root / target-m68k / helper.c @ c227f099
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/*
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* m68k op helpers
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*
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* Copyright (c) 2006-2007 CodeSourcery
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* Written by Paul Brook
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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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* 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, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h> |
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#include <string.h> |
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#include "config.h" |
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#include "cpu.h" |
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#include "exec-all.h" |
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#include "qemu-common.h" |
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#include "gdbstub.h" |
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#include "helpers.h" |
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#define SIGNBIT (1u << 31) |
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enum m68k_cpuid {
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M68K_CPUID_M5206, |
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M68K_CPUID_M5208, |
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M68K_CPUID_CFV4E, |
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M68K_CPUID_ANY, |
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}; |
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typedef struct m68k_def_t m68k_def_t; |
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struct m68k_def_t {
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const char * name; |
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enum m68k_cpuid id;
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}; |
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static m68k_def_t m68k_cpu_defs[] = {
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{"m5206", M68K_CPUID_M5206},
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{"m5208", M68K_CPUID_M5208},
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{"cfv4e", M68K_CPUID_CFV4E},
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{"any", M68K_CPUID_ANY},
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{NULL, 0}, |
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}; |
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void m68k_cpu_list(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...)) |
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{ |
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unsigned int i; |
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for (i = 0; m68k_cpu_defs[i].name; i++) { |
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(*cpu_fprintf)(f, "%s\n", m68k_cpu_defs[i].name);
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} |
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} |
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static int fpu_gdb_get_reg(CPUState *env, uint8_t *mem_buf, int n) |
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{ |
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if (n < 8) { |
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stfq_p(mem_buf, env->fregs[n]); |
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return 8; |
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} |
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if (n < 11) { |
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/* FP control registers (not implemented) */
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memset(mem_buf, 0, 4); |
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return 4; |
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} |
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return 0; |
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} |
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static int fpu_gdb_set_reg(CPUState *env, uint8_t *mem_buf, int n) |
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{ |
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if (n < 8) { |
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env->fregs[n] = ldfq_p(mem_buf); |
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return 8; |
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} |
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if (n < 11) { |
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/* FP control registers (not implemented) */
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return 4; |
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} |
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return 0; |
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} |
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static void m68k_set_feature(CPUM68KState *env, int feature) |
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{ |
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env->features |= (1u << feature);
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} |
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static int cpu_m68k_set_model(CPUM68KState *env, const char *name) |
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{ |
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m68k_def_t *def; |
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for (def = m68k_cpu_defs; def->name; def++) {
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if (strcmp(def->name, name) == 0) |
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break;
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} |
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if (!def->name)
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return -1; |
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switch (def->id) {
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case M68K_CPUID_M5206:
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_A); |
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break;
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case M68K_CPUID_M5208:
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_A); |
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC); |
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m68k_set_feature(env, M68K_FEATURE_BRAL); |
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m68k_set_feature(env, M68K_FEATURE_CF_EMAC); |
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m68k_set_feature(env, M68K_FEATURE_USP); |
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break;
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case M68K_CPUID_CFV4E:
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_A); |
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_B); |
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m68k_set_feature(env, M68K_FEATURE_BRAL); |
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m68k_set_feature(env, M68K_FEATURE_CF_FPU); |
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m68k_set_feature(env, M68K_FEATURE_CF_EMAC); |
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m68k_set_feature(env, M68K_FEATURE_USP); |
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break;
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case M68K_CPUID_ANY:
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_A); |
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_B); |
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m68k_set_feature(env, M68K_FEATURE_CF_ISA_APLUSC); |
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m68k_set_feature(env, M68K_FEATURE_BRAL); |
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m68k_set_feature(env, M68K_FEATURE_CF_FPU); |
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/* MAC and EMAC are mututally exclusive, so pick EMAC.
