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2995 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup rtld rtld |
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30 | * @brief |
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31 | * @{ |
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32 | */ |
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33 | /** |
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34 | * @file |
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35 | */ |
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36 | |||
37 | #include <elf_dyn.h> |
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38 | #include <rtld.h> |
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3401 | svoboda | 39 | #include <loader/pcb.h> |
2995 | svoboda | 40 | |
41 | // for testing printf |
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42 | #include <stdio.h> |
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43 | |||
3401 | svoboda | 44 | void __main(pcb_t *pcb); |
45 | //void __io_init(void); |
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2995 | svoboda | 46 | void __exit(void); |
47 | |||
48 | static void kputint(unsigned i) |
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49 | { |
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3554 | svoboda | 50 | /* asm volatile ( |
2995 | svoboda | 51 | "mr %%r3, %0\n" |
3004 | svoboda | 52 | "li %%r9, 31\n" |
2995 | svoboda | 53 | "sc\n" |
54 | : |
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55 | : "r" (i) |
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56 | : "%r3","%r9" |
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3554 | svoboda | 57 | ) ;*/ |
2995 | svoboda | 58 | } |
59 | |||
60 | #define __L(ptr) ((uint32_t)(ptr) & 0x0000ffff) |
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61 | #define __HA(ptr) ((uint32_t)(ptr) >> 16) |
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62 | |||
63 | // ldis r11, .PLTtable@ha |
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64 | static inline uint32_t _ldis(unsigned rD, uint16_t imm16) |
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65 | { |
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66 | /* Special case of addis: ldis rD,SIMM == addis rD,0,SIMM */ |
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67 | return 0x3C000000 | (rD << 21) | imm16; |
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68 | } |
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69 | |||
70 | static inline uint32_t _lwz(unsigned rD, uint16_t disp16, unsigned rA) |
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71 | { |
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72 | return 0x80000000 | (rD << 21) | (rA << 16) | disp16; |
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73 | } |
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74 | |||
75 | static inline uint32_t _mtctr(unsigned rS) |
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76 | { |
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77 | /* mtctr rD == mtspr 9, rD */ |
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78 | return 0x7c0003a6 | (rS << 21) | (9/*CTR*/ << 16); |
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79 | } |
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80 | |||
81 | static inline uint32_t _bctr() |
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82 | { |
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83 | /* bcctr 0x1f, 0 */ |
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84 | return 0x4c000420 | (0x1f/*always*/ << 21); |
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85 | } |
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86 | |||
87 | /* branch */ |
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88 | static inline uint32_t _b(uint32_t *addr, uint32_t *location) |
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89 | { |
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90 | uint32_t raddr = ((uint32_t)addr - (uint32_t)location) & 0x03fffffc; |
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91 | return 0x48000000 | raddr; |
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92 | } |
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93 | |||
94 | void test_func(void) |
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95 | { |
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96 | kputint(-1); |
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97 | kputint(42); |
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98 | kputint(-1); |
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99 | } |
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100 | |||
2997 | svoboda | 101 | int test_var = 0x818283; |
102 | |||
3401 | svoboda | 103 | void __bootstrap(pcb_t *pcb); |
2995 | svoboda | 104 | |
3401 | svoboda | 105 | void __bootstrap(pcb_t *pcb) |
2995 | svoboda | 106 | { |
107 | unsigned bias; |
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108 | uint32_t *plt; |
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109 | elf_dyn_t *dynamic; |
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110 | void *dptr; |
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111 | unsigned dval; |
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112 | int i; |
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113 | |||
114 | size_t rel_entries; |
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115 | size_t r_offset; |
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116 | elf_word r_info; |
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117 | unsigned rel_type; |
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118 | elf_word sym_idx; |
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119 | uintptr_t sym_addr; |
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120 | |||
121 | elf_symbol_t *sym_table; |
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122 | elf_rela_t *rel_table; |
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123 | elf_rela_t *jmp_rel_table; |
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124 | size_t jmp_rel_entries; |
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125 | uint32_t a, res; |
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126 | uint32_t *r_ptr; |
