+# SPDX-License-Identifier: LGPLv3+
+# Copyright (C) 2020, 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+# Copyright (C) 2020 Michael Nolan
+# Funded by NLnet http://nlnet.nl
"""core of the python-based POWER9 simulator
this is part of a cycle-accurate POWER9 simulator. its primary purpose is
* https://bugs.libre-soc.org/show_bug.cgi?id=424
"""
+from nmigen.back.pysim import Settle
from functools import wraps
from copy import copy
from soc.decoder.orderedset import OrderedSet
from soc.decoder.selectable_int import (FieldSelectableInt, SelectableInt,
selectconcat)
from soc.decoder.power_enums import (spr_dict, spr_byname, XER_bits,
- insns, MicrOp)
-from soc.decoder.helpers import exts
-from soc.consts import PI, MSR
+ insns, MicrOp, In1Sel, In2Sel, In3Sel,
+ OutSel, CROutSel,
+ SVP64RMMode, SVP64PredMode,
+ SVP64PredInt, SVP64PredCR)
+
+from soc.decoder.power_enums import SVPtype
+
+from soc.decoder.helpers import exts, gtu, ltu, undefined
+from soc.consts import PIb, MSRb # big-endian (PowerISA versions)
+from soc.consts import SVP64CROffs
+from soc.decoder.power_svp64 import SVP64RM, decode_extra
+
+from soc.decoder.isa.radixmmu import RADIX
+from soc.decoder.isa.mem import Mem, swap_order
from collections import namedtuple
import math
import sys
instruction_info = namedtuple('instruction_info',
- 'func read_regs uninit_regs write_regs ' + \
+ 'func read_regs uninit_regs write_regs ' +
'special_regs op_fields form asmregs')
special_sprs = {
'VRSAVE': 256}
-def swap_order(x, nbytes):
- x = x.to_bytes(nbytes, byteorder='little')
- x = int.from_bytes(x, byteorder='big', signed=False)
- return x
+REG_SORT_ORDER = {
+ # TODO (lkcl): adjust other registers that should be in a particular order
+ # probably CA, CA32, and CR
+ "RT": 0,
+ "RA": 0,
+ "RB": 0,
+ "RS": 0,
+ "CR": 0,
+ "LR": 0,
+ "CTR": 0,
+ "TAR": 0,
+ "CA": 0,
+ "CA32": 0,
+ "MSR": 0,
+ "SVSTATE": 0,
+ "overflow": 1,
+}
-def create_args(reglist, extra=None):
- args = OrderedSet()
- for reg in reglist:
- args.add(reg)
- args = list(args)
- if extra:
- args = [extra] + args
- return args
-
-
-class Mem:
-
- def __init__(self, row_bytes=8, initial_mem=None):
- self.mem = {}
- self.bytes_per_word = row_bytes
- self.word_log2 = math.ceil(math.log2(row_bytes))
- print ("Sim-Mem", initial_mem, self.bytes_per_word, self.word_log2)
- if not initial_mem:
- return
- # different types of memory data structures recognised (for convenience)
- if isinstance(initial_mem, list):
- initial_mem = (0, initial_mem)
- if isinstance(initial_mem, tuple):
- startaddr, mem = initial_mem
- initial_mem = {}
- for i, val in enumerate(mem):
- initial_mem[startaddr + row_bytes*i] = (val, row_bytes)
-
- for addr, (val, width) in initial_mem.items():
- #val = swap_order(val, width)
- self.st(addr, val, width, swap=False)
-
- def _get_shifter_mask(self, wid, remainder):
- shifter = ((self.bytes_per_word - wid) - remainder) * \
- 8 # bits per byte
- # XXX https://bugs.libre-soc.org/show_bug.cgi?id=377
- # BE/LE mode?
- shifter = remainder * 8
- mask = (1 << (wid * 8)) - 1
- print ("width,rem,shift,mask", wid, remainder, hex(shifter), hex(mask))
- return shifter, mask
-
- # TODO: Implement ld/st of lesser width
- def ld(self, address, width=8, swap=True, check_in_mem=False):
- print("ld from addr 0x{:x} width {:d}".format(address, width))
- remainder = address & (self.bytes_per_word - 1)
- address = address >> self.word_log2
- assert remainder & (width - 1) == 0, "Unaligned access unsupported!"
- if address in self.mem:
- val = self.mem[address]
- elif check_in_mem:
- return None
- else:
- val = 0
- print("mem @ 0x{:x} rem {:d} : 0x{:x}".format(address, remainder, val))
-
- if width != self.bytes_per_word:
- shifter, mask = self._get_shifter_mask(width, remainder)
- print ("masking", hex(val), hex(mask<<shifter), shifter)
- val = val & (mask << shifter)
- val >>= shifter
- if swap:
- val = swap_order(val, width)
- print("Read 0x{:x} from addr 0x{:x}".format(val, address))
- return val
-
- def st(self, addr, v, width=8, swap=True):
- staddr = addr
- remainder = addr & (self.bytes_per_word - 1)
- addr = addr >> self.word_log2
- print("Writing 0x{:x} to ST 0x{:x} memaddr 0x{:x}/{:x}".format(v,
- staddr, addr, remainder, swap))
- assert remainder & (width - 1) == 0, "Unaligned access unsupported!"
- if swap:
- v = swap_order(v, width)
- if width != self.bytes_per_word:
- if addr in self.mem:
- val = self.mem[addr]
- else:
- val = 0
- shifter, mask = self._get_shifter_mask(width, remainder)
- val &= ~(mask << shifter)
- val |= v << shifter
- self.mem[addr] = val
- else:
- self.mem[addr] = v
- print("mem @ 0x{:x}: 0x{:x}".format(addr, self.mem[addr]))
-
- def __call__(self, addr, sz):
- val = self.ld(addr.value, sz)
- print ("memread", addr, sz, val)
- return SelectableInt(val, sz*8)
+def create_args(reglist, extra=None):
+ retval = list(OrderedSet(reglist))
+ retval.sort(key=lambda reg: REG_SORT_ORDER[reg])
+ if extra is not None:
+ return [extra] + retval
+ return retval
- def memassign(self, addr, sz, val):
- print ("memassign", addr, sz, val)
- self.st(addr.value, val.value, sz)
class GPR(dict):
- def __init__(self, decoder, regfile):
+ def __init__(self, decoder, isacaller, svstate, regfile):
dict.__init__(self)
self.sd = decoder
+ self.isacaller = isacaller
+ self.svstate = svstate
for i in range(32):
self[i] = SelectableInt(regfile[i], 64)
self.form = form
def getz(self, rnum):
- #rnum = rnum.value # only SelectableInt allowed
- print("GPR getzero", rnum)
+ # rnum = rnum.value # only SelectableInt allowed
+ print("GPR getzero?", rnum)
if rnum == 0:
return SelectableInt(0, 64)
return self[rnum]
return rnum
def ___getitem__(self, attr):
- print("GPR getitem", attr)
+ """ XXX currently not used
+ """
rnum = self._get_regnum(attr)
+ offs = self.svstate.srcstep
+ print("GPR getitem", attr, rnum, "srcoffs", offs)
return self.regfile[rnum]
def dump(self):
s = ' '.join(s)
print("reg", "%2d" % i, s)
-class PC:
- def __init__(self, pc_init=0):
- self.CIA = SelectableInt(pc_init, 64)
- self.NIA = self.CIA + SelectableInt(4, 64)
-
- def update(self, namespace):
- self.CIA = namespace['NIA'].narrow(64)
- self.NIA = self.CIA + SelectableInt(4, 64)
- namespace['CIA'] = self.CIA
- namespace['NIA'] = self.NIA
-
class SPR(dict):
def __init__(self, dec2, initial_sprs={}):
self[key] = v
def __getitem__(self, key):
- print ("get spr", key)
- print ("dict", self.items())
+ print("get spr", key)
+ print("dict", self.items())
# if key in special_sprs get the special spr, otherwise return key
if isinstance(key, SelectableInt):
key = key.value
if isinstance(key, int):
key = spr_dict[key].SPR
key = special_sprs.get(key, key)
+ if key == 'HSRR0': # HACK!
