eb7d329076
code
arch/alpha/alpha_memory.cc:
Fixed unaligned trap faults
arch/alpha/ev5.cc:
little more verbose faulting information
kern/linux/linux_system.cc:
more descriptive errors, and the correct offsets from symbols
sim/system.cc:
load local pal symbols
--HG--
extra : convert_revision : 0c81badf77321d5e1a060dcae2d42204e5a1fc84
656 lines
17 KiB
C++
656 lines
17 KiB
C++
/* $Id$ */
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#include "arch/alpha/alpha_memory.hh"
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#include "arch/alpha/isa_traits.hh"
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#include "arch/alpha/osfpal.hh"
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#include "base/kgdb.h"
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#include "base/remote_gdb.hh"
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#include "base/stats/events.hh"
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#include "cpu/base_cpu.hh"
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#include "cpu/exec_context.hh"
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#include "cpu/fast_cpu/fast_cpu.hh"
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#include "kern/kernel_stats.hh"
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#include "sim/debug.hh"
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#include "sim/sim_events.hh"
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#ifdef FULL_SYSTEM
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#ifndef SYSTEM_EV5
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#error This code is only valid for EV5 systems
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#endif
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////////////////////////////////////////////////////////////////////////
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//
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//
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//
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void
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AlphaISA::swap_palshadow(RegFile *regs, bool use_shadow)
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{
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if (regs->pal_shadow == use_shadow)
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panic("swap_palshadow: wrong PAL shadow state");
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regs->pal_shadow = use_shadow;
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for (int i = 0; i < NumIntRegs; i++) {
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if (reg_redir[i]) {
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IntReg temp = regs->intRegFile[i];
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regs->intRegFile[i] = regs->palregs[i];
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regs->palregs[i] = temp;
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}
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}
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}
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////////////////////////////////////////////////////////////////////////
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//
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// Machine dependent functions
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//
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void
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AlphaISA::initCPU(RegFile *regs)
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{
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initIPRs(regs);
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// CPU comes up with PAL regs enabled
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swap_palshadow(regs, true);
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regs->pc = regs->ipr[IPR_PAL_BASE] + fault_addr[Reset_Fault];
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regs->npc = regs->pc + sizeof(MachInst);
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}
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////////////////////////////////////////////////////////////////////////
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//
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// alpha exceptions - value equals trap address, update with MD_FAULT_TYPE
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//
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Addr
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AlphaISA::fault_addr[Num_Faults] = {
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0x0000, /* No_Fault */
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0x0001, /* Reset_Fault */
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0x0401, /* Machine_Check_Fault */
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0x0501, /* Arithmetic_Fault */
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0x0101, /* Interrupt_Fault */
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0x0201, /* Ndtb_Miss_Fault */
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0x0281, /* Pdtb_Miss_Fault */
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0x0301, /* Alignment_Fault */
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0x0381, /* DTB_Fault_Fault */
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0x0381, /* DTB_Acv_Fault */
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0x0181, /* ITB_Miss_Fault */
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0x0181, /* ITB_Fault_Fault */
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0x0081, /* ITB_Acv_Fault */
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0x0481, /* Unimplemented_Opcode_Fault */
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0x0581, /* Fen_Fault */
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0x2001, /* Pal_Fault */
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0x0501, /* Integer_Overflow_Fault: maps to Arithmetic_Fault */
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};
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const int AlphaISA::reg_redir[AlphaISA::NumIntRegs] = {
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/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0,
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/* 8 */ 1, 1, 1, 1, 1, 1, 1, 0,
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/* 16 */ 0, 0, 0, 0, 0, 0, 0, 0,
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/* 24 */ 0, 1, 0, 0, 0, 0, 0, 0 };
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////////////////////////////////////////////////////////////////////////
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//
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//
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//
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void
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AlphaISA::initIPRs(RegFile *regs)
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{
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uint64_t *ipr = regs->ipr;
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bzero((char *)ipr, NumInternalProcRegs * sizeof(InternalProcReg));
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ipr[IPR_PAL_BASE] = PAL_BASE;
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ipr[IPR_MCSR] = 0x6;
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}
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template <class XC>
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void
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AlphaISA::processInterrupts(XC *xc)
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{
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//Check if there are any outstanding interrupts
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//Handle the interrupts
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int ipl = 0;
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int summary = 0;
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IntReg *ipr = xc->getIprPtr();
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check_interrupts = 0;
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if (ipr[IPR_ASTRR])
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panic("asynchronous traps not implemented\n");
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if (ipr[IPR_SIRR]) {
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for (int i = INTLEVEL_SOFTWARE_MIN;
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i < INTLEVEL_SOFTWARE_MAX; i++) {
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if (ipr[IPR_SIRR] & (ULL(1) << i)) {
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// See table 4-19 of the 21164 hardware reference
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ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
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summary |= (ULL(1) << i);
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}
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}
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}
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uint64_t interrupts = xc->intr_status();
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if (interrupts) {
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for (int i = INTLEVEL_EXTERNAL_MIN;
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i < INTLEVEL_EXTERNAL_MAX; i++) {
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if (interrupts & (ULL(1) << i)) {
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// See table 4-19 of the 21164 hardware reference
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ipl = i;
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summary |= (ULL(1) << i);
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}
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}
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}
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if (ipl && ipl > ipr[IPR_IPLR]) {
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ipr[IPR_ISR] = summary;
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ipr[IPR_INTID] = ipl;
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xc->trap(Interrupt_Fault);
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DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
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ipr[IPR_IPLR], ipl, summary);
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}
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}
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template <class XC>
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void
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AlphaISA::zeroRegisters(XC *xc)
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{
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// Insure ISA semantics
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// (no longer very clean due to the change in setIntReg() in the
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// cpu model. Consider changing later.)
