/* Dynamic architecture support for GDB, the GNU debugger.
- Copyright (C) 1998-2016 Free Software Foundation, Inc.
+ Copyright (C) 1998-2021 Free Software Foundation, Inc.
This file is part of GDB.
#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 "language.h"
#include "symtab.h"
-#include "version.h"
+#include "gdbsupport/version.h"
#include "floatformat.h"
+#include "dis-asm.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)
+bool
+default_displaced_step_hw_singlestep (struct gdbarch *gdbarch)
{
return !gdbarch_software_single_step_p (gdbarch);
}
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
+ behaviour. The default should be one2one_register_sim_regno
(below). */
if (gdbarch_register_name (gdbarch, regnum) != NULL
&& gdbarch_register_name (gdbarch, regnum)[0] != '\0')
return LEGACY_SIM_REGNO_IGNORE;
}
+
+/* See arch-utils.h */
+
+std::string
+default_memtag_to_string (struct gdbarch *gdbarch, struct value *tag)
+{
+ error (_("This architecture has no method to convert a memory tag to"
+ " a string."));
+}
+
+/* See arch-utils.h */
+
+bool
+default_tagged_address_p (struct gdbarch *gdbarch, struct value *address)
+{
+ /* By default, assume the address is untagged. */
+ return false;
+}
+
+/* See arch-utils.h */
+
+bool
+default_memtag_matches_p (struct gdbarch *gdbarch, struct value *address)
+{
+ /* By default, assume the tags match. */
+ return true;
+}
+
+/* See arch-utils.h */
+
+bool
+default_set_memtags (struct gdbarch *gdbarch, struct value *address,
+ size_t length, const gdb::byte_vector &tags,
+ memtag_type tag_type)
+{
+ /* By default, return true (successful); */
+ return true;
+}
+
+/* See arch-utils.h */
+
+struct value *
+default_get_memtag (struct gdbarch *gdbarch, struct value *address,
+ memtag_type tag_type)
+{
+ /* By default, return no tag. */
+ return nullptr;
+}
+
CORE_ADDR
generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
return addr;
}
+/* See arch-utils.h. */
+
+bool
+default_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op,
+ struct dwarf2_frame_state *fs)
+{
+ return false;
+}
+
int
cannot_register_not (struct gdbarch *gdbarch, int regnum)
{
*frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch);
else if (gdbarch_sp_regnum (gdbarch) >= 0
&& gdbarch_sp_regnum (gdbarch)
- < gdbarch_num_regs (gdbarch))
+ < gdbarch_num_regs (gdbarch))
*frame_regnum = gdbarch_sp_regnum (gdbarch);
else
/* Should this be an internal error? I guess so, it is reflecting
{
const struct floatformat **format = NULL;
- if (len == gdbarch_half_bit (gdbarch))
+ /* Check if this is a bfloat16 type. It has the same size as the
+ IEEE half float type, so we use the base type name to tell them
+ apart. */
+ if (name != nullptr && strcmp (name, "__bf16") == 0
+ && len == gdbarch_bfloat16_bit (gdbarch))
+ format = gdbarch_bfloat16_format (gdbarch);
+ else if (len == gdbarch_half_bit (gdbarch))
format = gdbarch_half_format (gdbarch);
else if (len == gdbarch_float_bit (gdbarch))
format = gdbarch_float_format (gdbarch);
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"));
+ "(currently big endian).\n"));
else
fprintf_unfiltered (file, _("The target endianness is set automatically "
- "(currently little endian)\n"));
+ "(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"));
+ _("The target is set to big endian.\n"));
else
fprintf_unfiltered (file,
- _("The target is assumed to be little endian\n"));
+ _("The target is set to little endian.\n"));
}
static void
-set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
+set_endian (const 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;
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
+ of the architecture associated with TARGET_DESC, return the
more specific of the two.
