800 lines
29 KiB
Python
800 lines
29 KiB
Python
# MIT License
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#
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# Copyright (c) 2023 Neil Webber
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from types import SimpleNamespace
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from machine import PDP1170
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from branches import BRANCH_CODES
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from pdptraps import PDPTraps
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import unittest
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import random
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from pdpasmhelper import PDP11InstructionAssembler as ASM
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class TestMethods(unittest.TestCase):
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PDPLOGLEVEL = 'INFO'
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# DISCLAIMER ABOUT TEST CODING PHILOSOPHY:
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# For the most part, actual PDP-11 machine code is created and
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# used to establish the test conditions, as this provides additional
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# (albeit haphazard) testing of the functionality. Occasionally it's
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# just too much hassle to do that and the pdp object is manipulated
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# directly via methods/attributes to establish conditions.
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# There's no rhyme or reason in picking the approach for a given test.
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# used to create various instances, collects all the options
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# detail into this one place... mostly this is about loglevel
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@classmethod
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def make_pdp(cls):
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return PDP1170(loglevel=cls.PDPLOGLEVEL)
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@staticmethod
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def ioaddr(p, offs):
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"""Given a within-IO-page IO offset, return an IO addr."""
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return (offs + p.mmu.iopage_base) & 0o177777
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# convenience routine to load word values into physical memory
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@staticmethod
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def loadphysmem(p, words, addr):
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for a, w in enumerate(words, start=(addr >> 1)):
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p.physmem[a] = w
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# some of these can't be computed at class definition time, so...
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@classmethod
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def usefulconstants(cls):
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p = cls.make_pdp() # meh, need this for some constants
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ns = SimpleNamespace()
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# Kernel instruction space PDR registers
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ns.KISD0 = cls.ioaddr(p, p.mmu.APR_KERNEL_OFFS)
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# Kernel data space PDR registers
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ns.KDSD0 = ns.KISD0 + 0o20
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# Kernel instruction space PAR registers
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ns.KISA0 = ns.KDSD0 + 0o20
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# Kernel data space PAR registers
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ns.KDSA0 = ns.KISA0 + 0o20
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# User mode similar
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ns.UISD0 = cls.ioaddr(p, p.mmu.APR_USER_OFFS)
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ns.UDSD0 = ns.UISD0 + 0o20
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ns.UISA0 = ns.UDSD0 + 0o20
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ns.UDSA0 = ns.UISA0 + 0o20
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ns.MMR0 = cls.ioaddr(p, p.mmu.MMR0_OFFS)
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ns.MMR3 = cls.ioaddr(p, p.mmu.MMR3_OFFS)
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return ns
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#
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# Create and return a test machine with a simple memory mapping:
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# Kernel Instruction space seg 0 points to physical 0
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# Kernel Data space segment 0 also points to physical 0
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# User instruction space seg 0 points to physical 0o20000
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# User Data space seg 0 points to physical 0o40000
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# and turns on the MMU
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#
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# premmu is an optional list of instructions to execute
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# before turning on the MMU
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#
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# postmmu is an optional list of instructions to execute
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# after turning on the MMU
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#
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def simplemapped_pdp(self, p=None, *, premmu=[], postmmu=[]):
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if p is None:
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p = self.make_pdp()
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cn = self.usefulconstants()
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# this is a table of instructions that ...
