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binutils-gdb/gdb/arch-utils.c
Yao Qi 7eb895307f Skip unwritable frames in command "finish"
Nowadays, GDB can't insert breakpoint on the return address of the
exception handler on ARM M-profile, because the address is a magic
one 0xfffffff9,

 (gdb) bt
   CT32B1_IRQHandler () at ../src/timer.c:67
   <signal handler called>
   main () at ../src/timer.c:127

(gdb) info frame
Stack level 0, frame at 0x200ffa8:
 pc = 0x4ec in CT32B1_IRQHandler (../src/timer.c:67); saved pc = 0xfffffff9
 called by frame at 0x200ffc8
 source language c.
 Arglist at 0x200ffa0, args:
 Locals at 0x200ffa0, Previous frame's sp is 0x200ffa8
 Saved registers:
  r7 at 0x200ffa0, lr at 0x200ffa4

(gdb) x/x 0xfffffff9
0xfffffff9:     Cannot access memory at address 0xfffffff9

(gdb) finish
Run till exit from   CT32B1_IRQHandler () at ../src/timer.c:67
Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?)

Warning:
Cannot insert hardware breakpoint 0.
Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.

Command aborted.

even some debug probe can't set hardware breakpoint on the magic
address too,

(gdb) hbreak *0xfffffff9
Hardware assisted breakpoint 2 at 0xfffffff9
(gdb) c
Continuing.
Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?)

Warning:
Cannot insert hardware breakpoint 2.
Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.

Command aborted.

The problem described above is quite similar to PR 8841, in which GDB
can't set breakpoint on signal trampoline, which is mapped to a read-only
page by kernel.  The rationale of this patch is to skip "unwritable"
frames when looking for caller frames in command "finish", and a new
gdbarch method code_of_frame_writable is added.  This patch fixes
the problem on ARM cortex-m target, but it can be used to fix
PR 8841 too.

gdb:

2016-05-10  Yao Qi  <yao.qi@arm.com>

	* arch-utils.c (default_code_of_frame_writable): New function.
	* arch-utils.h (default_code_of_frame_writable): Declare.
	* arm-tdep.c (arm_code_of_frame_writable): New function.
	(arm_gdbarch_init): Install gdbarch method
	code_of_frame_writable if the target is M-profile.
	* frame.c (skip_unwritable_frames): New function.
	* frame.h (skip_unwritable_frames): Declare.
	* gdbarch.sh (code_of_frame_writable): New.
	* gdbarch.c, gdbarch.h: Re-generated.
	* infcmd.c (finish_command): Call skip_unwritable_frames.
2016-05-23 17:32:56 +01:00

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/* Dynamic architecture support for GDB, the GNU debugger.
Copyright (C) 1998-2016 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 "infrun.h"
#include "regcache.h"
#include "sim-regno.h"
#include "gdbcore.h"
#include "osabi.h"
#include "target-descriptions.h"
#include "objfiles.h"
#include "language.h"
#include "symtab.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 = (gdb_byte *) 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_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
return 0;
}
int
default_code_of_frame_writable (struct gdbarch *gdbarch,
struct frame_info *frame)
{
return 1;
}
/* 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_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
{
return;
}
/* See arch-utils.h. */
void
default_make_symbol_special (struct symbol *sym, struct objfile *objfile)
{
return;
}
/* See arch-utils.h. */
CORE_ADDR
default_adjust_dwarf2_addr (CORE_ADDR pc)
{
return pc;
}
/* See arch-utils.h. */
CORE_ADDR
default_adjust_dwarf2_line (CORE_ADDR addr, int rel)
{
return addr;
}
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;
}
/* See arch-utils.h. */
int
default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range)
{
return 0;
}
/* Functions to manipulate the endianness of the target. */
static enum bfd_endian 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 succeeds. */
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);
set_target_gdbarch (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."));
set_target_gdbarch (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 enum bfd_endian 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
&& startswith (chp - 2, "el"))
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 = XRESIZEVEC (const char *, arches, 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,
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."));
}
int
default_return_in_first_hidden_param_p (struct gdbarch *gdbarch,
struct type *type)
{
/* Usually, the return value's address is stored the in the "first hidden"
parameter if the return value should be passed by reference, as
specified in ABI. */
return language_pass_by_reference (type);
}
int default_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr)
{
return 0;
}
int default_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr)
{
return 0;
}
int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
{
return 0;
}
void
default_skip_permanent_breakpoint (struct regcache *regcache)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR current_pc = regcache_read_pc (regcache);
const gdb_byte *bp_insn;
int bp_len;
bp_insn = gdbarch_breakpoint_from_pc (gdbarch, &current_pc, &bp_len);
current_pc += bp_len;
regcache_write_pc (regcache, current_pc);
}
CORE_ADDR
default_infcall_mmap (CORE_ADDR size, unsigned prot)
{
error (_("This target does not support inferior memory allocation by mmap."));
}
void
default_infcall_munmap (CORE_ADDR addr, CORE_ADDR size)
{
/* Memory reserved by inferior mmap is kept leaked. */
}
/* -mcmodel=large is used so that no GOT (Global Offset Table) is needed to be
created in inferior memory by GDB (normally it is set by ld.so). */
char *
default_gcc_target_options (struct gdbarch *gdbarch)
{
return xstrprintf ("-m%d%s", gdbarch_ptr_bit (gdbarch),
gdbarch_ptr_bit (gdbarch) == 64 ? " -mcmodel=large" : "");
}
/* gdbarch gnu_triplet_regexp method. */
const char *
default_gnu_triplet_regexp (struct gdbarch *gdbarch)
{
return gdbarch_bfd_arch_info (gdbarch)->arch_name;
}
/* Default method for gdbarch_addressable_memory_unit_size. By default, a memory byte has
a size of 1 octet. */
int
default_addressable_memory_unit_size (struct gdbarch *gdbarch)
{
return 1;
}
void
default_guess_tracepoint_registers (struct gdbarch *gdbarch,
struct regcache *regcache,
CORE_ADDR addr)
{
int pc_regno = gdbarch_pc_regnum (gdbarch);
gdb_byte *regs;
/* This guessing code below only works if the PC register isn't
a pseudo-register. The value of a pseudo-register isn't stored
in the (non-readonly) regcache -- instead it's recomputed
(probably from some other cached raw register) whenever the
register is read. In this case, a custom method implementation
should be used by the architecture. */
if (pc_regno < 0 || pc_regno >= gdbarch_num_regs (gdbarch))
return;
regs = (gdb_byte *) alloca (register_size (gdbarch, pc_regno));
store_unsigned_integer (regs, register_size (gdbarch, pc_regno),
gdbarch_byte_order (gdbarch), addr);
regcache_raw_supply (regcache, pc_regno, regs);
}
/* -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);
}