[DynInst_API:] Snippet register get modified by EmitStackAlign

[Xi Chen <xi.chen.chn@xxxxxxxxx>]

Hi,

 I got a situation that Dyninst overwrite register value which generate in my snippet because of the protection of stack and eflag register. Because in the emitStackAlign function (emit-x86.C), it try to align the stack and rax register is used in the middle. so if the snippet which put result into $rax, the value will be modified.Â

 A generated example:Â

Âlea  Â-0x80(%rsp),%rsp

Âpush  %rax

Âlahf

Âseto  %al

Âpush  %rax

Âmov  Â0x655df0,%rax --> the snippet I added.

Âpop  Â%rax

Âadd  Â$0x7f,%al

Âsahf

Âpop  Â%rax

Âlea  Â0x80(%rsp),%rsp

I want to ask if there are any API which I can turn off this trampline code?

Thanks in advance.

--

Best Regards

X.Chen