[81] | 1 | /* |
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| 2 | * File : loadexec.c |
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| 3 | * Author : Frédéric Pétrot |
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| 4 | * |
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| 5 | * Load an executable into an array using the GNU BFD |
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| 6 | * |
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| 7 | * $Log: loadexec.c,v $ |
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| 8 | * Revision 1.3 2006/06/08 14:32:41 nipo |
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| 9 | * Use _loading_ memory address rather than _virtual_ memory address when |
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| 10 | * loading objects. |
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| 11 | * |
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| 12 | * Patch from Alexandre Becoulet |
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| 13 | * |
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| 14 | * Revision 1.2 2006/02/21 10:37:40 buchmann |
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| 15 | * Changes : |
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| 16 | * - random optimizations |
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| 17 | * - now uses conditional expressions instead of if statements |
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| 18 | * - disables some useless assignments |
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| 19 | * - now uses shift operators instead of arithmetic operators |
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| 20 | * - fix documentations |
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| 21 | * |
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| 22 | * Revision 1.1.1.1 2005/01/27 13:42:45 wahid |
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| 23 | * First project import |
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| 24 | * Wahid |
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| 25 | * |
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| 26 | * Revision 1.1 2003/03/10 10:38:05 fred |
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| 27 | * Adding the bfd loader for good. |
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| 28 | * |
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| 29 | */ |
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| 30 | |
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| 31 | #include <stdio.h> |
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| 32 | #include <stdlib.h> |
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| 33 | #include <string.h> |
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| 34 | #include <bfd.h> |
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[117] | 35 | #include "../../Common/include/Debug.h" |
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[81] | 36 | |
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| 37 | #ifndef TRUE |
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| 38 | #define TRUE true |
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| 39 | #endif |
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| 40 | |
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| 41 | #ifndef FALSE |
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| 42 | #define FALSE false |
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| 43 | #endif |
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| 44 | |
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| 45 | /* Loading the sections sections of file file into the array |
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| 46 | * pointed to by emem. |
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| 47 | * esize is the expected size, but it can be modified by the function if it too |
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| 48 | * small for the sections |
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| 49 | * All sizes and addresses are given in bytes |
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| 50 | * eoffset is the address of the section with the lowest address among |
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| 51 | * all required sections. |
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| 52 | * Code should be self explanatory once you've read the 230 pages of |
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| 53 | * the BFD documentation :) */ |
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| 54 | |
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| 55 | typedef struct raminfo { |
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| 56 | void *mem; |
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| 57 | unsigned int size; |
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| 58 | unsigned int ladr; |
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| 59 | unsigned int hadr; |
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| 60 | const char *file; |
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| 61 | const char **sections; |
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| 62 | } raminfo; |
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| 63 | |
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| 64 | static void bindsection(bfd *exec, asection *sect, PTR x) |
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| 65 | { |
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| 66 | int i; |
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| 67 | raminfo *rinfo = x; |
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| 68 | |
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| 69 | for (i = 0; rinfo->sections[i]; i++) |
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| 70 | if (!strcmp(sect->name, rinfo->sections[i])) |
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| 71 | break; |
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| 72 | if (!rinfo->sections[i]) |
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| 73 | return; |
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| 74 | |
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| 75 | if ((sect->flags & SEC_LOAD) && !(sect->flags & SEC_IN_MEMORY)) { |
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| 76 | bfd_get_section_contents(exec, sect, |
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| 77 | rinfo->mem + (sect->lma - rinfo->ladr), |
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| 78 | 0, bfd_section_size(exec, sect)); |
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| 79 | sect->contents = rinfo->mem; |
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| 80 | } |
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| 81 | } |
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| 82 | |
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| 83 | static void sectionssize(bfd *exec, asection *sect, PTR x) |
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| 84 | { |
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| 85 | int i; |
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| 86 | raminfo *rinfo = x; |
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| 87 | |
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| 88 | for (i = 0; rinfo->sections[i]; i++) |
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| 89 | if (!strcmp(sect->name, rinfo->sections[i])) |
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| 90 | break; |
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| 91 | if (!rinfo->sections[i]) |
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| 92 | return; |
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| 93 | |
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| 94 | rinfo->size += bfd_section_size(exec, sect); |
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| 95 | rinfo->ladr = sect->lma < rinfo->ladr ? sect->lma : rinfo->ladr; |
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| 96 | rinfo->hadr = sect->lma + rinfo->size > rinfo->hadr ? |
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| 97 | sect->lma + rinfo->size : rinfo->hadr; |
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| 98 | } |
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| 99 | |
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| 100 | void loadexec(void **emem, int *esize, int *eoffset, const char *file, const char **sections) |
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| 101 | { |
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| 102 | bfd *exec; |
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| 103 | static int x; |
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| 104 | int i; |
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| 105 | raminfo ringo; |
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| 106 | |
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| 107 | if (!x) |
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| 108 | bfd_init(); |
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| 109 | |
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| 110 | exec = bfd_openr(file, NULL); |
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| 111 | |
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| 112 | if (!exec) { |
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[117] | 113 | cerr("Cannot open File '%s'\n", file); |
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[81] | 114 | exit(1); |
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| 115 | } |
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| 116 | |
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| 117 | if (bfd_check_format(exec, bfd_object) != TRUE && !(exec->flags & EXEC_P)) { |
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[117] | 118 | cerr("File %s is not an executable file\n", |
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| 119 | file); //bfd_get_filename(exec)); |
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[81] | 120 | exit(1); |
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| 121 | } |
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| 122 | |
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[117] | 123 | #if 0 |
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| 124 | cout("Loading sections "); |
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[81] | 125 | for (i = 0; sections[i]; i++) |
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[117] | 126 | __cout("%s%s", sections[i], ((sections[i+1]!=NULL)?", ":" ")); |
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| 127 | __cout("from \"%s\"\n",bfd_get_filename(exec)); |
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| 128 | //cout("of executable '%s' for '%s' architecture in format '%s'\n", |
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[81] | 129 | // bfd_get_filename(exec), bfd_printable_name(exec), exec->xvec->name); |
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| 130 | #endif |
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| 131 | |
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| 132 | /* Set input parameters to bindsection */ |
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| 133 | ringo.file = file; |
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| 134 | ringo.sections = sections; |
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| 135 | ringo.size = 0; |
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| 136 | ringo.ladr = ~0; |
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| 137 | ringo.hadr = 0; |
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| 138 | bfd_map_over_sections(exec, sectionssize, &ringo); |
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| 139 | /* Get output parameters from sectionssize */ |
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| 140 | if (ringo.size < ringo.hadr - ringo.ladr) |
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| 141 | ringo.size = ringo.hadr - ringo.ladr; |
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| 142 | *esize = ringo.size > *esize ? ringo.size : *esize; |
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| 143 | *eoffset = ringo.ladr; |
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| 144 | ringo.mem = malloc(*esize * sizeof(char)); |
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| 145 | /* Start over again from the start of the memory */ |
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| 146 | bfd_map_over_sections(exec, bindsection, &ringo); |
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| 147 | /* Get output parameters from bindsection */ |
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| 148 | |
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| 149 | *emem = ringo.mem; |
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| 150 | |
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| 151 | if (bfd_close(exec) == FALSE) { |
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| 152 | bfd_perror(exec->filename); |
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| 153 | exit(1); |
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| 154 | } |
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| 155 | } |
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