+ key = 'SRR0'
+ if key == 'HSRR1': # HACK!
+ key = 'SRR1'
if key in self:
res = dict.__getitem__(self, key)
else:
info = spr_byname[key]
dict.__setitem__(self, key, SelectableInt(0, info.length))
res = dict.__getitem__(self, key)
- print ("spr returning", key, res)
+ print("spr returning", key, res)
return res
def __setitem__(self, key, value):
key = key.value
if isinstance(key, int):
key = spr_dict[key].SPR
- print ("spr key", key)
+ print("spr key", key)
key = special_sprs.get(key, key)
- print ("setting spr", key, value)
+ if key == 'HSRR0': # HACK!
+ self.__setitem__('SRR0', value)
+ if key == 'HSRR1': # HACK!
+ self.__setitem__('SRR1', value)
+ print("setting spr", key, value)
dict.__setitem__(self, key, value)
def __call__(self, ridx):
return self[ridx]
+class PC:
+ def __init__(self, pc_init=0):
+ self.CIA = SelectableInt(pc_init, 64)
+ self.NIA = self.CIA + SelectableInt(4, 64) # only true for v3.0B!
+
+ def update_nia(self, is_svp64):
+ increment = 8 if is_svp64 else 4
+ self.NIA = self.CIA + SelectableInt(increment, 64)
+
+ def update(self, namespace, is_svp64):
+ """updates the program counter (PC) by 4 if v3.0B mode or 8 if SVP64
+ """
+ self.CIA = namespace['NIA'].narrow(64)
+ self.update_nia(is_svp64)
+ namespace['CIA'] = self.CIA
+ namespace['NIA'] = self.NIA
+
+
+# Simple-V: see https://libre-soc.org/openpower/sv
+class SVP64State:
+ def __init__(self, init=0):
+ self.spr = SelectableInt(init, 32)
+ # fields of SVSTATE, see https://libre-soc.org/openpower/sv/sprs/
+ self.maxvl = FieldSelectableInt(self.spr, tuple(range(0,7)))
+ self.vl = FieldSelectableInt(self.spr, tuple(range(7,14)))
+ self.srcstep = FieldSelectableInt(self.spr, tuple(range(14,21)))
+ self.dststep = FieldSelectableInt(self.spr, tuple(range(21,28)))
+ self.subvl = FieldSelectableInt(self.spr, tuple(range(28,30)))
+ self.svstep = FieldSelectableInt(self.spr, tuple(range(30,32)))
+
+
+# SVP64 ReMap field
+class SVP64RMFields:
+ def __init__(self, init=0):
+ self.spr = SelectableInt(init, 24)
+ # SVP64 RM fields: see https://libre-soc.org/openpower/sv/svp64/
+ self.mmode = FieldSelectableInt(self.spr, [0])
+ self.mask = FieldSelectableInt(self.spr, tuple(range(1,4)))
+ self.elwidth = FieldSelectableInt(self.spr, tuple(range(4,6)))
+ self.ewsrc = FieldSelectableInt(self.spr, tuple(range(6,8)))
+ self.subvl = FieldSelectableInt(self.spr, tuple(range(8,10)))
+ self.extra = FieldSelectableInt(self.spr, tuple(range(10,19)))
+ self.mode = FieldSelectableInt(self.spr, tuple(range(19,24)))
+ # these cover the same extra field, split into parts as EXTRA2
+ self.extra2 = list(range(4))
+ self.extra2[0] = FieldSelectableInt(self.spr, tuple(range(10,12)))
+ self.extra2[1] = FieldSelectableInt(self.spr, tuple(range(12,14)))
+ self.extra2[2] = FieldSelectableInt(self.spr, tuple(range(14,16)))
+ self.extra2[3] = FieldSelectableInt(self.spr, tuple(range(16,18)))
+ self.smask = FieldSelectableInt(self.spr, tuple(range(16,19)))
+ # and here as well, but EXTRA3
+ self.extra3 = list(range(3))
+ self.extra3[0] = FieldSelectableInt(self.spr, tuple(range(10,13)))
+ self.extra3[1] = FieldSelectableInt(self.spr, tuple(range(13,16)))
+ self.extra3[2] = FieldSelectableInt(self.spr, tuple(range(16,19)))
+
+
+SVP64RM_MMODE_SIZE = len(SVP64RMFields().mmode.br)
+SVP64RM_MASK_SIZE = len(SVP64RMFields().mask.br)
+SVP64RM_ELWIDTH_SIZE = len(SVP64RMFields().elwidth.br)
+SVP64RM_EWSRC_SIZE = len(SVP64RMFields().ewsrc.br)
+SVP64RM_SUBVL_SIZE = len(SVP64RMFields().subvl.br)
+SVP64RM_EXTRA2_SPEC_SIZE = len(SVP64RMFields().extra2[0].br)
+SVP64RM_EXTRA3_SPEC_SIZE = len(SVP64RMFields().extra3[0].br)
+SVP64RM_SMASK_SIZE = len(SVP64RMFields().smask.br)
+SVP64RM_MODE_SIZE = len(SVP64RMFields().mode.br)
+
+
+# SVP64 Prefix fields: see https://libre-soc.org/openpower/sv/svp64/
+class SVP64PrefixFields:
+ def __init__(self):
+ self.insn = SelectableInt(0, 32)
+ # 6 bit major opcode EXT001, 2 bits "identifying" (7, 9), 24 SV ReMap
+ self.major = FieldSelectableInt(self.insn, tuple(range(0,6)))
+ self.pid = FieldSelectableInt(self.insn, (7, 9)) # must be 0b11
+ rmfields = [6, 8] + list(range(10,32)) # SVP64 24-bit RM (ReMap)
+ self.rm = FieldSelectableInt(self.insn, rmfields)
+
+
+SV64P_MAJOR_SIZE = len(SVP64PrefixFields().major.br)
+SV64P_PID_SIZE = len(SVP64PrefixFields().pid.br)
+SV64P_RM_SIZE = len(SVP64PrefixFields().rm.br)
+
+# decode SVP64 predicate integer to reg number and invert
+def get_predint(gpr, mask):
+ r10 = gpr(10)
+ r30 = gpr(30)
+ print ("get_predint", mask, SVP64PredInt.ALWAYS.value)
+ if mask == SVP64PredInt.ALWAYS.value:
+ return 0xffff_ffff_ffff_ffff
+ if mask == SVP64PredInt.R3_UNARY.value:
+ return 1 << (gpr(3).value & 0b111111)
+ if mask == SVP64PredInt.R3.value:
+ return gpr(3).value
+ if mask == SVP64PredInt.R3_N.value:
