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binutils-gdb/gdb/arch-utils.c
Kevin Buettner 39f770628a Phase 1 of the ptid_t changes.
2001-05-04 04:15:33 +00:00

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/* Dynamic architecture support for GDB, the GNU debugger.
Copyright 1998, 1999, 2000, 2001 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"
#if GDB_MULTI_ARCH
#include "gdbcmd.h"
#include "inferior.h" /* enum CALL_DUMMY_LOCATION et.al. */
#else
/* Just include everything in sight so that the every old definition
of macro is visible. */
#include "gdb_string.h"
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "breakpoint.h"
#include "gdb_wait.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "target.h"
#include "annotate.h"
#endif
#include "regcache.h"
#include "version.h"
#include "floatformat.h"
/* Use the program counter to determine the contents and size
of a breakpoint instruction. If no target-dependent macro
BREAKPOINT_FROM_PC has been defined to implement this function,
assume that the breakpoint doesn't depend on the PC, and
use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
Return a pointer to a string of bytes that encode a breakpoint
instruction, stores the length of the string to *lenptr,
and optionally adjust the pc to point to the correct memory location
for inserting the breakpoint. */
unsigned char *
legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
{
/* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
breakpoint. On some machines, breakpoints are handled by the
target environment and we don't have to worry about them here. */
#ifdef BIG_BREAKPOINT
if (TARGET_BYTE_ORDER == BIG_ENDIAN)
{
static unsigned char big_break_insn[] = BIG_BREAKPOINT;
*lenptr = sizeof (big_break_insn);
return big_break_insn;
}
#endif
#ifdef LITTLE_BREAKPOINT
if (TARGET_BYTE_ORDER != BIG_ENDIAN)
{
static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
*lenptr = sizeof (little_break_insn);
return little_break_insn;
}
#endif
#ifdef BREAKPOINT
{
static unsigned char break_insn[] = BREAKPOINT;
*lenptr = sizeof (break_insn);
return break_insn;
}
#endif
*lenptr = 0;
return NULL;
}
int
generic_frameless_function_invocation_not (struct frame_info *fi)
{
return 0;
}
int
generic_return_value_on_stack_not (struct type *type)
{
return 0;
}
char *
legacy_register_name (int i)
{
#ifdef REGISTER_NAMES
static char *names[] = REGISTER_NAMES;
if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
return NULL;
else
return names[i];
#else
internal_error (__FILE__, __LINE__,
"legacy_register_name: called.");
return NULL;
#endif
}
#if defined (CALL_DUMMY)
LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
#else
LONGEST legacy_call_dummy_words[1];
#endif
int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
void
generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
CORE_ADDR * rem_addr, int *rem_len)
{
*rem_addr = gdb_addr;
*rem_len = gdb_len;
}
int
generic_prologue_frameless_p (CORE_ADDR ip)
{
#ifdef SKIP_PROLOGUE_FRAMELESS_P
return ip == SKIP_PROLOGUE_FRAMELESS_P (ip);
#else
return ip == SKIP_PROLOGUE (ip);
#endif
}
/* Helper functions for 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);
}
/* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
const struct floatformat *
default_float_format (struct gdbarch *gdbarch)
{
#if GDB_MULTI_ARCH
int byte_order = gdbarch_byte_order (gdbarch);
#else
int byte_order = TARGET_BYTE_ORDER;
#endif
switch (byte_order)
{
case BIG_ENDIAN:
return &floatformat_ieee_single_big;
case LITTLE_ENDIAN:
return &floatformat_ieee_single_little;
default:
internal_error (__FILE__, __LINE__,
"default_float_format: bad byte order");
}
}
const struct floatformat *
default_double_format (struct gdbarch *gdbarch)
{
#if GDB_MULTI_ARCH
int byte_order = gdbarch_byte_order (gdbarch);
#else
int byte_order = TARGET_BYTE_ORDER;
#endif
switch (byte_order)
{
case BIG_ENDIAN:
return &floatformat_ieee_double_big;
case LITTLE_ENDIAN:
return &floatformat_ieee_double_little;
default:
internal_error (__FILE__, __LINE__,
"default_double_format: bad byte order");
}
}