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xc->xc->setIntReg(ZeroReg, 0);
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xc->xc->setFloatRegDouble(ZeroReg, 0.0);
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}
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void
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ExecContext::ev5_trap(Fault fault)
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{
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DPRINTF(Fault, "Fault %s at PC: %#x\n", FaultName(fault), regs.pc);
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cpu->recordEvent(csprintf("Fault %s", FaultName(fault)));
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assert(!misspeculating());
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kernelStats->fault(fault);
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if (fault == Arithmetic_Fault)
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panic("Arithmetic traps are unimplemented!");
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AlphaISA::InternalProcReg *ipr = regs.ipr;
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// exception restart address
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if (fault != Interrupt_Fault || !PC_PAL(regs.pc))
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ipr[AlphaISA::IPR_EXC_ADDR] = regs.pc;
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if (fault == Pal_Fault || fault == Arithmetic_Fault /* ||
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fault == Interrupt_Fault && !PC_PAL(regs.pc) */) {
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// traps... skip faulting instruction
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ipr[AlphaISA::IPR_EXC_ADDR] += 4;
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}
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if (!PC_PAL(regs.pc))
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AlphaISA::swap_palshadow(®s, true);
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regs.pc = ipr[AlphaISA::IPR_PAL_BASE] + AlphaISA::fault_addr[fault];
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regs.npc = regs.pc + sizeof(MachInst);
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}
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void
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AlphaISA::intr_post(RegFile *regs, Fault fault, Addr pc)
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{
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InternalProcReg *ipr = regs->ipr;
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bool use_pc = (fault == No_Fault);
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if (fault == Arithmetic_Fault)
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panic("arithmetic faults NYI...");
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// compute exception restart address
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if (use_pc || fault == Pal_Fault || fault == Arithmetic_Fault) {
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// traps... skip faulting instruction
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ipr[IPR_EXC_ADDR] = regs->pc + 4;
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} else {
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// fault, post fault at excepting instruction
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ipr[IPR_EXC_ADDR] = regs->pc;
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}
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// jump to expection address (PAL PC bit set here as well...)
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if (!use_pc)
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regs->npc = ipr[IPR_PAL_BASE] + fault_addr[fault];
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else
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regs->npc = ipr[IPR_PAL_BASE] + pc;
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// that's it! (orders of magnitude less painful than x86)
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}
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bool AlphaISA::check_interrupts = false;
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Fault
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ExecContext::hwrei()
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{
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uint64_t *ipr = regs.ipr;
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if (!PC_PAL(regs.pc))
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return Unimplemented_Opcode_Fault;
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setNextPC(ipr[AlphaISA::IPR_EXC_ADDR]);
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if (!misspeculating()) {
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kernelStats->hwrei();
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if ((ipr[AlphaISA::IPR_EXC_ADDR] & 1) == 0)
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AlphaISA::swap_palshadow(®s, false);
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AlphaISA::check_interrupts = true;
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}
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// FIXME: XXX check for interrupts? XXX
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return No_Fault;
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}
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uint64_t
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ExecContext::readIpr(int idx, Fault &fault)
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{
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uint64_t *ipr = regs.ipr;
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uint64_t retval = 0; // return value, default 0
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switch (idx) {
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case AlphaISA::IPR_PALtemp0:
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case AlphaISA::IPR_PALtemp1:
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case AlphaISA::IPR_PALtemp2:
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case AlphaISA::IPR_PALtemp3:
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case AlphaISA::IPR_PALtemp4:
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case AlphaISA::IPR_PALtemp5:
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case AlphaISA::IPR_PALtemp6:
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case AlphaISA::IPR_PALtemp7:
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case AlphaISA::IPR_PALtemp8:
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case AlphaISA::IPR_PALtemp9:
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case AlphaISA::IPR_PALtemp10:
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case AlphaISA::IPR_PALtemp11:
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case AlphaISA::IPR_PALtemp12:
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case AlphaISA::IPR_PALtemp13:
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case AlphaISA::IPR_PALtemp14:
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case AlphaISA::IPR_PALtemp15:
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case AlphaISA::IPR_PALtemp16:
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case AlphaISA::IPR_PALtemp17:
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case AlphaISA::IPR_PALtemp18:
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case AlphaISA::IPR_PALtemp19:
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case AlphaISA::IPR_PALtemp20:
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case AlphaISA::IPR_PALtemp21:
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case AlphaISA::IPR_PALtemp22:
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case AlphaISA::IPR_PALtemp23:
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case AlphaISA::IPR_PAL_BASE:
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case AlphaISA::IPR_IVPTBR:
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case AlphaISA::IPR_DC_MODE:
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case AlphaISA::IPR_MAF_MODE:
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case AlphaISA::IPR_ISR:
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case AlphaISA::IPR_EXC_ADDR:
