,
-  dwarf2_frame_this_id,
+  dwarf2_signal_frame_this_id,
   dwarf2_frame_prev_register
 };
 
@@ -1188,8 +1203,12 @@ dwarf2_frame_sniffer (struct frame_info *next_frame)
 {
   /* Grab an address that is guarenteed to reside somewhere within the
      function.  frame_pc_unwind(), for a no-return next function, can
-     end up returning something past the end of this function's body.  */
-  CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
+     end up returning something past the end of this function's body.
+     If the frame we're sniffing for is a signal frame whose start
+     address is placed on the stack by the OS, its FDE must
+     extend one byte before its start address or we will miss it.  */
+  CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame,
+							NORMAL_FRAME);
   struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr);
   if (!fde)
     return NULL;
@@ -1233,8 +1252,9 @@ static const struct frame_base dwarf2_frame_base =
 const struct frame_base *
 dwarf2_frame_base_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
-  if (dwarf2_frame_find_fde (&pc))
+  CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame,
+							NORMAL_FRAME);
+  if (dwarf2_frame_find_fde (&block_addr))
     return &dwarf2_frame_base;
 
   return NULL;
diff --git a/gdb/frame.c b/gdb/frame.c
index e84371c4a4..ff8078bf26 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -471,13 +471,13 @@ frame_pc_unwind (struct frame_info *this_frame)
 }
 
 CORE_ADDR
-frame_func_unwind (struct frame_info *fi)
+frame_func_unwind (struct frame_info *fi, enum frame_type this_type)
 {
   if (!fi->prev_func.p)
     {
       /* Make certain that this, and not the adjacent, function is
          found.  */
-      CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi);
+      CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi, this_type);
       fi->prev_func.p = 1;
       fi->prev_func.addr = get_pc_function_start (addr_in_block);
       if (frame_debug)
@@ -491,7 +491,7 @@ frame_func_unwind (struct frame_info *fi)
 CORE_ADDR
 get_frame_func (struct frame_info *fi)
 {
-  return frame_func_unwind (fi->next);
+  return frame_func_unwind (fi->next, get_frame_type (fi));
 }
 
 static int
@@ -1496,20 +1496,31 @@ get_frame_pc (struct frame_info *frame)
   return frame_pc_unwind (frame->next);
 }
 
-/* Return an address of that falls within the frame's code block.  */
+/* Return an address that falls within NEXT_FRAME's caller's code
+   block, assuming that the caller is a THIS_TYPE frame.  */
 
 CORE_ADDR
-frame_unwind_address_in_block (struct frame_info *next_frame)
+frame_unwind_address_in_block (struct frame_info *next_frame,
+			       enum frame_type this_type)
 {
   /* A draft address.  */
   CORE_ADDR pc = frame_pc_unwind (next_frame);
 
+  /* If NEXT_FRAME was called by a signal frame or dummy frame, then
+     we shold not adjust the unwound PC.  These frames may not call
+     their next frame in the normal way; the operating system or GDB
+     may have pushed their resume address manually onto the stack, so
+     it may be the very first instruction.  Even if the resume address
+     was not manually pushed, they expect to be returned to.  */
+  if (this_type != NORMAL_FRAME)
+    return pc;
+
   /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel),
      and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS
      frame's PC ends up pointing at the instruction fallowing the
      "call".  Adjust that PC value so that it falls on the call
      instruction (which, hopefully, falls within THIS frame's code
-     block.  So far it's proved to be a very good approximation.  See
+     block).  So far it's proved to be a very good approximation.  See
      get_frame_type() for why ->type can't be used.  */
   if (next_frame->level >= 0
       && get_frame_type (next_frame) == NORMAL_FRAME)
@@ -1520,7 +1531,8 @@ frame_unwind_address_in_block (struct frame_info *next_frame)
 CORE_ADDR
 get_frame_address_in_block (struct frame_info *this_frame)
 {
-  return frame_unwind_address_in_block (this_frame->next);
+  return frame_unwind_address_in_block (this_frame->next,
+					get_frame_type (this_frame));
 }
 
 static int
diff --git a/gdb/frame.h b/gdb/frame.h
index bce43ed206..941ee73ef5 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -184,6 +184,25 @@ extern int frame_id_inner (struct frame_id l, struct frame_id r);
 extern void fprint_frame_id (struct ui_file *file, struct frame_id id);
 
