FreeCalypso > hg > freecalypso-reveng
annotate leo-obj/tool/lowlevel.c @ 185:a820d9f9adbf
leo-obj: started analyzing tpudrv.lib objects
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 11 Aug 2014 21:32:30 +0000 |
parents | 87b82398a08b |
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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 } |