f7a015adf44e0f3131d1e2cb540d7aa95c07dc72
1 # SPDX-License-Identifier: LGPLv3+
2 # Copyright (C) 2020, 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
3 # Copyright (C) 2020 Michael Nolan
4 # Funded by NLnet http://nlnet.nl
5 """core of the python-based POWER9 simulator
7 this is part of a cycle-accurate POWER9 simulator. its primary purpose is
8 not speed, it is for both learning and educational purposes, as well as
9 a method of verifying the HDL.
13 * https://bugs.libre-soc.org/show_bug.cgi?id=424
16 from nmigen
.back
.pysim
import Settle
17 from functools
import wraps
19 from soc
.decoder
.orderedset
import OrderedSet
20 from soc
.decoder
.selectable_int
import (FieldSelectableInt
, SelectableInt
,
22 from soc
.decoder
.power_enums
import (spr_dict
, spr_byname
, XER_bits
,
23 insns
, MicrOp
, In1Sel
, In2Sel
, In3Sel
,
26 from soc
.decoder
.power_enums
import SPR
as DEC_SPR
28 from soc
.decoder
.helpers
import exts
, gtu
, ltu
, undefined
29 from soc
.consts
import PIb
, MSRb
# big-endian (PowerISA versions)
30 from soc
.decoder
.power_svp64
import SVP64RM
, decode_extra
32 from soc
.decoder
.isa
.radixmmu
import RADIX
33 from soc
.decoder
.isa
.mem
import Mem
, swap_order
35 from collections
import namedtuple
39 instruction_info
= namedtuple('instruction_info',
40 'func read_regs uninit_regs write_regs ' +
41 'special_regs op_fields form asmregs')
52 # TODO (lkcl): adjust other registers that should be in a particular order
53 # probably CA, CA32, and CR
70 def create_args(reglist
, extra
=None):
71 retval
= list(OrderedSet(reglist
))
72 retval
.sort(key
=lambda reg
: REG_SORT_ORDER
[reg
])
74 return [extra
] + retval
80 def __init__(self
, decoder
, isacaller
, svstate
, regfile
):
83 self
.isacaller
= isacaller
84 self
.svstate
= svstate
86 self
[i
] = SelectableInt(regfile
[i
], 64)
88 def __call__(self
, ridx
):
91 def set_form(self
, form
):
95 # rnum = rnum.value # only SelectableInt allowed
96 print("GPR getzero", rnum
)
98 return SelectableInt(0, 64)
101 def _get_regnum(self
, attr
):
102 getform
= self
.sd
.sigforms
[self
.form
]
103 rnum
= getattr(getform
, attr
)
106 def ___getitem__(self
, attr
):
107 """ XXX currently not used
109 rnum
= self
._get
_regnum
(attr
)
110 offs
= self
.svstate
.srcstep
111 print("GPR getitem", attr
, rnum
, "srcoffs", offs
)
112 return self
.regfile
[rnum
]
115 for i
in range(0, len(self
), 8):
118 s
.append("%08x" % self
[i
+j
].value
)
120 print("reg", "%2d" % i
, s
)
124 def __init__(self
, pc_init
=0):
125 self
.CIA
= SelectableInt(pc_init
, 64)
126 self
.NIA
= self
.CIA
+ SelectableInt(4, 64) # only true for v3.0B!
128 def update_nia(self
, is_svp64
):
129 increment
= 8 if is_svp64
else 4
130 self
.NIA
= self
.CIA
+ SelectableInt(increment
, 64)
132 def update(self
, namespace
, is_svp64
):
133 """updates the program counter (PC) by 4 if v3.0B mode or 8 if SVP64
135 self
.CIA
= namespace
['NIA'].narrow(64)
136 self
.update_nia(is_svp64
)
137 namespace
['CIA'] = self
.CIA
138 namespace
['NIA'] = self
.NIA
141 # Simple-V: see https://libre-soc.org/openpower/sv
143 def __init__(self
, init
=0):
144 self
.spr
= SelectableInt(init
, 32)
145 # fields of SVSTATE, see https://libre-soc.org/openpower/sv/sprs/
146 self
.maxvl
= FieldSelectableInt(self
.spr
, tuple(range(0,7)))
147 self
.vl
= FieldSelectableInt(self
.spr
, tuple(range(7,14)))
148 self
.srcstep
= FieldSelectableInt(self
.spr
, tuple(range(14,21)))
149 self
.dststep
= FieldSelectableInt(self
.spr
, tuple(range(21,28)))
150 self
.subvl
= FieldSelectableInt(self
.spr
, tuple(range(28,30)))
151 self
.svstep
= FieldSelectableInt(self
.spr
, tuple(range(30,32)))
156 def __init__(self
, init
=0):
157 self
.spr
= SelectableInt(init
, 24)
