gdb: Update to 7.3.50.20110722.

[people/pmueller/ipfire-3.x.git] / gdb / patches / gdb-core-open-vdso-warning.patch

diff --git a/gdb/patches/gdb-core-open-vdso-warning.patch b/gdb/patches/gdb-core-open-vdso-warning.patch
new file mode 100644 (file)
index 0000000..87ccc0b
--- /dev/null
+++ b/gdb/patches/gdb-core-open-vdso-warning.patch
@@ -0,0 +1,85 @@
+http://sourceware.org/ml/gdb-patches/2009-10/msg00142.html
+Subject: [patch] Fix GNU/Linux core open: Can't read pathname for load map:  Input/output error.
+
+Hi,
+
+GDB currently always prints on loading a core file:
+       warning: Can't read pathname for load map: Input/output error.
+
+The patch is not nice but it was WONTFIXed on the glibc side in:
+       http://sourceware.org/ml/libc-alpha/2009-10/msg00001.html
+
+The same message in GDB PR 8882 and glibc PR 387 was for ld-linux.so.2 l_name
+but that one is now ignored thanks to IGNORE_FIRST_LINK_MAP_ENTRY.
+
+This fix is intended for Linux system vDSO l_name which is a second entry in
+the DSO list.
+
+Regression tested on {x86_86,x86_64-m32,i686}-fedora11-linux-gnu.
+
+
+Thanks,
+Jan
+
+
+gdb/
+2009-10-06  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+       Do not print false warning on reading core file with vDSO on GNU/Linux.
+       * solib-svr4.c (svr4_current_sos): Suppress the warning if
+       MASTER_SO_LIST is still NULL.
+       * solib.c (update_solib_list): New variable saved_so_list_head.
+       Conditionally restart the function.
+
+[ Context backport.  ]
+
+Index: gdb-7.3.50.20110722/gdb/solib-svr4.c
+===================================================================
+--- gdb-7.3.50.20110722.orig/gdb/solib-svr4.c  2011-07-22 19:26:46.000000000 +0200
++++ gdb-7.3.50.20110722/gdb/solib-svr4.c       2011-07-22 19:29:36.000000000 +0200
+@@ -1197,8 +1197,18 @@ svr4_current_sos (void)
+         target_read_string (lm_name (new), &buffer,
+                             SO_NAME_MAX_PATH_SIZE - 1, &errcode);
+         if (errcode != 0)
+-          warning (_("Can't read pathname for load map: %s."),
+-                   safe_strerror (errcode));
++          {
++            /* During the first ever DSO list reading some strings may be
++               unreadable as residing in the ld.so readonly memory not being
++               present in a dumped core file.  Delay the error check after
++               the first pass of DSO list scanning when ld.so should be
++               already mapped in and all the DSO list l_name memory gets
++               readable.  */
++
++            if (master_so_list () != NULL)
++              warning (_("Can't read pathname for load map: %s."),
++                       safe_strerror (errcode));
++          }
+         else
+           {
+             struct build_id *build_id;
+Index: gdb-7.3.50.20110722/gdb/solib.c
+===================================================================
+--- gdb-7.3.50.20110722.orig/gdb/solib.c       2011-06-30 21:29:54.000000000 +0200
++++ gdb-7.3.50.20110722/gdb/solib.c    2011-07-22 19:29:10.000000000 +0200
+@@ -706,6 +706,7 @@ update_solib_list (int from_tty, struct 
+   struct target_so_ops *ops = solib_ops (target_gdbarch);
+   struct so_list *inferior = ops->current_sos();
+   struct so_list *gdb, **gdb_link;
++  struct so_list *saved_so_list_head = so_list_head;
+ 
+   /* We can reach here due to changing solib-search-path or the
+      sysroot, before having any inferior.  */
+@@ -846,6 +847,12 @@ update_solib_list (int from_tty, struct 
+         observer_notify_solib_loaded (i);
+       }
+ 
++      /* If this was the very first DSO list scan and we possibly read in ld.so
++       recheck all the formerly unreadable DSO names strings.  */
++
++      if (saved_so_list_head == NULL && so_list_head != NULL)
++      return update_solib_list (from_tty, target);
++
+       /* If a library was not found, issue an appropriate warning
+        message.  We have to use a single call to warning in case the
+        front end does something special with warnings, e.g., pop up