/* Misc helper functions for targets. */
int
frame_num_args_unknown (struct frame_info *fi)
{
return -1;
}
int
generic_register_convertible_not (int num)
{
return 0;
}
int
default_register_sim_regno (int num)
{
return num;
}
CORE_ADDR
default_convert_from_func_ptr_addr (CORE_ADDR addr)
{
return addr;
}
int
no_op_reg_to_regnum (int reg)
{
return reg;
}
/* For use by frame_args_address and frame_locals_address. */
CORE_ADDR
default_frame_address (struct frame_info *fi)
{
return fi->frame;
}
/* Default prepare_to_procced(). */
int
default_prepare_to_proceed (int select_it)
{
return 0;
}
/* Generic prepare_to_proceed(). This one should be suitable for most
targets that support threads. */
int
generic_prepare_to_proceed (int select_it)
{
ptid_t wait_ptid;
struct target_waitstatus wait_status;
/* Get the last target status returned by target_wait(). */
get_last_target_status (&wait_ptid, &wait_status);
/* Make sure we were stopped at a breakpoint. */
if (wait_status.kind != TARGET_WAITKIND_STOPPED
|| wait_status.value.sig != TARGET_SIGNAL_TRAP)
{
return 0;
}
if (!ptid_equal (wait_ptid, minus_one_ptid)
&& !ptid_equal (inferior_ptid, wait_ptid))
{
/* Switched over from WAIT_PID. */
CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
/* Avoid switching where it wouldn't do any good, i.e. if both
threads are at the same breakpoint. */
if (wait_pc != read_pc () && breakpoint_here_p (wait_pc))
{
if (select_it)
{
/* User hasn't deleted the breakpoint. Switch back to
WAIT_PID and return non-zero. */
inferior_ptid = wait_ptid;
/* FIXME: This stuff came from switch_to_thread() in
thread.c (which should probably be a public function). */
flush_cached_frames ();
registers_changed ();
stop_pc = wait_pc;
select_frame (get_current_frame (), 0);
}
return 1;
}
}
return 0;
}
/* Functions to manipulate the endianness of the target. */
#ifdef TARGET_BYTE_ORDER_SELECTABLE
/* compat - Catch old targets that expect a selectable byte-order to
default to BIG_ENDIAN */
#ifndef TARGET_BYTE_ORDER_DEFAULT
#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
#endif
#endif
#if !TARGET_BYTE_ORDER_SELECTABLE_P
#ifndef TARGET_BYTE_ORDER_DEFAULT
/* compat - Catch old non byte-order selectable targets that do not
define TARGET_BYTE_ORDER_DEFAULT and instead expect
TARGET_BYTE_ORDER to be used as the default. For targets that
defined neither TARGET_BYTE_ORDER nor TARGET_BYTE_ORDER_DEFAULT the
below will get a strange compiler warning. */
#define TARGET_BYTE_ORDER_DEFAULT TARGET_BYTE_ORDER
#endif
#endif
#ifndef TARGET_BYTE_ORDER_DEFAULT
#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN /* arbitrary */
#endif
/* ``target_byte_order'' is only used when non- multi-arch.
Multi-arch targets obtain the current byte order using
TARGET_BYTE_ORDER which is controlled by gdbarch.*. */
int target_byte_order = TARGET_BYTE_ORDER_DEFAULT;
int target_byte_order_auto = 1;
static const char endian_big[] = "big";
static const char endian_little[] = "little";
static const char endian_auto[] = "auto";
static const char *endian_enum[] =
{
endian_big,
endian_little,
endian_auto,
NULL,
};
static const char *set_endian_string;
/* Called by ``show endian''. */
static void
show_endian (char *args, int from_tty)
{
if (TARGET_BYTE_ORDER_AUTO)
printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
(TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
else
printf_unfiltered ("The target is assumed to be %s endian\n",
(TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little"));
}
static void
set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
{
if (!TARGET_BYTE_ORDER_SELECTABLE_P)
{
printf_unfiltered ("Byte order is not selectable.");
}
else if (set_endian_string == endian_auto)
{
target_byte_order_auto = 1;
}
else if (set_endian_string == endian_little)
{
target_byte_order_auto = 0;
if (GDB_MULTI_ARCH)
{
struct gdbarch_info info;
memset (&info, 0, sizeof info);
info.byte_order = LITTLE_ENDIAN;
if (! gdbarch_update_p (info))
{
printf_unfiltered ("Little endian target not supported by GDB\n");
}
}
else
{
target_byte_order = LITTLE_ENDIAN;
}
}
else if (set_endian_string == endian_big)
