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-rw-r--r--arch/blackfin/kernel/flat.c84
1 files changed, 84 insertions, 0 deletions
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);