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docs/DSP: Add RTIcc

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Pokechu22 2021-08-16 00:03:15 -07:00
parent 5611bd8f23
commit 1b84721b7f
1 changed files with 30 additions and 2 deletions
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32
docs/DSP/GameCube_DSP_Users_Manual/GameCube_DSP_Users_Manual.tex
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@ -1030,7 +1030,7 @@ Opcode decoding uses special naming for bits and their decimal representations t
\section{Conditional opcodes} \section{Conditional opcodes}
Conditional opcodes are executed only when the condition described by their encoded conditional field has been met. Conditional opcodes are executed only when the condition described by their encoded conditional field has been met.
The groups of conditional instructions are: \Opcode{CALLcc}, \Opcode{Jcc}, \Opcode{IFcc}, \Opcode{RETcc}, \Opcode{JRcc}, and \Opcode{CALLRcc}. The groups of conditional instructions are: \Opcode{CALLcc}, \Opcode{Jcc}, \Opcode{IFcc}, \Opcode{RETcc}, \Opcode{RTIcc}, \Opcode{JRcc}, and \Opcode{CALLRcc}.
\begin{table}[H] \begin{table}[H]
\centering \centering
@ -3720,6 +3720,34 @@ A ``-'' indicates that the flag retains its previous value, a ``0'' indicates th
\DSPOpcodeFlagsUnchanged \DSPOpcodeFlagsUnchanged
\end{DSPOpcode} \end{DSPOpcode}
\begin{DSPOpcode}{RTIcc}
\begin{DSPOpcodeBytefield}{16}
\monobitbox{4}{0000} & \monobitbox{4}{0010} & \monobitbox{4}{1111} & \monobitbox{4}{cccc}
\end{DSPOpcodeBytefield}
\begin{DSPOpcodeFormat}
RTIcc
\end{DSPOpcodeFormat}
\begin{DSPOpcodeDescription}
\item Return from exception if condition \Flag{cc} has been met. Pops stored status register \Register{\$sr} from data stack \Register{\$st1} and
program counter PC from call stack \Register{\$st0} and sets \Register{\$pc} to this location.
\end{DSPOpcodeDescription}
\begin{DSPOpcodeOperation}
IF (cc)
$sr = $st1
POP_STACK($st1)
$pc = $st0
POP_STACK($st0)
ELSE
$pc++
ENDIF
\end{DSPOpcodeOperation}
\DSPOpcodeFlagsUnchanged
\end{DSPOpcode}
\begin{DSPOpcode}{SBCLR} \begin{DSPOpcode}{SBCLR}
\begin{DSPOpcodeBytefield}{16} \begin{DSPOpcodeBytefield}{16}
\monobitbox{4}{0001} & \monobitbox{4}{0010} & \monobitbox{4}{0000} & \monobitbox{4}{0iii} \monobitbox{4}{0001} & \monobitbox{4}{0010} & \monobitbox{4}{0000} & \monobitbox{4}{0iii}
@ -4897,7 +4925,7 @@ Instruction & Opcode & Page \\ \hline
\OpcodeRow{0000 0010 1001 cccc aaaa aaaa aaaa aaaa}{Jcc} \OpcodeRow{0000 0010 1001 cccc aaaa aaaa aaaa aaaa}{Jcc}
\OpcodeRow{0000 0010 1011 cccc aaaa aaaa aaaa aaaa}{CALLcc} \OpcodeRow{0000 0010 1011 cccc aaaa aaaa aaaa aaaa}{CALLcc}
\OpcodeRow{0000 0010 1101 cccc}{RETcc} \OpcodeRow{0000 0010 1101 cccc}{RETcc}
\OpcodeRow{0000 0010 1111 1111}{RTI} \OpcodeRow{0000 0010 1111 cccc}{RTIcc}
\OpcodeRowSkip \OpcodeRowSkip
\OpcodeRow{0000 001r 0000 0000 iiii iiii iiii iiii}{ADDI} \OpcodeRow{0000 001r 0000 0000 iiii iiii iiii iiii}{ADDI}
\OpcodeRow{0000 001r 0010 0000 iiii iiii iiii iiii}{XORI} \OpcodeRow{0000 001r 0010 0000 iiii iiii iiii iiii}{XORI}