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It's mostly backwards compatible. */
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m68k_set_feature(env, M68K_FEATURE_CF_EMAC); |
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m68k_set_feature(env, M68K_FEATURE_CF_EMAC_B); |
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m68k_set_feature(env, M68K_FEATURE_USP); |
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m68k_set_feature(env, M68K_FEATURE_EXT_FULL); |
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m68k_set_feature(env, M68K_FEATURE_WORD_INDEX); |
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break;
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} |
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register_m68k_insns(env); |
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if (m68k_feature (env, M68K_FEATURE_CF_FPU)) {
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gdb_register_coprocessor(env, fpu_gdb_get_reg, fpu_gdb_set_reg, |
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11, "cf-fp.xml", 18); |
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} |
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/* TODO: Add [E]MAC registers. */
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return 0; |
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} |
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void cpu_reset(CPUM68KState *env)
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{ |
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if (qemu_loglevel_mask(CPU_LOG_RESET)) {
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qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
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log_cpu_state(env, 0);
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} |
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memset(env, 0, offsetof(CPUM68KState, breakpoints));
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#if !defined (CONFIG_USER_ONLY)
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env->sr = 0x2700;
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#endif
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m68k_switch_sp(env); |
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/* ??? FP regs should be initialized to NaN. */
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env->cc_op = CC_OP_FLAGS; |
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/* TODO: We should set PC from the interrupt vector. */
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env->pc = 0;
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tlb_flush(env, 1);
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} |
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CPUM68KState *cpu_m68k_init(const char *cpu_model) |
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{ |
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CPUM68KState *env; |
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static int inited; |
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env = qemu_mallocz(sizeof(CPUM68KState));
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cpu_exec_init(env); |
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if (!inited) {
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inited = 1;
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m68k_tcg_init(); |
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} |
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env->cpu_model_str = cpu_model; |
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if (cpu_m68k_set_model(env, cpu_model) < 0) { |
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cpu_m68k_close(env); |
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return NULL; |
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} |
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cpu_reset(env); |
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qemu_init_vcpu(env); |
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return env;
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} |
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void cpu_m68k_close(CPUM68KState *env)
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{ |
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qemu_free(env); |
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} |
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void cpu_m68k_flush_flags(CPUM68KState *env, int cc_op) |