 
+/* Frame types.  Some are real, some are signal trampolines, and some
+   are completely artificial (dummy).  */
+
+enum frame_type
+{
+  /* A true stack frame, created by the target program during normal
+     execution.  */
+  NORMAL_FRAME,
+  /* A fake frame, created by GDB when performing an inferior function
+     call.  */
+  DUMMY_FRAME,
+  /* In a signal handler, various OSs handle this in various ways.
+     The main thing is that the frame may be far from normal.  */
+  SIGTRAMP_FRAME,
+  /* Sentinel or registers frame.  This frame obtains register values
+     direct from the inferior's registers.  */
+  SENTINEL_FRAME
+};
+
 /* For every stopped thread, GDB tracks two frames: current and
    selected.  Current frame is the inner most frame of the selected
    thread.  Selected frame is the one being examined by the the GDB
@@ -265,7 +284,13 @@ extern CORE_ADDR get_frame_pc (struct frame_info *);
    the frame's block.  */
 
 extern CORE_ADDR get_frame_address_in_block (struct frame_info *this_frame);
-extern CORE_ADDR frame_unwind_address_in_block (struct frame_info *next_frame);
+
+/* Similar to get_frame_address_in_block, find an address in the
+   block which logically called NEXT_FRAME, assuming it is a THIS_TYPE
+   frame.  */
+
+extern CORE_ADDR frame_unwind_address_in_block (struct frame_info *next_frame,
+						enum frame_type this_type);
 
 /* The frame's inner-most bound.  AKA the stack-pointer.  Confusingly
    known as top-of-stack.  */
@@ -277,9 +302,13 @@ extern CORE_ADDR frame_sp_unwind (struct frame_info *);
 /* Following on from the `resume' address.  Return the entry point
    address of the function containing that resume address, or zero if
    that function isn't known.  */
-extern CORE_ADDR frame_func_unwind (struct frame_info *fi);
 extern CORE_ADDR get_frame_func (struct frame_info *fi);
 
+/* Similar to get_frame_func, find the start of the function which
+   logically called NEXT_FRAME, assuming it is a THIS_TYPE frame.  */
+extern CORE_ADDR frame_func_unwind (struct frame_info *next_frame,
+				    enum frame_type this_type);
+
 /* Closely related to the resume address, various symbol table
    attributes that are determined by the PC.  Note that for a normal
    frame, the PC refers to the resume address after the return, and
@@ -375,24 +404,8 @@ extern CORE_ADDR get_frame_args_address (struct frame_info *);
    for an invalid frame).  */
 extern int frame_relative_level (struct frame_info *fi);
 
-/* Return the frame's type.  Some are real, some are signal
-   trampolines, and some are completely artificial (dummy).  */
+/* Return the frame's type.  */
 
-enum frame_type
-{
-  /* A true stack frame, created by the target program during normal
-     execution.  */
-  NORMAL_FRAME,
-  /* A fake frame, created by GDB when performing an inferior function
-     call.  */
-  DUMMY_FRAME,
-  /* In a signal handler, various OSs handle this in various ways.
-     The main thing is that the frame may be far from normal.  */
-  SIGTRAMP_FRAME,
-  /* Sentinel or registers frame.  This frame obtains register values
-     direct from the inferior's registers.  */
-  SENTINEL_FRAME
-};
 extern enum frame_type get_frame_type (struct frame_info *);
 
 /* For frames where we can not unwind further, describe why.  */
diff --git a/gdb/frv-tdep.c b/gdb/frv-tdep.c
index 4945712c4a..351011a5eb 100644
--- a/gdb/frv-tdep.c
+++ b/gdb/frv-tdep.c
@@ -1016,7 +1016,8 @@ frv_frame_unwind_cache (struct frame_info *next_frame,
   info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
 
   /* Prologue analysis does the rest...  */
-  frv_analyze_prologue (frame_func_unwind (next_frame), next_frame, info);
+  frv_analyze_prologue (frame_func_unwind (next_frame, NORMAL_FRAME),
+			next_frame, info);
 
   return info;
 }
@@ -1346,7 +1347,7 @@ frv_frame_this_id (struct frame_info *next_frame,
   struct frame_id id;
 
