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ESIL(7) FreeBSD Miscellaneous Information Manual ESIL(7)

ESIL - Evaluable Strings Intermediate Language

ESIL aims to describe a Forth-like representation for every target CPU opcode semantics. ESIL representations can be evaluated (interpreted) in order to emulate individual instructions.

Each command of an ESIL expression is separated by a comma
<source0>,<source1>,<operation>
<source>,<destination>,<operation>
<source_destination>,<operation>

These operations should be enough to emulate most instructions of any architecture
=
sets the value of the destination to the value of the source
+
adds the values of source0 and source1 and pushes the result on the esil stack
-
subtracts the value of source0 from the value of source1 and pushes the result on the esil stack
*
multiplies the values of source0 and source1 and pushes the result on the esil stack
/
divides the value of source1 by the value of source0

jmp eax -> eax,eip,=

radare2(1)

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