+
+ if (regnum == I386_EIP_REGNUM && cache->pc_in_eax)
+ {
+ frame_register_unwind (next_frame, I386_EAX_REGNUM,
+ optimizedp, lvalp, addrp, realnump, valuep);
+ return;
+ }
+
+ if (regnum == I386_ESP_REGNUM && cache->saved_sp)
+ {
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ {
+ /* Store the value. */
+ store_unsigned_integer (valuep, 4, cache->saved_sp);
+ }
+ return;
+ }
+
+ if (regnum < I386_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1)
+ {
+ *optimizedp = 0;
+ *lvalp = lval_memory;
+ *addrp = cache->saved_regs[regnum];
+ *realnump = -1;
+ if (valuep)
+ {
+ /* Read the value in from memory. */
+ read_memory (*addrp, valuep,
+ register_size (current_gdbarch, regnum));
+ }
+ return;
+ }
+
+ frame_register_unwind (next_frame, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind i386_frame_unwind =
+{
+ NORMAL_FRAME,
+ i386_frame_this_id,
+ i386_frame_prev_register
+};
+
+static const struct frame_unwind *
+i386_frame_sniffer (struct frame_info *next_frame)
+{
+ return &i386_frame_unwind;
+}
+\f
+
+/* Signal trampolines. */
+
+static struct i386_frame_cache *
+i386_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct i386_frame_cache *cache;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ CORE_ADDR addr;
+ char buf[4];
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = i386_alloc_frame_cache ();
+
+ frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4) - 4;
+
+ addr = tdep->sigcontext_addr (next_frame);
+ if (tdep->sc_reg_offset)
+ {
+ int i;
+
+ gdb_assert (tdep->sc_num_regs <= I386_NUM_SAVED_REGS);
+
+ for (i = 0; i < tdep->sc_num_regs; i++)
+ if (tdep->sc_reg_offset[i] != -1)
+ cache->saved_regs[i] = addr + tdep->sc_reg_offset[i];
+ }
+ else
+ {
+ cache->saved_regs[I386_EIP_REGNUM] = addr + tdep->sc_pc_offset;
+ cache->saved_regs[I386_ESP_REGNUM] = addr + tdep->sc_sp_offset;
+ }
+
+ *this_cache = cache;
+ return cache;
+}
+
+static void
+i386_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct i386_frame_cache *cache =
+ i386_sigtramp_frame_cache (next_frame, this_cache);
+
+ /* See the end of i386_push_dummy_call. */
+ (*this_id) = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame));