/* OS ABI variant handling for GDB.
- Copyright 2001, 2002 Free Software Foundation, Inc.
+
+ Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#include "defs.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
#include "osabi.h"
+#include "arch-utils.h"
+#include "gdbcmd.h"
+#include "command.h"
#include "elf-bfd.h"
+#ifndef GDB_OSABI_DEFAULT
+#define GDB_OSABI_DEFAULT GDB_OSABI_UNKNOWN
+#endif
+
+/* State for the "set osabi" command. */
+static enum { osabi_auto, osabi_default, osabi_user } user_osabi_state;
+static enum gdb_osabi user_selected_osabi;
+static const char *gdb_osabi_available_names[GDB_OSABI_INVALID + 3] = {
+ "auto",
+ "default",
+ "none",
+ NULL
+};
+static const char *set_osabi_string;
/* This table matches the indices assigned to enum gdb_osabi. Keep
them in sync. */
static const char * const gdb_osabi_names[] =
{
- "<unknown>",
+ "none",
"SVR4",
"GNU/Hurd",
"FreeBSD ELF",
"NetBSD a.out",
"NetBSD ELF",
+ "OpenBSD ELF",
"Windows CE",
"DJGPP",
"NetWare",
+ "Irix",
"LynxOS",
+ "Interix",
+ "HP/UX ELF",
+ "HP/UX SOM",
"ARM EABI v1",
"ARM EABI v2",
"ARM APCS",
+ "QNX Neutrino",
+
+ "Cygwin",
"<invalid>"
};
struct gdb_osabi_handler
{
struct gdb_osabi_handler *next;
- enum bfd_architecture arch;
+ const struct bfd_arch_info *arch_info;
enum gdb_osabi osabi;
void (*init_osabi)(struct gdbarch_info, struct gdbarch *);
};
static struct gdb_osabi_handler *gdb_osabi_handler_list;
void
-gdbarch_register_osabi (enum bfd_architecture arch, enum gdb_osabi osabi,
+gdbarch_register_osabi (enum bfd_architecture arch, unsigned long machine,
+ enum gdb_osabi osabi,
void (*init_osabi)(struct gdbarch_info,
struct gdbarch *))
{
struct gdb_osabi_handler **handler_p;
+ const struct bfd_arch_info *arch_info = bfd_lookup_arch (arch, machine);
+ const char **name_ptr;
/* Registering an OS ABI handler for "unknown" is not allowed. */
if (osabi == GDB_OSABI_UNKNOWN)
"OS ABI \"%s\" for architecture %s was made. The handler will "
"not be registered",
gdbarch_osabi_name (osabi),
- bfd_printable_arch_mach (arch, 0));
+ bfd_printable_arch_mach (arch, machine));
return;
}
+ gdb_assert (arch_info);
+
for (handler_p = &gdb_osabi_handler_list; *handler_p != NULL;
handler_p = &(*handler_p)->next)
{
- if ((*handler_p)->arch == arch
+ if ((*handler_p)->arch_info == arch_info
&& (*handler_p)->osabi == osabi)
{
internal_error
"gdbarch_register_osabi: A handler for OS ABI \"%s\" "
"has already been registered for architecture %s",
gdbarch_osabi_name (osabi),
- bfd_printable_arch_mach (arch, 0));
+ arch_info->printable_name);
/* If user wants to continue, override previous definition. */
(*handler_p)->init_osabi = init_osabi;
return;
(*handler_p)
= (struct gdb_osabi_handler *) xmalloc (sizeof (struct gdb_osabi_handler));
(*handler_p)->next = NULL;
- (*handler_p)->arch = arch;
+ (*handler_p)->arch_info = arch_info;
(*handler_p)->osabi = osabi;
(*handler_p)->init_osabi = init_osabi;
+