   /* The FUNC is easy.  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Check if the stack is empty.  */
   msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL);
diff --git a/gdb/h8300-tdep.c b/gdb/h8300-tdep.c
index f5a8e4df16..8e817b1adc 100644
--- a/gdb/h8300-tdep.c
+++ b/gdb/h8300-tdep.c
@@ -447,7 +447,7 @@ h8300_frame_cache (struct frame_info *next_frame, void **this_cache)
 
   cache->saved_regs[E_PC_REGNUM] = -BINWORD;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   current_pc = frame_pc_unwind (next_frame);
   if (cache->pc != 0)
     h8300_analyze_prologue (cache->pc, current_pc, cache);
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c
index 060eb13181..382c712088 100644
--- a/gdb/hppa-tdep.c
+++ b/gdb/hppa-tdep.c
@@ -1787,9 +1787,14 @@ hppa_skip_prologue (CORE_ADDR pc)
 static struct unwind_table_entry *
 hppa_find_unwind_entry_in_block (struct frame_info *f)
 {
-  CORE_ADDR pc;
-
-  pc = frame_unwind_address_in_block (f);
+  CORE_ADDR pc = frame_unwind_address_in_block (f, NORMAL_FRAME);
+
+  /* FIXME drow/20070101: Calling gdbarch_addr_bits_remove on the
+     result of frame_unwind_address_in_block implies a problem.
+     The bits should have been removed earlier, before the return
+     value of frame_pc_unwind.  That might be happening already;
+     if it isn't, it should be fixed.  Then this call can be
+     removed.  */
   pc = gdbarch_addr_bits_remove (get_frame_arch (f), pc);
   return find_unwind_entry (pc);
 }
@@ -1899,7 +1904,7 @@ hppa_frame_cache (struct frame_info *next_frame, void **this_cache)
     if ((u->Region_description & 0x2) == 0)
       start_pc = u->region_start;
     else
-      start_pc = frame_func_unwind (next_frame);
+      start_pc = frame_func_unwind (next_frame, NORMAL_FRAME);
 
     prologue_end = skip_prologue_hard_way (start_pc, 0);
     end_pc = frame_pc_unwind (next_frame);
@@ -2267,7 +2272,7 @@ hppa_fallback_frame_cache (struct frame_info *next_frame, void **this_cache)
   (*this_cache) = cache;
   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
 
-  start_pc = frame_func_unwind (next_frame);
+  start_pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (start_pc)
     {
       CORE_ADDR cur_pc = frame_pc_unwind (next_frame);
@@ -2326,7 +2331,8 @@ hppa_fallback_frame_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct hppa_frame_cache *info = 
     hppa_fallback_frame_cache (next_frame, this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
@@ -2409,7 +2415,8 @@ hppa_stub_frame_this_id (struct frame_info *next_frame,
     = hppa_stub_frame_unwind_cache (next_frame, this_prologue_cache);
 
   if (info)
-    *this_id = frame_id_build (info->base, frame_func_unwind (next_frame));
+    *this_id = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
   else
     *this_id = null_frame_id;
 }
@@ -2441,7 +2448,7 @@ static const struct frame_unwind hppa_stub_frame_unwind = {
 static const struct frame_unwind *
 hppa_stub_unwind_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   struct gdbarch *gdbarch = get_frame_arch (next_frame);
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index afc7cb23e5..4d9583d345 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -949,7 +949,7 @@ i386_frame_cache (struct frame_info *next_frame, void **this_cache)
   /* For normal frames, %eip is stored at 4(%ebp).  */
   cache->saved_regs[I386_EIP_REGNUM] = 4;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
     i386_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
 
diff --git a/gdb/i386obsd-tdep.c b/gdb/i386obsd-tdep.c
index c3643c7fa8..38058bfeaa 100644
--- a/gdb/i386obsd-tdep.c
+++ b/gdb/i386obsd-tdep.c
@@ -353,7 +353,9 @@ i386obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
   cache = trad_frame_cache_zalloc (next_frame);
   *this_cache = cache;
 