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case AlphaISA::IPR_IC_PERR_STAT:
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case AlphaISA::IPR_DC_PERR_STAT:
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case AlphaISA::IPR_MCSR:
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case AlphaISA::IPR_ASTRR:
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case AlphaISA::IPR_ASTER:
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case AlphaISA::IPR_SIRR:
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case AlphaISA::IPR_ICSR:
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case AlphaISA::IPR_ICM:
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case AlphaISA::IPR_DTB_CM:
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case AlphaISA::IPR_IPLR:
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case AlphaISA::IPR_INTID:
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case AlphaISA::IPR_PMCTR:
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// no side-effect
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retval = ipr[idx];
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break;
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case AlphaISA::IPR_CC:
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retval |= ipr[idx] & ULL(0xffffffff00000000);
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retval |= curTick & ULL(0x00000000ffffffff);
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break;
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case AlphaISA::IPR_VA:
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retval = ipr[idx];
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break;
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case AlphaISA::IPR_VA_FORM:
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case AlphaISA::IPR_MM_STAT:
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case AlphaISA::IPR_IFAULT_VA_FORM:
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case AlphaISA::IPR_EXC_MASK:
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case AlphaISA::IPR_EXC_SUM:
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retval = ipr[idx];
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break;
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case AlphaISA::IPR_DTB_PTE:
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{
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AlphaISA::PTE &pte = dtb->index(!misspeculating());
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retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32;
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retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8;
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retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12;
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retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1;
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retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2;
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retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4;
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retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57;
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}
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break;
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// write only registers
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case AlphaISA::IPR_HWINT_CLR:
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case AlphaISA::IPR_SL_XMIT:
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case AlphaISA::IPR_DC_FLUSH:
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case AlphaISA::IPR_IC_FLUSH:
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case AlphaISA::IPR_ALT_MODE:
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case AlphaISA::IPR_DTB_IA:
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case AlphaISA::IPR_DTB_IAP:
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case AlphaISA::IPR_ITB_IA:
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case AlphaISA::IPR_ITB_IAP:
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fault = Unimplemented_Opcode_Fault;
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break;
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default:
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// invalid IPR
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fault = Unimplemented_Opcode_Fault;
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break;
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}
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return retval;
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}
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#ifdef DEBUG
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// Cause the simulator to break when changing to the following IPL
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int break_ipl = -1;
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#endif
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Fault
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ExecContext::setIpr(int idx, uint64_t val)
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{
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uint64_t *ipr = regs.ipr;
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uint64_t old;
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if (misspeculating())
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return No_Fault;
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switch (idx) {
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case AlphaISA::IPR_PALtemp0:
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case AlphaISA::IPR_PALtemp1:
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case AlphaISA::IPR_PALtemp2:
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case AlphaISA::IPR_PALtemp3:
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case AlphaISA::IPR_PALtemp4:
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case AlphaISA::IPR_PALtemp5:
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case AlphaISA::IPR_PALtemp6:
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case AlphaISA::IPR_PALtemp7:
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case AlphaISA::IPR_PALtemp8:
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case AlphaISA::IPR_PALtemp9:
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case AlphaISA::IPR_PALtemp10:
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case AlphaISA::IPR_PALtemp11:
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case AlphaISA::IPR_PALtemp12:
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case AlphaISA::IPR_PALtemp13:
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case AlphaISA::IPR_PALtemp14:
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case AlphaISA::IPR_PALtemp15:
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case AlphaISA::IPR_PALtemp16:
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case AlphaISA::IPR_PALtemp17:
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case AlphaISA::IPR_PALtemp18:
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case AlphaISA::IPR_PALtemp19:
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case AlphaISA::IPR_PALtemp20:
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case AlphaISA::IPR_PALtemp21:
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case AlphaISA::IPR_PALtemp22:
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case AlphaISA::IPR_PAL_BASE:
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case AlphaISA::IPR_IC_PERR_STAT:
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case AlphaISA::IPR_DC_PERR_STAT:
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case AlphaISA::IPR_PMCTR:
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// write entire quad w/ no side-effect
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ipr[idx] = val;
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break;
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case AlphaISA::IPR_CC_CTL:
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// This IPR resets the cycle counter. We assume this only
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// happens once... let's verify that.
