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* sky->devo merge, continued -- left out the r5900 TLB last time! 

* includes a small PR 17224 tweak
gdb-4_18-branch
Frank Ch. Eigler 28 years ago
parent
0d51822e3b
commit
fd6e6422c8
2 changed files with 306 additions and 35 deletions
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  1. 7
      sim/mips/ChangeLog
  2. 334
      sim/mips/sim-main.c

7
sim/mips/ChangeLog
View File

@ -1,3 +1,10 @@
start-sanitize-sky
Thu Oct 29 12:47:46 1998 Frank Ch. Eigler <fche@cygnus.com>
* sim-main.c (tlb_try_match): Include physical address in
scratchpad non-mapping warning.
end-sanitize-sky
start-sanitize-r5900
Thu Oct 29 11:06:30 EST 1998 Frank Ch. Eigler <fche@cygnus.com>

334
sim/mips/sim-main.c
View File

@ -1,26 +1,27 @@
/* Simulator for the MIPS architecture.
/* Copyright (C) 1998, Cygnus Solutions
This file is part of the MIPS sim
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
THIS SOFTWARE IS NOT COPYRIGHTED
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Cygnus offers the following for use in the public domain. Cygnus
makes no warranty with regard to the software or it's performance
and the user accepts the software "AS IS" with all faults.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
CYGNUS DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO
THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
$Revision$
$Date$
*/
#ifndef SIM_MAIN_C
#define SIM_MAIN_C
#include "sim-main.h"
#include "sim-assert.h"
#if !(WITH_IGEN)
#define SIM_MANIFESTS
@ -33,8 +34,12 @@
/*-- simulator engine -------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* start-sanitize-sky */
#ifdef TARGET_SKY
/* Description from page A-22 of the "MIPS IV Instruction Set" manual
(revision 3.1) */
/* Translate a virtual address to a physical address and cache
coherence algorithm describing the mechanism used to resolve the
memory reference. Given the virtual address vAddr, and whether the
@ -51,21 +56,292 @@
NOTE: Normally (RAW == 0), when address translation fails, this
function raises an exception and does not return. */
/* This implementation is for the MIPS R4000 family. See MIPS RISC
Architecture, Kane & Heinrich, Chapter 4. It is no good for any
of the 2000, 3000, or 6000 family.
One possible error in the K&H book of note. K&H has the PFN entry
in the TLB as being 24 bits. The high-order 4 bits would seem to be
unused, as the PFN is only 20-bits long. The 5900 manual shows
this as a 20-bit field. At any rate, the high order 4 bits are
unused.
*/
/* A place to remember the last cache hit. */
static r4000_tlb_entry_t *last_hit = 0;
/* Try to match a single TLB entry. Three possibilities.
1. No match, returns 0
2. Match w/o exception, pAddr and CCA set, returns 1
3. Match w/ exception, in which case tlb_try_match does not return.
*/
INLINE_SIM_MAIN (int)
tlb_try_match (SIM_DESC SD, sim_cpu *CPU, address_word cia, r4000_tlb_entry_t * entry, unsigned32 asid, unsigned32 vAddr, address_word * pAddr, int *CCA, int LorS)
{
unsigned32 page_mask, vpn2_mask;
page_mask = (entry->mask & 0x01ffe000);
vpn2_mask = ~(page_mask | 0x00001fff);
if ((vAddr & vpn2_mask) == (entry->hi & vpn2_mask)
&& ((entry->hi & TLB_HI_ASID_MASK) == asid
|| (entry->hi & TLB_HI_G_MASK) != 0))
{
/* OK. Now, do we match lo0, or lo1? */
unsigned32 offset_mask, vpn_lo_mask, vpn_mask, lo;
offset_mask = (page_mask >> 1) | 0xfff;
vpn_lo_mask = offset_mask + 1;
vpn_mask = ~(offset_mask);
ASSERT(vpn_lo_mask == (-vpn2_mask) >> 1);
ASSERT(vpn_mask ^ vpn_lo_mask == vpn2_mask);