-  func = frame_func_unwind (next_frame);
+  /* NORMAL_FRAME matches the type in i386obsd_trapframe_unwind, but
+     SIGTRAMP_FRAME might be more appropriate.  */
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
   sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
 
   find_pc_partial_function (func, &name, NULL, NULL);
diff --git a/gdb/ia64-tdep.c b/gdb/ia64-tdep.c
index 883d570cc4..98ca406eb5 100644
--- a/gdb/ia64-tdep.c
+++ b/gdb/ia64-tdep.c
@@ -1555,7 +1555,7 @@ ia64_frame_cache (struct frame_info *next_frame, void **this_cache)
 
   cache->cfm = cfm;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   if (cache->pc != 0)
     examine_prologue (cache->pc, frame_pc_unwind (next_frame), next_frame, cache);
diff --git a/gdb/libunwind-frame.c b/gdb/libunwind-frame.c
index 347247a89e..662a87fd11 100644
--- a/gdb/libunwind-frame.c
+++ b/gdb/libunwind-frame.c
@@ -141,7 +141,10 @@ libunwind_frame_cache (struct frame_info *next_frame, void **this_cache)
   /* Allocate a new cache.  */
   cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
 
-  cache->func_addr = frame_func_unwind (next_frame);
+  /* We can assume we are unwinding a normal frame.  Even if this is
+     for a signal trampoline, ia64 signal "trampolines" use a normal
+     subroutine call to start the signal handler.  */
+  cache->func_addr = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->func_addr == 0
       && frame_relative_level (next_frame) > 0
       && get_frame_type (next_frame) != SIGTRAMP_FRAME)
diff --git a/gdb/m32c-tdep.c b/gdb/m32c-tdep.c
index cb8a7add52..91a56cc131 100644
--- a/gdb/m32c-tdep.c
+++ b/gdb/m32c-tdep.c
@@ -1836,7 +1836,7 @@ m32c_analyze_frame_prologue (struct frame_info *next_frame,
 {
   if (! *this_prologue_cache)
     {
-      CORE_ADDR func_start = frame_func_unwind (next_frame);
+      CORE_ADDR func_start = frame_func_unwind (next_frame, NORMAL_FRAME);
       CORE_ADDR stop_addr = frame_pc_unwind (next_frame);
 
       /* If we couldn't find any function containing the PC, then
@@ -1900,7 +1900,8 @@ m32c_this_id (struct frame_info *next_frame,
   CORE_ADDR base = m32c_frame_base (next_frame, this_prologue_cache);
 
   if (base)
-    *this_id = frame_id_build (base, frame_func_unwind (next_frame));
+    *this_id = frame_id_build (base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
   /* Otherwise, leave it unset, and that will terminate the backtrace.  */
 }
 
diff --git a/gdb/m32r-linux-tdep.c b/gdb/m32r-linux-tdep.c
index 427eee4a9d..b1a5de81ba 100644
--- a/gdb/m32r-linux-tdep.c
+++ b/gdb/m32r-linux-tdep.c
@@ -250,7 +250,7 @@ m32r_linux_sigtramp_frame_cache (struct frame_info *next_frame,
       if (addr)
 	sigcontext_addr += 128;
       else
-	addr = frame_func_unwind (next_frame);
+	addr = frame_func_unwind (next_frame, NORMAL_FRAME);
     }
   cache->pc = addr;
 
diff --git a/gdb/m32r-tdep.c b/gdb/m32r-tdep.c
index 9e477f30ad..fa40064f07 100644
--- a/gdb/m32r-tdep.c
+++ b/gdb/m32r-tdep.c
@@ -536,7 +536,7 @@ m32r_frame_unwind_cache (struct frame_info *next_frame,
   info->uses_frame = 0;
 
   scan_limit = frame_pc_unwind (next_frame);
-  for (pc = frame_func_unwind (next_frame);
+  for (pc = frame_func_unwind (next_frame, NORMAL_FRAME);
        pc > 0 && pc < scan_limit; pc += 2)
     {
       if ((pc & 2) == 0)
@@ -835,7 +835,7 @@ m32r_frame_this_id (struct frame_info *next_frame,
   struct frame_id id;
 
