218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/* Traditional frame unwind support, for GDB the GNU Debugger.
|
|
|
|
Copyright (C) 2003, 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "frame.h"
|
|
#include "trad-frame.h"
|
|
#include "regcache.h"
|
|
|
|
struct trad_frame_cache
|
|
{
|
|
struct frame_info *next_frame;
|
|
CORE_ADDR this_base;
|
|
struct trad_frame_saved_reg *prev_regs;
|
|
struct frame_id this_id;
|
|
};
|
|
|
|
struct trad_frame_cache *
|
|
trad_frame_cache_zalloc (struct frame_info *next_frame)
|
|
{
|
|
struct trad_frame_cache *this_trad_cache;
|
|
|
|
this_trad_cache = FRAME_OBSTACK_ZALLOC (struct trad_frame_cache);
|
|
this_trad_cache->prev_regs = trad_frame_alloc_saved_regs (next_frame);
|
|
this_trad_cache->next_frame = next_frame;
|
|
return this_trad_cache;
|
|
}
|
|
|
|
/* 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 = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
|
|
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_reg_value (struct trad_frame_cache *this_trad_cache,
|
|
int regnum, LONGEST val)
|
|
{
|
|
/* External interface for users of trad_frame_cache
|
|
(who cannot access the prev_regs object directly). */
|
|
trad_frame_set_value (this_trad_cache->prev_regs, regnum, val);
|
|
}
|
|
|
|
void
|
|
trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
|
|
int regnum, int realreg)
|
|
{
|
|
this_trad_cache->prev_regs[regnum].realreg = realreg;
|
|
this_trad_cache->prev_regs[regnum].addr = -1;
|
|
}
|
|
|
|
void
|
|
trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
|
|
int regnum, CORE_ADDR addr)
|
|
{
|
|
this_trad_cache->prev_regs[regnum].addr = addr;
|
|
}
|
|
|
|
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_get_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, gdb_byte *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))
|
|
{
|
|
*optimizedp = 0;
|
|
*lvalp = lval_register;
|
|
*addrp = 0;
|
|
*realregp = this_saved_regs[regnum].realreg;
|
|
/* Ask the next frame to return the value of the register. */
|
|
if (bufferp)
|
|
frame_unwind_register (next_frame, (*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));
|
|
}
|
|
}
|
|
|
|
void
|
|
trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
|
|
struct frame_info *next_frame,
|
|
int regnum, int *optimizedp,
|
|
enum lval_type *lvalp, CORE_ADDR *addrp,
|
|
int *realregp, gdb_byte *bufferp)
|
|
{
|
|
trad_frame_get_prev_register (next_frame, this_trad_cache->prev_regs,
|
|
regnum, optimizedp, lvalp, addrp, realregp,
|
|
bufferp);
|
|
}
|
|
|
|
void
|
|
trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
|
|
struct frame_id this_id)
|
|
{
|
|
this_trad_cache->this_id = this_id;
|
|
}
|
|
|
|
void
|
|
trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
(*this_id) = this_trad_cache->this_id;
|
|
}
|
|
|
|
void
|
|
trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
|
|
CORE_ADDR this_base)
|
|
{
|
|
this_trad_cache->this_base = this_base;
|
|
}
|
|
|
|
CORE_ADDR
|
|
trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache)
|
|
{
|
|
return this_trad_cache->this_base;
|
|
}
|