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
17 from nmigen
.back
.pysim
import Settle
18 from functools
import wraps
19 from copy
import copy
, deepcopy
20 from openpower
.decoder
.orderedset
import OrderedSet
21 from openpower
.decoder
.selectable_int
import (
27 from openpower
.decoder
.power_enums
import (spr_dict
, spr_byname
, XER_bits
,
29 In1Sel
, In2Sel
, In3Sel
,
30 OutSel
, CRInSel
, CROutSel
, LDSTMode
,
31 SVP64RMMode
, SVP64PredMode
,
32 SVP64PredInt
, SVP64PredCR
,
35 from openpower
.decoder
.power_enums
import SVPtype
37 from openpower
.decoder
.helpers
import (exts
, gtu
, ltu
, undefined
,
38 ISACallerHelper
, ISAFPHelpers
)
39 from openpower
.consts
import PIb
, MSRb
# big-endian (PowerISA versions)
40 from openpower
.consts
import (SVP64MODE
,
43 from openpower
.decoder
.power_svp64
import SVP64RM
, decode_extra
45 from openpower
.decoder
.isa
.radixmmu
import RADIX
46 from openpower
.decoder
.isa
.mem
import Mem
, swap_order
, MemException
47 from openpower
.decoder
.isa
.svshape
import SVSHAPE
48 from openpower
.decoder
.isa
.svstate
import SVP64State
51 from openpower
.util
import log
53 from collections
import namedtuple
57 instruction_info
= namedtuple('instruction_info',
58 'func read_regs uninit_regs write_regs ' +
59 'special_regs op_fields form asmregs')
70 # TODO (lkcl): adjust other registers that should be in a particular order
71 # probably CA, CA32, and CR
97 "overflow": 7, # should definitely be last
100 fregs
= ['FRA', 'FRB', 'FRC', 'FRS', 'FRT']
103 def create_args(reglist
, extra
=None):
104 retval
= list(OrderedSet(reglist
))
105 retval
.sort(key
=lambda reg
: REG_SORT_ORDER
.get(reg
, 0))
106 if extra
is not None:
107 return [extra
] + retval
112 def __init__(self
, decoder
, isacaller
, svstate
, regfile
):
115 self
.isacaller
= isacaller
116 self
.svstate
= svstate
117 for i
in range(len(regfile
)):
118 self
[i
] = SelectableInt(regfile
[i
], 64)
120 def __call__(self
, ridx
):
121 if isinstance(ridx
, SelectableInt
):
125 def set_form(self
, form
):
128 def __setitem__(self
, rnum
, value
):
129 # rnum = rnum.value # only SelectableInt allowed
130 log("GPR setitem", rnum
, value
)
131 if isinstance(rnum
, SelectableInt
):
133 dict.__setitem
__(self
, rnum
, value
)
135 def getz(self
, rnum
):
136 # rnum = rnum.value # only SelectableInt allowed
137 log("GPR getzero?", rnum
)
139 return SelectableInt(0, 64)
142 def _get_regnum(self
, attr
):
143 getform
= self
.sd
.sigforms
[self
.form
]
144 rnum
= getattr(getform
, attr
)
147 def ___getitem__(self
, attr
):
148 """ XXX currently not used
150 rnum
= self
._get
_regnum
(attr
)
151 log("GPR getitem", attr
, rnum
)
152 return self
.regfile
[rnum
]
154 def dump(self
, printout
=True):
156 for i
in range(len(self
)):
157 res
.append(self
[i
].value
)
159 for i
in range(0, len(res
), 8):
162 s
.append("%08x" % res
[i
+j
])
164 print("reg", "%2d" % i
, s
)
169 def __init__(self
, dec2
, initial_sprs
={}):
172 for key
, v
in initial_sprs
.items():
173 if isinstance(key
, SelectableInt
):
175 key
= special_sprs
.get(key
, key
)
176 if isinstance(key
, int):
179 info
= spr_byname
[key
]
180 if not isinstance(v
, SelectableInt
):
181 v
= SelectableInt(v
, info
.length
)
184 def __getitem__(self
, key
):
186 log("dict", self
.items())
187 # if key in special_sprs get the special spr, otherwise return key
188 if isinstance(key
, SelectableInt
):
190 if isinstance(key
, int):
191 key
= spr_dict
[key
].SPR
192 key
= special_sprs
.get(key
, key
)
193 if key
== 'HSRR0': # HACK!
195 if key
== 'HSRR1': # HACK!
198 res
= dict.__getitem
__(self
, key
)
200 if isinstance(key
, int):
203 info
= spr_byname
[key
]
204 dict.__setitem
__(self
, key
, SelectableInt(0, info
.length
))
205 res
= dict.__getitem
__(self
, key
)
206 log("spr returning", key
, res
)
209 def __setitem__(self
, key
, value
):
210 if isinstance(key
, SelectableInt
):
212 if isinstance(key
, int):
213 key
= spr_dict
[key
].SPR
215 key
= special_sprs
.get(key
, key
)
216 if key
== 'HSRR0': # HACK!
217 self
.__setitem
__('SRR0', value
)
218 if key
== 'HSRR1': # HACK!
219 self
.__setitem
__('SRR1', value
)
220 log("setting spr", key
, value
)
221 dict.__setitem
__(self
, key
, value
)
223 def __call__(self
, ridx
):
226 def dump(self
, printout
=True):
228 keys
= list(self
.keys())
231 sprname
= spr_dict
.get(k
, None)
235 sprname
= sprname
.SPR
236 res
.append((sprname
, self
[k
].value
))
238 for sprname
, value
in res
:
239 print(" ", sprname
, hex(value
))
244 def __init__(self
, pc_init
=0):
245 self
.CIA
= SelectableInt(pc_init
, 64)
246 self
.NIA
= self
.CIA
+ SelectableInt(4, 64) # only true for v3.0B!
248 def update_nia(self
, is_svp64
):
249 increment
= 8 if is_svp64
else 4
250 self
.NIA
= self
.CIA
+ SelectableInt(increment
, 64)
252 def update(self
, namespace
, is_svp64
):
253 """updates the program counter (PC) by 4 if v3.0B mode or 8 if SVP64
255 self
.CIA
= namespace
['NIA'].narrow(64)
256 self
.update_nia(is_svp64
)
257 namespace
['CIA'] = self
.CIA
258 namespace
['NIA'] = self
.NIA
262 class SVP64RMFields(SelectableIntMapping
, bits
=24, fields
={
264 # SVP64 RM fields: see https://libre-soc.org/openpower/sv/svp64/
267 "elwidth": range(4, 6),
268 "ewsrc": range(6, 8),
269 "subvl": range(8, 10),
270 "extra": range(10, 19),
271 "mode": range(19, 24),
272 # these cover the same extra field, split into parts as EXTRA2
273 "extra2": dict(enumerate([
279 "smask": range(16, 19),
280 # and here as well, but EXTRA3
281 "extra3": dict(enumerate([
288 def __init__(self
, value
=0):
289 super().__init
__(value
=value
)
293 SVP64RM_MMODE_SIZE
= len(SVP64RMFields
.mmode
)
294 SVP64RM_MASK_SIZE
= len(SVP64RMFields
.mask
)
295 SVP64RM_ELWIDTH_SIZE
= len(SVP64RMFields
.elwidth
)
296 SVP64RM_EWSRC_SIZE
= len(SVP64RMFields
.ewsrc
)
297 SVP64RM_SUBVL_SIZE
= len(SVP64RMFields
.subvl
)
298 SVP64RM_EXTRA2_SPEC_SIZE
= len(SVP64RMFields
.extra2
[0])
299 SVP64RM_EXTRA3_SPEC_SIZE
= len(SVP64RMFields
.extra3
[0])
300 SVP64RM_SMASK_SIZE
= len(SVP64RMFields
.smask
)
301 SVP64RM_MODE_SIZE
= len(SVP64RMFields
.mode
)
304 # SVP64 Prefix fields: see https://libre-soc.org/openpower/sv/svp64/
305 class SVP64PrefixFields(SelectableIntMapping
, bits
=32, fields
={
307 # 6 bit major opcode EXT001, 2 bits "identifying" (7, 9), 24 SV ReMap
308 "major": range(0, 6),
310 # SVP64 24-bit RM (ReMap)
311 "rm": ((6, 8) + tuple(range(10, 32))),
314 def __init__(self
, value
=0):
315 super().__init
__(value
=value
)
319 SV64P_MAJOR_SIZE
= len(SVP64PrefixFields
.major
)
320 SV64P_PID_SIZE
= len(SVP64PrefixFields
.pid
)
321 SV64P_RM_SIZE
= len(SVP64PrefixFields
.rm
)
325 # See PowerISA Version 3.0 B Book 1
326 # Section 2.3.1 Condition Register pages 30 - 31
328 LT
= FL
= 0 # negative, less than, floating-point less than
329 GT
= FG
= 1 # positive, greater than, floating-point greater than
330 EQ
= FE
= 2 # equal, floating-point equal
331 SO
= FU
= 3 # summary overflow, floating-point unordered
333 def __init__(self
, init
=0):
334 # rev_cr = int('{:016b}'.format(initial_cr)[::-1], 2)
335 # self.cr = FieldSelectableInt(self._cr, list(range(32, 64)))
336 self
.cr
= SelectableInt(init
, 64) # underlying reg
337 # field-selectable versions of Condition Register TODO check bitranges?
