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Compress the size of the register use/ABI table

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John Winans 2021-02-11 14:16:21 -06:00
parent 49289fcbfa
commit 67ea29c8d9
1 changed files with 15 additions and 34 deletions
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49
book/rv32/chapter.tex
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@ -1040,7 +1040,7 @@ If \verb@rs1@ is not equal to \verb@rs2@ then add \verb@imm_b@ to the
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subsection{CPU Registers}
\section{CPU Registers}
\label{cpuregs}
The registers are names x0 through x31 and have aliases suited to their
@ -1065,41 +1065,22 @@ in the compressed format.
\begin{center}
\begin{tabular}{|l|l|l|l|}
\hline
Reg & Alias & Description & Saved \\
Reg & ABI/Alias & Description & Saved \\
\hline
\hline
x0 & zero & Hard-wired zero & \\
x1 & ra & Return address & \\
x2 & sp & Stack pointer & yes \\
x3 & gp & Global pointer & \\
x4 & tp & Thread pointer & \\
x5 & t0 & Temporary/alternate link register & \\
x6 & t1 & Temporary & \\
x7 & t2 & Temporary & \\
x8 & s0/fp & Saved register/frame pointer & yes \\
x9 & s1 & Saved register & yes \\
x10 & a0 & Function argument/return value & \\
x11 & a1 & Function argument/return value & \\
x12 & a2 & Function argument & \\
x13 & a3 & Function argument & \\
x14 & a4 & Function argument & \\
x15 & a5 & Function argument & \\
x16 & a6 & Function argument & \\
x17 & a7 & Function argument & \\
x18 & s2 & Saved register & yes \\
x19 & s3 & Saved register & yes \\
x20 & s4 & Saved register & yes \\
x21 & s5 & Saved register & yes \\
x22 & s6 & Saved register & yes \\
x23 & s7 & Saved register & yes \\
x24 & s8 & Saved register & yes \\
x25 & s9 & Saved register & yes \\
x26 & s10 & Saved register & yes \\
x27 & s11 & Saved register & yes \\
x28 & t3 & Temporary & \\
x29 & t4 & Temporary & \\
x30 & t5 & Temporary & \\
x31 & t6 & Temporary & \\
\verb@x0@ & \verb@zero@ & Hard-wired zero & \\
\verb@x1@ & \verb@ra@ & Return address & \\
\verb@x2@ & \verb@sp@ & Stack pointer & yes \\
\verb@x3@ & \verb@gp@ & Global pointer & \\
\verb@x4@ & \verb@tp@ & Thread pointer & \\
\verb@x5@ & \verb@t0@ & Temporary/alternate link register & \\
\verb@x6-7@ & \verb@t1-2@ & Temporaries & \\
\verb@x8@ & \verb@s0/fp@ & Saved register/frame pointer & yes \\
\verb@x9@ & \verb@s1@ & Saved register & yes \\
\verb@x10-11@ & \verb@a0-1@ & Function arguments/return value & \\
\verb@x12-17@ & \verb@a2-7@ & Function arguments & \\
\verb@x18-27@ & \verb@s2-11@ & Saved registers & yes \\
\verb@x28-31@ & \verb@t3-6@ & Temporaries & \\
\hline
\end{tabular}
\end{center}