root / target-sh4 / helper.c @ c5d6edc3
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/*
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* SH4 emulation
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*
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* Copyright (c) 2005 Samuel Tardieu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <inttypes.h> |
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#include <signal.h> |
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#include <assert.h> |
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#include "cpu.h" |
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#include "exec-all.h" |
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#define MMU_OK 0 |
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#define MMU_ITLB_MISS (-1) |
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#define MMU_ITLB_MULTIPLE (-2) |
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#define MMU_ITLB_VIOLATION (-3) |
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#define MMU_DTLB_MISS_READ (-4) |
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#define MMU_DTLB_MISS_WRITE (-5) |
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#define MMU_DTLB_INITIAL_WRITE (-6) |
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#define MMU_DTLB_VIOLATION_READ (-7) |
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#define MMU_DTLB_VIOLATION_WRITE (-8) |
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#define MMU_DTLB_MULTIPLE (-9) |
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#define MMU_DTLB_MISS (-10) |
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void do_interrupt(CPUState * env)
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{
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if (loglevel & CPU_LOG_INT) {
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const char *expname; |
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switch (env->exception_index) {
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case 0x0e0: |
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expname = "addr_error";
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break;
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case 0x040: |
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expname = "tlb_miss";
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break;
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case 0x0a0: |
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expname = "tlb_violation";
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break;
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case 0x180: |
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expname = "illegal_instruction";
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break;
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case 0x1a0: |
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expname = "slot_illegal_instruction";
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break;
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case 0x800: |
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expname = "fpu_disable";
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break;
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case 0x820: |
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expname = "slot_fpu";
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break;
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case 0x100: |
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expname = "data_write";
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break;
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case 0x060: |
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expname = "dtlb_miss_write";
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break;
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case 0x0c0: |
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expname = "dtlb_violation_write";
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break;
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case 0x120: |
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expname = "fpu_exception";
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break;
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case 0x080: |
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expname = "initial_page_write";
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break;
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case 0x160: |
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expname = "trapa";
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break;
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default:
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expname = "???";
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break;
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} |
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fprintf(logfile, "exception 0x%03x [%s] raised\n",
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env->exception_index, expname); |
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cpu_dump_state(env, logfile, fprintf, 0);
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} |
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env->ssr = env->sr; |
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env->spc = env->spc; |
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env->sgr = env->gregs[15];
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env->sr |= SR_BL | SR_MD | SR_RB; |
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env->expevt = env->exception_index & 0x7ff;
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switch (env->exception_index) {
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case 0x040: |
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case 0x060: |
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case 0x080: |
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env->pc = env->vbr + 0x400;
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break;
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case 0x140: |
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env->pc = 0xa0000000;
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break;
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default:
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env->pc = env->vbr + 0x100;
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break;
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} |
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} |
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static void update_itlb_use(CPUState * env, int itlbnb) |
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{
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uint8_t or_mask = 0, and_mask = (uint8_t) - 1; |
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switch (itlbnb) {
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case 0: |
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and_mask = 0x7f;
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break;
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case 1: |
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and_mask = 0xe7;
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or_mask = 0x80;
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break;
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case 2: |
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and_mask = 0xfb;
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or_mask = 0x50;
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break;
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case 3: |
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or_mask = 0x2c;
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break;
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} |
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env->mmucr &= (and_mask << 24);
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env->mmucr |= (or_mask << 24);
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} |
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static int itlb_replacement(CPUState * env) |
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{
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if ((env->mmucr & 0xe0000000) == 0xe0000000) |
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return 0; |
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if ((env->mmucr & 0x98000000) == 0x08000000) |
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return 1; |
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if ((env->mmucr & 0x54000000) == 0x04000000) |
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return 2; |
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if ((env->mmucr & 0x2c000000) == 0x00000000) |
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return 3; |
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assert(0);
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} |
