/* Target-dependent code for FreeBSD, architecture-independent.
- Copyright (C) 2002-2016 Free Software Foundation, Inc.
+ Copyright (C) 2002-2017 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "auxv.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "regset.h"
#include "gdbthread.h"
+#include "xml-syscall.h"
#include "elf-bfd.h"
#include "fbsd-tdep.h"
+/* FreeBSD kernels 12.0 and later include a copy of the
+ 'ptrace_lwpinfo' structure returned by the PT_LWPINFO ptrace
+ operation in an ELF core note (NT_FREEBSD_PTLWPINFO) for each LWP.
+ The constants below define the offset of field members and flags in
+ this structure used by methods in this file. Note that the
+ 'ptrace_lwpinfo' struct in the note is preceded by a 4 byte integer
+ containing the size of the structure. */
+
+#define LWPINFO_OFFSET 0x4
+
+/* Offsets in ptrace_lwpinfo. */
+#define LWPINFO_PL_FLAGS 0x8
+#define LWPINFO64_PL_SIGINFO 0x30
+#define LWPINFO32_PL_SIGINFO 0x2c
+
+/* Flags in pl_flags. */
+#define PL_FLAG_SI 0x20 /* siginfo is valid */
+
+/* Sizes of siginfo_t. */
+#define SIZE64_SIGINFO_T 80
+#define SIZE32_SIGINFO_T 64
+
+static struct gdbarch_data *fbsd_gdbarch_data_handle;
+
+struct fbsd_gdbarch_data
+ {
+ struct type *siginfo_type;
+ };
+
+static void *
+init_fbsd_gdbarch_data (struct gdbarch *gdbarch)
+{
+ return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct fbsd_gdbarch_data);
+}
+
+static struct fbsd_gdbarch_data *
+get_fbsd_gdbarch_data (struct gdbarch *gdbarch)
+{
+ return ((struct fbsd_gdbarch_data *)
+ gdbarch_data (gdbarch, fbsd_gdbarch_data_handle));
+}
+
/* This is how we want PTIDs from core files to be printed. */
-static char *
+static const char *
fbsd_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
{
static char buf[80];
static char buf[80];
struct bfd_section *section;
bfd_size_type size;
- char sectionstr[32];
if (ptid_get_lwp (thr->ptid) != 0)
{
structure. Rather than define the full structure here, just
extract the null-terminated name from the start of the
note. */
- xsnprintf (sectionstr, sizeof sectionstr, ".thrmisc/%ld",
- ptid_get_lwp (thr->ptid));
- section = bfd_get_section_by_name (core_bfd, sectionstr);
+ thread_section_name section_name (".thrmisc", thr->ptid);
+
+ section = bfd_get_section_by_name (core_bfd, section_name.c_str ());
if (section != NULL && bfd_section_size (core_bfd, section) > 0)
{
/* Truncate the name if it is longer than "buf". */
return NULL;
}
+/* Implement the "core_xfer_siginfo" gdbarch method. */
+
+static LONGEST
+fbsd_core_xfer_siginfo (struct gdbarch *gdbarch, gdb_byte *readbuf,
+ ULONGEST offset, ULONGEST len)
+{
+ size_t siginfo_size;
+
+ if (gdbarch_long_bit (gdbarch) == 32)
+ siginfo_size = SIZE32_SIGINFO_T;
+ else
+ siginfo_size = SIZE64_SIGINFO_T;
+ if (offset > siginfo_size)
+ return -1;
+
+ thread_section_name section_name (".note.freebsdcore.lwpinfo", inferior_ptid);
+ asection *section = bfd_get_section_by_name (core_bfd, section_name.c_str ());
+ if (section == NULL)
+ return -1;
+
+ gdb_byte buf[4];
+ if (!bfd_get_section_contents (core_bfd, section, buf,
+ LWPINFO_OFFSET + LWPINFO_PL_FLAGS, 4))
+ return -1;
+
+ int pl_flags = extract_signed_integer (buf, 4, gdbarch_byte_order (gdbarch));
+ if (!(pl_flags & PL_FLAG_SI))
+ return -1;
+
+ if (offset + len > siginfo_size)
+ len = siginfo_size - offset;
+
+ ULONGEST siginfo_offset;
+ if (gdbarch_long_bit (gdbarch) == 32)
+ siginfo_offset = LWPINFO_OFFSET + LWPINFO32_PL_SIGINFO;
+ else
+ siginfo_offset = LWPINFO_OFFSET + LWPINFO64_PL_SIGINFO;
+
+ if (!bfd_get_section_contents (core_bfd, section, readbuf,
+ siginfo_offset + offset, len))
+ return -1;
+
+ return len;
+}
+
static int
find_signalled_thread (struct thread_info *info, void *data)
{
return 0;
}
-static enum gdb_signal
