[81] | 1 | /* |
---|
| 2 | * File : loadexec.c |
---|
| 3 | * Author : Frédéric Pétrot |
---|
| 4 | * |
---|
| 5 | * Load an executable into an array using the GNU BFD |
---|
| 6 | * |
---|
| 7 | * $Log: loadexec.c,v $ |
---|
| 8 | * Revision 1.3 2006/06/08 14:32:41 nipo |
---|
| 9 | * Use _loading_ memory address rather than _virtual_ memory address when |
---|
| 10 | * loading objects. |
---|
| 11 | * |
---|
| 12 | * Patch from Alexandre Becoulet |
---|
| 13 | * |
---|
| 14 | * Revision 1.2 2006/02/21 10:37:40 buchmann |
---|
| 15 | * Changes : |
---|
| 16 | * - random optimizations |
---|
| 17 | * - now uses conditional expressions instead of if statements |
---|
| 18 | * - disables some useless assignments |
---|
| 19 | * - now uses shift operators instead of arithmetic operators |
---|
| 20 | * - fix documentations |
---|
| 21 | * |
---|
| 22 | * Revision 1.1.1.1 2005/01/27 13:42:45 wahid |
---|
| 23 | * First project import |
---|
| 24 | * Wahid |
---|
| 25 | * |
---|
| 26 | * Revision 1.1 2003/03/10 10:38:05 fred |
---|
| 27 | * Adding the bfd loader for good. |
---|
| 28 | * |
---|
| 29 | */ |
---|
| 30 | |
---|
| 31 | #include <stdio.h> |
---|
| 32 | #include <stdlib.h> |
---|
| 33 | #include <string.h> |
---|
| 34 | #include <bfd.h> |
---|
| 35 | |
---|
| 36 | #ifndef TRUE |
---|
| 37 | #define TRUE true |
---|
| 38 | #endif |
---|
| 39 | |
---|
| 40 | #ifndef FALSE |
---|
| 41 | #define FALSE false |
---|
| 42 | #endif |
---|
| 43 | |
---|
| 44 | /* Loading the sections sections of file file into the array |
---|
| 45 | * pointed to by emem. |
---|
| 46 | * esize is the expected size, but it can be modified by the function if it too |
---|
| 47 | * small for the sections |
---|
| 48 | * All sizes and addresses are given in bytes |
---|
| 49 | * eoffset is the address of the section with the lowest address among |
---|
| 50 | * all required sections. |
---|
| 51 | * Code should be self explanatory once you've read the 230 pages of |
---|
| 52 | * the BFD documentation :) */ |
---|
| 53 | |
---|
| 54 | typedef struct raminfo { |
---|
| 55 | void *mem; |
---|
| 56 | unsigned int size; |
---|
| 57 | unsigned int ladr; |
---|
| 58 | unsigned int hadr; |
---|
| 59 | const char *file; |
---|
| 60 | const char **sections; |
---|
| 61 | } raminfo; |
---|
| 62 | |
---|
| 63 | static void bindsection(bfd *exec, asection *sect, PTR x) |
---|
| 64 | { |
---|
| 65 | int i; |
---|
| 66 | raminfo *rinfo = x; |
---|
| 67 | |
---|
| 68 | for (i = 0; rinfo->sections[i]; i++) |
---|
| 69 | if (!strcmp(sect->name, rinfo->sections[i])) |
---|
| 70 | break; |
---|
| 71 | if (!rinfo->sections[i]) |
---|
| 72 | return; |
---|
| 73 | |
---|
| 74 | if ((sect->flags & SEC_LOAD) && !(sect->flags & SEC_IN_MEMORY)) { |
---|
| 75 | bfd_get_section_contents(exec, sect, |
---|
| 76 | rinfo->mem + (sect->lma - rinfo->ladr), |
---|
| 77 | 0, bfd_section_size(exec, sect)); |
---|
| 78 | sect->contents = rinfo->mem; |
---|
| 79 | } |
---|