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{ |
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int flags;
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uint32_t src; |
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uint32_t dest; |
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uint32_t tmp; |
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#define HIGHBIT 0x80000000u |
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#define SET_NZ(x) do { \ |
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if ((x) == 0) \ |
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flags |= CCF_Z; \ |
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else if ((int32_t)(x) < 0) \ |
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flags |= CCF_N; \ |
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} while (0) |
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#define SET_FLAGS_SUB(type, utype) do { \ |
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SET_NZ((type)dest); \ |
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tmp = dest + src; \ |
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if ((utype) tmp < (utype) src) \
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flags |= CCF_C; \ |
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if ((1u << (sizeof(type) * 8 - 1)) & (tmp ^ dest) & (tmp ^ src)) \ |
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flags |= CCF_V; \ |
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} while (0) |
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flags = 0;
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src = env->cc_src; |
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dest = env->cc_dest; |
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switch (cc_op) {
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case CC_OP_FLAGS:
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flags = dest; |
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break;
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case CC_OP_LOGIC:
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SET_NZ(dest); |
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break;
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case CC_OP_ADD:
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SET_NZ(dest); |
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if (dest < src)
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flags |= CCF_C; |
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tmp = dest - src; |
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if (HIGHBIT & (src ^ dest) & ~(tmp ^ src))
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flags |= CCF_V; |
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break;
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case CC_OP_SUB:
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SET_FLAGS_SUB(int32_t, uint32_t); |
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break;
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case CC_OP_CMPB:
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SET_FLAGS_SUB(int8_t, uint8_t); |
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break;
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case CC_OP_CMPW:
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SET_FLAGS_SUB(int16_t, uint16_t); |
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break;
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case CC_OP_ADDX:
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SET_NZ(dest); |
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if (dest <= src)
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flags |= CCF_C; |
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tmp = dest - src - 1;
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if (HIGHBIT & (src ^ dest) & ~(tmp ^ src))
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flags |= CCF_V; |
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break;
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case CC_OP_SUBX:
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SET_NZ(dest); |
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tmp = dest + src + 1;
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if (tmp <= src)
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flags |= CCF_C; |
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if (HIGHBIT & (tmp ^ dest) & (tmp ^ src))
