2 AcessOS 1 - Dynamic Loader
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9 // === PROTOTYPES ===
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10 void *DoRelocate(void *base, char **envp, const char *Filename);
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11 int CallUser(void *Entry, void *SP);
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14 extern char gLinkedBase[];
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15 extern tLoadedLib gLoadedLibraries[];
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17 extern int memcmp(const void *m1, const void *m2, size_t size);
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21 \fn int SoMain(Uint base, int argc, char *argv[], char **envp)
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22 \brief Library entry point
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23 \note This is the entrypoint for the library
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25 void *SoMain(void *base, int argc, char **argv, char **envp)
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31 // - Assume that the file pointer will be less than 4096
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32 if((intptr_t)base < 0x1000) {
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33 SysDebug("ld-acess - SoMain: Passed file pointer %i\n", base);
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37 // Check if we are being called directly
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38 if(base == &gLinkedBase) {
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39 SysDebug("ld-acess should not be directly called\n");
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44 gLoadedLibraries[0].Base = &gLinkedBase;
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45 // 'libld-acess.so' because that is what applications link against
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46 gLoadedLibraries[0].Name = "/Acess/Libs/libld-acess.so";
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48 // Otherwise do relocations
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49 //ret = DoRelocate( base, envp, "Executable" );
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50 ret = DoRelocate( base, NULL, "Executable" );
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52 SysDebug("ld-acess - SoMain: Relocate failed, base=0x%x\n", base);
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57 SysDebug("ld-acess - SoMain: ret = %p", ret);
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62 \fn int DoRelocate(void *base, char **envp)
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63 \brief Relocates an in-memory image
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65 void *DoRelocate(void *base, char **envp, const char *Filename)
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67 uint8_t *hdr = base;
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69 if(memcmp(base, "\x7F""ELF", 4) == 0)
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70 return ElfRelocate(base, envp, Filename);
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71 if(hdr[0] == 0x7F && hdr[1] == 'E' && hdr[2] == 'L' && hdr[3] == 'F')
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72 return ElfRelocate(base, envp, Filename);
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74 if(hdr[0] == 'M' && hdr[1] == 'Z')
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75 return PE_Relocate(base, envp, Filename);
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77 SysDebug("ld-acess - DoRelocate: Unkown file format '0x%x 0x%x 0x%x 0x%x'\n",
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78 hdr[0], hdr[1], hdr[2], hdr[3] );
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79 SysDebug("ld-acess - DoRelocate: File '%s'\n", Filename);
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85 \fn int CallUser(Uint entry, Uint sp)
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87 int CallUser(void *entry, void *sp)
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89 #if ARCHDIR_IS_x86_64
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90 ((void **)sp)[-1] = 0; // Clear return address
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91 __asm__ __volatile__ (
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92 "mov %%rax, %%rsp;\n\t"
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94 : : "a"(sp), "c"(entry));
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95 #elif ARCHDIR_IS_x86
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96 ((void **)sp)[-1] = 0; // Clear return address
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97 __asm__ __volatile__ (
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98 "mov %%eax, %%esp;\n\t"
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100 : : "a"(sp), "c"(entry));
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