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/* Traditional frame unwind support, for GDB the GNU Debugger.
Copyright 2003 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "trad-frame.h"
#include "regcache.h"
/* A traditional frame is unwound by analysing the function prologue
and using the information gathered to track registers. For
non-optimized frames, the technique is reliable (just need to check
for all potential instruction sequences). */
struct trad_frame_saved_reg *
trad_frame_alloc_saved_regs (struct frame_info *next_frame)
{
int regnum;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
int numregs = NUM_REGS + NUM_PSEUDO_REGS;
struct trad_frame_saved_reg *this_saved_regs
= FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
for (regnum = 0; regnum < numregs; regnum++)
{
this_saved_regs[regnum].realreg = regnum;
this_saved_regs[regnum].addr = -1;
}
return this_saved_regs;
}
enum { REG_VALUE = -1, REG_UNKNOWN = -2 };
int
trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
{
return (this_saved_regs[regnum].realreg == REG_VALUE);
}
int
trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
{
return (this_saved_regs[regnum].realreg >= 0
&& this_saved_regs[regnum].addr != -1);
}
int
trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
int regnum)
{
return (this_saved_regs[regnum].realreg >= 0
&& this_saved_regs[regnum].addr == -1);
}
void
trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
int regnum, LONGEST val)
{
/* Make the REALREG invalid, indicating that the ADDR contains the
register's value. */
this_saved_regs[regnum].realreg = REG_VALUE;
this_saved_regs[regnum].addr = val;
}
void
trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
int regnum)
{
/* Make the REALREG invalid, indicating that the value is not known. */
this_saved_regs[regnum].realreg = REG_UNKNOWN;
this_saved_regs[regnum].addr = -1;
}
void
trad_frame_prev_register (struct frame_info *next_frame,
struct trad_frame_saved_reg this_saved_regs[],
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realregp, void *bufferp)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
if (trad_frame_addr_p (this_saved_regs, regnum))
{
/* The register was saved in memory. */
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = this_saved_regs[regnum].addr;
*realregp = -1;
if (bufferp != NULL)
{
/* Read the value in from memory. */
get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp,
register_size (gdbarch, regnum));
}
}
else if (trad_frame_realreg_p (this_saved_regs, regnum))
{
/* Ask the next frame to return the value of the register. */
frame_register_unwind (next_frame, this_saved_regs[regnum].realreg,
optimizedp, lvalp, addrp, realregp, bufferp);
}
else if (trad_frame_value_p (this_saved_regs, regnum))
{
/* The register's value is available. */
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realregp = -1;
if (bufferp != NULL)
store_unsigned_integer (bufferp, register_size (gdbarch, regnum),
this_saved_regs[regnum].addr);
}
else
{
error ("Register %s not available",
gdbarch_register_name (gdbarch, regnum));
}
}
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