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1 /* |
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2 x.remscn.c - implementation of the elfx_remscn(3) function. |
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3 Copyright (C) 1995 - 2001, 2003 Michael Riepe |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 */ |
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19 |
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20 #include <private.h> |
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21 |
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22 #ifndef lint |
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23 static const char rcsid[] = "@(#) $Id: x.remscn.c,v 1.14 2005/05/21 15:39:27 michael Exp $"; |
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24 #endif /* lint */ |
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25 |
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26 size_t |
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27 elfx_remscn(Elf *elf, Elf_Scn *scn) { |
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28 Elf_Scn *pscn; |
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29 Scn_Data *sd; |
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30 Scn_Data *tmp; |
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31 size_t index; |
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32 |
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33 if (!elf || !scn) { |
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34 return SHN_UNDEF; |
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35 } |
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36 elf_assert(elf->e_magic == ELF_MAGIC); |
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37 if (elf->e_kind != ELF_K_ELF) { |
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38 seterr(ERROR_NOTELF); |
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39 return SHN_UNDEF; |
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40 } |
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41 elf_assert(scn->s_magic == SCN_MAGIC); |
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42 elf_assert(elf->e_ehdr); |
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43 if (scn->s_elf != elf) { |
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44 seterr(ERROR_ELFSCNMISMATCH); |
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45 return SHN_UNDEF; |
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46 } |
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47 elf_assert(elf->e_scn_1); |
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48 if (scn == elf->e_scn_1) { |
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49 seterr(ERROR_NULLSCN); |
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50 return SHN_UNDEF; |
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51 } |
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52 |
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53 /* |
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54 * Find previous section. |
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55 */ |
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56 for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) { |
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57 if (pscn->s_link == scn) { |
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58 break; |
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59 } |
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60 } |
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61 if (pscn->s_link != scn) { |
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62 seterr(ERROR_ELFSCNMISMATCH); |
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63 return SHN_UNDEF; |
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64 } |
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65 |
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66 /* |
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67 * Unlink section. |
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68 */ |
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69 if (elf->e_scn_n == scn) { |
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70 elf->e_scn_n = pscn; |
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71 } |
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72 pscn->s_link = scn->s_link; |
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73 index = scn->s_index; |
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74 |
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75 /* |
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76 * Free section descriptor and data. |
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77 */ |
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78 for (sd = scn->s_data_1; sd; sd = tmp) { |
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79 elf_assert(sd->sd_magic == DATA_MAGIC); |
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80 elf_assert(sd->sd_scn == scn); |
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81 tmp = sd->sd_link; |
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82 if (sd->sd_free_data && sd->sd_memdata) { |
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83 free(sd->sd_memdata); |
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84 } |
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85 if (sd->sd_freeme) { |
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86 free(sd); |
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87 } |
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88 } |
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89 if ((sd = scn->s_rawdata)) { |
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90 elf_assert(sd->sd_magic == DATA_MAGIC); |
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91 elf_assert(sd->sd_scn == scn); |
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92 if (sd->sd_free_data && sd->sd_memdata) { |
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93 free(sd->sd_memdata); |
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94 } |
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95 if (sd->sd_freeme) { |
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96 free(sd); |
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97 } |
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98 } |
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99 if (scn->s_freeme) { |
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100 elf_assert(scn->s_index > 0); |
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101 free(scn); |
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102 } |
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103 |
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104 /* |
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105 * Adjust section indices. |
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106 */ |
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107 for (scn = pscn->s_link; scn; scn = scn->s_link) { |
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108 elf_assert(scn->s_index > index); |
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109 scn->s_index--; |
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110 } |
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111 |
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112 /* |
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113 * Adjust section count in ELF header |
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114 */ |
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115 if (_elf_update_shnum(elf, elf->e_scn_n->s_index + 1)) { |
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116 return SHN_UNDEF; |
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117 } |
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118 return index; |
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119 } |