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625 lines
13 KiB
C
625 lines
13 KiB
C
/* mem.c --- memory for RX simulator.
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Copyright (C) 2005-2021 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This slows down the simulator and we get some false negatives from
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gcc, like when it uses a long-sized hole to hold a byte-sized
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variable, knowing that it doesn't care about the other bits. But,
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if you need to track down a read-from-unitialized bug, set this to
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1. */
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#define RDCHECK 0
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "opcode/rx.h"
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#include "mem.h"
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#include "cpu.h"
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#include "syscalls.h"
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#include "misc.h"
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#include "err.h"
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#define L1_BITS (10)
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#define L2_BITS (10)
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#define OFF_BITS PAGE_BITS
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#define L1_LEN (1 << L1_BITS)
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#define L2_LEN (1 << L2_BITS)
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#define OFF_LEN (1 << OFF_BITS)
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static unsigned char **pt[L1_LEN];
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static unsigned char **ptr[L1_LEN];
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static RX_Opcode_Decoded ***ptdc[L1_LEN];
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/* [ get=0/put=1 ][ byte size ] */
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static unsigned int mem_counters[2][5];
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#define COUNT(isput,bytes) \
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if (verbose && enable_counting) mem_counters[isput][bytes]++
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void
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init_mem (void)
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{
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int i, j;
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for (i = 0; i < L1_LEN; i++)
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if (pt[i])
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{
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for (j = 0; j < L2_LEN; j++)
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if (pt[i][j])
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free (pt[i][j]);
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free (pt[i]);
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}
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memset (pt, 0, sizeof (pt));
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memset (ptr, 0, sizeof (ptr));
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memset (mem_counters, 0, sizeof (mem_counters));
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}
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unsigned char *
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rx_mem_ptr (unsigned long address, enum mem_ptr_action action)
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{
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int pt1 = (address >> (L2_BITS + OFF_BITS)) & ((1 << L1_BITS) - 1);
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int pt2 = (address >> OFF_BITS) & ((1 << L2_BITS) - 1);
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int pto = address & ((1 << OFF_BITS) - 1);
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if (address == 0)
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execution_error (SIM_ERR_NULL_POINTER_DEREFERENCE, 0);
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if (pt[pt1] == 0)
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{
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pt[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
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ptr[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
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ptdc[pt1] = (RX_Opcode_Decoded ***) calloc (L2_LEN, sizeof (RX_Opcode_Decoded ***));
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}
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if (pt[pt1][pt2] == 0)
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{
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if (action == MPA_READING)
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execution_error (SIM_ERR_READ_UNWRITTEN_PAGES, address);
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pt[pt1][pt2] = (unsigned char *) calloc (OFF_LEN, 1);
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ptr[pt1][pt2] = (unsigned char *) calloc (OFF_LEN, 1);
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ptdc[pt1][pt2] = (RX_Opcode_Decoded **) calloc (OFF_LEN, sizeof(RX_Opcode_Decoded *));
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}
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else if (action == MPA_READING
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&& ptr[pt1][pt2][pto] == MC_UNINIT)
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execution_error (SIM_ERR_READ_UNWRITTEN_BYTES, address);
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if (action == MPA_WRITING)
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{
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int pto_dc;
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if (ptr[pt1][pt2][pto] == MC_PUSHED_PC)
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execution_error (SIM_ERR_CORRUPT_STACK, address);
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ptr[pt1][pt2][pto] = MC_DATA;
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/* The instruction decoder doesn't store it's decoded instructions
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at word swapped addresses. Therefore, when clearing the decode
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cache, we have to account for that here. */
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pto_dc = pto ^ (rx_big_endian ? 3 : 0);
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if (ptdc[pt1][pt2][pto_dc])
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{
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free (ptdc[pt1][pt2][pto_dc]);
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ptdc[pt1][pt2][pto_dc] = NULL;
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}
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}
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if (action == MPA_CONTENT_TYPE)
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return (unsigned char *) (ptr[pt1][pt2] + pto);
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if (action == MPA_DECODE_CACHE)
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return (unsigned char *) (ptdc[pt1][pt2] + pto);
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return pt[pt1][pt2] + pto;
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}
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RX_Opcode_Decoded **
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rx_mem_decode_cache (unsigned long address)
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{
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return (RX_Opcode_Decoded **) rx_mem_ptr (address, MPA_DECODE_CACHE);
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}
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static inline int
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is_reserved_address (unsigned int address)
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{
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return (address >= 0x00020000 && address < 0x00080000)
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|| (address >= 0x00100000 && address < 0x01000000)
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|| (address >= 0x08000000 && address < 0xff000000);
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}
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static void
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used (int rstart, int i, int j)
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{
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int rend = i << (L2_BITS + OFF_BITS);
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rend += j << OFF_BITS;
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if (rstart == 0xe0000 && rend == 0xe1000)
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return;
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printf ("mem: %08x - %08x (%dk bytes)\n", rstart, rend - 1,