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flags |= CCF_V; |
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break;
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case CC_OP_SHIFT:
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SET_NZ(dest); |
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if (src)
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flags |= CCF_C; |
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break;
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default:
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cpu_abort(env, "Bad CC_OP %d", cc_op);
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} |
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env->cc_op = CC_OP_FLAGS; |
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env->cc_dest = flags; |
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} |
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void HELPER(movec)(CPUM68KState *env, uint32_t reg, uint32_t val)
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{ |
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switch (reg) {
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case 0x02: /* CACR */ |
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env->cacr = val; |
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m68k_switch_sp(env); |
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break;
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case 0x04: case 0x05: case 0x06: case 0x07: /* ACR[0-3] */ |
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/* TODO: Implement Access Control Registers. */
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break;
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case 0x801: /* VBR */ |
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env->vbr = val; |
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break;
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/* TODO: Implement control registers. */
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default:
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cpu_abort(env, "Unimplemented control register write 0x%x = 0x%x\n",
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reg, val); |
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} |
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} |
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void HELPER(set_macsr)(CPUM68KState *env, uint32_t val)
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{ |
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uint32_t acc; |
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int8_t exthigh; |
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uint8_t extlow; |
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uint64_t regval; |
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int i;
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if ((env->macsr ^ val) & (MACSR_FI | MACSR_SU)) {
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for (i = 0; i < 4; i++) { |
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regval = env->macc[i]; |
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exthigh = regval >> 40;
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if (env->macsr & MACSR_FI) {
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acc = regval >> 8;
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extlow = regval; |
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} else {
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acc = regval; |
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extlow = regval >> 32;
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} |
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if (env->macsr & MACSR_FI) {
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regval = (((uint64_t)acc) << 8) | extlow;
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regval |= ((int64_t)exthigh) << 40;
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} else if (env->macsr & MACSR_SU) { |
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regval = acc | (((int64_t)extlow) << 32);
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regval |= ((int64_t)exthigh) << 40;
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} else {
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regval = acc | (((uint64_t)extlow) << 32);
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regval |= ((uint64_t)(uint8_t)exthigh) << 40;
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} |
