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Mention pcrel_21/13 & describe jal w/pcrel_21

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John Winans 2020-03-10 11:29:20 -05:00
parent 34ff94a932
commit 4992be5473
1 changed files with 14 additions and 6 deletions
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20
book/rv32/chapter.tex
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@ -5,11 +5,6 @@
\label{chapter:RV32}
\index{RV32}
\section{Introduction}
{\em XXX NOTE: This is a first draft of what is being detailed in the previous chapter}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Conventions and Terminology}
@ -206,6 +201,19 @@ The address of the current instruction plus a numeric offset.
The address of the current instruction minus a numeric offset.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subsection{pcrel\_13}
An address that is within $[-4096..4095]$ of the current instruction location.
These addresses are typically expressed in assembly source code by using labels.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subsection{pcrel\_21}
An address that is within $[-1048576..1048575]$ of the current instruction
location.
These addresses are typically expressed in assembly source code by using labels.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subsection{pc}
@ -454,7 +462,7 @@ capable of expressing a wider range of target addresses than the 20-bit
imm value alone.
\begin{itemize}
\item\instructionHeader{jal\ \ \ rd,imm}
\item\instructionHeader{jal\ \ \ rd,pcrel\_21}
\label{insn:jal}
Set register \verb@rd@ to the address of the next instruction that would