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Rev | Author | Line No. | Line |
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3014 | dunkaist | 1 | ;----------------------------------------------------------------------------- |
6823 | siemargl | 2 | ; load one or more DLL file in COFF format and try to import functions by our list |
3 | ; if first function in import list begins with 'lib_', call it as DLL initialization |
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4 | ; return eax = 1 as fail, if anyone of .obj file not found in /sys/lib |
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5 | ; return 0 if all fine, but 0 not garantees in succesfull import - see dll.Link comment |
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6 | ; dirties all registers! eax, ebx, ecx, edx, esi, edi |
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3014 | dunkaist | 7 | proc dll.Load, import_table:dword |
8 | mov esi, [import_table] |
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9 | .next_lib: |
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10 | mov edx, [esi] |
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11 | or edx, edx |
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12 | jz .exit |
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13 | push esi |
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14 | mov esi, [esi + 4] |
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15 | mov edi, s_libdir.fname |
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16 | @@: |
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17 | lodsb |
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18 | stosb |
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19 | or al, al |
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20 | jnz @b |
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21 | mcall 68, 19, s_libdir |
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22 | or eax, eax |
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23 | jz .fail |
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24 | stdcall dll.Link, eax, edx |
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3038 | dunkaist | 25 | push eax |
26 | mov eax, [eax] |
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27 | cmp dword[eax], 'lib_' |
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28 | pop eax |
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29 | jnz @f |
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3014 | dunkaist | 30 | stdcall dll.Init, [eax + 4] |
3038 | dunkaist | 31 | @@: |
3014 | dunkaist | 32 | pop esi |
33 | add esi, 8 |
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34 | jmp .next_lib |
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35 | .exit: |
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36 | xor eax, eax |
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37 | ret |
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38 | .fail: |
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39 | add esp, 4 |
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40 | xor eax, eax |
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41 | inc eax |
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42 | ret |
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43 | endp |
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44 | ;----------------------------------------------------------------------------- |
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6823 | siemargl | 45 | ; scans dll export table for a functions we want to import |
46 | ; break scan on first unresolved import |
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47 | ; no return value |
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3014 | dunkaist | 48 | proc dll.Link, exp:dword, imp:dword |
49 | push eax |
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50 | mov esi, [imp] |
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51 | test esi, esi |
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52 | jz .done |
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53 | .next: |
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54 | lodsd |
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55 | test eax, eax |
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56 | jz .done |
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57 | stdcall dll.GetProcAddress, [exp], eax |
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58 | or eax, eax |
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59 | jz @f |
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60 | mov [esi - 4], eax |
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61 | jmp .next |
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62 | @@: |
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63 | mov dword[esp], 0 |
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64 | .done: |
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65 | pop eax |
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66 | ret |
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67 | endp |
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68 | ;----------------------------------------------------------------------------- |
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6823 | siemargl | 69 | ; calls lib_init with predefined parameters |
70 | ; no return value |
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3014 | dunkaist | 71 | proc dll.Init, dllentry:dword |
72 | pushad |
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73 | mov eax, mem.Alloc |
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74 | mov ebx, mem.Free |
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75 | mov ecx, mem.ReAlloc |
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76 | mov edx, dll.Load |
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77 | stdcall [dllentry] |
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78 | popad |
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79 | ret |
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80 | endp |
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81 | ;----------------------------------------------------------------------------- |
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6823 | siemargl | 82 | ; scans export table for a sz_name function |
83 | ; returns in eax function address or 0 if not found |
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3014 | dunkaist | 84 | proc dll.GetProcAddress, exp:dword, sz_name:dword |
85 | mov edx, [exp] |
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86 | xor eax, eax |
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87 | .next: |
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88 | or edx, edx |
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89 | jz .end |
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90 | cmp dword[edx], 0 |
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91 | jz .end |
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92 | stdcall strcmp, [edx], [sz_name] |
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93 | test eax, eax |
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94 | jz .ok |
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95 | add edx, 8 |
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96 | jmp .next |
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97 | .ok: |
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98 | mov eax, [edx + 4] |
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99 | .end: |
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6823 | siemargl | 100 | cmp eax, -1 |
101 | jnz @f |
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102 | xor eax, eax |
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103 | @@: |
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3014 | dunkaist | 104 | ret |
105 | endp |
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106 | ;----------------------------------------------------------------------------- |
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6823 | siemargl | 107 | ; compares strings |
108 | ; returns eax = 0 if equal, -1 otherwise |
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3014 | dunkaist | 109 | proc strcmp, str1:dword, str2:dword |
110 | push esi edi |
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111 | mov esi, [str1] |
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112 | mov edi, [str2] |
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113 | xor eax, eax |
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114 | @@: |
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115 | lodsb |
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116 | scasb |
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117 | jne .fail |
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118 | or al, al |
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119 | jnz @b |
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120 | jmp .ok |
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121 | .fail: |
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122 | or eax, -1 |
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123 | .ok: |
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124 | pop edi esi |
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125 | ret |
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126 | endp |
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127 | ;----------------------------------------------------------------------------- |
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2619 | mario79 | 128 | s_libdir: |
129 | db '/sys/lib/' |
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3014 | dunkaist | 130 | .fname rb 32 |
131 | ;----------------------------------------------------------------------------- |
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132 | proc mem.Alloc, size |
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133 | push ebx ecx |
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134 | mov ecx, [size] |
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135 | mcall 68, 12 |
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136 | pop ecx ebx |
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137 | ret |
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138 | endp |
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139 | ;----------------------------------------------------------------------------- |
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140 | proc mem.ReAlloc, mptr, size |
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141 | push ebx ecx edx |
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142 | mov ecx, [size] |
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143 | mov edx, [mptr] |
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144 | mcall 68, 20 |
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145 | pop edx ecx ebx |
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146 | ret |
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147 | endp |
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148 | ;----------------------------------------------------------------------------- |
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149 | proc mem.Free, mptr |
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150 | push ebx ecx |
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151 | mov ecx,[mptr] |
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152 | mcall 68, 13 |
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153 | pop ecx ebx |
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154 | ret |
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155 | endp |
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156 | ;----------------------------------------------------------------------------- |