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92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
from amaranth import *
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from power_fv import pfv
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from power_fv.insn.const import *
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from power_fv.intr import *
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from . import InsnSpec
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from .utils import iea, msr_to_srr1
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__all__ = ["TrapSpec"]
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class TrapSpec(InsnSpec, Elaboratable):
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def elaborate(self, platform):
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m = Module()
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m.d.comb += [
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self.pfv.stb .eq(1),
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self.pfv.insn.eq(Cat(Const(0, 32), self.insn.as_value())),
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]
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src_a = Signal(signed(64))
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src_b = Signal(signed(64))
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cond = Record([("gtu", 1), ("ltu", 1), ("eq_", 1), ("gts", 1), ("lts", 1)])
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trap = Record.like(cond)
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# Operand A : EXTS((RA)(32:63))
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m.d.comb += [
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self.pfv.ra.index.eq(self.insn.RA),
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self.pfv.ra.r_stb.eq(1),
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src_a.eq(self.pfv.ra.r_data[:32].as_signed()),
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]
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# Operand B : EXTS(SI) or EXTS((RB)(32:63))
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if isinstance(self.insn, TWI):
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m.d.comb += src_b.eq(self.insn.SI)
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elif isinstance(self.insn, TW):
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m.d.comb += [
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self.pfv.rb.index.eq(self.insn.RB),
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self.pfv.rb.r_stb.eq(1),
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src_b.eq(self.pfv.rb.r_data[:32].as_signed()),
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]
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else:
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assert False
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# Compare operands
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m.d.comb += [
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cond.eq(self.insn.TO),
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trap.lts.eq(cond.lts & (src_a < src_b)),
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trap.gts.eq(cond.gts & (src_a > src_b)),
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trap.eq_.eq(cond.eq_ & (src_a == src_b)),
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trap.ltu.eq(cond.ltu & (src_a.as_unsigned() < src_b.as_unsigned())),
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trap.gtu.eq(cond.gtu & (src_a.as_unsigned() > src_b.as_unsigned())),
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]
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# Trap if a condition is met
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m.d.comb += self.pfv.msr.r_mask.sf.eq(1)
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with m.If(trap.any()):
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m.d.comb += [
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self.pfv.intr.eq(1),
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self.pfv.nia .eq(INTR_PROGRAM.vector_addr),
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INTR_PROGRAM.write_msr(self.pfv.msr),
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self.pfv.srr0.w_mask.eq(Repl(1, 64)),
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self.pfv.srr0.w_data.eq(iea(self.pfv.cia, self.pfv.msr.r_data.sf)),
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self.pfv.srr1.w_mask[63-36:64-33].eq(0xf),
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self.pfv.srr1.w_data[63-36:64-33].eq(0x0),
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self.pfv.srr1.w_mask[63-42].eq(1),
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self.pfv.srr1.w_data[63-42].eq(0),
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self.pfv.srr1.w_mask[63-46:64-43].eq(Repl(1, 4)),
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self.pfv.srr1.w_data[63-46:64-43].eq(0b0001), # Trap type
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self.pfv.srr1.w_mask[63-47].eq(1),
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self.pfv.srr1.w_data[63-47].eq(0),
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msr_to_srr1(self.pfv.msr, self.pfv.srr1, 0, 32),
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msr_to_srr1(self.pfv.msr, self.pfv.srr1, 37, 41),
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msr_to_srr1(self.pfv.msr, self.pfv.srr1, 48, 63),
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]
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with m.Else():
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m.d.comb += self.pfv.nia.eq(iea(self.pfv.cia + 4, self.pfv.msr.r_data.sf))
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return m
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