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127 | uint32_t *_plt_ent; |
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128 | |||
129 | kputint(42); |
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130 | |||
131 | /* The program loader (iloader) kindly provided us with these */ |
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132 | dynamic = pcb->rtld_dynamic; |
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133 | bias = pcb->rtld_bias; |
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134 | |||
135 | kputint(bias); |
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136 | kputint((unsigned)dynamic); |
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137 | |||
138 | /* parse DYNAMIC */ |
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139 | plt = 0; |
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140 | sym_table = 0; |
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141 | rel_table = 0; |
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142 | rel_entries = 0; |
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143 | jmp_rel_table = 0; |
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144 | jmp_rel_entries = 0; |
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3554 | svoboda | 145 | /* |
2995 | svoboda | 146 | i = 0; |
147 | while (dynamic[i].d_tag != 0) { |
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148 | // kputint((uintptr_t)&dynamic[i]); |
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149 | // kputint((uintptr_t)&(dynamic[i].d_tag)); |
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150 | // kputint(dynamic[i].d_tag); |
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151 | |||
152 | dptr = (void *)(dynamic[i].d_un.d_val + bias); |
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153 | dval = dynamic[i].d_un.d_val; |
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154 | |||
155 | // kputint(0x10); |
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156 | register unsigned tag = dynamic[i].d_tag; |
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3554 | svoboda | 157 | */ |
2995 | svoboda | 158 | /* |
159 | * Note that switches only work because we are using |
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160 | * -fno-jump-tables. |
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161 | */ |
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3554 | svoboda | 162 | /* switch (tag) { |
2996 | svoboda | 163 | case DT_PLTRELSZ: jmp_rel_entries = dval/sizeof(elf_rela_t); break; |
2995 | svoboda | 164 | case DT_JMPREL: jmp_rel_table = dptr; break; |
3554 | svoboda | 165 | case DT_PLTGOT:*/ |
2995 | svoboda | 166 | /* PLT address */ |
3554 | svoboda | 167 | /* plt = dptr; break; |
2995 | svoboda | 168 | case DT_SYMTAB: sym_table = dptr; break; |
169 | case DT_RELA: rel_table = dptr; break; |
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2996 | svoboda | 170 | case DT_RELASZ: rel_entries = dval / sizeof(elf_rela_t); break; |
2995 | svoboda | 171 | default: break; |
172 | } |
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3554 | svoboda | 173 | */ |
2995 | svoboda | 174 | // kputint(0x20); |
3554 | svoboda | 175 | /* |
2995 | svoboda | 176 | ++i; |
177 | } |
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178 | |||
179 | kputint(1); |
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180 | kputint((unsigned)sym_table); |
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181 | kputint((unsigned)rel_table); |
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182 | kputint((unsigned)rel_entries); |
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183 | |||
3554 | svoboda | 184 | */ /* Now relocate all our dynsyms */ |
2995 | svoboda | 185 | kputint(-1); |
186 | |||
187 | // PLT entries start here. However, each occupies 2 words |
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3554 | svoboda | 188 | // _plt_ent = plt + 18; |
2995 | svoboda | 189 | |
190 | // By definition of the ppc ABI, there's 1:1 correspondence |
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191 | // between JMPREL entries and PLT entries |
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3554 | svoboda | 192 | // unsigned plt_n = jmp_rel_entries; |
193 | /* |
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2995 | svoboda | 194 | uint32_t *_plt_table; |
195 | uint32_t *_plt_call; |
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196 | uint32_t *_plt_resolve; |
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197 | |||
198 | _plt_resolve = plt; |
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199 | _plt_call = plt + 6; |
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200 | _plt_table = plt + 18 + plt_n; |
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201 | |||
202 | for (i=0; i<rel_entries; i++) { |
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203 | // kputint(i); |
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204 | r_offset = rel_table[i].r_offset; |
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205 | r_info = rel_table[i].r_info; |
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206 | r_ptr = (uint32_t *)(r_offset + bias); |
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207 | a = rel_table[i].r_addend; |
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208 | // kputint(-2); |
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209 | // kputint(a); |
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210 | // kputint(ELF32_R_TYPE(r_info)); |
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211 | // kputint(ELF32_R_SYM(r_info)); |
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212 | |||
213 | rel_type = ELF32_R_TYPE(r_info); |
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214 | |||
215 | // kputint(rel_type); |
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216 | // kputint(r_offset); |
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217 | |||
218 | switch (rel_type) { |
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219 | case R_PPC_JMP_SLOT: |
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2997 | svoboda | 220 | // kputint(0xa); |
2995 | svoboda | 221 | sym_idx = ELF32_R_SYM(r_info); |
222 | |||
223 | sym_addr = sym_table[sym_idx].st_value + bias; |
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2997 | svoboda | 224 | // kputint(sym_idx); |