-find_stop_signal (void)
-{
- struct thread_info *info =
- iterate_over_threads (find_signalled_thread, NULL);
-
- if (info)
- return info->suspend.stop_signal;
- else
- return GDB_SIGNAL_0;
-}
+/* Structure for passing information from
+ fbsd_collect_thread_registers via an iterator to
+ fbsd_collect_regset_section_cb. */
struct fbsd_collect_regset_section_cb_data
{
bfd *obfd;
char *note_data;
int *note_size;
+ unsigned long lwp;
+ enum gdb_signal stop_signal;
+ int abort_iteration;
};
static void
struct fbsd_collect_regset_section_cb_data *data
= (struct fbsd_collect_regset_section_cb_data *) cb_data;
+ if (data->abort_iteration)
+ return;
+
gdb_assert (regset->collect_regset);
buf = (char *) xmalloc (size);
/* PRSTATUS still needs to be treated specially. */
if (strcmp (sect_name, ".reg") == 0)
data->note_data = (char *) elfcore_write_prstatus
- (data->obfd, data->note_data, data->note_size,
- ptid_get_pid (inferior_ptid), find_stop_signal (), buf);
+ (data->obfd, data->note_data, data->note_size, data->lwp,
+ gdb_signal_to_host (data->stop_signal), buf);
else
data->note_data = (char *) elfcore_write_register_note
(data->obfd, data->note_data, data->note_size,
sect_name, buf, size);
xfree (buf);
+
+ if (data->note_data == NULL)
+ data->abort_iteration = 1;
+}
+
+/* Records the thread's register state for the corefile note
+ section. */
+
+static char *
+fbsd_collect_thread_registers (const struct regcache *regcache,
+ ptid_t ptid, bfd *obfd,
+ char *note_data, int *note_size,
+ enum gdb_signal stop_signal)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct fbsd_collect_regset_section_cb_data data;
+
+ data.regcache = regcache;
+ data.obfd = obfd;
+ data.note_data = note_data;
+ data.note_size = note_size;
+ data.stop_signal = stop_signal;
+ data.abort_iteration = 0;
+ data.lwp = ptid_get_lwp (ptid);
+
+ gdbarch_iterate_over_regset_sections (gdbarch,
+ fbsd_collect_regset_section_cb,
+ &data, regcache);
+ return data.note_data;
+}
+
+struct fbsd_corefile_thread_data
+{
+ struct gdbarch *gdbarch;
+ bfd *obfd;
+ char *note_data;
+ int *note_size;
+ enum gdb_signal stop_signal;
+};
+
+/* Records the thread's register state for the corefile note
+ section. */
+
+static void
+fbsd_corefile_thread (struct thread_info *info,
+ struct fbsd_corefile_thread_data *args)
+{
+ struct regcache *regcache;
+
+ regcache = get_thread_arch_regcache (info->ptid, args->gdbarch);
+
+ target_fetch_registers (regcache, -1);
+
+ args->note_data = fbsd_collect_thread_registers
+ (regcache, info->ptid, args->obfd, args->note_data,
+ args->note_size, args->stop_signal);
}
/* Create appropriate note sections for a corefile, returning them in
static char *
fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
{
- struct regcache *regcache = get_current_regcache ();
- char *note_data;
+ struct fbsd_corefile_thread_data thread_args;
+ char *note_data = NULL;
Elf_Internal_Ehdr *i_ehdrp;
- struct fbsd_collect_regset_section_cb_data data;
+ struct thread_info *curr_thr, *signalled_thr, *thr;
/* Put a "FreeBSD" label in the ELF header. */
i_ehdrp = elf_elfheader (obfd);
gdb_assert (gdbarch_iterate_over_regset_sections_p (gdbarch));
- data.regcache = regcache;
- data.obfd = obfd;
- data.note_data = NULL;
- data.note_size = note_size;
- target_fetch_registers (regcache, -1);
- gdbarch_iterate_over_regset_sections (gdbarch,
- fbsd_collect_regset_section_cb,
- &data, regcache);
- note_data = data.note_data;
-
if (get_exec_file (0))
{
const char *fname = lbasename (get_exec_file (0));
fname, psargs);
}
+ /* Thread register information. */
+ TRY
+ {
+ update_thread_list ();
+ }
+ CATCH (e, RETURN_MASK_ERROR)
+ {
+ exception_print (gdb_stderr, e);
+ }
+ END_CATCH
+
+ /* Like the kernel, prefer dumping the signalled thread first.
