From 05adb3d0c9f47302d906290ecd304aab1814cba3 Mon Sep 17 00:00:00 2001
From: Garritt McCune <glmccune@gmail.com>
Date: Tue, 10 Sep 2024 23:29:43 -0500
Subject: [PATCH] Added a few more instructions.

---
 chapter 2.tex | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/chapter 2.tex b/chapter 2.tex
index 8317e42..7791437 100644
--- a/chapter 2.tex	
+++ b/chapter 2.tex	
@@ -401,4 +401,64 @@ The /r represents a byte that specifies a register. /immX is for the immediate d
 		\hline
 	\end{tabularx}
 	\paragraph{Description} Registers a 1024 byte block of memory starting at \textit{operand one} as the Interrupt Vector Table.
+	\paragraph{Flags Affected} None.
+\subsection{PUSHA}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		19 & pusha & None & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Pushes all general purpose registers to the stack in order starting from \textit{r1} to \textit{r8}.
+	\paragraph{Flags Affected} None.
+\subsection{POPA}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		20 & popa & None & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Pops all general purpose registers from the stack, restoring them, in the reverse order of \textit{r8} to \textit{r1}.
+	\paragraph{Flags Affected} None.
+\subsection{CALL}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		21 & call & None & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Calls a subroutine pushing the Program Counter (PC), plus one to return execution to the next opcode, to the stack.
+	\paragraph{Flags Affected} None.
+\subsection{RET}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		22 & ret & None & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Returns from the subroutine, popping the stack to restore the return address into the Program Counter (PC).
+	\paragraph{Flags Affected} None.
+\subsection{PUSH}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		23 & push /r & /r & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Pushes the contents of register \textit{Operand One} onto the top of the stack.
+	\paragraph{Flags Affected} None.
+\subsection{POP}
+	\begin{tabularx}{\textwidth}{ | c | X | c | c | }
+		\hline
+		Opcode & Instruction & Operand One & Operand Two \\
+		\hline
+		24 & pop /r & /r & None \\
+		\hline
+	\end{tabularx}
+	\paragraph{Description} Pops 32-bits from the top of the stack into the register \textit{Operand One}.
 	\paragraph{Flags Affected} None.
\ No newline at end of file