Implement the "get_siginfo_type" gdbarch method for FreeBSD architectures.

As with Linux architectures, cache the created type in the gdbarch when it
is first created.  Currently FreeBSD uses an identical siginfo type on
all architectures, so there is no support for architecture-specific fields.

gdb/ChangeLog:

	* fbsd-tdep.c (fbsd_gdbarch_data_handle, struct fbsd_gdbarch_data)
	(init_fbsd_gdbarch_data, get_fbsd_gdbarch_data)
	(fbsd_get_siginfo_type): New.
	(fbsd_init_abi): Install gdbarch "get_siginfo_type" method.
	(_initialize_fbsd_tdep): New.

2 files changed, 130 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a474077899a..d5afeade3a3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2017-07-07  John Baldwin  <jhb@FreeBSD.org>
+
+	* fbsd-tdep.c (fbsd_gdbarch_data_handle, struct fbsd_gdbarch_data)
+	(init_fbsd_gdbarch_data, get_fbsd_gdbarch_data)
+	(fbsd_get_siginfo_type): New.
+	(fbsd_init_abi): Install gdbarch "get_siginfo_type" method.
+	(_initialize_fbsd_tdep): New.
+
 2017-07-06  David Blaikie  <dblaikie@gmail.com>
 
 	* dwarf2read.c (struct dwo_file): Use a htab of dwo_unit* (rather than
diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c
index b834ce38b45..24a3c20dd60 100644
--- a/gdb/fbsd-tdep.c
+++ b/gdb/fbsd-tdep.c
@@ -30,6 +30,26 @@
 #include "fbsd-tdep.h"
 
 
+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 const char *
@@ -314,6 +334,97 @@ fbsd_print_auxv_entry (struct gdbarch *gdbarch, struct ui_file *file,
   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), "__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), "__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
@@ -339,8 +450,19 @@ fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_core_thread_name (gdbarch, fbsd_core_thread_name);
   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);
 }
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_fbsd_tdep;
+
+void
+_initialize_fbsd_tdep (void)
+{
+  fbsd_gdbarch_data_handle =
+    gdbarch_data_register_post_init (init_fbsd_gdbarch_data);
+}