Expand description of registers and their uses

riscv-non-isa / riscv-asm-manual

RISC-V Assembly Programmer's Manual

https://jira.riscv.org/browse/RVG-4

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Expand description of registers and their uses #76

Open scotws opened 2 years ago

scotws commented 2 years ago

Distinguish between the x-register view and the ABI used by the programmer; include "RV32E" as reason for strange distribution of register ABI. Minor formatting changes.

kito-cheng commented 2 years ago

Generally LGTM, @aswaterman do you mind having a final review for that?