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annotate arm7dis/common.c @ 389:623316d1ece7

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compal/iMelody: capturing initial observations
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 31 Mar 2022 20:56:56 +0000
parents c883e60df239
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
107
c883e60df239 arm7dis: README and header comments added
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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
86
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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 }