gdbserver: xtensa: support THREADPTR register

[deliverable/binutils-gdb.git] / gdb / linux-tdep.c

diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index ab110b0a6872b8e479430ada961dd252e444f801..1a3e48d83d937b393efc98c821030272ec4b269d 100644 (file)
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for GNU/Linux, architecture independent.
 
-   Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   Copyright (C) 2009-2017 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -2287,17 +2287,42 @@ linux_vsyscall_range_raw (struct gdbarch *gdbarch, struct mem_range *range)
   long pid;
   char *data;
 
-  /* Can't access /proc if debugging a core file.  */
-  if (!target_has_execution)
+  if (target_auxv_search (&current_target, AT_SYSINFO_EHDR, &range->start) <= 0)
     return 0;
 
+  /* It doesn't make sense to access the host's /proc when debugging a
+     core file.  Instead, look for the PT_LOAD segment that matches
+     the vDSO.  */
+  if (!target_has_execution)
+    {
+      Elf_Internal_Phdr *phdrs;
+      long phdrs_size;
+      int num_phdrs, i;
+
+      phdrs_size = bfd_get_elf_phdr_upper_bound (core_bfd);
+      if (phdrs_size == -1)
+       return 0;
+
+      phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size);
+      num_phdrs = bfd_get_elf_phdrs (core_bfd, phdrs);
+      if (num_phdrs == -1)
+       return 0;
+
+      for (i = 0; i < num_phdrs; i++)
+       if (phdrs[i].p_type == PT_LOAD
+           && phdrs[i].p_vaddr == range->start)
+         {
+           range->length = phdrs[i].p_memsz;
+           return 1;
+         }
+
+      return 0;
+    }
+
   /* We need to know the real target PID to access /proc.  */
   if (current_inferior ()->fake_pid_p)
     return 0;
 
-  if (target_auxv_search (&current_target, AT_SYSINFO_EHDR, &range->start) <= 0)
-    return 0;
-
   pid = current_inferior ()->pid;
 
   /* Note that reading /proc/PID/task/PID/maps (1) is much faster than