{
target_byte_order_auto = 0;
if (GDB_MULTI_ARCH)
{
struct gdbarch_info info;
memset (&info, 0, sizeof info);
info.byte_order = BIG_ENDIAN;
if (! gdbarch_update_p (info))
{
printf_unfiltered ("Big endian target not supported by GDB\n");
}
}
else
{
target_byte_order = BIG_ENDIAN;
}
}
else
internal_error (__FILE__, __LINE__,
"set_endian: bad value");
show_endian (NULL, from_tty);
}
/* Set the endianness from a BFD. */
static void
set_endian_from_file (bfd *abfd)
{
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"set_endian_from_file: not for multi-arch");
if (TARGET_BYTE_ORDER_SELECTABLE_P)
{
int want;
if (bfd_big_endian (abfd))
want = BIG_ENDIAN;
else
want = LITTLE_ENDIAN;
if (TARGET_BYTE_ORDER_AUTO)
target_byte_order = want;
else if (TARGET_BYTE_ORDER != want)
warning ("%s endian file does not match %s endian target.",
want == BIG_ENDIAN ? "big" : "little",
TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
}
else
{
if (bfd_big_endian (abfd)
? TARGET_BYTE_ORDER != BIG_ENDIAN
: TARGET_BYTE_ORDER == BIG_ENDIAN)
warning ("%s endian file does not match %s endian target.",
bfd_big_endian (abfd) ? "big" : "little",
TARGET_BYTE_ORDER == BIG_ENDIAN ? "big" : "little");
}
}
/* Functions to manipulate the architecture of the target */
enum set_arch { set_arch_auto, set_arch_manual };
int target_architecture_auto = 1;
const char *set_architecture_string;
/* Old way of changing the current architecture. */
extern const struct bfd_arch_info bfd_default_arch_struct;
const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
int (*target_architecture_hook) (const struct bfd_arch_info *ap);
static int
arch_ok (const struct bfd_arch_info *arch)
{
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"arch_ok: not multi-arched");
/* Should be performing the more basic check that the binary is
compatible with GDB. */
/* Check with the target that the architecture is valid. */
return (target_architecture_hook == NULL
|| target_architecture_hook (arch));
}
static void
set_arch (const struct bfd_arch_info *arch,
enum set_arch type)
{
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"set_arch: not multi-arched");
switch (type)
{
case set_arch_auto:
if (!arch_ok (arch))
warning ("Target may not support %s architecture",
arch->printable_name);
target_architecture = arch;
break;
case set_arch_manual:
if (!arch_ok (arch))
{
printf_unfiltered ("Target does not support `%s' architecture.\n",
arch->printable_name);
}
else
{
target_architecture_auto = 0;
target_architecture = arch;
}
break;
}
if (gdbarch_debug)
gdbarch_dump (current_gdbarch, gdb_stdlog);
}
/* Set the architecture from arch/machine (deprecated) */
void
set_architecture_from_arch_mach (enum bfd_architecture arch,
unsigned long mach)
{
const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"set_architecture_from_arch_mach: not multi-arched");
if (wanted != NULL)
set_arch (wanted, set_arch_manual);
else
internal_error (__FILE__, __LINE__,
"gdbarch: hardwired architecture/machine not recognized");
}
/* Set the architecture from a BFD (deprecated) */
static void
set_architecture_from_file (bfd *abfd)
{
const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"set_architecture_from_file: not multi-arched");
if (target_architecture_auto)
{
set_arch (wanted, set_arch_auto);
}
else if (wanted != target_architecture)
{
warning ("%s architecture file may be incompatible with %s target.",
wanted->printable_name,
target_architecture->printable_name);
}
}
/* Called if the user enters ``show architecture'' without an
argument. */
static void
show_architecture (char *args, int from_tty)
{
const char *arch;
arch = TARGET_ARCHITECTURE->printable_name;
if (target_architecture_auto)
printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
else
printf_filtered ("The target architecture is assumed to be %s\n", arch);
}
/* 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)
{
if (strcmp (set_architecture_string, "auto") == 0)
{
target_architecture_auto = 1;
}
else if (GDB_MULTI_ARCH)
{
struct gdbarch_info info;
memset (&info, 0, sizeof info);
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_auto = 0;
