817 lines
23 KiB
C
817 lines
23 KiB
C
/* Dynamic architecture support for GDB, the GNU debugger.
|
||
|
||
Copyright (C) 1998-2012 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 "arch-utils.h"
|
||
#include "buildsym.h"
|
||
#include "gdbcmd.h"
|
||
#include "inferior.h" /* enum CALL_DUMMY_LOCATION et al. */
|
||
#include "gdb_string.h"
|
||
#include "regcache.h"
|
||
#include "gdb_assert.h"
|
||
#include "sim-regno.h"
|
||
#include "gdbcore.h"
|
||
#include "osabi.h"
|
||
#include "target-descriptions.h"
|
||
#include "objfiles.h"
|
||
|
||
#include "version.h"
|
||
|
||
#include "floatformat.h"
|
||
|
||
|
||
struct displaced_step_closure *
|
||
simple_displaced_step_copy_insn (struct gdbarch *gdbarch,
|
||
CORE_ADDR from, CORE_ADDR to,
|
||
struct regcache *regs)
|
||
{
|
||
size_t len = gdbarch_max_insn_length (gdbarch);
|
||
gdb_byte *buf = xmalloc (len);
|
||
|
||
read_memory (from, buf, len);
|
||
write_memory (to, buf, len);
|
||
|
||
if (debug_displaced)
|
||
{
|
||
fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ",
|
||
paddress (gdbarch, from), paddress (gdbarch, to));
|
||
displaced_step_dump_bytes (gdb_stdlog, buf, len);
|
||
}
|
||
|
||
return (struct displaced_step_closure *) buf;
|
||
}
|
||
|
||
|
||
void
|
||
simple_displaced_step_free_closure (struct gdbarch *gdbarch,
|
||
struct displaced_step_closure *closure)
|
||
{
|
||
xfree (closure);
|
||
}
|
||
|
||
int
|
||
default_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
|
||
struct displaced_step_closure *closure)
|
||
{
|
||
return !gdbarch_software_single_step_p (gdbarch);
|
||
}
|
||
|
||
CORE_ADDR
|
||
displaced_step_at_entry_point (struct gdbarch *gdbarch)
|
||
{
|
||
CORE_ADDR addr;
|
||
int bp_len;
|
||
|
||
addr = entry_point_address ();
|
||
|
||
/* Inferior calls also use the entry point as a breakpoint location.
|
||
We don't want displaced stepping to interfere with those
|
||
breakpoints, so leave space. */
|
||
gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len);
|
||
addr += bp_len * 2;
|
||
|
||
return addr;
|
||
}
|
||
|
||
int
|
||
legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
/* Only makes sense to supply raw registers. */
|
||
gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch));
|
||
/* NOTE: cagney/2002-05-13: The old code did it this way and it is
|
||
suspected that some GDB/SIM combinations may rely on this
|
||
behavour. The default should be one2one_register_sim_regno
|
||
(below). */
|
||
if (gdbarch_register_name (gdbarch, regnum) != NULL
|
||
&& gdbarch_register_name (gdbarch, regnum)[0] != '\0')
|
||
return regnum;
|
||
else
|
||
return LEGACY_SIM_REGNO_IGNORE;
|
||
}
|
||
|
||
CORE_ADDR
|
||
generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
CORE_ADDR
|
||
generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
|
||
CORE_ADDR pc, const char *name)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Helper functions for gdbarch_inner_than */
|
||
|
||
int
|
||
core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
|
||
{
|
||
return (lhs < rhs);
|
||
}
|
||
|
||
int
|
||
core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
|
||
{
|
||
return (lhs > rhs);
|
||
}
|
||
|
||
/* Misc helper functions for targets. */
|
||
|
||
CORE_ADDR
|
||
core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr)
|
||
{
|
||
return addr;
|
||
}
|
||
|
||
CORE_ADDR
|
||
convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
|
||
struct target_ops *targ)
|
||
{
|
||
return addr;
|
||
}
|
||
|
||
int
|
||
no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg)
|
||
{
|
||
return reg;
|
||
}
|
||
|
||
void
|
||
default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
|
||
{
|
||
return;
|
||
}
|
||
|
||
void
|
||
default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
|
||
{
|
||
return;
|
||
}
|
||
|
||
int
|
||
cannot_register_not (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Legacy version of target_virtual_frame_pointer(). Assumes that
|
||
there is an gdbarch_deprecated_fp_regnum and that it is the same,
|
||
cooked or raw. */
|
