Import the current project to git.

1 files changed, 153 insertions, 0 deletions

diff --git a/rtl-mdreloc-arm.c b/rtl-mdreloc-arm.c
new file mode 100644
index 0000000..8b210a2
--- /dev/null
+++ b/rtl-mdreloc-arm.c
@@ -0,0 +1,153 @@
+/*
+ * Taken from NetBSD and stripped of the relocations not needed on RTEMS.
+ *
+ *  $Id$
+ */
+
+/*  $NetBSD: mdreloc.c,v 1.33 2010/01/14 12:12:07 skrll Exp $  */
+
+#include <sys/cdefs.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <rtl.h>
+#include "rtl-elf.h"
+#include "rtl-error.h"
+#include <rtl-trace.h>
+
+/*
+ * It is possible for the compiler to emit relocations for unaligned data.
+ * We handle this situation with these inlines.
+ */
+#define  RELOC_ALIGNED_P(x) \
+  (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
+
+static inline Elf_Addr
+load_ptr (void *where)
+{
+  Elf_Addr res;
+  memcpy (&res, where, sizeof(res));
+  return (res);
+}
+
+static inline void
+store_ptr (void *where, Elf_Addr val)
+{
+  memcpy(where, &val, sizeof(val));
+}
+
+bool
+rtems_rtl_elf_relocate_rela (rtems_rtl_obj_t*      obj,
+                             const Elf_Rela*       rela,
+                             rtems_rtl_obj_sect_t* sect,
+                             const Elf_Sym*        sym,
+                             const char*           symname)
+{
+  printf ("rtl: rela record not supported; please report\n");
+  return false;
+}
+
+bool
+rtems_rtl_elf_relocate_rel (rtems_rtl_obj_t*      obj,
+                            const Elf_Rel*        rel,
+                            rtems_rtl_obj_sect_t* sect,
+                            const Elf_Sym*        sym,
+                            const char*           symname)
+{
+  Elf_Addr  target = 0;
+  Elf_Addr* where;
+  Elf_Addr  tmp;
+  Elf_Word  symvalue;
+
+  where = (Elf_Addr *)(sect->base + rel->r_offset);
+
+  switch (ELF_R_TYPE(rel->r_info)) {
+    case R_TYPE(NONE):
+      break;
+
+    case R_TYPE(PC24): {  /* word32 S - P + A */
+      Elf32_Sword addend;
+
+      /*
+       * Extract addend and sign-extend if needed.
+       */
+      addend = *where;
+      if (addend & 0x00800000)
+        addend |= 0xff000000;
+
+      if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
+        return false;
+
+      tmp = (Elf_Addr) symvalue - (Elf_Addr) where + (addend << 2);
+      if ((tmp & 0xfe000000) != 0xfe000000 &&
+          (tmp & 0xfe000000) != 0) {
+        rtems_rtl_set_error ("%s: R_ARM_PC24 relocation @ %p to %s failed "
+                             "(displacement %ld (%#lx) out of range)",
+                             obj->oname, where, symname,
+                             (long) tmp, (long) tmp);
+        return false;
+      }
+      tmp >>= 2;
+      *where = (*where & 0xff000000) | (tmp & 0x00ffffff);
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc PC24 %s in %s --> %p @ %p\n",
+                symname, obj->oname, (void *)*where, where);
+      break;
+    }
+
+    case R_TYPE(ABS32):     /* word32 B + S + A */
+    case R_TYPE(GLOB_DAT):  /* word32 B + S */
+      if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
+        return false;
+
+      if (__predict_true (RELOC_ALIGNED_P (where))) {
+        tmp = *where + symvalue;
+        /* Set the Thumb bit, if needed.  */
+        if (ELF_ST_TYPE(def->st_info) == STT_ARM_TFUNC)
+          tmp |= 1;
+        *where = tmp;
+      } else {
+        tmp = load_ptr (where) + symvalue;
+        /* Set the Thumb bit, if needed.  */
+        if (ELF_ST_TYPE(def->st_info) == STT_ARM_TFUNC)
+          tmp |= 1;
+        store_ptr (where, tmp);
+      }
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc ABS32/GLOB_DAT %s in %s --> %p @ %p\n",
+                symname, obj->oname, (void *)tmp, where);
+      break;
+
+    case R_TYPE(RELATIVE):  /* word32 B + A */
+      if (__predict_true (RELOC_ALIGNED_P (where))) {
+        tmp = *where + (Elf_Addr) sect->base;
+        *where = tmp;
+      } else {
+        tmp = load_ptr (where) + (Elf_Addr) sect->base;
+        store_ptr (where, tmp);
+      }
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: reloc RELATIVE in %s --> %p", obj->oname, (void *)tmp));
+      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, symbol = %s\n",
+              ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
+              (void *)rel->r_offset, (void *)*where, symname);
+      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;
+}