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env->macc[i] = regval; |
329 |
} |
330 |
} |
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env->macsr = val; |
332 |
} |
333 |
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void m68k_switch_sp(CPUM68KState *env)
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{ |
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int new_sp;
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env->sp[env->current_sp] = env->aregs[7];
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new_sp = (env->sr & SR_S && env->cacr & M68K_CACR_EUSP) |
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? M68K_SSP : M68K_USP; |
341 |
env->aregs[7] = env->sp[new_sp];
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env->current_sp = new_sp; |
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} |
344 |
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/* MMU */
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/* TODO: This will need fixing once the MMU is implemented. */
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target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr) |
349 |
{ |
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return addr;
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} |
352 |
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#if defined(CONFIG_USER_ONLY)
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int cpu_m68k_handle_mmu_fault (CPUState *env, target_ulong address, int rw, |
356 |
int mmu_idx, int is_softmmu) |
357 |
{ |
358 |
env->exception_index = EXCP_ACCESS; |
359 |
env->mmu.ar = address; |
360 |
return 1; |
361 |
} |
362 |
|
363 |
#else
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364 |
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365 |
int cpu_m68k_handle_mmu_fault (CPUState *env, target_ulong address, int rw, |
366 |
int mmu_idx, int is_softmmu) |
367 |
{ |
368 |
int prot;
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369 |
|
370 |
address &= TARGET_PAGE_MASK; |
371 |
prot = PAGE_READ | PAGE_WRITE; |
372 |
return tlb_set_page(env, address, address, prot, mmu_idx, is_softmmu);
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} |
374 |
|
375 |
/* Notify CPU of a pending interrupt. Prioritization and vectoring should
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376 |
be handled by the interrupt controller. Real hardware only requests
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377 |
the vector when the interrupt is acknowledged by the CPU. For
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378 |
simplicitly we calculate it when the interrupt is signalled. */
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379 |
void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector) |
380 |
{ |
381 |
env->pending_level = level; |
382 |
env->pending_vector = vector; |
383 |
if (level)
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cpu_interrupt(env, CPU_INTERRUPT_HARD); |
385 |
else
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386 |
cpu_reset_interrupt(env, CPU_INTERRUPT_HARD); |
387 |
} |
388 |
|
389 |
#endif
|
390 |
|
391 |
uint32_t HELPER(bitrev)(uint32_t x) |
392 |
{ |
393 |
x = ((x >> 1) & 0x55555555u) | ((x << 1) & 0xaaaaaaaau); |
394 |
x = ((x >> 2) & 0x33333333u) | ((x << 2) & 0xccccccccu); |
395 |
x = ((x >> 4) & 0x0f0f0f0fu) | ((x << 4) & 0xf0f0f0f0u); |
396 |
return bswap32(x);
|
397 |
} |
398 |
|
399 |
uint32_t HELPER(ff1)(uint32_t x) |
400 |
{ |
401 |
int n;
|
402 |
for (n = 32; x; n--) |
403 |
x >>= 1;
|
404 |
return n;
|
405 |
} |
406 |
|
407 |
uint32_t HELPER(sats)(uint32_t val, uint32_t ccr) |
408 |
{ |
409 |
/* The result has the opposite sign to the original value. */
|
410 |
if (ccr & CCF_V)
|
411 |
val = (((int32_t)val) >> 31) ^ SIGNBIT;
|
412 |
return val;
|
413 |
} |
414 |
|
415 |
uint32_t HELPER(subx_cc)(CPUState *env, uint32_t op1, uint32_t op2) |
416 |
{ |
417 |
uint32_t res; |
418 |
uint32_t old_flags; |
419 |
|
420 |
old_flags = env->cc_dest; |
421 |
if (env->cc_x) {
|
422 |
env->cc_x = (op1 <= op2); |
423 |
env->cc_op = CC_OP_SUBX; |
424 |
res = op1 - (op2 + 1);
|
425 |
} else {
|
426 |
env->cc_x = (op1 < op2); |
427 |
env->cc_op = CC_OP_SUB; |
428 |
res = op1 - op2; |
429 |
} |
430 |
env->cc_dest = res; |
431 |
env->cc_src = op2; |
432 |
cpu_m68k_flush_flags(env, env->cc_op); |
433 |
/* !Z is sticky. */
|
434 |
env->cc_dest &= (old_flags | ~CCF_Z); |
435 |
return res;
|
436 |
} |
437 |
|
438 |