340 bits
= tuple(range(i
*4+32, (i
+1)*4+32))
341 _cr
= FieldSelectableInt(self
.cr
, bits
)
344 # decode SVP64 predicate integer to reg number and invert
347 def get_predint(gpr
, mask
):
350 log("get_predint", mask
, SVP64PredInt
.ALWAYS
.value
)
351 if mask
== SVP64PredInt
.ALWAYS
.value
:
352 return 0xffff_ffff_ffff_ffff # 64 bits of 1
353 if mask
== SVP64PredInt
.R3_UNARY
.value
:
354 return 1 << (gpr(3).value
& 0b111111)
355 if mask
== SVP64PredInt
.R3
.value
:
357 if mask
== SVP64PredInt
.R3_N
.value
:
359 if mask
== SVP64PredInt
.R10
.value
:
361 if mask
== SVP64PredInt
.R10_N
.value
:
362 return ~
gpr(10).value
363 if mask
== SVP64PredInt
.R30
.value
:
365 if mask
== SVP64PredInt
.R30_N
.value
:
366 return ~
gpr(30).value
368 # decode SVP64 predicate CR to reg number and invert status
371 def _get_predcr(mask
):
372 if mask
== SVP64PredCR
.LT
.value
:
374 if mask
== SVP64PredCR
.GE
.value
:
376 if mask
== SVP64PredCR
.GT
.value
:
378 if mask
== SVP64PredCR
.LE
.value
:
380 if mask
== SVP64PredCR
.EQ
.value
:
382 if mask
== SVP64PredCR
.NE
.value
:
384 if mask
== SVP64PredCR
.SO
.value
:
386 if mask
== SVP64PredCR
.NS
.value
:
389 # read individual CR fields (0..VL-1), extract the required bit
390 # and construct the mask
393 def get_predcr(crl
, mask
, vl
):
394 idx
, noninv
= _get_predcr(mask
)
397 cr
= crl
[i
+SVP64CROffs
.CRPred
]
398 if cr
[idx
].value
== noninv
:
403 # TODO, really should just be using PowerDecoder2
404 def get_pdecode_idx_in(dec2
, name
):
406 in1_sel
= yield op
.in1_sel
407 in2_sel
= yield op
.in2_sel
408 in3_sel
= yield op
.in3_sel
409 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
410 in1
= yield dec2
.e
.read_reg1
.data
411 in2
= yield dec2
.e
.read_reg2
.data
412 in3
= yield dec2
.e
.read_reg3
.data
413 in1_isvec
= yield dec2
.in1_isvec
414 in2_isvec
= yield dec2
.in2_isvec
415 in3_isvec
= yield dec2
.in3_isvec
416 log("get_pdecode_idx_in in1", name
, in1_sel
, In1Sel
.RA
.value
,
418 log("get_pdecode_idx_in in2", name
, in2_sel
, In2Sel
.RB
.value
,
420 log("get_pdecode_idx_in in3", name
, in3_sel
, In3Sel
.RS
.value
,
422 log("get_pdecode_idx_in FRS in3", name
, in3_sel
, In3Sel
.FRS
.value
,
424 log("get_pdecode_idx_in FRB in2", name
, in2_sel
, In2Sel
.FRB
.value
,
426 log("get_pdecode_idx_in FRC in3", name
, in3_sel
, In3Sel
.FRC
.value
,
428 # identify which regnames map to in1/2/3
430 if (in1_sel
== In1Sel
.RA
.value
or
431 (in1_sel
== In1Sel
.RA_OR_ZERO
.value
and in1
!= 0)):
432 return in1
, in1_isvec
433 if in1_sel
== In1Sel
.RA_OR_ZERO
.value
:
434 return in1
, in1_isvec
436 if in2_sel
== In2Sel
.RB
.value
:
437 return in2
, in2_isvec
438 if in3_sel
== In3Sel
.RB
.value
:
439 return in3
, in3_isvec
440 # XXX TODO, RC doesn't exist yet!
442 assert False, "RC does not exist yet"
444 if in1_sel
== In1Sel
.RS
.value
:
445 return in1
, in1_isvec
446 if in2_sel
== In2Sel
.RS
.value
:
447 return in2
, in2_isvec
448 if in3_sel
== In3Sel
.RS
.value
:
449 return in3
, in3_isvec
451 if in1_sel
== In1Sel
.FRA
.value
:
452 return in1
, in1_isvec
454 if in2_sel
== In2Sel
.FRB
.value
:
455 return in2
, in2_isvec
457 if in3_sel
== In3Sel
.FRC
.value
:
458 return in3
, in3_isvec
460 if in1_sel
== In1Sel
.FRS
.value
:
461 return in1
, in1_isvec
462 if in3_sel
== In3Sel
.FRS
.value
:
463 return in3
, in3_isvec
467 # TODO, really should just be using PowerDecoder2
468 def get_pdecode_cr_in(dec2
, name
):
470 in_sel
= yield op
.cr_in
471 in_bitfield
= yield dec2
.dec_cr_in
.cr_bitfield
.data
472 sv_cr_in
= yield op
.sv_cr_in
473 spec
= yield dec2
.crin_svdec
.spec
474 sv_override
= yield dec2
.dec_cr_in
.sv_override
475 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
476 in1
= yield dec2
.e
.read_cr1
.data
477 cr_isvec
= yield dec2
.cr_in_isvec
478 log("get_pdecode_cr_in", in_sel
, CROutSel
.CR0
.value
, in1
, cr_isvec
)
479 log(" sv_cr_in", sv_cr_in
)
480 log(" cr_bf", in_bitfield
)
482 log(" override", sv_override
)
483 # identify which regnames map to in / o2
485 if in_sel
== CRInSel
.BI
.value
:
487 log("get_pdecode_cr_in not found", name
)
491 # TODO, really should just be using PowerDecoder2
492 def get_pdecode_cr_out(dec2
, name
):
494 out_sel
= yield op
.cr_out
495 out_bitfield
= yield dec2
.dec_cr_out
.cr_bitfield
.data
496 sv_cr_out
= yield op
.sv_cr_out
497 spec
= yield dec2
.crout_svdec
.spec
498 sv_override
= yield dec2
.dec_cr_out
.sv_override
499 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
500 out
= yield dec2
.e
.write_cr
.data
501 o_isvec
= yield dec2
.o_isvec
502 log("get_pdecode_cr_out", out_sel
, CROutSel
.CR0
.value
, out
, o_isvec
)
503 log(" sv_cr_out", sv_cr_out
)
504 log(" cr_bf", out_bitfield
)
506 log(" override", sv_override
)
507 # identify which regnames map to out / o2
509 if out_sel
== CROutSel
.CR0
.value
:
511 log("get_pdecode_cr_out not found", name
)
515 # TODO, really should just be using PowerDecoder2
516 def get_pdecode_idx_out(dec2
, name
):
518 out_sel
= yield op
.out_sel
519 # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
520 out
= yield dec2
.e
.write_reg
.data
521 o_isvec
= yield dec2
.o_isvec
522 # identify which regnames map to out / o2
524 log("get_pdecode_idx_out", out_sel
, OutSel
.RA
.value
, out
, o_isvec
)
525 if out_sel
== OutSel
.RA
.value
:
528 log("get_pdecode_idx_out", out_sel
, OutSel
.RT
.value
,
529 OutSel
.RT_OR_ZERO
.value
, out
, o_isvec
,
531 if out_sel
== OutSel
.RT
.value
:
533 elif name
== 'RT_OR_ZERO':
534 log("get_pdecode_idx_out", out_sel
, OutSel
.RT
.value
,
535 OutSel
.RT_OR_ZERO
.value
, out
, o_isvec
,
537 if out_sel
== OutSel
.RT_OR_ZERO
.value
:
540 log("get_pdecode_idx_out", out_sel
, OutSel
.FRA
.value
, out
, o_isvec
)
541 if out_sel
== OutSel
.FRA
.value
:
544 log("get_pdecode_idx_out", out_sel
, OutSel
.FRT
.value
,
545 OutSel
.FRT
.value
, out
, o_isvec
)
546 if out_sel
== OutSel
.FRT
.value
:
548 log("get_pdecode_idx_out not found", name
, out_sel
, out
, o_isvec
)
552 # TODO, really should just be using PowerDecoder2
553 def get_pdecode_idx_out2(dec2
, name
):
554 # check first if register is activated for write
556 out_sel
= yield op
.out_sel
557 out
= yield dec2
.e
.write_ea
.data
558 o_isvec
= yield dec2
.o2_isvec
559 out_ok
= yield dec2
.e
.write_ea
.ok
560 log("get_pdecode_idx_out2", name
, out_sel
, out
, out_ok
, o_isvec
)
565 if hasattr(op
, "upd"):
566 # update mode LD/ST uses read-reg A also as an output
568 log("get_pdecode_idx_out2", upd
, LDSTMode
.update
.value
,
569 out_sel
, OutSel
.RA
.value
,
571 if upd
== LDSTMode
.update
.value
:
574 int_op
= yield dec2
.dec
.op
.internal_op
575 fft_en
= yield dec2
.use_svp64_fft
576 # if int_op == MicrOp.OP_FP_MADD.value and fft_en:
578 log("get_pdecode_idx_out2", out_sel
, OutSel
.FRS
.value
,
584 class ISACaller(ISACallerHelper
, ISAFPHelpers
):
585 # decoder2 - an instance of power_decoder2
586 # regfile - a list of initial values for the registers
587 # initial_{etc} - initial values for SPRs, Condition Register, Mem, MSR
588 # respect_pc - tracks the program counter. requires initial_insns
589 def __init__(self
, decoder2
, regfile
, initial_sprs
=None, initial_cr
=0,
590 initial_mem
=None, initial_msr
=0,
601 self
.bigendian
= bigendian
603 self
.is_svp64_mode
= False
604 self
.respect_pc
= respect_pc
605 if initial_sprs
is None:
607 if initial_mem
is None:
609 if fpregfile
is None:
611 if initial_insns
is None:
613 assert self
.respect_pc
== False, "instructions required to honor pc"
615 log("ISACaller insns", respect_pc
, initial_insns
, disassembly
)
616 log("ISACaller initial_msr", initial_msr
)
618 # "fake program counter" mode (for unit testing)
622 if isinstance(initial_mem
, tuple):
623 self
.fake_pc
= initial_mem
[0]
624 disasm_start
= self
.fake_pc
626 disasm_start
= initial_pc
628 # disassembly: we need this for now (not given from the decoder)
629 self
.disassembly
= {}
631 for i
, code
in enumerate(disassembly
):
632 self
.disassembly
[i
*4 + disasm_start
] = code
634 # set up registers, instruction memory, data memory, PC, SPRs, MSR, CR
635 self
.svp64rm
= SVP64RM()
636 if initial_svstate
is None:
638 if isinstance(initial_svstate
, int):
639 initial_svstate
= SVP64State(initial_svstate
)
640 # SVSTATE, MSR and PC
641 self
.svstate
= initial_svstate
642 self
.msr
= SelectableInt(initial_msr
, 64) # underlying reg
644 # GPR FPR SPR registers
645 initial_sprs
= deepcopy(initial_sprs
) # so as not to get modified
646 self
.gpr
= GPR(decoder2
, self
, self
.svstate
, regfile
)
647 self
.fpr
= GPR(decoder2
, self
, self
.svstate
, fpregfile
)
648 self
.spr
= SPR(decoder2
, initial_sprs
) # initialise SPRs before MMU
650 # set up 4 dummy SVSHAPEs if they aren't already set up
652 sname
= 'SVSHAPE%d' % i
653 if sname
not in self
.spr
:
656 val
= self
.spr
[sname
].value
657 # make sure it's an SVSHAPE
658 self
.spr
[sname
] = SVSHAPE(val
, self
.gpr
)
659 self
.last_op_svshape
= False
662 self
.mem
= Mem(row_bytes
=8, initial_mem
=initial_mem
)
663 self
.imem
= Mem(row_bytes
=4, initial_mem
=initial_insns
)
664 # MMU mode, redirect underlying Mem through RADIX
666 self
.mem
= RADIX(self
.mem
, self
)
668 self
.imem
= RADIX(self
.imem
, self
)
671 # FPR (same as GPR except for FP nums)
672 # 4.2.2 p124 FPSCR (definitely "separate" - not in SPR)
673 # note that mffs, mcrfs, mtfsf "manage" this FPSCR
674 # 2.3.1 CR (and sub-fields CR0..CR6 - CR0 SO comes from XER.SO)
675 # note that mfocrf, mfcr, mtcr, mtocrf, mcrxrx "manage" CRs
677 # 2.3.2 LR (actually SPR #8) -- Done
678 # 2.3.3 CTR (actually SPR #9) -- Done
679 # 2.3.4 TAR (actually SPR #815)
680 # 3.2.2 p45 XER (actually SPR #1) -- Done
681 # 3.2.3 p46 p232 VRSAVE (actually SPR #256)
683 # create CR then allow portions of it to be "selectable" (below)
684 self
.cr_fields
= CRFields(initial_cr
)
685 self
.cr
= self
.cr_fields
.cr
687 # "undefined", just set to variable-bit-width int (use exts "max")
688 # self.undefined = SelectableInt(0, 256) # TODO, not hard-code 256!