+ /* Add this OS ABI to the list of enum values for "set osabi", if it isn't
+ already there. */
+ for (name_ptr = gdb_osabi_available_names; *name_ptr; name_ptr ++)
+ {
+ if (*name_ptr == gdbarch_osabi_name (osabi))
+ return;
+ }
+ *name_ptr++ = gdbarch_osabi_name (osabi);
+ *name_ptr = NULL;
}
\f
enum gdb_osabi osabi, match;
int match_specific;
+ /* If we aren't in "auto" mode, return the specified OS ABI. */
+ if (user_osabi_state == osabi_user)
+ return user_selected_osabi;
+
+ /* If we don't have a binary, return the default OS ABI (if set) or
+ an inconclusive result (otherwise). */
+ if (abfd == NULL)
+ {
+ if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN)
+ return GDB_OSABI_DEFAULT;
+ else
+ return GDB_OSABI_UNINITIALIZED;
+ }
+
match = GDB_OSABI_UNKNOWN;
match_specific = 0;
}
}
- return match;
+ /* If we didn't find a match, but a default was specified at configure
+ time, return the default. */
+ if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN && match == GDB_OSABI_UNKNOWN)
+ return GDB_OSABI_DEFAULT;
+ else
+ return match;
+}
+
+
+/* Return non-zero if architecture A can run code written for
+ architecture B. */
+static int
+can_run_code_for (const struct bfd_arch_info *a, const struct bfd_arch_info *b)
+{
+ /* 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.
+
+ 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. */
+ return (a == b || a->compatible (a, b) == a);
}
+
void
-gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch,
- enum gdb_osabi osabi)
+gdbarch_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdb_osabi_handler *handler;
- bfd *abfd = info.abfd;
- const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch);
- if (osabi == GDB_OSABI_UNKNOWN)
+ if (info.osabi == GDB_OSABI_UNKNOWN)
{
- /* Don't complain about not knowing the OS ABI if we don't
- have an inferior. */
- if (info.abfd)
- fprintf_filtered
- (gdb_stderr, "GDB doesn't recognize the OS ABI of the inferior. "
- "Attempting to continue with the default %s settings",
- bfd_printable_arch_mach (arch_info->arch, arch_info->mach));
+ /* Don't complain about an unknown OSABI. Assume the user knows
+ what they are doing. */
return;
}
for (handler = gdb_osabi_handler_list; handler != NULL;
handler = handler->next)
{
- if (handler->arch == bfd_get_arch (abfd)
- && handler->osabi == osabi)
+ if (handler->osabi != info.osabi)
+ continue;
+
+ /* If the architecture described by ARCH_INFO can run code for
+ the architcture we registered the handler for, then the
+ handler is applicable. Note, though, that if the handler is
+ for an architecture that is a superset of ARCH_INFO, we can't
+ use that --- it would be perfectly correct for it to install
+ gdbarch methods that refer to registers / instructions /
+ other facilities ARCH_INFO doesn't have.
+
+ NOTE: kettenis/20021027: There may be more than one machine
+ type that is compatible with the desired machine type. Right
+ now we simply return the first match, which is fine for now.