||
|
||
void
|
||
legacy_virtual_frame_pointer (struct gdbarch *gdbarch,
|
||
CORE_ADDR pc,
|
||
int *frame_regnum,
|
||
LONGEST *frame_offset)
|
||
{
|
||
/* FIXME: cagney/2002-09-13: This code is used when identifying the
|
||
frame pointer of the current PC. It is assuming that a single
|
||
register and an offset can determine this. I think it should
|
||
instead generate a byte code expression as that would work better
|
||
with things like Dwarf2's CFI. */
|
||
if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0
|
||
&& gdbarch_deprecated_fp_regnum (gdbarch)
|
||
< gdbarch_num_regs (gdbarch))
|
||
*frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch);
|
||
else if (gdbarch_sp_regnum (gdbarch) >= 0
|
||
&& gdbarch_sp_regnum (gdbarch)
|
||
< gdbarch_num_regs (gdbarch))
|
||
*frame_regnum = gdbarch_sp_regnum (gdbarch);
|
||
else
|
||
/* Should this be an internal error? I guess so, it is reflecting
|
||
an architectural limitation in the current design. */
|
||
internal_error (__FILE__, __LINE__,
|
||
_("No virtual frame pointer available"));
|
||
*frame_offset = 0;
|
||
}
|
||
|
||
|
||
int
|
||
generic_convert_register_p (struct gdbarch *gdbarch, int regnum,
|
||
struct type *type)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
generic_instruction_nullified (struct gdbarch *gdbarch,
|
||
struct regcache *regcache)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
default_remote_register_number (struct gdbarch *gdbarch,
|
||
int regno)
|
||
{
|
||
return regno;
|
||
}
|
||
|
||
|
||
/* Functions to manipulate the endianness of the target. */
|
||
|
||
static int target_byte_order_user = BFD_ENDIAN_UNKNOWN;
|
||
|
||
static const char endian_big[] = "big";
|
||
static const char endian_little[] = "little";
|
||
static const char endian_auto[] = "auto";
|
||
static const char *const endian_enum[] =
|
||
{
|
||
endian_big,
|
||
endian_little,
|
||
endian_auto,
|
||
NULL,
|
||
};
|
||
static const char *set_endian_string;
|
||
|
||
enum bfd_endian
|
||
selected_byte_order (void)
|
||
{
|
||
return target_byte_order_user;
|
||
}
|
||
|
||
/* Called by ``show endian''. */
|
||
|
||
static void
|
||
show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c,
|
||
const char *value)
|
||
{
|
||
if (target_byte_order_user == BFD_ENDIAN_UNKNOWN)
|
||
if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG)
|
||
fprintf_unfiltered (file, _("The target endianness is set automatically "
|
||
"(currently big endian)\n"));
|
||
else
|
||
fprintf_unfiltered (file, _("The target endianness is set automatically "
|
||
"(currently little endian)\n"));
|
||
else
|
||
if (target_byte_order_user == BFD_ENDIAN_BIG)
|
||
fprintf_unfiltered (file,
|
||
_("The target is assumed to be big endian\n"));
|
||
else
|
||
fprintf_unfiltered (file,
|
||
_("The target is assumed to be little endian\n"));
|
||
}
|
||
|
||
static void
|
||
set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
struct gdbarch_info info;
|
||
|
||
gdbarch_info_init (&info);
|
||
|
||
if (set_endian_string == endian_auto)
|
||
{
|
||
target_byte_order_user = BFD_ENDIAN_UNKNOWN;
|
||
if (! gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("set_endian: architecture update failed"));
|
||
}
|
||
else if (set_endian_string == endian_little)
|
||
{
|
||
info.byte_order = BFD_ENDIAN_LITTLE;
|
||
if (! gdbarch_update_p (info))
|
||
printf_unfiltered (_("Little endian target not supported by GDB\n"));
|
||
else
|
||
target_byte_order_user = BFD_ENDIAN_LITTLE;
|
||
}
|
||
else if (set_endian_string == endian_big)
|
||
{
|
||
info.byte_order = BFD_ENDIAN_BIG;
|
||
if (! gdbarch_update_p (info))
|
||
printf_unfiltered (_("Big endian target not supported by GDB\n"));
|
||
else
|
||
target_byte_order_user = BFD_ENDIAN_BIG;
|
||
}
|
||
else
|
||
internal_error (__FILE__, __LINE__,
|
||
_("set_endian: bad value"));
|
||
|
||
show_endian (gdb_stdout, from_tty, NULL, NULL);
|
||
}
|
||
|
||
/* Given SELECTED, a currently selected BFD architecture, and
|
||
TARGET_DESC, the current target description, return what
|
||
architecture to use.
