8a244a3e865ed66e1d3a8357f18e6a53b6cbf984
1 from functools
import wraps
2 from soc
.decoder
.orderedset
import OrderedSet
3 from soc
.decoder
.selectable_int
import (FieldSelectableInt
, SelectableInt
,
5 from soc
.decoder
.power_enums
import spr_dict
, XER_bits
6 from soc
.decoder
.helpers
import exts
7 from collections
import namedtuple
10 instruction_info
= namedtuple('instruction_info',
11 'func read_regs uninit_regs write_regs ' + \
12 'special_regs op_fields form asmregs')
22 def create_args(reglist
, extra
=None):
34 def __init__(self
, bytes_per_word
=8):
36 self
.bytes_per_word
= bytes_per_word
37 self
.word_log2
= math
.ceil(math
.log2(bytes_per_word
))
39 def _get_shifter_mask(self
, width
, remainder
):
40 shifter
= ((self
.bytes_per_word
- width
) - remainder
) * \
42 mask
= (1 << (width
* 8)) - 1
45 # TODO: Implement ld/st of lesser width
46 def ld(self
, address
, width
=8):
47 remainder
= address
& (self
.bytes_per_word
- 1)
48 address
= address
>> self
.word_log2
49 assert remainder
& (width
- 1) == 0, "Unaligned access unsupported!"
50 if address
in self
.mem
:
51 val
= self
.mem
[address
]
55 if width
!= self
.bytes_per_word
:
56 shifter
, mask
= self
._get
_shifter
_mask
(width
, remainder
)
57 val
= val
& (mask
<< shifter
)
59 print("Read {:x} from addr {:x}".format(val
, address
))
62 def st(self
, address
, value
, width
=8):
63 remainder
= address
& (self
.bytes_per_word
- 1)
64 address
= address
>> self
.word_log2
65 assert remainder
& (width
- 1) == 0, "Unaligned access unsupported!"
66 print("Writing {:x} to addr {:x}".format(value
, address
))
67 if width
!= self
.bytes_per_word
:
68 if address
in self
.mem
:
69 val
= self
.mem
[address
]
72 shifter
, mask
= self
._get
_shifter
_mask
(width
, remainder
)
73 val
&= ~
(mask
<< shifter
)
74 val |
= value
<< shifter
75 self
.mem
[address
] = val
77 self
.mem
[address
] = value
79 def __call__(self
, addr
, sz
):
80 val
= self
.ld(addr
.value
, sz
)
81 print ("memread", addr
, sz
, val
)
82 return SelectableInt(val
, sz
*8)
84 def memassign(self
, addr
, sz
, val
):
85 print ("memassign", addr
, sz
, val
)
86 self
.st(addr
.value
, val
.value
, sz
)
90 def __init__(self
, decoder
, regfile
):
94 self
[i
] = SelectableInt(regfile
[i
], 64)
96 def __call__(self
, ridx
):
99 def set_form(self
, form
):
102 def getz(self
, rnum
):
103 #rnum = rnum.value # only SelectableInt allowed
104 print("GPR getzero", rnum
)
106 return SelectableInt(0, 64)
109 def _get_regnum(self
, attr
):
110 getform
= self
.sd
.sigforms
[self
.form
]
111 rnum
= getattr(getform
, attr
)
114 def ___getitem__(self
, attr
):
115 print("GPR getitem", attr
)
116 rnum
= self
._get
_regnum
(attr
)
117 return self
.regfile
[rnum
]
120 for i
in range(0, len(self
), 8):
123 s
.append("%08x" % self
[i
+j
].value
)
125 print("reg", "%2d" % i
, s
)
128 def __init__(self
, pc_init
=0):
129 self
.CIA
= SelectableInt(pc_init
, 64)
130 self
.NIA
= self
.CIA
+ SelectableInt(4, 64)
132 def update(self
, namespace
):
133 self
.CIA
= namespace
['NIA'].narrow(64)
134 self
.NIA
= self
.CIA
+ SelectableInt(4, 64)
135 namespace
['CIA'] = self
.CIA
136 namespace
['NIA'] = self
.NIA
140 def __init__(self
, dec2
):
144 def __getitem__(self
, key
):
145 # if key in special_sprs get the special spr, otherwise return key
146 if isinstance(key
, SelectableInt
):
148 key
= special_sprs
.get(key
, key
)
150 return dict.__getitem
__(self
, key
)
153 return SelectableInt(0, info
.length
)
155 def __setitem__(self
, key
, value
):
156 if isinstance(key
, SelectableInt
):
158 key
= special_sprs
.get(key
, key
)
159 dict.__setitem
__(self
, key
, value
)
161 def __call__(self
, ridx
):
167 # decoder2 - an instance of power_decoder2
168 # regfile - a list of initial values for the registers
169 def __init__(self
, decoder2
, regfile
):
170 self
.gpr
= GPR(decoder2
, regfile
)
173 self
.spr
= SPR(decoder2
)
175 # FPR (same as GPR except for FP nums)
176 # 4.2.2 p124 FPSCR (definitely "separate" - not in SPR)
177 # note that mffs, mcrfs, mtfsf "manage" this FPSCR
178 # 2.3.1 CR (and sub-fields CR0..CR6 - CR0 SO comes from XER.SO)
179 # note that mfocrf, mfcr, mtcr, mtocrf, mcrxrx "manage" CRs
180 # 2.3.2 LR (actually SPR #8)
181 # 2.3.3 CTR (actually SPR #9)
182 # 2.3.4 TAR (actually SPR #815)
183 # 3.2.2 p45 XER (actually SPR #0)
184 # 3.2.3 p46 p232 VRSAVE (actually SPR #256)
186 # create CR then allow portions of it to be "selectable" (below)
187 self
._cr
= SelectableInt(0, 64) # underlying reg
188 self
.cr
= FieldSelectableInt(self
._cr
, list(range(32,64)))
190 # "undefined", just set to variable-bit-width int (use exts "max")
191 self
.undefined
= SelectableInt(0, 256) # TODO, not hard-code 256!
