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https://sourceware.org/git/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
446 lines
10 KiB
C
446 lines
10 KiB
C
/* mem.c --- memory for RL78 simulator.
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Copyright (C) 2011-2024 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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*/
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/* This must come before any other includes. */
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#include "defs.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/rl78.h"
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#include "mem.h"
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#include "cpu.h"
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#define ILLEGAL_OPCODE 0xff
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int rom_limit = 0x100000;
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int ram_base = 0xf8000;
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unsigned char memory[MEM_SIZE];
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#define MASK 0xfffff
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unsigned char initted[MEM_SIZE];
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int skip_init = 0;
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#define tprintf if (trace) printf
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void
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init_mem (void)
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{
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memset (memory, ILLEGAL_OPCODE, sizeof (memory));
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memset (memory + 0xf0000, 0x33, 0x10000);
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memset (initted, 0, sizeof (initted));
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memset (initted + 0xffee0, 1, 0x00120);
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memset (initted + 0xf0000, 1, 0x01000);
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}
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void
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mem_ram_size (int ram_bytes)
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{
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ram_base = 0x100000 - ram_bytes;
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}
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void
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mem_rom_size (int rom_bytes)
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{
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rom_limit = rom_bytes;
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}
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static int mirror_rom_base = 0x01000;
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static int mirror_ram_base = 0xf1000;
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static int mirror_length = 0x7000;
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void
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mem_set_mirror (int rom_base, int ram_base, int length)
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{
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mirror_rom_base = rom_base;
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mirror_ram_base = ram_base;
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mirror_length = length;
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}
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/* ---------------------------------------------------------------------- */
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/* Note: the RL78 memory map has a few surprises. For starters, part
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of the first 64k is mapped to the last 64k, depending on an SFR bit
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and how much RAM the chip has. This is simulated here, as are a
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few peripherals. */
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/* This is stdout. We only care about the data byte, not the upper byte. */
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#define SDR00 0xfff10
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#define SSR00 0xf0100
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#define TS0 0xf01b2
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/* RL78/G13 multiply/divide peripheral. */
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#define MDUC 0xf00e8
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#define MDAL 0xffff0
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#define MDAH 0xffff2
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#define MDBL 0xffff6
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#define MDBH 0xffff4
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#define MDCL 0xf00e0
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#define MDCH 0xf00e2
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static long long mduc_clock = 0;
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static int mda_set = 0;
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#define MDA_SET 15
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static int last_addr_was_mirror;
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static int
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address_mapping (int address)
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{
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address &= MASK;
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if (address >= mirror_ram_base && address < mirror_ram_base + mirror_length)
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{
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address = address - mirror_ram_base + mirror_rom_base;
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if (memory[RL78_SFR_PMC] & 1)
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{
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address |= 0x10000;
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}
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last_addr_was_mirror = 1;
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}
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else
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last_addr_was_mirror = 0;
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return address;
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}
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static void
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mem_put_byte (int address, unsigned char value)
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{
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address = address_mapping (address);
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memory [address] = value;
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initted [address] = 1;
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if (address == SDR00)
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{
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putchar (value);
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fflush (stdout);
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}
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if (address == TS0)
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{
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if (timer_enabled == 2)
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{
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total_clocks = 0;
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pending_clocks = 0;
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memset (counts_per_insn, 0, sizeof (counts_per_insn));
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memory[0xf0180] = 0xff;
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memory[0xf0181] = 0xff;
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}
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if (value & 1)
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timer_enabled = 1;
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else
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timer_enabled = 0;
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}
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if (address == RL78_SFR_SP && value & 1)
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{
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printf ("Warning: SP value 0x%04x truncated at pc=0x%05x\n", value, pc);
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value &= ~1;
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}
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if (! g13_multiply)
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return;
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if (address == MDUC)
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{
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if ((value & 0x81) == 0x81)
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{
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/* division */
