gdb/

	* Makefile.in (arm-linux-nat.o): Update dependencies.
	* arm-linux-nat.c: Include "gdb_proc_service.h".
	(PTRACE_GET_THREAD_AREA): Define.
	(ps_get_thread_area): New function.
gdb/gdbserver/
	* Makefile.in (linux-arm-low.o): Update dependencies.
	* linux-arm-low.c: Include "../gdb_proc_service.h".
	(PTRACE_GET_THREAD_AREA): Define.
	(ps_get_thread_area): New function.

1 files changed, 24 insertions, 0 deletions

diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index 8023026a209..0cfec203f5e 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -37,6 +37,13 @@
 /* Prototypes for supply_gregset etc. */
 #include "gregset.h"
 
+/* Defines ps_err_e, struct ps_prochandle.  */
+#include "gdb_proc_service.h"
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 22
+#endif
+
 extern int arm_apcs_32;
 
 #define		typeNone		0x00
@@ -694,6 +701,23 @@ arm_linux_kernel_u_size (void)
   return (sizeof (struct user));
 }
 
+/* Fetch the thread-local storage pointer for libthread_db.  */
+
+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+                    lwpid_t lwpid, int idx, void **base)
+{
+  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
+    return PS_ERR;
+
+  /* IDX is the bias from the thread pointer to the beginning of the
+     thread descriptor.  It has to be subtracted due to implementation
+     quirks in libthread_db.  */
+  *base = (void *) ((char *)*base - idx);
+
+  return PS_OK;
+}
+
 static unsigned int
 get_linux_version (unsigned int *vmajor,
 		   unsigned int *vminor,