691 self
.namespace
.update(self
.spr
)
692 self
.namespace
.update({'GPR': self
.gpr
,
696 'memassign': self
.memassign
,
699 'SVSTATE': self
.svstate
,
700 'SVSHAPE0': self
.spr
['SVSHAPE0'],
701 'SVSHAPE1': self
.spr
['SVSHAPE1'],
702 'SVSHAPE2': self
.spr
['SVSHAPE2'],
703 'SVSHAPE3': self
.spr
['SVSHAPE3'],
706 'undefined': undefined
,
707 'mode_is_64bit': True,
708 'SO': XER_bits
['SO'],
709 'XLEN': 64 # elwidth overrides, later
712 # update pc to requested start point
713 self
.set_pc(initial_pc
)
715 # field-selectable versions of Condition Register
716 self
.crl
= self
.cr_fields
.crl
718 self
.namespace
["CR%d" % i
] = self
.crl
[i
]
720 self
.decoder
= decoder2
.dec
723 super().__init
__(XLEN
=self
.namespace
["XLEN"])
727 return self
.namespace
["XLEN"]
729 def call_trap(self
, trap_addr
, trap_bit
):
730 """calls TRAP and sets up NIA to the new execution location.
731 next instruction will begin at trap_addr.
733 self
.TRAP(trap_addr
, trap_bit
)
734 self
.namespace
['NIA'] = self
.trap_nia
735 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
737 def TRAP(self
, trap_addr
=0x700, trap_bit
=PIb
.TRAP
):
738 """TRAP> saves PC, MSR (and TODO SVSTATE), and updates MSR
740 TRAP function is callable from inside the pseudocode itself,
741 hence the default arguments. when calling from inside ISACaller
742 it is best to use call_trap()
744 # https://bugs.libre-soc.org/show_bug.cgi?id=859
745 kaivb
= self
.spr
['KAIVB'].value
746 msr
= self
.namespace
['MSR'].value
747 log("TRAP:", hex(trap_addr
), hex(msr
), "kaivb", hex(kaivb
))
748 # store CIA(+4?) in SRR0, set NIA to 0x700
749 # store MSR in SRR1, set MSR to um errr something, have to check spec
750 # store SVSTATE (if enabled) in SVSRR0
751 self
.spr
['SRR0'].value
= self
.pc
.CIA
.value
752 self
.spr
['SRR1'].value
= msr
753 if self
.is_svp64_mode
:
754 self
.spr
['SVSRR0'] = self
.namespace
['SVSTATE'].value
755 self
.trap_nia
= SelectableInt(trap_addr |
(kaivb
&~
0x1fff), 64)
756 self
.spr
['SRR1'][trap_bit
] = 1 # change *copy* of MSR in SRR1
758 # set exception bits. TODO: this should, based on the address
759 # in figure 66 p1065 V3.0B and the table figure 65 p1063 set these
760 # bits appropriately. however it turns out that *for now* in all
761 # cases (all trap_addrs) the exact same thing is needed.
762 self
.msr
[MSRb
.IR
] = 0
763 self
.msr
[MSRb
.DR
] = 0
764 self
.msr
[MSRb
.FE0
] = 0
765 self
.msr
[MSRb
.FE1
] = 0
766 self
.msr
[MSRb
.EE
] = 0
767 self
.msr
[MSRb
.RI
] = 0
768 self
.msr
[MSRb
.SF
] = 1
769 self
.msr
[MSRb
.TM
] = 0
770 self
.msr
[MSRb
.VEC
] = 0
771 self
.msr
[MSRb
.VSX
] = 0
772 self
.msr
[MSRb
.PR
] = 0
773 self
.msr
[MSRb
.FP
] = 0
774 self
.msr
[MSRb
.PMM
] = 0
775 self
.msr
[MSRb
.TEs
] = 0
776 self
.msr
[MSRb
.TEe
] = 0
777 self
.msr
[MSRb
.UND
] = 0
778 self
.msr
[MSRb
.LE
] = 1
780 def memassign(self
, ea
, sz
, val
):
781 self
.mem
.memassign(ea
, sz
, val
)
783 def prep_namespace(self
, insn_name
, formname
, op_fields
):
784 # TODO: get field names from form in decoder*1* (not decoder2)
785 # decoder2 is hand-created, and decoder1.sigform is auto-generated
787 # then "yield" fields only from op_fields rather than hard-coded
789 fields
= self
.decoder
.sigforms
[formname
]
790 log("prep_namespace", formname
, op_fields
)
791 for name
in op_fields
:
792 # CR immediates. deal with separately. needs modifying
794 if self
.is_svp64_mode
and name
in ['BI']: # TODO, more CRs
795 # BI is a 5-bit, must reconstruct the value
796 regnum
, is_vec
= yield from get_pdecode_cr_in(self
.dec2
, name
)
797 sig
= getattr(fields
, name
)
799 # low 2 LSBs (CR field selector) remain same, CR num extended
800 assert regnum
<= 7, "sigh, TODO, 128 CR fields"
801 val
= (val
& 0b11) |
(regnum
<< 2)
804 sig
= getattr(fields
, name
.upper())
806 sig
= getattr(fields
, name
)
808 # these are all opcode fields involved in index-selection of CR,
809 # and need to do "standard" arithmetic. CR[BA+32] for example
810 # would, if using SelectableInt, only be 5-bit.
811 if name
in ['BF', 'BFA', 'BC', 'BA', 'BB', 'BT', 'BI']:
812 self
.namespace
[name
] = val
814 self
.namespace
[name
] = SelectableInt(val
, sig
.width
)
816 self
.namespace
['XER'] = self
.spr
['XER']
817 self
.namespace
['CA'] = self
.spr
['XER'][XER_bits
['CA']].value
818 self
.namespace
['CA32'] = self
.spr
['XER'][XER_bits
['CA32']].value
820 # add some SVSTATE convenience variables
822 srcstep
= self
.svstate
.srcstep
823 self
.namespace
['VL'] = vl
824 self
.namespace
['srcstep'] = srcstep
826 # sv.bc* need some extra fields
827 if self
.is_svp64_mode
and insn_name
.startswith("sv.bc"):
828 # blegh grab bits manually
829 mode
= yield self
.dec2
.rm_dec
.rm_in
.mode
830 bc_vlset
= (mode
& SVP64MODE
.BC_VLSET
) != 0
831 bc_vli
= (mode
& SVP64MODE
.BC_VLI
) != 0
832 bc_snz
= (mode
& SVP64MODE
.BC_SNZ
) != 0
833 bc_vsb
= yield self
.dec2
.rm_dec
.bc_vsb
834 bc_lru
= yield self
.dec2
.rm_dec
.bc_lru
835 bc_gate
= yield self
.dec2
.rm_dec
.bc_gate
836 sz
= yield self
.dec2
.rm_dec
.pred_sz
837 self
.namespace
['ALL'] = SelectableInt(bc_gate
, 1)
838 self
.namespace
['VSb'] = SelectableInt(bc_vsb
, 1)
839 self
.namespace
['LRu'] = SelectableInt(bc_lru
, 1)
840 self
.namespace
['VLSET'] = SelectableInt(bc_vlset
, 1)
841 self
.namespace
['VLI'] = SelectableInt(bc_vli
, 1)
842 self
.namespace
['sz'] = SelectableInt(sz
, 1)
843 self
.namespace
['SNZ'] = SelectableInt(bc_snz
, 1)
845 def handle_carry_(self
, inputs
, outputs
, already_done
):
846 inv_a
= yield self
.dec2
.e
.do
.invert_in
848 inputs
[0] = ~inputs
[0]
850 imm_ok
= yield self
.dec2
.e
.do
.imm_data
.ok
852 imm
= yield self
.dec2
.e
.do
.imm_data
.data
853 inputs
.append(SelectableInt(imm
, 64))
854 assert len(outputs
) >= 1
855 log("outputs", repr(outputs
))
856 if isinstance(outputs
, list) or isinstance(outputs
, tuple):
862 log("gt input", x
, output
)
863 gt
= (gtu(x
, output
))
866 cy
= 1 if any(gts
) else 0
868 if not (1 & already_done
):
869 self
.spr
['XER'][XER_bits
['CA']] = cy
871 log("inputs", already_done
, inputs
)
873 # ARGH... different for OP_ADD... *sigh*...
