1 files changed, 101 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/flat.c b/arch/blackfin/kernel/flat.c
new file mode 100644
index 000000000000..a92587b628b5
--- /dev/null
+++ b/arch/blackfin/kernel/flat.c
@@ -0,0 +1,101 @@
+/*
+ *  arch/blackfin/kernel/flat.c
+ *
+ *  Copyright (C) 2007 Analog Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/flat.h>
+
+#define FLAT_BFIN_RELOC_TYPE_16_BIT 0
+#define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
+#define FLAT_BFIN_RELOC_TYPE_32_BIT 2
+
+unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
+		unsigned long relval,
+		unsigned long flags,
+		unsigned long *persistent)
+{
+	unsigned short *usptr = (unsigned short *)ptr;
+	int type = (relval >> 26) & 7;
+	unsigned long val;
+
+	switch (type) {
+		case FLAT_BFIN_RELOC_TYPE_16_BIT:
+		case FLAT_BFIN_RELOC_TYPE_16H_BIT:
+			usptr = (unsigned short *)ptr;
+			pr_debug("*usptr = %x", get_unaligned(usptr));
+			val = get_unaligned(usptr);
+			val += *persistent;
+			break;
+
+		case FLAT_BFIN_RELOC_TYPE_32_BIT:
+			pr_debug("*ptr = %lx", get_unaligned(ptr));
+			val = get_unaligned(ptr);
+			break;
+
+		default:
+			pr_debug("BINFMT_FLAT: Unknown relocation type %x\n",
+				type);
+
+			return 0;
+	}
+
+	/*
+	 * Stack-relative relocs contain the offset into the stack, we
+	 * have to add the stack's start address here and return 1 from
+	 * flat_addr_absolute to prevent the normal address calculations
+	 */
+	if (relval & (1 << 29))
+		return val + current->mm->context.end_brk;
+
+	if ((flags & FLAT_FLAG_GOTPIC) == 0)
+		val = htonl(val);
+	return val;
+}
+EXPORT_SYMBOL(bfin_get_addr_from_rp);
+
+/*
+ * Insert the address ADDR into the symbol reference at RP;
+ * RELVAL is the raw relocation-table entry from which RP is derived
+ */
+void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
+		unsigned long relval)
+{
+	unsigned short *usptr = (unsigned short *)ptr;
+	int type = (relval >> 26) & 7;
+
+	switch (type) {
+		case FLAT_BFIN_RELOC_TYPE_16_BIT:
+			put_unaligned(addr, usptr);
+			pr_debug("new value %x at %p", get_unaligned(usptr),
+				usptr);
+			break;
+
+		case FLAT_BFIN_RELOC_TYPE_16H_BIT:
+			put_unaligned(addr >> 16, usptr);
+			pr_debug("new value %x", get_unaligned(usptr));
+			break;
+
+		case FLAT_BFIN_RELOC_TYPE_32_BIT:
+			put_unaligned(addr, ptr);
+			pr_debug("new ptr =%lx", get_unaligned(ptr));
+			break;
+	}
+}
+EXPORT_SYMBOL(bfin_put_addr_at_rp);