From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/blackfin/kernel/flat.c | 84 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 arch/blackfin/kernel/flat.c

(limited to 'arch/blackfin/kernel/flat.c')

diff --git a/arch/blackfin/kernel/flat.c b/arch/blackfin/kernel/flat.c
new file mode 100644
index 000000000..a88daddbf
--- /dev/null
+++ b/arch/blackfin/kernel/flat.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2007 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#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);
-- 
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