874 op
= yield self
.dec2
.e
.do
.insn_type
875 if op
== MicrOp
.OP_ADD
.value
:
876 res32
= (output
.value
& (1 << 32)) != 0
877 a32
= (inputs
[0].value
& (1 << 32)) != 0
879 b32
= (inputs
[1].value
& (1 << 32)) != 0
882 cy32
= res32 ^ a32 ^ b32
883 log("CA32 ADD", cy32
)
887 log("input", x
, output
)
888 log(" x[32:64]", x
, x
[32:64])
889 log(" o[32:64]", output
, output
[32:64])
890 gt
= (gtu(x
[32:64], output
[32:64])) == SelectableInt(1, 1)
892 cy32
= 1 if any(gts
) else 0
893 log("CA32", cy32
, gts
)
894 if not (2 & already_done
):
895 self
.spr
['XER'][XER_bits
['CA32']] = cy32
897 def handle_overflow(self
, inputs
, outputs
, div_overflow
):
898 if hasattr(self
.dec2
.e
.do
, "invert_in"):
899 inv_a
= yield self
.dec2
.e
.do
.invert_in
901 inputs
[0] = ~inputs
[0]
903 imm_ok
= yield self
.dec2
.e
.do
.imm_data
.ok
905 imm
= yield self
.dec2
.e
.do
.imm_data
.data
906 inputs
.append(SelectableInt(imm
, 64))
907 assert len(outputs
) >= 1
908 log("handle_overflow", inputs
, outputs
, div_overflow
)
909 if len(inputs
) < 2 and div_overflow
is None:
912 # div overflow is different: it's returned by the pseudo-code
913 # because it's more complex than can be done by analysing the output
914 if div_overflow
is not None:
915 ov
, ov32
= div_overflow
, div_overflow
916 # arithmetic overflow can be done by analysing the input and output
917 elif len(inputs
) >= 2:
921 input_sgn
= [exts(x
.value
, x
.bits
) < 0 for x
in inputs
]
922 output_sgn
= exts(output
.value
, output
.bits
) < 0
923 ov
= 1 if input_sgn
[0] == input_sgn
[1] and \
924 output_sgn
!= input_sgn
[0] else 0
927 input32_sgn
= [exts(x
.value
, 32) < 0 for x
in inputs
]
928 output32_sgn
= exts(output
.value
, 32) < 0
929 ov32
= 1 if input32_sgn
[0] == input32_sgn
[1] and \
930 output32_sgn
!= input32_sgn
[0] else 0
932 self
.spr
['XER'][XER_bits
['OV']] = ov
933 self
.spr
['XER'][XER_bits
['OV32']] = ov32
934 so
= self
.spr
['XER'][XER_bits
['SO']]
936 self
.spr
['XER'][XER_bits
['SO']] = so
938 def handle_comparison(self
, outputs
, cr_idx
=0):
940 assert isinstance(out
, SelectableInt
), \
941 "out zero not a SelectableInt %s" % repr(outputs
)
942 log("handle_comparison", out
.bits
, hex(out
.value
))
943 # TODO - XXX *processor* in 32-bit mode
944 # https://bugs.libre-soc.org/show_bug.cgi?id=424
946 # o32 = exts(out.value, 32)
947 # print ("handle_comparison exts 32 bit", hex(o32))
948 out
= exts(out
.value
, out
.bits
)
949 log("handle_comparison exts", hex(out
))
950 zero
= SelectableInt(out
== 0, 1)
951 positive
= SelectableInt(out
> 0, 1)
952 negative
= SelectableInt(out
< 0, 1)
953 SO
= self
.spr
['XER'][XER_bits
['SO']]
954 log("handle_comparison SO", SO
)
955 cr_field
= selectconcat(negative
, positive
, zero
, SO
)
956 log("handle_comparison cr_field", self
.cr
, cr_idx
, cr_field
)
957 self
.crl
[cr_idx
].eq(cr_field
)
959 def set_pc(self
, pc_val
):
960 self
.namespace
['NIA'] = SelectableInt(pc_val
, 64)
961 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
963 def get_next_insn(self
):
967 pc
= self
.pc
.CIA
.value
970 ins
= self
.imem
.ld(pc
, 4, False, True, instr_fetch
=True)
972 raise KeyError("no instruction at 0x%x" % pc
)
976 """set up one instruction
978 pc
, insn
= self
.get_next_insn()
979 yield from self
.setup_next_insn(pc
, insn
)
981 def setup_next_insn(self
, pc
, ins
):
982 """set up next instruction
985 log("setup: 0x%x 0x%x %s" % (pc
, ins
& 0xffffffff, bin(ins
)))
986 log("CIA NIA", self
.respect_pc
, self
.pc
.CIA
.value
, self
.pc
.NIA
.value
)
988 yield self
.dec2
.sv_rm
.eq(0)
989 yield self
.dec2
.dec
.raw_opcode_in
.eq(ins
& 0xffffffff)
990 yield self
.dec2
.dec
.bigendian
.eq(self
.bigendian
)
991 yield self
.dec2
.state
.msr
.eq(self
.msr
.value
)
992 yield self
.dec2
.state
.pc
.eq(pc
)
993 if self
.svstate
is not None:
994 yield self
.dec2
.state
.svstate
.eq(self
.svstate
.value
)
996 # SVP64. first, check if the opcode is EXT001, and SVP64 id bits set
998 opcode
= yield self
.dec2
.dec
.opcode_in
999 pfx
= SVP64PrefixFields() # TODO should probably use SVP64PrefixDecoder
1000 pfx
.insn
.value
= opcode
1001 major
= pfx
.major
.asint(msb0
=True) # MSB0 inversion
1002 log("prefix test: opcode:", major
, bin(major
),
1003 pfx
.insn
[7] == 0b1, pfx
.insn
[9] == 0b1)
1004 self
.is_svp64_mode
= ((major
== 0b000001) and
1005 pfx
.insn
[7].value
== 0b1 and
1006 pfx
.insn
[9].value
== 0b1)
1007 self
.pc
.update_nia(self
.is_svp64_mode
)
1009 yield self
.dec2
.is_svp64_mode
.eq(self
.is_svp64_mode
)
1010 self
.namespace
['NIA'] = self
.pc
.NIA
1011 self
.namespace
['SVSTATE'] = self
.svstate
1012 if not self
.is_svp64_mode
:
1015 # in SVP64 mode. decode/print out svp64 prefix, get v3.0B instruction
1016 log("svp64.rm", bin(pfx
.rm
.asint(msb0
=True)))
1017 log(" svstate.vl", self
.svstate
.vl
)
1018 log(" svstate.mvl", self
.svstate
.maxvl
)
1019 sv_rm
= pfx
.rm
.asint(msb0
=True)
1020 ins
= self
.imem
.ld(pc
+4, 4, False, True, instr_fetch
=True)
1021 log(" svsetup: 0x%x 0x%x %s" % (pc
+4, ins
& 0xffffffff, bin(ins
)))
1022 yield self
.dec2
.dec
.raw_opcode_in
.eq(ins
& 0xffffffff) # v3.0B suffix
1023 yield self
.dec2
.sv_rm
.eq(sv_rm
) # svp64 prefix
1026 def execute_one(self
):
1027 """execute one instruction
1029 # get the disassembly code for this instruction
1030 if self
.is_svp64_mode
:
1031 if not self
.disassembly
:
1032 code
= yield from self
.get_assembly_name()
1034 code
= self
.disassembly
[self
._pc
+4]
1035 log(" svp64 sim-execute", hex(self
._pc
), code
)
1037 if not self
.disassembly
:
1038 code
= yield from self
.get_assembly_name()
1040 code
= self
.disassembly
[self
._pc
]
1041 log("sim-execute", hex(self
._pc
), code
)
1042 opname
= code
.split(' ')[0]
1044 yield from self
.call(opname
) # execute the instruction
1045 except MemException
as e
: # check for memory errors
1046 if e
.args
[0] == 'unaligned': # alignment error
1047 # run a Trap but set DAR first
1048 print("memory unaligned exception, DAR", e
.dar
)
1049 self
.spr
['DAR'] = SelectableInt(e
.dar
, 64)
1050 self
.call_trap(0x600, PIb
.PRIV
) # 0x600, privileged
1052 elif e
.args
[0] == 'invalid': # invalid
1053 # run a Trap but set DAR first
1054 log("RADIX MMU memory invalid error, mode %s" % e
.mode
)
1055 if e
.mode
== 'EXECUTE':
1056 # XXX TODO: must set a few bits in SRR1,
1057 # see microwatt loadstore1.vhdl
1058 # if m_in.segerr = '0' then
1059 # v.srr1(47 - 33) := m_in.invalid;
1060 # v.srr1(47 - 35) := m_in.perm_error; -- noexec fault
1061 # v.srr1(47 - 44) := m_in.badtree;
1062 # v.srr1(47 - 45) := m_in.rc_error;
1063 # v.intr_vec := 16#400#;
1065 # v.intr_vec := 16#480#;
1066 self
.call_trap(0x400, PIb
.PRIV
) # 0x400, privileged
1068 self
.call_trap(0x300, PIb
.PRIV
) # 0x300, privileged
1070 # not supported yet:
1071 raise e
# ... re-raise
1073 # don't use this except in special circumstances
1074 if not self
.respect_pc
:
1077 log("execute one, CIA NIA", hex(self
.pc
.CIA
.value
),
1078 hex(self
.pc
.NIA
.value
))
1080 def get_assembly_name(self
):
1081 # TODO, asmregs is from the spec, e.g. add RT,RA,RB
1082 # see http://bugs.libre-riscv.org/show_bug.cgi?id=282
1083 dec_insn
= yield self
.dec2
.e
.do
.insn
1084 insn_1_11
= yield self
.dec2
.e
.do
.insn
[1:11]
1085 asmcode
= yield self
.dec2
.dec
.op
.asmcode
1086 int_op
= yield self
.dec2
.dec
.op
.internal_op
1087 log("get assembly name asmcode", asmcode
, int_op
,
1088 hex(dec_insn
), bin(insn_1_11
))
1089 asmop
= insns
.get(asmcode
, None)
1091 # sigh reconstruct the assembly instruction name
1092 if hasattr(self
.dec2
.e
.do
, "oe"):
1093 ov_en
= yield self
.dec2
.e
.do
.oe
.oe
1094 ov_ok
= yield self
.dec2
.e
.do
.oe
.ok
1098 if hasattr(self
.dec2
.e
.do
, "rc"):
1099 rc_en
= yield self
.dec2
.e
.do
.rc
.rc
1100 rc_ok
= yield self
.dec2
.e
.do
.rc
.ok
1104 # grrrr have to special-case MUL op (see DecodeOE)
1105 log("ov %d en %d rc %d en %d op %d" %
1106 (ov_ok
, ov_en
, rc_ok
, rc_en
, int_op
))
1107 if int_op
in [MicrOp
.OP_MUL_H64
.value
, MicrOp
.OP_MUL_H32
.value
]:
1112 if not asmop
.endswith("."): # don't add "." to "andis."
