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Author Topic: How to declare couple of bytes in inline assembly?  (Read 812 times)

LemonParty

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How to declare couple of bytes in inline assembly?
« on: March 18, 2025, 02:45:04 pm »
Hello.
I need to declare a couple of bytes in assembly block to replace unrecognized instruction.
Architecture AARCH64.
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Thaddy

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Re: How to declare couple of bytes in inline assembly?
« Reply #1 on: March 18, 2025, 02:46:41 pm »
db ?
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LemonParty

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Re: How to declare couple of bytes in inline assembly?
« Reply #2 on: March 18, 2025, 02:53:51 pm »
"db"
Not work.
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Zvoni

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Re: How to declare couple of bytes in inline assembly?
« Reply #3 on: March 18, 2025, 03:35:28 pm »
Reminds of a WhatsApp-Chat i saw...

User 1: What's this? (Shows a Picture of a USB-C connector)
User 2: Type C
User 1: C
User 1: Doesn't work
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Thaddy

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Re: How to declare couple of bytes in inline assembly?
« Reply #4 on: March 18, 2025, 04:03:24 pm »
Usually this is assembler agnostic:
Code: [Select]
DB 0x90, 0x90, 0x90  // Three Intel NOP instructions in a rowYou should be able to use the same for AARCH64. As long as you know the instruction byte order, that is.

You obviously did not know about the db instruction/directive..
It works, the code example is for intel though.
Fully supported for AARCH64 instructions in byte notation.
« Last Edit: March 18, 2025, 04:17:22 pm by Thaddy »
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LemonParty

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Re: How to declare couple of bytes in inline assembly?
« Reply #5 on: March 18, 2025, 04:21:03 pm »
I found the solution.
Code: ASM  [Select][+][-]
  1. .byte 1,2,3,4
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Thaddy

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Re: How to declare couple of bytes in inline assembly?
« Reply #6 on: March 18, 2025, 04:32:12 pm »
That is the same indeed.
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