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| -rw-r--r-- | src/arch/arm64.md | 25 |
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diff --git a/src/arch/arm64.md b/src/arch/arm64.md index 1bf76b4..68c4bfa 100644 --- a/src/arch/arm64.md +++ b/src/arch/arm64.md @@ -40,6 +40,31 @@ elr_el3 exception link register EL3 spsr_el3 saved process status register EL3 ``` +## Instructions cheatsheet + +### Accessing system registers +Reading from system registers: +```armasm +mrs x0, vbar_el1 // move vbar_el1 into x0 +``` + +Writing to system registers: +```armasm +msr vbar_el1, x0 // move x0 into vbar_el1 +``` + +### Control Flow +```armasm +b <offset> // relative forward/back branch +br <Xn> // absolute branch to address in register Xn + +// branch & link, store return address in X30 (LR) +bl <offset> // relative forward/back branch +blr <Xn> // absolute branch to address in register Xn + +ret {Xn} // return to address in X30, or Xn if supplied +``` + ## Addressing ### Offset ```armasm |