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(rend - rstart) / 1024);
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}
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static char *
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mcs (int isput, int bytes)
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{
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return comma (mem_counters[isput][bytes]);
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}
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void
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mem_usage_stats ()
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{
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int i, j;
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int rstart = 0;
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int pending = 0;
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for (i = 0; i < L1_LEN; i++)
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if (pt[i])
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{
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for (j = 0; j < L2_LEN; j++)
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if (pt[i][j])
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{
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if (!pending)
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{
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pending = 1;
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rstart = (i << (L2_BITS + OFF_BITS)) + (j << OFF_BITS);
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}
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}
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else if (pending)
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{
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pending = 0;
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used (rstart, i, j);
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}
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}
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else
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{
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if (pending)
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{
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pending = 0;
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used (rstart, i, 0);
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}
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}
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/* mem foo: 123456789012 123456789012 123456789012 123456789012
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123456789012 */
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printf (" byte short 3byte long"
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" opcode\n");
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if (verbose > 1)
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{
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/* Only use comma separated numbers when being very verbose.
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Comma separated numbers are hard to parse in awk scripts. */
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printf ("mem get: %12s %12s %12s %12s %12s\n", mcs (0, 1), mcs (0, 2),
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mcs (0, 3), mcs (0, 4), mcs (0, 0));
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printf ("mem put: %12s %12s %12s %12s\n", mcs (1, 1), mcs (1, 2),
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mcs (1, 3), mcs (1, 4));
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}
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else
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{
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printf ("mem get: %12u %12u %12u %12u %12u\n",
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mem_counters[0][1], mem_counters[0][2],
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mem_counters[0][3], mem_counters[0][4],
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mem_counters[0][0]);
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printf ("mem put: %12u %12u %12u %12u\n",
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mem_counters [1][1], mem_counters [1][2],
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mem_counters [1][3], mem_counters [1][4]);
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}
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}
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unsigned long
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mem_usage_cycles (void)
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{
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unsigned long rv = mem_counters[0][0];
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rv += mem_counters[0][1] * 1;
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rv += mem_counters[0][2] * 2;
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rv += mem_counters[0][3] * 3;
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rv += mem_counters[0][4] * 4;
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rv += mem_counters[1][1] * 1;
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rv += mem_counters[1][2] * 2;
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rv += mem_counters[1][3] * 3;
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rv += mem_counters[1][4] * 4;
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return rv;
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}
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static int tpr = 0;
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static void
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s (int address, char *dir)
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{
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if (tpr == 0)
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printf ("MEM[%08x] %s", address, dir);
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tpr++;
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}
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#define S(d) if (trace) s(address, d)
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static void
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e ()
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{
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if (!trace)
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return;
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tpr--;
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if (tpr == 0)
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printf ("\n");
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}
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static char
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mtypec (int address)
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{
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unsigned char *cp = rx_mem_ptr (address, MPA_CONTENT_TYPE);
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return "udp"[*cp];
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}
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#define E() if (trace) e()
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void
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mem_put_byte (unsigned int address, unsigned char value)
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{
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unsigned char *m;
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char tc = ' ';
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if (trace)
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tc = mtypec (address);
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m = rx_mem_ptr (address, MPA_WRITING);
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if (trace)
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printf (" %02x%c", value, tc);
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*m = value;
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switch (address)
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{
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case 0x0008c02a: /* PA.DR */
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{
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static int old_led = -1;
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int red_on = 0;
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int i;
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if (old_led != value)
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{
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fputs (" ", stdout);
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for (i = 0; i < 8; i++)
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if (value & (1 << i))
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{
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if (! red_on)
