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78 lines
2.2 KiB
Markdown
78 lines
2.2 KiB
Markdown
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SIOL - Simple IO Layer
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======================
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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 deprectated, 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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Maps
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----
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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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----------------------
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atm there are 3 diffent 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 referes 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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