target-m68k/cpu.h

   1 /*
   2  * m68k virtual CPU header
   3  *
   4  *  Copyright (c) 2005-2007 CodeSourcery
   5  *  Written by Paul Brook
   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_M68K_H
  22 #define CPU_M68K_H
  23
  24 #define TARGET_LONG_BITS 32
  25
  26 #include "cpu-defs.h"
  27
  28 #include "softfloat.h"
  29
  30 #define MAX_QREGS 32
  31
  32 #define TARGET_HAS_ICE 1
  33
  34 #define ELF_MACHINE     EM_68K
  35
  36 #define EXCP_ACCESS         2   /* Access (MMU) error.  */
  37 #define EXCP_ADDRESS        3   /* Address error.  */
  38 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
  39 #define EXCP_DIV0           5   /* Divide by zero */
  40 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
  41 #define EXCP_TRACE          9
  42 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
  43 #define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
  44 #define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
  45 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
  46 #define EXCP_FORMAT         14  /* RTE format error.  */
  47 #define EXCP_UNINITIALIZED  15
  48 #define EXCP_TRAP0          32   /* User trap #0.  */
  49 #define EXCP_TRAP15         47   /* User trap #15.  */
  50 #define EXCP_UNSUPPORTED    61
  51 #define EXCP_ICE            13
  52
  53 #define EXCP_RTE            0x100
  54 #define EXCP_HALT_INSN      0x101
  55
  56 #define NB_MMU_MODES 2
  57
  58 typedef struct CPUM68KState {
  59     uint32_t dregs[8];
  60     uint32_t aregs[8];
  61     uint32_t pc;
  62     uint32_t sr;
  63
  64     /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
  65     int current_sp;
  66     uint32_t sp[2];
  67
  68     /* Condition flags.  */
  69     uint32_t cc_op;
  70     uint32_t cc_dest;
  71     uint32_t cc_src;
  72     uint32_t cc_x;
  73
  74     float64 fregs[8];
  75     float64 fp_result;
  76     uint32_t fpcr;
  77     uint32_t fpsr;
  78     float_status fp_status;
  79
  80     uint64_t mactmp;
  81     /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
  82        two 8-bit parts.  We store a single 64-bit value and
  83        rearrange/extend this when changing modes.  */
  84     uint64_t macc[4];
  85     uint32_t macsr;
  86     uint32_t mac_mask;
  87
  88     /* Temporary storage for DIV helpers.  */
  89     uint32_t div1;
  90     uint32_t div2;
  91
  92     /* MMU status.  */
  93     struct {
  94         uint32_t ar;
  95     } mmu;
  96
  97     /* Control registers.  */
  98     uint32_t vbr;
  99     uint32_t mbar;
 100     uint32_t rambar0;
 101     uint32_t cacr;
 102
 103     /* ??? remove this.  */
 104     uint32_t t1;
 105
 106     int pending_vector;
 107     int pending_level;
 108
 109     uint32_t qregs[MAX_QREGS];
 110
 111     CPU_COMMON
 112
 113     uint32_t features;
 114 } CPUM68KState;
 115
 116 void m68k_tcg_init(void);
 117 CPUM68KState *cpu_m68k_init(const char *cpu_model);
 118 int cpu_m68k_exec(CPUM68KState *s);
 119 void cpu_m68k_close(CPUM68KState *s);
 120 void do_interrupt(int is_hw);
 121 /* you can call this signal handler from your SIGBUS and SIGSEGV
 122    signal handlers to inform the virtual CPU of exceptions. non zero
 123    is returned if the signal was handled by the virtual CPU.  */
 124 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 125                            void *puc);
 126 void cpu_m68k_flush_flags(CPUM68KState *, int);
 127
 128 enum {
 129     CC_OP_DYNAMIC, /* Use env->cc_op  */
