From ae5fe7e6bca2874c5f1ef077204bb63124fb3db3 Mon Sep 17 00:00:00 2001
From: Chris Johns <chrisj@rtems.org>
Date: Sun, 26 Oct 2014 18:09:41 -0700
Subject: cpukit: Add libdl with the Runtime Loader (RTL) code.

This is a merge of the RTL project.
---
 cpukit/libdl/rtl-mdreloc-i386.c | 103 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 cpukit/libdl/rtl-mdreloc-i386.c

(limited to 'cpukit/libdl/rtl-mdreloc-i386.c')

diff --git a/cpukit/libdl/rtl-mdreloc-i386.c b/cpukit/libdl/rtl-mdreloc-i386.c
new file mode 100644
index 0000000000..b6dd9b7306
--- /dev/null
+++ b/cpukit/libdl/rtl-mdreloc-i386.c
@@ -0,0 +1,103 @@
+/*
+ * Taken from NetBSD and stripped of the relocations not needed on RTEMS.
+ */
+
+/*  $NetBSD: mdreloc.c,v 1.31 2010/01/14 11:58:32 skrll Exp $  */
+
+#include <sys/cdefs.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <rtems/rtl/rtl.h>
+#include "rtl-elf.h"
+#include "rtl-error.h"
+#include "rtl-trace.h"
+
+bool
+rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
+{
+  return true;
+}
+
+bool
+rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t*      obj,
+                             const Elf_Rela*             rel,
+                             const rtems_rtl_obj_sect_t* sect,
+                             const char*                 symname,
+                             const Elf_Byte              syminfo,
+                             const Elf_Word              symvalue)
+{
+  rtems_rtl_set_error (EINVAL, "rela type record not supported");
+  return false;
+}
+
+bool
+rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t*      obj,
+                            const Elf_Rel*              rel,
+                            const rtems_rtl_obj_sect_t* sect,
+                            const char*                 symname,
+                            const Elf_Byte              syminfo,
+                            const Elf_Word              symvalue)
+{
+	Elf_Addr  target = 0;
+  Elf_Addr* where;
+  Elf_Addr  tmp;
+
+  where = (Elf_Addr *)(sect->base + rel->r_offset);
+
+  switch (ELF_R_TYPE(rel->r_info)) {
+    case R_TYPE(NONE):
+      break;
+
+    case R_TYPE(PC32):
+      target = (Elf_Addr) symvalue;
+      *where += target - (Elf_Addr)where;
+
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc PC32 in %s --> %p (%p @ %p) in %s\n",
+                sect->name, (void*) symvalue,
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
+      break;
+
+    case R_TYPE(GOT32):
+    case R_TYPE(32):
+    case R_TYPE(GLOB_DAT):
+      target = (Elf_Addr) symvalue;
+
+      tmp = target + *where;
+      if (*where != tmp)
+        *where = tmp;
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc 32/GLOB_DAT in %s --> %p @ %p in %s\n",
+                sect->name, (void *)*where, where,
+                rtems_rtl_obj_oname (obj));
+      break;
+
+    case R_TYPE(RELATIVE):
+      *where += (Elf_Addr)sect->base;
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc RELATIVE in %s --> %p @ %p\n",
+                rtems_rtl_obj_oname (obj), (void *)*where, where);
+      break;
+
+    case R_TYPE(COPY):
+      printf ("rtl: reloc COPY (please report)\n");
+      break;
+
+    default:
+      printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
+              "contents = %p\n",
+              ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
+              (void *)rel->r_offset, (void *)*where);
+      rtems_rtl_set_error (EINVAL,
+                           "%s: Unsupported relocation type %ld "
+                           "in non-PLT relocations",
+                           sect->name, (uint32_t) ELF_R_TYPE(rel->r_info));
+      return false;
+  }
+
+  return true;
+}
-- 
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