Enable elf_backend_rela_normal for AArch64

[deliverable/binutils-gdb.git] / gdb / main.c

diff --git a/gdb/main.c b/gdb/main.c
index 59015f5a9e1da85c5302c28dbfbe67e6bc73d2ee..0d4d5122f2e4ced9fe399ed4b70fe51b58536914 100644 (file)
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -45,6 +45,7 @@
 
 #include "filenames.h"
 #include "filestuff.h"
+#include <signal.h>
 
 /* The selected interpreter.  This will be used as a set command
    variable, so it should always be malloc'ed - since
@@ -106,6 +107,41 @@ get_gdb_program_name (void)
 
 static void print_gdb_help (struct ui_file *);
 
+/* Set the data-directory parameter to NEW_DATADIR.
+   If NEW_DATADIR is not a directory then a warning is printed.
+   We don't signal an error for backward compatibility.  */
+
+void
+set_gdb_data_directory (const char *new_datadir)
+{
+  struct stat st;
+
+  if (stat (new_datadir, &st) < 0)
+    {
+      int save_errno = errno;
+
+      fprintf_unfiltered (gdb_stderr, "Warning: ");
+      print_sys_errmsg (new_datadir, save_errno);
+    }
+  else if (!S_ISDIR (st.st_mode))
+    warning (_("%s is not a directory."), new_datadir);
+
+  xfree (gdb_datadir);
+  gdb_datadir = gdb_realpath (new_datadir);
+
+  /* gdb_realpath won't return an absolute path if the path doesn't exist,
+     but we still want to record an absolute path here.  If the user entered
+     "../foo" and "../foo" doesn't exist then we'll record $(pwd)/../foo which
+     isn't canonical, but that's ok.  */
+  if (!IS_ABSOLUTE_PATH (gdb_datadir))
+    {
+      char *abs_datadir = gdb_abspath (gdb_datadir);
+
+      xfree (gdb_datadir);
+      gdb_datadir = abs_datadir;
+    }
+}
+
 /* Relocate a file or directory.  PROGNAME is the name by which gdb
    was invoked (i.e., argv[0]).  INITIAL is the default value for the
    file or directory.  FLAG is true if the value is relocatable, false
@@ -253,6 +289,27 @@ get_init_files (const char **system_gdbinit,
   *local_gdbinit = localinit;
 }
 
+/* Try to set up an alternate signal stack for SIGSEGV handlers.
+   This allows us to handle SIGSEGV signals generated when the
+   normal process stack is exhausted.  If this stack is not set
+   up (sigaltstack is unavailable or fails) and a SIGSEGV is
+   generated when the normal stack is exhausted then the program
+   will behave as though no SIGSEGV handler was installed.  */
+
+static void
+setup_alternate_signal_stack (void)
+{
+#ifdef HAVE_SIGALTSTACK
+  stack_t ss;
+
+  ss.ss_sp = xmalloc (SIGSTKSZ);
+  ss.ss_size = SIGSTKSZ;
+  ss.ss_flags = 0;
+
+  sigaltstack(&ss, NULL);
+#endif
+}
+
 /* Call command_loop.  If it happens to return, pass that through as a
    non-zero return status.  */
 
@@ -517,6 +574,7 @@ captured_main (void *data)
       {"directory", required_argument, 0, 'd'},
       {"d", required_argument, 0, 'd'},
       {"data-directory", required_argument, 0, 'D'},
+      {"D", required_argument, 0, 'D'},
       {"cd", required_argument, 0, OPT_CD},
       {"tty", required_argument, 0, 't'},
       {"baud", required_argument, 0, 'b'},
@@ -641,8 +699,15 @@ captured_main (void *data)
            gdb_stdout = ui_file_new();
            break;
          case 'D':
-           xfree (gdb_datadir);
-           gdb_datadir = xstrdup (optarg);
+           if (optarg[0] == '\0')
+             {
+               fprintf_unfiltered (gdb_stderr,
+                                   _("%s: empty path for"
+                                     " `--data-directory'\n"),
+                                   argv[0]);
+               exit (1);
+             }
+           set_gdb_data_directory (optarg);
            gdb_datadir_provided = 1;
            break;
 #ifdef GDBTK
@@ -742,6 +807,9 @@ captured_main (void *data)
       quiet = 1;
   }
 
+  /* Try to set up an alternate signal stack for SIGSEGV handlers.  */
+  setup_alternate_signal_stack ();
+
   /* Initialize all files.  Give the interpreter a chance to take
      control of the console via the deprecated_init_ui_hook ().  */
   gdb_init (gdb_program_name);
@@ -1130,7 +1198,8 @@ Output and user interface control:\n\n\
   fputs_unfiltered (_("\
   --dbx              DBX compatibility mode.\n\
   --xdb              XDB compatibility mode.\n\
-  --quiet            Do not print version number on startup.\n\n\
+  -q, --quiet, --silent\n\
+                     Do not print version number on startup.\n\n\
 "), stream);
   fputs_unfiltered (_("\
 Operating modes:\n\n\
@@ -1146,6 +1215,8 @@ Remote debugging options:\n\n\
   -l TIMEOUT         Set timeout in seconds for remote debugging.\n\n\
 Other options:\n\n\
   --cd=DIR           Change current directory to DIR.\n\
+  --data-directory=DIR, -D\n\
+                     Set GDB's data-directory to DIR.\n\
 "), stream);
   fputs_unfiltered (_("\n\
 At startup, GDB reads the following init files and executes their commands:\n\