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mduc_clock = total_clocks;
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}
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}
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if ((address & ~3) == MDAL)
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{
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mda_set |= (1 << (address & 3));
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if (mda_set == MDA_SET)
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{
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long als, ahs;
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unsigned long alu, ahu;
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long rvs;
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long mdc;
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unsigned long rvu;
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mda_set = 0;
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switch (memory [MDUC] & 0xc8)
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{
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case 0x00:
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alu = mem_get_hi (MDAL);
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ahu = mem_get_hi (MDAH);
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rvu = alu * ahu;
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tprintf ("MDUC: %lu * %lu = %lu\n", alu, ahu, rvu);
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mem_put_hi (MDBL, rvu & 0xffff);
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mem_put_hi (MDBH, rvu >> 16);
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break;
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case 0x08:
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als = sign_ext (mem_get_hi (MDAL), 16);
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ahs = sign_ext (mem_get_hi (MDAH), 16);
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rvs = als * ahs;
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tprintf ("MDUC: %ld * %ld = %ld\n", als, ahs, rvs);
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mem_put_hi (MDBL, rvs & 0xffff);
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mem_put_hi (MDBH, rvs >> 16);
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break;
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case 0x40:
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alu = mem_get_hi (MDAL);
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ahu = mem_get_hi (MDAH);
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rvu = alu * ahu;
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mem_put_hi (MDBL, rvu & 0xffff);
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mem_put_hi (MDBH, rvu >> 16);
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mdc = mem_get_si (MDCL);
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tprintf ("MDUC: %lu * %lu + %lu = ", alu, ahu, mdc);
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mdc += (long) rvu;
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tprintf ("%lu\n", mdc);
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mem_put_si (MDCL, mdc);
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break;
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case 0x48:
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als = sign_ext (mem_get_hi (MDAL), 16);
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ahs = sign_ext (mem_get_hi (MDAH), 16);
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rvs = als * ahs;
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mem_put_hi (MDBL, rvs & 0xffff);
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mem_put_hi (MDBH, rvs >> 16);
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mdc = mem_get_si (MDCL);
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tprintf ("MDUC: %ld * %ld + %ld = ", als, ahs, mdc);
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tprintf ("%ld\n", mdc);
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mdc += rvs;
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mem_put_si (MDCL, mdc);
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break;
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}
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}
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}
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}
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extern long long total_clocks;
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static unsigned char
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mem_get_byte (int address)
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{
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address = address_mapping (address);
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switch (address)
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{
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case SSR00:
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case SSR00 + 1:
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return 0x00;
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case 0xf00f0:
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return 0;
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case 0xf0180:
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case 0xf0181:
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return memory[address];
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case MDUC:
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{
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unsigned char mduc = memory [MDUC];
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if ((mduc & 0x81) == 0x81
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&& total_clocks > mduc_clock + 16)
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{
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unsigned long a, b, q, r;
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memory [MDUC] &= 0xfe;
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a = mem_get_si (MDAL);
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b = mem_get_hi (MDBL) | (mem_get_hi (MDBH) << 16);
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if (b == 0)
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{
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q = ~0;
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r = ~0;
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}
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else
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{
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q = a / b;
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r = a % b;
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}
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tprintf ("MDUC: %lu / %lu = q %lu, r %lu\n", a, b, q, r);
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mem_put_si (MDAL, q);
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mem_put_si (MDCL, r);
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}
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return memory[address];
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}
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case MDCL:
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case MDCL + 1:
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case MDCH:
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case MDCH + 1:
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return memory[address];
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}
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if (address < 0xf1000 && address >= 0xf0000)
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{
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#if 1
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/* Note: comment out this return to trap the invalid access
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instead of returning an "undefined" value. */
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return 0x11;
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#else
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fprintf (stderr, "SFR access error: addr 0x%05x pc 0x%05x\n", address, pc);
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exit (1);
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#endif
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}
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#if 0
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/* Uncomment this block if you want to trap on reads from unwritten memory. */
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if (!skip_init && !initted [address])
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{
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static int uninit_count = 0;
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fprintf (stderr, "\033[31mwarning :read from uninit addr %05x pc %05x\033[0m\n", address, pc);
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uninit_count ++;
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if (uninit_count > 5)
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exit (1);