If SELECTED is a different architecture, but it is accepted as
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"),
+ fprintf_filtered (file, _("The target architecture is set to "
+ "\"auto\" (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"),
+ fprintf_filtered (file, _("The target architecture is set to \"%s\".\n"),
set_architecture_string);
}
argument. */
static void
-set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
+set_architecture (const 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;
/* Check for the current file. */
if (info.abfd == NULL)
- info.abfd = exec_bfd;
+ info.abfd = current_program_space->exec_bfd ();
if (info.abfd == NULL)
info.abfd = core_bfd;
gdbarch_from_bfd (bfd *abfd)
{
struct gdbarch_info info;
- gdbarch_info_init (&info);
info.abfd = abfd;
return gdbarch_find_by_info (info);
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);
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)
_("initialize_current_architecture: Arch not found"));
}
+ gdbarch_info info;
info.bfd_arch_info = default_bfd_arch;
/* Take several guesses at a byte order. */
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);
+ set_show_commands architecture_cmds
+ = 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_cmds.set, 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. */
if (info->byte_order == BFD_ENDIAN_UNKNOWN)
info->byte_order = default_byte_order;
info->byte_order_for_code = info->byte_order;
+ /* Wire the default to the last selected byte order. */
+ default_byte_order = info->byte_order;
/* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
/* From the manual override, or from file. */
- if (info->osabi == GDB_OSABI_UNINITIALIZED)
+ if (info->osabi == GDB_OSABI_UNKNOWN)
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. */
if (info->osabi == GDB_OSABI_UNKNOWN)
info->osabi = GDB_OSABI_DEFAULT;
#endif
+ /* If we still don't know which osabi to pick, pick none. */
+ if (info->osabi == GDB_OSABI_UNKNOWN)
+ info->osabi = GDB_OSABI_NONE;
/* Must have at least filled in the architecture. */
gdb_assert (info->bfd_arch_info != NULL);
int
default_fast_tracepoint_valid_at (struct gdbarch *gdbarch, CORE_ADDR addr,
- char **msg)
+ std::string *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;
+ msg->clear ();
return 1;
}
return gdbarch_sw_breakpoint_from_kind (gdbarch, kind, lenptr);
}
+int
+default_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ CORE_ADDR *pcptr)
+{
+ return gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr);
+}
+
void
default_gen_return_address (struct gdbarch *gdbarch,
/* 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);
+ return !(language_pass_by_reference (type).trivially_copyable);
}
int default_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr)
return 0;
}
+/* See arch-utils.h. */
+
+bool
+default_program_breakpoint_here_p (struct gdbarch *gdbarch,
+ CORE_ADDR address)
+{
+ int len;
+ const gdb_byte *bpoint = gdbarch_breakpoint_from_pc (gdbarch, &address, &len);
+
+ /* Software breakpoints unsupported? */
+ if (bpoint == nullptr)
+ return false;
+
+ gdb_byte *target_mem = (gdb_byte *) alloca (len);
+
+ /* Enable the automatic memory restoration from breakpoints while
+ we read the memory. Otherwise we may find temporary breakpoints, ones
+ inserted by GDB, and flag them as permanent breakpoints. */
+ scoped_restore restore_memory
+ = make_scoped_restore_show_memory_breakpoints (0);
+
+ if (target_read_memory (address, target_mem, len) == 0)
+ {
+ /* Check if this is a breakpoint instruction for this architecture,
+ including ones used by GDB. */
+ if (memcmp (target_mem, bpoint, len) == 0)
+ return true;
+ }
+
+ return false;
+}
+
void
default_skip_permanent_breakpoint (struct regcache *regcache)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = regcache->arch ();
CORE_ADDR current_pc = regcache_read_pc (regcache);
int bp_len;
/* -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 *
+std::string
default_gcc_target_options (struct gdbarch *gdbarch)
{
- return xstrprintf ("-m%d%s", gdbarch_ptr_bit (gdbarch),
- gdbarch_ptr_bit (gdbarch) == 64 ? " -mcmodel=large" : "");
+ return string_printf ("-m%d%s", gdbarch_ptr_bit (gdbarch),
+ (gdbarch_ptr_bit (gdbarch) == 64
+ ? " -mcmodel=large" : ""));
}
/* gdbarch gnu_triplet_regexp method. */
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. */
+/* Default method for gdbarch_addressable_memory_unit_size. The default is
+ based on the bits_per_byte defined in the bfd library for the current
+ architecture, this is usually 8-bits, and so this function will usually
+ return 1 indicating 1 byte is 1 octet. */
int
default_addressable_memory_unit_size (struct gdbarch *gdbarch)
{
- return 1;
+ return gdbarch_bfd_arch_info (gdbarch)->bits_per_byte / 8;
}
void
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);
+ regcache->raw_supply (pc_regno, regs);
}
-/* -Wmissing-prototypes */
-extern initialize_file_ftype _initialize_gdbarch_utils;
+int
+default_print_insn (bfd_vma memaddr, disassemble_info *info)
+{
+ disassembler_ftype disassemble_fn;
+
+ disassemble_fn = disassembler (info->arch, info->endian == BFD_ENDIAN_BIG,
+ info->mach, current_program_space->exec_bfd ());
+
+ gdb_assert (disassemble_fn != NULL);
+ return (*disassemble_fn) (memaddr, info);
+}
+
+/* See arch-utils.h. */
+
+CORE_ADDR
+gdbarch_skip_prologue_noexcept (gdbarch *gdbarch, CORE_ADDR pc) noexcept
+{
+ CORE_ADDR new_pc = pc;
+
+ try
+ {
+ new_pc = gdbarch_skip_prologue (gdbarch, pc);
+ }
+ catch (const gdb_exception &ex)
+ {}
+
+ return new_pc;
+}
+
+/* See arch-utils.h. */
+
+bool
+default_in_indirect_branch_thunk (gdbarch *gdbarch, CORE_ADDR pc)
+{
+ return false;
+}
+
+/* See arch-utils.h. */
+
+ULONGEST
+default_type_align (struct gdbarch *gdbarch, struct type *type)
+{
+ return 0;
+}
+
+/* See arch-utils.h. */
+
+std::string
+default_get_pc_address_flags (frame_info *frame, CORE_ADDR pc)
+{
+ return "";
+}
+
+/* See arch-utils.h. */
+void
+default_read_core_file_mappings (struct gdbarch *gdbarch,
+ struct bfd *cbfd,
+ gdb::function_view<void (ULONGEST count)>
+ pre_loop_cb,
+ gdb::function_view<void (int num,
+ ULONGEST start,
+ ULONGEST end,
+ ULONGEST file_ofs,
+ const char *filename)>
+ loop_cb)
+{
+}
+void _initialize_gdbarch_utils ();
void
-_initialize_gdbarch_utils (void)
+_initialize_gdbarch_utils ()
{
add_setshow_enum_cmd ("endian", class_support,
endian_enum, &set_endian_string,
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