gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gdb / tramp-frame.c

diff --git a/gdb/tramp-frame.c b/gdb/tramp-frame.c
index d4d3a4519ab6d68294becdd2598ae578211fdcc6..97b985dab44a06df1f72a4872aeb7933c42ebf08 100644 (file)
--- a/gdb/tramp-frame.c
+++ b/gdb/tramp-frame.c
@@ -1,7 +1,6 @@
 /* Signal trampoline unwinder, for GDB the GNU Debugger.
 
-   Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 2004-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -27,7 +26,6 @@
 #include "target.h"
 #include "trad-frame.h"
 #include "frame-base.h"
-#include "gdb_assert.h"
 
 struct frame_data
 {
@@ -45,7 +43,8 @@ static struct trad_frame_cache *
 tramp_frame_cache (struct frame_info *this_frame,
                   void **this_cache)
 {
-  struct tramp_frame_cache *tramp_cache = (*this_cache);
+  struct tramp_frame_cache *tramp_cache
+    = (struct tramp_frame_cache *) *this_cache;
 
   if (tramp_cache->trad_cache == NULL)
     {
@@ -88,6 +87,10 @@ tramp_frame_start (const struct tramp_frame *tramp,
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   int ti;
 
+  /* Check if we can use this trampoline.  */
+  if (tramp->validate && !tramp->validate (tramp, this_frame, &pc))
+    return 0;
+
   /* Search through the trampoline for one that matches the
      instruction sequence around PC.  */
   for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
@@ -163,6 +166,7 @@ tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
   unwinder->type = tramp_frame->frame_type;
   unwinder->unwind_data = data;
   unwinder->sniffer = tramp_frame_sniffer;
+  unwinder->stop_reason = default_frame_unwind_stop_reason;
   unwinder->this_id = tramp_frame_this_id;
   unwinder->prev_register = tramp_frame_prev_register;
   frame_unwind_prepend_unwinder (gdbarch, unwinder);