 130     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 131     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 132     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 133     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 134     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 135     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 136     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 137     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 138     CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
 139 };
 140
 141 #define CCF_C 0x01
 142 #define CCF_V 0x02
 143 #define CCF_Z 0x04
 144 #define CCF_N 0x08
 145 #define CCF_X 0x10
 146
 147 #define SR_I_SHIFT 8
 148 #define SR_I  0x0700
 149 #define SR_M  0x1000
 150 #define SR_S  0x2000
 151 #define SR_T  0x8000
 152
 153 #define M68K_SSP    0
 154 #define M68K_USP    1
 155
 156 /* CACR fields are implementation defined, but some bits are common.  */
 157 #define M68K_CACR_EUSP  0x10
 158
 159 #define MACSR_PAV0  0x100
 160 #define MACSR_OMC   0x080
 161 #define MACSR_SU    0x040
 162 #define MACSR_FI    0x020
 163 #define MACSR_RT    0x010
 164 #define MACSR_N     0x008
 165 #define MACSR_Z     0x004
 166 #define MACSR_V     0x002
 167 #define MACSR_EV    0x001
 168
 169 void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
 170 void m68k_set_macsr(CPUM68KState *env, uint32_t val);
 171 void m68k_switch_sp(CPUM68KState *env);
 172
 173 #define M68K_FPCR_PREC (1 << 6)
 174
 175 void do_m68k_semihosting(CPUM68KState *env, int nr);
 176
 177 /* There are 4 ColdFire core ISA revisions: A, A+, B and C.
 178    Each feature covers the subset of instructions common to the
 179    ISA revisions mentioned.  */
 180
 181 enum m68k_features {
 182     M68K_FEATURE_CF_ISA_A,
 183     M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
 184     M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
 185     M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
 186     M68K_FEATURE_CF_FPU,
 187     M68K_FEATURE_CF_MAC,
 188     M68K_FEATURE_CF_EMAC,
 189     M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
 190     M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
 191     M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
 192     M68K_FEATURE_WORD_INDEX /* word sized address index registers.  */
 193 };
 194
 195 static inline int m68k_feature(CPUM68KState *env, int feature)
 196 {
 197     return (env->features & (1u << feature)) != 0;
 198 }
 199
 200 void register_m68k_insns (CPUM68KState *env);
 201
 202 #ifdef CONFIG_USER_ONLY
 203 /* Linux uses 8k pages.  */
 204 #define TARGET_PAGE_BITS 13
 205 #else
 206 /* Smallest TLB entry size is 1k.  */
 207 #define TARGET_PAGE_BITS 10
 208 #endif
 209
 210 #define CPUState CPUM68KState
 211 #define cpu_init cpu_m68k_init
 212 #define cpu_exec cpu_m68k_exec
 213 #define cpu_gen_code cpu_m68k_gen_code
 214 #define cpu_signal_handler cpu_m68k_signal_handler
 215
 216 /* MMU modes definitions */
 217 #define MMU_MODE0_SUFFIX _kernel
 218 #define MMU_MODE1_SUFFIX _user
 219 #define MMU_USER_IDX 1
 220 static inline int cpu_mmu_index (CPUState *env)
 221 {
 222     return (env->sr & SR_S) == 0 ? 1 : 0;
 223 }
 224
 225 #if defined(CONFIG_USER_ONLY)
 226 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 227 {
 228     if (newsp)
 229         env->aregs[7] = newsp;
 230     env->dregs[0] = 0;
 231 }
 232 #endif
 233
 234 #include "cpu-all.h"
 235 #include "exec-all.h"
 236
 237 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 238 {
 239     env->pc = tb->pc;
 240 }
 241
 242 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 243                                         target_ulong *cs_base, int *flags)
 244 {
 245     *pc = env->pc;
 246     *cs_base = 0;
 247     *flags = (env->fpcr & M68K_FPCR_PREC)       /* Bit  6 */
 248             | (env->sr & SR_S)                  /* Bit  13 */
 249             | ((env->macsr >> 4) & 0xf);        /* Bits 0-3 */
 250 }
 251
 252 #endif