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, see <http://www.gnu.org/licenses/>.
  19  */
  20 #ifndef CPU_M68K_H
  21 #define CPU_M68K_H
  22
  23 #define TARGET_LONG_BITS 32
  24
  25 #define CPUState struct CPUM68KState
  26
  27 #include "cpu-defs.h"
  28
  29 #include "softfloat.h"
  30
  31 #define MAX_QREGS 32
  32
  33 #define TARGET_HAS_ICE 1
  34
  35 #define ELF_MACHINE     EM_68K
  36
  37 #define EXCP_ACCESS         2   /* Access (MMU) error.  */
  38 #define EXCP_ADDRESS        3   /* Address error.  */
  39 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
  40 #define EXCP_DIV0           5   /* Divide by zero */
  41 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
  42 #define EXCP_TRACE          9
  43 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
  44 #define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
  45 #define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
  46 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
  47 #define EXCP_FORMAT         14  /* RTE format error.  */
  48 #define EXCP_UNINITIALIZED  15
  49 #define EXCP_TRAP0          32   /* User trap #0.  */
  50 #define EXCP_TRAP15         47   /* User trap #15.  */
  51 #define EXCP_UNSUPPORTED    61
  52 #define EXCP_ICE            13
  53
  54 #define EXCP_RTE            0x100
  55 #define EXCP_HALT_INSN      0x101
  56
  57 #define NB_MMU_MODES 2
  58
  59 typedef struct CPUM68KState {
  60     uint32_t dregs[8];
  61     uint32_t aregs[8];
  62     uint32_t pc;
  63     uint32_t sr;
  64
  65     /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
  66     int current_sp;
  67     uint32_t sp[2];
  68
  69     /* Condition flags.  */
  70     uint32_t cc_op;
  71     uint32_t cc_dest;
  72     uint32_t cc_src;
  73     uint32_t cc_x;
  74
  75     float64 fregs[8];
  76     float64 fp_result;
  77     uint32_t fpcr;
  78     uint32_t fpsr;
  79     float_status fp_status;
  80
  81     uint64_t mactmp;
  82     /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
  83        two 8-bit parts.  We store a single 64-bit value and
  84        rearrange/extend this when changing modes.  */
  85     uint64_t macc[4];
  86     uint32_t macsr;
  87     uint32_t mac_mask;
  88
  89     /* Temporary storage for DIV helpers.  */
  90     uint32_t div1;
  91     uint32_t div2;
  92
  93     /* MMU status.  */
  94     struct {
  95         uint32_t ar;
  96     } mmu;
  97
  98     /* Control registers.  */
  99     uint32_t vbr;
 100     uint32_t mbar;
 101     uint32_t rambar0;
 102     uint32_t cacr;
 103
 104     /* ??? remove this.  */
 105     uint32_t t1;
 106
 107     int pending_vector;
 108     int pending_level;
 109
 110     uint32_t qregs[MAX_QREGS];
 111
 112     CPU_COMMON
 113
 114     uint32_t features;
 115 } CPUM68KState;
 116
 117 void m68k_tcg_init(void);
 118 CPUM68KState *cpu_m68k_init(const char *cpu_model);
 119 int cpu_m68k_exec(CPUM68KState *s);
 120 void cpu_m68k_close(CPUM68KState *s);
 121 void do_interrupt(int is_hw);
 122 /* you can call this signal handler from your SIGBUS and SIGSEGV
 123    signal handlers to inform the virtual CPU of exceptions. non zero
 124    is returned if the signal was handled by the virtual CPU.  */
 125 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 126                            void *puc);
 127 void cpu_m68k_flush_flags(CPUM68KState *, int);
 128
 129 enum {
 130     CC_OP_DYNAMIC, /* Use env->cc_op  */
 131     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 132     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 133     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 134     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 135     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 136     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 137     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 138     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 139     CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
