2013-01-17 Pedro Alves <palves@redhat.com>

[deliverable/binutils-gdb.git] / gdb / m68klinux-nat.c

diff --git a/gdb/m68klinux-nat.c b/gdb/m68klinux-nat.c
index c7137c0414b25bbd674270da623b0d8048653385..19fb7abd3dcf300f2593e8c4580327755bd2251f 100644 (file)
--- a/gdb/m68klinux-nat.c
+++ b/gdb/m68klinux-nat.c
@@ -1,6 +1,6 @@
 /* Motorola m68k native support for GNU/Linux.
 
-   Copyright (C) 1996, 1998, 2000-2012 Free Software Foundation, Inc.
+   Copyright (C) 1996-2013 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -51,6 +51,13 @@
 
 /* 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 25
+#endif
 \f
 /* This table must line up with gdbarch_register_name in "m68k-tdep.c".  */
 static const int regmap[] =
@@ -100,7 +107,7 @@ static void
 fetch_register (struct regcache *regcache, int regno)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  long regaddr;
+  long regaddr, val;
   int i;
   char buf[MAX_REGISTER_SIZE];
   int tid;
@@ -115,7 +122,8 @@ fetch_register (struct regcache *regcache, int regno)
   for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
     {
       errno = 0;
-      *(long *) &buf[i] = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
+      val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
+      memcpy (&buf[i], &val, sizeof (long));
       regaddr += sizeof (long);
       if (errno != 0)
        error (_("Couldn't read register %s (#%d): %s."), 
@@ -153,7 +161,7 @@ static void
 store_register (const struct regcache *regcache, int regno)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  long regaddr;
+  long regaddr, val;
   int i;
   int tid;
   char buf[MAX_REGISTER_SIZE];
@@ -173,7 +181,8 @@ store_register (const struct regcache *regcache, int regno)
   for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
     {
       errno = 0;
-      ptrace (PTRACE_POKEUSER, tid, regaddr, *(long *) &buf[i]);
+      memcpy (&val, &buf[i], sizeof (long));
+      ptrace (PTRACE_POKEUSER, tid, regaddr, val);
       regaddr += sizeof (long);
       if (errno != 0)
        error (_("Couldn't write register %s (#%d): %s."),
@@ -556,6 +565,24 @@ fetch_core_registers (struct regcache *regcache,
 }
 \f
 
+/* 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 = (char *) *base - idx;
+
+  return PS_OK;
+}
+\f
+
 /* Register that we are able to handle GNU/Linux ELF core file
    formats.  */