From f62de4c3eff32c4f3709d5d690671771fd453701 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Mon, 18 Feb 2019 18:06:24 -0800
Subject: add some notes in README

---
 README.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 README.md

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ce8775d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,17 @@
+## ARM arch notes:
+
+### Register Names
+Reproduced from [infocenter.arm.com](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0473c/CJAJBFHC.html):
+| Name | Maps To | Meaning |
+| ---- | ------- | ------- |
+| r0-r15 | r0-r15 | These are the the registers! |
+| a1-a4 | r0-r3 | Argument, result, or scratch registers |
+| v1-v8 | r4-r11 | Variable registers |
+| sb | r9 | Static base register |
+| fp | r11 | Frame pointer\* |
+| ip | r12 | Intra-procedure call register |
+| sp | r13 | Stack pointer |
+| lr | r14 | link register |
+| pc | r15 | program counter |
+
+\* `fp` does not appear to be explicitly referenced in ARM documentation, and mapping to r11 looks to be OS (Windows/Linux?) convention.
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