/* Dynamic architecture support for GDB, the GNU debugger.
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ 2008, 2009, 2010 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
+ 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,
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "osabi.h"
#include "target-descriptions.h"
+#include "objfiles.h"
#include "version.h"
#include "floatformat.h"
-/* Implementation of extract return value that grubs around in the
- register cache. */
-void
-legacy_extract_return_value (struct type *type, struct regcache *regcache,
- gdb_byte *valbuf)
+
+struct displaced_step_closure *
+simple_displaced_step_copy_insn (struct gdbarch *gdbarch,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs)
{
- gdb_byte *registers = deprecated_grub_regcache_for_registers (regcache);
- gdb_byte *buf = valbuf;
- DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
+ 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;
}
-/* Implementation of store return value that grubs the register cache.
- Takes a local copy of the buffer to avoid const problems. */
+
void
-legacy_store_return_value (struct type *type, struct regcache *regcache,
- const gdb_byte *buf)
+simple_displaced_step_free_closure (struct gdbarch *gdbarch,
+ struct displaced_step_closure *closure)
{
- gdb_byte *b = alloca (TYPE_LENGTH (type));
- gdb_assert (regcache == current_regcache);
- memcpy (b, buf, TYPE_LENGTH (type));
- DEPRECATED_STORE_RETURN_VALUE (type, b);
+ xfree (closure);
}
int
-always_use_struct_convention (int gcc_p, struct type *value_type)
+default_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
+ struct displaced_step_closure *closure)
{
- return 1;
+ return !gdbarch_software_single_step_p (gdbarch);
}
-enum return_value_convention
-legacy_return_value (struct gdbarch *gdbarch, struct type *valtype,
- struct regcache *regcache, gdb_byte *readbuf,
- const gdb_byte *writebuf)
+CORE_ADDR
+displaced_step_at_entry_point (struct gdbarch *gdbarch)
{
- /* NOTE: cagney/2004-06-13: The gcc_p parameter to
- USE_STRUCT_CONVENTION isn't used. */
- int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
- || TYPE_CODE (valtype) == TYPE_CODE_UNION
- || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
- && DEPRECATED_USE_STRUCT_CONVENTION (0, valtype));
+ CORE_ADDR addr;
+ int bp_len;
- if (writebuf != NULL)
- {
- gdb_assert (!struct_return);
- /* NOTE: cagney/2004-06-13: See stack.c:return_command. Old
- architectures don't expect STORE_RETURN_VALUE to handle small
- structures. Should not be called with such types. */
- gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_STRUCT
- && TYPE_CODE (valtype) != TYPE_CODE_UNION);
- STORE_RETURN_VALUE (valtype, regcache, writebuf);
- }
+ addr = entry_point_address ();
- if (readbuf != NULL)
- {
- gdb_assert (!struct_return);
- EXTRACT_RETURN_VALUE (valtype, regcache, readbuf);
- }
+ /* 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;
- if (struct_return)
- return RETURN_VALUE_STRUCT_CONVENTION;
- else
- return RETURN_VALUE_REGISTER_CONVENTION;
+ return addr;
}
int
-legacy_register_sim_regno (int regnum)
+legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum)
{
/* Only makes sense to supply raw registers. */
- gdb_assert (regnum >= 0 && regnum < NUM_REGS);
+ 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 (REGISTER_NAME (regnum) != NULL
- && REGISTER_NAME (regnum)[0] != '\0')
+ 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 (CORE_ADDR pc)
+generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
return 0;
}
}
int
-generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
+generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
+ CORE_ADDR pc, char *name)
{
return 0;
}
return 0;
}
-void
-generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
- struct regcache *regcache,
- CORE_ADDR gdb_addr, int gdb_len,
- CORE_ADDR * rem_addr, int *rem_len)
-{
- *rem_addr = gdb_addr;
- *rem_len = gdb_len;
-}
-
-/* Helper functions for INNER_THAN */
+/* Helper functions for gdbarch_inner_than */
int
core_addr_lessthan (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)
-{
- int byte_order = gdbarch_byte_order (gdbarch);
- 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)
-{
- int byte_order = gdbarch_byte_order (gdbarch);
- 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. */
CORE_ADDR
-core_addr_identity (CORE_ADDR addr)
+core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr)
{
return addr;
}
}
int
-no_op_reg_to_regnum (int reg)
+no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg)
{
return reg;
}
}
int
-cannot_register_not (int regnum)
+cannot_register_not (struct gdbarch *gdbarch, int regnum)
{
return 0;
}
/* Legacy version of target_virtual_frame_pointer(). Assumes that
- there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
+ there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
raw. */
void
-legacy_virtual_frame_pointer (CORE_ADDR pc,
+legacy_virtual_frame_pointer (struct gdbarch *gdbarch,
+ CORE_ADDR pc,
int *frame_regnum,
LONGEST *frame_offset)
{
