gdb/

	* frame.c (frame_unwind_register): Throw an error if unwinding the
	register failed.
	* get_prev_frame_1 (get_prev_frame_1): Ask the unwinder if there's
	an unwind stop reason.
	(frame_stop_reason_string): Handle UNWIND_UNAVAILABLE.
	* frame.h (enum unwind_stop_reason) <UNWIND_OUTERMOST,
	UNWIND_UNAVAILABLE>: New.
	* inline-frame.c (inline_frame_unwind): Install
	default_frame_unwind_stop_reason.
	* frame-unwind.c: Include "exceptions.h".
	(frame_unwind_find_by_frame): Swallow NOT_AVAILABLE_ERROR errors.
	(default_frame_unwind_stop_reason): New.
	* frame-unwind.h (frame_unwind_stop_reason_ftype): New typedef.
	(default_frame_unwind_stop_reason): Declare.
	(struct frame_unwind) <stop_reason>: New function pointer.

	* dummy-frame.c: Install default_frame_unwind_stop_reason.
	* dwarf2-frame.c: Include exceptions.h.
	(struct dwarf2_frame_cache) <unavailable_retaddr>: New field.
	(dwarf2_frame_cache): Swallow NOT_AVAILABLE_ERROR errors when
	computing the CFA.  If such an error was thrown, set
	unavailable_retaddr.
	(dwarf2_frame_unwind_stop_reason): New.
	(dwarf2_frame_this_id): Don't build a frame id if the CFA was
	unavailable.
	(dwarf2_frame_unwind): Install dwarf2_frame_unwind_stop_reason.
	(dwarf2_signal_frame_unwind): Ditto.

	* amd64-tdep.c: Include "exceptions.h".
	(struct amd64_frame_cache): New field "base_p".
	(amd64_init_frame_cache): Clear it.
	(amd64_frame_cache_1): New, factored out from amd64_frame_cache.
	Avoid reading registers with functions that throw if the register
	is not necessary to compute the frame base.
	(amd64_frame_cache): Reimplement wrapping amd64_frame_cache_1, and
	swallowing NOT_AVAILABLE_ERROR.
	(amd64_frame_unwind_stop_reason): New.
	(amd64_frame_this_id): Don't build a frame id if the frame base
	was unavailable.
	(amd64_frame_unwind): Install amd64_frame_unwind_stop_reason.
	(amd64_sigtramp_frame_cache): Swallow NOT_AVAILABLE_ERROR, and set
	base_p if the frame base was computable.
	(amd64_sigtramp_frame_unwind_stop_reason): New.
	(amd64_sigtramp_frame_this_id): Don't build a frame id if the
	frame base was unavailable.
	(amd64_sigtramp_frame_unwind): Install
	amd64_sigtramp_frame_unwind_stop_reason.
	(amd64_epilogue_frame_cache): Swallow NOT_AVAILABLE_ERROR, and set
	base_p if the frame base was computable.
	(amd64_epilogue_frame_unwind_stop_reason): New.
	(amd64_epilogue_frame_this_id): Don't build a frame id if the
	frame base was unavailable.
	(amd64_epilogue_frame_unwind): Install
	amd64_epilogue_frame_unwind_stop_reason.
	* i386-tdep.c: Include "exceptions.h".
	(struct i386_frame_cache): New field "base_p".
	(i386_init_frame_cache): Clear it.
	(i386_frame_cache_1): New, factored out from amd64_frame_cache.
	Avoid reading registers with functions that throw if the register
	is not necessary to compute the frame base.
	(i386_frame_cache): Reimplement wrapping amd64_frame_cache_1, and
	swallowing NOT_AVAILABLE_ERROR.
	(i386_frame_unwind_stop_reason): New.
	(i386_frame_this_id): Don't build a frame id if the frame base was
	unavailable.
	(i386_frame_prev_register): Handle unavailable SP.
	(i386_frame_unwind): Install i386_frame_unwind_stop_reason.
	(i386_epilogue_frame_cache): Swallow NOT_AVAILABLE_ERROR, and set
	base_p if the frame base was computable.
	(i386_epilogue_frame_unwind_stop_reason): New.
	(i386_epilogue_frame_this_id): Don't build a frame id if the frame
	base was unavailable.
	(i386_epilogue_frame_unwind): Install
	i386_epilogue_frame_unwind_stop_reason.
	(i386_sigtramp_frame_cache): Swallow NOT_AVAILABLE_ERROR, and set
	base_p if the frame base was computable.
	(i386_sigtramp_frame_unwind_stop_reason): New.
	(i386_sigtramp_frame_this_id): Don't build a frame id if the frame
	base was unavailable.
	(i386_sigtramp_frame_unwind): Install
	i386_sigtramp_frame_unwind_stop_reason.
	* sentinel-frame.c (sentinel_frame_prev_register): Use the value
	type's size, not the register's.
	(sentinel_frame_unwind): Install default_frame_unwind_stop_reason.