158 # SVP64 RM fields: see https://libre-soc.org/openpower/sv/svp64/
159 self
.mmode
= FieldSelectableInt(self
.spr
, [0])
160 self
.mask
= FieldSelectableInt(self
.spr
, tuple(range(1,4)))
161 self
.elwidth
= FieldSelectableInt(self
.spr
, tuple(range(4,6)))
162 self
.ewsrc
= FieldSelectableInt(self
.spr
, tuple(range(6,8)))
163 self
.subvl
= FieldSelectableInt(self
.spr
, tuple(range(8,10)))
164 self
.extra
= FieldSelectableInt(self
.spr
, tuple(range(10,19)))
165 self
.mode
= FieldSelectableInt(self
.spr
, tuple(range(19,24)))
166 # these cover the same extra field, split into parts as EXTRA2
167 self
.extra2
= list(range(4))
168 self
.extra2
[0] = FieldSelectableInt(self
.spr
, tuple(range(10,12)))
169 self
.extra2
[1] = FieldSelectableInt(self
.spr
, tuple(range(12,14)))
170 self
.extra2
[2] = FieldSelectableInt(self
.spr
, tuple(range(14,16)))
171 self
.extra2
[3] = FieldSelectableInt(self
.spr
, tuple(range(16,18)))
172 self
.smask
= FieldSelectableInt(self
.spr
, tuple(range(16,19)))
173 # and here as well, but EXTRA3
174 self
.extra3
= list(range(3))
175 self
.extra3
[0] = FieldSelectableInt(self
.spr
, tuple(range(10,13)))
176 self
.extra3
[1] = FieldSelectableInt(self
.spr
, tuple(range(13,16)))
177 self
.extra3
[2] = FieldSelectableInt(self
.spr
, tuple(range(16,19)))
180 SVP64RM_MMODE_SIZE
= len(SVP64RMFields().mmode
.br
)
181 SVP64RM_MASK_SIZE
= len(SVP64RMFields().mask
.br
)
182 SVP64RM_ELWIDTH_SIZE
= len(SVP64RMFields().elwidth
.br
)
183 SVP64RM_EWSRC_SIZE
= len(SVP64RMFields().ewsrc
.br
)
184 SVP64RM_SUBVL_SIZE
= len(SVP64RMFields().subvl
.br
)
185 SVP64RM_EXTRA2_SPEC_SIZE
= len(SVP64RMFields().extra2
[0].br
)
186 SVP64RM_EXTRA3_SPEC_SIZE
= len(SVP64RMFields().extra3
[0].br
)
187 SVP64RM_SMASK_SIZE
= len(SVP64RMFields().smask
.br
)
188 SVP64RM_MODE_SIZE
= len(SVP64RMFields().mode
.br
)
191 # SVP64 Prefix fields: see https://libre-soc.org/openpower/sv/svp64/
192 class SVP64PrefixFields
:
194 self
.insn
= SelectableInt(0, 32)
195 # 6 bit major opcode EXT001, 2 bits "identifying" (7, 9), 24 SV ReMap
196 self
.major
= FieldSelectableInt(self
.insn
, tuple(range(0,6)))
197 self
.pid
= FieldSelectableInt(self
.insn
, (7, 9)) # must be 0b11
198 rmfields
= [6, 8] + list(range(10,32)) # SVP64 24-bit RM (ReMap)
199 self
.rm
= FieldSelectableInt(self
.insn
, rmfields
)
202 SV64P_MAJOR_SIZE
= len(SVP64PrefixFields().major
.br
)
203 SV64P_PID_SIZE
= len(SVP64PrefixFields().pid
.br
)
204 SV64P_RM_SIZE
= len(SVP64PrefixFields().rm
.br
)
208 def __init__(self
, dec2
, initial_sprs
={}):
211 for key
, v
in initial_sprs
.items():
212 if isinstance(key
, SelectableInt
):
214 key
= special_sprs
.get(key
, key
)
215 if isinstance(key
, int):
218 info
= spr_byname
[key
]
219 if not isinstance(v
, SelectableInt
):
220 v
= SelectableInt(v
, info
.length
)
223 def __getitem__(self
, key
):
224 print("get spr", key
)
225 print("dict", self
.items())
226 # if key in special_sprs get the special spr, otherwise return key
227 if isinstance(key
, SelectableInt
):
229 if isinstance(key
, int):
230 key
= spr_dict
[key
].SPR
231 key
= special_sprs
.get(key
, key
)
232 if key
== 'HSRR0': # HACK!
234 if key
== 'HSRR1': # HACK!
237 res
= dict.__getitem
__(self
, key
)
239 if isinstance(key
, int):
242 info
= spr_byname
[key
]
243 dict.__setitem
__(self
, key
, SelectableInt(0, info
.length
))
244 res
= dict.__getitem
__(self
, key
)
245 print("spr returning", key
, res
)
248 def __setitem__(self
, key
, value
):
249 if isinstance(key
, SelectableInt
):
251 if isinstance(key
, int):
252 key
= spr_dict
[key
].SPR
253 print("spr key", key
)
254 key
= special_sprs
.get(key
, key
)
255 if key
== 'HSRR0': # HACK!
256 self
.__setitem
__('SRR0', value
)
257 if key
== 'HSRR1': # HACK!
