xtensa: implement NPTL helpers

These changes allow debugging multithreaded NPTL xtensa applications.

2015-08-20  Max Filippov  <jcmvbkbc@gmail.com>
gdb/gdbserver/
	* configure.srv (xtensa*-*-linux*): Add srv_linux_thread_db=yes.
	* linux-xtensa-low.c (arch/xtensa.h gdb_proc_service.h): New
	#includes.
	(ps_get_thread_area): New function.

2015-08-20  Max Filippov  <jcmvbkbc@gmail.com>
gdb/
	* arch/xtensa.h: New file.
	* xtensa-linux-nat.c (gdb_proc_service.h): New #include.
	(ps_get_thread_area): New function.
	* xtensa-linux-tdep.c (xtensa_linux_init_abi): Add call to
	set_gdbarch_fetch_tls_load_module_address to enable TLS support.
	* xtensa-tdep.c (osabi.h): New #include.
	(xtensa_gdbarch_init): Call gdbarch_init_osabi to register
	xtensa-specific hooks.
	* xtensa-tdep.h (struct xtensa_elf_gregset_t): Add threadptr
	member and move the structure to arch/xtensa.h.

1 files changed, 46 insertions, 0 deletions

diff --git a/gdb/arch/xtensa.h b/gdb/arch/xtensa.h
new file mode 100644
index 0000000..6a78c96
--- /dev/null
+++ b/gdb/arch/xtensa.h
@@ -0,0 +1,46 @@
+/* Common Target-dependent code for the Xtensa port of GDB, the GNU debugger.
+
+   Copyright (C) 2003-2015 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef XTENSA_H
+#define XTENSA_H
+
+/* Xtensa ELF core file register set representation ('.reg' section).
+   Copied from target-side ELF header <xtensa/elf.h>.  */
+
+typedef uint32_t xtensa_elf_greg_t;
+
+typedef struct
+{
+  xtensa_elf_greg_t pc;
+  xtensa_elf_greg_t ps;
+  xtensa_elf_greg_t lbeg;
+  xtensa_elf_greg_t lend;
+  xtensa_elf_greg_t lcount;
+  xtensa_elf_greg_t sar;
+  xtensa_elf_greg_t windowstart;
+  xtensa_elf_greg_t windowbase;
+  xtensa_elf_greg_t threadptr;
+  xtensa_elf_greg_t reserved[7+48];
+  xtensa_elf_greg_t ar[64];
+} xtensa_elf_gregset_t;
+
+#define XTENSA_ELF_NGREG (sizeof (xtensa_elf_gregset_t) \
+			  / sizeof (xtensa_elf_greg_t))
+
+#endif