target-cris/cpu.h

   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, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  20  */
  21 #ifndef CPU_CRIS_H
  22 #define CPU_CRIS_H
  23
  24 #define TARGET_LONG_BITS 32
  25
  26 #define CPUState struct CPUCRISState
  27
  28 #include "cpu-defs.h"
  29
  30 #define TARGET_HAS_ICE 1
  31
  32 #define ELF_MACHINE     EM_CRIS
  33
  34 #define EXCP_NMI        1
  35 #define EXCP_GURU       2
  36 #define EXCP_BUSFAULT   3
  37 #define EXCP_IRQ        4
  38 #define EXCP_BREAK      5
  39
  40 /* Register aliases. R0 - R15 */
  41 #define R_FP  8
  42 #define R_SP  14
  43 #define R_ACR 15
  44
  45 /* Support regs, P0 - P15  */
  46 #define PR_BZ  0
  47 #define PR_VR  1
  48 #define PR_PID 2
  49 #define PR_SRS 3
  50 #define PR_WZ  4
  51 #define PR_EXS 5
  52 #define PR_EDA 6
  53 #define PR_MOF 7
  54 #define PR_DZ  8
  55 #define PR_EBP 9
  56 #define PR_ERP 10
  57 #define PR_SRP 11
  58 #define PR_NRP 12
  59 #define PR_CCS 13
  60 #define PR_USP 14
  61 #define PR_SPC 15
  62
  63 /* CPU flags.  */
  64 #define Q_FLAG 0x80000000
  65 #define M_FLAG 0x40000000
  66 #define S_FLAG 0x200
  67 #define R_FLAG 0x100
  68 #define P_FLAG 0x80
  69 #define U_FLAG 0x40
  70 #define P_FLAG 0x80
  71 #define U_FLAG 0x40
  72 #define I_FLAG 0x20
  73 #define X_FLAG 0x10
  74 #define N_FLAG 0x08
  75 #define Z_FLAG 0x04
  76 #define V_FLAG 0x02
  77 #define C_FLAG 0x01
  78 #define ALU_FLAGS 0x1F
  79
  80 /* Condition codes.  */
  81 #define CC_CC   0
  82 #define CC_CS   1
  83 #define CC_NE   2
  84 #define CC_EQ   3
  85 #define CC_VC   4
  86 #define CC_VS   5
  87 #define CC_PL   6
  88 #define CC_MI   7
  89 #define CC_LS   8
  90 #define CC_HI   9
  91 #define CC_GE  10
  92 #define CC_LT  11
  93 #define CC_GT  12
  94 #define CC_LE  13
  95 #define CC_A   14
  96 #define CC_P   15
  97
  98 /* Internal flags for the implementation.  */
  99 #define F_DELAYSLOT 1
 100
 101 #define NB_MMU_MODES 2
 102
 103 typedef struct CPUCRISState {
 104         uint32_t regs[16];
 105         /* P0 - P15 are referred to as special registers in the docs.  */
 106         uint32_t pregs[16];
 107
 108         /* Pseudo register for the PC. Not directly accessable on CRIS.  */
 109         uint32_t pc;
 110
 111         /* Pseudo register for the kernel stack.  */
 112         uint32_t ksp;
 113
 114         /* Branch.  */
 115         int dslot;
 116         int btaken;
 117         uint32_t btarget;
 118
 119         /* Condition flag tracking.  */
 120         uint32_t cc_op;
 121         uint32_t cc_mask;
 122         uint32_t cc_dest;
 123         uint32_t cc_src;
 124         uint32_t cc_result;
 125         /* size of the operation, 1 = byte, 2 = word, 4 = dword.  */
 126         int cc_size;
 127         /* X flag at the time of cc snapshot.  */
 128         int cc_x;
 129
 130         int interrupt_vector;
 131         int fault_vector;
 132         int trap_vector;
 133
 134         /* FIXME: add a check in the translator to avoid writing to support
 135            register sets beyond the 4th. The ISA allows up to 256! but in
 136            practice there is no core that implements more than 4.
 137
 138            Support function registers are used to control units close to the
 139            core. Accesses do not pass down the normal hierarchy.
