-"""core of the python-based POWER9 simulator
+# moved to openpower-isa
+# https://git.libre-soc.org/?p=openpower-isa.git;a=summary
+# wildcard imports here ONLY to support migration
-this is part of a cycle-accurate POWER9 simulator. its primary purpose is
-not speed, it is for both learning and educational purposes, as well as
-a method of verifying the HDL.
-
-related bugs:
-
-* https://bugs.libre-soc.org/show_bug.cgi?id=424
-"""
-
-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, gtu, ltu
-from soc.consts import PIb, MSRb # big-endian (PowerISA versions)
-
-from collections import namedtuple
-import math
-import sys
-
-instruction_info = namedtuple('instruction_info',
- 'func read_regs uninit_regs write_regs ' +
- 'special_regs op_fields form asmregs')
-
-special_sprs = {
- 'LR': 8,
- 'CTR': 9,
- 'TAR': 815,
- 'XER': 1,
- '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
-
-
-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, swap=False)
- print("memread", addr, sz, val)
- return SelectableInt(val, sz*8)
-
- def memassign(self, addr, sz, val):
- print("memassign", addr, sz, val)
- self.st(addr.value, val.value, sz, swap=False)
-
-
-class GPR(dict):
- def __init__(self, decoder, regfile):
- dict.__init__(self)
- self.sd = decoder
- for i in range(32):
- self[i] = SelectableInt(regfile[i], 64)
-
- def __call__(self, ridx):
- return self[ridx]
-
- def set_form(self, form):
- self.form = form
-
- def getz(self, rnum):
- # rnum = rnum.value # only SelectableInt allowed
- print("GPR getzero", rnum)
- if rnum == 0:
- return SelectableInt(0, 64)
- return self[rnum]
-
- def _get_regnum(self, attr):
- getform = self.sd.sigforms[self.form]
- rnum = getattr(getform, attr)
- return rnum
-
- def ___getitem__(self, attr):
- print("GPR getitem", attr)
- rnum = self._get_regnum(attr)
- return self.regfile[rnum]
-
- def dump(self):
- for i in range(0, len(self), 8):
- s = []
- for j in range(8):
- s.append("%08x" % self[i+j].value)
- 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.sd = dec2
- dict.__init__(self)
- for key, v in initial_sprs.items():
- if isinstance(key, SelectableInt):
- key = key.value
- key = special_sprs.get(key, key)
- if isinstance(key, int):
- info = spr_dict[key]
- else:
- info = spr_byname[key]
- if not isinstance(v, SelectableInt):
- v = SelectableInt(v, info.length)
- self[key] = v
-
- def __getitem__(self, key):
- 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:
- if isinstance(key, int):
- info = spr_dict[key]
- else:
- info = spr_byname[key]
- dict.__setitem__(self, key, SelectableInt(0, info.length))
- res = dict.__getitem__(self, key)
- print("spr returning", key, res)
- return res
-
- def __setitem__(self, key, value):
- if isinstance(key, SelectableInt):
- key = key.value
- if isinstance(key, int):
- key = spr_dict[key].SPR
- print("spr key", key)
- key = special_sprs.get(key, key)
- 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 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):
-
- self.bigendian = bigendian
- self.halted = False
- self.respect_pc = respect_pc
- if initial_sprs is None:
- initial_sprs = {}
- if initial_mem is None:
- initial_mem = {}
- if initial_insns is None:
- 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)
-
- # "fake program counter" mode (for unit testing)
- self.fake_pc = 0
- disasm_start = 0
- if not respect_pc:
- if isinstance(initial_mem, tuple):
- self.fake_pc = initial_mem[0]
- disasm_start = self.fake_pc
- else:
- disasm_start = initial_pc
-
- # disassembly: we need this for now (not given from the decoder)
- self.disassembly = {}
- if disassembly:
- for i, code in enumerate(disassembly):
- self.disassembly[i*4 + disasm_start] = code
-
- # set up registers, instruction memory, data memory, PC, SPRs, MSR
- self.gpr = GPR(decoder2, regfile)
- self.mem = Mem(row_bytes=8, initial_mem=initial_mem)
- self.imem = Mem(row_bytes=4, initial_mem=initial_insns)
- 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)
- # 4.2.2 p124 FPSCR (definitely "separate" - not in SPR)
- # note that mffs, mcrfs, mtfsf "manage" this FPSCR
- # 2.3.1 CR (and sub-fields CR0..CR6 - CR0 SO comes from XER.SO)
- # note that mfocrf, mfcr, mtcr, mtocrf, mcrxrx "manage" CRs
- # -- Done
- # 2.3.2 LR (actually SPR #8) -- Done
- # 2.3.3 CTR (actually SPR #9) -- Done
- # 2.3.4 TAR (actually SPR #815)
- # 3.2.2 p45 XER (actually SPR #1) -- Done
- # 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)))
-
- # "undefined", just set to variable-bit-width int (use exts "max")
- 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']
- })
-
- # 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?
- _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=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'][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[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)
-
- def prep_namespace(self, formname, op_fields):
- # TODO: get field names from form in decoder*1* (not decoder2)
- # decoder2 is hand-created, and decoder1.sigform is auto-generated
- # from spec
- # then "yield" fields only from op_fields rather than hard-coded
- # list, here.
- fields = self.decoder.sigforms[formname]
- for name in op_fields:
- if name == 'spr':
- sig = getattr(fields, name.upper())
- else:
- sig = getattr(fields, name)
- val = yield sig
- if name in ['BF', 'BFA']:
- self.namespace[name] = val
- else:
- self.namespace[name] = SelectableInt(val, sig.width)
-
- self.namespace['XER'] = self.spr['XER']
- self.namespace['CA'] = self.spr['XER'][XER_bits['CA']].value
- 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_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("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 = (gtu(x, output))
- gts.append(gt)
- print(gts)
- cy = 1 if any(gts) else 0
- if not (1 & already_done):
- self.spr['XER'][XER_bits['CA']] = cy
-
- print("inputs", inputs)
- # 32 bit carry
- gts = []
- for x in inputs:
- print("input", x, output)
- gt = (gtu(x[32:64], output[32:64])) == SelectableInt(1, 1)
- gts.append(gt)
- cy32 = 1 if any(gts) else 0
- 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_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)
- if len(inputs) < 2 and div_overflow is None:
- return
-
- # div overflow is different: it's returned by the pseudo-code
- # because it's more complex than can be done by analysing the output
- if div_overflow is not None:
- ov, ov32 = div_overflow, div_overflow
- # arithmetic overflow can be done by analysing the input and output
- elif len(inputs) >= 2:
- output = outputs[0]
-
- # OV (64-bit)
- input_sgn = [exts(x.value, x.bits) < 0 for x in inputs]
- output_sgn = exts(output.value, output.bits) < 0
- ov = 1 if input_sgn[0] == input_sgn[1] and \
- output_sgn != input_sgn[0] else 0
-
- # OV (32-bit)
- input32_sgn = [exts(x.value, 32) < 0 for x in inputs]
- output32_sgn = exts(output.value, 32) < 0
- ov32 = 1 if input32_sgn[0] == input32_sgn[1] and \
- output32_sgn != input32_sgn[0] else 0
-
- self.spr['XER'][XER_bits['OV']] = ov
- self.spr['XER'][XER_bits['OV32']] = ov32
- so = self.spr['XER'][XER_bits['SO']]
- so = so | ov
- self.spr['XER'][XER_bits['SO']] = so
-
- def handle_comparison(self, outputs):
- out = outputs[0]
- 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:
- # 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))
- 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)
- cr_field = selectconcat(negative, positive, zero, SO)
- self.crl[0].eq(cr_field)
-
- def set_pc(self, pc_val):
- self.namespace['NIA'] = SelectableInt(pc_val, 64)
- self.pc.update(self.namespace)
-
- def setup_one(self):
- """set up one instruction
- """
- if self.respect_pc:
- pc = self.pc.CIA.value
- else:
- pc = self.fake_pc
- self._pc = pc
- ins = self.imem.ld(pc, 4, False, 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)
-
- yield self.dec2.dec.raw_opcode_in.eq(ins & 0xffffffff)
- yield self.dec2.dec.bigendian.eq(self.bigendian)
- yield self.dec2.state.msr.eq(self.msr.value)
- yield self.dec2.state.pc.eq(pc)
-
- 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)
- opname = code.split(' ')[0]
- yield from self.call(opname)
-
- if not self.respect_pc:
- self.fake_pc += 4
- 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, 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
- # grrrr have to special-case MUL op (see DecodeOE)
- 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")
- if rc_en & rc_ok:
- asmop += "."
- else:
- if not asmop.endswith("."): # don't add "." to "andis."
- if rc_en & rc_ok:
- asmop += "."
- 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)
- if AA:
- asmop += "a"
- spr_msb = yield from self.get_spr_msb()
- if int_op == MicrOp.OP_MFCR.value:
- if spr_msb:
- asmop = 'mfocrf'
- else:
- asmop = 'mfcr'
- # XXX TODO: for whatever weird reason this doesn't work
- # https://bugs.libre-soc.org/show_bug.cgi?id=390
- if int_op == MicrOp.OP_MTCRF.value:
- if spr_msb:
- asmop = 'mtocrf'
- else:
- asmop = 'mtcrf'
- return asmop
-
- def get_spr_msb(self):
- dec_insn = yield self.dec2.e.do.insn
- return dec_insn & (1 << 20) != 0 # sigh - XFF.spr[-1]?
-
- def call(self, name):
- name = name.strip() # remove spaces if not already done so
- if self.halted:
- 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)
-
- # check privileged
- int_op = yield self.dec2.dec.op.internal_op
- spr_msb = yield from self.get_spr_msb()
-
- instr_is_privileged = False
- if int_op in [MicrOp.OP_ATTN.value,
- MicrOp.OP_MFMSR.value,
- MicrOp.OP_MTMSR.value,
- MicrOp.OP_MTMSRD.value,
- # TODO: OP_TLBIE
- MicrOp.OP_RFID.value]:
- instr_is_privileged = True
- if int_op in [MicrOp.OP_MFSPR.value,
- MicrOp.OP_MTSPR.value] and spr_msb:
- instr_is_privileged = True
-
- 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[MSRb.PR] == 1:
- self.TRAP(0x700, PIb.PRIV)
- self.namespace['NIA'] = self.trap_nia
- self.pc.update(self.namespace)
- return
-
- # check halted condition
- if name == 'attn':
- self.halted = True
- return
-
- # check illegal instruction
- illegal = False
- if name not in ['mtcrf', 'mtocrf']:
- illegal = name != asmop
-
- if illegal:
- 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))
- return
-
- info = self.instrs[name]
- yield from self.prep_namespace(info.form, info.op_fields)
-
- # preserve order of register names
- input_names = create_args(list(info.read_regs) +
- list(info.uninit_regs))
- print(input_names)
-
- # main registers (RT, RA ...)
- inputs = []
- for name in input_names:
- regnum = yield getattr(self.decoder, name)
- regname = "_" + name
- self.namespace[regname] = regnum
- print('reading reg %d' % regnum)
- inputs.append(self.gpr(regnum))
-
- # "special" registers
- for special in info.special_regs:
- if special in special_sprs:
- inputs.append(self.spr[special])
- else:
- inputs.append(self.namespace[special])
-
- # clear trap (trap) NIA
- self.trap_nia = None
-
- print(inputs)
- results = info.func(self, *inputs)
- print(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'])
-
- # detect if CA/CA32 already in outputs (sra*, basically)
- already_done = 0
- if info.write_regs:
- output_names = create_args(info.write_regs)
- for name in output_names:
- if name == 'CA':
- already_done |= 1
- if name == 'CA32':
- already_done |= 2
-
- print("carry already done?", bin(already_done))
- carry_en = yield self.dec2.e.do.output_carry
- 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)
-
- rc_en = yield self.dec2.e.do.rc.data
- if rc_en:
- self.handle_comparison(results)
-
- # any modified return results?
- if info.write_regs:
- for name, output in zip(output_names, results):
- 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)
- self.spr['XER'][XER_bits[name]] = output.value
- else:
- 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:
- self.spr[name] = output
- else:
- self.namespace[name].eq(output)
- if name == 'MSR':
- print('msr written', hex(self.msr.value))
- else:
- regnum = yield getattr(self.decoder, name)
- print('writing reg %d %s' % (regnum, str(output)))
- if output.bits > 64:
- output = SelectableInt(output.value, 64)
- self.gpr[regnum] = output
-
- print("end of call", self.namespace['CIA'], self.namespace['NIA'])
- # UPDATE program counter
- self.pc.update(self.namespace)
-
-
-def inject():
- """Decorator factory.
-
- this decorator will "inject" variables into the function's namespace,
- from the *dictionary* in self.namespace. it therefore becomes possible
- to make it look like a whole stack of variables which would otherwise
- need "self." inserted in front of them (*and* for those variables to be
- added to the instance) "appear" in the function.
-
- "self.namespace['SI']" for example becomes accessible as just "SI" but
- *only* inside the function, when decorated.
- """
- def variable_injector(func):
- @wraps(func)
- def decorator(*args, **kwargs):
- try:
- func_globals = func.__globals__ # Python 2.6+
- except AttributeError:
- func_globals = func.func_globals # Earlier versions.
-
- 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'])
- args[0].namespace = func_globals
- #exec (func.__code__, func_globals)
-
- # finally:
- # func_globals = saved_values # Undo changes.
-
- return result
-
- return decorator
-
- return variable_injector
+from openpower.decoder.isa.caller import *
projects / soc.git / blobdiff