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annotate arm7dis/common.c @ 87:f7fba8518fa2

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armdis: skeleton compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 29 Mar 2014 00:23:16 +0000
parents 537cf2245d98
children c883e60df239
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rev   line source
86
537cf2245d98 beginning of ARM7 disassembler
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1 #include <sys/types.h>
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2 #include <sys/file.h>
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3 #include <sys/stat.h>
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4 #include <sys/mman.h>
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <unistd.h>
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8
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9 char *binfilename;
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10 u_char *filemap;
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11 unsigned disasm_len, base_vma;
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12
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13 common_init(argc, argv, instr_size)
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14 char **argv;
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15 {
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16 int fd;
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17 struct stat st;
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18 unsigned fileoff;
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19
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20 if (argc < 2 || argc > 5) {
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21 fprintf(stderr,
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22 "usage: %s binfile [file-offset [len [vaddr]]]\n",
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23 argv[0]);
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24 exit(1);
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25 }
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26 binfilename = argv[1];
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27 fd = open(binfilename, O_RDONLY);
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28 if (fd < 0) {
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29 perror(binfilename);
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30 exit(1);
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31 }
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32 fstat(fd, &st);
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33 if (!S_ISREG(st.st_mode)) {
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34 fprintf(stderr, "error: %s is not a regular file\n",
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35 binfilename);
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36 exit(1);
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37 }
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38 if (argc > 2)
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39 fileoff = strtoul(argv[2], 0, 0);
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40 else
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41 fileoff = 0;
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42 if (fileoff > st.st_size) {
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43 fprintf(stderr,
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44 "error: specified file offset is past the end of file\n");
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45 exit(1);
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46 }
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47 if (argc > 3) {
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48 disasm_len = strtoul(argv[3], 0, 0);
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49 if (disasm_len > st.st_size - fileoff) {
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50 fprintf(stderr,
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51 "error: specified length is past the end of file\n");
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52 exit(1);
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53 }
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54 } else
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55 disasm_len = st.st_size - fileoff;
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56 if (disasm_len & (instr_size - 1)) {
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57 fprintf(stderr,
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58 "error: length of region to be disassembled must be a multiple of %d bytes\n",
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59 instr_size);
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60 exit(1);
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61 }
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62 filemap = mmap(NULL, (size_t) disasm_len, PROT_READ, MAP_PRIVATE, fd,
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63 (off_t) fileoff);
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64 if (filemap == MAP_FAILED) {
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65 perror("mmap");
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66 exit(1);
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67 }
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68 close(fd);
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69 if (argc > 4)
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70 base_vma = strtoul(argv[4], 0, 0);
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71 else
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72 base_vma = fileoff;
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73 return(0);
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74 }
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75
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76 unsigned
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77 get_u16(ptr)
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78 u_char *ptr;
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79 {
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80 return ptr[0] | ptr[1] << 8;
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81 }
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82
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83 unsigned
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84 get_u32(ptr)
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85 u_char *ptr;
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86 {
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87 return ptr[0] | ptr[1] << 8 | ptr[2] << 16 | ptr[3] << 24;
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88 }