 140         */
 141         uint32_t sregs[4][16];
 142
 143         /* Linear feedback shift reg in the mmu. Used to provide pseudo
 144            randomness for the 'hint' the mmu gives to sw for chosing valid
 145            sets on TLB refills.  */
 146         uint32_t mmu_rand_lfsr;
 147
 148         /*
 149          * We just store the stores to the tlbset here for later evaluation
 150          * when the hw needs access to them.
 151          *
 152          * One for I and another for D.
 153          */
 154         struct
 155         {
 156                 uint32_t hi;
 157                 uint32_t lo;
 158         } tlbsets[2][4][16];
 159
 160         CPU_COMMON
 161 } CPUCRISState;
 162
 163 CPUCRISState *cpu_cris_init(const char *cpu_model);
 164 int cpu_cris_exec(CPUCRISState *s);
 165 void cpu_cris_close(CPUCRISState *s);
 166 void do_interrupt(CPUCRISState *env);
 167 /* you can call this signal handler from your SIGBUS and SIGSEGV
 168    signal handlers to inform the virtual CPU of exceptions. non zero
 169    is returned if the signal was handled by the virtual CPU.  */
 170 int cpu_cris_signal_handler(int host_signum, void *pinfo,
 171                            void *puc);
 172
 173 enum {
 174     CC_OP_DYNAMIC, /* Use env->cc_op  */
 175     CC_OP_FLAGS,
 176     CC_OP_CMP,
 177     CC_OP_MOVE,
 178     CC_OP_ADD,
 179     CC_OP_ADDC,
 180     CC_OP_MCP,
 181     CC_OP_ADDU,
 182     CC_OP_SUB,
 183     CC_OP_SUBU,
 184     CC_OP_NEG,
 185     CC_OP_BTST,
 186     CC_OP_MULS,
 187     CC_OP_MULU,
 188     CC_OP_DSTEP,
 189     CC_OP_BOUND,
 190
 191     CC_OP_OR,
 192     CC_OP_AND,
 193     CC_OP_XOR,
 194     CC_OP_LSL,
 195     CC_OP_LSR,
 196     CC_OP_ASR,
 197     CC_OP_LZ
 198 };
 199
 200 /* CRIS uses 8k pages.  */
 201 #define TARGET_PAGE_BITS 13
 202 #define MMAP_SHIFT TARGET_PAGE_BITS
 203
 204 #define cpu_init cpu_cris_init
 205 #define cpu_exec cpu_cris_exec
 206 #define cpu_gen_code cpu_cris_gen_code
 207 #define cpu_signal_handler cpu_cris_signal_handler
 208
 209 #define CPU_SAVE_VERSION 1
 210
 211 /* MMU modes definitions */
 212 #define MMU_MODE0_SUFFIX _kernel
 213 #define MMU_MODE1_SUFFIX _user
 214 #define MMU_USER_IDX 1
 215 static inline int cpu_mmu_index (CPUState *env)
 216 {
 217         return !!(env->pregs[PR_CCS] & U_FLAG);
 218 }
 219
 220 int cpu_cris_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
 221                               int mmu_idx, int is_softmmu);
 222
 223 #if defined(CONFIG_USER_ONLY)
 224 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 225 {
 226     if (newsp)
 227         env->regs[14] = newsp;
 228     env->regs[10] = 0;
 229 }
 230 #endif
 231
 232 static inline void cpu_set_tls(CPUCRISState *env, target_ulong newtls)
 233 {
 234         env->pregs[PR_PID] = (env->pregs[PR_PID] & 0xff) | newtls;
 235 }
 236
 237 /* Support function regs.  */
 238 #define SFR_RW_GC_CFG      0][0
 239 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0
 240 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
 241 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
 242 #define SFR_R_MM_CAUSE     env->pregs[PR_SRS]][3
 243 #define SFR_RW_MM_TLB_SEL  env->pregs[PR_SRS]][4
 244 #define SFR_RW_MM_TLB_LO   env->pregs[PR_SRS]][5
 245 #define SFR_RW_MM_TLB_HI   env->pregs[PR_SRS]][6
 246
 247 #include "cpu-all.h"
 248 #include "exec-all.h"
 249
 250 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 251 {
 252     env->pc = tb->pc;
 253 }
 254
 255 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 256                                         target_ulong *cs_base, int *flags)
 257 {
 258     *pc = env->pc;
 259     *cs_base = 0;
 260     *flags = env->dslot |
 261             (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG | X_FLAG));
 262 }
 263
 264 #endif