|
||
|
||
SELECTED may be NULL, in which case we return the architecture
|
||
associated with TARGET_DESC. If SELECTED specifies a variant
|
||
of the architecture associtated with TARGET_DESC, return the
|
||
more specific of the two.
|
||
|
||
If SELECTED is a different architecture, but it is accepted as
|
||
compatible by the target, we can use the target architecture.
|
||
|
||
If SELECTED is obviously incompatible, warn the user. */
|
||
|
||
static const struct bfd_arch_info *
|
||
choose_architecture_for_target (const struct target_desc *target_desc,
|
||
const struct bfd_arch_info *selected)
|
||
{
|
||
const struct bfd_arch_info *from_target = tdesc_architecture (target_desc);
|
||
const struct bfd_arch_info *compat1, *compat2;
|
||
|
||
if (selected == NULL)
|
||
return from_target;
|
||
|
||
if (from_target == NULL)
|
||
return selected;
|
||
|
||
/* struct bfd_arch_info objects are singletons: that is, there's
|
||
supposed to be exactly one instance for a given machine. So you
|
||
can tell whether two are equivalent by comparing pointers. */
|
||
if (from_target == selected)
|
||
return selected;
|
||
|
||
/* BFD's 'A->compatible (A, B)' functions return zero if A and B are
|
||
incompatible. But if they are compatible, it returns the 'more
|
||
featureful' of the two arches. That is, if A can run code
|
||
written for B, but B can't run code written for A, then it'll
|
||
return A.
|
||
|
||
Some targets (e.g. MIPS as of 2006-12-04) don't fully
|
||
implement this, instead always returning NULL or the first
|
||
argument. We detect that case by checking both directions. */
|
||
|
||
compat1 = selected->compatible (selected, from_target);
|
||
compat2 = from_target->compatible (from_target, selected);
|
||
|
||
if (compat1 == NULL && compat2 == NULL)
|
||
{
|
||
/* BFD considers the architectures incompatible. Check our
|
||
target description whether it accepts SELECTED as compatible
|
||
anyway. */
|
||
if (tdesc_compatible_p (target_desc, selected))
|
||
return from_target;
|
||
|
||
warning (_("Selected architecture %s is not compatible "
|
||
"with reported target architecture %s"),
|
||
selected->printable_name, from_target->printable_name);
|
||
return selected;
|
||
}
|
||
|
||
if (compat1 == NULL)
|
||
return compat2;
|
||
if (compat2 == NULL)
|
||
return compat1;
|
||
if (compat1 == compat2)
|
||
return compat1;
|
||
|
||
/* If the two didn't match, but one of them was a default
|
||
architecture, assume the more specific one is correct. This
|
||
handles the case where an executable or target description just
|
||
says "mips", but the other knows which MIPS variant. */
|
||
if (compat1->the_default)
|
||
return compat2;
|
||
if (compat2->the_default)
|
||
return compat1;
|
||
|
||
/* We have no idea which one is better. This is a bug, but not
|
||
a critical problem; warn the user. */
|
||
warning (_("Selected architecture %s is ambiguous with "
|
||
"reported target architecture %s"),
|
||
selected->printable_name, from_target->printable_name);
|
||
return selected;
|
||
}
|
||
|
||
/* Functions to manipulate the architecture of the target. */
|
||
|
||
enum set_arch { set_arch_auto, set_arch_manual };
|
||
|
||
static const struct bfd_arch_info *target_architecture_user;
|
||
|
||
static const char *set_architecture_string;
|
||
|
||
const char *
|
||
selected_architecture_name (void)
|
||
{
|
||
if (target_architecture_user == NULL)
|
||
return NULL;
|
||
else
|
||
return set_architecture_string;
|
||
}
|
||
|
||
/* Called if the user enters ``show architecture'' without an
|
||
argument. */
|
||
|
||
static void
|
||
show_architecture (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
if (target_architecture_user == NULL)
|
||
fprintf_filtered (file, _("The target architecture is set "
|
||
"automatically (currently %s)\n"),
|
||
gdbarch_bfd_arch_info (get_current_arch ())->printable_name);
|
||
else
|
||