+ "First thread" is what tools use to infer the signalled thread.
+ In case there's more than one signalled thread, prefer the
+ current thread, if it is signalled. */
+ curr_thr = inferior_thread ();
+ if (curr_thr->suspend.stop_signal != GDB_SIGNAL_0)
+ signalled_thr = curr_thr;
+ else
+ {
+ signalled_thr = iterate_over_threads (find_signalled_thread, NULL);
+ if (signalled_thr == NULL)
+ signalled_thr = curr_thr;
+ }
+
+ thread_args.gdbarch = gdbarch;
+ thread_args.obfd = obfd;
+ thread_args.note_data = note_data;
+ thread_args.note_size = note_size;
+ thread_args.stop_signal = signalled_thr->suspend.stop_signal;
+
+ fbsd_corefile_thread (signalled_thr, &thread_args);
+ ALL_NON_EXITED_THREADS (thr)
+ {
+ if (thr == signalled_thr)
+ continue;
+ if (ptid_get_pid (thr->ptid) != ptid_get_pid (inferior_ptid))
+ continue;
+
+ fbsd_corefile_thread (thr, &thread_args);
+ }
+
+ note_data = thread_args.note_data;
+
return note_data;
}
-/* To be called from GDB_OSABI_FREEBSD_ELF handlers. */
+/* Print descriptions of FreeBSD-specific AUXV entries to FILE. */
+
+static void
+fbsd_print_auxv_entry (struct gdbarch *gdbarch, struct ui_file *file,
+ CORE_ADDR type, CORE_ADDR val)
+{
+ const char *name;
+ const char *description;
+ enum auxv_format format;
+
+ switch (type)
+ {
+#define _TAGNAME(tag) #tag
+#define TAGNAME(tag) _TAGNAME(AT_##tag)
+#define TAG(tag, text, kind) \
+ case AT_FREEBSD_##tag: name = TAGNAME(tag); description = text; format = kind; break
+ TAG (EXECPATH, _("Executable path"), AUXV_FORMAT_STR);
+ TAG (CANARY, _("Canary for SSP"), AUXV_FORMAT_HEX);
+ TAG (CANARYLEN, ("Length of the SSP canary"), AUXV_FORMAT_DEC);
+ TAG (OSRELDATE, _("OSRELDATE"), AUXV_FORMAT_DEC);
+ TAG (NCPUS, _("Number of CPUs"), AUXV_FORMAT_DEC);
+ TAG (PAGESIZES, _("Pagesizes"), AUXV_FORMAT_HEX);
+ TAG (PAGESIZESLEN, _("Number of pagesizes"), AUXV_FORMAT_DEC);
+ TAG (TIMEKEEP, _("Pointer to timehands"), AUXV_FORMAT_HEX);
+ TAG (STACKPROT, _("Initial stack protection"), AUXV_FORMAT_HEX);
+ TAG (EHDRFLAGS, _("ELF header e_flags"), AUXV_FORMAT_HEX);
+ TAG (HWCAP, _("Machine-dependent CPU capability hints"), AUXV_FORMAT_HEX);
+ default:
+ default_print_auxv_entry (gdbarch, file, type, val);
+ return;
+ }
+
+ fprint_auxv_entry (file, name, description, format, type, val);
+}
+
+/* Implement the "get_siginfo_type" gdbarch method. */
+
+static struct type *
+fbsd_get_siginfo_type (struct gdbarch *gdbarch)
+{
+ struct fbsd_gdbarch_data *fbsd_gdbarch_data;
+ struct type *int_type, *int32_type, *uint32_type, *long_type, *void_ptr_type;
+ struct type *uid_type, *pid_type;
+ struct type *sigval_type, *reason_type;
+ struct type *siginfo_type;
+ struct type *type;
+
+ fbsd_gdbarch_data = get_fbsd_gdbarch_data (gdbarch);
+ if (fbsd_gdbarch_data->siginfo_type != NULL)
+ return fbsd_gdbarch_data->siginfo_type;
+
+ int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
+ 0, "int");
+ int32_type = arch_integer_type (gdbarch, 32, 0, "int32_t");
+ uint32_type = arch_integer_type (gdbarch, 32, 1, "uint32_t");
+ long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch),
+ 0, "long");
+ void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
+
+ /* union sigval */
+ sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
+ TYPE_NAME (sigval_type) = xstrdup ("sigval");
+ append_composite_type_field (sigval_type, "sival_int", int_type);
+ append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type);
+
+ /* __pid_t */
+ pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF,
+ TYPE_LENGTH (int32_type) * TARGET_CHAR_BIT, "__pid_t");
+ TYPE_TARGET_TYPE (pid_type) = int32_type;
