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-rw-r--r--lib/arch/arm/README.md11
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diff --git a/lib/arch/arm/README.md b/lib/arch/arm/README.md
index 8631c93..83675a9 100644
--- a/lib/arch/arm/README.md
+++ b/lib/arch/arm/README.md
@@ -1,9 +1,12 @@
-# Procedure Call Standard ARM64
+# ARM (aapcs32)
+Provide an implementation of the platform specific API as required in
+[`api.h`](../api.h) according to the `ARM Procedure Call Standard (aapcs32)`.
+## Notes: Procedure Call Standard ARM (aapcs32)
- Integer/pointer arguments via `r0`-`r3`
- Integer/pointer return values via `r0`
-- Callee saved registers `r4`-`r11`, `sp`, `lr`, `fp`
+- Callee saved registers `r4`-`r11`, `sp`
-## Reference
+## References
- [johannst armv7 notes](https://johannst.github.io/notes/arch/armv7.html)
-
+- [Procedure Call Standard aapcs32](https://github.com/ARM-software/abi-aa/blob/master/aapcs32/aapcs32.rst)