target-sh4/cpu.h

   1 /*
   2  *  SH4 emulation
   3  *
   4  *  Copyright (c) 2005 Samuel Tardieu
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  19  */
  20 #ifndef _CPU_SH4_H
  21 #define _CPU_SH4_H
  22
  23 #include "config.h"
  24
  25 #define TARGET_LONG_BITS 32
  26 #define TARGET_HAS_ICE 1
  27
  28 #define ELF_MACHINE     EM_SH
  29
  30 /* CPU Subtypes */
  31 #define SH_CPU_SH7750  (1 << 0)
  32 #define SH_CPU_SH7750S (1 << 1)
  33 #define SH_CPU_SH7750R (1 << 2)
  34 #define SH_CPU_SH7751  (1 << 3)
  35 #define SH_CPU_SH7751R (1 << 4)
  36 #define SH_CPU_SH7785  (1 << 5)
  37 #define SH_CPU_SH7750_ALL (SH_CPU_SH7750 | SH_CPU_SH7750S | SH_CPU_SH7750R)
  38 #define SH_CPU_SH7751_ALL (SH_CPU_SH7751 | SH_CPU_SH7751R)
  39
  40 #include "cpu-defs.h"
  41
  42 #include "softfloat.h"
  43
  44 #define TARGET_PAGE_BITS 12     /* 4k XXXXX */
  45
  46 #define SR_MD (1 << 30)
  47 #define SR_RB (1 << 29)
  48 #define SR_BL (1 << 28)
  49 #define SR_FD (1 << 15)
  50 #define SR_M  (1 << 9)
  51 #define SR_Q  (1 << 8)
  52 #define SR_I3 (1 << 7)
  53 #define SR_I2 (1 << 6)
  54 #define SR_I1 (1 << 5)
  55 #define SR_I0 (1 << 4)
  56 #define SR_S  (1 << 1)
  57 #define SR_T  (1 << 0)
  58
  59 #define FPSCR_FR (1 << 21)
  60 #define FPSCR_SZ (1 << 20)
  61 #define FPSCR_PR (1 << 19)
  62 #define FPSCR_DN (1 << 18)
  63 #define DELAY_SLOT             (1 << 0)
  64 #define DELAY_SLOT_CONDITIONAL (1 << 1)
  65 #define DELAY_SLOT_TRUE        (1 << 2)
  66 #define DELAY_SLOT_CLEARME     (1 << 3)
  67 /* The dynamic value of the DELAY_SLOT_TRUE flag determines whether the jump
  68  * after the delay slot should be taken or not. It is calculated from SR_T.
  69  *
  70  * It is unclear if it is permitted to modify the SR_T flag in a delay slot.
  71  * The use of DELAY_SLOT_TRUE flag makes us accept such SR_T modification.
  72  */
  73
  74 /* XXXXX The structure could be made more compact */
  75 typedef struct tlb_t {
  76     uint8_t asid;               /* address space identifier */
  77     uint32_t vpn;               /* virtual page number */
  78     uint8_t v;                  /* validity */
  79     uint32_t ppn;               /* physical page number */
  80     uint8_t sz;                 /* page size */
  81     uint32_t size;              /* cached page size in bytes */
  82     uint8_t sh;                 /* share status */
  83     uint8_t c;                  /* cacheability */
  84     uint8_t pr;                 /* protection key */
  85     uint8_t d;                  /* dirty */
  86     uint8_t wt;                 /* write through */
  87     uint8_t sa;                 /* space attribute (PCMCIA) */
  88     uint8_t tc;                 /* timing control */
  89 } tlb_t;
  90
  91 #define UTLB_SIZE 64
  92 #define ITLB_SIZE 4
  93
  94 #define NB_MMU_MODES 2
  95
  96 enum sh_features {
  97     SH_FEATURE_SH4A = 1,
  98     SH_FEATURE_BCR3_AND_BCR4 = 2,
  99 };
 100
 101 typedef struct CPUSH4State {
 102     int id;                     /* CPU model */
 103
 104     uint32_t flags;             /* general execution flags */
 105     uint32_t gregs[24];         /* general registers */
 106     float32 fregs[32];          /* floating point registers */
 107     uint32_t sr;                /* status register */
 108     uint32_t ssr;               /* saved status register */
 109     uint32_t spc;               /* saved program counter */
 110     uint32_t gbr;               /* global base register */
 111     uint32_t vbr;               /* vector base register */
 112     uint32_t sgr;               /* saved global register 15 */
 113     uint32_t dbr;               /* debug base register */
