microblaze mmu/elf/shared lib support

microblaze can either be with mmu or without
If with, use elf rather than flat, and support shared libs

Signed-off-by: Ryan Flux <ryan.flux@emsolutions.com.au>
Signed-off-by: Steve Bennett <steveb@workware.net.au>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/ldso/ldso/microblaze/dl-sysdep.h b/ldso/ldso/microblaze/dl-sysdep.h
new file mode 100644
index 000000000..1f89673a0
--- /dev/null
+++ b/ldso/ldso/microblaze/dl-sysdep.h
@@ -0,0 +1,85 @@
+/* elf reloc code for the microblaze platform, based on glibc 2.3.6, dl-machine.h */
+
+/*
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* Use reloca */
+#define ELF_USES_RELOCA
+
+#include <elf.h>
+
+
+/* Initialise the GOT */
+#define INIT_GOT(GOT_BASE,MODULE)							\
+do {														\
+	GOT_BASE[2] = (unsigned long) _dl_linux_resolve;		\
+	GOT_BASE[1] = (unsigned long) MODULE;					\
+} while(0)
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_MICROBLAZE_OLD
+#undef  MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "microblaze"
+
+#define elf_machine_type_class(type) \
+  (((type) == R_MICROBLAZE_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT \
+   | ((type) == R_MICROBLAZE_COPY) * ELF_RTYPE_CLASS_COPY)
+
+/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
+   first element of the GOT.  This must be inlined in a function which
+   uses global data.  */
+static inline Elf32_Addr
+elf_machine_dynamic (void)
+{
+  Elf32_Addr got_entry_0;
+  __asm__ __volatile__(
+    "lwi %0,r20,0"
+    :"=r"(got_entry_0)
+    );
+  return got_entry_0;
+}
+
+
+/* Return the run-time load address of the shared object.  */
+static inline Elf32_Addr
+elf_machine_load_address (void)
+{
+  /* Compute the difference between the runtime address of _DYNAMIC as seen
+     by a GOTOFF reference, and the link-time address found in the special
+     unrelocated first GOT entry.  */
+  Elf32_Addr dyn;
+  __asm__ __volatile__ (
+    "addik %0,r20,_DYNAMIC@GOTOFF"
+    : "=r"(dyn)
+    );
+  return dyn - elf_machine_dynamic ();
+}
+
+
+
+static __always_inline void
+elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
+		      Elf32_Word relative_count)
+{
+	Elf32_Rel * rpnt = (void *) rel_addr;
+	do {
+		Elf32_Addr *const reloc_addr = (void *) (load_off + (rpnt)->r_offset);
+
+		*reloc_addr += load_off;
+	} while (--relative_count);
+}