   /* The FUNC is easy.  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Check if the stack is empty.  */
   msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL);
diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c
index ba8ab4892b..42c4a25ca8 100644
--- a/gdb/m68hc11-tdep.c
+++ b/gdb/m68hc11-tdep.c
@@ -798,7 +798,7 @@ m68hc11_frame_unwind_cache (struct frame_info *next_frame,
   (*this_prologue_cache) = info;
   info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
 
-  info->pc = frame_func_unwind (next_frame);
+  info->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   info->size = 0;
   info->return_kind = m68hc11_get_return_insn (info->pc);
@@ -889,7 +889,7 @@ m68hc11_frame_this_id (struct frame_info *next_frame,
   struct frame_id id;
 
   /* The FUNC is easy.  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Hopefully the prologue analysis either correctly determined the
      frame's base (which is the SP from the previous frame), or set
diff --git a/gdb/m68k-tdep.c b/gdb/m68k-tdep.c
index d7c89c2718..90cb169234 100644
--- a/gdb/m68k-tdep.c
+++ b/gdb/m68k-tdep.c
@@ -819,7 +819,7 @@ m68k_frame_cache (struct frame_info *next_frame, void **this_cache)
   /* For normal frames, %pc is stored at 4(%fp).  */
   cache->saved_regs[M68K_PC_REGNUM] = 4;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
     m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
 
diff --git a/gdb/m88k-tdep.c b/gdb/m88k-tdep.c
index 77d1f2331e..c5a5d57050 100644
--- a/gdb/m88k-tdep.c
+++ b/gdb/m88k-tdep.c
@@ -659,12 +659,9 @@ m88k_frame_cache (struct frame_info *next_frame, void **this_cache)
   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
   cache->fp_offset = -1;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
-    {
-      CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
-      m88k_analyze_prologue (cache->pc, addr_in_block, cache);
-    }
+    m88k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
 
   /* Calculate the stack pointer used in the prologue.  */
   if (cache->fp_offset != -1)
diff --git a/gdb/mips-mdebug-tdep.c b/gdb/mips-mdebug-tdep.c
index e7b4d06931..8e029c9949 100644
--- a/gdb/mips-mdebug-tdep.c
+++ b/gdb/mips-mdebug-tdep.c
@@ -386,7 +386,8 @@ mips_mdebug_frame_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame,
 							   this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
@@ -412,7 +413,7 @@ static const struct frame_unwind mips_mdebug_frame_unwind =
 static const struct frame_unwind *
 mips_mdebug_frame_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   CORE_ADDR startaddr = 0;
   struct mdebug_extra_func_info *proc_desc;
   int kernel_trap;
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index f25c8a15bf..c8e958a58c 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -1666,7 +1666,8 @@ mips_insn16_frame_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame,
 							   this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
@@ -1692,7 +1693,7 @@ static const struct frame_unwind mips_insn16_frame_unwind =
 static const struct frame_unwind *
 mips_insn16_frame_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   if (mips_pc_is_mips16 (pc))
     return &mips_insn16_frame_unwind;
   return NULL;
@@ -1986,7 +1987,8 @@ mips_insn32_frame_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame,
 							   this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
@@ -2012,7 +2014,7 @@ static const struct frame_unwind mips_insn32_frame_unwind =
 static const struct frame_unwind *
 mips_insn32_frame_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   if (! mips_pc_is_mips16 (pc))
     return &mips_insn32_frame_unwind;
   return NULL;
@@ -2107,7 +2109,7 @@ static const struct frame_unwind *
 mips_stub_frame_sniffer (struct frame_info *next_frame)
 {
   struct obj_section *s;
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
 
   if (in_plt_section (pc, NULL))
     return &mips_stub_frame_unwind;
diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c
index ac5098a464..d4edd2823c 100644
--- a/gdb/mn10300-tdep.c
+++ b/gdb/mn10300-tdep.c
@@ -850,9 +850,12 @@ mn10300_frame_unwind_cache (struct frame_info *next_frame,
 		       frame_id_build (trad_frame_get_this_base (cache), 
 				       start));
   else
-    trad_frame_set_id (cache, 
-		       frame_id_build (trad_frame_get_this_base (cache), 
-				       frame_func_unwind (next_frame)));
+    {
+      start = frame_func_unwind (next_frame, NORMAL_FRAME);
+      trad_frame_set_id (cache,
+			 frame_id_build (trad_frame_get_this_base (cache),
+					 start));
+    }
 
