Document fact that mininum Python version is now 2.6

[deliverable/binutils-gdb.git] / gdb / solib-darwin.c

diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
index ed8e0c13365609b76383b5435985afcc0648d1c1..b976b79091a06984eb6c6139f007de028d04b510 100644 (file)
--- a/gdb/solib-darwin.c
+++ b/gdb/solib-darwin.c
@@ -1,6 +1,6 @@
 /* Handle Darwin shared libraries for GDB, the GNU Debugger.
 
-   Copyright (C) 2009-2018 Free Software Foundation, Inc.
+   Copyright (C) 2009-2019 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -429,23 +429,21 @@ gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format,
   return gdb_bfd_ref_ptr (result);
 }
 
-/* Extract dyld_all_image_addr when the process was just created, assuming the
-   current PC is at the entry of the dynamic linker.  */
+/* Return the BFD for the program interpreter.  */
 
-static void
-darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info)
+static gdb_bfd_ref_ptr
+darwin_get_dyld_bfd ()
 {
   char *interp_name;
-  CORE_ADDR load_addr = 0;
 
   /* This method doesn't work with an attached process.  */
   if (current_inferior ()->attach_flag)
-    return;
+    return NULL;
 
   /* Find the program interpreter.  */
   interp_name = find_program_interpreter ();
   if (!interp_name)
-    return;
+    return NULL;
 
   /* Create a bfd for the interpreter.  */
   gdb_bfd_ref_ptr dyld_bfd (gdb_bfd_open (interp_name, gnutarget, -1));
@@ -454,11 +452,20 @@ darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info)
       gdb_bfd_ref_ptr sub
        (gdb_bfd_mach_o_fat_extract (dyld_bfd.get (), bfd_object,
                                     gdbarch_bfd_arch_info (target_gdbarch ())));
-      if (sub != NULL)
-       dyld_bfd = sub;
-      else
-       dyld_bfd.release ();
+      dyld_bfd = sub;
     }
+  return dyld_bfd;
+}
+
+/* Extract dyld_all_image_addr when the process was just created, assuming the
+   current PC is at the entry of the dynamic linker.  */
+
+static void
+darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info)
+{
+  CORE_ADDR load_addr = 0;
+  gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd ();
+
   if (dyld_bfd == NULL)
     return;
 
@@ -528,10 +535,6 @@ darwin_solib_create_inferior_hook (int from_tty)
       return;
     }
 
-  /* Add the breakpoint which is hit by dyld when the list of solib is
-     modified.  */
-  create_solib_event_breakpoint (target_gdbarch (), info->all_image.notifier);
-
   if (info->all_image.count != 0)
     {
       /* Possible relocate the main executable (PIE).  */
@@ -558,6 +561,49 @@ darwin_solib_create_inferior_hook (int from_tty)
       if (vmaddr != load_addr)
        objfile_rebase (symfile_objfile, load_addr - vmaddr);
     }
+
+  /* Set solib notifier (to reload list of shared libraries).  */
+  CORE_ADDR notifier = info->all_image.notifier;
+
+  if (info->all_image.count == 0)
+    {
+      /* Dyld hasn't yet relocated itself, so the notifier address may
+        be incorrect (as it has to be relocated).  */
+      CORE_ADDR start = bfd_get_start_address (exec_bfd);
+      if (start == 0)
+       notifier = 0;
+      else
+        {
+          gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd ();
+          if (dyld_bfd != NULL)
+            {
+              CORE_ADDR dyld_bfd_start_address;
+              CORE_ADDR dyld_relocated_base_address;
+              CORE_ADDR pc;
+
+              dyld_bfd_start_address = bfd_get_start_address (dyld_bfd.get());
+
+              /* We find the dynamic linker's base address by examining
+                 the current pc (which should point at the entry point
+                 for the dynamic linker) and subtracting the offset of
+                 the entry point.  */
+
+              pc = regcache_read_pc (get_current_regcache ());
+              dyld_relocated_base_address = pc - dyld_bfd_start_address;
+
+              /* We get the proper notifier relocated address by
+                 adding the dyld relocated base address to the current
+                 notifier offset value.  */
+
+              notifier += dyld_relocated_base_address;
+            }
+        }
+    }
+
+  /* Add the breakpoint which is hit by dyld when the list of solib is
+     modified.  */
+  if (notifier != 0)
+    create_solib_event_breakpoint (target_gdbarch (), notifier);
 }
 
 static void