1115 if hasattr(self
.dec2
.e
.do
, "lk"):
1116 lk
= yield self
.dec2
.e
.do
.lk
1119 log("int_op", int_op
)
1120 if int_op
in [MicrOp
.OP_B
.value
, MicrOp
.OP_BC
.value
]:
1121 AA
= yield self
.dec2
.dec
.fields
.FormI
.AA
[0:-1]
1125 spr_msb
= yield from self
.get_spr_msb()
1126 if int_op
== MicrOp
.OP_MFCR
.value
:
1131 # XXX TODO: for whatever weird reason this doesn't work
1132 # https://bugs.libre-soc.org/show_bug.cgi?id=390
1133 if int_op
== MicrOp
.OP_MTCRF
.value
:
1140 def get_remap_indices(self
):
1141 """WARNING, this function stores remap_idxs and remap_loopends
1142 in the class for later use. this to avoid problems with yield
1144 # go through all iterators in lock-step, advance to next remap_idx
1145 srcstep
, dststep
, ssubstep
, dsubstep
= self
.get_src_dststeps()
1146 # get four SVSHAPEs. here we are hard-coding
1147 SVSHAPE0
= self
.spr
['SVSHAPE0']
1148 SVSHAPE1
= self
.spr
['SVSHAPE1']
1149 SVSHAPE2
= self
.spr
['SVSHAPE2']
1150 SVSHAPE3
= self
.spr
['SVSHAPE3']
1151 # set up the iterators
1152 remaps
= [(SVSHAPE0
, SVSHAPE0
.get_iterator()),
1153 (SVSHAPE1
, SVSHAPE1
.get_iterator()),
1154 (SVSHAPE2
, SVSHAPE2
.get_iterator()),
1155 (SVSHAPE3
, SVSHAPE3
.get_iterator()),
1158 self
.remap_loopends
= [0] * 4
1159 self
.remap_idxs
= [0, 1, 2, 3]
1161 for i
, (shape
, remap
) in enumerate(remaps
):
1162 # zero is "disabled"
1163 if shape
.value
== 0x0:
1164 self
.remap_idxs
[i
] = 0
1165 # pick src or dststep depending on reg num (0-2=in, 3-4=out)
1166 step
= dststep
if (i
in [3, 4]) else srcstep
1167 # this is terrible. O(N^2) looking for the match. but hey.
1168 for idx
, (remap_idx
, loopends
) in enumerate(remap
):
1171 self
.remap_idxs
[i
] = remap_idx
1172 self
.remap_loopends
[i
] = loopends
1173 dbg
.append((i
, step
, remap_idx
, loopends
))
1174 for (i
, step
, remap_idx
, loopends
) in dbg
:
1175 log("SVSHAPE %d idx, end" % i
, step
, remap_idx
, bin(loopends
))
1178 def get_spr_msb(self
):
1179 dec_insn
= yield self
.dec2
.e
.do
.insn
1180 return dec_insn
& (1 << 20) != 0 # sigh - XFF.spr[-1]?
1182 def call(self
, name
):
1183 """call(opcode) - the primary execution point for instructions
1185 self
.last_st_addr
= None # reset the last known store address
1186 self
.last_ld_addr
= None # etc.
1188 ins_name
= name
.strip() # remove spaces if not already done so
1190 log("halted - not executing", ins_name
)
1193 # TODO, asmregs is from the spec, e.g. add RT,RA,RB
1194 # see http://bugs.libre-riscv.org/show_bug.cgi?id=282
1195 asmop
= yield from self
.get_assembly_name()
1196 log("call", ins_name
, asmop
)
1199 int_op
= yield self
.dec2
.dec
.op
.internal_op
1200 spr_msb
= yield from self
.get_spr_msb()
1202 instr_is_privileged
= False
1203 if int_op
in [MicrOp
.OP_ATTN
.value
,
1204 MicrOp
.OP_MFMSR
.value
,
1205 MicrOp
.OP_MTMSR
.value
,
1206 MicrOp
.OP_MTMSRD
.value
,
1208 MicrOp
.OP_RFID
.value
]:
1209 instr_is_privileged
= True
1210 if int_op
in [MicrOp
.OP_MFSPR
.value
,
1211 MicrOp
.OP_MTSPR
.value
] and spr_msb
:
1212 instr_is_privileged
= True
1214 log("is priv", instr_is_privileged
, hex(self
.msr
.value
),
1216 # check MSR priv bit and whether op is privileged: if so, throw trap
1217 if instr_is_privileged
and self
.msr
[MSRb
.PR
] == 1:
1218 self
.call_trap(0x700, PIb
.PRIV
)
1221 # check halted condition
1222 if ins_name
== 'attn':
1226 # check illegal instruction
1228 if ins_name
not in ['mtcrf', 'mtocrf']:
1229 illegal
= ins_name
!= asmop
1231 # list of instructions not being supported by binutils (.long)
1232 dotstrp
= asmop
[:-1] if asmop
[-1] == '.' else asmop
1233 if dotstrp
in [ 'fsins', 'fcoss',
1234 'ffmadds', 'fdmadds', 'ffadds',
1235 'mins', 'maxs', 'minu', 'maxu',
1236 'setvl', 'svindex', 'svremap', 'svstep', 'svshape',
1237 'grev', 'ternlogi', 'bmask', 'cprop',
1238 'absdu', 'absds', 'absdacs', 'absdacu', 'avgadd',
1243 # branch-conditional redirects to sv.bc
1244 if asmop
.startswith('bc') and self
.is_svp64_mode
:
1245 ins_name
= 'sv.%s' % ins_name
1247 log(" post-processed name", dotstrp
, ins_name
, asmop
)
1249 # illegal instructions call TRAP at 0x700
1251 print("illegal", ins_name
, asmop
)
1252 self
.call_trap(0x700, PIb
.ILLEG
)
1253 print("name %s != %s - calling ILLEGAL trap, PC: %x" %
1254 (ins_name
, asmop
, self
.pc
.CIA
.value
))
1257 # this is for setvl "Vertical" mode: if set true,
1258 # srcstep/dststep is explicitly advanced. mode says which SVSTATE to
1259 # test for Rc=1 end condition. 3 bits of all 3 loops are put into CR0
1260 self
.allow_next_step_inc
= False
1261 self
.svstate_next_mode
= 0
1263 # nop has to be supported, we could let the actual op calculate
1264 # but PowerDecoder has a pattern for nop
1265 if ins_name
is 'nop':
1266 self
.update_pc_next()
1269 # look up instruction in ISA.instrs, prepare namespace
1270 info
= self
.instrs
[ins_name
]
1271 yield from self
.prep_namespace(ins_name
, info
.form
, info
.op_fields
)
1273 # preserve order of register names
1274 input_names
= create_args(list(info
.read_regs
) +
1275 list(info
.uninit_regs
))
1276 log("input names", input_names
)
1278 # get SVP64 entry for the current instruction
1279 sv_rm
= self
.svp64rm
.instrs
.get(ins_name
)
1280 if sv_rm
is not None:
1281 dest_cr
, src_cr
, src_byname
, dest_byname
= decode_extra(sv_rm
)
1283 dest_cr
, src_cr
, src_byname
, dest_byname
= False, False, {}, {}
1284 log("sv rm", sv_rm
, dest_cr
, src_cr
, src_byname
, dest_byname
)
1286 # see if srcstep/dststep need skipping over masked-out predicate bits
1287 if (self
.is_svp64_mode
or ins_name
== 'setvl' or
1288 ins_name
in ['svremap', 'svstate']):
1289 yield from self
.svstate_pre_inc()
1290 if self
.is_svp64_mode
:
1291 pre
= yield from self
.update_new_svstate_steps()
1293 self
.svp64_reset_loop()
1295 self
.update_pc_next()
1297 srcstep
, dststep
, ssubstep
, dsubstep
= self
.get_src_dststeps()
1298 pred_dst_zero
= self
.pred_dst_zero
1299 pred_src_zero
= self
.pred_src_zero
1300 vl
= self
.svstate
.vl
1301 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1303 # VL=0 in SVP64 mode means "do nothing: skip instruction"
1304 if self
.is_svp64_mode
and vl
== 0:
1305 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
1306 log("SVP64: VL=0, end of call", self
.namespace
['CIA'],
1307 self
.namespace
['NIA'])
1310 # for when SVREMAP is active, using pre-arranged schedule.
1311 # note: modifying PowerDecoder2 needs to "settle"
1312 remap_en
= self
.svstate
.SVme
1313 persist
= self
.svstate
.RMpst
1314 active
= (persist
or self
.last_op_svshape
) and remap_en
!= 0
1315 if self
.is_svp64_mode
:
1316 yield self
.dec2
.remap_active
.eq(remap_en
if active
else 0)
1318 if persist
or self
.last_op_svshape
:
1319 remaps
= self
.get_remap_indices()
1320 if self
.is_svp64_mode
and (persist
or self
.last_op_svshape
):
1321 yield from self
.remap_debug(remaps
)
1322 # after that, settle down (combinatorial) to let Vector reg numbers
1323 # work themselves out
1325 if self
.is_svp64_mode
:
1326 remap_active
= yield self
.dec2
.remap_active
1328 remap_active
= False
1329 log("remap active", bin(remap_active
))
1331 # main input registers (RT, RA ...)
