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Support 32 bit and 64 bit decoding with one binary

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It is possible to configure the build process such that decoding of 32
bit and 64 bit instructions can be chosen at runtime using an additional
parameter of the decode function. The header file is now entirely
architecture-independent and no longer required any previous defines.

Decoding x86-64 still requires a 64-bit pointer size.
This commit is contained in:
Alexis Engelke
2019-01-13 11:58:59 +01:00
parent 83ea2f0769
commit ed53b4a54d
9 changed files with 138 additions and 78 deletions
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README.md
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@@ -1,8 +1,6 @@
# libx86decode
A fast and lightweight decoder for x86 and x86-64. *This is not a disassembler, it does not intend to procude valid assembly.* To meet the goal of speed, lookup tables are used to map the opcode the (internal) description of the instruction encoding. This table currently has a size of roughly 21 kiB.
Currently, decoding 32-bit assembly required the `ARCH_386` macro to be defined and is only tested when compiling as 32-bit binary. Decoding of 64-bit instruction requires the macro `ARCH_X86_64` and is only supported in 64-bit mode. This restriction might change in future.
A fast and lightweight decoder for x86 and x86-64. *This is not a disassembler, it does not intend to produce valid assembly.* To meet the goal of speed, lookup tables are used to map the opcode the (internal) description of the instruction encoding. This table currently has a size of roughly 21 kiB.
### Known issues
- An implicit `FWAIT` in FPU instructions is decoded as a separate instruction. For example, the instruction `FINIT` is decoded as an `FWAIT` followed by an `FINIT` where as `FNINIT` is decoded as a plain `FINIT` instruction.