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Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64.html | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/arch/arm64.html b/arch/arm64.html index 41e39f3..2b6f813 100644 --- a/arch/arm64.html +++ b/arch/arm64.html @@ -188,6 +188,24 @@ sp_el3 stack pointer EL3 elr_el3 exception link register EL3 spsr_el3 saved process status register EL3 </code></pre> +<h2><a class="header" href="#instructions-cheatsheet" id="instructions-cheatsheet">Instructions cheatsheet</a></h2> +<h3><a class="header" href="#accessing-system-registers" id="accessing-system-registers">Accessing system registers</a></h3> +<p>Reading from system registers:</p> +<pre><code class="language-armasm">mrs x0, vbar_el1 // move vbar_el1 into x0 +</code></pre> +<p>Writing to system registers:</p> +<pre><code class="language-armasm">msr vbar_el1, x0 // move x0 into vbar_el1 +</code></pre> +<h3><a class="header" href="#control-flow" id="control-flow">Control Flow</a></h3> +<pre><code class="language-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 +</code></pre> <h2><a class="header" href="#addressing" id="addressing">Addressing</a></h2> <h3><a class="header" href="#offset" id="offset">Offset</a></h3> <pre><code class="language-armasm">ldr x0, [x1] // x0 = [x1] @@ -336,13 +354,16 @@ greeting_len: Hi ASM-World! </code></pre> <blockquote> -<p>Cross-compiling on <code>Ubuntu 20.04</code>, paths might differ on other distributions. -Compiling natively on arm64, specifying the dynamic linker should not be required.</p> +<p>Cross-compiling on <code>Ubuntu 20.04 (x86_64)</code>, paths might differ on other +distributions. Explicitly specifying the dynamic linker should not be +required when compiling natively on arm64.</p> </blockquote> <h2><a class="header" href="#references" id="references">References</a></h2> <ul> <li><a href="https://github.com/ARM-software/abi-aa/blob/master/aapcs64/aapcs64.rst">Procedure Call Standard ARM64</a></li> -<li><a href="https://developer.arm.com/documentation/den0024/a">ARMv8 Programmer's Guide</a></li> +<li><a href="https://developer.arm.com/documentation/den0024/a">ARMv8-A Programmer's Guide</a></li> +<li><a href="https://developer.arm.com/documentation/ddi0487/latest">ARMv8-A Architecture Reference Manual</a></li> +<li><a href="https://developer.arm.com/documentation/dai0527/a">AppNote: ARMv8 Bare-metal boot code</a></li> <li><a href="https://sourceware.org/binutils/docs/as">GNU Assembler</a></li> <li><a href="https://sourceware.org/binutils/docs/as/Pseudo-Ops.html#Pseudo-Ops">GNU Assembler Directives</a></li> </ul> |