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# Puts the system stack at 0o20000 (8K)
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# Puts 0o22222 into physical location 0o20000
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# Puts 0o33333 into physical location 0o20002
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# Puts 0o44444 into physical location 0o40000
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# Sets Kernel Instruction space A0 to point to physical 0
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# Sets Kernel Data space A0 to point to physical 0
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# Sets Kernel Data space A7 to point to the IO page
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# Sets User Instruction space A0 to point to physical 0o20000
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# sets User Data space D0 to point to physical 0o40000
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# and turns on the MMU with I/D sep
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#
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# These instructions will be placed at 2K in memory
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#
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with ASM() as a:
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a.mov(0o20000, 'sp') # start system stack at 8k
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# write the constants as described above
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a.mov(0o22222, a.ptr(0o20000))
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a.mov(0o33333, a.ptr(0o20002))
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a.mov(0o44444, a.ptr(0o40000))
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# point both kernel seg 0 PARs to physical zero
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a.clr(a.ptr(cn.KISA0))
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a.clr(a.ptr(cn.KDSA0))
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# kernel seg 7 D space PAR to I/O page (at 22-bit location)
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a.mov(0o017760000 >> 6, a.ptr(cn.KDSA0 + (7 * 2)))
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# user I seg 0 to 0o20000, user D seg 0 to 0o40000
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a.mov(0o20000 >> 6, a.ptr(cn.UISA0))
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a.mov(0o40000 >> 6, a.ptr(cn.UDSA0))
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# set the PDRs for segment zero
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a.mov(0o077406, 'r3')
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# 77406 = PDR<2:0> = ACF = 0o110 = read/write
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# PLF<14:8> =0o0774 = full length (128*64 bytes = 8K)
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a.mov('r3', a.ptr(cn.KISD0))
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a.mov('r3', a.ptr(cn.KDSD0))
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a.mov('r3', a.ptr(cn.UISD0))
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a.mov('r3', a.ptr(cn.UDSD0))
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# PDR for segment 7
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a.mov('r3', a.ptr(cn.KDSD0 + (7 * 2)))
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# set previous mode to USER, keeping current mode KERNEL, pri 7
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a.mov((p.KERNEL << 14) | (p.USER << 12) | (7 << 5),
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a.ptr(self.ioaddr(p, p.PS_OFFS)))
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# turn on 22-bit mode, unibus mapping, and I/D sep for k & u
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a.mov(0o000065, a.ptr(cn.MMR3))
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# Instructions supplied by caller, to be execute before
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# enabling the MMU. They are "literals" since they have
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# already been assembled.
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for w in premmu:
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a.literal(w)
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# turn on relocation mode ...
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a.inc(a.ptr(cn.MMR0))
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# and the post-MMU instructions
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for w in postmmu:
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a.literal(w)
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a.halt()
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instloc = 0o4000 # 2K
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self.loadphysmem(p, a.instructions(), instloc)
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return p, instloc
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# these tests end up testing a other stuff too of course, including MMU
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def test_mfpi(self):
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tvecs = []
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for result, r1tval in ((0o33333, 2), (0o22222, 0)):
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# r1=r1tval, mfpi (r1) -> r0; expect r0 = result
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with ASM() as a:
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a.mov(r1tval, 'r1')
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a.mfpi('(r1)')
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a.mov('(sp)+', 'r0')
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tvecs.append((result, a.instructions()))
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for result, insts in tvecs:
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with self.subTest(result=result, insts=insts):
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p, pc = self.simplemapped_pdp(postmmu=insts)
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p.run(pc=pc)
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self.assertEqual(p.r[0], result)
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def test_mfpxsp(self):
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cn = self.usefulconstants()
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with ASM() as u:
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u.mov('r2', 'r6')
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u.trap(0)
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user_mode_instructions = u.instructions()
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with ASM() as premmu:
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ts = premmu # just for brevity...
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ts.mov(0o14000, ts.ptr(0o34)) # set vector 034 to 14000
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ts.clr(ts.ptr(0o36)) # PSW for trap - zero work
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ts.mov(0o20000, 'r0') # mov #20000,r0
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for uinst in user_mode_instructions:
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ts.mov(uinst, '(r0)+')
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ts.mov(0o123456, 'r2') # mov #123456,r2
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ts.mov(0o140340, '-(sp)') # push user-ish PSW to K stack
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ts.clr('-(sp)') # new user PC = 0
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with ASM() as postmmu:
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postmmu.literal(6) # RTT - goes to user mode, addr 0
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p, pc = self.simplemapped_pdp(premmu=premmu.instructions(),
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postmmu=postmmu.instructions())
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# put the trap handler at 14000 as expected
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with ASM() as th:
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th.mfpd('sp')
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th.mov('(sp)+', 'r3')
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th.halt()
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self.loadphysmem(p, th.instructions(), 0o14000)
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p.run(pc=pc)
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self.assertEqual(p.r[2], p.r[3])
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def test_mtpi(self):
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cn = self.usefulconstants()
