1 /* 2 * CRIS virtual CPU header 3 * 4 * Copyright (c) 2007 AXIS Communications AB 5 * Written by Edgar E. Iglesias 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 CRIS_CPU_H 22 #define CRIS_CPU_H 23 24 #include "cpu-qom.h" 25 #include "exec/cpu-defs.h" 26 27 #define EXCP_NMI 1 28 #define EXCP_GURU 2 29 #define EXCP_BUSFAULT 3 30 #define EXCP_IRQ 4 31 #define EXCP_BREAK 5 32 33 /* CRIS-specific interrupt pending bits. */ 34 #define CPU_INTERRUPT_NMI CPU_INTERRUPT_TGT_EXT_3 35 36 /* CRUS CPU device objects interrupt lines. */ 37 /* PIC passes the vector for the IRQ as the value of it sends over qemu_irq */ 38 #define CRIS_CPU_IRQ 0 39 #define CRIS_CPU_NMI 1 40 41 /* Register aliases. R0 - R15 */ 42 #define R_FP 8 43 #define R_SP 14 44 #define R_ACR 15 45 46 /* Support regs, P0 - P15 */ 47 #define PR_BZ 0 48 #define PR_VR 1 49 #define PR_PID 2 50 #define PR_SRS 3 51 #define PR_WZ 4 52 #define PR_EXS 5 53 #define PR_EDA 6 54 #define PR_PREFIX 6 /* On CRISv10 P6 is reserved, we use it as prefix. */ 55 #define PR_MOF 7 56 #define PR_DZ 8 57 #define PR_EBP 9 58 #define PR_ERP 10 59 #define PR_SRP 11 60 #define PR_NRP 12 61 #define PR_CCS 13 62 #define PR_USP 14 63 #define PRV10_BRP 14 64 #define PR_SPC 15 65 66 /* CPU flags. */ 67 #define Q_FLAG 0x80000000 68 #define M_FLAG_V32 0x40000000 69 #define PFIX_FLAG 0x800 /* CRISv10 Only. */ 70 #define F_FLAG_V10 0x400 71 #define P_FLAG_V10 0x200 72 #define S_FLAG 0x200 73 #define R_FLAG 0x100 74 #define P_FLAG 0x80 75 #define M_FLAG_V10 0x80 76 #define U_FLAG 0x40 77 #define I_FLAG 0x20 78 #define X_FLAG 0x10 79 #define N_FLAG 0x08 80 #define Z_FLAG 0x04 81 #define V_FLAG 0x02 82 #define C_FLAG 0x01 83 #define ALU_FLAGS 0x1F 84 85 /* Condition codes. */ 86 #define CC_CC 0 87 #define CC_CS 1 88 #define CC_NE 2 89 #define CC_EQ 3 90 #define CC_VC 4 91 #define CC_VS 5 92 #define CC_PL 6 93 #define CC_MI 7 94 #define CC_LS 8 95 #define CC_HI 9 96 #define CC_GE 10 97 #define CC_LT 11 98 #define CC_GT 12 99 #define CC_LE 13 100 #define CC_A 14 101 #define CC_P 15 102 103 typedef struct { 104 uint32_t hi; 105 uint32_t lo; 106 } TLBSet; 107 108 typedef struct CPUCRISState { 109 uint32_t regs[16]; 110 /* P0 - P15 are referred to as special registers in the docs. */ 111 uint32_t pregs[16]; 112 113 /* Pseudo register for the PC. Not directly accessible on CRIS. */ 114 uint32_t pc; 115 116 /* Pseudo register for the kernel stack. */ 117 uint32_t ksp; 118 119 /* Branch. */ 120 int dslot; 121 int btaken; 122 uint32_t btarget; 123 124 /* Condition flag tracking. */ 125 uint32_t cc_op; 126 uint32_t cc_mask; 127 uint32_t cc_dest; 128 uint32_t cc_src; 129 uint32_t cc_result; 130 /* size of the operation, 1 = byte, 2 = word, 4 = dword. */ 131 int cc_size; 132 /* X flag at the time of cc snapshot. */ 133 int cc_x; 134 135 /* CRIS has certain insns that lockout interrupts. */ 136 int locked_irq; 137 int interrupt_vector; 138 int fault_vector; 139 int trap_vector; 140 141 /* FIXME: add a check in the translator to avoid writing to support 142 register sets beyond the 4th. The ISA allows up to 256! but in 143 practice there is no core that implements more than 4. 144 145 Support function registers are used to control units close to the 146 core. Accesses do not pass down the normal hierarchy. 