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kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
kissa.bsky.social

Day 2 of virtual machine hacking, think I’ll do byte addressing now

Autumn
1
kissa.bsky.social

Added some printf debugging machinery to find out why my second add instruction didn't run, can you guess why?

✓ jump relative with add [0.03ms] step: pc 0x0100 step: instr add (0x0000) step: pc 0x0104 step: instr hlt (0x00f0) ✓ program with byte addressing [0.08ms]
test("program with byte addressing", () => { // add a, a, c.hi write8(0x100, instructions.add) write8(0x101, A) write8(0x102, A) write8(0x103, hi(C)) // add b, c, c.lo write8(0x104, instructions.add) write8(0x105, B) write8(0x106, B) write8(0x107, lo(C)) write8(0x104, instructions.hlt) // Set initial values to registers and point PC to start write(PC, 0x100) // C contains high byte 0x1f, and low byte 0xf1 write(C, 0x1ff1) debugOn() run() debugOff() // expect(read(A)).toBe(0x1f) // B should be sign-extended // expect(read(B)).toBe(0xfff1) })
1
kissa.bsky.social
@kissa.bsky.social
Tomfoolery, nincompoopery, programming
37 followers374 following39 posts
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