mirror of
https://git.k-space.ee/arti/vt1200.git
synced 2026-10-30 12:03:54 +02:00
47 lines
1.7 KiB
Lua
47 lines
1.7 KiB
Lua
-- probe_pc.lua -- sample PC/ST (IE flag) in the idle OS, and check that a
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-- bpset on a sampled address actually fires. Investigation only.
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local machine = manager.machine
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local cpu = machine.devices[':maincpu']
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local dbg = machine.debugger
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local prog = cpu.spaces['program']
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if not dbg then print("ERROR: no debugger"); machine:exit(); return end
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local IE = 0x200000
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local START = tonumber(os.getenv("PC_START") or "3200")
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local STOP = tonumber(os.getenv("PC_STOP") or "3300")
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local f = 0
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local armed = false
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local hist = {}
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local first = {}
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local rd = function(a) return prog:read_u16(a) end
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emu.register_frame_done(function()
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f = f + 1
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local pc = cpu.state['PC'].value
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local st = cpu.state['ST'].value
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hist[pc] = (hist[pc] or 0) + 1
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if not first[pc] then first[pc] = f end
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if f >= START and f <= STOP and f % 10 == 0 then
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print(string.format("f%4d PC=%08X ST=%08X IE=%d DPYINT=%04X INTENB=%04X INTPEND=%04X",
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f, pc, st, (st & IE) ~= 0 and 1 or 0, rd(0xc00000a0), rd(0xc0000110), rd(0xc0000120)))
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end
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if f == START and not armed then
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armed = true
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dbg:command(string.format('bpset %08X,,{ printf "PCHIT pc=%%08X\\n", pc ; g }', pc))
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dbg:command('bpset 3F579870,,{ printf "PCHIT2 pc=%08X\\n", pc ; g }')
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print(string.format("probe_pc: bpset on sampled idle PC %08X", pc))
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end
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if f >= STOP then
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print("--- hottest PCs in window ---")
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local list = {}
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for k, c in pairs(hist) do list[#list + 1] = {k, c} end
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table.sort(list, function(a, b) return a[2] > b[2] end)
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for i = 1, math.min(10, #list) do
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print(string.format(" PC=%08X samples=%d first=%d", list[i][1], list[i][2], first[list[i][1]]))
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end
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machine:exit()
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end
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end, "vt1200-probe-pc")
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dbg.visible_cpu = cpu
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dbg.execution_state = 'run'
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