+ However, we might want to do something smarter in the future. */
+ /* NOTE: cagney/2003-10-23: The code for "a can_run_code_for b"
+ is implemented using BFD's compatible method (a->compatible
+ (b) == a -- the lowest common denominator between a and b is
+ a). That method's definition of compatible may not be as you
+ expect. For instance the test "amd64 can run code for i386"
+ (or more generally "64-bit ISA can run code for the 32-bit
+ ISA"). BFD doesn't normally consider 32-bit and 64-bit
+ "compatible" so it doesn't succeed. */
+ if (can_run_code_for (info.bfd_arch_info, handler->arch_info))
{
(*handler->init_osabi) (info, gdbarch);
return;
}
}
- /* We assume that if GDB_MULTI_ARCH is less than GDB_MULTI_ARCH_TM
- that an ABI variant can be supported by overriding definitions in
- the tm-file. */
- if (GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL)
- fprintf_filtered
- (gdb_stderr,
- "A handler for the OS ABI \"%s\" is not built into this "
- "configuration of GDB. "
- "Attempting to continue with the default %s settings",
- gdbarch_osabi_name (osabi),
- bfd_printable_arch_mach (arch_info->arch, arch_info->mach));
+ warning
+ ("A handler for the OS ABI \"%s\" is not built into this configuration\n"
+ "of GDB. Attempting to continue with the default %s settings.\n",
+ gdbarch_osabi_name (info.osabi),
+ info.bfd_arch_info->printable_name);
}
\f
+/* Limit on the amount of data to be read. */
+#define MAX_NOTESZ 128
+
+/* Return non-zero if NOTE matches NAME, DESCSZ and TYPE. */
+
+static int
+check_note (bfd *abfd, asection *sect, const char *note,
+ const char *name, unsigned long descsz, unsigned long type)
+{
+ unsigned long notesz;
+
+ /* Calculate the size of this note. */
+ notesz = strlen (name) + 1;
+ notesz = ((notesz + 3) & ~3);
+ notesz += descsz;
+ notesz = ((notesz + 3) & ~3);
+
+ /* If this assertion triggers, increase MAX_NOTESZ. */
+ gdb_assert (notesz <= MAX_NOTESZ);
+
+ /* Check whether SECT is big enough to comtain the complete note. */
+ if (notesz > bfd_section_size (abfd, sect))
+ return 0;
+
+ /* Check the note name. */
+ if (bfd_h_get_32 (abfd, note) != (strlen (name) + 1)
+ || strcmp (note + 12, name) != 0)
+ return 0;
+
+ /* Check the descriptor size. */
+ if (bfd_h_get_32 (abfd, note + 4) != descsz)
+ return 0;
+
+ /* Check the note type. */
+ if (bfd_h_get_32 (abfd, note + 8) != type)
+ return 0;
+
+ return 1;
+}
/* Generic sniffer for ELF flavoured files. */
void
generic_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
{
- enum gdb_osabi *os_ident_ptr = obj;
+ enum gdb_osabi *osabi = obj;
const char *name;
unsigned int sectsize;
+ char *note;
name = bfd_get_section_name (abfd, sect);
sectsize = bfd_section_size (abfd, sect);
- /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
- if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0)
- {
- unsigned int name_length, data_length, note_type;
- char *note;
-
- /* If the section is larger than this, it's probably not what we are
- looking for. */
- if (sectsize > 128)
- sectsize = 128;
-
- note = alloca (sectsize);
+ /* Limit the amount of data to read. */
+ if (sectsize > MAX_NOTESZ)
+ sectsize = MAX_NOTESZ;
- bfd_get_section_contents (abfd, sect, note,
- (file_ptr) 0, (bfd_size_type) sectsize);
+ note = alloca (sectsize);