if ((vAddr & vpn_lo_mask) == 0)
{
lo = entry->lo0;
}
else
{
lo = entry->lo1;
}
/* Warn upon attempted use of scratchpad RAM */
if(entry->lo0 & TLB_LO_S_MASK)
{
sim_io_printf(SD,
"Warning: no scratchpad RAM: virtual 0x%08x maps to physical 0x%08x.\n",
vAddr, (vAddr & offset_mask));
/* act as if this is a valid, read/write page. */
lo = TLB_LO_V_MASK | TLB_LO_D_MASK;
/* alternately, act as if this TLB entry is not a match */
/* return 0; */
}
if ((lo & TLB_LO_V_MASK) == 0)
{
COP0_BADVADDR = vAddr;
COP0_CONTEXT_set_BADVPN2((vAddr & 0xffffe) >> 19); /* Top 19 bits */
COP0_ENTRYHI = (vAddr & 0xffffe) | asid;
COP0_RANDOM = rand()%(TLB_SIZE - COP0_WIRED) + COP0_WIRED;
if (LorS == isLOAD)
SignalExceptionTLBInvalidLoad ();
else
SignalExceptionTLBInvalidStore ();
ASSERT(0); /* Signal should never return. */
}
if ((lo & TLB_LO_D_MASK) == 0 && (LorS == isSTORE))
{
COP0_BADVADDR = vAddr;
COP0_CONTEXT_set_BADVPN2((vAddr & 0xffffe) >> 19); /* Top 19 bits */
COP0_ENTRYHI = (vAddr & 0xffffe) | asid;
COP0_RANDOM = rand()%(TLB_SIZE - COP0_WIRED) + COP0_WIRED;
SignalExceptionTLBModification ();
ASSERT(0); /* Signal should never return. */
}
/* Ignore lo.C rule for Cache access */
*pAddr = (((lo & 0x03ffffc0) << 6) & (~offset_mask)) + (vAddr & offset_mask);
*CCA = Uncached; /* FOR NOW, no CCA support. */
last_hit = entry; /* Remember last hit. */
return 1; /* Match */
}
return 0; /* No Match */
}
static void
dump_tlb(SIM_DESC SD, sim_cpu *CPU, address_word cia) {
int i;
/* Now linear search for a match. */
for (i = 0; i < TLB_SIZE; i++)
{
sim_io_eprintf(SD, "%2d: %08x %08x %08x %08x\n", i, TLB[i].mask, TLB[i].hi,
TLB[i].lo0, TLB[i].lo1);
}
}
INLINE_SIM_MAIN (void)
tlb_lookup (SIM_DESC SD, sim_cpu * CPU, address_word cia, unsigned32 vAddr, address_word * pAddr, int *CCA, int LorS)
{
r4000_tlb_entry_t *p;
unsigned32 asid;
int rc;
asid = COP0_ENTRYHI & 0x000000ff;
/* Test last hit first. More code, but probably faster on average. */
if (last_hit)
{
if (tlb_try_match (SD, CPU, cia, last_hit, asid, vAddr, pAddr, CCA, LorS))
return;
}
/* Now linear search for a match. */
for (p = &TLB[0]; p < &TLB[TLB_SIZE]; p++)
{
if (tlb_try_match (SD, CPU, cia, p, asid, vAddr, pAddr, CCA, LorS))
return;
}
/* No match, raise a TLB refill exception. */
COP0_BADVADDR = vAddr;
COP0_CONTEXT_set_BADVPN2((vAddr & 0xffffe) >> 19); /* Top 19 bits */
COP0_ENTRYHI = (vAddr & 0xffffe) | asid;
COP0_RANDOM = rand()%(TLB_SIZE - COP0_WIRED) + COP0_WIRED;
#if 0
sim_io_eprintf(SD, "TLB Refill exception at address 0x%0x\n", vAddr);
dump_tlb(SD, CPU, cia);
#endif
if (LorS == isLOAD)
SignalExceptionTLBRefillLoad ();
else
SignalExceptionTLBRefillStore ();
ASSERT(0); /* Signal should never return. */
}
INLINE_SIM_MAIN (int)
address_translation (SIM_DESC SD,
sim_cpu * CPU,
address_word cia,
address_word vAddr,
int IorD,
int LorS,
address_word * pAddr,
int *CCA,
int raw)
{
unsigned32 operating_mode;
unsigned32 asid, vpn, offset, offset_bits;
#ifdef DEBUG
sim_io_printf (sd, "AddressTranslation(0x%s,%s,%s,...);\n", pr_addr (vAddr), (IorD ? "isDATA" : "isINSTRUCTION"), (LorS ? "iSTORE" : "isLOAD"));
#endif
vAddr &= 0xFFFFFFFF;
/* Determine operating mode. */
operating_mode = SR_KSU;
if (SR & status_ERL || SR & status_EXL)
operating_mode = ksu_kernel;
switch (operating_mode)
{
case ksu_unknown:
sim_io_eprintf (SD, "Invalid operating mode SR.KSU == 0x3. Treated as 0x0.\n");
operating_mode = ksu_kernel;
/* Fall-through */
case ksu_kernel:
/* Map and return for kseg0 and kseg1. */
if ((vAddr & 0xc0000000) == 0x80000000)