	* alpha-mdebug-tdep.c (alpha_mdebug_frame_unwind): Install
	default_frame_unwind_stop_reason.
	* alpha-tdep.c (alpha_sigtramp_frame_unwind)
	(alpha_heuristic_frame_unwind): Ditto.
	* amd64obsd-tdep.c (amd64obsd_trapframe_unwind): Ditto.
	* arm-tdep.c (arm_prologue_unwind, arm_stub_unwind): Ditto.
	* avr-tdep.c (avr_frame_unwind): Ditto.
	* cris-tdep.c (cris_sigtramp_frame_unwind, cris_frame_unwind):
	Ditto.
	* frv-linux-tdep.c (frv_linux_sigtramp_frame_unwind): Ditto.
	* frv-tdep.c (frv_frame_unwind): Ditto.
	* h8300-tdep.c (h8300_frame_unwind): Ditto.
	* hppa-hpux-tdep.c (hppa_hpux_sigtramp_frame_unwind): Ditto.
	* hppa-linux-tdep.c (hppa_linux_sigtramp_frame_unwind): Ditto.
	* hppa-tdep.c (hppa_frame_unwind, hppa_fallback_frame_unwind)
	(hppa_stub_frame_unwind): Ditto.
	* i386obsd-tdep.c (i386obsd_trapframe_unwind): Ditto.
	* ia64-tdep.c (ia64_frame_unwind, ia64_sigtramp_frame_unwind)
	(ia64_libunwind_frame_unwind)
	(ia64_libunwind_sigtramp_frame_unwind): Ditto.
	* iq2000-tdep.c (iq2000_frame_unwind): Ditto.
	* lm32-tdep.c (lm32_frame_unwind): Ditto.
	* m32c-tdep.c (m32c_unwind): Ditto.
	* m32r-linux-tdep.c (m32r_linux_sigtramp_frame_unwind): Ditto.
	* m32r-tdep.c (m32r_frame_unwind): Ditto.
	* m68hc11-tdep.c (m68hc11_frame_unwind): Ditto.
	* m68k-tdep.c (m68k_frame_unwind): Ditto.
	* m68klinux-tdep.c (m68k_linux_sigtramp_frame_unwind): Ditto.
	* m88k-tdep.c (m88k_frame_unwind): Ditto.
	* mep-tdep.c (mep_frame_unwind): Ditto.
	* microblaze-tdep.c (microblaze_frame_unwind): Ditto.
	* mips-tdep.c (mips_insn16_frame_unwind, mips_insn32_frame_unwind)
	(mips_stub_frame_unwind): Ditto.
	* mn10300-tdep.c (mn10300_frame_unwind): Ditto.
	* moxie-tdep.c (moxie_frame_unwind): Ditto.
	* mt-tdep.c (mt_frame_unwind): Ditto.
	* ppc-linux-tdep.c (ppu2spu_unwind): Ditto.
	* ppcobsd-tdep.c (ppcobsd_sigtramp_frame_unwind): Ditto.
	* rs6000-tdep.c (rs6000_frame_unwind): Ditto.
	* s390-tdep.c (s390_frame_unwind, s390_stub_frame_unwind)
	(s390_sigtramp_frame_unwind): Ditto.
	* score-tdep.c (score_prologue_unwind): Ditto.
	* sh-tdep.c (sh_frame_unwind): Ditto.
	* sh64-tdep.c (sh64_frame_unwind): Ditto.
	* sparc-sol2-tdep.c (sparc32_sol2_sigtramp_frame_unwind): Ditto.
	* sparc-tdep.c (sparc32_frame_unwind): Ditto.
	* sparc64-sol2-tdep.c (sparc64_sol2_sigtramp_frame_unwind): Ditto.
	* sparc64-tdep.c (sparc64_frame_unwind): Ditto.
	* sparc64fbsd-tdep.c (sparc64fbsd_sigtramp_frame_unwind): Ditto.
	* sparc64nbsd-tdep.c (sparc64nbsd_sigcontext_frame_unwind): Ditto.
	* sparc64obsd-tdep.c (sparc64obsd_frame_unwind)
	(sparc64obsd_trapframe_unwind): Ditto.
	* sparcnbsd-tdep.c (sparc32nbsd_sigcontext_frame_unwind): Ditto.
	* sparcobsd-tdep.c (sparc32obsd_sigtramp_frame_unwind): Ditto.
	* spu-tdep.c (spu_frame_unwind, spu2ppu_unwind): Ditto.
	* v850-tdep.c (v850_frame_unwind): Ditto.
	* vax-tdep.c (vax_frame_unwind): Ditto.
	* vaxobsd-tdep.c (vaxobsd_sigtramp_frame_unwind): Ditto.
	* xstormy16-tdep.c (frame_unwind xstormy16_frame_unwind): Ditto.
	* xtensa-tdep.c (xtensa_unwind): Ditto.