1333 for name
in input_names
:
1334 regval
= (yield from self
.get_input(name
))
1335 inputs
.append(regval
)
1337 # arrrrgh, awful hack, to get _RT into namespace
1338 if ins_name
in ['setvl', 'svstep']:
1340 RT
= yield self
.dec2
.dec
.RT
1341 self
.namespace
[regname
] = SelectableInt(RT
, 5)
1343 self
.namespace
["RT"] = SelectableInt(0, 5)
1344 regnum
, is_vec
= yield from get_pdecode_idx_out(self
.dec2
, "RT")
1345 log('hack input reg %s %s' % (name
, str(regnum
)), is_vec
)
1347 # in SVP64 mode for LD/ST work out immediate
1348 # XXX TODO: replace_ds for DS-Form rather than D-Form.
1349 # use info.form to detect
1350 if self
.is_svp64_mode
:
1351 yield from self
.check_replace_d(info
, remap_active
)
1353 # "special" registers
1354 for special
in info
.special_regs
:
1355 if special
in special_sprs
:
1356 inputs
.append(self
.spr
[special
])
1358 inputs
.append(self
.namespace
[special
])
1360 # clear trap (trap) NIA
1361 self
.trap_nia
= None
1363 # check if this was an sv.bc* and create an indicator that
1364 # this is the last check to be made as a loop. combined with
1365 # the ALL/ANY mode we can early-exit
1366 if self
.is_svp64_mode
and ins_name
.startswith("sv.bc"):
1367 no_in_vec
= yield self
.dec2
.no_in_vec
# BI is scalar
1368 end_loop
= no_in_vec
or srcstep
== vl
-1 or dststep
== vl
-1
1369 self
.namespace
['end_loop'] = SelectableInt(end_loop
, 1)
1371 # execute actual instruction here (finally)
1372 log("inputs", inputs
)
1373 results
= info
.func(self
, *inputs
)
1374 log("results", results
)
1376 # "inject" decorator takes namespace from function locals: we need to
1377 # overwrite NIA being overwritten (sigh)
1378 if self
.trap_nia
is not None:
1379 self
.namespace
['NIA'] = self
.trap_nia
1381 log("after func", self
.namespace
['CIA'], self
.namespace
['NIA'])
1383 # check if op was a LD/ST so that debugging can check the
1385 if int_op
in [MicrOp
.OP_STORE
.value
,
1387 self
.last_st_addr
= self
.mem
.last_st_addr
1388 if int_op
in [MicrOp
.OP_LOAD
.value
,
1390 self
.last_ld_addr
= self
.mem
.last_ld_addr
1391 log("op", int_op
, MicrOp
.OP_STORE
.value
, MicrOp
.OP_LOAD
.value
,
1392 self
.last_st_addr
, self
.last_ld_addr
)
1394 # detect if CA/CA32 already in outputs (sra*, basically)
1397 output_names
= create_args(info
.write_regs
)
1398 for name
in output_names
:
1404 log("carry already done?", bin(already_done
))
1405 if hasattr(self
.dec2
.e
.do
, "output_carry"):
1406 carry_en
= yield self
.dec2
.e
.do
.output_carry
1410 yield from self
.handle_carry_(inputs
, results
, already_done
)
1412 if not self
.is_svp64_mode
: # yeah just no. not in parallel processing
1413 # detect if overflow was in return result
1416 for name
, output
in zip(output_names
, results
):
1417 if name
== 'overflow':
1420 if hasattr(self
.dec2
.e
.do
, "oe"):
1421 ov_en
= yield self
.dec2
.e
.do
.oe
.oe
1422 ov_ok
= yield self
.dec2
.e
.do
.oe
.ok
1426 log("internal overflow", overflow
, ov_en
, ov_ok
)
1428 yield from self
.handle_overflow(inputs
, results
, overflow
)
1430 # only do SVP64 dest predicated Rc=1 if dest-pred is not enabled
1432 if not self
.is_svp64_mode
or not pred_dst_zero
:
1433 if hasattr(self
.dec2
.e
.do
, "rc"):
1434 rc_en
= yield self
.dec2
.e
.do
.rc
.rc
1435 if rc_en
and ins_name
not in ['svstep']:
1436 regnum
, is_vec
= yield from get_pdecode_cr_out(self
.dec2
, "CR0")
1437 self
.handle_comparison(results
, regnum
)
1439 # any modified return results?
1441 for name
, output
in zip(output_names
, results
):
1442 yield from self
.check_write(info
, name
, output
)
1444 nia_update
= (yield from self
.check_step_increment(results
, rc_en
,
1447 self
.update_pc_next()
1449 def check_replace_d(self
, info
, remap_active
):
1450 replace_d
= False # update / replace constant in pseudocode
1451 ldstmode
= yield self
.dec2
.rm_dec
.ldstmode
1452 # shift mode reads SVD (or SVDS - TODO)
1453 # *BUT*... because this is "overloading" of LD operations,
1454 # it gets *STORED* into D (or DS, TODO)
1455 if ldstmode
== SVP64LDSTmode
.SHIFT
.value
:
1456 imm
= yield self
.dec2
.dec
.fields
.FormSVD
.SVD
[0:11]
1457 imm
= exts(imm
, 11) # sign-extend to integer
1458 log("shift SVD", imm
)
1461 if info
.form
== 'DS':
1462 # DS-Form, multiply by 4 then knock 2 bits off after
1463 imm
= yield self
.dec2
.dec
.fields
.FormDS
.DS
[0:14] * 4
1465 imm
= yield self
.dec2
.dec
.fields
.FormD
.D
[0:16]
1466 imm
= exts(imm
, 16) # sign-extend to integer
1467 # get the right step. LD is from srcstep, ST is dststep
1468 op
= yield self
.dec2
.e
.do
.insn_type
1470 if op
== MicrOp
.OP_LOAD
.value
:
1472 offsmul
= yield self
.dec2
.in1_step
1473 log("D-field REMAP src", imm
, offsmul
)
1475 offsmul
= (srcstep
* (subvl
+1)) + ssubstep
1476 log("D-field src", imm
, offsmul
)
1477 elif op
== MicrOp
.OP_STORE
.value
:
1478 # XXX NOTE! no bit-reversed STORE! this should not ever be used
1479 offsmul
= (dststep
* (subvl
+1)) + dsubstep
1480 log("D-field dst", imm
, offsmul
)
1481 # bit-reverse mode, rev already done through get_src_dst_steps()
1482 if ldstmode
== SVP64LDSTmode
.SHIFT
.value
:
1483 # manually look up RC, sigh
1484 RC
= yield self
.dec2
.dec
.RC
[0:5]
1486 log("LD-SHIFT:", "VL", vl
,
1487 "RC", RC
.value
, "imm", imm
,
1488 "offs", bin(offsmul
),
1490 imm
= SelectableInt((imm
* offsmul
) << RC
.value
, 32)
1491 # Unit-Strided LD/ST adds offset*width to immediate
1492 elif ldstmode
== SVP64LDSTmode
.UNITSTRIDE
.value
:
1493 ldst_len
= yield self
.dec2
.e
.do
.data_len
1494 imm
= SelectableInt(imm
+ offsmul
* ldst_len
, 32)
1496 # Element-strided multiplies the immediate by element step
1497 elif ldstmode
== SVP64LDSTmode
.ELSTRIDE
.value
:
1498 imm
= SelectableInt(imm
* offsmul
, 32)
1501 ldst_ra_vec
= yield self
.dec2
.rm_dec
.ldst_ra_vec
1502 ldst_imz_in
= yield self
.dec2
.rm_dec
.ldst_imz_in
1503 log("LDSTmode", SVP64LDSTmode(ldstmode
),
1504 offsmul
, imm
, ldst_ra_vec
, ldst_imz_in
)
1505 # new replacement D... errr.. DS
1507 if info
.form
== 'DS':
1508 # TODO: assert 2 LSBs are zero?
1509 log("DS-Form, TODO, assert 2 LSBs zero?", bin(imm
.value
))
1510 imm
.value
= imm
.value
>> 2
1511 self
.namespace
['DS'] = imm
1513 self
.namespace
['D'] = imm
1515 def get_input(self
, name
):
1516 # using PowerDecoder2, first, find the decoder index.
1517 # (mapping name RA RB RC RS to in1, in2, in3)
1518 regnum
, is_vec
= yield from get_pdecode_idx_in(self
.dec2
, name
)
1520 # doing this is not part of svp64, it's because output
1521 # registers, to be modified, need to be in the namespace.
1522 regnum
, is_vec
= yield from get_pdecode_idx_out(self
.dec2
, name
)
1524 regnum
, is_vec
= yield from get_pdecode_idx_out2(self
.dec2
, name
)
1526 # in case getting the register number is needed, _RA, _RB
1527 regname
= "_" + name
1528 self
.namespace
[regname
] = regnum
1529 if not self
.is_svp64_mode
or not self
.pred_src_zero
:
1530 log('reading reg %s %s' % (name
, str(regnum
)), is_vec
)
1532 reg_val
= SelectableInt(self
.fpr(regnum
))
1533 elif name
is not None:
1534 reg_val
= SelectableInt(self
.gpr(regnum
))
1536 log('zero input reg %s %s' % (name
, str(regnum
)), is_vec
)
1540 def remap_debug(self
, remaps
):
1541 # just some convenient debug info
1543 sname
= 'SVSHAPE%d' % i
1544 shape
= self
.spr
[sname
]
1545 log(sname
, bin(shape
.value
))
1546 log(" lims", shape
.lims
)
1547 log(" mode", shape
.mode
)
1548 log(" skip", shape
.skip
)
1550 # set up the list of steps to remap
1551 mi0
= self
.svstate
.mi0
1552 mi1
= self
.svstate
.mi1
1553 mi2
= self
.svstate
.mi2
1554 mo0
= self
.svstate
.mo0
1555 mo1
= self
.svstate
.mo1
1556 steps
= [(self
.dec2
.in1_step
, mi0
), # RA
1557 (self
.dec2
.in2_step
, mi1
), # RB
1558 (self
.dec2
.in3_step
, mi2
), # RC
1559 (self
.dec2
.o_step
, mo0
), # RT
1560 (self
.dec2
.o2_step
, mo1
), # EA
1562 remap_idxs
= self
.remap_idxs
1564 # now cross-index the required SHAPE for each of 3-in 2-out regs
1565 rnames
= ['RA', 'RB', 'RC', 'RT', 'EA']
1566 for i
, (dstep
, shape_idx
) in enumerate(steps
):
1567 (shape
, remap
) = remaps
[shape_idx
]
1568 remap_idx
= remap_idxs
[shape_idx
]
1569 # zero is "disabled"
1570 if shape
.value
== 0x0:
1572 # now set the actual requested step to the current index
1573 yield dstep
.eq(remap_idx
)
1575 # debug printout info
1576 rremaps
.append((shape
.mode
, i
, rnames
[i
], shape_idx
, remap_idx
))
1578 log("shape remap", x
)
1580 def check_write(self
, info
, name
, output
):
1581 if name
== 'overflow': # ignore, done already (above)
1583 if isinstance(output
, int):
1584 output
= SelectableInt(output
, 256)
1585 if name
in ['CA', 'CA32']:
1587 log("writing %s to XER" % name
, output
)
1588 self
.spr
['XER'][XER_bits
[name
]] = output
.value
1590 log("NOT writing %s to XER" % name
, output
)
1591 elif name
in info
.special_regs
:
1592 log('writing special %s' % name
, output
, special_sprs
)
1593 if name
in special_sprs
:
1594 self
.spr
[name
] = output
1596 self
.namespace
[name
].eq(output
)
1598 log('msr written', hex(self
.msr
.value
))
1600 regnum
, is_vec
= yield from get_pdecode_idx_out(self
.dec2
, name
)
1602 regnum
, is_vec
= yield from get_pdecode_idx_out2(
1605 # temporary hack for not having 2nd output
1606 regnum
= yield getattr(self
.decoder
, name
)
1608 if self
.is_svp64_mode
and self
.pred_dst_zero
:
1609 log('zeroing reg %d %s' % (regnum
, str(output
)),
1611 output
= SelectableInt(0, 256)
1617 log('writing %s %s %s' % (ftype
, regnum
, str(output
)),
1619 if output
.bits
> 64:
1620 output
= SelectableInt(output
.value
, 64)
1622 self
.fpr
[regnum
] = output
1624 self
.gpr
[regnum
] = output
1626 def check_step_increment(self
, results
, rc_en
, asmop
, ins_name
):
1627 # check if it is the SVSTATE.src/dest step that needs incrementing
1628 # this is our Sub-Program-Counter loop from 0 to VL-1
1631 if self
.allow_next_step_inc
:
1632 log("SVSTATE_NEXT: inc requested, mode",
1633 self
.svstate_next_mode
, self
.allow_next_step_inc
)
1634 yield from self
.svstate_pre_inc()
1635 pre
= yield from self
.update_new_svstate_steps()
1637 # reset at end of loop including exit Vertical Mode
1638 log("SVSTATE_NEXT: end of loop, reset")
1639 self
.svp64_reset_loop()
1640 self
.svstate
.vfirst
= 0
1644 results
= [SelectableInt(0, 64)]
1645 self
.handle_comparison(results
) # CR0
1647 if self
.allow_next_step_inc
== 2:
1648 log("SVSTATE_NEXT: read")
1649 nia_update
= (yield from self
.svstate_post_inc(ins_name
))
1651 log("SVSTATE_NEXT: post-inc")
1652 # use actual src/dst-step here to check end, do NOT
1653 # use bit-reversed version
1654 srcstep
, dststep
= self
.new_srcstep
, self
.new_dststep
1655 ssubstep
, dsubstep
= self
.new_ssubstep
, self
.new_dsubstep
1656 remaps
= self
.get_remap_indices()
1657 remap_idxs
= self
.remap_idxs
1658 vl
= self
.svstate
.vl
1659 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1660 end_src
= srcstep
== vl
-1
1661 end_dst
= dststep
== vl
-1
1662 if self
.allow_next_step_inc
!= 2:
1663 yield from self
.advance_svstate_steps(end_src
, end_dst
)
1664 self
.namespace
['SVSTATE'] = self
.svstate
.spr
1665 # set CR0 (if Rc=1) based on end
1667 endtest
= 1 if (end_src
or end_dst
) else 0
1668 #results = [SelectableInt(endtest, 64)]
1669 # self.handle_comparison(results) # CR0
1671 # see if svstep was requested, if so, which SVSTATE
1673 if self
.svstate_next_mode
> 0:
1674 shape_idx
= self
.svstate_next_mode
.value
-1
1675 endings
= self
.remap_loopends
[shape_idx
]
1676 cr_field
= SelectableInt((~endings
) << 1 | endtest
, 4)
1677 print("svstep Rc=1, CR0", cr_field
)
1678 self
.crl
[0].eq(cr_field
) # CR0
1679 if end_src
or end_dst
:
1680 # reset at end of loop including exit Vertical Mode
1681 log("SVSTATE_NEXT: after increments, reset")
1682 self
.svp64_reset_loop()
1683 self
.svstate
.vfirst
= 0
1686 if self
.is_svp64_mode
:
1687 return (yield from self
.svstate_post_inc(ins_name
))
1689 # XXX only in non-SVP64 mode!
1690 # record state of whether the current operation was an svshape,
1692 # to be able to know if it should apply in the next instruction.
1693 # also (if going to use this instruction) should disable ability
1694 # to interrupt in between. sigh.
1695 self
.last_op_svshape
= asmop
in ['svremap', 'svindex']
1699 def SVSTATE_NEXT(self
, mode
, submode
):
1700 """explicitly moves srcstep/dststep on to next element, for
1701 "Vertical-First" mode. this function is called from
1702 setvl pseudo-code, as a pseudo-op "svstep"
1704 WARNING: this function uses information that was created EARLIER
1705 due to it being in the middle of a yield, but this function is
1706 *NOT* called from yield (it's called from compiled pseudocode).
1708 self
.allow_next_step_inc
= submode
.value
+ 1
1709 log("SVSTATE_NEXT mode", mode
, submode
, self
.allow_next_step_inc
)
1710 self
.svstate_next_mode
= mode
1711 if self
.svstate_next_mode
> 0 and self
.svstate_next_mode
< 5:
1712 shape_idx
= self
.svstate_next_mode
.value
-1
1713 return SelectableInt(self
.remap_idxs
[shape_idx
], 7)
1714 if self
.svstate_next_mode
== 5:
1715 self
.svstate_next_mode
= 0
1716 return SelectableInt(self
.svstate
.srcstep
, 7)
1717 if self
.svstate_next_mode
== 6:
1718 self
.svstate_next_mode
= 0
1719 return SelectableInt(self
.svstate
.dststep
, 7)
1720 return SelectableInt(0, 7)
1722 def svstate_pre_inc(self
):
1723 """check if srcstep/dststep need to skip over masked-out predicate bits
1724 note that this is not supposed to do anything to substep,
1725 it is purely for skipping masked-out bits
1727 # get SVSTATE VL (oh and print out some debug stuff)
1728 vl
= self
.svstate
.vl
1729 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1730 srcstep
= self
.svstate
.srcstep
1731 dststep
= self
.svstate
.dststep
1732 ssubstep
= self
.svstate
.ssubstep
1733 dsubstep
= self
.svstate
.dsubstep
1734 sv_a_nz
= yield self
.dec2
.sv_a_nz
1735 fft_mode
= yield self
.dec2
.use_svp64_fft
1736 in1
= yield self
.dec2
.e
.read_reg1
.data
1737 log("SVP64: VL, subvl, srcstep, dststep, ssubstep, dsybstep, sv_a_nz, "
1739 vl
, subvl
, srcstep
, dststep
, ssubstep
, dsubstep
,
1740 sv_a_nz
, in1
, fft_mode
,
1743 # get predicate mask (all 64 bits)
1744 srcmask
= dstmask
= 0xffff_ffff_ffff_ffff
1746 pmode
= yield self
.dec2
.rm_dec
.predmode
1747 reverse_gear
= yield self
.dec2
.rm_dec
.reverse_gear
1748 sv_ptype
= yield self
.dec2
.dec
.op
.SV_Ptype
1749 srcpred
= yield self
.dec2
.rm_dec
.srcpred
1750 dstpred
= yield self
.dec2
.rm_dec
.dstpred
1751 pred_src_zero
= yield self
.dec2
.rm_dec
.pred_sz
1752 pred_dst_zero
= yield self
.dec2
.rm_dec
.pred_dz
1753 if pmode
== SVP64PredMode
.INT
.value
:
1754 srcmask
= dstmask
= get_predint(self
.gpr
, dstpred
)
1755 if sv_ptype
== SVPtype
.P2
.value
:
1756 srcmask
= get_predint(self
.gpr
, srcpred
)
1757 elif pmode
== SVP64PredMode
.CR
.value
:
1758 srcmask
= dstmask
= get_predcr(self
.crl
, dstpred
, vl
)
1759 if sv_ptype
== SVPtype
.P2
.value
:
1760 srcmask
= get_predcr(self
.crl
, srcpred
, vl
)
1761 # work out if the ssubsteps are completed
1762 ssubstart
= ssubstep
== 0
1763 dsubstart
= dsubstep
== 0
1764 log(" pmode", pmode
)
1765 log(" reverse", reverse_gear
)
1766 log(" ptype", sv_ptype
)
1767 log(" srcpred", bin(srcpred
))
1768 log(" dstpred", bin(dstpred
))
1769 log(" srcmask", bin(srcmask
))
1770 log(" dstmask", bin(dstmask
))
1771 log(" pred_sz", bin(pred_src_zero
))
1772 log(" pred_dz", bin(pred_dst_zero
))
1773 log(" ssubstart", ssubstart
)
1774 log(" dsubstart", dsubstart
)
1776 # okaaay, so here we simply advance srcstep (TODO dststep)
1777 # this can ONLY be done at the beginning of the "for" loop
1778 # (this is all actually a FSM so it's hell to keep track sigh)
1780 # until the predicate mask has a "1" bit... or we run out of VL
1781 # let srcstep==VL be the indicator to move to next instruction
1782 if not pred_src_zero
:
1783 while (((1 << srcstep
) & srcmask
) == 0) and (srcstep
!= vl
):
1784 log(" sskip", bin(1 << srcstep
))
1788 if not pred_dst_zero
:
1789 while (((1 << dststep
) & dstmask
) == 0) and (dststep
!= vl
):
1790 log(" dskip", bin(1 << dststep
))
1793 # now work out if the relevant mask bits require zeroing
1795 pred_dst_zero
= ((1 << dststep
) & dstmask
) == 0
1797 pred_src_zero
= ((1 << srcstep
) & srcmask
) == 0
1799 # store new srcstep / dststep
1800 self
.new_srcstep
, self
.new_dststep
= (srcstep
, dststep
)
1801 self
.new_ssubstep
, self
.new_dsubstep
= (ssubstep
, dsubstep
)
1802 self
.pred_dst_zero
, self
.pred_src_zero
= (pred_dst_zero
, pred_src_zero
)
1803 log(" new srcstep", srcstep
)
1804 log(" new dststep", dststep
)
1805 log(" new ssubstep", ssubstep
)
1806 log(" new dsubstep", dsubstep
)
1808 def get_src_dststeps(self
):
1809 """gets srcstep, dststep, and ssubstep, dsubstep
1811 return (self
.new_srcstep
, self
.new_dststep
,
1812 self
.new_ssubstep
, self
.new_dsubstep
)
1814 def update_new_svstate_steps(self
):
1815 # note, do not get the bit-reversed srcstep here!