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with ASM() as ts:
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ts.mov(0o1717, '-(sp)') # pushing 0o1717
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ts.mtpi(ts.ptr(0o02)) # and MTPI it to user location 2
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ts.clr(ts.ptr(cn.MMR0)) # turn MMU back off
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ts.mov(ts.ptr(0o20002), 'r0') # r0 = (020002)
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tvecs = ((0o1717, ts.instructions()),)
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for r0result, insts in tvecs:
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with self.subTest(r0result=r0result, insts=insts):
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p, pc = self.simplemapped_pdp(postmmu=insts)
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p.run(pc=pc)
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self.assertEqual(p.r[0], r0result)
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def test_add_sub(self):
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p = self.make_pdp()
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testvecs = (
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# (op0, op1, expected op0 + op1, nzvc, expected op0 - op1, nzvc)
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# None for nzvc means dont test that (yet/for-now/need to verify)
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(1, 1, 2, 0, 0, 4), # 1 + 1 = 2(_); 1 - 1 = 0(Z)
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(1, 32767, 32768, 0o12, 32766, 0),
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(0, 0, 0, 0o04, 0, 0o04),
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(32768, 1, 32769, 0o10, 32769, 0o13),
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(65535, 1, 0, 0o05, 2, 1),
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)
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testloc = 0o10000
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add_loc = testloc
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sub_loc = testloc + 4
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for addsub, loc in (('add', add_loc), ('sub', sub_loc)):
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with ASM() as a:
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getattr(a, addsub)('r0', 'r1')
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a.halt()
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for offs, inst in enumerate(a.instructions()):
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p.physmem[(loc >> 1) + offs] = inst
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for r0, r1, added, a_nzvc, subbed, s_nzvc in testvecs:
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with self.subTest(r0=r0, r1=r1, op="add"):
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p.r[0] = r0
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p.r[1] = r1
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p.run(pc=add_loc)
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self.assertEqual(p.r[1], added)
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if a_nzvc is not None:
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self.assertEqual(p.psw & 0o17, a_nzvc)
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with self.subTest(r0=r0, r1=r1, op="sub"):
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p.r[0] = r0
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p.r[1] = r1
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p.run(pc=sub_loc)
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self.assertEqual(p.r[1], subbed)
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if s_nzvc is not None:
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self.assertEqual(p.psw & 0o17, s_nzvc)
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# test BNE (and, implicitly, INC/DEC)
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def test_bne(self):
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p = self.make_pdp()
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loopcount = 0o1000
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with ASM() as a:
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# Program is:
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# MOV loopcount,R1
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# CLR R0
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# LOOP: INC R0
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# DEC R1
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# BNE LOOP
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# HALT
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a.mov(loopcount, 'r1')
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a.clr('r0')
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a.label('LOOP')
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a.inc('r0')
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a.dec('r1')
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a.bne('LOOP')
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a.halt()
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instloc = 0o4000
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self.loadphysmem(p, a.instructions(), instloc)
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p.run(pc=instloc)
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self.assertEqual(p.r[0], loopcount)
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self.assertEqual(p.r[1], 0)
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# test BEQ and BNE (BNE was also tested in test_bne)
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def test_eqne(self):
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p = self.make_pdp()
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goodval = 0o4321 # arbitrary, not zero
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with ASM() as a:
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a.clr('r1') # if successful r1 will become goodval
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a.clr('r0')
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a.beq(+1)
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a.halt() # stop here if BEQ fails
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a.literal(0o000257) # 1f: CCC .. clear all the condition codes
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a.bne(+1)
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a.halt() # stop here if BNE fails
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a.mov(goodval, 'r1') # indicate success
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a.halt()
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instloc = 0o4000
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self.loadphysmem(p, a.instructions(), instloc)
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p.run(pc=instloc)
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self.assertEqual(p.r[1], goodval)
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# create the instruction sequence shared by test_cc and test_ucc
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def _cc_unscc(self, br1, br2):
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with ASM() as a:
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# program is:
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# CLR R0
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# MOV @#05000,R1 ; see discussion below
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# MOV @#05002,R2 ; see discussion below
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# CMP R1,R2
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# br1 1f ; see discussion
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# HALT
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# 1: DEC R0
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# CMP R2,R1
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# br2 1f ; see discussion
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# HALT
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# 1: DEC R0
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# HALT
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#
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# The test_cc and test_unscc tests will poke various test
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# cases into locations 5000 and 5002, knowing the order of
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# the operands in the two CMP instructions and choosing
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# test cases and br1/br2 accordingly.
