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finally add the RET instruction

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A Chip-8 program that does something with the display (that is skipped) which i'm using to test now actually causes a stack overflow!
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abbie 2022-02-20 18:51:55 +00:00
parent 348b764f08
commit ba22aa482c
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GPG key ID: 04DDE463F9200F87
3 changed files with 7 additions and 3 deletions
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2
Cargo.lock generated
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@ -4,4 +4,4 @@ version = 3
[[package]] [[package]]
name = "celc8" name = "celc8"
version = "0.1.3" version = "0.1.4"

2
Cargo.toml
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@ -1,6 +1,6 @@
[package] [package]
name = "celc8" name = "celc8"
version = "0.1.3" version = "0.1.4"
edition = "2021" edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

6
src/main.rs
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@ -246,7 +246,11 @@ fn execute(opcode: u16, instruction: Instruction, mut cpu: Cpu) -> Cpu {
} }
} }
if instruction.name == "JP_ADDR" { cpu.setpc(args[0] as u16); } if instruction.name == "RET" {
let returnaddress = cpu.stackpop();
cpu.setpc(returnaddress);
}
else if instruction.name == "JP_ADDR" { cpu.setpc(args[0] as u16); }
else if instruction.name == "CALL_ADDR" { else if instruction.name == "CALL_ADDR" {
cpu.incrementsp(); cpu.incrementsp();
cpu.stackpush(); cpu.stackpush();