1816 srcstep
, dststep
= self
.new_srcstep
, self
.new_dststep
1817 ssubstep
, dsubstep
= self
.new_ssubstep
, self
.new_dsubstep
1819 # update SVSTATE with new srcstep
1820 self
.svstate
.srcstep
= srcstep
1821 self
.svstate
.dststep
= dststep
1822 self
.svstate
.ssubstep
= ssubstep
1823 self
.svstate
.dsubstep
= dsubstep
1824 self
.namespace
['SVSTATE'] = self
.svstate
1825 yield self
.dec2
.state
.svstate
.eq(self
.svstate
.value
)
1826 yield Settle() # let decoder update
1827 srcstep
= self
.svstate
.srcstep
1828 dststep
= self
.svstate
.dststep
1829 ssubstep
= self
.svstate
.ssubstep
1830 dsubstep
= self
.svstate
.dsubstep
1831 vl
= self
.svstate
.vl
1832 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1833 log(" srcstep", srcstep
)
1834 log(" dststep", dststep
)
1835 log(" ssubstep", ssubstep
)
1836 log(" dsubstep", dsubstep
)
1838 log(" subvl", subvl
)
1840 # check if end reached (we let srcstep overrun, above)
1841 # nothing needs doing (TODO zeroing): just do next instruction
1842 return srcstep
== vl
or dststep
== vl
1844 def svstate_post_inc(self
, insn_name
, vf
=0):
1845 # check if SV "Vertical First" mode is enabled
1846 vfirst
= self
.svstate
.vfirst
1847 log(" SV Vertical First", vf
, vfirst
)
1848 if not vf
and vfirst
== 1:
1852 # check if it is the SVSTATE.src/dest step that needs incrementing
1853 # this is our Sub-Program-Counter loop from 0 to VL-1
1854 # XXX twin predication TODO
1855 vl
= self
.svstate
.vl
1856 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1857 mvl
= self
.svstate
.maxvl
1858 srcstep
= self
.svstate
.srcstep
1859 dststep
= self
.svstate
.dststep
1860 ssubstep
= self
.svstate
.ssubstep
1861 dsubstep
= self
.svstate
.dsubstep
1862 rm_mode
= yield self
.dec2
.rm_dec
.mode
1863 reverse_gear
= yield self
.dec2
.rm_dec
.reverse_gear
1864 sv_ptype
= yield self
.dec2
.dec
.op
.SV_Ptype
1865 out_vec
= not (yield self
.dec2
.no_out_vec
)
1866 in_vec
= not (yield self
.dec2
.no_in_vec
)
1867 log(" svstate.vl", vl
)
1868 log(" svstate.mvl", mvl
)
1869 log(" rm.subvl", subvl
)
1870 log(" svstate.srcstep", srcstep
)
1871 log(" svstate.dststep", dststep
)
1872 log(" svstate.ssubstep", ssubstep
)
1873 log(" svstate.dsubstep", dsubstep
)
1874 log(" mode", rm_mode
)
1875 log(" reverse", reverse_gear
)
1876 log(" out_vec", out_vec
)
1877 log(" in_vec", in_vec
)
1878 log(" sv_ptype", sv_ptype
, sv_ptype
== SVPtype
.P2
.value
)
1879 # check if srcstep needs incrementing by one, stop PC advancing
1880 # svp64 loop can end early if the dest is scalar for single-pred
1881 # but for 2-pred both src/dest have to be checked.
1882 # XXX this might not be true! it may just be LD/ST
1883 if sv_ptype
== SVPtype
.P2
.value
:
1884 svp64_is_vector
= (out_vec
or in_vec
)
1886 svp64_is_vector
= out_vec
1887 # check if this was an sv.bc* and if so did it succeed
1888 if self
.is_svp64_mode
and insn_name
.startswith("sv.bc"):
1889 end_loop
= self
.namespace
['end_loop']
1890 log("branch %s end_loop" % insn_name
, end_loop
)
1892 self
.svp64_reset_loop()
1893 self
.update_pc_next()
1895 # loops end at the first "hit" (source or dest)
1896 loopend
= ((srcstep
== vl
-1 and ssubstep
== subvl
) or
1897 (dststep
== vl
-1 and dsubstep
== subvl
))
1898 if svp64_is_vector
and not loopend
:
1899 yield from self
.advance_svstate_steps()
1900 self
.namespace
['SVSTATE'] = self
.svstate
1901 # not an SVP64 branch, so fix PC (NIA==CIA) for next loop
1902 # (by default, NIA is CIA+4 if v3.0B or CIA+8 if SVP64)
1903 # this way we keep repeating the same instruction (with new steps)
1904 self
.pc
.NIA
.value
= self
.pc
.CIA
.value
1905 self
.namespace
['NIA'] = self
.pc
.NIA
1906 log("end of sub-pc call", self
.namespace
['CIA'],
1907 self
.namespace
['NIA'])
1908 return False # DO NOT allow PC update whilst Sub-PC loop running
1910 # reset loop to zero and update NIA
1911 self
.svp64_reset_loop()
1916 def advance_svstate_steps(self
, end_src
=False, end_dst
=False):
1917 """ advance sub/steps. note that Pack/Unpack *INVERTS* the order.
1918 TODO when Pack/Unpack is set, substep becomes the *outer* loop
1920 subvl
= yield self
.dec2
.rm_dec
.rm_in
.subvl
1922 ssubstep
= self
.svstate
.ssubstep
1923 end_sub
= ssubstep
== subvl
1926 self
.svstate
.srcstep
+= SelectableInt(1, 7)
1927 self
.svstate
.ssubstep
= SelectableInt(0, 2) # reset
1929 self
.svstate
.ssubstep
+= SelectableInt(1, 2) # advance ssubstep
1931 dsubstep
= self
.svstate
.dsubstep
1932 end_sub
= dsubstep
== subvl
1935 self
.svstate
.dststep
+= SelectableInt(1, 7)
1936 self
.svstate
.dsubstep
= SelectableInt(0, 2) # reset
1938 self
.svstate
.dsubstep
+= SelectableInt(1, 2) # advance ssubstep
1940 def update_pc_next(self
):
1941 # UPDATE program counter
1942 self
.pc
.update(self
.namespace
, self
.is_svp64_mode
)
1943 self
.svstate
.spr
= self
.namespace
['SVSTATE']
1944 log("end of call", self
.namespace
['CIA'],
1945 self
.namespace
['NIA'],
1946 self
.namespace
['SVSTATE'])
1948 def svp64_reset_loop(self
):
1949 self
.svstate
.srcstep
= 0
1950 self
.svstate
.dststep
= 0
1951 self
.svstate
.ssubstep
= 0
1952 self
.svstate
.dsubstep
= 0
1953 log(" svstate.srcstep loop end (PC to update)")
1954 self
.namespace
['SVSTATE'] = self
.svstate
1956 def update_nia(self
):
1957 self
.pc
.update_nia(self
.is_svp64_mode
)
1958 self
.namespace
['NIA'] = self
.pc
.NIA
1962 """Decorator factory.
1964 this decorator will "inject" variables into the function's namespace,
1965 from the *dictionary* in self.namespace. it therefore becomes possible
1966 to make it look like a whole stack of variables which would otherwise
1967 need "self." inserted in front of them (*and* for those variables to be
1968 added to the instance) "appear" in the function.
1970 "self.namespace['SI']" for example becomes accessible as just "SI" but
1971 *only* inside the function, when decorated.
1973 def variable_injector(func
):
1975 def decorator(*args
, **kwargs
):
1977 func_globals
= func
.__globals
__ # Python 2.6+
1978 except AttributeError:
1979 func_globals
= func
.func_globals
# Earlier versions.
1981 context
= args
[0].namespace
# variables to be injected
1982 saved_values
= func_globals
.copy() # Shallow copy of dict.
1983 log("globals before", context
.keys())
1984 func_globals
.update(context
)
1985 result
= func(*args
, **kwargs
)
1986 log("globals after", func_globals
['CIA'], func_globals
['NIA'])
1987 log("args[0]", args
[0].namespace
['CIA'],
1988 args
[0].namespace
['NIA'],
1989 args
[0].namespace
['SVSTATE'])
1990 if 'end_loop' in func_globals
:
1991 log("args[0] end_loop", func_globals
['end_loop'])
1992 args
[0].namespace
= func_globals
1993 #exec (func.__code__, func_globals)
1996 # func_globals = saved_values # Undo changes.
2002 return variable_injector