+ return ~gpr(3).value
+ if mask == SVP64PredInt.R10.value:
+ return gpr(10).value
+ if mask == SVP64PredInt.R10_N.value:
+ return ~gpr(10).value
+ if mask == SVP64PredInt.R30.value:
+ return gpr(30).value
+ if mask == SVP64PredInt.R30_N.value:
+ return ~gpr(30).value
+
+# decode SVP64 predicate CR to reg number and invert status
+def _get_predcr(mask):
+ if mask == SVP64PredCR.LT.value:
+ return 0, 1
+ if mask == SVP64PredCR.GE.value:
+ return 0, 0
+ if mask == SVP64PredCR.GT.value:
+ return 1, 1
+ if mask == SVP64PredCR.LE.value:
+ return 1, 0
+ if mask == SVP64PredCR.EQ.value:
+ return 2, 1
+ if mask == SVP64PredCR.NE.value:
+ return 2, 0
+ if mask == SVP64PredCR.SO.value:
+ return 3, 1
+ if mask == SVP64PredCR.NS.value:
+ return 3, 0
+
+# read individual CR fields (0..VL-1), extract the required bit
+# and construct the mask
+def get_predcr(crl, mask, vl):
+ idx, noninv = _get_predcr(mask)
+ mask = 0
+ for i in range(vl):
+ cr = crl[i+SVP64CROffs.CRPred]
+ if cr[idx].value == noninv:
+ mask |= (1<<i)
+ return mask
+
+
+def get_pdecode_idx_in(dec2, name):
+ op = dec2.dec.op
+ in1_sel = yield op.in1_sel
+ in2_sel = yield op.in2_sel
+ in3_sel = yield op.in3_sel
+ # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
+ in1 = yield dec2.e.read_reg1.data
+ in2 = yield dec2.e.read_reg2.data
+ in3 = yield dec2.e.read_reg3.data
+ in1_isvec = yield dec2.in1_isvec
+ in2_isvec = yield dec2.in2_isvec
+ in3_isvec = yield dec2.in3_isvec
+ print ("get_pdecode_idx_in in1", name, in1_sel, In1Sel.RA.value,
+ in1, in1_isvec)
+ print ("get_pdecode_idx_in in2", name, in2_sel, In2Sel.RB.value,
+ in2, in2_isvec)
+ print ("get_pdecode_idx_in in3", name, in3_sel, In3Sel.RS.value,
+ in3, in3_isvec)
+ # identify which regnames map to in1/2/3
+ if name == 'RA':
+ if (in1_sel == In1Sel.RA.value or
+ (in1_sel == In1Sel.RA_OR_ZERO.value and in1 != 0)):
+ return in1, in1_isvec
+ if in1_sel == In1Sel.RA_OR_ZERO.value:
+ return in1, in1_isvec
+ elif name == 'RB':
+ if in2_sel == In2Sel.RB.value:
+ return in2, in2_isvec
+ if in3_sel == In3Sel.RB.value:
+ return in3, in3_isvec
+ # XXX TODO, RC doesn't exist yet!
+ elif name == 'RC':
+ assert False, "RC does not exist yet"
+ elif name == 'RS':
+ if in1_sel == In1Sel.RS.value:
+ return in1, in1_isvec
+ if in2_sel == In2Sel.RS.value:
+ return in2, in2_isvec
+ if in3_sel == In3Sel.RS.value:
+ return in3, in3_isvec
+ return None, False
+
+
+def get_pdecode_cr_out(dec2, name):
+ op = dec2.dec.op
+ out_sel = yield op.cr_out
+ out_bitfield = yield dec2.dec_cr_out.cr_bitfield.data
+ sv_cr_out = yield op.sv_cr_out
+ spec = yield dec2.crout_svdec.spec
+ sv_override = yield dec2.dec_cr_out.sv_override
+ # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
+ out = yield dec2.e.write_cr.data
+ o_isvec = yield dec2.o_isvec
+ print ("get_pdecode_cr_out", out_sel, CROutSel.CR0.value, out, o_isvec)
+ print (" sv_cr_out", sv_cr_out)
+ print (" cr_bf", out_bitfield)
+ print (" spec", spec)
+ print (" override", sv_override)
+ # identify which regnames map to out / o2
+ if name == 'CR0':
+ if out_sel == CROutSel.CR0.value:
+ return out, o_isvec
+ print ("get_pdecode_idx_out not found", name)
+ return None, False
+
+
+def get_pdecode_idx_out(dec2, name):
+ op = dec2.dec.op
+ out_sel = yield op.out_sel
+ # get the IN1/2/3 from the decoder (includes SVP64 remap and isvec)
+ out = yield dec2.e.write_reg.data
+ o_isvec = yield dec2.o_isvec
+ # identify which regnames map to out / o2
+ if name == 'RA':
+ print ("get_pdecode_idx_out", out_sel, OutSel.RA.value, out, o_isvec)
+ if out_sel == OutSel.RA.value:
+ return out, o_isvec
+ elif name == 'RT':
+ print ("get_pdecode_idx_out", out_sel, OutSel.RT.value,
+ OutSel.RT_OR_ZERO.value, out, o_isvec)
+ if out_sel == OutSel.RT.value:
+ return out, o_isvec
+ print ("get_pdecode_idx_out not found", name)
+ return None, False
+
+
+# XXX TODO
+def get_pdecode_idx_out2(dec2, name):
+ op = dec2.dec.op
+ print ("TODO: get_pdecode_idx_out2", name)
+ return None, False
+
+
class ISACaller:
# decoder2 - an instance of power_decoder2
# regfile - a list of initial values for the registers
# initial_{etc} - initial values for SPRs, Condition Register, Mem, MSR
# respect_pc - tracks the program counter. requires initial_insns
def __init__(self, decoder2, regfile, initial_sprs=None, initial_cr=0,
- initial_mem=None, initial_msr=0,
- initial_insns=None, respect_pc=False,
- disassembly=None,
- initial_pc=0,
- bigendian=False):
+ initial_mem=None, initial_msr=0,
+ initial_svstate=0,
+ initial_insns=None, respect_pc=False,
+ disassembly=None,
+ initial_pc=0,
+ bigendian=False,
+ mmu=False):
self.bigendian = bigendian
self.halted = False
+ self.is_svp64_mode = False
self.respect_pc = respect_pc
if initial_sprs is None:
initial_sprs = {}
