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annotate ticoff/lowlevel.c @ 118:193926ccd1ec

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tiobjd: better handling of section-relative relocs
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Thu, 03 Apr 2014 07:47:03 +0000
parents 2eef88395908
children
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74
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1 /*
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2 * This C module implements the low-level steps of TI COFF image analysis.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/file.h>
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7 #include <sys/stat.h>
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8 #include <sys/mman.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include "filestruct.h"
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13 #include "globals.h"
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14
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15 mmap_objfile()
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16 {
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17 int fd;
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18 struct stat st;
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19
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20 fd = open(objfilename, O_RDONLY);
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21 if (fd < 0) {
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22 perror(objfilename);
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23 exit(1);
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24 }
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25 fstat(fd, &st);
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26 if (!S_ISREG(st.st_mode)) {
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27 fprintf(stderr, "error: %s is not a regular file\n",
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28 objfilename);
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29 exit(1);
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30 }
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31 objfile_tot_size = st.st_size;
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32 filemap = mmap(NULL, objfile_tot_size, PROT_READ, MAP_PRIVATE, fd, 0L);
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33 if (filemap == MAP_FAILED) {
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34 perror("mmap");
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35 exit(1);
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36 }
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37 close(fd);
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38 }
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39
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40 unsigned
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41 get_u16(ptr)
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42 u_char *ptr;
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43 {
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44 return ptr[0] | ptr[1] << 8;
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45 }
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46
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47 get_s16(ptr)
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48 u_char *ptr;
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49 {
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50 int i;
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51
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52 i = ptr[0] | ptr[1] << 8;
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53 if (i >= 32768)
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54 i -= 65536;
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55 return(i);
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56 }
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57
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58 unsigned
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59 get_u32(ptr)
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60 u_char *ptr;
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61 {
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62 return ptr[0] | ptr[1] << 8 | ptr[2] << 16 | ptr[3] << 24;
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63 }
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64
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65 initial_parse_hdr()
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66 {
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67 unsigned symtab_offset;
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68
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69 filehdr_struct = (struct external_filehdr *) filemap;
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70 if (get_u16(filehdr_struct->f_magic) != 0xC2) {
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71 fprintf(stderr, "error: %s is not a TI COFF2 object\n",
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72 objfilename);
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73 exit(1);
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74 }
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75 if (get_u16(filehdr_struct->f_target_id) != 0x97) {
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76 fprintf(stderr, "error: TI COFF object %s is not for TMS470\n",
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77 objfilename);
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78 exit(1);
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79 }
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80 if (get_u16(filehdr_struct->f_opthdr)) {
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81 fprintf(stderr,
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82 "error: %s has the \"optional\" header present\n",
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83 objfilename);
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84 exit(1);
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85 }
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86 sections_raw = (struct external_scnhdr *)
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87 (filemap + sizeof(struct external_filehdr));
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88 nsections = get_u16(filehdr_struct->f_nscns);
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89 symtab_offset = get_u32(filehdr_struct->f_symptr);
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90 symtab_raw = (struct external_syment *)(filemap + symtab_offset);
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91 nsymtab = get_u32(filehdr_struct->f_nsyms);
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92 strtab_offset = symtab_offset +
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93 sizeof(struct external_syment) * nsymtab;
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94 }