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Fix typos in some of the opcode binary layouts

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Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
This commit is contained in:
Alek Ratzloff
2020-02-03 18:00:24 -05:00
parent 214f0b8aed
commit 329e61e087
1 changed files with 7 additions and 9 deletions
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16
vm.md
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@@ -23,7 +23,8 @@ CPU registers are addressed by a value between 0-63 (6 bits). All registers are
* SP - Stack pointer
* FP - Frame pointer
* FLAGS - CPU flags
* (9 unused registers)
* NULL - Always zero for reading and will never change after writing.
* (8 unused registers)
* STATUS - Generic status code
* R0-R49
@@ -43,7 +44,6 @@ CPU flags are addressed by bit index, going from right to left.
## Register ideas
* NULL - a register that will always be zero for reading and will not change after writing.
* Other possible names: Z, NIL
# Instructions
@@ -269,7 +269,7 @@ wrapping around to 0.
opcode reg1 unused
/ / /
+----------------------------------------+
| 0001000000000000 | ...... | XXXXXXXXXX |
| 0001000100000000 | ...... | XXXXXXXXXX |
+----------------------------------------+
```
@@ -287,7 +287,7 @@ wrapping around to 0.
opcode reg1 unused
/ / /
+----------------------------------------+
| 0001000000000001 | ...... | XXXXXXXXXX |
| 0001000100000001 | ...... | XXXXXXXXXX |
+----------------------------------------+
```
* Jnz
@@ -304,7 +304,7 @@ wrapping around to 0.
opcode reg1 unused
/ / /
+----------------------------------------+
| 0001000000000002 | ...... | XXXXXXXXXX |
| 0001000100000002 | ...... | XXXXXXXXXX |
+----------------------------------------+
```
@@ -398,7 +398,7 @@ wrapping around to 0.
opcode
/
+------------------+
| 0010011000000000 |
| 1111000000000000 |
+------------------+
```
* Nop
@@ -410,7 +410,7 @@ wrapping around to 0.
opcode
/
+------------------+
| 0010011000000001 |
| 1111000000000001 |
+------------------+
```
@@ -499,6 +499,4 @@ A VM must provide support for the following meta-values:
* Interrupts
* MMIO regions
* Execution pipeline
* Helps to define when certain side effects happen (e.g. when the IP increments)
* Paging?