1 files changed, 90 insertions, 0 deletions
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 */