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assert(ipr[idx] == 0);
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ipr[idx] = 1;
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break;
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case AlphaISA::IPR_CC:
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// This IPR only writes the upper 64 bits. It's ok to write
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// all 64 here since we mask out the lower 32 in rpcc (see
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// isa_desc).
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ipr[idx] = val;
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break;
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case AlphaISA::IPR_PALtemp23:
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// write entire quad w/ no side-effect
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old = ipr[idx];
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ipr[idx] = val;
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kernelStats->context(old, val);
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break;
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case AlphaISA::IPR_DTB_PTE:
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// write entire quad w/ no side-effect, tag is forthcoming
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ipr[idx] = val;
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break;
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case AlphaISA::IPR_EXC_ADDR:
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// second least significant bit in PC is always zero
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ipr[idx] = val & ~2;
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break;
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case AlphaISA::IPR_ASTRR:
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case AlphaISA::IPR_ASTER:
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// only write least significant four bits - privilege mask
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ipr[idx] = val & 0xf;
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break;
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case AlphaISA::IPR_IPLR:
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#ifdef DEBUG
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if (break_ipl != -1 && break_ipl == (val & 0x1f))
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debug_break();
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#endif
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// only write least significant five bits - interrupt level
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ipr[idx] = val & 0x1f;
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kernelStats->swpipl(ipr[idx]);
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break;
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case AlphaISA::IPR_DTB_CM:
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if (val & 0x18)
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kernelStats->mode(Kernel::user);
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else
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kernelStats->mode(Kernel::kernel);
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case AlphaISA::IPR_ICM:
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// only write two mode bits - processor mode
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ipr[idx] = val & 0x18;
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break;
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case AlphaISA::IPR_ALT_MODE:
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// only write two mode bits - processor mode
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ipr[idx] = val & 0x18;
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break;
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case AlphaISA::IPR_MCSR:
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// more here after optimization...
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ipr[idx] = val;
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break;
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case AlphaISA::IPR_SIRR:
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// only write software interrupt mask
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ipr[idx] = val & 0x7fff0;
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break;
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case AlphaISA::IPR_ICSR:
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ipr[idx] = val & ULL(0xffffff0300);
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break;
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case AlphaISA::IPR_IVPTBR:
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case AlphaISA::IPR_MVPTBR:
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ipr[idx] = val & ULL(0xffffffffc0000000);
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break;
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case AlphaISA::IPR_DC_TEST_CTL:
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ipr[idx] = val & 0x1ffb;
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break;
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case AlphaISA::IPR_DC_MODE:
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case AlphaISA::IPR_MAF_MODE:
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ipr[idx] = val & 0x3f;
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break;
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case AlphaISA::IPR_ITB_ASN:
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ipr[idx] = val & 0x7f0;
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break;
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case AlphaISA::IPR_DTB_ASN:
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ipr[idx] = val & ULL(0xfe00000000000000);
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break;
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case AlphaISA::IPR_EXC_SUM:
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case AlphaISA::IPR_EXC_MASK:
|
|
// any write to this register clears it
|
|
ipr[idx] = 0;
|
|
break;
|
|
|
|
case AlphaISA::IPR_INTID:
|
|
case AlphaISA::IPR_SL_RCV:
|
|
case AlphaISA::IPR_MM_STAT:
|
|
case AlphaISA::IPR_ITB_PTE_TEMP:
|
|
case AlphaISA::IPR_DTB_PTE_TEMP:
|
|
// read-only registers
|
|
return Unimplemented_Opcode_Fault;
|
|
|
|
case AlphaISA::IPR_HWINT_CLR:
|
|
case AlphaISA::IPR_SL_XMIT:
|
|
case AlphaISA::IPR_DC_FLUSH:
|
|
case AlphaISA::IPR_IC_FLUSH:
|
|
// the following are write only
|
|
ipr[idx] = val;
|
|
break;
|
|
|
|
case AlphaISA::IPR_DTB_IA:
|
|
// really a control write
|
|
ipr[idx] = 0;
|
|
|
|
dtb->flushAll();
|
|
break;
|
|
|
|
case AlphaISA::IPR_DTB_IAP:
|
|
// really a control write
|
|
ipr[idx] = 0;
|
|
|
|
dtb->flushProcesses();
|
|
break;
|
|
|
|
case AlphaISA::IPR_DTB_IS:
|
|
// really a control write
|
|
ipr[idx] = val;
|
|
|
|
dtb->flushAddr(val, DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]));
|
|
break;
|
|
|
|
case AlphaISA::IPR_DTB_TAG: {
|
|
struct AlphaISA::PTE pte;
|
|
|
|
// FIXME: granularity hints NYI...
