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