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#
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# If the program makes it to the end R0 will be 65554 (-2)
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a.clr('r0')
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a.mov(a.ptr(0o5000), 'r1')
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a.mov(a.ptr(0o5002), 'r2')
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a.cmp('r1', 'r2')
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a.literal((br1 & 0o177400) | 1) # br1 1f
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a.halt()
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a.dec('r0')
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a.cmp('r2', 'r1')
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a.literal((br2 & 0o177400) | 1) # br2 1f
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a.halt()
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a.dec('r0')
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a.halt()
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return a.instructions()
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def test_cc(self):
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# various condition code tests
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p = self.make_pdp()
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insts = self._cc_unscc(BRANCH_CODES['blt'], BRANCH_CODES['bgt'])
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instloc = 0o4000
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self.loadphysmem(p, insts, instloc)
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# just a convenience so the test data can use neg numbers
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def s2c(x):
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return x & 0o177777
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for lower, higher in ((0, 1), (s2c(-1), 0), (s2c(-1), 1),
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(s2c(-32768), 32767),
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(s2c(-32768), 0), (s2c(-32768), 32767),
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(17, 42), (s2c(-42), s2c(-17))):
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p.physmem[0o5000 >> 1] = lower
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p.physmem[0o5002 >> 1] = higher
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with self.subTest(lower=lower, higher=higher):
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p.run(pc=instloc)
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self.assertEqual(p.r[0], 65534)
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# probably never a good idea, but ... do some random values
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for randoms in range(1000):
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a = random.randint(-32768, 32767)
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b = random.randint(-32768, 32767)
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while a == b:
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b = random.randint(-32768, 32767)
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if a > b:
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a, b = b, a
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p.physmem[0o5000 >> 1] = s2c(a)
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p.physmem[0o5002 >> 1] = s2c(b)
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with self.subTest(lower=a, higher=b):
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p.run(pc=instloc)
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self.assertEqual(p.r[0], 65534)
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def test_unscc(self):
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# more stuff like test_cc but specifically testing unsigned Bxx codes
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p = self.make_pdp()
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insts = self._cc_unscc(BRANCH_CODES['blo'], BRANCH_CODES['bhi'])
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instloc = 0o4000
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self.loadphysmem(p, insts, instloc)
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for lower, higher in ((0, 1), (0, 65535), (32768, 65535),
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(65534, 65535),
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(32767, 32768),
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(17, 42)):
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p.physmem[0o5000 >> 1] = lower
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p.physmem[0o5002 >> 1] = higher
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with self.subTest(lower=lower, higher=higher):
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p.run(pc=instloc)
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self.assertEqual(p.r[0], 65534)
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# probably never a good idea, but ... do some random values
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for randoms in range(1000):
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a = random.randint(0, 65535)
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b = random.randint(0, 65535)
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while a == b:
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b = random.randint(0, 65535)
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if a > b:
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a, b = b, a
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p.physmem[0o5000 >> 1] = a
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p.physmem[0o5002 >> 1] = b
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with self.subTest(lower=a, higher=b):
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p.run(pc=instloc)
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self.assertEqual(p.r[0], 65534)
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def test_ash1(self):
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# this code sequence taken from Unix startup, it's not really
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# much of a test.
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with ASM() as a:
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a.mov(0o0122451, 'r2') # mov #122451,R2
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a.literal(0o072200, 0o0177772) # ash -6,R2
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a.bic(0o0176000, 'r2') # bic #0176000,R2
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a.halt()
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p = self.make_pdp()
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instloc = 0o4000
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self.loadphysmem(p, a.instructions(), instloc)
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|
p.run(pc=instloc)
|
|
self.assertEqual(p.r[2], 0o1224)
|
|
|
|
def test_br(self):
|
|
# though the bug has been fixed, this is a test of whether
|
|
# all branch offset values work correctly. Barn door shut...
|
|
p = self.make_pdp()