fprintf_filtered (file, _("The target architecture is assumed to be %s\n"),
|
||
set_architecture_string);
|
||
}
|
||
|
||
|
||
/* Called if the user enters ``set architecture'' with or without an
|
||
argument. */
|
||
|
||
static void
|
||
set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
struct gdbarch_info info;
|
||
|
||
gdbarch_info_init (&info);
|
||
|
||
if (strcmp (set_architecture_string, "auto") == 0)
|
||
{
|
||
target_architecture_user = NULL;
|
||
if (!gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("could not select an architecture automatically"));
|
||
}
|
||
else
|
||
{
|
||
info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
|
||
if (info.bfd_arch_info == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("set_architecture: bfd_scan_arch failed"));
|
||
if (gdbarch_update_p (info))
|
||
target_architecture_user = info.bfd_arch_info;
|
||
else
|
||
printf_unfiltered (_("Architecture `%s' not recognized.\n"),
|
||
set_architecture_string);
|
||
}
|
||
show_architecture (gdb_stdout, from_tty, NULL, NULL);
|
||
}
|
||
|
||
/* Try to select a global architecture that matches "info". Return
|
||
non-zero if the attempt succeds. */
|
||
int
|
||
gdbarch_update_p (struct gdbarch_info info)
|
||
{
|
||
struct gdbarch *new_gdbarch;
|
||
|
||
/* Check for the current file. */
|
||
if (info.abfd == NULL)
|
||
info.abfd = exec_bfd;
|
||
if (info.abfd == NULL)
|
||
info.abfd = core_bfd;
|
||
|
||
/* Check for the current target description. */
|
||
if (info.target_desc == NULL)
|
||
info.target_desc = target_current_description ();
|
||
|
||
new_gdbarch = gdbarch_find_by_info (info);
|
||
|
||
/* If there no architecture by that name, reject the request. */
|
||
if (new_gdbarch == NULL)
|
||
{
|
||
if (gdbarch_debug)
|
||
fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
|
||
"Architecture not found\n");
|
||
return 0;
|
||
}
|
||
|
||
/* If it is the same old architecture, accept the request (but don't
|
||
swap anything). */
|
||
if (new_gdbarch == target_gdbarch)
|
||
{
|
||
if (gdbarch_debug)
|
||
fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
|
||
"Architecture %s (%s) unchanged\n",
|
||
host_address_to_string (new_gdbarch),
|
||
gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
|
||
return 1;
|
||
}
|
||
|
||
/* It's a new architecture, swap it in. */
|
||
if (gdbarch_debug)
|
||
fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
|
||
"New architecture %s (%s) selected\n",
|
||
host_address_to_string (new_gdbarch),
|
||
gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
|
||
deprecated_target_gdbarch_select_hack (new_gdbarch);
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Return the architecture for ABFD. If no suitable architecture
|
||
could be find, return NULL. */
|
||
|
||
struct gdbarch *
|
||
gdbarch_from_bfd (bfd *abfd)
|
||
{
|
||
struct gdbarch_info info;
|
||
gdbarch_info_init (&info);
|
||
|
||
info.abfd = abfd;
|
||
return gdbarch_find_by_info (info);
|
||
}
|
||
|
||
/* Set the dynamic target-system-dependent parameters (architecture,
|
||
byte-order) using information found in the BFD */
|
||
|
||
void
|
||
set_gdbarch_from_file (bfd *abfd)
|
||
{
|
||
struct gdbarch_info info;
|
||
struct gdbarch *gdbarch;
|
||
|
||
gdbarch_info_init (&info);
|
||
info.abfd = abfd;
|
||
info.target_desc = target_current_description ();
|
||
gdbarch = gdbarch_find_by_info (info);
|
||
|
||
if (gdbarch == NULL)
|
||
error (_("Architecture of file not recognized."));
|
||
deprecated_target_gdbarch_select_hack (gdbarch);
|
||
}
|
||
|
||
/* Initialize the current architecture. Update the ``set
|
||
architecture'' command so that it specifies a list of valid
|
||
architectures. */
|
||
|
||
#ifdef DEFAULT_BFD_ARCH
|
||
extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
|
||
static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
|
||
#else
|
||
static const bfd_arch_info_type *default_bfd_arch;
|
||