| 80 | } |
---|
| 81 | |
---|
| 82 | static void sectionssize(bfd *exec, asection *sect, PTR x) |
---|
| 83 | { |
---|
| 84 | int i; |
---|
| 85 | raminfo *rinfo = x; |
---|
| 86 | |
---|
| 87 | for (i = 0; rinfo->sections[i]; i++) |
---|
| 88 | if (!strcmp(sect->name, rinfo->sections[i])) |
---|
| 89 | break; |
---|
| 90 | if (!rinfo->sections[i]) |
---|
| 91 | return; |
---|
| 92 | |
---|
| 93 | rinfo->size += bfd_section_size(exec, sect); |
---|
| 94 | rinfo->ladr = sect->lma < rinfo->ladr ? sect->lma : rinfo->ladr; |
---|
| 95 | rinfo->hadr = sect->lma + rinfo->size > rinfo->hadr ? |
---|
| 96 | sect->lma + rinfo->size : rinfo->hadr; |
---|
| 97 | } |
---|
| 98 | |
---|
| 99 | void loadexec(void **emem, int *esize, int *eoffset, const char *file, const char **sections) |
---|
| 100 | { |
---|
| 101 | bfd *exec; |
---|
| 102 | static int x; |
---|
| 103 | int i; |
---|
| 104 | raminfo ringo; |
---|
| 105 | |
---|
| 106 | if (!x) |
---|
| 107 | bfd_init(); |
---|
| 108 | |
---|
| 109 | exec = bfd_openr(file, NULL); |
---|
| 110 | |
---|
| 111 | if (!exec) { |
---|
| 112 | fprintf(stderr, "Cannot open File '%s'\n", file); |
---|
| 113 | exit(1); |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | if (bfd_check_format(exec, bfd_object) != TRUE && !(exec->flags & EXEC_P)) { |
---|
| 117 | fprintf(stderr, "File %s is not an executable file\n", |
---|
| 118 | file); //bfd_get_filename(exec)); |
---|
| 119 | exit(1); |
---|
| 120 | } |
---|
| 121 | |
---|
| 122 | #if 1 |
---|
| 123 | printf("Loading sections "); |
---|
| 124 | for (i = 0; sections[i]; i++) |
---|
| 125 | printf("%s%s", sections[i], sections[i+1] ? ", " : " "); |
---|
| 126 | printf("from \"%s\"\n",bfd_get_filename(exec)); |
---|
| 127 | //printf("of executable '%s' for '%s' architecture in format '%s'\n", |
---|
| 128 | // bfd_get_filename(exec), bfd_printable_name(exec), exec->xvec->name); |
---|
| 129 | #endif |
---|
| 130 | |
---|
| 131 | /* Set input parameters to bindsection */ |
---|
| 132 | ringo.file = file; |
---|
| 133 | ringo.sections = sections; |
---|
| 134 | ringo.size = 0; |
---|
| 135 | ringo.ladr = ~0; |
---|
| 136 | ringo.hadr = 0; |
---|
| 137 | bfd_map_over_sections(exec, sectionssize, &ringo); |
---|
| 138 | /* Get output parameters from sectionssize */ |
---|
| 139 | if (ringo.size < ringo.hadr - ringo.ladr) |
---|
| 140 | ringo.size = ringo.hadr - ringo.ladr; |
---|
| 141 | *esize = ringo.size > *esize ? ringo.size : *esize; |
---|
| 142 | *eoffset = ringo.ladr; |
---|
| 143 | ringo.mem = malloc(*esize * sizeof(char)); |
---|
| 144 | /* Start over again from the start of the memory */ |
---|
| 145 | bfd_map_over_sections(exec, bindsection, &ringo); |
---|
| 146 | /* Get output parameters from bindsection */ |
---|
| 147 | |
---|
| 148 | *emem = ringo.mem; |
---|
| 149 | |
---|
| 150 | if (bfd_close(exec) == FALSE) { |
---|
| 151 | bfd_perror(exec->filename); |
---|
| 152 | exit(1); |
---|
| 153 | } |
---|
| 154 | } |
---|