   (*this_prologue_cache) = cache;
   return cache;
diff --git a/gdb/mt-tdep.c b/gdb/mt-tdep.c
index baaa4fa225..b9b865330a 100644
--- a/gdb/mt-tdep.c
+++ b/gdb/mt-tdep.c
@@ -891,7 +891,7 @@ mt_frame_unwind_cache (struct frame_info *next_frame,
   frame_unwind_unsigned_register (next_frame, MT_SP_REGNUM, &sp);
   frame_unwind_unsigned_register (next_frame, MT_FP_REGNUM, &fp);
 
-  start_addr = frame_func_unwind (next_frame);
+  start_addr = frame_func_unwind (next_frame, NORMAL_FRAME);
 
   /* Return early if GDB couldn't find the function.  */
   if (start_addr == 0)
@@ -1041,10 +1041,9 @@ mt_frame_this_id (struct frame_info *next_frame,
     mt_frame_unwind_cache (next_frame, this_prologue_cache);
 
   if (!(info == NULL || info->prev_sp == 0))
-    {
-      (*this_id) = frame_id_build (info->prev_sp,
-				   frame_func_unwind (next_frame));
-    }
+    (*this_id) = frame_id_build (info->prev_sp,
+				 frame_func_unwind (next_frame, NORMAL_FRAME));
+
   return;
 }
 
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index e107114f93..6e358876dc 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -2977,7 +2977,7 @@ rs6000_frame_cache (struct frame_info *next_frame, void **this_cache)
   (*this_cache) = cache;
   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
 
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
   pc = frame_pc_unwind (next_frame);
   skip_prologue (func, pc, &fdata);
 
@@ -3129,7 +3129,8 @@ rs6000_frame_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct rs6000_frame_cache *info = rs6000_frame_cache (next_frame,
 							this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 08a032a883..395c57e7b1 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -1232,7 +1232,7 @@ s390_prologue_frame_unwind_cache (struct frame_info *next_frame,
      bother searching for it -- with modern compilers this would be mostly
      pointless anyway.  Trust that we'll either have valid DWARF-2 CFI data
      or else a valid backchain ...  */
-  func = frame_func_unwind (next_frame);
+  func = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (!func)
     return 0;
 
@@ -1556,14 +1556,15 @@ static const struct frame_unwind s390_stub_frame_unwind = {
 static const struct frame_unwind *
 s390_stub_frame_sniffer (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR addr_in_block;
   bfd_byte insn[S390_MAX_INSTR_SIZE];
 
   /* If the current PC points to non-readable memory, we assume we
      have trapped due to an invalid function pointer call.  We handle
      the non-existing current function like a PLT stub.  */
-  if (in_plt_section (pc, NULL)
-      || s390_readinstruction (insn, pc) < 0)
+  addr_in_block = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
+  if (in_plt_section (addr_in_block, NULL)
+      || s390_readinstruction (insn, frame_pc_unwind (next_frame)) < 0)
     return &s390_stub_frame_unwind;
   return NULL;
 }
diff --git a/gdb/score-tdep.c b/gdb/score-tdep.c
index 300e775c48..d739333a70 100644
--- a/gdb/score-tdep.c
+++ b/gdb/score-tdep.c
@@ -801,7 +801,8 @@ score_prologue_this_id (struct frame_info *next_frame, void **this_cache,
 {
   struct score_frame_cache *info = score_make_prologue_cache (next_frame,
                                                               this_cache);
-  (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (info->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
diff --git a/gdb/sh-tdep.c b/gdb/sh-tdep.c
index 752f64223a..59f374b8ad 100644
--- a/gdb/sh-tdep.c
+++ b/gdb/sh-tdep.c
@@ -2215,7 +2215,7 @@ sh_frame_cache (struct frame_info *next_frame, void **this_cache)
   if (cache->base == 0)
     return cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   current_pc = frame_pc_unwind (next_frame);
   if (cache->pc != 0)
     sh_analyze_prologue (cache->pc, current_pc, cache);
diff --git a/gdb/sh64-tdep.c b/gdb/sh64-tdep.c
index 25eb8932d6..62b68259f2 100644
--- a/gdb/sh64-tdep.c
+++ b/gdb/sh64-tdep.c
@@ -2253,7 +2253,7 @@ sh64_frame_cache (struct frame_info *next_frame, void **this_cache)
   if (cache->base == 0)
     return cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
     sh64_analyze_prologue (current_gdbarch, cache, cache->pc, current_pc);
 
diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index a55687f03f..bbcdb081a2 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -699,12 +699,9 @@ sparc_frame_cache (struct frame_info *next_frame, void **this_cache)
   cache = sparc_alloc_frame_cache ();
   *this_cache = cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (cache->pc != 0)
-    {
-      CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
-      sparc_analyze_prologue (cache->pc, addr_in_block, cache);
-    }
+    sparc_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
 
   if (cache->frameless_p)
     {
@@ -1054,7 +1051,7 @@ sparc32_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
 static int
 sparc32_dwarf2_struct_return_p (struct frame_info *next_frame)
 {
-  CORE_ADDR pc = frame_unwind_address_in_block (next_frame);
+  CORE_ADDR pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
   struct symbol *sym = find_pc_function (pc);
 
   if (sym)
diff --git a/gdb/sparc64obsd-tdep.c b/gdb/sparc64obsd-tdep.c
index 5c205694aa..21f2184240 100644
--- a/gdb/sparc64obsd-tdep.c
+++ b/gdb/sparc64obsd-tdep.c
@@ -205,7 +205,7 @@ sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
 /* Kernel debugging support.  */
 
 static struct sparc_frame_cache *
-sparc64obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
+sparc64obsd_trapframe_cache (struct frame_info *next_frame, void **this_cache)
 {
   struct sparc_frame_cache *cache;
   CORE_ADDR sp, trapframe_addr;
@@ -267,15 +267,17 @@ static const struct frame_unwind sparc64obsd_trapframe_unwind =
 static const struct frame_unwind *
 sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
 {
+  CORE_ADDR pc;
   ULONGEST pstate;
   char *name;
 
   /* Check whether we are in privileged mode, and bail out if we're not.  */
-  pstate = frame_unwind_register_unsigned(next_frame, SPARC64_PSTATE_REGNUM);
+  pstate = frame_unwind_register_unsigned (next_frame, SPARC64_PSTATE_REGNUM);
   if ((pstate & SPARC64_PSTATE_PRIV) == 0)
     return NULL;
 
-  find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL);
+  pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
+  find_pc_partial_function (pc, &name, NULL, NULL);
   if (name && strcmp (name, "Lslowtrap_reenter") == 0)
     return &sparc64obsd_trapframe_unwind;
 
diff --git a/gdb/spu-tdep.c b/gdb/spu-tdep.c
index ef8c1c65c9..f749ecebb1 100644
--- a/gdb/spu-tdep.c
+++ b/gdb/spu-tdep.c
@@ -587,7 +587,7 @@ spu_frame_unwind_cache (struct frame_info *next_frame,
   info->local_base = 0;
 