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 (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
- *frame_regnum = DEPRECATED_FP_REGNUM;
- else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
- *frame_regnum = SP_REGNUM;
+ 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. */
*frame_offset = 0;
}
-/* Assume the world is sane, every register's virtual and real size
- is identical. */
-
-int
-generic_register_size (int regnum)
-{
- gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
- return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
-}
-
-/* Assume all registers are adjacent. */
-
-int
-generic_register_byte (int regnum)
-{
- int byte;
- int i;
- gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
- byte = 0;
- for (i = 0; i < regnum; i++)
- {
- byte += generic_register_size (i);
- }
- return byte;
-}
-
\f
int
-legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
-{
-#if defined (DEPRECATED_IN_SIGTRAMP)
- return DEPRECATED_IN_SIGTRAMP (pc, name);
-#else
- return name && strcmp ("_sigtramp", name) == 0;
-#endif
-}
-
-int
-generic_convert_register_p (int regnum, struct type *type)
+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)
{
- if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()
- && DEPRECATED_REG_STRUCT_HAS_ADDR (processing_gcc_compilation, type))
- {
- CHECK_TYPEDEF (type);
-
- return (TYPE_CODE (type) == TYPE_CODE_STRUCT
- || TYPE_CODE (type) == TYPE_CODE_UNION
- || TYPE_CODE (type) == TYPE_CODE_SET
- || TYPE_CODE (type) == TYPE_CODE_BITSTRING);
- }
-
return 0;
}
return 0;
}
+int
+default_remote_register_number (struct gdbarch *gdbarch,
+ int regno)
+{
+ return regno;
+}
+
\f
/* Functions to manipulate the endianness of the target. */
};
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 (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ 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 == BFD_ENDIAN_BIG)
+ if (target_byte_order_user == BFD_ENDIAN_BIG)
fprintf_unfiltered (file,
_("The target is assumed to be big endian\n"));
else
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 };
show_architecture (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- const char *arch;
- arch = TARGET_ARCHITECTURE->printable_name;
if (target_architecture_user == NULL)
fprintf_filtered (file, _("\
-The target architecture is set automatically (currently %s)\n"), arch);
+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"), arch);
+The target architecture is assumed to be %s\n"), set_architecture_string);
}
int
gdbarch_update_p (struct gdbarch_info info)
{
- struct gdbarch *new_gdbarch = gdbarch_find_by_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 it is the same old architecture, accept the request (but don't
swap anything). */
- if (new_gdbarch == current_gdbarch)
+ if (new_gdbarch == target_gdbarch)
{
if (gdbarch_debug)
fprintf_unfiltered (gdb_stdlog, "gdbarch_update_p: "
- "Architecture 0x%08lx (%s) unchanged\n",
- (long) new_gdbarch,
+ "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 0x%08lx (%s) selected\n",
- (long) new_gdbarch,
+ "New architecture %s (%s) selected\n",
+ host_address_to_string (new_gdbarch),
gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
- deprecated_current_gdbarch_select_hack (new_gdbarch);
+ deprecated_target_gdbarch_select_hack (new_gdbarch);
return 1;
}
struct gdbarch *
gdbarch_from_bfd (bfd *abfd)
{
- struct gdbarch *old_gdbarch = current_gdbarch;
- struct gdbarch *new_gdbarch;
struct gdbarch_info info;
-
- /* If we call gdbarch_find_by_info without filling in info.abfd,
- then it will use the global exec_bfd. That's fine if we don't
- have one of those either. And that's the only time we should
- reach here with a NULL ABFD argument - when we are discarding
- the executable. */
- gdb_assert (abfd != NULL || exec_bfd == NULL);
-
gdbarch_info_init (&info);
info.abfd = abfd;
return gdbarch_find_by_info (info);
void
set_gdbarch_from_file (bfd *abfd)
{
+ struct gdbarch_info info;
struct gdbarch *gdbarch;
- gdbarch = gdbarch_from_bfd (abfd);
+ 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_current_gdbarch_select_hack (gdbarch);
+ deprecated_target_gdbarch_select_hack (gdbarch);
}
/* Initialize the current architecture. Update the ``set
}
info.byte_order = default_byte_order;
+ info.byte_order_for_code = info.byte_order;
if (! gdbarch_update_p (info))
internal_error (__FILE__, __LINE__,
{
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;
}
void
gdbarch_info_fill (struct gdbarch_info *info)
{
- /* Check for the current file. */
- if (info->abfd == NULL)
- info->abfd = exec_bfd;
-
- /* Check for the current target description. */
- if (info->target_desc == NULL)
- info->target_desc = target_current_description ();
-
/* "(gdb) set architecture ...". */
if (info->bfd_arch_info == NULL
&& target_architecture_user)
&& 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;
/* 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;
+}
+
/* */
extern initialize_file_ftype _initialize_gdbarch_utils; /* -Wmissing-prototypes */
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