1 /* 2 * m68k virtual CPU header 3 * 4 * Copyright (c) 2005-2007 CodeSourcery 5 * Written by Paul Brook 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #ifndef M68K_CPU_H 22 #define M68K_CPU_H 23 24 #define TARGET_LONG_BITS 32 25 26 #define CPUArchState struct CPUM68KState 27 28 #include "qemu-common.h" 29 #include "exec/cpu-defs.h" 30 #include "cpu-qom.h" 31 #include "fpu/softfloat.h" 32 33 #define OS_BYTE 0 34 #define OS_WORD 1 35 #define OS_LONG 2 36 #define OS_SINGLE 3 37 #define OS_DOUBLE 4 38 #define OS_EXTENDED 5 39 #define OS_PACKED 6 40 41 #define MAX_QREGS 32 42 43 #define EXCP_ACCESS 2 /* Access (MMU) error. */ 44 #define EXCP_ADDRESS 3 /* Address error. */ 45 #define EXCP_ILLEGAL 4 /* Illegal instruction. */ 46 #define EXCP_DIV0 5 /* Divide by zero */ 47 #define EXCP_PRIVILEGE 8 /* Privilege violation. */ 48 #define EXCP_TRACE 9 49 #define EXCP_LINEA 10 /* Unimplemented line-A (MAC) opcode. */ 50 #define EXCP_LINEF 11 /* Unimplemented line-F (FPU) opcode. */ 51 #define EXCP_DEBUGNBP 12 /* Non-breakpoint debug interrupt. */ 52 #define EXCP_DEBEGBP 13 /* Breakpoint debug interrupt. */ 53 #define EXCP_FORMAT 14 /* RTE format error. */ 54 #define EXCP_UNINITIALIZED 15 55 #define EXCP_TRAP0 32 /* User trap #0. */ 56 #define EXCP_TRAP15 47 /* User trap #15. */ 57 #define EXCP_UNSUPPORTED 61 58 #define EXCP_ICE 13 59 60 #define EXCP_RTE 0x100 61 #define EXCP_HALT_INSN 0x101 62 63 #define NB_MMU_MODES 2 64 #define TARGET_INSN_START_EXTRA_WORDS 1 65 66 typedef struct CPUM68KState { 67 uint32_t dregs[8]; 68 uint32_t aregs[8]; 69 uint32_t pc; 70 uint32_t sr; 71 72 /* SSP and USP. The current_sp is stored in aregs[7], the other here. */ 73 int current_sp; 74 uint32_t sp[2]; 75 76 /* Condition flags. */ 77 uint32_t cc_op; 78 uint32_t cc_x; /* always 0/1 */ 79 uint32_t cc_n; /* in bit 31 (i.e. negative) */ 80 uint32_t cc_v; /* in bit 31, unused, or computed from cc_n and cc_v */ 81 uint32_t cc_c; /* either 0/1, unused, or computed from cc_n and cc_v */ 82 uint32_t cc_z; /* == 0 or unused */ 83 84 float64 fregs[8]; 85 float64 fp_result; 86 uint32_t fpcr; 87 uint32_t fpsr; 88 float_status fp_status; 89 90 uint64_t mactmp; 91 /* EMAC Hardware deals with 48-bit values composed of one 32-bit and 92 two 8-bit parts. We store a single 64-bit value and 93 rearrange/extend this when changing modes. */ 94 uint64_t macc[4]; 95 uint32_t macsr; 96 uint32_t mac_mask; 97 98 /* Temporary storage for DIV helpers. */ 99 uint32_t div1; 100 uint32_t div2; 101 102 /* MMU status. */ 103 struct { 104 uint32_t ar; 105 } mmu; 106 107 /* Control registers. */ 108 uint32_t vbr; 109 uint32_t mbar; 110 uint32_t rambar0; 111 uint32_t cacr; 112 113 int pending_vector; 114 int pending_level; 115 116 uint32_t qregs[MAX_QREGS]; 117 118 CPU_COMMON 119 120 /* Fields from here on are preserved across CPU reset. */ 121 uint32_t features; 122 } CPUM68KState; 123 124 /** 125 * M68kCPU: 126 * @env: #CPUM68KState 127 * 128 * A Motorola 68k CPU. 129 */ 130 struct M68kCPU { 131 /*< private >*/ 132 CPUState parent_obj; 133 /*< public >*/ 134 135 CPUM68KState env; 136 }; 137 138 static inline M68kCPU *m68k_env_get_cpu(CPUM68KState *env) 139 { 140 return container_of(env, M68kCPU, env); 141 } 142 143 #define ENV_GET_CPU(e) CPU(m68k_env_get_cpu(e)) 144 145 #define ENV_OFFSET offsetof(M68kCPU, env) 146 147 void m68k_cpu_do_interrupt(CPUState *cpu); 148 bool m68k_cpu_exec_interrupt(CPUState *cpu, int int_req); 149 void m68k_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf, 150 int flags); 151 hwaddr m68k_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); 152 int m68k_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg); 153 int m68k_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); 154 155 void m68k_tcg_init(void); 156 void m68k_cpu_init_gdb(M68kCPU *cpu); 157 M68kCPU *cpu_m68k_init(const char *cpu_model); 158 /* you can call this signal handler from your SIGBUS and SIGSEGV 159 signal handlers to inform the virtual CPU of exceptions. non zero 160 is returned if the signal was handled by the virtual CPU. */ 161 int cpu_m68k_signal_handler(int host_signum, void *pinfo, 162 void *puc); 163 uint32_t cpu_m68k_get_ccr(CPUM68KState *env); 164 void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t); 165 166 167 /* Instead of computing the condition codes after each m68k instruction, 168 * QEMU just stores one operand (called CC_SRC), the result 169 * (called CC_DEST) and the type of operation (called CC_OP). When the 170 * condition codes are needed, the condition codes can be calculated 171 * using this information. Condition codes are not generated if they 172 * are only needed for conditional branches. 173 */ 174 typedef enum { 175 /* Translator only -- use env->cc_op. */ 176 CC_OP_DYNAMIC = -1, 177 178 /* Each flag bit computed into cc_[xcnvz]. */ 179 CC_OP_FLAGS, 180 181 /* X in cc_x, C = X, N in cc_n, Z in cc_n, V via cc_n/cc_v. */ 182 CC_OP_ADDB, CC_OP_ADDW, CC_OP_ADDL, 183 CC_OP_SUBB, CC_OP_SUBW, CC_OP_SUBL, 184 185 /* X in cc_x, {N,Z,C,V} via cc_n/cc_v. */ 186 CC_OP_CMPB, CC_OP_CMPW, CC_OP_CMPL, 187 188 /* X in cc_x, C = 0, V = 0, N in cc_n, Z in cc_n. */ 189 CC_OP_LOGIC, 190 191 CC_OP_NB 192 } CCOp; 193 194 #define CCF_C 0x01 195 #define CCF_V 0x02 196 #define CCF_Z 0x04 197 #define CCF_N 0x08 198 #define CCF_X 0x10 199 200 #define SR_I_SHIFT 8 201 #define SR_I 0x0700 202 #define SR_M 0x1000 203 #define SR_S 0x2000 204 #define SR_T 0x8000 205 206 #define M68K_SSP 0 207 #define M68K_USP 1 208 209 /* CACR fields are implementation defined, but some bits are common. */ 210 #define M68K_CACR_EUSP 0x10 211 212 #define MACSR_PAV0 0x100 213 #define MACSR_OMC 0x080 214 #define MACSR_SU 0x040 215 #define MACSR_FI 0x020 216 #define MACSR_RT 0x010 217 #define MACSR_N 0x008 218 #define MACSR_Z 0x004 219 #define MACSR_V 0x002 220 #define MACSR_EV 0x001 221 222 void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector); 223 void m68k_switch_sp(CPUM68KState *env); 224 225 #define M68K_FPCR_PREC (1 << 6) 226 227 void do_m68k_semihosting(CPUM68KState *env, int nr); 228 229 /* There are 4 ColdFire core ISA revisions: A, A+, B and C. 230 Each feature covers the subset of instructions common to the 231 ISA revisions mentioned. */ 232 233 enum m68k_features { 234 M68K_FEATURE_M68000, 235 M68K_FEATURE_CF_ISA_A, 236 M68K_FEATURE_CF_ISA_B, /* (ISA B or C). */ 237 M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C). */ 238 M68K_FEATURE_BRAL, /* Long unconditional branch. (ISA A+ or B). */ 239 M68K_FEATURE_CF_FPU, 240 M68K_FEATURE_CF_MAC, 241 M68K_FEATURE_CF_EMAC, 242 M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate). */ 243 M68K_FEATURE_USP, /* User Stack Pointer. (ISA A+, B or C). */ 244 M68K_FEATURE_EXT_FULL, /* 68020+ full extension word. */ 245 M68K_FEATURE_WORD_INDEX, /* word sized address index registers. */ 246 M68K_FEATURE_SCALED_INDEX, /* scaled address index registers. */ 247 M68K_FEATURE_LONG_MULDIV, /* 32 bit multiply/divide. */ 248 M68K_FEATURE_QUAD_MULDIV, /* 64 bit multiply/divide. */ 249 M68K_FEATURE_BCCL, /* Long conditional branches. */ 250 M68K_FEATURE_BITFIELD, /* Bit field insns. */ 251 M68K_FEATURE_FPU, 252 M68K_FEATURE_CAS, 253 M68K_FEATURE_BKPT, 254 }; 255 256 static inline int m68k_feature(CPUM68KState *env, int feature) 257 { 258 return (env->features & (1u << feature)) != 0; 259 } 260 261 void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf); 262 263 void register_m68k_insns (CPUM68KState *env); 264 265 #ifdef CONFIG_USER_ONLY 266 /* Coldfire Linux uses 8k pages 267 * and m68k linux uses 4k pages 268 * use the smaller one 269 */ 270 #define TARGET_PAGE_BITS 12 271 #else 272 /* Smallest TLB entry size is 1k. */ 273 #define TARGET_PAGE_BITS 10 274 #endif 275 276 #define TARGET_PHYS_ADDR_SPACE_BITS 32 277 #define TARGET_VIRT_ADDR_SPACE_BITS 32 278 279 #define cpu_init(cpu_model) CPU(cpu_m68k_init(cpu_model)) 280 281 #define cpu_signal_handler cpu_m68k_signal_handler 282 #define cpu_list m68k_cpu_list 283 284 /* MMU modes definitions */ 285 #define MMU_MODE0_SUFFIX _kernel 286 #define MMU_MODE1_SUFFIX _user 287 #define MMU_USER_IDX 1 288 static inline int cpu_mmu_index (CPUM68KState *env, bool ifetch) 289 { 290 return (env->sr & SR_S) == 0 ? 1 : 0; 291 } 292 293 int m68k_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw, 294 int mmu_idx); 295 296 #include "exec/cpu-all.h" 297 298 static inline void cpu_get_tb_cpu_state(CPUM68KState *env, target_ulong *pc, 299 target_ulong *cs_base, uint32_t *flags) 300 { 301 *pc = env->pc; 302 *cs_base = 0; 303 *flags = (env->fpcr & M68K_FPCR_PREC) /* Bit 6 */ 304 | (env->sr & SR_S) /* Bit 13 */ 305 | ((env->macsr >> 4) & 0xf); /* Bits 0-3 */ 306 } 307 308 #endif 309