else
printf_unfiltered ("Architecture `%s' not recognized.\n",
set_architecture_string);
}
else
{
const struct bfd_arch_info *arch
= bfd_scan_arch (set_architecture_string);
if (arch == NULL)
internal_error (__FILE__, __LINE__,
"set_architecture: bfd_scan_arch failed");
set_arch (arch, set_arch_manual);
}
show_architecture (NULL, from_tty);
}
/* Called if the user enters ``info architecture'' without an argument. */
static void
info_architecture (char *args, int from_tty)
{
printf_filtered ("Available architectures are:\n");
if (GDB_MULTI_ARCH)
{
const char **arches = gdbarch_printable_names ();
const char **arch;
for (arch = arches; *arch != NULL; arch++)
{
printf_filtered (" %s", *arch);
}
xfree (arches);
}
else
{
enum bfd_architecture a;
for (a = bfd_arch_obscure + 1; a < bfd_arch_last; a++)
{
const struct bfd_arch_info *ap;
for (ap = bfd_lookup_arch (a, 0);
ap != NULL;
ap = ap->next)
{
printf_filtered (" %s", ap->printable_name);
ap = ap->next;
}
}
}
printf_filtered ("\n");
}
/* Set the dynamic target-system-dependent parameters (architecture,
byte-order) using information found in the BFD */
void
set_gdbarch_from_file (bfd *abfd)
{
if (GDB_MULTI_ARCH)
{
struct gdbarch_info info;
memset (&info, 0, sizeof info);
info.abfd = abfd;
if (! gdbarch_update_p (info))
error ("Architecture of file not recognized.\n");
}
else
{
set_architecture_from_file (abfd);
set_endian_from_file (abfd);
}
}
/* 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
void
initialize_current_architecture (void)
{
const char **arches = gdbarch_printable_names ();
/* determine a default architecture and byte order. */
struct gdbarch_info info;
memset (&info, 0, sizeof (info));
/* Find a default architecture. */
if (info.bfd_arch_info == NULL
&& default_bfd_arch != NULL)
info.bfd_arch_info = default_bfd_arch;
if (info.bfd_arch_info == 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");
info.bfd_arch_info = bfd_scan_arch (chosen);
if (info.bfd_arch_info == NULL)
internal_error (__FILE__, __LINE__,
"initialize_current_architecture: Arch not found");
}
/* take several guesses at a byte order. */
/* NB: can't use TARGET_BYTE_ORDER_DEFAULT as its definition is
forced above. */
if (info.byte_order == 0
&& default_bfd_vec != NULL)
{
/* Extract BFD's default vector's byte order. */
switch (default_bfd_vec->byteorder)
{
case BFD_ENDIAN_BIG:
info.byte_order = BIG_ENDIAN;
break;
case BFD_ENDIAN_LITTLE:
info.byte_order = LITTLE_ENDIAN;
break;
default:
break;
}
}
if (info.byte_order == 0)
{
/* 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)
info.byte_order = LITTLE_ENDIAN;
}
if (info.byte_order == 0)
{
/* Wire it to big-endian!!! */
info.byte_order = BIG_ENDIAN;
}
if (GDB_MULTI_ARCH)
{
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. */
{
struct cmd_list_element *c;
/* 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;
/* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
of ``const char *''. We just happen to know that the casts are
safe. */
c = add_set_enum_cmd ("architecture", class_support,
arches, &set_architecture_string,
"Set architecture of target.",
&setlist);
c->function.sfunc = set_architecture;
add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
/* Don't use set_from_show - need to print both auto/manual and
current setting. */
add_cmd ("architecture", class_support, show_architecture,
"Show the current target architecture", &showlist);
c = add_cmd ("architecture", class_support, info_architecture,
"List supported target architectures", &infolist);
deprecate_cmd (c, "set architecture");
}
}
/* */
extern initialize_file_ftype _initialize_gdbarch_utils;
void
_initialize_gdbarch_utils (void)
{
struct cmd_list_element *c;
c = add_set_enum_cmd ("endian", class_support,
endian_enum, &set_endian_string,
"Set endianness of target.",
&setlist);
c->function.sfunc = set_endian;
/* Don't use set_from_show - need to print both auto/manual and
current setting. */
add_cmd ("endian", class_support, show_endian,
"Show the current byte-order", &showlist);
}
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