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/* Find the corresponding entry in the right TLB
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Return entry, MMU_DTLB_MISS or MMU_DTLB_MULTIPLE
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*/
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static int find_tlb_entry(CPUState * env, target_ulong address, |
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tlb_t * entries, uint8_t nbtlb, int use_asid)
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{
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int match = MMU_DTLB_MISS;
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uint32_t start, end; |
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uint8_t asid; |
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int i;
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asid = env->pteh & 0xff;
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for (i = 0; i < nbtlb; i++) { |
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if (!entries[i].v)
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continue; /* Invalid entry */ |
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if (use_asid && entries[i].asid != asid && !entries[i].sh)
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continue; /* Bad ASID */ |
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#if 0
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switch (entries[i].sz) {
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case 0:
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size = 1024; /* 1kB */
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break;
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case 1:
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size = 4 * 1024; /* 4kB */
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break;
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case 2:
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size = 64 * 1024; /* 64kB */
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break;
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case 3:
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size = 1024 * 1024; /* 1MB */
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break;
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default:
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assert(0);
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}
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#endif
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start = (entries[i].vpn << 10) & ~(entries[i].size - 1); |
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end = start + entries[i].size - 1;
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if (address >= start && address <= end) { /* Match */ |
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if (match != -1) |
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return MMU_DTLB_MULTIPLE; /* Multiple match */ |
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match = i; |
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} |
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} |
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return match;
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} |
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/* Find itlb entry - update itlb from utlb if necessary and asked for
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Return entry, MMU_ITLB_MISS, MMU_ITLB_MULTIPLE or MMU_DTLB_MULTIPLE
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Update the itlb from utlb if update is not 0
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*/
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int find_itlb_entry(CPUState * env, target_ulong address,
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int use_asid, int update) |
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{
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int e, n;
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e = find_tlb_entry(env, address, env->itlb, ITLB_SIZE, use_asid); |
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if (e == MMU_DTLB_MULTIPLE)
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e = MMU_ITLB_MULTIPLE; |
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else if (e == MMU_DTLB_MISS && update) { |
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e = find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid); |
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if (e >= 0) { |
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n = itlb_replacement(env); |
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env->itlb[n] = env->utlb[e]; |
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e = n; |
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} |
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} |
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if (e >= 0) |
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update_itlb_use(env, e); |
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return e;
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} |
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/* Find utlb entry
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Return entry, MMU_DTLB_MISS, MMU_DTLB_MULTIPLE */
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int find_utlb_entry(CPUState * env, target_ulong address, int use_asid) |
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{
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uint8_t urb, urc; |
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/* Increment URC */
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urb = ((env->mmucr) >> 18) & 0x3f; |
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urc = ((env->mmucr) >> 10) & 0x3f; |
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urc++; |
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if (urc == urb || urc == UTLB_SIZE - 1) |
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urc = 0;
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env->mmucr = (env->mmucr & 0xffff03ff) | (urc << 10); |
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/* Return entry */
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return find_tlb_entry(env, address, env->utlb, UTLB_SIZE, use_asid);
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} |
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/* Match address against MMU
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Return MMU_OK, MMU_DTLB_MISS_READ, MMU_DTLB_MISS_WRITE,
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MMU_DTLB_INITIAL_WRITE, MMU_DTLB_VIOLATION_READ,
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MMU_DTLB_VIOLATION_WRITE, MMU_ITLB_MISS,
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MMU_ITLB_MULTIPLE, MMU_ITLB_VIOLATION
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*/
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static int get_mmu_address(CPUState * env, target_ulong * physical, |
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int *prot, target_ulong address,
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int rw, int access_type) |
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{
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int use_asid, is_code, n;
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tlb_t *matching = NULL;
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use_asid = (env->mmucr & MMUCR_SV) == 0 && (env->sr & SR_MD) == 0; |
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is_code = env->pc == address; /* Hack */
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/* Use a hack to find if this is an instruction or data access */
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if (env->pc == address && !(rw & PAGE_WRITE)) {
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n = find_itlb_entry(env, address, use_asid, 1);
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if (n >= 0) { |
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matching = &env->itlb[n]; |
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if ((env->sr & SR_MD) & !(matching->pr & 2)) |
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n = MMU_ITLB_VIOLATION; |
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else
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*prot = PAGE_READ; |
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} |
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} else {
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n = find_utlb_entry(env, address, use_asid); |
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if (n >= 0) { |
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matching = &env->utlb[n]; |
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switch ((matching->pr << 1) | ((env->sr & SR_MD) ? 1 : 0)) { |
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case 0: /* 000 */ |
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case 2: /* 010 */ |
