LXR linux/arch/blackfin/kernel/flat.c

   1/*
   2 * Copyright 2007 Analog Devices Inc.
   3 *
   4 * Licensed under the GPL-2.
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/sched.h>
   9#include <linux/flat.h>
  10
  11#define FLAT_BFIN_RELOC_TYPE_16_BIT 0
  12#define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
  13#define FLAT_BFIN_RELOC_TYPE_32_BIT 2
  14
  15unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
  16                unsigned long relval,
  17                unsigned long flags,
  18                unsigned long *persistent)
  19{
  20        unsigned short *usptr = (unsigned short *)ptr;
  21        int type = (relval >> 26) & 7;
  22        unsigned long val;
  23
  24        switch (type) {
  25        case FLAT_BFIN_RELOC_TYPE_16_BIT:
  26        case FLAT_BFIN_RELOC_TYPE_16H_BIT:
  27                usptr = (unsigned short *)ptr;
  28                pr_debug("*usptr = %x", get_unaligned(usptr));
  29                val = get_unaligned(usptr);
  30                val += *persistent;
  31                break;
  32
  33        case FLAT_BFIN_RELOC_TYPE_32_BIT:
  34                pr_debug("*ptr = %lx", get_unaligned(ptr));
  35                val = get_unaligned(ptr);
  36                break;
  37
  38        default:
  39                pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type);
  40                return 0;
  41        }
  42
  43        /*
  44         * Stack-relative relocs contain the offset into the stack, we
  45         * have to add the stack's start address here and return 1 from
  46         * flat_addr_absolute to prevent the normal address calculations
  47         */
  48        if (relval & (1 << 29))
  49                return val + current->mm->context.end_brk;
  50
  51        if ((flags & FLAT_FLAG_GOTPIC) == 0)
  52                val = htonl(val);
  53        return val;
  54}
  55EXPORT_SYMBOL(bfin_get_addr_from_rp);
  56
  57/*
  58 * Insert the address ADDR into the symbol reference at RP;
  59 * RELVAL is the raw relocation-table entry from which RP is derived
  60 */
  61void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
  62                unsigned long relval)
  63{
  64        unsigned short *usptr = (unsigned short *)ptr;
  65        int type = (relval >> 26) & 7;
  66
  67        switch (type) {
  68        case FLAT_BFIN_RELOC_TYPE_16_BIT:
  69                put_unaligned(addr, usptr);
  70                pr_debug("new value %x at %p", get_unaligned(usptr), usptr);
  71                break;
  72
  73        case FLAT_BFIN_RELOC_TYPE_16H_BIT:
  74                put_unaligned(addr >> 16, usptr);
  75                pr_debug("new value %x", get_unaligned(usptr));
  76                break;
  77
  78        case FLAT_BFIN_RELOC_TYPE_32_BIT:
  79                put_unaligned(addr, ptr);
  80                pr_debug("new ptr =%lx", get_unaligned(ptr));
  81                break;
  82        }
  83}
  84EXPORT_SYMBOL(bfin_put_addr_at_rp);
  85