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77 lines
2.1 KiB
Markdown
77 lines
2.1 KiB
Markdown
# SIOL - Simple IO Layer
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## Top-Down-View of siol
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```
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+==================+
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| Write-Mask |
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+==================+
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| Buffer | <--- maybe this could be deprecated, I see no usecase for the buffer
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+==================+
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| Cache (V) |
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+==================+ +========================+
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| Maps | <=== | Sections (transformed) |
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+==================+ +========================+
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| Descs |
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| +===========+
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| | Cache (P) |
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+======+===========+
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| Plugin |
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+==================+
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```
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## Maps
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Every map has a mapid which is a unique identifier. Code from the outside of RIO shall use this id instead of a pointer. This may cost performance, but pointers can hurt you.
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Mapping information in the map:
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* from
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* to
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* delta
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* fd
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## Section Transformation
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At the moment there are 3 different transformation-targets:
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* Hexeditor
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* Analysis
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* Emulation
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Mapping information in the section:
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* addr
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* size
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* vaddr
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* vsize
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* fd
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A section can be related to 2 maps:
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* memmap
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* filemap
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Hexeditor-Transformation:
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* check if addr != vaddr, if so continue
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* create a map with the size of min (size, vsize), that maps the to fd corresponding desc to vaddr, starting at addr
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* filemap is set to the id of the map
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* memmap stays 0
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Analysis-Transformation:
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* when vsize <= size perform Hexeditor-Transformation, and you're done
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* create a map with the size of size, that the to fd corresponding vaddr, starting at addr
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* filemap is set to the id of the map
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* open a new desc, using the null-plugin, with the size of vsize - size
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* create another map with the size of vsize - size, that maps the new desc to vaddr + size, starting at 0x0
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* memmap is set to the id of the second map
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Emulation-Transformation:
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* when the section does not allow write-access perform Analysis-Transformation, and you're done
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* open a new desc with write-permissions, using the malloc-plugin, with the size of vsize
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* copy min (size, vsize) bytes fram the desc, that fd refers to, starting at addr, to the new desc, starting at 0x0
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* create a map with the size of vsize, that maps the new desc to vaddr, starting at 0x0
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