258 self
.__setitem
__('SRR1', value
)
259 print("setting spr", key
, value
)
260 dict.__setitem
__(self
, key
, value
)
262 def __call__(self
, ridx
):
265 def get_pdecode_idx_in(dec2
, name
):
267 in1_sel
= yield op
.in1_sel
268 in2_sel
= yield op
.in2_sel
269 in3_sel
= yield op
.in3_sel
270 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
271 in1
= yield dec2
.e
.read_reg1
.data
272 in2
= yield dec2
.e
.read_reg2
.data
273 in3
= yield dec2
.e
.read_reg3
.data
274 in1_isvec
= yield dec2
.in1_isvec
275 in2_isvec
= yield dec2
.in2_isvec
276 in3_isvec
= yield dec2
.in3_isvec
277 print ("get_pdecode_idx", in1_sel
, In1Sel
.RA
.value
, in1
, in1_isvec
)
278 # identify which regnames map to in1/2/3
280 if (in1_sel
== In1Sel
.RA
.value
or
281 (in1_sel
== In1Sel
.RA_OR_ZERO
.value
and in1
!= 0)):
282 return in1
, in1_isvec
283 if in1_sel
== In1Sel
.RA_OR_ZERO
.value
:
284 return in1
, in1_isvec
286 if in2_sel
== In2Sel
.RB
.value
:
287 return in2
, in2_isvec
288 if in3_sel
== In3Sel
.RB
.value
:
289 return in3
, in3_isvec
290 # XXX TODO, RC doesn't exist yet!
292 assert False, "RC does not exist yet"
294 if in1_sel
== In1Sel
.RS
.value
:
295 return in1
, in1_isvec
296 if in2_sel
== In2Sel
.RS
.value
:
297 return in2
, in2_isvec
298 if in3_sel
== In3Sel
.RS
.value
:
299 return in3
, in3_isvec
303 def get_pdecode_cr_out(dec2
, name
):
305 out_sel
= yield op
.cr_out
306 out_bitfield
= yield dec2
.dec_cr_out
.cr_bitfield
.data
307 sv_cr_out
= yield op
.sv_cr_out
308 spec
= yield dec2
.crout_svdec
.spec
309 sv_override
= yield dec2
.dec_cr_out
.sv_override
310 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
311 out
= yield dec2
.e
.write_cr
.data
312 o_isvec
= yield dec2
.o_isvec
313 print ("get_pdecode_cr_out", out_sel
, CROutSel
.CR0
.value
, out
, o_isvec
)
314 print (" sv_cr_out", sv_cr_out
)
315 print (" cr_bf", out_bitfield
)
316 print (" spec", spec
)
317 print (" override", sv_override
)
318 # identify which regnames map to out / o2
320 if out_sel
== CROutSel
.CR0
.value
:
322 print ("get_pdecode_idx_out not found", name
)
326 def get_pdecode_idx_out(dec2
, name
):
328 out_sel
= yield op
.out_sel
329 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
330 out
= yield dec2
.e
.write_reg
.data
331 o_isvec
= yield dec2
.o_isvec
332 print ("get_pdecode_idx_out", out_sel
, OutSel
.RA
.value
, out
, o_isvec
)
333 # identify which regnames map to out / o2
335 if out_sel
== OutSel
.RA
.value
:
338 if out_sel
== OutSel
.RT
.value
:
340 print ("get_pdecode_idx_out not found", name
)
345 def get_pdecode_idx_out2(dec2
, name
):
347 print ("TODO: get_pdecode_idx_out2", name
)
352 # decoder2 - an instance of power_decoder2
353 # regfile - a list of initial values for the registers
354 # initial_{etc} - initial values for SPRs, Condition Register, Mem, MSR
355 # respect_pc - tracks the program counter. requires initial_insns
356 def __init__(self
, decoder2
, regfile
, initial_sprs
=None, initial_cr
=0,
357 initial_mem
=None, initial_msr
=0,
359 initial_insns
=None, respect_pc
=False,
365 self
.bigendian
= bigendian
367 self
.is_svp64_mode
= False
368 self
.respect_pc
= respect_pc
369 if initial_sprs
is None:
371 if initial_mem
is None:
373 if initial_insns
is None:
375 assert self
.respect_pc
== False, "instructions required to honor pc"
377 print("ISACaller insns", respect_pc
, initial_insns
, disassembly
)
378 print("ISACaller initial_msr", initial_msr
)
380 # "fake program counter" mode (for unit testing)
384 if isinstance(initial_mem
, tuple):
385 self
.fake_pc
= initial_mem
[0]
386 disasm_start
= self
.fake_pc
388 disasm_start
= initial_pc
390 # disassembly: we need this for now (not given from the decoder)
391 self
.disassembly
= {}
393 for i
, code
in enumerate(disassembly
):
394 self
.disassembly
[i
*4 + disasm_start
] = code
396 # set up registers, instruction memory, data memory, PC, SPRs, MSR
397 self