initial_insns = {}
assert self.respect_pc == False, "instructions required to honor pc"
- print ("ISACaller insns", respect_pc, initial_insns, disassembly)
- print ("ISACaller initial_msr", initial_msr)
+ print("ISACaller insns", respect_pc, initial_insns, disassembly)
+ print("ISACaller initial_msr", initial_msr)
# "fake program counter" mode (for unit testing)
self.fake_pc = 0
self.disassembly[i*4 + disasm_start] = code
# set up registers, instruction memory, data memory, PC, SPRs, MSR
- self.gpr = GPR(decoder2, regfile)
+ self.svp64rm = SVP64RM()
+ if initial_svstate is None:
+ initial_svstate = 0
+ if isinstance(initial_svstate, int):
+ initial_svstate = SVP64State(initial_svstate)
+ self.svstate = initial_svstate
+ self.gpr = GPR(decoder2, self, self.svstate, regfile)
+ self.spr = SPR(decoder2, initial_sprs) # initialise SPRs before MMU
self.mem = Mem(row_bytes=8, initial_mem=initial_mem)
self.imem = Mem(row_bytes=4, initial_mem=initial_insns)
+ # MMU mode, redirect underlying Mem through RADIX
+ self.msr = SelectableInt(initial_msr, 64) # underlying reg
+ if mmu:
+ self.mem = RADIX(self.mem, self)
+ self.imem = RADIX(self.imem, self)
self.pc = PC()
- self.spr = SPR(decoder2, initial_sprs)
- self.msr = SelectableInt(initial_msr, 64) # underlying reg
# TODO, needed here:
# FPR (same as GPR except for FP nums)
# 3.2.3 p46 p232 VRSAVE (actually SPR #256)
# create CR then allow portions of it to be "selectable" (below)
- self._cr = SelectableInt(initial_cr, 64) # underlying reg
- self.cr = FieldSelectableInt(self._cr, list(range(32,64)))
+ #rev_cr = int('{:016b}'.format(initial_cr)[::-1], 2)
+ self.cr = SelectableInt(initial_cr, 64) # underlying reg
+ #self.cr = FieldSelectableInt(self._cr, list(range(32, 64)))
# "undefined", just set to variable-bit-width int (use exts "max")
- self.undefined = SelectableInt(0, 256) # TODO, not hard-code 256!
+ #self.undefined = SelectableInt(0, 256) # TODO, not hard-code 256!
self.namespace = {}
self.namespace.update(self.spr)
self.namespace.update({'GPR': self.gpr,
- 'MEM': self.mem,
- 'SPR': self.spr,
- 'memassign': self.memassign,
- 'NIA': self.pc.NIA,
- 'CIA': self.pc.CIA,
- 'CR': self.cr,
- 'MSR': self.msr,
- 'undefined': self.undefined,
- 'mode_is_64bit': True,
- 'SO': XER_bits['SO']
- })
+ 'MEM': self.mem,
+ 'SPR': self.spr,
+ 'memassign': self.memassign,
+ 'NIA': self.pc.NIA,
+ 'CIA': self.pc.CIA,
+ 'SVSTATE': self.svstate.spr,
+ 'CR': self.cr,
+ 'MSR': self.msr,
+ 'undefined': undefined,
+ 'mode_is_64bit': True,
+ 'SO': XER_bits['SO']
+ })
# update pc to requested start point
self.set_pc(initial_pc)
# field-selectable versions of Condition Register TODO check bitranges?
self.crl = []
for i in range(8):
- bits = tuple(range(i*4, (i+1)*4))# errr... maybe?
+ bits = tuple(range(i*4+32, (i+1)*4+32)) # errr... maybe?
_cr = FieldSelectableInt(self.cr, bits)
self.crl.append(_cr)
self.namespace["CR%d" % i] = _cr
self.decoder = decoder2.dec
self.dec2 = decoder2
- def TRAP(self, trap_addr=0x700, trap_bit=PI.TRAP):
- print ("TRAP:", hex(trap_addr), hex(self.namespace['MSR'].value))
+ def TRAP(self, trap_addr=0x700, trap_bit=PIb.TRAP):
+ print("TRAP:", hex(trap_addr), hex(self.namespace['MSR'].value))
# store CIA(+4?) in SRR0, set NIA to 0x700
# store MSR in SRR1, set MSR to um errr something, have to check spec
self.spr['SRR0'].value = self.pc.CIA.value
self.spr['SRR1'].value = self.namespace['MSR'].value
self.trap_nia = SelectableInt(trap_addr, 64)
- self.spr['SRR1'][63-trap_bit] = 1 # change *copy* of MSR in SRR1
+ self.spr['SRR1'][trap_bit] = 1 # change *copy* of MSR in SRR1
# set exception bits. TODO: this should, based on the address
# in figure 66 p1065 V3.0B and the table figure 65 p1063 set these
# bits appropriately. however it turns out that *for now* in all
# cases (all trap_addrs) the exact same thing is needed.
- self.msr[63-MSR.SF] = 1
- self.msr[63-MSR.EE] = 0
- self.msr[63-MSR.PR] = 0
- self.msr[63-MSR.IR] = 0
- self.msr[63-MSR.DR] = 0
- self.msr[63-MSR.RI] = 0
- self.msr[63-MSR.LE] = 1
+ self.msr[MSRb.IR] = 0
+ self.msr[MSRb.DR] = 0
+ self.msr[MSRb.FE0] = 0
+ self.msr[MSRb.FE1] = 0
+ self.msr[MSRb.EE] = 0
+ self.msr[MSRb.RI] = 0
+ self.msr[MSRb.SF] = 1
+ self.msr[MSRb.TM] = 0
+ self.msr[MSRb.VEC] = 0
+ self.msr[MSRb.VSX] = 0
+ self.msr[MSRb.PR] = 0
+ self.msr[MSRb.FP] = 0
+ self.msr[MSRb.PMM] = 0
+ self.msr[MSRb.TEs] = 0
+ self.msr[MSRb.TEe] = 0
+ self.msr[MSRb.UND] = 0
+ self.msr[MSRb.LE] = 1
def memassign(self, ea, sz, val):
self.mem.memassign(ea, sz, val)
else:
sig = getattr(fields, name)
val = yield sig
- if name in ['BF', 'BFA']:
+ # these are all opcode fields involved in index-selection of CR,
+ # and need to do "standard" arithmetic. CR[BA+32] for example
+ # would, if using SelectableInt, only be 5-bit.