193 self
.namespace
= {'GPR': self
.gpr
,
196 'memassign': self
.memassign
,
200 'undefined': self
.undefined
,
201 'mode_is_64bit': True,
203 self
.namespace
.update(XER_bits
)
205 # field-selectable versions of Condition Register TODO check bitranges?
208 bits
= tuple(range(i
*4, (i
+1)*4))# errr... maybe?
209 _cr
= FieldSelectableInt(self
.cr
, bits
)
211 self
.namespace
["CR%d" % i
] = _cr
213 self
.decoder
= decoder2
.dec
216 def memassign(self
, ea
, sz
, val
):
217 self
.mem
.memassign(ea
, sz
, val
)
219 def prep_namespace(self
, formname
, op_fields
):
220 # TODO: get field names from form in decoder*1* (not decoder2)
221 # decoder2 is hand-created, and decoder1.sigform is auto-generated
223 # then "yield" fields only from op_fields rather than hard-coded
225 fields
= self
.decoder
.sigforms
[formname
]
226 for name
in op_fields
:
228 sig
= getattr(fields
, name
.upper())
230 sig
= getattr(fields
, name
)
233 self
.namespace
[name
] = val
235 self
.namespace
[name
] = SelectableInt(val
, sig
.width
)
237 self
.namespace
['XER'] = self
.spr
['XER']
239 def handle_carry(self
, inputs
, outputs
):
240 inv_a
= yield self
.dec2
.invert_a
242 inputs
[0] = ~inputs
[0]
243 assert len(outputs
) >= 1
245 gts
= [(x
> output
) == SelectableInt(1, 1) for x
in inputs
]
251 def handle_comparison(self
, outputs
):
253 out
= exts(out
.value
, out
.bits
)
254 zero
= SelectableInt(out
== 0, 1)
255 positive
= SelectableInt(out
> 0, 1)
256 negative
= SelectableInt(out
< 0, 1)
257 SO
= SelectableInt(0, 1)
258 cr_field
= selectconcat(negative
, positive
, zero
, SO
)
259 self
.crl
[0].eq(cr_field
)
262 def call(self
, name
):
263 # TODO, asmregs is from the spec, e.g. add RT,RA,RB
264 # see http://bugs.libre-riscv.org/show_bug.cgi?id=282
265 info
= self
.instrs
[name
]
266 yield from self
.prep_namespace(info
.form
, info
.op_fields
)
268 # preserve order of register names
269 input_names
= create_args(list(info
.read_regs
) + list(info
.uninit_regs
))
272 # main registers (RT, RA ...)
274 for name
in input_names
:
275 regnum
= yield getattr(self
.decoder
, name
)
277 self
.namespace
[regname
] = regnum
278 print('reading reg %d' % regnum
)
279 inputs
.append(self
.gpr(regnum
))
281 # "special" registers
282 for special
in info
.special_regs
:
283 if special
in special_sprs
:
284 inputs
.append(self
.spr
[special
])
286 inputs
.append(self
.namespace
[special
])
289 results
= info
.func(self
, *inputs
)
292 carry_en
= yield self
.dec2
.e
.rc
.data
294 cy
= self
.handle_carry(inputs
, results
)
296 self
.handle_comparison(results
)
298 # any modified return results?
300 output_names
= create_args(info
.write_regs
)
301 for name
, output
in zip(output_names
, results
):
302 if name
in info
.special_regs
:
303 print('writing special %s' % name
, output
)
304 if name
in special_sprs
:
305 self
.spr
[name
] = output
307 self
.namespace
[name
].eq(output
)
309 regnum
= yield getattr(self
.decoder
, name
)
310 print('writing reg %d' % regnum
)
312 output
= SelectableInt(output
.value
, 64)
313 self
.gpr
[regnum
] = output
315 # update program counter
316 self
.pc
.update(self
.namespace
)
320 """ Decorator factory. """
321 def variable_injector(func
):
323 def decorator(*args
, **kwargs
):
325 func_globals
= func
.__globals
__ # Python 2.6+
326 except AttributeError:
327 func_globals
= func
.func_globals
# Earlier versions.
329 context
= args
[0].namespace
330 saved_values
= func_globals
.copy() # Shallow copy of dict.
331 func_globals
.update(context
)
332 result
= func(*args
, **kwargs
)
333 args
[0].namespace
= func_globals
334 #exec (func.__code__, func_globals)
337 # func_globals = saved_values # Undo changes.
343 return variable_injector