.svp64rm
= SVP64RM()
398 if isinstance(initial_svstate
, int):
399 initial_svstate
= SVP64State(initial_svstate
)
400 self
.svstate
= initial_svstate
401 self
.gpr
= GPR(decoder2
, self
, self
.svstate
, regfile
)
402 self
.spr
= SPR(decoder2
, initial_sprs
) # initialise SPRs before MMU
403 self
.mem
= Mem(row_bytes
=8, initial_mem
=initial_mem
)
405 self
.mem
= RADIX(self
.mem
, self
)
406 self
.imem
= Mem(row_bytes
=4, initial_mem
=initial_insns
)
408 self
.msr
= SelectableInt(initial_msr
, 64) # underlying reg
411 # FPR (same as GPR except for FP nums)
412 # 4.2.2 p124 FPSCR (definitely "separate" - not in SPR)
413 # note that mffs, mcrfs, mtfsf "manage" this FPSCR
414 # 2.3.1 CR (and sub-fields CR0..CR6 - CR0 SO comes from XER.SO)
415 # note that mfocrf, mfcr, mtcr, mtocrf, mcrxrx "manage" CRs
417 # 2.3.2 LR (actually SPR #8) -- Done
418 # 2.3.3 CTR (actually SPR #9) -- Done
419 # 2.3.4 TAR (actually SPR #815)
420 # 3.2.2 p45 XER (actually SPR #1) -- Done
421 # 3.2.3 p46 p232 VRSAVE (actually SPR #256)
423 # create CR then allow portions of it to be "selectable" (below)
424 #rev_cr = int('{:016b}'.format(initial_cr)[::-1], 2)
425 self
.cr
= SelectableInt(initial_cr
, 64) # underlying reg
426 #self.cr = FieldSelectableInt(self._cr, list(range(32, 64)))
428 # "undefined", just set to variable-bit-width int (use exts "max")
429 #self.undefined = SelectableInt(0, 256) # TODO, not hard-code 256!
432 self
.namespace
.update(self
.spr
)
433 self
.namespace
.update({'GPR': self
.gpr
,
436 'memassign': self
.memassign
,
441 'undefined': undefined
,
442 'mode_is_64bit': True,
446 # update pc to requested start point
447 self
.set_pc(initial_pc
)
449 # field-selectable versions of Condition Register TODO check bitranges?
452 bits
= tuple(range(i
*4+32, (i
+1)*4+32)) # errr... maybe?
453 _cr
= FieldSelectableInt(self
.cr
, bits
)
455 self
.namespace
["CR%d" % i
] = _cr
457 self
.decoder
= decoder2
.dec
460 def TRAP(self
, trap_addr
=0x700, trap_bit
=PIb
.TRAP
):
461 print("TRAP:", hex(trap_addr
), hex(self
.namespace
['MSR'].value
))
462 # store CIA(+4?) in SRR0, set NIA to 0x700
463 # store MSR in SRR1, set MSR to um errr something, have to check spec
464 self
.spr
['SRR0'].value
= self
.pc
.CIA
.value
465 self
.spr
['SRR1'].value
= self
.namespace
['MSR'].value
466 self
.trap_nia
= SelectableInt(trap_addr
, 64)
467 self
.spr
['SRR1'][trap_bit
] = 1 # change *copy* of MSR in SRR1
469 # set exception bits. TODO: this should, based on the address
470 # in figure 66 p1065 V3.0B and the table figure 65 p1063 set these
471 # bits appropriately. however it turns out that *for now* in all
472 # cases (all trap_addrs) the exact same thing is needed.
473 self
.msr
[MSRb
.IR
] = 0
474 self
.msr
[MSRb
.DR
] = 0
475 self
.msr
[MSRb
.FE0
] = 0
476 self
.msr
[MSRb
.FE1
] = 0
477 self
.msr
[MSRb
.EE
] = 0
478 self
.msr
[MSRb
.RI
] = 0
479 self
.msr
[MSRb
.SF
] = 1
480 self
.msr
[MSRb
.TM
] = 0
481 self
.msr
[MSRb
.VEC
] = 0
482 self
.msr
[MSRb
.VSX
] = 0
483 self
.msr
[MSRb
.PR
] = 0
484 self
.msr
[MSRb
.FP
] = 0
485 self
.msr
[MSRb
.PMM
] = 0
486 self
.msr
[MSRb
.TEs
] = 0
487 self
.msr
[MSRb
.TEe
] = 0
488 self
.msr
[MSRb
.UND
] = 0
489 self
.msr
[MSRb
.LE
] = 1
491 def memassign(self
, ea
, sz
, val
):
492 self
.mem
.memassign(ea
, sz
, val
)
494 def prep_namespace(self
, formname
, op_fields
):
495 # TODO: get field names from form in decoder*1* (not decoder2)
496 # decoder2 is hand-created, and decoder1.sigform is auto-generated
498 # then "yield" fields only from op_fields rather than hard-coded
500 fields
= self
.decoder
.sigforms
[formname
]
501 for name
in op_fields
:
503 sig
= getattr(fields
, name
.upper())
505 sig
= getattr(fields
, name
)
507 # these are all opcode fields involved in index-selection of CR,
508 # and need to do "standard" arithmetic. CR[BA+32] for example
509 # would, if using SelectableInt, only be 5-bit.