 114     uint32_t pc;                /* program counter */
 115     uint32_t delayed_pc;        /* target of delayed jump */
 116     uint32_t mach;              /* multiply and accumulate high */
 117     uint32_t macl;              /* multiply and accumulate low */
 118     uint32_t pr;                /* procedure register */
 119     uint32_t fpscr;             /* floating point status/control register */
 120     uint32_t fpul;              /* floating point communication register */
 121
 122     /* float point status register */
 123     float_status fp_status;
 124
 125     /* The features that we should emulate. See sh_features above.  */
 126     uint32_t features;
 127
 128     /* Those belong to the specific unit (SH7750) but are handled here */
 129     uint32_t mmucr;             /* MMU control register */
 130     uint32_t pteh;              /* page table entry high register */
 131     uint32_t ptel;              /* page table entry low register */
 132     uint32_t ptea;              /* page table entry assistance register */
 133     uint32_t ttb;               /* tranlation table base register */
 134     uint32_t tea;               /* TLB exception address register */
 135     uint32_t tra;               /* TRAPA exception register */
 136     uint32_t expevt;            /* exception event register */
 137     uint32_t intevt;            /* interrupt event register */
 138
 139     uint32_t pvr;               /* Processor Version Register */
 140     uint32_t prr;               /* Processor Revision Register */
 141     uint32_t cvr;               /* Cache Version Register */
 142
 143     uint32_t ldst;
 144
 145      CPU_COMMON tlb_t utlb[UTLB_SIZE];  /* unified translation table */
 146     tlb_t itlb[ITLB_SIZE];      /* instruction translation table */
 147     void *intc_handle;
 148     int intr_at_halt;           /* SR_BL ignored during sleep */
 149 } CPUSH4State;
 150
 151 CPUSH4State *cpu_sh4_init(const char *cpu_model);
 152 int cpu_sh4_exec(CPUSH4State * s);
 153 int cpu_sh4_signal_handler(int host_signum, void *pinfo,
 154                            void *puc);
 155 int cpu_sh4_handle_mmu_fault(CPUSH4State * env, target_ulong address, int rw,
 156                              int mmu_idx, int is_softmmu);
 157 void do_interrupt(CPUSH4State * env);
 158
 159 void sh4_cpu_list(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
 160 void cpu_sh4_write_mmaped_utlb_addr(CPUSH4State *s, target_phys_addr_t addr,
 161                                     uint32_t mem_value);
 162
 163 static inline void cpu_set_tls(CPUSH4State *env, target_ulong newtls)
 164 {
 165   env->gbr = newtls;
 166 }
 167
 168 #include "softfloat.h"
 169
 170 #define CPUState CPUSH4State
 171 #define cpu_init cpu_sh4_init
 172 #define cpu_exec cpu_sh4_exec
 173 #define cpu_gen_code cpu_sh4_gen_code
 174 #define cpu_signal_handler cpu_sh4_signal_handler
 175 #define cpu_list sh4_cpu_list
 176
 177 /* MMU modes definitions */
 178 #define MMU_MODE0_SUFFIX _kernel
 179 #define MMU_MODE1_SUFFIX _user
 180 #define MMU_USER_IDX 1
 181 static inline int cpu_mmu_index (CPUState *env)
 182 {
 183     return (env->sr & SR_MD) == 0 ? 1 : 0;
 184 }
 185
 186 #if defined(CONFIG_USER_ONLY)
 187 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 188 {
 189     if (newsp)
 190         env->gregs[15] = newsp;
 191     env->gregs[0] = 0;
 192 }
 193 #endif
 194
 195 #include "cpu-all.h"
 196 #include "exec-all.h"
 197
 198 /* Memory access type */
 199 enum {
 200     /* Privilege */
 201     ACCESS_PRIV = 0x01,
 202     /* Direction */
 203     ACCESS_WRITE = 0x02,
 204     /* Type of instruction */
 205     ACCESS_CODE = 0x10,
 206     ACCESS_INT = 0x20
 207 };
 208