uint32_t HELPER(addx_cc)(CPUState *env, uint32_t op1, uint32_t op2) |
439 |
{ |
440 |
uint32_t res; |
441 |
uint32_t old_flags; |
442 |
|
443 |
old_flags = env->cc_dest; |
444 |
if (env->cc_x) {
|
445 |
res = op1 + op2 + 1;
|
446 |
env->cc_x = (res <= op2); |
447 |
env->cc_op = CC_OP_ADDX; |
448 |
} else {
|
449 |
res = op1 + op2; |
450 |
env->cc_x = (res < op2); |
451 |
env->cc_op = CC_OP_ADD; |
452 |
} |
453 |
env->cc_dest = res; |
454 |
env->cc_src = op2; |
455 |
cpu_m68k_flush_flags(env, env->cc_op); |
456 |
/* !Z is sticky. */
|
457 |
env->cc_dest &= (old_flags | ~CCF_Z); |
458 |
return res;
|
459 |
} |
460 |
|
461 |
uint32_t HELPER(xflag_lt)(uint32_t a, uint32_t b) |
462 |
{ |
463 |
return a < b;
|
464 |
} |
465 |
|
466 |
void HELPER(set_sr)(CPUState *env, uint32_t val)
|
467 |
{ |
468 |
env->sr = val & 0xffff;
|
469 |
m68k_switch_sp(env); |
470 |
} |
471 |
|
472 |
uint32_t HELPER(shl_cc)(CPUState *env, uint32_t val, uint32_t shift) |
473 |
{ |
474 |
uint32_t result; |
475 |
uint32_t cf; |
476 |
|
477 |
shift &= 63;
|
478 |
if (shift == 0) { |
479 |
result = val; |
480 |
cf = env->cc_src & CCF_C; |
481 |
} else if (shift < 32) { |
482 |
result = val << shift; |
483 |
cf = (val >> (32 - shift)) & 1; |
484 |
} else if (shift == 32) { |
485 |
result = 0;
|
486 |
cf = val & 1;
|
487 |
} else /* shift > 32 */ { |
488 |
result = 0;
|
489 |
cf = 0;
|
490 |
} |
491 |
env->cc_src = cf; |
492 |
env->cc_x = (cf != 0);
|
493 |
env->cc_dest = result; |
494 |
return result;
|
495 |
} |
496 |
|
497 |
uint32_t HELPER(shr_cc)(CPUState *env, uint32_t val, uint32_t shift) |
498 |
{ |
499 |
uint32_t result; |
500 |
uint32_t cf; |
501 |
|
502 |
shift &= 63;
|
503 |
if (shift == 0) { |
504 |
result = val; |
505 |
cf = env->cc_src & CCF_C; |
506 |
} else if (shift < 32) { |
507 |
result = val >> shift; |
508 |
cf = (val >> (shift - 1)) & 1; |
509 |
} else if (shift == 32) { |
510 |
result = 0;
|
511 |
cf = val >> 31;
|
512 |
} else /* shift > 32 */ { |
513 |
result = 0;
|
514 |
cf = 0;
|
515 |
} |
516 |
env->cc_src = cf; |
517 |
env->cc_x = (cf != 0);
|
518 |
env->cc_dest = result; |
519 |
return result;
|
520 |
} |
521 |
|
522 |
uint32_t HELPER(sar_cc)(CPUState *env, uint32_t val, uint32_t shift) |
523 |
{ |
524 |
uint32_t result; |
525 |
uint32_t cf; |
526 |
|
527 |
shift &= 63;
|
528 |
if (shift == 0) { |
529 |
result = val; |
530 |
cf = (env->cc_src & CCF_C) != 0;
|
531 |
} else if (shift < 32) { |
532 |
result = (int32_t)val >> shift; |
533 |
cf = (val >> (shift - 1)) & 1; |
534 |
} else /* shift >= 32 */ { |
535 |
result = (int32_t)val >> 31;
|
536 |
cf = val >> 31;
|
537 |
} |
538 |
env->cc_src = cf; |
539 |
env->cc_x = cf; |
540 |
env->cc_dest = result; |
541 |
return result;
|
542 |
} |
543 |
|
544 |
/* FPU helpers. */
|
545 |
uint32_t HELPER(f64_to_i32)(CPUState *env, float64 val) |
546 |
{ |
547 |
return float64_to_int32(val, &env->fp_status);
|
548 |
} |
549 |
|
550 |
float32 HELPER(f64_to_f32)(CPUState *env, float64 val) |
551 |
{ |
552 |
return float64_to_float32(val, &env->fp_status);
|
553 |
} |
554 |
|
555 |
float64 HELPER(i32_to_f64)(CPUState *env, uint32_t val) |
556 |
{ |
557 |
return int32_to_float64(val, &env->fp_status);
|
558 |
} |
559 |
|
560 |
float64 HELPER(f32_to_f64)(CPUState *env, float32 val) |
561 |
{ |
562 |
return float32_to_float64(val, &env->fp_status);
|
563 |
} |
564 |
|
565 |
float64 HELPER(iround_f64)(CPUState *env, float64 val) |
566 |
{ |
567 |
return float64_round_to_int(val, &env->fp_status);
|
568 |
} |
569 |
|
570 |
float64 HELPER(itrunc_f64)(CPUState *env, float64 val) |
571 |
{ |
572 |
return float64_trunc_to_int(val, &env->fp_status);
|
573 |
} |
574 |
|
575 |
float64 HELPER(sqrt_f64)(CPUState *env, float64 val) |
576 |
{ |
577 |
return float64_sqrt(val, &env->fp_status);
|
578 |
} |
579 |
|
580 |
float64 HELPER(abs_f64)(float64 val) |
581 |
{ |
582 |
return float64_abs(val);
|
583 |
} |
584 |
|
585 |
float64 HELPER(chs_f64)(float64 val) |
586 |
{ |
587 |
return float64_chs(val);
|
588 |
} |
589 |
|
590 |
float64 HELPER(add_f64)(CPUState *env, float64 a, float64 b) |
591 |
{ |
592 |
return float64_add(a, b, &env->fp_status);
|
593 |
} |
594 |
|
595 |
float64 HELPER(sub_f64)(CPUState *env, float64 a, float64 b) |
596 |
{ |
597 |
return float64_sub(a, b, &env->fp_status);
|
598 |
} |
599 |
|
600 |
float64 HELPER(mul_f64)(CPUState *env, float64 a, float64 b) |
601 |
{ |
602 |
return float64_mul(a, b, &env->fp_status);
|
603 |
} |
604 |
|
605 |
float64 HELPER(div_f64)(CPUState *env, float64 a, float64 b) |