510 if name
in ['BF', 'BFA', 'BC', 'BA', 'BB', 'BT', 'BI']:
511 self
.namespace
[name
] = val
513 self
.namespace
[name
] = SelectableInt(val
, sig
.width
)
515 self
.namespace
['XER'] = self
.spr
['XER']
516 self
.namespace
['CA'] = self
.spr
['XER'][XER_bits
['CA']].value
517 self
.namespace
['CA32'] = self
.spr
['XER'][XER_bits
['CA32']].value
519 def handle_carry_(self
, inputs
, outputs
, already_done
):
520 inv_a
= yield self
.dec2
.e
.do
.invert_in
522 inputs
[0] = ~inputs
[0]
524 imm_ok
= yield self
.dec2
.e
.do
.imm_data
.ok
526 imm
= yield self
.dec2
.e
.do
.imm_data
.data
527 inputs
.append(SelectableInt(imm
, 64))
528 assert len(outputs
) >= 1
529 print("outputs", repr(outputs
))
530 if isinstance(outputs
, list) or isinstance(outputs
, tuple):
536 print("gt input", x
, output
)
537 gt
= (gtu(x
, output
))
540 cy
= 1 if any(gts
) else 0
542 if not (1 & already_done
):
543 self
.spr
['XER'][XER_bits
['CA']] = cy
545 print("inputs", already_done
, inputs
)
547 # ARGH... different for OP_ADD... *sigh*...
548 op
= yield self
.dec2
.e
.do
.insn_type
549 if op
== MicrOp
.OP_ADD
.value
:
550 res32
= (output
.value
& (1 << 32)) != 0
551 a32
= (inputs
[0].value
& (1 << 32)) != 0
553 b32
= (inputs
[1].value
& (1 << 32)) != 0
556 cy32
= res32 ^ a32 ^ b32
557 print("CA32 ADD", cy32
)
561 print("input", x
, output
)
562 print(" x[32:64]", x
, x
[32:64])
563 print(" o[32:64]", output
, output
[32:64])
564 gt
= (gtu(x
[32:64], output
[32:64])) == SelectableInt(1, 1)
566 cy32
= 1 if any(gts
) else 0
567 print("CA32", cy32
, gts
)
568 if not (2 & already_done
):
569 self
.spr
['XER'][XER_bits
['CA32']] = cy32
571 def handle_overflow(self
, inputs
, outputs
, div_overflow
):
572 if hasattr(self
.dec2
.e
.do
, "invert_in"):
573 inv_a
= yield self
.dec2
.e
.do
.invert_in
575 inputs
[0] = ~inputs
[0]
577 imm_ok
= yield self
.dec2
.e
.do
.imm_data
.ok
579 imm
= yield self
.dec2
.e
.do
.imm_data
.data
580 inputs
.append(SelectableInt(imm
, 64))
581 assert len(outputs
) >= 1
582 print("handle_overflow", inputs
, outputs
, div_overflow
)
583 if len(inputs
) < 2 and div_overflow
is None:
586 # div overflow is different: it's returned by the pseudo-code
587 # because it's more complex than can be done by analysing the output
588 if div_overflow
is not None:
589 ov
, ov32
= div_overflow
, div_overflow
590 # arithmetic overflow can be done by analysing the input and output
591 elif len(inputs
) >= 2:
595 input_sgn
= [exts(x
.value
, x
.bits
) < 0 for x
in inputs
]
596 output_sgn
= exts(output
.value
, output
.bits
) < 0
597 ov
= 1 if input_sgn
[0] == input_sgn
[1] and \
598 output_sgn
!= input_sgn
[0] else 0
601 input32_sgn
= [exts(x
.value
, 32) < 0 for x
in inputs
]
602 output32_sgn
= exts(output
.value
, 32) < 0
603 ov32
= 1 if input32_sgn
[0] == input32_sgn
[1] and \
604 output32_sgn
!= input32_sgn
[0] else 0
606 self
.spr
['XER'][XER_bits
['OV']] = ov
607 self
.spr
['XER'][XER_bits
['OV32']] = ov32
608 so
= self
.spr
['XER'][XER_bits
['SO']]
610 self
.spr
['XER'][XER_bits
['SO']] = so
612 def handle_comparison(self
, outputs
, cr_idx
=0):
614 assert isinstance(out
, SelectableInt
), \
615 "out zero not a SelectableInt %s" % repr(outputs
)
616 print("handle_comparison", out
.bits
, hex(out
.value
))
617 # TODO - XXX *processor* in 32-bit mode
618 # https://bugs.libre-soc.org/show_bug.cgi?id=424
620 # o32 = exts(out.value, 32)
621 # print ("handle_comparison exts 32 bit", hex(o32))
622 out
= exts(out
.value
, out
.bits
)
623 print("handle_comparison exts", hex(out
))
624 zero
= SelectableInt(out
== 0, 1)
625 positive
= SelectableInt(out
> 0, 1)
626 negative
= SelectableInt(out
< 0, 1)
627 SO
= self
.spr
['XER'][XER_bits
['SO']]
