Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/blackfin/kernel/flat.c |
| 3 | * |
| 4 | * Copyright (C) 2007 Analog Devices, Inc. |
| 5 | * |
| 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. |
| 10 | * |
| 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. |
| 15 | * |
| 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 |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/flat.h> |
| 24 | |
| 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 |
| 28 | |
| 29 | unsigned long bfin_get_addr_from_rp(unsigned long *ptr, |
| 30 | unsigned long relval, |
| 31 | unsigned long flags, |
| 32 | unsigned long *persistent) |
| 33 | { |
| 34 | unsigned short *usptr = (unsigned short *)ptr; |
| 35 | int type = (relval >> 26) & 7; |
| 36 | unsigned long val; |
| 37 | |
| 38 | switch (type) { |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 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); |
| 44 | val += *persistent; |
| 45 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 46 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 47 | case FLAT_BFIN_RELOC_TYPE_32_BIT: |
| 48 | pr_debug("*ptr = %lx", get_unaligned(ptr)); |
| 49 | val = get_unaligned(ptr); |
| 50 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 51 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 52 | default: |
| 53 | pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type); |
| 54 | return 0; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | /* |
| 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 |
| 61 | */ |
| 62 | if (relval & (1 << 29)) |
| 63 | return val + current->mm->context.end_brk; |
| 64 | |
| 65 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
| 66 | val = htonl(val); |
| 67 | return val; |
| 68 | } |
| 69 | EXPORT_SYMBOL(bfin_get_addr_from_rp); |
| 70 | |
| 71 | /* |
| 72 | * Insert the address ADDR into the symbol reference at RP; |
| 73 | * RELVAL is the raw relocation-table entry from which RP is derived |
| 74 | */ |
| 75 | void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr, |
| 76 | unsigned long relval) |
| 77 | { |
| 78 | unsigned short *usptr = (unsigned short *)ptr; |
| 79 | int type = (relval >> 26) & 7; |
| 80 | |
| 81 | switch (type) { |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 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); |
| 85 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 86 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 87 | case FLAT_BFIN_RELOC_TYPE_16H_BIT: |
| 88 | put_unaligned(addr >> 16, usptr); |
| 89 | pr_debug("new value %x", get_unaligned(usptr)); |
| 90 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 91 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 92 | case FLAT_BFIN_RELOC_TYPE_32_BIT: |
| 93 | put_unaligned(addr, ptr); |
| 94 | pr_debug("new ptr =%lx", get_unaligned(ptr)); |
| 95 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 96 | } |
| 97 | } |
| 98 | EXPORT_SYMBOL(bfin_put_addr_at_rp); |