|
|
if (DTB_PTE_GH(ipr[AlphaISA::IPR_DTB_PTE]) != 0)
|
|
panic("PTE GH field != 0");
|
|
|
|
// write entire quad
|
|
ipr[idx] = val;
|
|
|
|
// construct PTE for new entry
|
|
pte.ppn = DTB_PTE_PPN(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.xre = DTB_PTE_XRE(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.xwe = DTB_PTE_XWE(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.fonr = DTB_PTE_FONR(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.fonw = DTB_PTE_FONW(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.asma = DTB_PTE_ASMA(ipr[AlphaISA::IPR_DTB_PTE]);
|
|
pte.asn = DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]);
|
|
|
|
// insert new TAG/PTE value into data TLB
|
|
dtb->insert(val, pte);
|
|
}
|
|
break;
|
|
|
|
case AlphaISA::IPR_ITB_PTE: {
|
|
struct AlphaISA::PTE pte;
|
|
|
|
// FIXME: granularity hints NYI...
|
|
if (ITB_PTE_GH(val) != 0)
|
|
panic("PTE GH field != 0");
|
|
|
|
// write entire quad
|
|
ipr[idx] = val;
|
|
|
|
// construct PTE for new entry
|
|
pte.ppn = ITB_PTE_PPN(val);
|
|
pte.xre = ITB_PTE_XRE(val);
|
|
pte.xwe = 0;
|
|
pte.fonr = ITB_PTE_FONR(val);
|
|
pte.fonw = ITB_PTE_FONW(val);
|
|
pte.asma = ITB_PTE_ASMA(val);
|
|
pte.asn = ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]);
|
|
|
|
// insert new TAG/PTE value into data TLB
|
|
itb->insert(ipr[AlphaISA::IPR_ITB_TAG], pte);
|
|
}
|
|
break;
|
|
|
|
case AlphaISA::IPR_ITB_IA:
|
|
// really a control write
|
|
ipr[idx] = 0;
|
|
|
|
itb->flushAll();
|
|
break;
|
|
|
|
case AlphaISA::IPR_ITB_IAP:
|
|
// really a control write
|
|
ipr[idx] = 0;
|
|
|
|
itb->flushProcesses();
|
|
break;
|
|
|
|
case AlphaISA::IPR_ITB_IS:
|
|
// really a control write
|
|
ipr[idx] = val;
|
|
|
|
itb->flushAddr(val, ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]));
|
|
break;
|
|
|
|
default:
|
|
// invalid IPR
|
|
return Unimplemented_Opcode_Fault;
|
|
}
|
|
|
|
// no error...
|
|
return No_Fault;
|
|
}
|
|
|
|
/**
|
|
* Check for special simulator handling of specific PAL calls.
|
|
* If return value is false, actual PAL call will be suppressed.
|
|
*/
|
|
bool
|
|
ExecContext::simPalCheck(int palFunc)
|
|
{
|
|
kernelStats->callpal(palFunc);
|
|
|
|
switch (palFunc) {
|
|
case PAL::halt:
|
|
halt();
|
|
if (--System::numSystemsRunning == 0)
|
|
new SimExitEvent("all cpus halted");
|
|
break;
|
|
|
|
case PAL::bpt:
|
|
case PAL::bugchk:
|
|
if (system->breakpoint())
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
//Forward instantiation for FastCPU object
|
|
template
|
|
void AlphaISA::processInterrupts(FastCPU *xc);
|
|
|
|
//Forward instantiation for FastCPU object
|
|
template
|
|
void AlphaISA::zeroRegisters(FastCPU *xc);
|
|
|
|
#endif // FULL_SYSTEM
|