+ frame_register_unwind (next_frame, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m68k_frame_unwind =
+{
+ NORMAL_FRAME,
+ m68k_frame_this_id,
+ m68k_frame_prev_register
+};
+
+static const struct frame_unwind *
+m68k_frame_sniffer (struct frame_info *next_frame)
+{
+ return &m68k_frame_unwind;
+}
+\f
+/* Signal trampolines. */
+
+static struct m68k_frame_cache *
+m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct m68k_frame_cache *cache;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ struct m68k_sigtramp_info info;
+ char buf[4];
+ int i;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = m68k_alloc_frame_cache ();
+
+ frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4) - 4;
+
+ info = tdep->get_sigtramp_info (next_frame);
+
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ if (info.sc_reg_offset[i] != -1)
+ cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i];
+
+ *this_cache = cache;
+ return cache;
+}
+
+static void
+m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m68k_frame_cache *cache =
+ m68k_sigtramp_frame_cache (next_frame, this_cache);
+
+ /* See the end of m68k_push_dummy_call. */
+ *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame));
+}
+
+static void
+m68k_sigtramp_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ /* Make sure we've initialized the cache. */
+ m68k_sigtramp_frame_cache (next_frame, this_cache);
+
+ m68k_frame_prev_register (next_frame, this_cache, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m68k_sigtramp_frame_unwind =
+{
+ SIGTRAMP_FRAME,
+ m68k_sigtramp_frame_this_id,
+ m68k_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+m68k_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ char *name;
+
+ /* We shouldn't even bother to try if the OSABI didn't register
+ a get_sigtramp_info handler. */
+ if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info)
+ return NULL;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (PC_IN_SIGTRAMP (pc, name))
+ return &m68k_sigtramp_frame_unwind;
+
+ return NULL;