+ if name in ['BF', 'BFA', 'BC', 'BA', 'BB', 'BT', 'BI']:
self.namespace[name] = val
else:
self.namespace[name] = SelectableInt(val, sig.width)
self.namespace['CA32'] = self.spr['XER'][XER_bits['CA32']].value
def handle_carry_(self, inputs, outputs, already_done):
- inv_a = yield self.dec2.e.do.invert_a
+ inv_a = yield self.dec2.e.do.invert_in
if inv_a:
inputs[0] = ~inputs[0]
imm = yield self.dec2.e.do.imm_data.data
inputs.append(SelectableInt(imm, 64))
assert len(outputs) >= 1
- print ("outputs", repr(outputs))
+ print("outputs", repr(outputs))
if isinstance(outputs, list) or isinstance(outputs, tuple):
output = outputs[0]
else:
output = outputs
gts = []
for x in inputs:
- print ("gt input", x, output)
- gt = (x > output)
+ print("gt input", x, output)
+ gt = (gtu(x, output))
gts.append(gt)
print(gts)
cy = 1 if any(gts) else 0
+ print("CA", cy, gts)
if not (1 & already_done):
self.spr['XER'][XER_bits['CA']] = cy
- print ("inputs", inputs)
+ print("inputs", already_done, inputs)
# 32 bit carry
- gts = []
- for x in inputs:
- print ("input", x, output)
- gt = (x[32:64] > output[32:64]) == SelectableInt(1, 1)
- gts.append(gt)
- cy32 = 1 if any(gts) else 0
+ # ARGH... different for OP_ADD... *sigh*...
+ op = yield self.dec2.e.do.insn_type
+ if op == MicrOp.OP_ADD.value:
+ res32 = (output.value & (1 << 32)) != 0
+ a32 = (inputs[0].value & (1 << 32)) != 0
+ if len(inputs) >= 2:
+ b32 = (inputs[1].value & (1 << 32)) != 0
+ else:
+ b32 = False
+ cy32 = res32 ^ a32 ^ b32
+ print("CA32 ADD", cy32)
+ else:
+ gts = []
+ for x in inputs:
+ print("input", x, output)
+ print(" x[32:64]", x, x[32:64])
+ print(" o[32:64]", output, output[32:64])
+ gt = (gtu(x[32:64], output[32:64])) == SelectableInt(1, 1)
+ gts.append(gt)
+ cy32 = 1 if any(gts) else 0
+ print("CA32", cy32, gts)
if not (2 & already_done):
self.spr['XER'][XER_bits['CA32']] = cy32
def handle_overflow(self, inputs, outputs, div_overflow):
- inv_a = yield self.dec2.e.do.invert_a
- if inv_a:
- inputs[0] = ~inputs[0]
+ if hasattr(self.dec2.e.do, "invert_in"):
+ inv_a = yield self.dec2.e.do.invert_in
+ if inv_a:
+ inputs[0] = ~inputs[0]
imm_ok = yield self.dec2.e.do.imm_data.ok
if imm_ok:
imm = yield self.dec2.e.do.imm_data.data
inputs.append(SelectableInt(imm, 64))
assert len(outputs) >= 1
- print ("handle_overflow", inputs, outputs, div_overflow)
+ print("handle_overflow", inputs, outputs, div_overflow)
if len(inputs) < 2 and div_overflow is None:
return
so = so | ov
self.spr['XER'][XER_bits['SO']] = so
- def handle_comparison(self, outputs):
+ def handle_comparison(self, outputs, cr_idx=0):
out = outputs[0]
- print ("handle_comparison", out.bits, hex(out.value))
+ assert isinstance(out, SelectableInt), \
+ "out zero not a SelectableInt %s" % repr(outputs)
+ print("handle_comparison", out.bits, hex(out.value))
# TODO - XXX *processor* in 32-bit mode
# https://bugs.libre-soc.org/show_bug.cgi?id=424
- #if is_32bit:
+ # if is_32bit:
# o32 = exts(out.value, 32)
# print ("handle_comparison exts 32 bit", hex(o32))
out = exts(out.value, out.bits)
- print ("handle_comparison exts", hex(out))
+ print("handle_comparison exts", hex(out))
zero = SelectableInt(out == 0, 1)
positive = SelectableInt(out > 0, 1)
negative = SelectableInt(out < 0, 1)
SO = self.spr['XER'][XER_bits['SO']]
- print ("handle_comparison SO", SO)
+ print("handle_comparison SO", SO)
cr_field = selectconcat(negative, positive, zero, SO)
- self.crl[0].eq(cr_field)
+ self.crl[cr_idx].eq(cr_field)
def set_pc(self, pc_val):
self.namespace['NIA'] = SelectableInt(pc_val, 64)
- self.pc.update(self.namespace)
+ self.pc.update(self.namespace, self.is_svp64_mode)
def setup_one(self):
"""set up one instruction
else:
pc = self.fake_pc
self._pc = pc
- ins = self.imem.ld(pc, 4, False, True)
+ ins = self.imem.ld(pc, 4, False, True, instr_fetch=True)
if ins is None:
raise KeyError("no instruction at 0x%x" % pc)
print("setup: 0x%x 0x%x %s" % (pc, ins & 0xffffffff, bin(ins)))
- print ("CIA NIA", self.respect_pc, self.pc.CIA.value, self.pc.NIA.value)
+ print("CIA NIA", self.respect_pc, self.pc.CIA.value, self.pc.NIA.value)
+ yield self.dec2.sv_rm.eq(0)
yield self.dec2.dec.raw_opcode_in.eq(ins & 0xffffffff)
yield self.dec2.dec.bigendian.eq(self.bigendian)
- yield self.dec2.msr.eq(self.msr.value)
- yield self.dec2.cia.eq(pc)
+ yield self.dec2.state.msr.eq(self.msr.value)
+ yield self.dec2.state.pc.eq(pc)
+ if self.svstate is not None:
+ yield self.dec2.state.svstate.eq(self.svstate.spr.value)
+
+ # SVP64. first, check if the opcode is EXT001, and SVP64 id bits set
+ yield Settle()
+ opcode = yield self.dec2.dec.opcode_in
+ pfx = SVP64PrefixFields() # TODO should probably use SVP64PrefixDecoder
+ pfx.insn.value = opcode
+ major = pfx.major.asint(msb0=True) # MSB0 inversion
+ print ("prefix test: opcode:", major, bin(major),
+ pfx.insn[7] == 0b1, pfx.insn[9] == 0b1)
+ self.is_svp64_mode = ((major == 0b000001) and
+ pfx.insn[7].value == 0b1 and
+ pfx.insn[9].value == 0b1)
+ self.pc.update_nia(self.is_svp64_mode)
+ self.namespace['NIA'] = self.pc.NIA
+ self.namespace['SVSTATE'] = self.svstate.spr
+ if not self.is_svp64_mode:
+ return
+
+ # in SVP64 mode. decode/print out svp64 prefix, get v3.0B instruction
+ print ("svp64.rm", bin(pfx.rm.asint(msb0=True)))
+ print (" svstate.vl", self.svstate.vl.asint(msb0=True))
+ print (" svstate.mvl", self.svstate.maxvl.asint(msb0=True))
+ sv_rm = pfx.rm.asint(msb0=True)
+ ins = self.imem.ld(pc+4, 4, False, True, instr_fetch=True)
+ print(" svsetup: 0x%x 0x%x %s" % (pc+4, ins & 0xffffffff, bin(ins)))
+ yield self.dec2.dec.raw_opcode_in.eq(ins & 0xffffffff) # v3.0B suffix
+ yield self.dec2.sv_rm.eq(sv_rm) # svp64 prefix
+ yield Settle()
def execute_one(self):
"""execute one instruction
"""
# get the disassembly code for this instruction
- code = self.disassembly[self._pc]
- print("sim-execute", hex(self._pc), code)
+ if self.is_svp64_mode:
+ code = self.disassembly[self._pc+4]
+ print(" svp64 sim-execute", hex(self._pc), code)
+ else:
+ code = self.disassembly[self._pc]
+ print("sim-execute", hex(self._pc), code)
opname = code.split(' ')[0]
yield from self.call(opname)
+ # don't use this except in special circumstances
if not self.respect_pc:
self.fake_pc += 4
- print ("execute one, CIA NIA", self.pc.CIA.value, self.pc.NIA.value)
+
+ print("execute one, CIA NIA", self.pc.CIA.value, self.pc.NIA.value)
def get_assembly_name(self):
# TODO, asmregs is from the spec, e.g. add RT,RA,RB
# see http://bugs.libre-riscv.org/show_bug.cgi?id=282
+ dec_insn = yield self.dec2.e.do.insn
asmcode = yield self.dec2.dec.op.asmcode
- print ("get assembly name asmcode", asmcode)
+ print("get assembly name asmcode", asmcode, hex(dec_insn))
asmop = insns.get(asmcode, None)
int_op = yield self.dec2.dec.op.internal_op
# sigh reconstruct the assembly instruction name
- ov_en = yield self.dec2.e.do.oe.oe
- ov_ok = yield self.dec2.e.do.oe.ok
- rc_en = yield self.dec2.e.do.rc.data
- rc_ok = yield self.dec2.e.do.rc.ok
+ if hasattr(self.dec2.e.do, "oe"):
+ ov_en = yield self.dec2.e.do.oe.oe
+ ov_ok = yield self.dec2.e.do.oe.ok
+ else:
+ ov_en = False
+ ov_ok = False
+ if hasattr(self.dec2.e.do, "rc"):
+ rc_en = yield self.dec2.e.do.rc.rc
+ rc_ok = yield self.dec2.e.do.rc.ok
+ else:
+ rc_en = False
+ rc_ok = False
# grrrr have to special-case MUL op (see DecodeOE)
- print ("ov en rc en", ov_ok, ov_en, rc_ok, rc_en, int_op)
+ print("ov %d en %d rc %d en %d op %d" %
+ (ov_ok, ov_en, rc_ok, rc_en, int_op))
if int_op in [MicrOp.OP_MUL_H64.value, MicrOp.OP_MUL_H32.value]:
- print ("mul op")
+ print("mul op")
if rc_en & rc_ok:
asmop += "."
else:
- if ov_en & ov_ok:
- asmop += "."
- lk = yield self.dec2.e.do.lk
- if lk:
- asmop += "l"
- print ("int_op", int_op)
+ if not asmop.endswith("."): # don't add "." to "andis."
+ if rc_en & rc_ok:
+ asmop += "."
+ if hasattr(self.dec2.e.do, "lk"):
+ lk = yield self.dec2.e.do.lk
+ if lk:
+ asmop += "l"
+ print("int_op", int_op)
if int_op in [MicrOp.OP_B.value, MicrOp.OP_BC.value]:
AA = yield self.dec2.dec.fields.FormI.AA[0:-1]
- print ("AA", AA)
+ print("AA", AA)
if AA:
asmop += "a"
spr_msb = yield from self.get_spr_msb()
def get_spr_msb(self):
dec_insn = yield self.dec2.e.do.insn
- return dec_insn & (1<<20) != 0 # sigh - XFF.spr[-1]?
+ return dec_insn & (1 << 20) != 0 # sigh - XFF.spr[-1]?
def call(self, name):
- name = name.strip() # remove spaces if not already done so
+ """call(opcode) - the primary execution point for instructions
+ """
+ name = name.strip() # remove spaces if not already done so
if self.halted:
- print ("halted - not executing", name)
+ print("halted - not executing", name)
return
# TODO, asmregs is from the spec, e.g. add RT,RA,RB
# see http://bugs.libre-riscv.org/show_bug.cgi?id=282
asmop = yield from self.get_assembly_name()
- print ("call", name, asmop)
+ print("call", name, asmop)
# check privileged
int_op = yield self.dec2.dec.op.internal_op
MicrOp.OP_MTSPR.value] and spr_msb:
instr_is_privileged = True
- print ("is priv", instr_is_privileged, hex(self.msr.value),
- self.msr[63-MSR.PR])
+ print("is priv", instr_is_privileged, hex(self.msr.value),
+ self.msr[MSRb.PR])
# check MSR priv bit and whether op is privileged: if so, throw trap
- if instr_is_privileged and self.msr[63-MSR.PR] == 1:
- self.TRAP(0x700, PI.PRIV)
+ if instr_is_privileged and self.msr[MSRb.PR] == 1:
+ self.TRAP(0x700, PIb.PRIV)
self.namespace['NIA'] = self.trap_nia
- self.pc.update(self.namespace)
+ self.pc.update(self.namespace, self.is_svp64_mode)
return
# check halted condition
if name not in ['mtcrf', 'mtocrf']:
illegal = name != asmop
+ # sigh deal with setvl not being supported by binutils (.long)
+ if asmop.startswith('setvl'):
+ illegal = False
+ name = 'setvl'
+
if illegal:
- self.TRAP(0x700, PI.ILLEG)
+ print("illegal", name, asmop)
+ self.TRAP(0x700, PIb.ILLEG)
self.namespace['NIA'] = self.trap_nia
- self.pc.update(self.namespace)
- print ("name %s != %s - calling ILLEGAL trap, PC: %x" % \
- (name, asmop, self.pc.CIA.value))
+ self.pc.update(self.namespace, self.is_svp64_mode)
+ print("name %s != %s - calling ILLEGAL trap, PC: %x" %
+ (name, asmop, self.pc.CIA.value))
return
info = self.instrs[name]
list(info.uninit_regs))
print(input_names)
- # main registers (RT, RA ...)