225 | // kputint(sym_addr); |
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2995 | svoboda | 226 | |
227 | // r_ptr should point to a plt entry... |
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228 | uint32_t pidx = (r_ptr - _plt_ent) / 2; |
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229 | if (pidx >= plt_n) { |
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2998 | svoboda | 230 | kputint(0xee00ee00); |
2997 | svoboda | 231 | while(1); |
2995 | svoboda | 232 | } |
2997 | svoboda | 233 | // _plt_table[pidx] = sym_addr; |
2995 | svoboda | 234 | // kputint(pidx); |
2998 | svoboda | 235 | plt[18+2*pidx] = _b((void *)sym_addr, &plt[18+2*pidx]); |
2995 | svoboda | 236 | // kputint(&plt[18]); |
237 | // kputint(plt[18]); |
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238 | // while(1); |
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239 | // while(1); |
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3554 | svoboda | 240 | // *r_ptr = sym_addr; |
2997 | svoboda | 241 | |
2995 | svoboda | 242 | break; |
243 | |||
244 | case R_PPC_ADDR32: |
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245 | kputint(0xb); |
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246 | sym_idx = ELF32_R_SYM(r_info); |
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247 | |||
248 | sym_addr = sym_table[sym_idx].st_value + bias; |
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249 | kputint(sym_idx); |
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250 | kputint(sym_addr); |
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251 | |||
252 | *r_ptr = a + sym_addr; |
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253 | break; |
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254 | |||
255 | case R_PPC_RELATIVE: |
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2997 | svoboda | 256 | kputint(0xc); |
2995 | svoboda | 257 | *r_ptr = a + bias; |
258 | break; |
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259 | |||
260 | case R_PPC_REL24: |
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261 | kputint(0xd); |
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262 | sym_idx = ELF32_R_SYM(r_info); |
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263 | sym_addr = sym_table[sym_idx].st_value + bias; |
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264 | kputint(sym_addr); |
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265 | res = (sym_addr - (uint32_t)r_ptr + a) >> 2; |
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266 | kputint(res); |
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3554 | svoboda | 267 | if (res & 0xff000000) {*/ |
2995 | svoboda | 268 | /* out of range?? */ |
3554 | svoboda | 269 | /* kputint(0xeeeeeeee); |
2995 | svoboda | 270 | //while(1); |
271 | } |
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272 | *r_ptr = (*r_ptr & ~0x00ffffff) | (res & 0x00ffffff); |
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273 | kputint(0x1d); |
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274 | break; |
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275 | } |
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276 | } |
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3554 | svoboda | 277 | */ |
2995 | svoboda | 278 | kputint(-3); |
3554 | svoboda | 279 | // if (plt != 0) { |
2995 | svoboda | 280 | |
281 | /* .PLTcall: */ |
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3554 | svoboda | 282 | // plt[6] = _ldis(11, __HA(_plt_table)); // ldis r11, .PLTtable@ha |
283 | // plt[7] = _lwz(11, __L(_plt_table), 11); // lwz r11, .PLTtable@l(r11) |
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284 | // plt[8] = _mtctr(11); // mtctr r11 |
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285 | // plt[9] = _bctr(); |
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2995 | svoboda | 286 | |
287 | /* .PLTi, i = 0..N-1 */ |
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2997 | svoboda | 288 | /* kputint(-4); |
2995 | svoboda | 289 | for (i = 0; i < plt_n; ++i) { |
290 | //_plt_table[i] == function address; |
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291 | plt[18+i] = _b(_plt_call, &plt[18+i]); // b .PLTcall |
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292 | } |
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2997 | svoboda | 293 | */ |
3554 | svoboda | 294 | // kputint(-5); |
295 | // kputint(_plt_table[0]); |
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296 | // } |
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2995 | svoboda | 297 | |
3554 | svoboda | 298 | // kputint(-6); |
2995 | svoboda | 299 | /* This will come in handy */ |
3554 | svoboda | 300 | // runtime_env.rtld_dynamic = dynamic; |
301 | // runtime_env.rtld.bias = bias; |
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2995 | svoboda | 302 | |
303 | // volatile int ff=1; |
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304 | // while(ff); |
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2997 | svoboda | 305 | kputint(-7); |
2995 | svoboda | 306 | test_func(); |
307 | kputint(0x42); |
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2997 | svoboda | 308 | kputint(test_var); |
2995 | svoboda | 309 | // while(1); |
2997 | svoboda | 310 | // while(1); |
2995 | svoboda | 311 | /* Init libc and run rtld main */ |
312 | kputint(0x22); |
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3401 | svoboda | 313 | __main(pcb); |
2995 | svoboda | 314 | |
3401 | svoboda | 315 | // kputint(33); |
316 | // __io_init(); |
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2995 | svoboda | 317 | kputint(-1); |
318 | kputint(0x52); |
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2996 | svoboda | 319 | // printf("Hello, world! (from ppc rtld)\n"); |
2995 | svoboda | 320 | kputint(0x62); |
2996 | svoboda | 321 | // while(1); |
322 | kputint(34); |
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323 | _rtld_main(); |
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324 | kputint(35); |
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325 | __exit(); |
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2995 | svoboda | 326 | |
2996 | svoboda | 327 | kputint(36); |
2995 | svoboda | 328 | } |
329 | |||
330 | /** @} |
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331 | */ |