628 print("handle_comparison SO", SO
)
629 cr_field
= selectconcat(negative
, positive
, zero
, SO
)
630 self
.crl
[cr_idx
].eq(cr_field
)
632 def set_pc(self
, pc_val
):
633 self
.namespace
['NIA'] = SelectableInt(pc_val
, 64)
634 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
637 """set up one instruction
640 pc
= self
.pc
.CIA
.value
644 ins
= self
.imem
.ld(pc
, 4, False, True)
646 raise KeyError("no instruction at 0x%x" % pc
)
647 print("setup: 0x%x 0x%x %s" % (pc
, ins
& 0xffffffff, bin(ins
)))
648 print("CIA NIA", self
.respect_pc
, self
.pc
.CIA
.value
, self
.pc
.NIA
.value
)
650 yield self
.dec2
.sv_rm
.eq(0)
651 yield self
.dec2
.dec
.raw_opcode_in
.eq(ins
& 0xffffffff)
652 yield self
.dec2
.dec
.bigendian
.eq(self
.bigendian
)
653 yield self
.dec2
.state
.msr
.eq(self
.msr
.value
)
654 yield self
.dec2
.state
.pc
.eq(pc
)
655 if self
.svstate
is not None:
656 yield self
.dec2
.state
.svstate
.eq(self
.svstate
.spr
.value
)
658 # SVP64. first, check if the opcode is EXT001, and SVP64 id bits set
660 opcode
= yield self
.dec2
.dec
.opcode_in
661 pfx
= SVP64PrefixFields() # TODO should probably use SVP64PrefixDecoder
662 pfx
.insn
.value
= opcode
663 major
= pfx
.major
.asint(msb0
=True) # MSB0 inversion
664 print ("prefix test: opcode:", major
, bin(major
),
665 pfx
.insn
[7] == 0b1, pfx
.insn
[9] == 0b1)
666 self
.is_svp64_mode
= ((major
== 0b000001) and
667 pfx
.insn
[7].value
== 0b1 and
668 pfx
.insn
[9].value
== 0b1)
669 self
.pc
.update_nia(self
.is_svp64_mode
)
670 self
.namespace
['NIA'] = self
.pc
.NIA
671 if not self
.is_svp64_mode
:
674 # in SVP64 mode. decode/print out svp64 prefix, get v3.0B instruction
675 print ("svp64.rm", bin(pfx
.rm
.asint(msb0
=True)))
676 print (" svstate.vl", self
.svstate
.vl
.asint(msb0
=True))
677 print (" svstate.mvl", self
.svstate
.maxvl
.asint(msb0
=True))
678 sv_rm
= pfx
.rm
.asint(msb0
=True)
679 ins
= self
.imem
.ld(pc
+4, 4, False, True)
680 print(" svsetup: 0x%x 0x%x %s" % (pc
+4, ins
& 0xffffffff, bin(ins
)))
681 yield self
.dec2
.dec
.raw_opcode_in
.eq(ins
& 0xffffffff) # v3.0B suffix
682 yield self
.dec2
.sv_rm
.eq(sv_rm
) # svp64 prefix
685 def execute_one(self
):
686 """execute one instruction
688 # get the disassembly code for this instruction
689 if self
.is_svp64_mode
:
690 code
= self
.disassembly
[self
._pc
+4]
691 print(" svp64 sim-execute", hex(self
._pc
), code
)
693 code
= self
.disassembly
[self
._pc
]
694 print("sim-execute", hex(self
._pc
), code
)
695 opname
= code
.split(' ')[0]
696 yield from self
.call(opname
)
698 # don't use this except in special circumstances
699 if not self
.respect_pc
:
702 print("execute one, CIA NIA", self
.pc
.CIA
.value
, self
.pc
.NIA
.value
)
704 def get_assembly_name(self
):
705 # TODO, asmregs is from the spec, e.g. add RT,RA,RB
706 # see http://bugs.libre-riscv.org/show_bug.cgi?id=282
707 dec_insn
= yield self
.dec2
.e
.do
.insn
708 asmcode
= yield self
.dec2
.dec
.op
.asmcode
709 print("get assembly name asmcode", asmcode
, hex(dec_insn
))
710 asmop
= insns
.get(asmcode
, None)
711 int_op
= yield self
.dec2
.dec
.op
.internal_op
713 # sigh reconstruct the assembly instruction name
714 if hasattr(self
.dec2
.e
.do
, "oe"):
715 ov_en
= yield self
.dec2
.e
.do
.oe
.oe
716 ov_ok
= yield self
.dec2
.e
.do
.oe
.ok
720 if hasattr(self
.dec2
.e
.do
, "rc"):
721 rc_en
= yield self
.dec2
.e
.do
.rc
.rc
722 rc_ok
= yield self
.dec2
.e
.do
.rc
.ok
726 # grrrr have to special-case MUL op (see DecodeOE)
727 print("ov %d en %d rc %d en %d op %d" %
728 (ov_ok
, ov_en
, rc_ok
, rc_en
, int_op
))
729 if int_op
in [MicrOp
.OP_MUL_H64
.value
, MicrOp
.OP_MUL_H32
.value
]:
734 if not asmop
.endswith("."): # don't add "." to "andis."