#endif
|
||
|
||
#ifdef DEFAULT_BFD_VEC
|
||
extern const bfd_target DEFAULT_BFD_VEC;
|
||
static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
|
||
#else
|
||
static const bfd_target *default_bfd_vec;
|
||
#endif
|
||
|
||
static int default_byte_order = BFD_ENDIAN_UNKNOWN;
|
||
|
||
void
|
||
initialize_current_architecture (void)
|
||
{
|
||
const char **arches = gdbarch_printable_names ();
|
||
struct gdbarch_info info;
|
||
|
||
/* determine a default architecture and byte order. */
|
||
gdbarch_info_init (&info);
|
||
|
||
/* Find a default architecture. */
|
||
if (default_bfd_arch == NULL)
|
||
{
|
||
/* Choose the architecture by taking the first one
|
||
alphabetically. */
|
||
const char *chosen = arches[0];
|
||
const char **arch;
|
||
for (arch = arches; *arch != NULL; arch++)
|
||
{
|
||
if (strcmp (*arch, chosen) < 0)
|
||
chosen = *arch;
|
||
}
|
||
if (chosen == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: No arch"));
|
||
default_bfd_arch = bfd_scan_arch (chosen);
|
||
if (default_bfd_arch == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: Arch not found"));
|
||
}
|
||
|
||
info.bfd_arch_info = default_bfd_arch;
|
||
|
||
/* Take several guesses at a byte order. */
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& default_bfd_vec != NULL)
|
||
{
|
||
/* Extract BFD's default vector's byte order. */
|
||
switch (default_bfd_vec->byteorder)
|
||
{
|
||
case BFD_ENDIAN_BIG:
|
||
default_byte_order = BFD_ENDIAN_BIG;
|
||
break;
|
||
case BFD_ENDIAN_LITTLE:
|
||
default_byte_order = BFD_ENDIAN_LITTLE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN)
|
||
{
|
||
/* look for ``*el-*'' in the target name. */
|
||
const char *chp;
|
||
chp = strchr (target_name, '-');
|
||
if (chp != NULL
|
||
&& chp - 2 >= target_name
|
||
&& strncmp (chp - 2, "el", 2) == 0)
|
||
default_byte_order = BFD_ENDIAN_LITTLE;
|
||
}
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN)
|
||
{
|
||
/* Wire it to big-endian!!! */
|
||
default_byte_order = BFD_ENDIAN_BIG;
|
||
}
|
||
|
||
info.byte_order = default_byte_order;
|
||
info.byte_order_for_code = info.byte_order;
|
||
|
||
if (! gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: Selection of "
|
||
"initial architecture failed"));
|
||
|
||
/* Create the ``set architecture'' command appending ``auto'' to the
|
||
list of architectures. */
|
||
{
|
||
/* Append ``auto''. */
|
||
int nr;
|
||
for (nr = 0; arches[nr] != NULL; nr++);
|
||
arches = xrealloc (arches, sizeof (char*) * (nr + 2));
|
||
arches[nr + 0] = "auto";
|
||
arches[nr + 1] = NULL;
|
||
add_setshow_enum_cmd ("architecture", class_support,
|
||
arches, &set_architecture_string,
|
||
_("Set architecture of target."),
|
||
_("Show architecture of target."), NULL,
|
||
set_architecture, show_architecture,
|
||
&setlist, &showlist);
|
||
add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
|
||
}
|
||
}
|
||
|
||
|
||
/* Initialize a gdbarch info to values that will be automatically
|
||
overridden. Note: Originally, this ``struct info'' was initialized
|
||
using memset(0). Unfortunately, that ran into problems, namely
|
||
BFD_ENDIAN_BIG is zero. An explicit initialization function that
|
||
can explicitly set each field to a well defined value is used. */
|
||
|
||
void
|
||
gdbarch_info_init (struct gdbarch_info *info)
|
||
{
|
||
memset (info, 0, sizeof (struct gdbarch_info));
|
||
info->byte_order = BFD_ENDIAN_UNKNOWN;
|
||
info->byte_order_for_code = info->byte_order;
|
||
info->osabi = GDB_OSABI_UNINITIALIZED;
|
||
}
|
||
|
||
/* Similar to init, but this time fill in the blanks. Information is
|
||
obtained from the global "set ..." options and explicitly
|
||
initialized INFO fields. */
|
||
|
||
void
|
||
gdbarch_info_fill (struct gdbarch_info *info)
|
||
{
|
||
/* "(gdb) set architecture ...". */
|
||
if (info->bfd_arch_info == NULL
|
||
&& target_architecture_user)
|
||
info->bfd_arch_info = target_architecture_user;
