FreeCalypso > hg > freecalypso-reveng
annotate arm7dis/common.c @ 107:c883e60df239
arm7dis: README and header comments added
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 31 Mar 2014 06:49:27 +0000 |
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1 /* |
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2 * Lean and mean ARM7TDMI disassembler |
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3 * Written by Spacefalcon the Outlaw |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <sys/file.h> |
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8 #include <sys/stat.h> |
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9 #include <sys/mman.h> |
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10 #include <stdio.h> |
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11 #include <stdlib.h> |
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12 #include <unistd.h> |
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13 |
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14 char *binfilename; |
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15 u_char *filemap; |
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16 unsigned disasm_len, base_vma; |
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17 |
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18 common_init(argc, argv, instr_size) |
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19 char **argv; |
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20 { |
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21 int fd; |
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22 struct stat st; |
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23 unsigned fileoff; |
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24 |
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25 if (argc < 2 || argc > 5) { |
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26 fprintf(stderr, |
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27 "usage: %s binfile [file-offset [len [vaddr]]]\n", |
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28 argv[0]); |
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29 exit(1); |
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30 } |
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31 binfilename = argv[1]; |
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32 fd = open(binfilename, O_RDONLY); |
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33 if (fd < 0) { |
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34 perror(binfilename); |
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35 exit(1); |
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36 } |
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37 fstat(fd, &st); |
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38 if (!S_ISREG(st.st_mode)) { |
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39 fprintf(stderr, "error: %s is not a regular file\n", |
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40 binfilename); |
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41 exit(1); |
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42 } |
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43 if (argc > 2) |
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44 fileoff = strtoul(argv[2], 0, 0); |
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45 else |
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46 fileoff = 0; |
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47 if (fileoff > st.st_size) { |
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48 fprintf(stderr, |
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49 "error: specified file offset is past the end of file\n"); |
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50 exit(1); |
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51 } |
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52 if (argc > 3) { |
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53 disasm_len = strtoul(argv[3], 0, 0); |
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54 if (disasm_len > st.st_size - fileoff) { |
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55 fprintf(stderr, |
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56 "error: specified length is past the end of file\n"); |
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57 exit(1); |
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58 } |
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59 } else |
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60 disasm_len = st.st_size - fileoff; |
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61 if (disasm_len & (instr_size - 1)) { |
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62 fprintf(stderr, |
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63 "error: length of region to be disassembled must be a multiple of %d bytes\n", |
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64 instr_size); |
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65 exit(1); |
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66 } |
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67 filemap = mmap(NULL, (size_t) disasm_len, PROT_READ, MAP_PRIVATE, fd, |
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68 (off_t) fileoff); |
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69 if (filemap == MAP_FAILED) { |
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70 perror("mmap"); |
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71 exit(1); |
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72 } |
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73 close(fd); |
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74 if (argc > 4) |
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75 base_vma = strtoul(argv[4], 0, 0); |
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76 else |
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77 base_vma = fileoff; |
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78 return(0); |
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79 } |
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80 |
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81 unsigned |
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82 get_u16(ptr) |
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83 u_char *ptr; |
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84 { |
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85 return ptr[0] | ptr[1] << 8; |
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86 } |
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87 |
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88 unsigned |
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89 get_u32(ptr) |
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90 u_char *ptr; |
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91 { |
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92 return ptr[0] | ptr[1] << 8 | ptr[2] << 16 | ptr[3] << 24; |
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93 } |