scoutos / prex-0.9.0 / usr / arch / arm / elf_reloc.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2006, 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 | #include <sys/elf.h> |
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30 | #include <sys/syslog.h> |
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31 | |||
32 | int
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33 | relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
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34 | { |
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35 | Elf32_Addr *where, tmp; |
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36 | Elf32_Sword addend; |
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37 | |||
38 | where = (Elf32_Addr *)(target_sect + rel->r_offset); |
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39 | |||
40 | switch (ELF32_R_TYPE(rel->r_info)) {
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41 | case R_ARM_NONE:
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42 | break;
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43 | case R_ARM_ABS32:
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44 | *where += (Elf32_Addr)sym_val; |
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45 | /* printf("R_ARM_ABS32: %x -> %x\n", where, *where); */
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46 | break;
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47 | case R_ARM_PC24:
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48 | case R_ARM_PLT32:
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49 | case R_ARM_CALL:
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50 | case R_ARM_JUMP24:
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51 | addend = *where & 0x00ffffff;
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52 | if (addend & 0x00800000) |
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53 | addend |= 0xff000000;
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54 | tmp = sym_val - (Elf32_Addr)where + (addend << 2);
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55 | tmp >>= 2;
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56 | *where = (*where & 0xff000000) | (tmp & 0x00ffffff); |
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57 | /* printf("R_ARM_PC24: %x -> %x\n", where, *where); */
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58 | break;
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59 | default:
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60 | #ifdef DEBUG
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61 | syslog(LOG_ERR, "relocation fail type=%d\n", ELF32_R_TYPE(rel->r_info));
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62 | #endif
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63 | return -1; |
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64 | } |
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65 | return 0; |
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66 | } |
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67 | |||
68 | int
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69 | relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
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70 | { |
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71 | /* printf("Invalid relocation type\n"); */
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72 | return -1; |
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73 | } |