{
ASSERT (0x80000000 <= vAddr && vAddr < 0xc0000000);
if (vAddr < 0xa0000000)
{
/* kseg0: Unmapped, Cached */
*pAddr = vAddr - 0x80000000;
*CCA = Uncached; /* For now, until cache model is supported. */
return -1;
}
else
{
/* kseg1: Unmapped, Uncached */
*pAddr = vAddr - 0xa0000000;
*CCA = Uncached;
return -1;
}
}
break;
case ksu_supervisor:
{
/* Address error for 0x80000000->0xbfffffff and 0xe00000000->0xffffffff. */
unsigned32 top_three = vAddr & 0xe0000000;
if (top_three != 0x00000000 && top_three != 0xc0000000)
{
if (LorS == isLOAD)
SignalExceptionAddressLoad ();
else
SignalExceptionAddressStore ();
ASSERT(0); /* Signal should never return. */
}
}
break;
case ksu_user:
{
if (vAddr & 0x80000000)
{
if (LorS == isLOAD)
SignalExceptionAddressLoad ();
else
SignalExceptionAddressStore ();
ASSERT(0); /* Signal should never return. */
}
}
break;
default:
ASSERT(0);
}
/* OK. If we got this far, we're ready to use the normal virtual->physical memory mapping. */
tlb_lookup (SD, CPU, cia, vAddr, pAddr, CCA, LorS);
/* If the preceding call returns, a match was found, and CCA and pAddr have been set. */
return -1;
}
#else /* TARGET_SKY */
/* end-sanitize-sky */
/* Description from page A-22 of the "MIPS IV Instruction Set" manual
(revision 3.1) */
/* Translate a virtual address to a physical address and cache
coherence algorithm describing the mechanism used to resolve the
memory reference. Given the virtual address vAddr, and whether the
reference is to Instructions ot Data (IorD), find the corresponding
physical address (pAddr) and the cache coherence algorithm (CCA)
used to resolve the reference. If the virtual address is in one of
the unmapped address spaces the physical address and the CCA are
determined directly by the virtual address. If the virtual address
is in one of the mapped address spaces then the TLB is used to
determine the physical address and access type; if the required
translation is not present in the TLB or the desired access is not
permitted the function fails and an exception is taken.
NOTE: Normally (RAW == 0), when address translation fails, this
function raises an exception and does not return. */
INLINE_SIM_MAIN
(int)
address_translation (SIM_DESC sd,
sim_cpu *cpu,
sim_cpu * cpu,
address_word cia,
address_word vAddr,
int IorD,
int LorS,
address_word *pAddr,
address_word * pAddr,
int *CCA,
int raw)
{
int res = -1; /* TRUE : Assume good return */
int res = -1; /* TRUE : Assume good return */
#ifdef DEBUG
sim_io_printf(sd,"AddressTranslation(0x%s,%s,%s,...);\n",pr_addr(vAddr),(IorD ? "isDATA" : "isINSTRUCTION"),(LorS ? "iSTORE" : "isLOAD"));
sim_io_printf (sd, "AddressTranslation(0x%s,%s,%s,...);\n", pr_addr (vAddr), (IorD ? "isDATA" : "isINSTRUCTION"), (LorS ? "iSTORE" : "isLOAD"));
#endif
/* Check that the address is valid for this memory model */
@ -74,28 +350,16 @@ address_translation (SIM_DESC sd,
addressess through (mostly) unchanged. */
vAddr &= 0xFFFFFFFF;
*pAddr = vAddr; /* default for isTARGET */
*pAddr = vAddr; /* default for isTARGET */
*CCA = Uncached; /* not used for isHOST */
return (res);
}
/* start-sanitize-sky */
#ifdef TARGET_SKY
if (vAddr >= 0x80000000)
{
if (vAddr < 0xa0000000)
{
*pAddr = vAddr - 0x80000000;
}
else if (vAddr < 0xc0000000)
{
*pAddr = vAddr - 0xa0000000;
}
}
#endif
#endif /* !TARGET_SKY */
/* end-sanitize-sky */
*CCA = Uncached; /* not used for isHOST */
return(res);
}
/* Description from page A-23 of the "MIPS IV Instruction Set" manual
(revision 3.1) */

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