737 if hasattr(self
.dec2
.e
.do
, "lk"):
738 lk
= yield self
.dec2
.e
.do
.lk
741 print("int_op", int_op
)
742 if int_op
in [MicrOp
.OP_B
.value
, MicrOp
.OP_BC
.value
]:
743 AA
= yield self
.dec2
.dec
.fields
.FormI
.AA
[0:-1]
747 spr_msb
= yield from self
.get_spr_msb()
748 if int_op
== MicrOp
.OP_MFCR
.value
:
753 # XXX TODO: for whatever weird reason this doesn't work
754 # https://bugs.libre-soc.org/show_bug.cgi?id=390
755 if int_op
== MicrOp
.OP_MTCRF
.value
:
762 def get_spr_msb(self
):
763 dec_insn
= yield self
.dec2
.e
.do
.insn
764 return dec_insn
& (1 << 20) != 0 # sigh - XFF.spr[-1]?
766 def call(self
, name
):
767 """call(opcode) - the primary execution point for instructions
769 name
= name
.strip() # remove spaces if not already done so
771 print("halted - not executing", name
)
774 # TODO, asmregs is from the spec, e.g. add RT,RA,RB
775 # see http://bugs.libre-riscv.org/show_bug.cgi?id=282
776 asmop
= yield from self
.get_assembly_name()
777 print("call", name
, asmop
)
780 int_op
= yield self
.dec2
.dec
.op
.internal_op
781 spr_msb
= yield from self
.get_spr_msb()
783 instr_is_privileged
= False
784 if int_op
in [MicrOp
.OP_ATTN
.value
,
785 MicrOp
.OP_MFMSR
.value
,
786 MicrOp
.OP_MTMSR
.value
,
787 MicrOp
.OP_MTMSRD
.value
,
789 MicrOp
.OP_RFID
.value
]:
790 instr_is_privileged
= True
791 if int_op
in [MicrOp
.OP_MFSPR
.value
,
792 MicrOp
.OP_MTSPR
.value
] and spr_msb
:
793 instr_is_privileged
= True
795 print("is priv", instr_is_privileged
, hex(self
.msr
.value
),
797 # check MSR priv bit and whether op is privileged: if so, throw trap
798 if instr_is_privileged
and self
.msr
[MSRb
.PR
] == 1:
799 self
.TRAP(0x700, PIb
.PRIV
)
800 self
.namespace
['NIA'] = self
.trap_nia
801 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
804 # check halted condition
809 # check illegal instruction
811 if name
not in ['mtcrf', 'mtocrf']:
812 illegal
= name
!= asmop
815 print("illegal", name
, asmop
)
816 self
.TRAP(0x700, PIb
.ILLEG
)
817 self
.namespace
['NIA'] = self
.trap_nia
818 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
819 print("name %s != %s - calling ILLEGAL trap, PC: %x" %
820 (name
, asmop
, self
.pc
.CIA
.value
))
823 info
= self
.instrs
[name
]
824 yield from self
.prep_namespace(info
.form
, info
.op_fields
)
826 # preserve order of register names
827 input_names
= create_args(list(info
.read_regs
) +
828 list(info
.uninit_regs
))
831 # get SVP64 entry for the current instruction
832 sv_rm
= self
.svp64rm
.instrs
.get(name
)
833 if sv_rm
is not None:
834 dest_cr
, src_cr
, src_byname
, dest_byname
= decode_extra(sv_rm
)
836 dest_cr
, src_cr
, src_byname
, dest_byname
= False, False, {}, {}
837 print ("sv rm", sv_rm
, dest_cr
, src_cr
, src_byname
, dest_byname
)
839 # VL=0 in SVP64 mode means "do nothing: skip instruction"
840 if self
.is_svp64_mode
and vl
== 0:
841 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
842 print("end of call", self
.namespace
['CIA'], self
.namespace
['NIA'])
845 # main input registers (RT, RA ...)
847 for name
in input_names
:
848 # using PowerDecoder2, first, find the decoder index.
849 # (mapping name RA RB RC RS to in1, in2, in3)
850 regnum
, is_vec
= yield from get_pdecode_idx_in(self
.dec2
, name
)
852 # doing this is not part of svp64, it's because output
853 # registers, to be modified, need to be in the namespace.