 140 };
 141
 142 #define CCF_C 0x01
 143 #define CCF_V 0x02
 144 #define CCF_Z 0x04
 145 #define CCF_N 0x08
 146 #define CCF_X 0x10
 147
 148 #define SR_I_SHIFT 8
 149 #define SR_I  0x0700
 150 #define SR_M  0x1000
 151 #define SR_S  0x2000
 152 #define SR_T  0x8000
 153
 154 #define M68K_SSP    0
 155 #define M68K_USP    1
 156
 157 /* CACR fields are implementation defined, but some bits are common.  */
 158 #define M68K_CACR_EUSP  0x10
 159
 160 #define MACSR_PAV0  0x100
 161 #define MACSR_OMC   0x080
 162 #define MACSR_SU    0x040
 163 #define MACSR_FI    0x020
 164 #define MACSR_RT    0x010
 165 #define MACSR_N     0x008
 166 #define MACSR_Z     0x004
 167 #define MACSR_V     0x002
 168 #define MACSR_EV    0x001
 169
 170 void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
 171 void m68k_set_macsr(CPUM68KState *env, uint32_t val);
 172 void m68k_switch_sp(CPUM68KState *env);
 173
 174 #define M68K_FPCR_PREC (1 << 6)
 175
 176 void do_m68k_semihosting(CPUM68KState *env, int nr);
 177
 178 /* There are 4 ColdFire core ISA revisions: A, A+, B and C.
 179    Each feature covers the subset of instructions common to the
 180    ISA revisions mentioned.  */
 181
 182 enum m68k_features {
 183     M68K_FEATURE_CF_ISA_A,
 184     M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
 185     M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
 186     M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
 187     M68K_FEATURE_CF_FPU,
 188     M68K_FEATURE_CF_MAC,
 189     M68K_FEATURE_CF_EMAC,
 190     M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
 191     M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
 192     M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
 193     M68K_FEATURE_WORD_INDEX /* word sized address index registers.  */
 194 };
 195
 196 static inline int m68k_feature(CPUM68KState *env, int feature)
 197 {
 198     return (env->features & (1u << feature)) != 0;
 199 }
 200
 201 void m68k_cpu_list(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
 202
 203 void register_m68k_insns (CPUM68KState *env);
 204
 205 #ifdef CONFIG_USER_ONLY
 206 /* Linux uses 8k pages.  */
 207 #define TARGET_PAGE_BITS 13
 208 #else
 209 /* Smallest TLB entry size is 1k.  */
 210 #define TARGET_PAGE_BITS 10
 211 #endif
 212
 213 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 214 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 215
 216 #define cpu_init cpu_m68k_init
 217 #define cpu_exec cpu_m68k_exec
 218 #define cpu_gen_code cpu_m68k_gen_code
 219 #define cpu_signal_handler cpu_m68k_signal_handler
 220 #define cpu_list m68k_cpu_list
 221
 222 /* MMU modes definitions */
 223 #define MMU_MODE0_SUFFIX _kernel
 224 #define MMU_MODE1_SUFFIX _user
 225 #define MMU_USER_IDX 1
 226 static inline int cpu_mmu_index (CPUState *env)
 227 {
 228     return (env->sr & SR_S) == 0 ? 1 : 0;
 229 }
 230
 231 int cpu_m68k_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
 232                               int mmu_idx, int is_softmmu);
 233 #define cpu_handle_mmu_fault cpu_m68k_handle_mmu_fault
 234
 235 #if defined(CONFIG_USER_ONLY)
 236 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 237 {
 238     if (newsp)
 239         env->aregs[7] = newsp;
 240     env->dregs[0] = 0;
 241 }
 242 #endif
 243
 244 #include "cpu-all.h"
 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->fpcr & M68K_FPCR_PREC)       /* Bit  6 */
 252             | (env->sr & SR_S)                  /* Bit  13 */
 253             | ((env->macsr >> 4) & 0xf);        /* Bits 0-3 */
 254 }
 255
 256 #endif