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