+ # get SVP64 entry for the current instruction
+ sv_rm = self.svp64rm.instrs.get(name)
+ if sv_rm is not None:
+ dest_cr, src_cr, src_byname, dest_byname = decode_extra(sv_rm)
+ else:
+ dest_cr, src_cr, src_byname, dest_byname = False, False, {}, {}
+ print ("sv rm", sv_rm, dest_cr, src_cr, src_byname, dest_byname)
+
+ # get SVSTATE VL (oh and print out some debug stuff)
+ if self.is_svp64_mode:
+ vl = self.svstate.vl.asint(msb0=True)
+ srcstep = self.svstate.srcstep.asint(msb0=True)
+ dststep = self.svstate.dststep.asint(msb0=True)
+ sv_a_nz = yield self.dec2.sv_a_nz
+ in1 = yield self.dec2.e.read_reg1.data
+ print ("SVP64: VL, srcstep, dststep, sv_a_nz, in1",
+ vl, srcstep, dststep, sv_a_nz, in1)
+
+ # get predicate mask
+ srcmask = dstmask = 0xffff_ffff_ffff_ffff
+ if self.is_svp64_mode:
+ pmode = yield self.dec2.rm_dec.predmode
+ sv_ptype = yield self.dec2.dec.op.SV_Ptype
+ srcpred = yield self.dec2.rm_dec.srcpred
+ dstpred = yield self.dec2.rm_dec.dstpred
+ pred_src_zero = yield self.dec2.rm_dec.pred_sz
+ pred_dst_zero = yield self.dec2.rm_dec.pred_dz
+ if pmode == SVP64PredMode.INT.value:
+ srcmask = dstmask = get_predint(self.gpr, dstpred)
+ if sv_ptype == SVPtype.P2.value:
+ srcmask = get_predint(self.gpr, srcpred)
+ elif pmode == SVP64PredMode.CR.value:
+ srcmask = dstmask = get_predcr(self.crl, dstpred, vl)
+ if sv_ptype == SVPtype.P2.value:
+ srcmask = get_predcr(self.crl, srcpred, vl)
+ print (" pmode", pmode)
+ print (" ptype", sv_ptype)
+ print (" srcpred", bin(srcpred))
+ print (" dstpred", bin(dstpred))
+ print (" srcmask", bin(srcmask))
+ print (" dstmask", bin(dstmask))
+ print (" pred_sz", bin(pred_src_zero))
+ print (" pred_dz", bin(pred_dst_zero))
+
+ # okaaay, so here we simply advance srcstep (TODO dststep)
+ # until the predicate mask has a "1" bit... or we run out of VL
+ # let srcstep==VL be the indicator to move to next instruction
+ if not pred_src_zero:
+ while (((1<<srcstep) & srcmask) == 0) and (srcstep != vl):
+ print (" skip", bin(1<<srcstep))
+ srcstep += 1
+ # same for dststep
+ if not pred_dst_zero:
+ while (((1<<dststep) & dstmask) == 0) and (dststep != vl):
+ print (" skip", bin(1<<dststep))
+ dststep += 1
+
+ # now work out if the relevant mask bits require zeroing
+ if pred_dst_zero:
+ pred_dst_zero = ((1<<dststep) & dstmask) == 0
+ if pred_src_zero:
+ pred_src_zero = ((1<<srcstep) & srcmask) == 0
+
+ # update SVSTATE with new srcstep
+ self.svstate.srcstep[0:7] = srcstep
+ self.svstate.dststep[0:7] = dststep
+ self.namespace['SVSTATE'] = self.svstate.spr
+ yield self.dec2.state.svstate.eq(self.svstate.spr.value)
+ yield Settle() # let decoder update
+ srcstep = self.svstate.srcstep.asint(msb0=True)
+ dststep = self.svstate.dststep.asint(msb0=True)
+ print (" srcstep", srcstep)
+ print (" dststep", dststep)
+
+ # check if end reached (we let srcstep overrun, above)
+ # nothing needs doing (TODO zeroing): just do next instruction
+ if srcstep == vl or dststep == vl:
+ self.svp64_reset_loop()
+ self.update_pc_next()
+ return
+
+ # VL=0 in SVP64 mode means "do nothing: skip instruction"
+ if self.is_svp64_mode and vl == 0:
+ self.pc.update(self.namespace, self.is_svp64_mode)
+ print("SVP64: VL=0, end of call", self.namespace['CIA'],
+ self.namespace['NIA'])
+ return
+
+ # main input registers (RT, RA ...)
inputs = []
for name in input_names:
- regnum = yield getattr(self.decoder, name)
+ # using PowerDecoder2, first, find the decoder index.
+ # (mapping name RA RB RC RS to in1, in2, in3)
+ regnum, is_vec = yield from get_pdecode_idx_in(self.dec2, name)
+ if regnum is None:
+ # doing this is not part of svp64, it's because output
+ # registers, to be modified, need to be in the namespace.
+ regnum, is_vec = yield from get_pdecode_idx_out(self.dec2, name)
+
+ # in case getting the register number is needed, _RA, _RB
regname = "_" + name
self.namespace[regname] = regnum
- print('reading reg %d' % regnum)
- inputs.append(self.gpr(regnum))
+ if not self.is_svp64_mode or not pred_src_zero:
+ print('reading reg %s %s' % (name, str(regnum)), is_vec)
+ reg_val = self.gpr(regnum)
+ else:
+ print('zero input reg %s %s' % (name, str(regnum)), is_vec)
+ reg_val = 0
+ inputs.append(reg_val)
# "special" registers
for special in info.special_regs:
# clear trap (trap) NIA
self.trap_nia = None
- print(inputs)
+ # execute actual instruction here
+ print("inputs", inputs)
results = info.func(self, *inputs)
- print(results)
+ print("results", results)
# "inject" decorator takes namespace from function locals: we need to
# overwrite NIA being overwritten (sigh)
if self.trap_nia is not None:
self.namespace['NIA'] = self.trap_nia
- print ("after func", self.namespace['CIA'], self.namespace['NIA'])
+ print("after func", self.namespace['CIA'], self.namespace['NIA'])
# detect if CA/CA32 already in outputs (sra*, basically)
already_done = 0
if name == 'CA32':
already_done |= 2
- print ("carry already done?", bin(already_done))
- carry_en = yield self.dec2.e.do.output_carry
+ print("carry already done?", bin(already_done))
+ if hasattr(self.dec2.e.do, "output_carry"):
+ carry_en = yield self.dec2.e.do.output_carry
+ else:
+ carry_en = False
if carry_en:
yield from self.handle_carry_(inputs, results, already_done)
- # detect if overflow was in return result
- overflow = None
- if info.write_regs:
- for name, output in zip(output_names, results):
- if name == 'overflow':
- overflow = output
-
- ov_en = yield self.dec2.e.do.oe.oe
- ov_ok = yield self.dec2.e.do.oe.ok
- print ("internal overflow", overflow, ov_en, ov_ok)
- if ov_en & ov_ok:
- yield from self.handle_overflow(inputs, results, overflow)
+ if not self.is_svp64_mode: # yeah just no. not in parallel processing
+ # detect if overflow was in return result
+ overflow = None
+ if info.write_regs:
+ for name, output in zip(output_names, results):
+ if name == 'overflow':
+ overflow = output
+
+ if hasattr(self.dec2.e.do, "oe"):
+ ov_en = yield self.dec2.e.do.oe.oe
+ ov_ok = yield self.dec2.e.do.oe.ok
+ else:
+ ov_en = False
+ ov_ok = False
+ print("internal overflow", overflow, ov_en, ov_ok)
+ if ov_en & ov_ok:
+ yield from self.handle_overflow(inputs, results, overflow)
- rc_en = yield self.dec2.e.do.rc.data
+ # only do SVP64 dest predicated Rc=1 if dest-pred is not enabled
+ rc_en = False
+ if not self.is_svp64_mode or not pred_dst_zero:
+ if hasattr(self.dec2.e.do, "rc"):
+ rc_en = yield self.dec2.e.do.rc.rc
if rc_en:
- self.handle_comparison(results)
+ regnum, is_vec = yield from get_pdecode_cr_out(self.dec2, "CR0")
+ self.handle_comparison(results, regnum)