1 files changed, 60 insertions, 21 deletions

diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index edd6a9c5267..e78c3284ade 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -40,6 +40,7 @@
 #include "dwarf2-frame.h"
 #include "ax.h"
 #include "dwarf2loc.h"
+#include "exceptions.h"
 
 struct comp_unit;
 
@@ -986,6 +987,10 @@ struct dwarf2_frame_cache
   /* DWARF Call Frame Address.  */
   CORE_ADDR cfa;
 
+  /* Set if the return address column was marked as unavailable
+     (required non-collected memory or registers to compute).  */
+  int unavailable_retaddr;
+
   /* Set if the return address column was marked as undefined.  */
   int undefined_retaddr;
 
@@ -1013,6 +1018,7 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
   struct dwarf2_frame_cache *cache;
   struct dwarf2_frame_state *fs;
   struct dwarf2_fde *fde;
+  volatile struct gdb_exception ex;
 
   if (*this_cache)
     return *this_cache;
@@ -1020,10 +1026,10 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
   /* Allocate a new cache.  */
   cache = FRAME_OBSTACK_ZALLOC (struct dwarf2_frame_cache);
   cache->reg = FRAME_OBSTACK_CALLOC (num_regs, struct dwarf2_frame_state_reg);
+  *this_cache = cache;
 
   /* Allocate and initialize the frame state.  */
-  fs = XMALLOC (struct dwarf2_frame_state);
-  memset (fs, 0, sizeof (struct dwarf2_frame_state));
+  fs = XZALLOC (struct dwarf2_frame_state);
   old_chain = make_cleanup (dwarf2_frame_state_free, fs);
 
   /* Unwind the PC.
@@ -1068,26 +1074,39 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
   execute_cfa_program (fde, fde->instructions, fde->end, gdbarch,
 		       get_frame_pc (this_frame), fs);
 
-  /* Calculate the CFA.  */
-  switch (fs->regs.cfa_how)
+  TRY_CATCH (ex, RETURN_MASK_ERROR)
     {
-    case CFA_REG_OFFSET:
-      cache->cfa = read_reg (this_frame, fs->regs.cfa_reg);
-      if (fs->armcc_cfa_offsets_reversed)
-	cache->cfa -= fs->regs.cfa_offset;
-      else
-	cache->cfa += fs->regs.cfa_offset;
-      break;
-
-    case CFA_EXP:
-      cache->cfa =
-	execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len,
-			  cache->addr_size, cache->text_offset,
-			  this_frame, 0, 0);
-      break;
+      /* Calculate the CFA.  */
+      switch (fs->regs.cfa_how)
+	{
+	case CFA_REG_OFFSET:
+	  cache->cfa = read_reg (this_frame, fs->regs.cfa_reg);
+	  if (fs->armcc_cfa_offsets_reversed)
+	    cache->cfa -= fs->regs.cfa_offset;
+	  else
+	    cache->cfa += fs->regs.cfa_offset;
+	  break;
+
+	case CFA_EXP:
+	  cache->cfa =
+	    execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len,
+			      cache->addr_size, cache->text_offset,
+			      this_frame, 0, 0);
+	  break;
+
+	default:
+	  internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
+	}
+    }
+  if (ex.reason < 0)
+    {
+      if (ex.error == NOT_AVAILABLE_ERROR)
+	{
+	  cache->unavailable_retaddr = 1;
+	  return cache;
+	}
 
-    default:
-      internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
+      throw_exception (ex);
     }
 
   /* Initialize the register state.  */
@@ -1193,10 +1212,25 @@ incomplete CFI data; unspecified registers (e.g., %s) at %s"),
 
   do_cleanups (old_chain);
 
-  *this_cache = cache;
   return cache;
 }
 
+static enum unwind_stop_reason
+dwarf2_frame_unwind_stop_reason (struct frame_info *this_frame,
+				 void **this_cache)
+{
+  struct dwarf2_frame_cache *cache
+    = dwarf2_frame_cache (this_frame, this_cache);
+
+  if (cache->unavailable_retaddr)
+    return UNWIND_UNAVAILABLE;
+
+  if (cache->undefined_retaddr)
+    return UNWIND_OUTERMOST;
+
+  return UNWIND_NO_REASON;
+}
+
 static void
 dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache,
 		      struct frame_id *this_id)
@@ -1204,6 +1238,9 @@ dwarf2_frame_this_id (struct frame_info *this_frame, void **this_cache,
   struct dwarf2_frame_cache *cache =
     dwarf2_frame_cache (this_frame, this_cache);
 
+  if (cache->unavailable_retaddr)
+    return;
+
   if (cache->undefined_retaddr)
     return;
 
@@ -1321,6 +1358,7 @@ dwarf2_frame_sniffer (const struct frame_unwind *self,
 static const struct frame_unwind dwarf2_frame_unwind =
 {
   NORMAL_FRAME,
+  dwarf2_frame_unwind_stop_reason,
   dwarf2_frame_this_id,
   dwarf2_frame_prev_register,
   NULL,
@@ -1330,6 +1368,7 @@ static const struct frame_unwind dwarf2_frame_unwind =
 static const struct frame_unwind dwarf2_signal_frame_unwind =
 {
   SIGTRAMP_FRAME,
+  dwarf2_frame_unwind_stop_reason,
   dwarf2_frame_this_id,
   dwarf2_frame_prev_register,
   NULL,