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}
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#endif
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return memory [address];
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}
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extern jmp_buf decode_jmp_buf;
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#define DO_RETURN(x) longjmp (decode_jmp_buf, x)
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#define CHECK_ALIGNMENT(a,v,m) \
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if (a & m) { printf ("Misalignment addr 0x%05x val 0x%04x pc %05x\n", (int)a, (int)v, (int)pc); \
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DO_RETURN (RL78_MAKE_HIT_BREAK ()); }
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/* ---------------------------------------------------------------------- */
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#define SPECIAL_ADDR(a) (0xffff0 <= a || (0xffee0 <= a && a < 0xfff00))
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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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if (!SPECIAL_ADDR (address))
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tprintf ("\033[34m([%05X]<-%02X)\033[0m", address, value);
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mem_put_byte (address, value);
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}
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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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if (!SPECIAL_ADDR (address))
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tprintf ("\033[34m([%05X]<-%04X)\033[0m", address, value);
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CHECK_ALIGNMENT (address, value, 1);
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if (address > 0xffff8 && address != RL78_SFR_SP)
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{
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tprintf ("Word access to 0x%05x!!\n", address);
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DO_RETURN (RL78_MAKE_HIT_BREAK ());
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}
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mem_put_byte (address, value);
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mem_put_byte (address + 1, value >> 8);
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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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tprintf ("\033[34m([%05X]<-%06lX)\033[0m", address, value);
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mem_put_byte (address, value);
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mem_put_byte (address + 1, value >> 8);
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mem_put_byte (address + 2, value >> 16);
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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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tprintf ("\033[34m([%05X]<-%08lX)\033[0m", address, value);
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CHECK_ALIGNMENT (address, value, 3);
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mem_put_byte (address, value);
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mem_put_byte (address + 1, value >> 8);
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mem_put_byte (address + 2, value >> 16);
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mem_put_byte (address + 3, value >> 24);
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}
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void
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mem_put_blk (int address, const void *bufptr, int nbytes)
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{
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const unsigned char *bp = (unsigned char *)bufptr;
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while (nbytes --)
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mem_put_byte (address ++, *bp ++);
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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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/* Catch obvious problems. */
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if (address >= rom_limit && address < 0xf0000)
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return 0xff;
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/* This does NOT go through the flash mirror area; you cannot
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execute out of the mirror. */
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return memory [address & MASK];
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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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int v;
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v = mem_get_byte (address);
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if (!SPECIAL_ADDR (address))
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tprintf ("\033[35m([%05X]->%04X)\033[0m", address, v);
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if (last_addr_was_mirror)
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{
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pending_clocks += 3;
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tprintf ("ROM read\n");
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}
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return v;
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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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int v;
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v = mem_get_byte (address)
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| mem_get_byte (address + 1) * 256;
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CHECK_ALIGNMENT (address, v, 1);
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if (!SPECIAL_ADDR (address))
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tprintf ("\033[35m([%05X]->%04X)\033[0m", address, v);
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if (last_addr_was_mirror)
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{
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pending_clocks += 3;
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tprintf ("ROM read\n");
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}
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return v;
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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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int v;
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v = mem_get_byte (address)
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| mem_get_byte (address + 1) * 256
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| mem_get_byte (address + 2) * 65536;
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tprintf ("\033[35m([%05X]->%04X)\033[0m", address, v);
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return v;
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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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int v;
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v = mem_get_byte (address)
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| mem_get_byte (address + 1) * 256
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| mem_get_byte (address + 2) * 65536
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| mem_get_byte (address + 2) * 16777216;
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CHECK_ALIGNMENT (address, v, 3);
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tprintf ("(\033[35m[%05X]->%04X)\033[0m", address, v);
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return v;
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}
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void
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mem_get_blk (int address, void *bufptr, int nbytes)
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{
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unsigned char *bp = (unsigned char *)bufptr;
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while (nbytes --)
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*bp ++ = mem_get_byte (address ++);
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}
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int
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sign_ext (int v, int bits)
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{
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if (bits < 8 * sizeof (int))
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{
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v &= (1 << bits) - 1;
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if (v & (1 << (bits - 1)))
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v -= (1 << bits);
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}
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return v;
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}
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