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{
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fputs ("\033[31m", stdout);
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red_on = 1;
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}
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fputs (" @", stdout);
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}
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else
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{
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if (red_on)
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{
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fputs ("\033[0m", stdout);
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red_on = 0;
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}
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fputs (" *", stdout);
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}
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if (red_on)
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fputs ("\033[0m", stdout);
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fputs ("\r", stdout);
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fflush (stdout);
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old_led = value;
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}
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}
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break;
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#ifdef CYCLE_STATS
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case 0x0008c02b: /* PB.DR */
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{
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if (value == 0)
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halt_pipeline_stats ();
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else
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reset_pipeline_stats ();
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}
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#endif
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case 0x00088263: /* SCI4.TDR */
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{
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static int pending_exit = 0;
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if (pending_exit == 2)
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{
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step_result = RX_MAKE_EXITED(value);
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longjmp (decode_jmp_buf, 1);
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}
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else if (value == 3)
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pending_exit ++;
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else
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pending_exit = 0;
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putchar(value);
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}
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break;
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default:
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if (is_reserved_address (address))
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generate_access_exception ();
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}
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}
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void
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mem_put_qi (int address, unsigned char value)
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{
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S ("<=");
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mem_put_byte (address, value & 0xff);
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E ();
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COUNT (1, 1);
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}
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#ifdef CYCLE_ACCURATE
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static int tpu_base;
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#endif
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void
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mem_put_hi (int address, unsigned short value)
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{
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S ("<=");
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switch (address)
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{
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#ifdef CYCLE_ACCURATE
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case 0x00088126: /* TPU1.TCNT */
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tpu_base = regs.cycle_count;
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break;
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case 0x00088136: /* TPU2.TCNT */
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tpu_base = regs.cycle_count;
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break;
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#endif
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default:
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if (rx_big_endian)
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{
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mem_put_byte (address, value >> 8);
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mem_put_byte (address + 1, value & 0xff);
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}
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else
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{
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mem_put_byte (address, value & 0xff);
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mem_put_byte (address + 1, value >> 8);
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}
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}
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E ();
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COUNT (1, 2);
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}
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void
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mem_put_psi (int address, unsigned long value)
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{
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S ("<=");
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if (rx_big_endian)
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{
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mem_put_byte (address, value >> 16);
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mem_put_byte (address + 1, (value >> 8) & 0xff);
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mem_put_byte (address + 2, value & 0xff);
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}
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else
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{
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mem_put_byte (address, value & 0xff);
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mem_put_byte (address + 1, (value >> 8) & 0xff);
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mem_put_byte (address + 2, value >> 16);
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}
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E ();
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COUNT (1, 3);
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}
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void
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mem_put_si (int address, unsigned long value)
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{
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S ("<=");
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if (rx_big_endian)
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{
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mem_put_byte (address + 0, (value >> 24) & 0xff);
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mem_put_byte (address + 1, (value >> 16) & 0xff);
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mem_put_byte (address + 2, (value >> 8) & 0xff);
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mem_put_byte (address + 3, value & 0xff);
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}
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else
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{
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mem_put_byte (address + 0, value & 0xff);
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mem_put_byte (address + 1, (value >> 8) & 0xff);
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mem_put_byte (address + 2, (value >> 16) & 0xff);
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mem_put_byte (address + 3, (value >> 24) & 0xff);
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}
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E ();
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COUNT (1, 4);
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}
