microblaze_v8: headers for executables format FLAT, ELF

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 120 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/elf.h b/arch/microblaze/include/asm/elf.h
new file mode 100644
index 000000000000..81337f241347
--- /dev/null
+++ b/arch/microblaze/include/asm/elf.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_ELF_H
+#define _ASM_MICROBLAZE_ELF_H
+
+/*
+ * Note there is no "official" ELF designation for Microblaze.
+ * I've snaffled the value from the microblaze binutils source code
+ * /binutils/microblaze/include/elf/microblaze.h
+ */
+#define EM_XILINX_MICROBLAZE    0xbaab
+#define ELF_ARCH                EM_XILINX_MICROBLAZE
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x)       ((x)->e_machine == EM_XILINX_MICROBLAZE)
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS       ELFCLASS32
+
+#endif /* _ASM_MICROBLAZE_ELF_H */
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
new file mode 100644
index 000000000000..acf0da543ef1
--- /dev/null
+++ b/arch/microblaze/include/asm/flat.h
@@ -0,0 +1,90 @@
+/*
+ * uClinux flat-format executables
+ *
+ * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_FLAT_H
+#define _ASM_MICROBLAZE_FLAT_H
+
+#include <asm/unaligned.h>
+
+#define flat_stack_align(sp) /* nothing needed */
+#define flat_argvp_envp_on_stack()      0
+#define flat_old_ram_flag(flags)        (flags)
+#define flat_reloc_valid(reloc, size)   ((reloc) <= (size))
+#define flat_set_persistent(relval, p)          0
+
+/*
+ * Microblaze works a little differently from other arches, because
+ * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
+ * over two instructions, an 'imm' instruction which provides the top
+ * 16 bits, then the instruction "proper" which provides the low 16
+ * bits.
+ */
+
+/*
+ * Crack open a symbol reference and extract the address to be
+ * relocated. rp is a potentially unaligned pointer to the
+ * reference
+ */
+
+static inline unsigned long
+flat_get_addr_from_rp(unsigned long *rp, unsigned long relval,
+                        unsigned long flags, unsigned long *persistent)
+{
+        unsigned long addr;
+        (void)flags;
+
+        /* Is it a split 64/32 reference? */
+        if (relval & 0x80000000) {
+                /* Grab the two halves of the reference */
+                unsigned long val_hi, val_lo;
+
+                val_hi = get_unaligned(rp);
+                val_lo = get_unaligned(rp+1);
+
+                /* Crack the address out */
+                addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
+        } else {
+                /* Get the address straight out */
+                addr = get_unaligned(rp);
+        }
+
+        return addr;
+}
+
+/*
+ * Insert an address into the symbol reference at rp. rp is potentially
+ * unaligned.
+ */
+
+static inline void
+flat_put_addr_at_rp(unsigned long *rp, unsigned long addr, unsigned long relval)
+{
+        /* Is this a split 64/32 reloc? */
+        if (relval & 0x80000000) {
+                /* Get the two "halves" */
+                unsigned long val_hi = get_unaligned(rp);
+                unsigned long val_lo = get_unaligned(rp + 1);
+
+                /* insert the address */
+                val_hi = (val_hi & 0xffff0000) | addr >> 16;
+                val_lo = (val_lo & 0xffff0000) | (addr & 0xffff);
+
+                /* store the two halves back into memory */
+                put_unaligned(val_hi, rp);
+                put_unaligned(val_lo, rp+1);
+        } else {
+                /* Put it straight in, no messing around */
+                put_unaligned(addr, rp);
+        }
+}
+
+#define flat_get_relocate_addr(rel)     (rel & 0x7fffffff)
+
+#endif /* _ASM_MICROBLAZE_FLAT_H */