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/* Traditional frame unwind support, for GDB the GNU Debugger.
Copyright (C) 2003-2022 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"
#include "frame-unwind.h"
#include "target.h"
#include "value.h"
#include "gdbarch.h"
#include "gdbsupport/traits.h"
struct trad_frame_cache
{
struct frame_info *this_frame;
CORE_ADDR this_base;
trad_frame_saved_reg *prev_regs;
struct frame_id this_id;
};
struct trad_frame_cache *
trad_frame_cache_zalloc (struct frame_info *this_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 (this_frame);
this_trad_cache->this_frame = this_frame;
return this_trad_cache;
}
/* See trad-frame.h. */
void
trad_frame_reset_saved_regs (struct gdbarch *gdbarch,
trad_frame_saved_reg *regs)
{
int numregs = gdbarch_num_cooked_regs (gdbarch);
for (int regnum = 0; regnum < numregs; regnum++)
regs[regnum].set_realreg (regnum);
}
trad_frame_saved_reg *
trad_frame_alloc_saved_regs (struct gdbarch *gdbarch)
{
#ifdef HAVE_IS_TRIVIALLY_CONSTRUCTIBLE
gdb_static_assert (std::is_trivially_constructible<trad_frame_saved_reg>::value);
#endif
int numregs = gdbarch_num_cooked_regs (gdbarch);
trad_frame_saved_reg *this_saved_regs
= FRAME_OBSTACK_CALLOC (numregs, trad_frame_saved_reg);
/* For backwards compatibility, initialize all the register values to
REALREG, with register 0 stored in 0, register 1 stored in 1 and so
on. */
trad_frame_reset_saved_regs (gdbarch, this_saved_regs);
return this_saved_regs;
}
/* 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). */
trad_frame_saved_reg *
trad_frame_alloc_saved_regs (struct frame_info *this_frame)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
return trad_frame_alloc_saved_regs (gdbarch);
}
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). */
this_trad_cache->prev_regs[regnum].set_value (val);
}
void
trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
int regnum, int realreg)
{
this_trad_cache->prev_regs[regnum].set_realreg (realreg);
}
void
trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
int regnum, CORE_ADDR addr)
{
this_trad_cache->prev_regs[regnum].set_addr (addr);
}
void
trad_frame_set_reg_regmap (struct trad_frame_cache *this_trad_cache,
const struct regcache_map_entry *regmap,
CORE_ADDR addr, size_t size)
{
struct gdbarch *gdbarch = get_frame_arch (this_trad_cache->this_frame);
int offs = 0, count;
for (; (count = regmap->count) != 0; regmap++)
{
int regno = regmap->regno;
int slot_size = regmap->size;
if (slot_size == 0 && regno != REGCACHE_MAP_SKIP)
slot_size = register_size (gdbarch, regno);
if (offs + slot_size > size)
break;
if (regno == REGCACHE_MAP_SKIP)
offs += count * slot_size;
else
for (; count--; regno++, offs += slot_size)
{
/* Mimic the semantics of regcache::transfer_regset if a
register slot's size does not match the size of a
register.
If a register slot is larger than a register, assume
the register's value is stored in the first N bytes of
the slot and ignore the remaining bytes.
If the register slot is smaller than the register,
assume that the slot contains the low N bytes of the
register's value. Since trad_frame assumes that
registers stored by address are sized according to the
register, read the low N bytes and zero-extend them to
generate a register value. */
if (slot_size >= register_size (gdbarch, regno))
trad_frame_set_reg_addr (this_trad_cache, regno, addr + offs);
else
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[slot_size];
if (target_read_memory (addr + offs, buf, sizeof buf) == 0)
{
LONGEST val
= extract_unsigned_integer (buf, sizeof buf, byte_order);
trad_frame_set_reg_value (this_trad_cache, regno, val);
}
}
}
}
}
/* See trad-frame.h. */
void
trad_frame_set_reg_value_bytes (struct trad_frame_cache *this_trad_cache,
int regnum,
gdb::array_view<const gdb_byte> bytes)
{
/* External interface for users of trad_frame_cache
(who cannot access the prev_regs object directly). */
this_trad_cache->prev_regs[regnum].set_value_bytes (bytes);
}
struct value *
trad_frame_get_prev_register (struct frame_info *this_frame,
trad_frame_saved_reg this_saved_regs[],
int regnum)
{
if (this_saved_regs[regnum].is_addr ())
/* The register was saved in memory. */
return frame_unwind_got_memory (this_frame, regnum,
this_saved_regs[regnum].addr ());
else if (this_saved_regs[regnum].is_realreg ())
return frame_unwind_got_register (this_frame, regnum,
this_saved_regs[regnum].realreg ());
else if (this_saved_regs[regnum].is_value ())
/* The register's value is available. */
return frame_unwind_got_constant (this_frame, regnum,
this_saved_regs[regnum].value ());
else if (this_saved_regs[regnum].is_value_bytes ())
/* The register's value is available as a sequence of bytes. */
return frame_unwind_got_bytes (this_frame, regnum,
this_saved_regs[regnum].value_bytes ());
else
return frame_unwind_got_optimized (this_frame, regnum);
}
struct value *
trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
struct frame_info *this_frame,
int regnum)
{
return trad_frame_get_prev_register (this_frame, this_trad_cache->prev_regs,
regnum);
}
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;
}
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