606 |
{ |
607 |
return float64_div(a, b, &env->fp_status);
|
608 |
} |
609 |
|
610 |
float64 HELPER(sub_cmp_f64)(CPUState *env, float64 a, float64 b) |
611 |
{ |
612 |
/* ??? This may incorrectly raise exceptions. */
|
613 |
/* ??? Should flush denormals to zero. */
|
614 |
float64 res; |
615 |
res = float64_sub(a, b, &env->fp_status); |
616 |
if (float64_is_nan(res)) {
|
617 |
/* +/-inf compares equal against itself, but sub returns nan. */
|
618 |
if (!float64_is_nan(a)
|
619 |
&& !float64_is_nan(b)) { |
620 |
res = float64_zero; |
621 |
if (float64_lt_quiet(a, res, &env->fp_status))
|
622 |
res = float64_chs(res); |
623 |
} |
624 |
} |
625 |
return res;
|
626 |
} |
627 |
|
628 |
uint32_t HELPER(compare_f64)(CPUState *env, float64 val) |
629 |
{ |
630 |
return float64_compare_quiet(val, float64_zero, &env->fp_status);
|
631 |
} |
632 |
|
633 |
/* MAC unit. */
|
634 |
/* FIXME: The MAC unit implementation is a bit of a mess. Some helpers
|
635 |
take values, others take register numbers and manipulate the contents
|
636 |
in-place. */
|
637 |
void HELPER(mac_move)(CPUState *env, uint32_t dest, uint32_t src)
|
638 |
{ |
639 |
uint32_t mask; |
640 |
env->macc[dest] = env->macc[src]; |
641 |
mask = MACSR_PAV0 << dest; |
642 |
if (env->macsr & (MACSR_PAV0 << src))
|
643 |
env->macsr |= mask; |
644 |
else
|
645 |
env->macsr &= ~mask; |
646 |
} |
647 |
|
648 |
uint64_t HELPER(macmuls)(CPUState *env, uint32_t op1, uint32_t op2) |
649 |
{ |
650 |
int64_t product; |
651 |
int64_t res; |
652 |
|
653 |
product = (uint64_t)op1 * op2; |
654 |
res = (product << 24) >> 24; |
655 |
if (res != product) {
|
656 |
env->macsr |= MACSR_V; |
657 |
if (env->macsr & MACSR_OMC) {
|
658 |
/* Make sure the accumulate operation overflows. */
|
659 |
if (product < 0) |
660 |
res = ~(1ll << 50); |
661 |
else
|
662 |
res = 1ll << 50; |
663 |
} |
664 |
} |
665 |
return res;
|
666 |
} |
667 |
|
668 |
uint64_t HELPER(macmulu)(CPUState *env, uint32_t op1, uint32_t op2) |
669 |
{ |
670 |
uint64_t product; |
671 |
|
672 |
product = (uint64_t)op1 * op2; |
673 |
if (product & (0xffffffull << 40)) { |
674 |
env->macsr |= MACSR_V; |
675 |
if (env->macsr & MACSR_OMC) {
|
676 |
/* Make sure the accumulate operation overflows. */
|
677 |
product = 1ll << 50; |
678 |
} else {
|
679 |
product &= ((1ull << 40) - 1); |
680 |
} |
681 |
} |
682 |
return product;
|
683 |
} |
684 |
|
685 |
uint64_t HELPER(macmulf)(CPUState *env, uint32_t op1, uint32_t op2) |
686 |
{ |
687 |
uint64_t product; |
688 |
uint32_t remainder; |
689 |
|
690 |
product = (uint64_t)op1 * op2; |
691 |
if (env->macsr & MACSR_RT) {
|
692 |
remainder = product & 0xffffff;
|
693 |
product >>= 24;
|
694 |
if (remainder > 0x800000) |
695 |
product++; |
696 |
else if (remainder == 0x800000) |
697 |
product += (product & 1);
|
698 |
} else {
|
699 |
product >>= 24;
|
700 |
} |
701 |
return product;
|
702 |
} |
703 |
|
704 |
void HELPER(macsats)(CPUState *env, uint32_t acc)
|
705 |
{ |
706 |
int64_t tmp; |
707 |
int64_t result; |
708 |
tmp = env->macc[acc]; |
709 |
result = ((tmp << 16) >> 16); |
710 |
if (result != tmp) {
|
711 |
env->macsr |= MACSR_V; |
712 |
} |
713 |
if (env->macsr & MACSR_V) {
|
714 |
env->macsr |= MACSR_PAV0 << acc; |
715 |
if (env->macsr & MACSR_OMC) {
|
716 |
/* The result is saturated to 32 bits, despite overflow occuring
|
717 |
at 48 bits. Seems weird, but that's what the hardware docs
|
718 |
say. */
|
719 |
result = (result >> 63) ^ 0x7fffffff; |
720 |
} |
721 |
} |
722 |
env->macc[acc] = result; |
723 |
} |
724 |
|
725 |
void HELPER(macsatu)(CPUState *env, uint32_t acc)
|
726 |
{ |
727 |
uint64_t val; |
728 |
|
729 |
val = env->macc[acc]; |
730 |
if (val & (0xffffull << 48)) { |
731 |
env->macsr |= MACSR_V; |
732 |
} |
733 |
if (env->macsr & MACSR_V) {
|
734 |
env->macsr |= MACSR_PAV0 << acc; |
735 |
if (env->macsr & MACSR_OMC) {
|
736 |
if (val > (1ull << 53)) |
737 |
val = 0;
|
738 |
else
|
739 |
val = (1ull << 48) - 1; |
740 |
} else {
|
741 |
val &= ((1ull << 48) - 1); |
742 |
} |
743 |
} |
744 |
env->macc[acc] = val; |
745 |
} |
746 |
|
747 |
void HELPER(macsatf)(CPUState *env, uint32_t acc)
|
748 |
{ |
749 |
int64_t sum; |
750 |
int64_t result; |
751 |
|
752 |
sum = env->macc[acc]; |
753 |
result = (sum << 16) >> 16; |
754 |
if (result != sum) {
|
755 |
env->macsr |= MACSR_V; |
756 |
} |
757 |
if (env->macsr & MACSR_V) {
|
758 |
env->macsr |= MACSR_PAV0 << acc; |
759 |
if (env->macsr & MACSR_OMC) {
|
760 |
result = (result >> 63) ^ 0x7fffffffffffll; |
761 |
} |
