scoutos / prex-0.9.0 / bsp / boot / ppc / arch / elf_reloc.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2009, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/param.h> |
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31 | #include <sys/elf.h> |
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32 | #include <boot.h> |
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33 | |||
34 | int
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35 | relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sec)
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36 | { |
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37 | |||
38 | panic("invalid relocation type");
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39 | return -1; |
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40 | } |
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41 | |||
42 | int
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43 | relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sect)
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44 | { |
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45 | Elf32_Addr *where; |
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46 | uint32_t val; |
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47 | |||
48 | where = (Elf32_Addr *)(target_sect + rela->r_offset); |
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49 | val = sym_val + rela->r_addend; |
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50 | |||
51 | switch (ELF32_R_TYPE(rela->r_info)) {
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52 | case R_PPC_NONE:
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53 | break;
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54 | case R_PPC_ADDR32:
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55 | ELFDBG(("R_PPC_ADDR32\n"));
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56 | *(uint32_t *)where = val; |
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57 | break;
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58 | case R_PPC_ADDR16_LO:
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59 | ELFDBG(("R_PPC_ADDR16_LO\n"));
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60 | *(uint16_t *)where = (uint16_t)val; |
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61 | break;
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62 | case R_PPC_ADDR16_HI:
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63 | ELFDBG(("R_PPC_ADDR16_HI\n"));
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64 | *(uint16_t *)where = (uint16_t)(val >> 16);
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65 | break;
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66 | case R_PPC_ADDR16_HA:
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67 | ELFDBG(("R_PPC_ADDR16_HA\n"));
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68 | *(uint16_t *)where = (uint16_t)((val + 0x8000) >> 16); |
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69 | break;
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70 | case R_PPC_REL24:
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71 | ELFDBG(("R_PPC_REL24\n"));
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72 | *(uint32_t *)where = |
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73 | (*(uint32_t *)where & ~0x03fffffc)
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74 | | ((val - (uint32_t)where) |
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75 | & 0x03fffffc);
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76 | break;
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77 | case R_PPC_REL32:
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78 | ELFDBG(("R_PPC_REL32\n"));
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79 | *(uint32_t *)where = val - (uint32_t)where; |
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80 | break;
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81 | default:
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82 | ELFDBG(("Unkown relocation type=%d\n",
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83 | ELF32_R_TYPE(rela->r_info))); |
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84 | panic("relocation fail");
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85 | return -1; |
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86 | } |
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87 | return 0; |
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88 | } |