+ TYPE_TARGET_STUB (pid_type) = 1;
+
+ /* __uid_t */
+ uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF,
+ TYPE_LENGTH (uint32_type) * TARGET_CHAR_BIT,
+ "__uid_t");
+ TYPE_TARGET_TYPE (uid_type) = uint32_type;
+ TYPE_TARGET_STUB (uid_type) = 1;
+
+ /* _reason */
+ reason_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
+
+ /* _fault */
+ type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ append_composite_type_field (type, "si_trapno", int_type);
+ append_composite_type_field (reason_type, "_fault", type);
+
+ /* _timer */
+ type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ append_composite_type_field (type, "si_timerid", int_type);
+ append_composite_type_field (type, "si_overrun", int_type);
+ append_composite_type_field (reason_type, "_timer", type);
+
+ /* _mesgq */
+ type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ append_composite_type_field (type, "si_mqd", int_type);
+ append_composite_type_field (reason_type, "_mesgq", type);
+
+ /* _poll */
+ type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ append_composite_type_field (type, "si_band", long_type);
+ append_composite_type_field (reason_type, "_poll", type);
+
+ /* __spare__ */
+ type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ append_composite_type_field (type, "__spare1__", long_type);
+ append_composite_type_field (type, "__spare2__",
+ init_vector_type (int_type, 7));
+ append_composite_type_field (reason_type, "__spare__", type);
+
+ /* struct siginfo */
+ siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
+ TYPE_NAME (siginfo_type) = xstrdup ("siginfo");
+ append_composite_type_field (siginfo_type, "si_signo", int_type);
+ append_composite_type_field (siginfo_type, "si_errno", int_type);
+ append_composite_type_field (siginfo_type, "si_code", int_type);
+ append_composite_type_field (siginfo_type, "si_pid", pid_type);
+ append_composite_type_field (siginfo_type, "si_uid", uid_type);
+ append_composite_type_field (siginfo_type, "si_status", int_type);
+ append_composite_type_field (siginfo_type, "si_addr", void_ptr_type);
+ append_composite_type_field (siginfo_type, "si_value", sigval_type);
+ append_composite_type_field (siginfo_type, "_reason", reason_type);
+
+ fbsd_gdbarch_data->siginfo_type = siginfo_type;
+
+ return siginfo_type;
+}
+
+/* Implement the "get_syscall_number" gdbarch method. */
+
+static LONGEST
+fbsd_get_syscall_number (struct gdbarch *gdbarch,
+ ptid_t ptid)
+{
+
+ /* FreeBSD doesn't use gdbarch_get_syscall_number since FreeBSD
+ native targets fetch the system call number from the
+ 'pl_syscall_code' member of struct ptrace_lwpinfo in fbsd_wait.
+ However, system call catching requires this function to be
+ set. */
+
+ internal_error (__FILE__, __LINE__, _("fbsd_get_sycall_number called"));
+}
+
+/* To be called from GDB_OSABI_FREEBSD handlers. */
void
fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
set_gdbarch_core_pid_to_str (gdbarch, fbsd_core_pid_to_str);
set_gdbarch_core_thread_name (gdbarch, fbsd_core_thread_name);
+ set_gdbarch_core_xfer_siginfo (gdbarch, fbsd_core_xfer_siginfo);
set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes);
+ set_gdbarch_print_auxv_entry (gdbarch, fbsd_print_auxv_entry);
+ set_gdbarch_get_siginfo_type (gdbarch, fbsd_get_siginfo_type);
+
+ /* `catch syscall' */
+ set_xml_syscall_file_name (gdbarch, "syscalls/freebsd.xml");
+ set_gdbarch_get_syscall_number (gdbarch, fbsd_get_syscall_number);
+}
+
+void
+_initialize_fbsd_tdep (void)
+{
+ fbsd_gdbarch_data_handle =
+ gdbarch_data_register_post_init (init_fbsd_gdbarch_data);
}
projects / deliverable / binutils-gdb.git / blobdiff