libdl: Add support for trampolines

- Trampolines or fixups for veneers provide long jump support
  for instruciton sets that implement short relative address
  branches. The linker provides trampolines when creating a
  static image. This patch adds trampoline support to libdl
  and the ARM architecture.

- The dl09 test requires enough memory so modules are outside
  the relative branch instruction ranges for the architecture.

Updates #3685

1 files changed, 39 insertions, 0 deletions

diff --git a/testsuites/libtests/dl09/dl-o2.c b/testsuites/libtests/dl09/dl-o2.c
new file mode 100644
index 0000000000..907fe9a268
--- /dev/null
+++ b/testsuites/libtests/dl09/dl-o2.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2014 Chris Johns <chrisj@rtems.org>.  All rights reserved.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include "dl-load.h"
+#include "dl-o2.h"
+#include "dl-o3.h"
+
+#include <rtems/test.h>
+
+#define printf(...) rtems_printf(&rtems_test_printer, __VA_ARGS__);
+
+int   dl02_bss1;
+float dl02_bss2[7];
+char  dl02_bss3[21];
+int   dl02_data1;
+float dl02_data2;
+
+#define DL_NAME       "dlo2"
+#define PAINT_VAR(_v) sizeof(_v), &_v, _v
+
+int rtems_main_o2 (void)
+{
+  printf (DL_NAME ": module: %s\n", dl_localise_file (__FILE__));
+  printf (DL_NAME ":         dl02_bss1: %4u: %p: %d\n",   PAINT_VAR (dl02_bss1));
+  printf (DL_NAME ":         dl02_bss2: %4u: %p: %f\n",   PAINT_VAR (dl02_bss2[0]));
+  printf (DL_NAME ":         dl02_bss3: %4u: %p: %02x\n", PAINT_VAR (dl02_bss3[0]));
+  printf (DL_NAME ":        dl02_data1: %4u: %p: %d\n",   PAINT_VAR (dl02_data1));
+  /* no %f in the rtems test printer */
+  printf (DL_NAME ":        dl02_data2: %4u: %p: %f\n",   PAINT_VAR (dl02_data2));
+
+  rtems_main_o3 ();
+
+  return 0;
+}