|
|
|
|
# the idea is a block of INC R0 instructions
|
|
# followed by a halt, then a spot for a branch
|
|
# then a block of INC R1 instructions followed by a halt
|
|
#
|
|
# By tweaking the BR instruction (different forward/back offsets)
|
|
# and starting execution at the BR, the result on R0 and R1
|
|
# will show if the correct branch offset was effected.
|
|
#
|
|
# NOTE: 0o477 (branch offset -1) is a tight-loop branch to self
|
|
# and that case is tested separately.
|
|
#
|
|
insts = [0o5200] * 300 # 300 INC R0 instructions
|
|
insts += [0] # 1 HALT instruction
|
|
insts += [0o477] # BR instruction .. see below
|
|
|
|
# want to know where in memory this br will is
|
|
brspot = len(insts) - 1
|
|
|
|
insts += [0o5201] * 300 # 300 INC R1 instructions
|
|
insts += [0] # 1 HALT instruction
|
|
|
|
# put that mess into memory at an arbitrary spot
|
|
baseloc = 0o10000
|
|
for a, w in enumerate(insts, start=(baseloc >> 1)):
|
|
p.physmem[a] = w
|
|
|
|
# test the negative offsets:
|
|
# Set R0 to 65535 (-1)
|
|
# Set R1 to 17
|
|
# -1 is a special case, that's the tight loop and not tested here
|
|
# -2 reaches the HALT instruction only, R0 will remain 65535
|
|
# -3 reaches back to one INC R0, R0 will be 0
|
|
# -4 reaches back two INC R0's, R0 will be 1
|
|
# and so on
|
|
|
|
# 0o400 | offset starting at 0o376 will be the BR -2 case
|
|
expected_R0 = 65535
|
|
for offset in range(0o376, 0o200, -1):
|
|
p.physmem[(baseloc >> 1) + brspot] = (0o400 | offset)
|
|
p.r[0] = 65535
|
|
p.r[1] = 17
|
|
|
|
# note the 2* because PC is an addr vs physmem word index
|
|
p.run(pc=baseloc + (2*brspot))
|
|
|
|
with self.subTest(offset=offset):
|
|
self.assertEqual(p.r[0], expected_R0)
|
|
self.assertEqual(p.r[1], 17)
|
|
expected_R0 = (expected_R0 + 1) & 0o177777
|
|
|
|
# and the same sort of test but with forward branching
|
|
|
|
expected_R1 = 42 + 300
|
|
for offset in range(0, 0o200):
|
|
p.physmem[(baseloc >> 1) + brspot] = (0o400 | offset)
|
|
p.r[0] = 17
|
|
p.r[1] = 42
|
|
|
|
# note the 2* because PC is an addr vs physmem word index
|
|
p.run(pc=baseloc + (2*brspot))
|
|
|
|
with self.subTest(offset=offset):
|
|
self.assertEqual(p.r[0], 17)
|
|
self.assertEqual(p.r[1], expected_R1)
|
|
expected_R1 = (expected_R1 - 1) & 0o177777
|
|
|
|
def test_trap(self):
|
|
# test some traps
|
|
|
|
p = self.make_pdp()
|
|
|
|
# put a handlers for different traps into memory
|
|
# starting at location 0o10000 (4K). This just knows
|
|
# that each handler is 3 words long, the code being:
|
|
# MOV something,R4
|
|
# RTT
|
|
#
|
|
# where the "something" changes with each handler.
|
|
handlers_addr = 0o10000
|
|
handlers = (
|
|
0o012704, 0o4444, 0o000006, # for vector 0o004
|
|
0o012704, 0o1010, 0o000006, # for vector 0o010
|
|
0o012704, 0o3030, 0o000006, # for vector 0o030
|
|
0o012704, 0o3434, 0o000006 # for vector 0o034
|
|
)
|
|
self.loadphysmem(p, handlers, handlers_addr)
|
|
|
|
# and just jam the vectors in place
|
|
p.physmem[2] = handlers_addr # vector 0o004
|
|
p.physmem[3] = 0 # new PSW, stay in kernel mode
|
|
p.physmem[4] = handlers_addr + 6 # each handler above was 6 bytes
|
|
p.physmem[5] = 0
|
|
p.physmem[12] = handlers_addr + 12 # vector 0o30 (EMT)
|
|
p.physmem[13] = 0
|
|
p.physmem[14] = handlers_addr + 18 # vector 0o34 (TRAP)