   /* Find the start of the current function, and analyze its prologue.  */
-  info->func = frame_func_unwind (next_frame);
+  info->func = frame_func_unwind (next_frame, NORMAL_FRAME);
   if (info->func == 0)
     {
       /* Fall back to using the current PC as frame ID.  */
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index b8dc9b3f77..e8f3c820e2 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2007-02-27  Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* gdb.arch/i386-signal.c, gdb.arch/i386-signal.exp: New files.
+
 2007-02-27  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* gdb.base/maint.exp: Remove full paths from test names.
diff --git a/gdb/testsuite/gdb.arch/i386-signal.c b/gdb/testsuite/gdb.arch/i386-signal.c
new file mode 100644
index 0000000000..61be9afb87
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/i386-signal.c
@@ -0,0 +1,55 @@
+/* Unwinder test program for signal frames.
+
+   Copyright 2007 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   
+   This program 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.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+void sigframe (void);
+void setup (void);
+
+void
+func (void)
+{
+}
+
+int
+main (void)
+{
+  setup ();
+}
+
+/* Create an imitation signal frame.  This will work on any x86 or
+   x86-64 target which uses a version of GAS recent enough for
+   .cfi_signal_frame (added 2006-02-27 and included in binutils 2.17).
+   The default CIE created by gas suffices to unwind from an empty
+   function.  */
+
+asm(".text\n"
+    "    .align 8\n"
+    "    .globl setup\n"
+    "setup:\n"
+    "    push $sigframe\n"
+    "    jmp func\n"
+    "\n"
+    "    .cfi_startproc\n"
+    "    .cfi_signal_frame\n"
+    "    nop\n"
+    "    .globl sigframe\n"
+    "sigframe:\n"
+    "    ret\n"
+    "    .cfi_endproc");
diff --git a/gdb/testsuite/gdb.arch/i386-signal.exp b/gdb/testsuite/gdb.arch/i386-signal.exp
new file mode 100644
index 0000000000..66f3860d41
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/i386-signal.exp
@@ -0,0 +1,43 @@
+# Copyright 2007 Free Software Foundation, Inc.
+
+# This file is part of the GDB testsuite.
+
+# This program 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+
+if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } then {
+    verbose "Skipping i386 unwinder tests."
+    return
+}
+
+set testfile "i386-signal"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
+	  executable { debug }] != "" } {
+    untested i386-sigframe.exp
+    return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+runto func
+gdb_test "backtrace 10" \
+    "#0  ($hex in )?func.*\r\n#1  <signal handler called>\r\n#2  ($hex in)?main.*"
+
+gdb_test "finish" "Run till exit from \#0  func.*<signal handler called>"
diff --git a/gdb/v850-tdep.c b/gdb/v850-tdep.c
index 6cfa84edb3..752223c859 100644
--- a/gdb/v850-tdep.c
+++ b/gdb/v850-tdep.c
@@ -856,7 +856,7 @@ v850_frame_cache (struct frame_info *next_frame, void **this_cache)
   if (cache->base == 0)
     return cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   current_pc = frame_pc_unwind (next_frame);
   if (cache->pc != 0)
     v850_analyze_prologue (cache->pc, current_pc, cache);
diff --git a/gdb/vax-tdep.c b/gdb/vax-tdep.c
index 877e02dd3b..ad53725df1 100644
--- a/gdb/vax-tdep.c
+++ b/gdb/vax-tdep.c
@@ -384,7 +384,8 @@ vax_frame_this_id (struct frame_info *next_frame, void **this_cache,
   if (cache->base == 0)
     return;
 
-  (*this_id) = frame_id_build (cache->base, frame_func_unwind (next_frame));
+  (*this_id) = frame_id_build (cache->base,
+			       frame_func_unwind (next_frame, NORMAL_FRAME));
 }
 
 static void
diff --git a/gdb/xstormy16-tdep.c b/gdb/xstormy16-tdep.c
index 0c48413637..e03498fc6c 100644
--- a/gdb/xstormy16-tdep.c
+++ b/gdb/xstormy16-tdep.c
@@ -655,7 +655,7 @@ xstormy16_frame_cache (struct frame_info *next_frame, void **this_cache)
   if (cache->base == 0)
     return cache;
 
-  cache->pc = frame_func_unwind (next_frame);
+  cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
   current_pc = frame_pc_unwind (next_frame);
   if (cache->pc)
     xstormy16_analyze_prologue (cache->pc, current_pc, cache, next_frame);
diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index 45ae09b785..eb06b06cfe 100644
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -924,7 +924,7 @@ xtensa_frame_cache (struct frame_info *next_frame, void **this_cache)
       cache->ws = ws & ~(1 << wb);
     }
 
-  cache->pc = ((frame_func_unwind (next_frame) & 0xc0000000)
+  cache->pc = ((frame_func_unwind (next_frame, NORMAL_FRAME) & 0xc0000000)
 	       | (ra & 0x3fffffff));
   cache->ps = (ps & ~PS_CALLINC_MASK) | ((WINSIZE(ra)/4) << PS_CALLINC_SHIFT);
 
-- 
2.34.1