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void
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mem_put_blk (int address, void *bufptr, int nbytes)
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{
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S ("<=");
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if (enable_counting)
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mem_counters[1][1] += nbytes;
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while (nbytes--)
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mem_put_byte (address++, *(unsigned char *) bufptr++);
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E ();
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}
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unsigned char
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mem_get_pc (int address)
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{
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unsigned char *m = rx_mem_ptr (address, MPA_READING);
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COUNT (0, 0);
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return *m;
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}
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static unsigned char
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mem_get_byte (unsigned int address)
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{
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unsigned char *m;
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S ("=>");
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m = rx_mem_ptr (address, MPA_READING);
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switch (address)
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{
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case 0x00088264: /* SCI4.SSR */
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E();
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return 0x04; /* transmitter empty */
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break;
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default:
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if (trace)
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printf (" %02x%c", *m, mtypec (address));
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if (is_reserved_address (address))
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generate_access_exception ();
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break;
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}
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E ();
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return *m;
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}
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unsigned char
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mem_get_qi (int address)
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{
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unsigned char rv;
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S ("=>");
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rv = mem_get_byte (address);
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COUNT (0, 1);
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E ();
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return rv;
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}
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unsigned short
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mem_get_hi (int address)
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{
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unsigned short rv;
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S ("=>");
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switch (address)
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{
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#ifdef CYCLE_ACCURATE
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case 0x00088126: /* TPU1.TCNT */
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rv = (regs.cycle_count - tpu_base) >> 16;
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break;
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case 0x00088136: /* TPU2.TCNT */
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rv = (regs.cycle_count - tpu_base) >> 0;
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break;
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#endif
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default:
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if (rx_big_endian)
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{
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rv = mem_get_byte (address) << 8;
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rv |= mem_get_byte (address + 1);
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}
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else
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{
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rv = mem_get_byte (address);
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rv |= mem_get_byte (address + 1) << 8;
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}
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}
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COUNT (0, 2);
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E ();
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return rv;
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}
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unsigned long
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mem_get_psi (int address)
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{
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unsigned long rv;
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S ("=>");
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if (rx_big_endian)
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{
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rv = mem_get_byte (address + 2);
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rv |= mem_get_byte (address + 1) << 8;
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rv |= mem_get_byte (address) << 16;
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}
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else
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{
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rv = mem_get_byte (address);
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rv |= mem_get_byte (address + 1) << 8;
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rv |= mem_get_byte (address + 2) << 16;
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}
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COUNT (0, 3);
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E ();
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return rv;
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}
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unsigned long
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mem_get_si (int address)
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{
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unsigned long rv;
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S ("=>");
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if (rx_big_endian)
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{
|
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rv = mem_get_byte (address + 3);
|
|
rv |= mem_get_byte (address + 2) << 8;
|
|
rv |= mem_get_byte (address + 1) << 16;
|
|
rv |= mem_get_byte (address) << 24;
|
|
}
|
|
else
|
|
{
|
|
rv = mem_get_byte (address);
|
|
rv |= mem_get_byte (address + 1) << 8;
|
|
rv |= mem_get_byte (address + 2) << 16;
|
|
rv |= mem_get_byte (address + 3) << 24;
|
|
}
|
|
COUNT (0, 4);
|
|
E ();
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
mem_get_blk (int address, void *bufptr, int nbytes)
|
|
{
|
|
S ("=>");
|
|
if (enable_counting)
|
|
mem_counters[0][1] += nbytes;
|
|
while (nbytes--)
|
|
*(char *) bufptr++ = mem_get_byte (address++);
|
|
E ();
|
|
}
|
|
|
|
int
|
|
sign_ext (int v, int bits)
|
|
{
|
|
if (bits < 32)
|
|
{
|
|
v &= (1 << bits) - 1;
|
|
if (v & (1 << (bits - 1)))
|
|
v -= (1 << bits);
|
|
}
|
|
return v;
|
|
}
|
|
|
|
void
|
|
mem_set_content_type (int address, enum mem_content_type type)
|
|
{
|
|
unsigned char *mt = rx_mem_ptr (address, MPA_CONTENT_TYPE);
|
|
*mt = type;
|
|
}
|
|
|
|
void
|
|
mem_set_content_range (int start_address, int end_address, enum mem_content_type type)
|
|
{
|
|
while (start_address < end_address)
|
|
{
|
|
int sz, ofs;
|
|
unsigned char *mt;
|
|
|
|
sz = end_address - start_address;
|
|
ofs = start_address % L1_LEN;
|
|
if (sz + ofs > L1_LEN)
|
|
sz = L1_LEN - ofs;
|
|
|
|
mt = rx_mem_ptr (start_address, MPA_CONTENT_TYPE);
|
|
memset (mt, type, sz);
|
|
|
|
start_address += sz;
|
|
}
|
|
}
|
|
|
|
enum mem_content_type
|
|
mem_get_content_type (int address)
|
|
{
|
|
unsigned char *mt = rx_mem_ptr (address, MPA_CONTENT_TYPE);
|
|
return *mt;
|
|
}
|