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custom_jump_call_assembler_with_trampoline

 
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panraven
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Joined: 01 Oct 2008
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PostPosted: Sun Nov 22, 2020 1:12 pm    Post subject: custom_jump_call_assembler_with_trampoline This post has 1 review(s) Reply with quote

Script here
https://pastebin.com/ifrYmpmp

Handle following assembler instruction, to enhance control of immediate jump target (ie. no indirect or register addressing) .
Code:

jmp!         target_address
jmp!short    target_address
jmp!near     target_address
jmp!long     target_address
call!        target_address
call!short   target_address
call!near    target_address
call!long    target_address


The target address should be expected to evaluate to a static address, ie. no [...] format and no register etc.

Without the distance modifier after !, it select the shortest form possible,
else it force near/long if specified and possible. !short is kind of redundancy.

In case of force Near, but the jump distance is greater than 2G,
it will try allocate a trampoline to keep the jump using 5-bytes format.

The trampoline and long jump seems only useful if making an aa script with ONE allocation with multiple inject point in some jit game engine (ie. mono-il-jit).
So unnecessary is this extension, but may provide some convenience.

bye~

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