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50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
#ifndef COSMOPOLITAN_APE_RELOCATIONS_H_
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#define COSMOPOLITAN_APE_RELOCATIONS_H_
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/*─────────────────────────────────────────────────────────────────────────────╗
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│ αcτµαlly pδrταblε εxεcµταblε § relocations │
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╚──────────────────────────────────────────────────────────────────────────────╝
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One of the things αcτµαlly pδrταblε εxεcµταblε does a good job
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abstracting, is how a program needs to exist at three addresses
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simultaneously during the early stages of the loading process.
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By default, the linker calculates all symbols using virtual addresses.
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In some cases it's necessary to use addend macros that change virtual
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addresses into the other two types: physical and real. */
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#define IMAGE_BASE_REAL 0x2000
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#ifndef IMAGE_BASE_VIRTUAL
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#define IMAGE_BASE_VIRTUAL 0x400000
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#endif
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#ifndef IMAGE_BASE_PHYSICAL
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#define IMAGE_BASE_PHYSICAL 0x100000
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#endif
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/**
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* Returns Relative Virtual Address.
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*/
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#define RVA(x) ((x) - (IMAGE_BASE_VIRTUAL))
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/**
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* Adjusts virtual address so it's relative to load address.
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*/
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#define PHYSICAL(x) ((x) - (IMAGE_BASE_VIRTUAL - IMAGE_BASE_PHYSICAL))
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/**
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* Makes high-entropy read-only addresses relocatable in real mode.
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*/
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#define REAL(x) ((x) - (IMAGE_BASE_VIRTUAL - IMAGE_BASE_REAL))
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#if IMAGE_BASE_VIRTUAL % 0x1000 != 0
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#error "IMAGE_BASE_VIRTUAL must be 4kb aligned"
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#endif
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#if IMAGE_BASE_PHYSICAL % 0x1000 != 0
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#error "IMAGE_BASE_PHYSICAL must be 4kb aligned"
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#endif
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#if IMAGE_BASE_REAL % 0x1000 != 0
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#error "IMAGE_BASE_REAL must be 4kb aligned"
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#endif
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#endif /* COSMOPOLITAN_APE_RELOCATIONS_H_ */
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