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n = (rw & PAGE_WRITE) ? MMU_DTLB_VIOLATION_WRITE : |
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MMU_DTLB_VIOLATION_READ; |
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break;
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case 1: /* 001 */ |
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case 4: /* 100 */ |
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case 5: /* 101 */ |
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if (rw & PAGE_WRITE)
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n = MMU_DTLB_VIOLATION_WRITE; |
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else
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*prot = PAGE_READ; |
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break;
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case 3: /* 011 */ |
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case 6: /* 110 */ |
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case 7: /* 111 */ |
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*prot = rw & (PAGE_READ | PAGE_WRITE); |
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break;
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} |
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} else if (n == MMU_DTLB_MISS) { |
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n = (rw & PAGE_WRITE) ? MMU_DTLB_MISS_WRITE : |
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MMU_DTLB_MISS_READ; |
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} |
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} |
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if (n >= 0) { |
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*physical = ((matching->ppn << 10) & ~(matching->size - 1)) | |
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(address & (matching->size - 1));
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if ((rw & PAGE_WRITE) & !matching->d)
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n = MMU_DTLB_INITIAL_WRITE; |
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else
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n = MMU_OK; |
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} |
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return n;
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} |
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int get_physical_address(CPUState * env, target_ulong * physical,
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int *prot, target_ulong address,
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int rw, int access_type) |
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{
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/* P1, P2 and P4 areas do not use translation */
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if ((address >= 0x80000000 && address < 0xc0000000) || |
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address >= 0xe0000000) {
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if (!(env->sr & SR_MD)
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&& (address < 0xe0000000 || address > 0xe4000000)) { |
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/* Unauthorized access in user mode (only store queues are available) */
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fprintf(stderr, "Unauthorized access\n");
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return (rw & PAGE_WRITE) ? MMU_DTLB_MISS_WRITE :
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MMU_DTLB_MISS_READ; |
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} |
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/* Mask upper 3 bits */
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*physical = address & 0x1FFFFFFF;
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*prot = PAGE_READ | PAGE_WRITE; |
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return MMU_OK;
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} |
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/* If MMU is disabled, return the corresponding physical page */
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if (!env->mmucr & MMUCR_AT) {
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*physical = address & 0x1FFFFFFF;
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*prot = PAGE_READ | PAGE_WRITE; |
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return MMU_OK;
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} |
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/* We need to resort to the MMU */
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return get_mmu_address(env, physical, prot, address, rw, access_type);
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} |
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|
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int cpu_sh4_handle_mmu_fault(CPUState * env, target_ulong address, int rw, |
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int is_user, int is_softmmu) |
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{
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target_ulong physical, page_offset, page_size; |
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int prot, ret, access_type;
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/* XXXXX */
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#if 0
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fprintf(stderr, "%s pc %08x ad %08x rw %d is_user %d smmu %d\n",
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__func__, env->pc, address, rw, is_user, is_softmmu);
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#endif
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access_type = ACCESS_INT; |
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ret = |
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get_physical_address(env, &physical, &prot, address, rw, |
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access_type); |
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|
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if (ret != MMU_OK) {
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env->tea = address; |
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switch (ret) {
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case MMU_ITLB_MISS:
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case MMU_DTLB_MISS_READ:
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env->exception_index = 0x040;
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break;
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case MMU_DTLB_MULTIPLE:
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case MMU_ITLB_MULTIPLE:
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env->exception_index = 0x140;
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break;
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case MMU_ITLB_VIOLATION:
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env->exception_index = 0x0a0;
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break;
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case MMU_DTLB_MISS_WRITE:
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env->exception_index = 0x060;
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break;
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case MMU_DTLB_INITIAL_WRITE:
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env->exception_index = 0x080;
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break;
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case MMU_DTLB_VIOLATION_READ:
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env->exception_index = 0x0a0;
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break;
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case MMU_DTLB_VIOLATION_WRITE:
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env->exception_index = 0x0c0;
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break;
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default:
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assert(0);
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} |
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return 1; |
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} |
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|
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page_size = TARGET_PAGE_SIZE; |
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page_offset = |
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(address - (address & TARGET_PAGE_MASK)) & ~(page_size - 1);
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address = (address & TARGET_PAGE_MASK) + page_offset; |
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physical = (physical & TARGET_PAGE_MASK) + page_offset; |
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|
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return tlb_set_page(env, address, physical, prot, is_user, is_softmmu);
|
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} |