|
||
/* From the file. */
|
||
if (info->bfd_arch_info == NULL
|
||
&& info->abfd != NULL
|
||
&& bfd_get_arch (info->abfd) != bfd_arch_unknown
|
||
&& bfd_get_arch (info->abfd) != bfd_arch_obscure)
|
||
info->bfd_arch_info = bfd_get_arch_info (info->abfd);
|
||
/* From the target. */
|
||
if (info->target_desc != NULL)
|
||
info->bfd_arch_info = choose_architecture_for_target
|
||
(info->target_desc, info->bfd_arch_info);
|
||
/* From the default. */
|
||
if (info->bfd_arch_info == NULL)
|
||
info->bfd_arch_info = default_bfd_arch;
|
||
|
||
/* "(gdb) set byte-order ...". */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& target_byte_order_user != BFD_ENDIAN_UNKNOWN)
|
||
info->byte_order = target_byte_order_user;
|
||
/* From the INFO struct. */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& info->abfd != NULL)
|
||
info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
|
||
: bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
|
||
: BFD_ENDIAN_UNKNOWN);
|
||
/* From the default. */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN)
|
||
info->byte_order = default_byte_order;
|
||
info->byte_order_for_code = info->byte_order;
|
||
|
||
/* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
|
||
/* From the manual override, or from file. */
|
||
if (info->osabi == GDB_OSABI_UNINITIALIZED)
|
||
info->osabi = gdbarch_lookup_osabi (info->abfd);
|
||
/* From the target. */
|
||
if (info->osabi == GDB_OSABI_UNKNOWN && info->target_desc != NULL)
|
||
info->osabi = tdesc_osabi (info->target_desc);
|
||
/* From the configured default. */
|
||
#ifdef GDB_OSABI_DEFAULT
|
||
if (info->osabi == GDB_OSABI_UNKNOWN)
|
||
info->osabi = GDB_OSABI_DEFAULT;
|
||
#endif
|
||
|
||
/* Must have at least filled in the architecture. */
|
||
gdb_assert (info->bfd_arch_info != NULL);
|
||
}
|
||
|
||
/* Return "current" architecture. If the target is running, this is
|
||
the architecture of the selected frame. Otherwise, the "current"
|
||
architecture defaults to the target architecture.
|
||
|
||
This function should normally be called solely by the command
|
||
interpreter routines to determine the architecture to execute a
|
||
command in. */
|
||
struct gdbarch *
|
||
get_current_arch (void)
|
||
{
|
||
if (has_stack_frames ())
|
||
return get_frame_arch (get_selected_frame (NULL));
|
||
else
|
||
return target_gdbarch;
|
||
}
|
||
|
||
int
|
||
default_has_shared_address_space (struct gdbarch *gdbarch)
|
||
{
|
||
/* Simply say no. In most unix-like targets each inferior/process
|
||
has its own address space. */
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
default_fast_tracepoint_valid_at (struct gdbarch *gdbarch,
|
||
CORE_ADDR addr, int *isize, char **msg)
|
||
{
|
||
/* We don't know if maybe the target has some way to do fast
|
||
tracepoints that doesn't need gdbarch, so always say yes. */
|
||
if (msg)
|
||
*msg = NULL;
|
||
return 1;
|
||
}
|
||
|
||
void
|
||
default_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
|
||
int *kindptr)
|
||
{
|
||
gdbarch_breakpoint_from_pc (gdbarch, pcptr, kindptr);
|
||
}
|
||
|
||
void
|
||
default_gen_return_address (struct gdbarch *gdbarch,
|
||
struct agent_expr *ax, struct axs_value *value,
|
||
CORE_ADDR scope)
|
||
{
|
||
error (_("This architecture has no method to collect a return address."));
|
||
}
|
||
|
||
enum target_signal
|
||
default_target_signal_from_host (struct gdbarch *gdbarch, int signo)
|
||
{
|
||
return target_signal_from_host (signo);
|
||
}
|
||
|
||
/* */
|
||
|
||
/* -Wmissing-prototypes */
|
||
extern initialize_file_ftype _initialize_gdbarch_utils;
|
||
|
||
void
|
||
_initialize_gdbarch_utils (void)
|
||
{
|
||
add_setshow_enum_cmd ("endian", class_support,
|
||
endian_enum, &set_endian_string,
|
||
_("Set endianness of target."),
|
||
_("Show endianness of target."),
|
||
NULL, set_endian, show_endian,
|
||
&setlist, &showlist);
|
||
}
|