Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
Robin Getz | 96f1050 | 2009-09-24 14:11:24 +0000 | [diff] [blame] | 2 | * Copyright 2007 Analog Devices Inc. |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 3 | * |
Robin Getz | 96f1050 | 2009-09-24 14:11:24 +0000 | [diff] [blame] | 4 | * Licensed under the GPL-2. |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 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 | |
| 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) { |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 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; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 32 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 33 | case FLAT_BFIN_RELOC_TYPE_32_BIT: |
| 34 | pr_debug("*ptr = %lx", get_unaligned(ptr)); |
| 35 | val = get_unaligned(ptr); |
| 36 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 37 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 38 | default: |
| 39 | pr_debug("BINFMT_FLAT: Unknown relocation type %x\n", type); |
| 40 | return 0; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 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 | */ |
| 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) { |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 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; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 72 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 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; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 77 | |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 78 | case FLAT_BFIN_RELOC_TYPE_32_BIT: |
| 79 | put_unaligned(addr, ptr); |
| 80 | pr_debug("new ptr =%lx", get_unaligned(ptr)); |
| 81 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 82 | } |
| 83 | } |
| 84 | EXPORT_SYMBOL(bfin_put_addr_at_rp); |