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
bfin_get_addr_from_rp(unsigned long * ptr,unsigned long relval,unsigned long flags,unsigned long * persistent)15 unsigned 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 }
55 EXPORT_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 */
bfin_put_addr_at_rp(unsigned long * ptr,unsigned long addr,unsigned long relval)61 void 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 }
84 EXPORT_SYMBOL(bfin_put_addr_at_rp);
85