+ bfd_get_section_contents (abfd, sect, note, 0, sectsize);
- name_length = bfd_h_get_32 (abfd, note);
- data_length = bfd_h_get_32 (abfd, note + 4);
- note_type = bfd_h_get_32 (abfd, note + 8);
-
- if (name_length == 4 && data_length == 16 && note_type == NT_GNU_ABI_TAG
- && strcmp (note + 12, "GNU") == 0)
+ /* .note.ABI-tag notes, used by GNU/Linux and FreeBSD. */
+ if (strcmp (name, ".note.ABI-tag") == 0)
+ {
+ /* GNU. */
+ if (check_note (abfd, sect, note, "GNU", 16, NT_GNU_ABI_TAG))
{
- int os_number = bfd_h_get_32 (abfd, note + 16);
+ unsigned int abi_tag = bfd_h_get_32 (abfd, note + 16);
- switch (os_number)
+ switch (abi_tag)
{
case GNU_ABI_TAG_LINUX:
- *os_ident_ptr = GDB_OSABI_LINUX;
+ *osabi = GDB_OSABI_LINUX;
break;
case GNU_ABI_TAG_HURD:
- *os_ident_ptr = GDB_OSABI_HURD;
+ *osabi = GDB_OSABI_HURD;
break;
case GNU_ABI_TAG_SOLARIS:
- *os_ident_ptr = GDB_OSABI_SOLARIS;
+ *osabi = GDB_OSABI_SOLARIS;
+ break;
+
+ case GNU_ABI_TAG_FREEBSD:
+ *osabi = GDB_OSABI_FREEBSD_ELF;
+ break;
+
+ case GNU_ABI_TAG_NETBSD:
+ *osabi = GDB_OSABI_NETBSD_ELF;
break;
default:
- internal_error
- (__FILE__, __LINE__,
- "generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
- os_number);
+ internal_error (__FILE__, __LINE__, "\
+generic_elf_osabi_sniff_abi_tag_sections: unknown OS number %d",
+ abi_tag);
}
return;
}
- else if (name_length == 8 && data_length == 4
- && note_type == NT_FREEBSD_ABI_TAG
- && strcmp (note + 12, "FreeBSD") == 0)
+
+ /* FreeBSD. */
+ if (check_note (abfd, sect, note, "FreeBSD", 4, NT_FREEBSD_ABI_TAG))
{
- /* XXX Should we check the version here? Probably not
- necessary yet. */
- *os_ident_ptr = GDB_OSABI_FREEBSD_ELF;
+ /* There is no need to check the version yet. */
+ *osabi = GDB_OSABI_FREEBSD_ELF;
+ return;
}
+
return;
}
-
+
/* .note.netbsd.ident notes, used by NetBSD. */
- if (strcmp (name, ".note.netbsd.ident") == 0 && sectsize > 0)
+ if (strcmp (name, ".note.netbsd.ident") == 0
+ && check_note (abfd, sect, note, "NetBSD", 4, NT_NETBSD_IDENT))
{
- unsigned int name_length, data_length, note_type;
- char *note;
-
- /* If the section is larger than this, it's probably not what we are
- looking for. */
- if (sectsize > 128)
- sectsize = 128;
-
- note = alloca (sectsize);
+ /* There is no need to check the version yet. */
+ *osabi = GDB_OSABI_NETBSD_ELF;
+ return;
+ }
- bfd_get_section_contents (abfd, sect, note,
- (file_ptr) 0, (bfd_size_type) sectsize);
-
- name_length = bfd_h_get_32 (abfd, note);
- data_length = bfd_h_get_32 (abfd, note + 4);
- note_type = bfd_h_get_32 (abfd, note + 8);
+ /* .note.openbsd.ident notes, used by OpenBSD. */
+ if (strcmp (name, ".note.openbsd.ident") == 0
+ && check_note (abfd, sect, note, "OpenBSD", 4, NT_OPENBSD_IDENT))
+ {
+ /* There is no need to check the version yet. */
+ *osabi = GDB_OSABI_OPENBSD_ELF;
+ return;
+ }
- if (name_length == 7 && data_length == 4 && note_type == NT_NETBSD_IDENT
- && strcmp (note + 12, "NetBSD") == 0)
- {
- /* XXX Should we check the version here? Probably not
- necessary yet. */
- *os_ident_ptr = GDB_OSABI_NETBSD_ELF;
- }
+ /* .note.netbsdcore.procinfo notes, used by NetBSD. */
+ if (strcmp (name, ".note.netbsdcore.procinfo") == 0)
+ {
+ *osabi = GDB_OSABI_NETBSD_ELF;
return;
}
}
switch (elfosabi)
{
case ELFOSABI_NONE:
- /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
