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Merge pull request #1247 from freechipsproject/misa-c 

Implement misa.C proposal
This commit is contained in:
Andrew Waterman 2018-02-22 22:53:49 -08:00 committed by GitHub
parent 32c5c3c04d aad75f2285
commit 69b48b623a
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2 changed files with 9 additions and 7 deletions
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2
src/main/scala/rocket/CSR.scala
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@ -837,6 +837,6 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
when (decoded_addr(lo)) { ctr := wdata(ctr.getWidth-1, 0) }
}
}
def formEPC(x: UInt) = ~(~x | Cat(!reg_misa('c'-'a'), UInt(1)))
def formEPC(x: UInt) = ~(~x | (if (usingCompressed) 1.U else 3.U))
def isaStringToMask(s: String) = s.map(x => 1 << (x - 'A')).foldLeft(0)(_|_)
}

14
src/main/scala/rocket/RocketCore.scala
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@ -228,12 +228,14 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
bpu.io.pc := ibuf.io.pc
bpu.io.ea := mem_reg_wdata
val id_pc_misaligned = !csr.io.status.isa('c'-'a') && ibuf.io.pc(1)
val id_xcpt0 = ibuf.io.inst(0).bits.xcpt0
val id_xcpt1 = ibuf.io.inst(0).bits.xcpt1
val (id_xcpt, id_cause) = checkExceptions(List(
(csr.io.interrupt, csr.io.interrupt_cause),
(bpu.io.debug_if, UInt(CSR.debugTriggerCause)),
(bpu.io.xcpt_if, UInt(Causes.breakpoint)),
(id_pc_misaligned, UInt(Causes.misaligned_fetch)),
(id_xcpt0.pf.inst, UInt(Causes.fetch_page_fault)),
(id_xcpt0.ae.inst, UInt(Causes.fetch_access)),
(id_xcpt1.pf.inst, UInt(Causes.fetch_page_fault)),
@ -427,14 +429,14 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
val mem_breakpoint = (mem_reg_load && bpu.io.xcpt_ld) || (mem_reg_store && bpu.io.xcpt_st)
val mem_debug_breakpoint = (mem_reg_load && bpu.io.debug_ld) || (mem_reg_store && bpu.io.debug_st)
val (mem_new_xcpt, mem_new_cause) = checkExceptions(List(
(mem_debug_breakpoint, UInt(CSR.debugTriggerCause)),
(mem_breakpoint, UInt(Causes.breakpoint)),
(mem_npc_misaligned, UInt(Causes.misaligned_fetch))))
val (mem_ldst_xcpt, mem_ldst_cause) = checkExceptions(List(
(mem_debug_breakpoint, UInt(CSR.debugTriggerCause)),
(mem_breakpoint, UInt(Causes.breakpoint))))
val (mem_xcpt, mem_cause) = checkExceptions(List(
(mem_reg_xcpt_interrupt || mem_reg_xcpt, mem_reg_cause),
(mem_reg_valid && mem_new_xcpt, mem_new_cause)))
(mem_reg_valid && mem_npc_misaligned, UInt(Causes.misaligned_fetch)),
(mem_reg_valid && mem_ldst_xcpt, mem_ldst_cause)))
val memCoverCauses = (exCoverCauses ++ List(
(CSR.debugTriggerCause, "DEBUG_TRIGGER"),
@ -677,7 +679,7 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
io.dmem.req.bits.addr := encodeVirtualAddress(ex_rs(0), alu.io.adder_out)
io.dmem.invalidate_lr := wb_xcpt
io.dmem.s1_data.data := (if (fLen == 0) mem_reg_rs2 else Mux(mem_ctrl.fp, Fill((xLen max fLen) / fLen, io.fpu.store_data), mem_reg_rs2))
io.dmem.s1_kill := killm_common || mem_breakpoint
io.dmem.s1_kill := killm_common || mem_ldst_xcpt
io.rocc.cmd.valid := wb_reg_valid && wb_ctrl.rocc && !replay_wb_common
io.rocc.exception := wb_xcpt && csr.io.status.xs.orR