762 |
} |
763 |
env->macc[acc] = result; |
764 |
} |
765 |
|
766 |
void HELPER(mac_set_flags)(CPUState *env, uint32_t acc)
|
767 |
{ |
768 |
uint64_t val; |
769 |
val = env->macc[acc]; |
770 |
if (val == 0) |
771 |
env->macsr |= MACSR_Z; |
772 |
else if (val & (1ull << 47)); |
773 |
env->macsr |= MACSR_N; |
774 |
if (env->macsr & (MACSR_PAV0 << acc)) {
|
775 |
env->macsr |= MACSR_V; |
776 |
} |
777 |
if (env->macsr & MACSR_FI) {
|
778 |
val = ((int64_t)val) >> 40;
|
779 |
if (val != 0 && val != -1) |
780 |
env->macsr |= MACSR_EV; |
781 |
} else if (env->macsr & MACSR_SU) { |
782 |
val = ((int64_t)val) >> 32;
|
783 |
if (val != 0 && val != -1) |
784 |
env->macsr |= MACSR_EV; |
785 |
} else {
|
786 |
if ((val >> 32) != 0) |
787 |
env->macsr |= MACSR_EV; |
788 |
} |
789 |
} |
790 |
|
791 |
void HELPER(flush_flags)(CPUState *env, uint32_t cc_op)
|
792 |
{ |
793 |
cpu_m68k_flush_flags(env, cc_op); |
794 |
} |
795 |
|
796 |
uint32_t HELPER(get_macf)(CPUState *env, uint64_t val) |
797 |
{ |
798 |
int rem;
|
799 |
uint32_t result; |
800 |
|
801 |
if (env->macsr & MACSR_SU) {
|
802 |
/* 16-bit rounding. */
|
803 |
rem = val & 0xffffff;
|
804 |
val = (val >> 24) & 0xffffu; |
805 |
if (rem > 0x800000) |
806 |
val++; |
807 |
else if (rem == 0x800000) |
808 |
val += (val & 1);
|
809 |
} else if (env->macsr & MACSR_RT) { |
810 |
/* 32-bit rounding. */
|
811 |
rem = val & 0xff;
|
812 |
val >>= 8;
|
813 |
if (rem > 0x80) |
814 |
val++; |
815 |
else if (rem == 0x80) |
816 |
val += (val & 1);
|
817 |
} else {
|
818 |
/* No rounding. */
|
819 |
val >>= 8;
|
820 |
} |
821 |
if (env->macsr & MACSR_OMC) {
|
822 |
/* Saturate. */
|
823 |
if (env->macsr & MACSR_SU) {
|
824 |
if (val != (uint16_t) val) {
|
825 |
result = ((val >> 63) ^ 0x7fff) & 0xffff; |
826 |
} else {
|
827 |
result = val & 0xffff;
|
828 |
} |
829 |
} else {
|
830 |
if (val != (uint32_t)val) {
|
831 |
result = ((uint32_t)(val >> 63) & 0x7fffffff); |
832 |
} else {
|
833 |
result = (uint32_t)val; |
834 |
} |
835 |
} |
836 |
} else {
|
837 |
/* No saturation. */
|
838 |
if (env->macsr & MACSR_SU) {
|
839 |
result = val & 0xffff;
|
840 |
} else {
|
841 |
result = (uint32_t)val; |
842 |
} |
843 |
} |
844 |
return result;
|
845 |
} |
846 |
|
847 |
uint32_t HELPER(get_macs)(uint64_t val) |
848 |
{ |
849 |
if (val == (int32_t)val) {
|
850 |
return (int32_t)val;
|
851 |
} else {
|
852 |
return (val >> 61) ^ ~SIGNBIT; |
853 |
} |
854 |
} |
855 |
|
856 |
uint32_t HELPER(get_macu)(uint64_t val) |
857 |
{ |
858 |
if ((val >> 32) == 0) { |
859 |
return (uint32_t)val;
|
860 |
} else {
|
861 |
return 0xffffffffu; |
862 |
} |
863 |
} |
864 |
|
865 |
uint32_t HELPER(get_mac_extf)(CPUState *env, uint32_t acc) |
866 |
{ |
867 |
uint32_t val; |
868 |
val = env->macc[acc] & 0x00ff;
|
869 |
val = (env->macc[acc] >> 32) & 0xff00; |
870 |
val |= (env->macc[acc + 1] << 16) & 0x00ff0000; |
871 |
val |= (env->macc[acc + 1] >> 16) & 0xff000000; |
872 |
return val;
|
873 |
} |
874 |
|
875 |
uint32_t HELPER(get_mac_exti)(CPUState *env, uint32_t acc) |
876 |
{ |
877 |
uint32_t val; |
878 |
val = (env->macc[acc] >> 32) & 0xffff; |
879 |
val |= (env->macc[acc + 1] >> 16) & 0xffff0000; |
880 |
return val;
|
881 |
} |
882 |
|
883 |
void HELPER(set_mac_extf)(CPUState *env, uint32_t val, uint32_t acc)
|
884 |
{ |
885 |
int64_t res; |
886 |
int32_t tmp; |
887 |
res = env->macc[acc] & 0xffffffff00ull;
|
888 |
tmp = (int16_t)(val & 0xff00);
|
889 |
res |= ((int64_t)tmp) << 32;
|
890 |
res |= val & 0xff;
|
891 |
env->macc[acc] = res; |
892 |
res = env->macc[acc + 1] & 0xffffffff00ull; |
893 |
tmp = (val & 0xff000000);
|
894 |
res |= ((int64_t)tmp) << 16;
|
895 |
res |= (val >> 16) & 0xff; |
896 |
env->macc[acc + 1] = res;
|
897 |
} |
898 |
|
899 |
void HELPER(set_mac_exts)(CPUState *env, uint32_t val, uint32_t acc)
|
900 |
{ |
901 |
int64_t res; |
902 |
int32_t tmp; |
903 |
res = (uint32_t)env->macc[acc]; |
904 |
tmp = (int16_t)val; |
905 |
res |= ((int64_t)tmp) << 32;
|
906 |
env->macc[acc] = res; |
907 |
res = (uint32_t)env->macc[acc + 1];
|
908 |
tmp = val & 0xffff0000;
|
909 |
res |= (int64_t)tmp << 16;
|
910 |
env->macc[acc + 1] = res;
|
911 |
} |
912 |
|
913 |
void HELPER(set_mac_extu)(CPUState *env, uint32_t val, uint32_t acc)
|
914 |
{ |
915 |
uint64_t res; |
916 |
res = (uint32_t)env->macc[acc]; |
917 |
res |= ((uint64_t)(val & 0xffff)) << 32; |
918 |
env->macc[acc] = res; |
919 |
res = (uint32_t)env->macc[acc + 1];
|
920 |
res |= (uint64_t)(val & 0xffff0000) << 16; |
921 |
env->macc[acc + 1] = res;
|
922 |
} |