- file are conforming to the base specification for that machine
- (there are no OS-specific extensions). In order to determine the
- real OS in use we must look for OS notes that have been added. */
+ /* When the EI_OSABI field in the ELF header is ELFOSABI_NONE
+ (0), then the ELF structures in the file are conforming to
+ the base specification for that machine (there are no
+ OS-specific extensions). In order to determine the real OS
+ in use we must look for OS-specific notes. */
bfd_map_over_sections (abfd,
generic_elf_osabi_sniff_abi_tag_sections,
&osabi);
case ELFOSABI_SOLARIS:
osabi = GDB_OSABI_SOLARIS;
break;
+
+ case ELFOSABI_HPUX:
+ /* For some reason the default value for the EI_OSABI field is
+ ELFOSABI_HPUX for all PA-RISC targets (with the exception of
+ GNU/Linux). We use HP-UX ELF as the default, but let any
+ OS-specific notes override this. */
+ osabi = GDB_OSABI_HPUX_ELF;
+ bfd_map_over_sections (abfd,
+ generic_elf_osabi_sniff_abi_tag_sections,
+ &osabi);
+ break;
}
if (osabi == GDB_OSABI_UNKNOWN)
return osabi;
}
\f
+static void
+set_osabi (char *args, int from_tty, struct cmd_list_element *c)
+{
+ struct gdbarch_info info;
+
+ if (strcmp (set_osabi_string, "auto") == 0)
+ user_osabi_state = osabi_auto;
+ else if (strcmp (set_osabi_string, "default") == 0)
+ {
+ user_selected_osabi = GDB_OSABI_DEFAULT;
+ user_osabi_state = osabi_user;
+ }
+ else if (strcmp (set_osabi_string, "none") == 0)
+ {
+ user_selected_osabi = GDB_OSABI_UNKNOWN;
+ user_osabi_state = osabi_user;
+ }
+ else
+ {
+ int i;
+ for (i = 1; i < GDB_OSABI_INVALID; i++)
+ if (strcmp (set_osabi_string, gdbarch_osabi_name (i)) == 0)
+ {
+ user_selected_osabi = i;
+ user_osabi_state = osabi_user;
+ break;
+ }
+ if (i == GDB_OSABI_INVALID)
+ internal_error (__FILE__, __LINE__,
+ "Invalid OS ABI \"%s\" passed to command handler.",
+ set_osabi_string);
+ }
+
+ /* NOTE: At some point (true multiple architectures) we'll need to be more
+ graceful here. */
+ gdbarch_info_init (&info);
+ if (! gdbarch_update_p (info))
+ internal_error (__FILE__, __LINE__, "Updating OS ABI failed.");
+}
+
+static void
+show_osabi (char *args, int from_tty)
+{
+ if (user_osabi_state == osabi_auto)
+ printf_filtered ("The current OS ABI is \"auto\" (currently \"%s\").\n",
+ gdbarch_osabi_name (gdbarch_osabi (current_gdbarch)));
+ else
+ printf_filtered ("The current OS ABI is \"%s\".\n",
+ gdbarch_osabi_name (user_selected_osabi));
+
+ if (GDB_OSABI_DEFAULT != GDB_OSABI_UNKNOWN)
+ printf_filtered ("The default OS ABI is \"%s\".\n",
+ gdbarch_osabi_name (GDB_OSABI_DEFAULT));
+}
+\f
+extern initialize_file_ftype _initialize_gdb_osabi; /* -Wmissing-prototype */
void
_initialize_gdb_osabi (void)
{
+ struct cmd_list_element *c;
+
if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID], "<invalid>") != 0)
internal_error
(__FILE__, __LINE__,
gdbarch_register_osabi_sniffer (bfd_arch_unknown,
bfd_target_elf_flavour,
generic_elf_osabi_sniffer);
+
+ /* Register the "set osabi" command. */
+ c = add_set_enum_cmd ("osabi", class_support, gdb_osabi_available_names,
+ &set_osabi_string, "Set OS ABI of target.", &setlist);
+
+ set_cmd_sfunc (c, set_osabi);
+ add_cmd ("osabi", class_support, show_osabi, "Show OS/ABI of target.",
+ &showlist);
+ user_osabi_state = osabi_auto;
}
projects / binutils.git / blobdiff