147 */ 148 uint32_t sregs[4][16]; 149 150 /* Linear feedback shift reg in the mmu. Used to provide pseudo 151 randomness for the 'hint' the mmu gives to sw for choosing valid 152 sets on TLB refills. */ 153 uint32_t mmu_rand_lfsr; 154 155 /* 156 * We just store the stores to the tlbset here for later evaluation 157 * when the hw needs access to them. 158 * 159 * One for I and another for D. 160 */ 161 TLBSet tlbsets[2][4][16]; 162 163 /* Fields up to this point are cleared by a CPU reset */ 164 struct {} end_reset_fields; 165 166 /* Members from load_info on are preserved across resets. */ 167 void *load_info; 168 } CPUCRISState; 169 170 /** 171 * CRISCPU: 172 * @env: #CPUCRISState 173 * 174 * A CRIS CPU. 175 */ 176 struct CRISCPU { 177 /*< private >*/ 178 CPUState parent_obj; 179 /*< public >*/ 180 181 CPUNegativeOffsetState neg; 182 CPUCRISState env; 183 }; 184 185 186 #ifndef CONFIG_USER_ONLY 187 extern const VMStateDescription vmstate_cris_cpu; 188 #endif 189 190 void cris_cpu_do_interrupt(CPUState *cpu); 191 void crisv10_cpu_do_interrupt(CPUState *cpu); 192 bool cris_cpu_exec_interrupt(CPUState *cpu, int int_req); 193 194 void cris_cpu_dump_state(CPUState *cs, FILE *f, int flags); 195 196 hwaddr cris_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); 197 198 int crisv10_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); 199 int cris_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); 200 int cris_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); 201 202 /* you can call this signal handler from your SIGBUS and SIGSEGV 203 signal handlers to inform the virtual CPU of exceptions. non zero 204 is returned if the signal was handled by the virtual CPU. */ 205 int cpu_cris_signal_handler(int host_signum, void *pinfo, 206 void *puc); 207 208 void cris_initialize_tcg(void); 209 void cris_initialize_crisv10_tcg(void); 210 211 /* Instead of computing the condition codes after each CRIS instruction, 212 * QEMU just stores one operand (called CC_SRC), the result 213 * (called CC_DEST) and the type of operation (called CC_OP). When the 214 * condition codes are needed, the condition codes can be calculated 215 * using this information. Condition codes are not generated if they 216 * are only needed for conditional branches. 217 */ 218 enum { 219 CC_OP_DYNAMIC, /* Use env->cc_op */ 220 CC_OP_FLAGS, 221 CC_OP_CMP, 222 CC_OP_MOVE, 223 CC_OP_ADD, 224 CC_OP_ADDC, 225 CC_OP_MCP, 226 CC_OP_ADDU, 227 CC_OP_SUB, 228 CC_OP_SUBU, 229 CC_OP_NEG, 230 CC_OP_BTST, 231 CC_OP_MULS, 232 CC_OP_MULU, 233 CC_OP_DSTEP, 234 CC_OP_MSTEP, 235 CC_OP_BOUND, 236 237 CC_OP_OR, 238 CC_OP_AND, 239 CC_OP_XOR, 240 CC_OP_LSL, 241 CC_OP_LSR, 242 CC_OP_ASR, 243 CC_OP_LZ 244 }; 245 246 /* CRIS uses 8k pages. */ 247 #define MMAP_SHIFT TARGET_PAGE_BITS 248 249 #define CRIS_CPU_TYPE_SUFFIX "-" TYPE_CRIS_CPU 250 #define CRIS_CPU_TYPE_NAME(name) (name CRIS_CPU_TYPE_SUFFIX) 251 #define CPU_RESOLVING_TYPE TYPE_CRIS_CPU 252 253 #define cpu_signal_handler cpu_cris_signal_handler 254 255 /* MMU modes definitions */ 256 #define MMU_USER_IDX 1 257 static inline int cpu_mmu_index (CPUCRISState *env, bool ifetch) 258 { 259 return !!(env->pregs[PR_CCS] & U_FLAG); 260 } 261 262 bool cris_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 263 MMUAccessType access_type, int mmu_idx, 264 bool probe, uintptr_t retaddr); 265 266 /* Support function regs. */ 267 #define SFR_RW_GC_CFG 0][0 268 #define SFR_RW_MM_CFG env->pregs[PR_SRS]][0 269 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1 270 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2 271 #define SFR_R_MM_CAUSE env->pregs[PR_SRS]][3 272 #define SFR_RW_MM_TLB_SEL env->pregs[PR_SRS]][4 273 #define SFR_RW_MM_TLB_LO env->pregs[PR_SRS]][5 274 #define SFR_RW_MM_TLB_HI env->pregs[PR_SRS]][6 275 276 typedef CPUCRISState CPUArchState; 277 typedef CRISCPU ArchCPU; 278 279 #include "exec/cpu-all.h" 280 281 static inline void cpu_get_tb_cpu_state(CPUCRISState *env, target_ulong *pc, 282 target_ulong *cs_base, uint32_t *flags) 283 { 284 *pc = env->pc; 285 *cs_base = 0; 286 *flags = env->dslot | 287 (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG 288 | X_FLAG | PFIX_FLAG)); 289 } 290 291 #define cpu_list cris_cpu_list 292 void cris_cpu_list(void); 293 294 #endif 295