2 * arch/blackfin/kernel/flat.c
4 * Copyright (C) 2007 Analog Devices, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/flat.h>
25 #define FLAT_BFIN_RELOC_TYPE_16_BIT 0
26 #define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
27 #define FLAT_BFIN_RELOC_TYPE_32_BIT 2
29 unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
32 unsigned long *persistent)
34 unsigned short *usptr = (unsigned short *)ptr;
35 int type = (relval >> 26) & 7;
39 case FLAT_BFIN_RELOC_TYPE_16_BIT:
40 case FLAT_BFIN_RELOC_TYPE_16H_BIT:
41 usptr = (unsigned short *)ptr;
42 pr_debug("*usptr = %x", get_unaligned(usptr));
43 val = get_unaligned(usptr);
47 case FLAT_BFIN_RELOC_TYPE_32_BIT:
48 pr_debug("*ptr = %lx", get_unaligned(ptr));
49 val = get_unaligned(ptr);
53 pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type);
58 * Stack-relative relocs contain the offset into the stack, we
59 * have to add the stack's start address here and return 1 from
60 * flat_addr_absolute to prevent the normal address calculations
62 if (relval & (1 << 29))
63 return val + current->mm->context.end_brk;
65 if ((flags & FLAT_FLAG_GOTPIC) == 0)
69 EXPORT_SYMBOL(bfin_get_addr_from_rp);
72 * Insert the address ADDR into the symbol reference at RP;
73 * RELVAL is the raw relocation-table entry from which RP is derived
75 void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
78 unsigned short *usptr = (unsigned short *)ptr;
79 int type = (relval >> 26) & 7;
82 case FLAT_BFIN_RELOC_TYPE_16_BIT:
83 put_unaligned(addr, usptr);
84 pr_debug("new value %x at %p", get_unaligned(usptr), usptr);
87 case FLAT_BFIN_RELOC_TYPE_16H_BIT:
88 put_unaligned(addr >> 16, usptr);
89 pr_debug("new value %x", get_unaligned(usptr));
92 case FLAT_BFIN_RELOC_TYPE_32_BIT:
93 put_unaligned(addr, ptr);
94 pr_debug("new ptr =%lx", get_unaligned(ptr));
98 EXPORT_SYMBOL(bfin_put_addr_at_rp);