gdb: add target_ops::supports_displaced_step

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

diff --git a/gdb/sentinel-frame.c b/gdb/sentinel-frame.c
index bf199f514bc85af4b8df830f62a6b8ee50623403..1d601ca27b2116edadcc0103adc1411ef502d339 100644 (file)
--- a/gdb/sentinel-frame.c
+++ b/gdb/sentinel-frame.c
@@ -1,8 +1,6 @@
 /* Code dealing with register stack frames, for GDB, the GNU debugger.
 
-   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
-   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2008
-   Free Software Foundation, Inc.
+   Copyright (C) 1986-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -36,40 +34,30 @@ sentinel_frame_cache (struct regcache *regcache)
 {
   struct frame_unwind_cache *cache = 
     FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
+
   cache->regcache = regcache;
   return cache;
 }
 
 /* Here the register value is taken direct from the register cache.  */
 
-static void
-sentinel_frame_prev_register (struct frame_info *next_frame,
+static struct value *
+sentinel_frame_prev_register (struct frame_info *this_frame,
                              void **this_prologue_cache,
-                             int regnum, int *optimized,
-                             enum lval_type *lvalp, CORE_ADDR *addrp,
-                             int *realnum, gdb_byte *bufferp)
+                             int regnum)
 {
-  struct frame_unwind_cache *cache = *this_prologue_cache;
-  /* Describe the register's location.  A reg-frame maps all registers
-     onto the corresponding hardware register.  */
-  *optimized = 0;
-  *lvalp = lval_register;
-  *addrp = register_offset_hack (current_gdbarch, regnum);
-  *realnum = regnum;
-
-  /* If needed, find and return the value of the register.  */
-  if (bufferp != NULL)
-    {
-      /* Return the actual value.  */
-      /* Use the regcache_cooked_read() method so that it, on the fly,
-         constructs either a raw or pseudo register from the raw
-         register cache.  */
-      regcache_cooked_read (cache->regcache, regnum, bufferp);
-    }
+  struct frame_unwind_cache *cache
+    = (struct frame_unwind_cache *) *this_prologue_cache;
+  struct value *value;
+
+  value = cache->regcache->cooked_read_value (regnum);
+  VALUE_NEXT_FRAME_ID (value) = sentinel_frame_id;
+
+  return value;
 }
 
 static void
-sentinel_frame_this_id (struct frame_info *next_frame,
+sentinel_frame_this_id (struct frame_info *this_frame,
                        void **this_prologue_cache,
                        struct frame_id *this_id)
 {
@@ -79,22 +67,24 @@ sentinel_frame_this_id (struct frame_info *next_frame,
   internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
 }
 
-static CORE_ADDR
-sentinel_frame_prev_pc (struct frame_info *next_frame,
-                       void **this_prologue_cache)
+static struct gdbarch *
+sentinel_frame_prev_arch (struct frame_info *this_frame,
+                         void **this_prologue_cache)
 {
-  struct gdbarch *gdbarch = get_frame_arch (next_frame);
-  return gdbarch_unwind_pc (gdbarch, next_frame);
+  struct frame_unwind_cache *cache
+    = (struct frame_unwind_cache *) *this_prologue_cache;
+
+  return cache->regcache->arch ();
 }
 
-const struct frame_unwind sentinel_frame_unwinder =
+const struct frame_unwind sentinel_frame_unwind =
 {
   SENTINEL_FRAME,
+  default_frame_unwind_stop_reason,
   sentinel_frame_this_id,
   sentinel_frame_prev_register,
-  NULL, /* unwind_data */
-  NULL, /* sniffer */
-  sentinel_frame_prev_pc,
+  NULL,
+  NULL,
+  NULL,
+  sentinel_frame_prev_arch,
 };
-
-const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder;