+"""core of the python-based POWER9 simulator
+
+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, XER_bits
-from soc.decoder.helpers import exts
+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 ' + \
+ '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,
+
+ "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
+ regset = OrderedSet(reglist)
+ retval = []
+ for reg in regset:
+ retval.append(reg)
+ retval.sort(key=lambda reg: REG_SORT_ORDER[reg])
+ if extra is not None:
+ return [extra] + retval
+ return retval
class Mem:
- def __init__(self, bytes_per_word=8):
+ def __init__(self, row_bytes=8, initial_mem=None):
self.mem = {}
- self.bytes_per_word = bytes_per_word
- self.word_log2 = math.ceil(math.log2(bytes_per_word))
-
- def _get_shifter_mask(self, width, remainder):
- shifter = ((self.bytes_per_word - width) - remainder) * \
+ 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
- mask = (1 << (width * 8)) - 1
+ # 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):
+ 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
- print("Read {:x} from addr {:x}".format(val, address))
+ if swap:
+ val = swap_order(val, width)
+ print("Read 0x{:x} from addr 0x{:x}".format(val, address))
return val
- def st(self, address, value, width=8):
- remainder = address & (self.bytes_per_word - 1)
- address = address >> self.word_log2
+ 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!"
- print("Writing {:x} to addr {:x}".format(value, address))
+ if swap:
+ v = swap_order(v, width)
if width != self.bytes_per_word:
- if address in self.mem:
- val = self.mem[address]
+ if addr in self.mem:
+ val = self.mem[addr]
else:
val = 0
shifter, mask = self._get_shifter_mask(width, remainder)
val &= ~(mask << shifter)
- val |= value << shifter
- self.mem[address] = val
+ val |= v << shifter
+ self.mem[addr] = val
else:
- self.mem[address] = value
+ 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)
+ 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)
+ print("memassign", addr, sz, val)
+ self.st(addr.value, val.value, sz, swap=False)
class GPR(dict):
self.form = form
def getz(self, rnum):
- #rnum = rnum.value # only SelectableInt allowed
+ # rnum = rnum.value # only SelectableInt allowed
print("GPR getzero", rnum)
if rnum == 0:
return SelectableInt(0, 64)
s = ' '.join(s)
print("reg", "%2d" % i, s)
+
class PC:
def __init__(self, pc_init=0):
self.CIA = SelectableInt(pc_init, 64)
def __init__(self, dec2, initial_sprs={}):
self.sd = dec2
dict.__init__(self)
- self.update(initial_sprs)
+ 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:
- return dict.__getitem__(self, key)
+ res = dict.__getitem__(self, key)
else:
- info = spr_dict[key]
- return SelectableInt(0, info.length)
+ 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
- def __init__(self, decoder2, regfile, initial_sprs={}, initial_cr=0):
+ # 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()
+ 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)
# 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.namespace = {'GPR': self.gpr,
- 'MEM': self.mem,
- 'SPR': self.spr,
- 'memassign': self.memassign,
- 'NIA': self.pc.NIA,
- 'CIA': self.pc.CIA,
- 'CR': self.cr,
- 'undefined': self.undefined,
- 'mode_is_64bit': True,
- 'SO': XER_bits['SO']
- }
+ 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?
+ 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=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)
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['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):
- inv_a = yield self.dec2.e.invert_a
+ 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
- output = outputs[0]
- gts = [(x > output) == SelectableInt(1, 1) for x in inputs]
- print(gts)
- if any(gts):
- cy = True
+ print("outputs", repr(outputs))
+ if isinstance(outputs, list) or isinstance(outputs, tuple):
+ output = outputs[0]
else:
- cy = False
- self.spr['XER'][XER_bits['CA']] = cy
-
+ 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
+ print("CA", cy, gts)
+ if not (1 & already_done):
+ self.spr['XER'][XER_bits['CA']] = cy
+ print("inputs", already_done, inputs)
# 32 bit carry
- gts = [(x[32:64] > output[32:64]) == SelectableInt(1, 1)
- for x in inputs]
- cy32 = 1 if any(gts) else 0
- self.spr['XER'][XER_bits['CA32']] = cy32
-
+ # 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):
+ 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)
+ 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 = SelectableInt(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
+ 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 %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 += "."
+ 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)
+ 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))
+ input_names = create_args(list(info.read_regs) +
+ list(info.uninit_regs))
print(input_names)
# main registers (RT, RA ...)
else:
inputs.append(self.namespace[special])
+ # clear trap (trap) NIA
+ self.trap_nia = None
+
print(inputs)
results = info.func(self, *inputs)
print(results)
- rc_en = yield self.dec2.e.rc.data
+ # "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))
+ 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
+
+ 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)
+
+ if hasattr(self.dec2.e.do, "rc"):
+ rc_en = yield self.dec2.e.do.rc.rc
+ else:
+ rc_en = False
if rc_en:
self.handle_comparison(results)
- carry_en = yield self.dec2.e.output_carry
- yield from self.handle_carry_(inputs, results)
# any modified return results?
if info.write_regs:
- output_names = create_args(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 info.special_regs:
- print('writing special %s' % name, output)
+ 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)))
output = SelectableInt(output.value, 64)
self.gpr[regnum] = output
- # update program counter
+ print("end of call", self.namespace['CIA'], self.namespace['NIA'])
+ # UPDATE program counter
self.pc.update(self.namespace)
def inject():
- """ Decorator factory. """
+ """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):
except AttributeError:
func_globals = func.func_globals # Earlier versions.
- context = args[0].namespace
+ 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:
+ # finally:
# func_globals = saved_values # Undo changes.
return result
return decorator
return variable_injector
-
projects / soc.git / blobdiff