# any modified return results?
if info.write_regs:
for name, output in zip(output_names, results):
- if name == 'overflow': # ignore, done already (above)
+ if name == 'overflow': # ignore, done already (above)
continue
if isinstance(output, int):
output = SelectableInt(output, 256)
if name in ['CA', 'CA32']:
if carry_en:
- print ("writing %s to XER" % name, output)
+ print("writing %s to XER" % name, output)
self.spr['XER'][XER_bits[name]] = output.value
else:
- print ("NOT writing %s to XER" % name, output)
+ print("NOT writing %s to XER" % name, output)
elif name in info.special_regs:
print('writing special %s' % name, output, special_sprs)
if name in special_sprs:
else:
self.namespace[name].eq(output)
if name == 'MSR':
- print ('msr written', hex(self.msr.value))
+ print('msr written', hex(self.msr.value))
else:
- regnum = yield getattr(self.decoder, name)
- print('writing reg %d %s' % (regnum, str(output)))
+ regnum, is_vec = yield from get_pdecode_idx_out(self.dec2,
+ name)
+ if regnum is None:
+ # temporary hack for not having 2nd output
+ regnum = yield getattr(self.decoder, name)
+ is_vec = False
+ if self.is_svp64_mode and pred_dst_zero:
+ print('zeroing reg %d %s' % (regnum, str(output)),
+ is_vec)
+ output = SelectableInt(0, 256)
+ else:
+ print('writing reg %d %s' % (regnum, str(output)),
+ is_vec)
if output.bits > 64:
output = SelectableInt(output.value, 64)
self.gpr[regnum] = output
- print ("end of call", self.namespace['CIA'], self.namespace['NIA'])
+ # check if it is the SVSTATE.src/dest step that needs incrementing
+ # this is our Sub-Program-Counter loop from 0 to VL-1
+ if self.is_svp64_mode:
+ # XXX twin predication TODO
+ vl = self.svstate.vl.asint(msb0=True)
+ mvl = self.svstate.maxvl.asint(msb0=True)
+ srcstep = self.svstate.srcstep.asint(msb0=True)
+ dststep = self.svstate.dststep.asint(msb0=True)
+ sv_ptype = yield self.dec2.dec.op.SV_Ptype
+ no_out_vec = not (yield self.dec2.no_out_vec)
+ no_in_vec = not (yield self.dec2.no_in_vec)
+ print (" svstate.vl", vl)
+ print (" svstate.mvl", mvl)
+ print (" svstate.srcstep", srcstep)
+ print (" svstate.dststep", dststep)
+ print (" no_out_vec", no_out_vec)
+ print (" no_in_vec", no_in_vec)
+ print (" sv_ptype", sv_ptype, sv_ptype == SVPtype.P2.value)
+ # check if srcstep needs incrementing by one, stop PC advancing
+ # svp64 loop can end early if the dest is scalar for single-pred
+ # but for 2-pred both src/dest have to be checked.
+ # XXX this might not be true! it may just be LD/ST
+ if sv_ptype == SVPtype.P2.value:
+ svp64_is_vector = (no_out_vec or no_in_vec)
+ else:
+ svp64_is_vector = no_out_vec
+ if svp64_is_vector and srcstep != vl-1 and dststep != vl-1:
+ self.svstate.srcstep += SelectableInt(1, 7)
+ self.svstate.dststep += SelectableInt(1, 7)
+ self.pc.NIA.value = self.pc.CIA.value
+ self.namespace['NIA'] = self.pc.NIA
+ self.namespace['SVSTATE'] = self.svstate.spr
+ print("end of sub-pc call", self.namespace['CIA'],
+ self.namespace['NIA'])
+ return # DO NOT allow PC to update whilst Sub-PC loop running
+ # reset loop to zero
+ self.svp64_reset_loop()
+
+ self.update_pc_next()
+
+ def update_pc_next(self):
# UPDATE program counter
- self.pc.update(self.namespace)
-
+ self.pc.update(self.namespace, self.is_svp64_mode)
+ self.svstate.spr = self.namespace['SVSTATE']
+ print("end of call", self.namespace['CIA'],
+ self.namespace['NIA'],
+ self.namespace['SVSTATE'])
+
+ def svp64_reset_loop(self):
+ self.svstate.srcstep[0:7] = 0
+ self.svstate.dststep[0:7] = 0
+ print (" svstate.srcstep loop end (PC to update)")
+ self.pc.update_nia(self.is_svp64_mode)
+ self.namespace['NIA'] = self.pc.NIA
+ self.namespace['SVSTATE'] = self.svstate.spr
def inject():
"""Decorator factory.
except AttributeError:
func_globals = func.func_globals # Earlier versions.
- context = args[0].namespace # variables to be injected
+ context = args[0].namespace # variables to be injected
saved_values = func_globals.copy() # Shallow copy of dict.
func_globals.update(context)
result = func(*args, **kwargs)
- print ("globals after", func_globals['CIA'], func_globals['NIA'])
- print ("args[0]", args[0].namespace['CIA'],
- args[0].namespace['NIA'])
+ print("globals after", func_globals['CIA'], func_globals['NIA'])
+ print("args[0]", args[0].namespace['CIA'],
+ args[0].namespace['NIA'],
+ args[0].namespace['SVSTATE'])
args[0].namespace = func_globals
#exec (func.__code__, func_globals)
- #finally:
+ # finally:
# func_globals = saved_values # Undo changes.
return result
return variable_injector
+