854 regnum
, is_vec
= yield from get_pdecode_idx_out(self
.dec2
, name
)
856 # in case getting the register number is needed, _RA, _RB
858 self
.namespace
[regname
] = regnum
859 print('reading reg %s %d' % (name
, regnum
), is_vec
)
860 reg_val
= self
.gpr(regnum
)
861 inputs
.append(reg_val
)
863 # "special" registers
864 for special
in info
.special_regs
:
865 if special
in special_sprs
:
866 inputs
.append(self
.spr
[special
])
868 inputs
.append(self
.namespace
[special
])
870 # clear trap (trap) NIA
873 print("inputs", inputs
)
874 results
= info
.func(self
, *inputs
)
875 print("results", results
)
877 # "inject" decorator takes namespace from function locals: we need to
878 # overwrite NIA being overwritten (sigh)
879 if self
.trap_nia
is not None:
880 self
.namespace
['NIA'] = self
.trap_nia
882 print("after func", self
.namespace
['CIA'], self
.namespace
['NIA'])
884 # detect if CA/CA32 already in outputs (sra*, basically)
887 output_names
= create_args(info
.write_regs
)
888 for name
in output_names
:
894 print("carry already done?", bin(already_done
))
895 if hasattr(self
.dec2
.e
.do
, "output_carry"):
896 carry_en
= yield self
.dec2
.e
.do
.output_carry
900 yield from self
.handle_carry_(inputs
, results
, already_done
)
902 # detect if overflow was in return result
905 for name
, output
in zip(output_names
, results
):
906 if name
== 'overflow':
909 if hasattr(self
.dec2
.e
.do
, "oe"):
910 ov_en
= yield self
.dec2
.e
.do
.oe
.oe
911 ov_ok
= yield self
.dec2
.e
.do
.oe
.ok
915 print("internal overflow", overflow
, ov_en
, ov_ok
)
917 yield from self
.handle_overflow(inputs
, results
, overflow
)
919 if hasattr(self
.dec2
.e
.do
, "rc"):
920 rc_en
= yield self
.dec2
.e
.do
.rc
.rc
924 regnum
, is_vec
= yield from get_pdecode_cr_out(self
.dec2
, "CR0")
925 self
.handle_comparison(results
, regnum
)
927 # any modified return results?
929 for name
, output
in zip(output_names
, results
):
930 if name
== 'overflow': # ignore, done already (above)
932 if isinstance(output
, int):
933 output
= SelectableInt(output
, 256)
934 if name
in ['CA', 'CA32']:
936 print("writing %s to XER" % name
, output
)
937 self
.spr
['XER'][XER_bits
[name
]] = output
.value
939 print("NOT writing %s to XER" % name
, output
)
940 elif name
in info
.special_regs
:
941 print('writing special %s' % name
, output
, special_sprs
)
942 if name
in special_sprs
:
943 self
.spr
[name
] = output
945 self
.namespace
[name
].eq(output
)
947 print('msr written', hex(self
.msr
.value
))
949 regnum
, is_vec
= yield from get_pdecode_idx_out(self
.dec2
,
952 # temporary hack for not having 2nd output
953 regnum
= yield getattr(self
.decoder
, name
)
955 print('writing reg %d %s' % (regnum
, str(output
)), is_vec
)
957 output
= SelectableInt(output
.value
, 64)
958 self
.gpr
[regnum
] = output
960 # check if it is the SVSTATE.src/dest step that needs incrementing
961 # this is our Sub-Program-Counter loop from 0 to VL-1
962 if self
.is_svp64_mode
:
963 # XXX twin predication TODO
964 vl
= self
.svstate
.vl
.asint(msb0
=True)
965 mvl
= self
.svstate
.maxvl
.asint(msb0
=True)
966 srcstep
= self
.svstate
.srcstep
.asint(msb0
=True)
967 print (" svstate.vl", vl
)
968 print (" svstate.mvl", mvl
)
969 print (" svstate.srcstep", srcstep
)
970 # check if srcstep needs incrementing by one, stop PC advancing
971 # svp64 loop can end early if the dest is scalar
972 svp64_dest_vector
= not (yield self
.dec2
.no_out_vec
)
973 if svp64_dest_vector
and srcstep
!= vl
-1:
974 self
.svstate
.srcstep
+= SelectableInt(1, 7)
975 self
.pc
.NIA
.value
= self
.pc
.CIA
.value
976 self
.namespace
['NIA'] = self
.pc
.NIA
977 print("end of sub-pc call", self
.namespace
['CIA'],
978 self
.namespace
['NIA'])
979 return # DO NOT allow PC to update whilst Sub-PC loop running
981 self
.svstate
.srcstep
[0:7] = 0
982 print (" svstate.srcstep loop end (PC to update)")
983 self
.pc
.update_nia(self
.is_svp64_mode
)
984 self
.namespace
['NIA'] = self
.pc
.NIA
986 # UPDATE program counter
987 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
988 print("end of call", self
.namespace
['CIA'], self
.namespace
['NIA'])
992 """Decorator factory.
994 this decorator will "inject" variables into the function's namespace,
995 from the *dictionary* in self.namespace. it therefore becomes possible
996 to make it look like a whole stack of variables which would otherwise
997 need "self." inserted in front of them (*and* for those variables to be
998 added to the instance) "appear" in the function.
1000 "self.namespace['SI']" for example becomes accessible as just "SI" but
1001 *only* inside the function, when decorated.
1003 def variable_injector(func
):
1005 def decorator(*args
, **kwargs
):
1007 func_globals
= func
.__globals
__ # Python 2.6+
1008 except AttributeError:
1009 func_globals
= func
.func_globals
# Earlier versions.
1011 context
= args
[0].namespace
# variables to be injected
1012 saved_values
= func_globals
.copy() # Shallow copy of dict.
1013 func_globals
.update(context
)
1014 result
= func(*args
, **kwargs
)
1015 print("globals after", func_globals
['CIA'], func_globals
['NIA'])
1016 print("args[0]", args
[0].namespace
['CIA'],
1017 args
[0].namespace
['NIA'])
1018 args
[0].namespace
= func_globals
1019 #exec (func.__code__, func_globals)
1022 # func_globals = saved_values # Undo changes.
1028 return variable_injector