 209 /* MMU control register */
 210 #define MMUCR    0x1F000010
 211 #define MMUCR_AT (1<<0)
 212 #define MMUCR_SV (1<<8)
 213 #define MMUCR_URC_BITS (6)
 214 #define MMUCR_URC_OFFSET (10)
 215 #define MMUCR_URC_SIZE (1 << MMUCR_URC_BITS)
 216 #define MMUCR_URC_MASK (((MMUCR_URC_SIZE) - 1) << MMUCR_URC_OFFSET)
 217 static inline int cpu_mmucr_urc (uint32_t mmucr)
 218 {
 219     return ((mmucr & MMUCR_URC_MASK) >> MMUCR_URC_OFFSET);
 220 }
 221
 222 /* PTEH : Page Translation Entry High register */
 223 #define PTEH_ASID_BITS (8)
 224 #define PTEH_ASID_SIZE (1 << PTEH_ASID_BITS)
 225 #define PTEH_ASID_MASK (PTEH_ASID_SIZE - 1)
 226 #define cpu_pteh_asid(pteh) ((pteh) & PTEH_ASID_MASK)
 227 #define PTEH_VPN_BITS (22)
 228 #define PTEH_VPN_OFFSET (10)
 229 #define PTEH_VPN_SIZE (1 << PTEH_VPN_BITS)
 230 #define PTEH_VPN_MASK (((PTEH_VPN_SIZE) - 1) << PTEH_VPN_OFFSET)
 231 static inline int cpu_pteh_vpn (uint32_t pteh)
 232 {
 233     return ((pteh & PTEH_VPN_MASK) >> PTEH_VPN_OFFSET);
 234 }
 235
 236 /* PTEL : Page Translation Entry Low register */
 237 #define PTEL_V        (1 << 8)
 238 #define cpu_ptel_v(ptel) (((ptel) & PTEL_V) >> 8)
 239 #define PTEL_C        (1 << 3)
 240 #define cpu_ptel_c(ptel) (((ptel) & PTEL_C) >> 3)
 241 #define PTEL_D        (1 << 2)
 242 #define cpu_ptel_d(ptel) (((ptel) & PTEL_D) >> 2)
 243 #define PTEL_SH       (1 << 1)
 244 #define cpu_ptel_sh(ptel)(((ptel) & PTEL_SH) >> 1)
 245 #define PTEL_WT       (1 << 0)
 246 #define cpu_ptel_wt(ptel) ((ptel) & PTEL_WT)
 247
 248 #define PTEL_SZ_HIGH_OFFSET  (7)
 249 #define PTEL_SZ_HIGH  (1 << PTEL_SZ_HIGH_OFFSET)
 250 #define PTEL_SZ_LOW_OFFSET   (4)
 251 #define PTEL_SZ_LOW   (1 << PTEL_SZ_LOW_OFFSET)
 252 static inline int cpu_ptel_sz (uint32_t ptel)
 253 {
 254     int sz;
 255     sz = (ptel & PTEL_SZ_HIGH) >> PTEL_SZ_HIGH_OFFSET;
 256     sz <<= 1;
 257     sz |= (ptel & PTEL_SZ_LOW) >> PTEL_SZ_LOW_OFFSET;
 258     return sz;
 259 }
 260
 261 #define PTEL_PPN_BITS (19)
 262 #define PTEL_PPN_OFFSET (10)
 263 #define PTEL_PPN_SIZE (1 << PTEL_PPN_BITS)
 264 #define PTEL_PPN_MASK (((PTEL_PPN_SIZE) - 1) << PTEL_PPN_OFFSET)
 265 static inline int cpu_ptel_ppn (uint32_t ptel)
 266 {
 267     return ((ptel & PTEL_PPN_MASK) >> PTEL_PPN_OFFSET);
 268 }
 269
 270 #define PTEL_PR_BITS   (2)
 271 #define PTEL_PR_OFFSET (5)
 272 #define PTEL_PR_SIZE (1 << PTEL_PR_BITS)
 273 #define PTEL_PR_MASK (((PTEL_PR_SIZE) - 1) << PTEL_PR_OFFSET)
 274 static inline int cpu_ptel_pr (uint32_t ptel)
 275 {
 276     return ((ptel & PTEL_PR_MASK) >> PTEL_PR_OFFSET);
 277 }
 278
 279 /* PTEA : Page Translation Entry Assistance register */
 280 #define PTEA_SA_BITS (3)
 281 #define PTEA_SA_SIZE (1 << PTEA_SA_BITS)
 282 #define PTEA_SA_MASK (PTEA_SA_SIZE - 1)
 283 #define cpu_ptea_sa(ptea) ((ptea) & PTEA_SA_MASK)
 284 #define PTEA_TC        (1 << 3)
 285 #define cpu_ptea_tc(ptea) (((ptea) & PTEA_TC) >> 3)
 286
 287 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 288 {
 289     env->pc = tb->pc;
 290     env->flags = tb->flags;
 291 }
 292
 293 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 294                                         target_ulong *cs_base, int *flags)
 295 {
 296     *pc = env->pc;
 297     *cs_base = 0;
 298     *flags = (env->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL
 299                     | DELAY_SLOT_TRUE | DELAY_SLOT_CLEARME))   /* Bits  0- 3 */
 300             | (env->fpscr & (FPSCR_FR | FPSCR_SZ | FPSCR_PR))  /* Bits 19-21 */
 301             | (env->sr & (SR_MD | SR_RB))                      /* Bits 29-30 */
 302             | (env->sr & SR_FD);                               /* Bit 15 */
 303 }
 304
 305 #endif                          /* _CPU_SH4_H */