Add more instructions

7 files changed, 74 insertions, 0 deletions

diff --git a/cpu/instructions/arithmetic/add.txt b/cpu/instructions/arithmetic/add.txt
new file mode 100644
index 0000000..3668033
--- /dev/null
+++ b/cpu/instructions/arithmetic/add.txt
@@ -0,0 +1,10 @@
+Number of parameters: 3
+
+Usage:
+	Add <output> <value0> <value1>
+
+Effect:
+	Adds <value0> to <value1> and stores it in <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/decrement.txt b/cpu/instructions/arithmetic/decrement.txt
new file mode 100644
index 0000000..7d56a45
--- /dev/null
+++ b/cpu/instructions/arithmetic/decrement.txt
@@ -0,0 +1,10 @@
+Number of parameters: 1
+
+Usage:
+	decrement <output>
+
+Effect:
+	Subtracts 1 from <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/increment.txt b/cpu/instructions/arithmetic/increment.txt
new file mode 100644
index 0000000..60cd856
--- /dev/null
+++ b/cpu/instructions/arithmetic/increment.txt
@@ -0,0 +1,10 @@
+Number of parameters: 1
+
+Usage:
+	increment <output>
+
+Effect:
+	Adds 1 to <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/notes.txt b/cpu/instructions/arithmetic/notes.txt
new file mode 100644
index 0000000..29500cb
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+++ b/cpu/instructions/arithmetic/notes.txt
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+Unless otherwise specified, all arithmetic instructions:
+	Set the zero flag when the result is 0
+	Set the overflow flag when a signed operation results in inversion of the sign due to lack of bits to store the value
+	Set the carry flag when an unsigned operation results in a lower number due to lack of bits to store the value
diff --git a/cpu/instructions/arithmetic/subtract.txt b/cpu/instructions/arithmetic/subtract.txt
new file mode 100644
index 0000000..273ca46
--- /dev/null
+++ b/cpu/instructions/arithmetic/subtract.txt
@@ -0,0 +1,10 @@
+Number of parameters: 3
+
+Usage:
+	Subtract <output> <value0> <value1>
+
+Effect:
+	Subtracts <value0> from <value1> and stores it in <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/conditions/bitwise_condition.txt b/cpu/instructions/conditions/bitwise_condition.txt
new file mode 100644
index 0000000..48ddabd
--- /dev/null
+++ b/cpu/instructions/conditions/bitwise_condition.txt
@@ -0,0 +1,12 @@
+Number of parameters: 3
+
+Usage:
+	bitwise_condition <input> <bits to be compared> <value to compare with>
+
+Effect:
+	Sets the zero flag if exactly one of <bits to be compared> in <input> match <value to compare with>
+	Sets the overflow flag if at least one of <bits to be compared> in <input> match <value to compare with>
+	Sets the carry flag if all of <bits to be compared> in <input> match <value to compare with>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/conditions/save_condition.txt b/cpu/instructions/conditions/save_condition.txt
new file mode 100644
index 0000000..a7df9d2
--- /dev/null
+++ b/cpu/instructions/conditions/save_condition.txt
@@ -0,0 +1,18 @@
+Number of parameters:
+
+Usage:
+	save_condition <output> <offset> <conditional parameter>
+
+conditional parameter: same as is_conditional from ../opcode.txt, but with the following changes:
+	Values to be compared are instead xor'd
+
+Effect:
+	Saves the selected flags to <output> at bitwise position <offset>
+		Flags are xor'd with the comparison value
+		Resulting value is shifted down to not have gaps from unused flags
+
+Exceptions:
+	None
+
+Notes:
+	Will be executed in the conditional phase