binutils-gdb/gdb/arch-utils.c

832 lines
21 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* 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 "arch-utils.h"
#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 "gdb_assert.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 == BFD_ENDIAN_BIG)
{
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 != BFD_ENDIAN_BIG)
{
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;
}
CORE_ADDR
generic_skip_trampoline_code (CORE_ADDR pc)
{
return 0;
}
int
generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
{
return 0;
}
int
generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
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
}
/* New/multi-arched targets should use the correct gdbarch field
instead of using this global pointer. */
int
legacy_print_insn (bfd_vma vma, disassemble_info *info)
{
return (*tm_print_insn) (vma, info);
}
/* 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 BFD_ENDIAN_BIG:
return &floatformat_ieee_single_big;
case BFD_ENDIAN_LITTLE:
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 BFD_ENDIAN_BIG:
return &floatformat_ieee_double_big;
case BFD_ENDIAN_LITTLE:
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;
}
/* Under some ABI's that specify the `struct convention' for returning
structures by value, by the time we've returned from the function,
the return value is sitting there in the caller's buffer, but GDB
has no way to find the address of that buffer.
On such architectures, use this function as your
extract_struct_value_address method. When asked to a struct
returned by value in this fashion, GDB will print a nice error
message, instead of garbage. */
CORE_ADDR
generic_cannot_extract_struct_value_address (char *dummy)
{
return 0;
}
int
default_register_sim_regno (int num)
{
return num;
}
CORE_ADDR
core_addr_identity (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 either at a breakpoint, or because
of a Ctrl-C. */
if (wait_status.kind != TARGET_WAITKIND_STOPPED
|| (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
wait_status.value.sig != TARGET_SIGNAL_INT))
{
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);
if (wait_pc != read_pc ())
{
if (select_it)
{
/* Switch back to WAIT_PID thread. */
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);
}
/* We return 1 to indicate that there is a breakpoint here,
so we need to step over it before continuing to avoid
hitting it straight away. */
if (breakpoint_here_p (wait_pc))
{
return 1;
}
}
}
return 0;
}
void
init_frame_pc_noop (int fromleaf, struct frame_info *prev)
{
return;
}
void
init_frame_pc_default (int fromleaf, struct frame_info *prev)
{
if (fromleaf)
prev->pc = SAVED_PC_AFTER_CALL (prev->next);
else if (prev->next != NULL)
prev->pc = FRAME_SAVED_PC (prev->next);
else
prev->pc = read_pc ();
}
int
cannot_register_not (int regnum)
{
return 0;
}
/* Legacy version of target_virtual_frame_pointer(). Assumes that
there is an FP_REGNUM and that it is the same, cooked or raw. */
void
legacy_virtual_frame_pointer (CORE_ADDR pc,
int *frame_regnum,
LONGEST *frame_offset)
{
gdb_assert (FP_REGNUM >= 0);
*frame_regnum = FP_REGNUM;
*frame_offset = 0;
}
/* Assume the world is flat. Every register is large enough to fit a
target integer. */
int
generic_register_raw_size (int regnum)
{
gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
return TARGET_INT_BIT / HOST_CHAR_BIT;
}
/* Assume the virtual size corresponds to the virtual type. */
int
generic_register_virtual_size (int regnum)
{
return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum));
}
/* Functions to manipulate the endianness of the target. */
#ifndef TARGET_BYTE_ORDER_DEFAULT
#define TARGET_BYTE_ORDER_DEFAULT BFD_ENDIAN_BIG /* 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 == BFD_ENDIAN_BIG ? "big" : "little"));
else
printf_unfiltered ("The target is assumed to be %s endian\n",
(TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
}
static void
set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
{
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;
gdbarch_info_init (&info);
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 = BFD_ENDIAN_LITTLE;
}
}
else if (set_endian_string == endian_big)
{
target_byte_order_auto = 0;
if (GDB_MULTI_ARCH)
{
struct gdbarch_info info;
gdbarch_info_init (&info);
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 = BFD_ENDIAN_BIG;
}
}
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)
{
int want;
if (GDB_MULTI_ARCH)
internal_error (__FILE__, __LINE__,
"set_endian_from_file: not for multi-arch");
if (bfd_big_endian (abfd))
want = BFD_ENDIAN_BIG;
else
want = BFD_ENDIAN_LITTLE;
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 == BFD_ENDIAN_BIG ? "big" : "little",
TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "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;
gdbarch_info_init (&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);
}
/* 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;
gdbarch_info_init (&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;
gdbarch_info_init (&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 == BFD_ENDIAN_UNKNOWN
&& default_bfd_vec != NULL)
{
/* Extract BFD's default vector's byte order. */
switch (default_bfd_vec->byteorder)
{
case BFD_ENDIAN_BIG:
info.byte_order = BFD_ENDIAN_BIG;
break;
case BFD_ENDIAN_LITTLE:
info.byte_order = BFD_ENDIAN_LITTLE;
break;
default:
break;
}
}
if (info.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)
info.byte_order = BFD_ENDIAN_LITTLE;
}
if (info.byte_order == BFD_ENDIAN_UNKNOWN)
{
/* Wire it to big-endian!!! */
info.byte_order = BFD_ENDIAN_BIG;
}
if (GDB_MULTI_ARCH)
{
if (! gdbarch_update_p (info))
{
internal_error (__FILE__, __LINE__,
"initialize_current_architecture: Selection of initial architecture failed");
}
}
else
initialize_non_multiarch ();
/* 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);
}
}
/* Initialize a gdbarch info to values that will be automatically
overridden. Note: Originally, this ``struct info'' was initialized
using memset(0). Unfortunatly, 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;
}
/* */
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);
}