/* Target-dependent mdebug code for the ALPHA architecture.
Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
- 2003, 2007, 2008, 2009 Free Software Foundation, Inc.
+ 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
This file is part of GDB.
return proc_desc;
}
+/* Return a non-zero result if the function is frameless; zero otherwise. */
+
+static int
+alpha_mdebug_frameless (struct mdebug_extra_func_info *proc_desc)
+{
+ return (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
+ && PROC_FRAME_OFFSET (proc_desc) == 0);
+}
+
/* This returns the PC of the first inst after the prologue. If we can't
find the prologue, then return 0. */
{
/* If function is frameless, then we need to do it the hard way. I
strongly suspect that frameless always means prologueless... */
- if (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0)
+ if (alpha_mdebug_frameless (proc_desc))
return 0;
}
return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
+/* Return a non-zero result if the size of the stack frame exceeds the
+ maximum debuggable frame size (512 Kbytes); zero otherwise. */
+
+static int
+alpha_mdebug_max_frame_size_exceeded (struct mdebug_extra_func_info *proc_desc)
+{
+ /* If frame offset is null, we can be in two cases: either the
+ function is frameless (the stack frame is null) or its
+ frame exceeds the maximum debuggable frame size (512 Kbytes). */
+
+ return (PROC_FRAME_OFFSET (proc_desc) == 0
+ && !alpha_mdebug_frameless (proc_desc));
+}
+
static int
alpha_mdebug_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
if (alpha_mdebug_in_prologue (pc, proc_desc))
return 0;
+ /* If the maximum debuggable frame size has been exceeded, the
+ proc desc is bogus. Fall back on the heuristic unwinder. */
+ if (alpha_mdebug_max_frame_size_exceeded (proc_desc))
+ return 0;
+
return 1;
}
if (proc_desc == NULL)
return NULL;
+ /* If the maximum debuggable frame size has been exceeded, the
+ proc desc is bogus. Fall back on the heuristic unwinder. */
+ if (alpha_mdebug_max_frame_size_exceeded (proc_desc))
+ return 0;
+
return &alpha_mdebug_frame_base;
}