|
|
p.physmem[15] = 0
|
|
|
|
# (tnum, insts)
|
|
testvectors = (
|
|
# this will reference an odd address, trap 4
|
|
(0o4444, (
|
|
# establish reasonable stack pointer (at 8K)
|
|
0o012706, 0o20000,
|
|
# CLR R3 and R4 so will know if they get set to something
|
|
0o005003, 0o005004,
|
|
# put 0o1001 into R0
|
|
0o012700, 0o1001,
|
|
# and reference it ... boom!
|
|
0o011001,
|
|
# show that the RTT got to here by putting magic into R3
|
|
0o012703, 0o123456)),
|
|
|
|
# this will execute a reserved instruction trap 10
|
|
(0o1010, (
|
|
# establish reasonable stack pointer (at 8K)
|
|
0o012706, 0o20000,
|
|
# CLR R3 and R4 so will know if they get set to something
|
|
0o005003, 0o005004,
|
|
# 0o007777 is a reserved instruction ... boom!
|
|
0o007777,
|
|
# show that the RTT got to here by putting magic into R3
|
|
0o012703, 0o123456)),
|
|
|
|
# this will execute an EMT instruction
|
|
(0o3030, (
|
|
# establish reasonable stack pointer (at 8K)
|
|
0o012706, 0o20000,
|
|
# CLR R3 and R4 so will know if they get set to something
|
|
0o005003, 0o005004,
|
|
# EMT #42
|
|
0o104042,
|
|
# show that the RTT got to here by putting magic into R3
|
|
0o012703, 0o123456)),
|
|
|
|
# this will execute an actual TRAP instruction
|
|
(0o3434, (
|
|
# establish reasonable stack pointer (at 8K)
|
|
0o012706, 0o20000,
|
|
# CLR R3 and R4 so will know if they get set to something
|
|
0o005003, 0o005004,
|
|
# TRAP #17
|
|
0o104417,
|
|
# show that the RTT got to here by putting magic into R3
|
|
0o012703, 0o123456)),
|
|
)
|
|
|
|
for R4, insts in testvectors:
|
|
self.loadphysmem(p, insts, 0o3000)
|
|
p.run(pc=0o3000)
|
|
self.assertEqual(p.r[3], 0o123456)
|
|
self.assertEqual(p.r[4], R4)
|
|
|
|
def test_trapcodes(self):
|
|
# a more ambitious testing of TRAP which verifies all
|
|
# available TRAP instruction codes work
|
|
|
|
p = self.make_pdp()
|
|
# poke the TRAP vector info directly in
|
|
p.physmem[14] = 0o10000 # vector 0o34 (TRAP) --> 0o10000
|
|
p.physmem[15] = 0
|
|
|
|
# this trap handler puts the trap # into R3
|
|
with ASM() as handler:
|
|
# the saved PC is at the top of the stack ... get it
|
|
handler.mov('(sp)', 'r0')
|
|
# get the low byte of the instruction which is the trap code
|
|
# note that the PC points after the TRAP instruction so:
|
|
handler.movb('-2(r0)', 'r3')
|
|
handler.rtt()
|
|
|
|
self.loadphysmem(p, handler.instructions(), 0o10000)
|
|
|
|
# just bash a stack pointer directly in
|
|
p.r[6] = 0o20000 # 8K and working down
|
|
|
|
for i in range(256):
|
|
with ASM() as a:
|
|
a.trap(i) # TRAP #i
|
|
a.mov('r3', 'r1') # MOV R3,R1 just to show RTT worked
|
|
a.halt()
|
|
|
|
self.loadphysmem(p, a.instructions(), 0o30000)
|
|
p.run(pc=0o30000)
|
|
self.assertEqual(p.r[3], p.r[1])
|
|
|
|
# because the machine code did MOVB, values over 127 get
|
|
# sign extended, so take that into consideration
|
|
if i > 127:
|
|
trapexpected = 0xFF00 | i
|
|
else:
|
|
trapexpected = i
|
|
self.assertEqual(p.r[1], trapexpected)
|
|
|
|
# test_mmu_1 .. test_mmu_N .. a variety of MMU tests.
|
|
#
|
|
# Any of the other tests that use simplemapped_pdp() implicitly
|
|
# test some aspects of the MMU but these are more targeted tests.
|
|
# NOTE: it's a lot easier to test via the methods than via writing
|
|
# elaborate PDP-11 machine code so that's what these do.
|
|
|
|
def test_mmu_1(self):
|
|
# test the page length field support
|
|
p = self.make_pdp()
|
|
|
|
# using ED=0 (segments grow upwards), create a (bizarre!)
|
|
# user DSPACE mapping where the the first segment has length 0,
|
|
# the second has 16, the third has 32 ... etc and then check
|
|
# that that valid addresses map correctly and invalid ones fault
|
|
# correctly. NOTE that there are subtle semantics to the so-called
|
|
# "page length field" ... in a page that grows upwards, a plf of
|
|
# zero means that to be INVALID the block number has to be greater
|
|
# than zero (therefore "zero" length really means 64 bytes of
|
|
# validity) and there is a similar off-by-one semantic to ED=1
|
|
# downward pages. The test understands this.
|
|
|
|
cn = self.usefulconstants()
|
|
for segno in range(8):
|
|
p.mmu.wordRW(cn.UDSA0 + (segno*2), (8192 * segno) >> 6)
|
|
pln = segno * 16
|
|
p.mmu.wordRW(cn.UDSD0 + (segno*2), (pln << 8) | 0o06)
|
|
|
|
# enable user I/D separation
|
|
p.mmu.MMR3 |= 0o01
|
|
|
|
# turn on the MMU!
|
|
p.mmu.MMR0 = 1
|
|
|
|
for segno in range(8):
|
|
basea = segno * 8192
|
|
maxvalidoffset = 63 + ((segno * 64) * 16)
|
|
for o in range(8192):
|
|
if o <= maxvalidoffset:
|
|
_ = p.mmu.v2p(basea + o, p.USER, p.mmu.DSPACE,
|
|
p.mmu.CYCLE.READ)
|
|
else:
|
|
with self.assertRaises(PDPTraps.MMU):
|
|
_ = p.mmu.v2p(basea + o, p.USER, p.mmu.DSPACE,
|
|
p.mmu.CYCLE.READ)
|
|
|
|
def test_mmu_2(self):
|
|
# same test as _1 but with ED=1 so segments grow downwards
|
|
# test the page length field support
|
|
p = self.make_pdp()
|
|
|
|
cn = self.usefulconstants()
|
|
for segno in range(8):
|
|
p.mmu.wordRW(cn.UDSA0 + (segno*2), (8192 * segno) >> 6)
|
|
pln = 0o177 - (segno * 16)
|
|
p.mmu.wordRW(cn.UDSD0 + (segno*2), (pln << 8) | 0o16)
|
|
|
|
# enable user I/D separation
|
|
p.mmu.MMR3 |= 0o01
|
|
|
|
# turn on the MMU!
|
|
p.mmu.MMR0 = 1
|
|
|
|
for segno in range(8):
|
|
basea = segno * 8192
|
|
minvalidoffset = 8192 - (64 + ((segno * 64) * 16))
|
|
for o in range(8192):
|
|
if o >= minvalidoffset:
|
|
_ = p.mmu.v2p(basea + o, p.USER, p.mmu.DSPACE,
|
|
p.mmu.CYCLE.READ)
|
|
else:
|
|
with self.assertRaises(PDPTraps.MMU):
|
|
_ = p.mmu.v2p(basea + o, p.USER, p.mmu.DSPACE,
|
|
p.mmu.CYCLE.READ)
|
|
|
|
def test_ubmap(self):
|
|
p = self.make_pdp()
|
|
|
|
ubmaps = self.ioaddr(p, p.ub.UBMAP_OFFS)
|
|
|
|
# code paraphrased from UNIX startup, creates a mapping pattern
|
|
# that the rest of the code expects (and fiddles upper bits)
|
|
# So ... test that.
|
|
for i in range(0, 62, 2):
|
|
p.mmu.wordRW(ubmaps + (2 * i), i << 12 & 0o1777777)
|
|
p.mmu.wordRW(ubmaps + (2 * (i + 1)), 0)
|
|
|
|
# XXX there is no real test yet because the UBMAPs
|
|
# are all just dummied up right now
|
|
|
|
# this is not a unit test, invoke it using timeit etc
|
|
def speed_test_setup(self, *, loopcount=10000, mmu=True, inst=None):
|
|
|
|
p, pc = self.simplemapped_pdp()
|
|
|
|
# the returned pdp is loaded with instructions for setting up
|
|
# the mmu; only do them if that's what is wanted
|
|
if mmu:
|
|
p.run(pc=pc)
|
|
|
|
# by default the instruction being timed will be MOV R1,R0
|
|
# but other instructions could be used. MUST ONLY BE ONE WORD
|
|
if inst is None:
|
|
inst = 0o010100
|
|
|
|
# now load the test timing loop... 9 MOV R1,R0 instructions
|
|
# and an SOB for looping (so 10 instructions per loop)
|
|
|
|
insts = (0o012704, loopcount, # loopcount into R4
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
inst,
|
|
|
|
0o077412, # SOB R4 back to first inst
|
|
0) # HALT
|
|
|
|
instloc = 0o4000
|
|
for a2, w in enumerate(insts):
|
|
p.mmu.wordRW(instloc + (2 * a2), w)
|
|
return p, instloc
|
|
|
|
def speed_test_run(self, p, instloc):
|
|
p.run(pc=instloc)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|