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 CPUArchState struct CPUM68KState
  26
  27 #include "qemu-common.h"
  28 #include "exec/cpu-defs.h"
  29
  30 #include "fpu/softfloat.h"
  31
  32 #define MAX_QREGS 32
  33
  34 #define EXCP_ACCESS         2   /* Access (MMU) error.  */
  35 #define EXCP_ADDRESS        3   /* Address error.  */
  36 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
  37 #define EXCP_DIV0           5   /* Divide by zero */
  38 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
  39 #define EXCP_TRACE          9
  40 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
  41 #define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
  42 #define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
  43 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
  44 #define EXCP_FORMAT         14  /* RTE format error.  */
  45 #define EXCP_UNINITIALIZED  15
  46 #define EXCP_TRAP0          32   /* User trap #0.  */
  47 #define EXCP_TRAP15         47   /* User trap #15.  */
  48 #define EXCP_UNSUPPORTED    61
  49 #define EXCP_ICE            13
  50
  51 #define EXCP_RTE            0x100
  52 #define EXCP_HALT_INSN      0x101
  53
  54 #define NB_MMU_MODES 2
  55
  56 typedef struct CPUM68KState {
  57     uint32_t dregs[8];
  58     uint32_t aregs[8];
  59     uint32_t pc;
  60     uint32_t sr;
  61
  62     /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
  63     int current_sp;
  64     uint32_t sp[2];
  65
  66     /* Condition flags.  */
  67     uint32_t cc_op;
  68     uint32_t cc_dest;
  69     uint32_t cc_src;
  70     uint32_t cc_x;
  71
  72     float64 fregs[8];
  73     float64 fp_result;
  74     uint32_t fpcr;
  75     uint32_t fpsr;
  76     float_status fp_status;
  77
  78     uint64_t mactmp;
  79     /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
  80        two 8-bit parts.  We store a single 64-bit value and
  81        rearrange/extend this when changing modes.  */
  82     uint64_t macc[4];
  83     uint32_t macsr;
  84     uint32_t mac_mask;
  85
  86     /* Temporary storage for DIV helpers.  */
  87     uint32_t div1;
  88     uint32_t div2;
  89
  90     /* MMU status.  */
  91     struct {
  92         uint32_t ar;
  93     } mmu;
  94
  95     /* Control registers.  */
  96     uint32_t vbr;
  97     uint32_t mbar;
  98     uint32_t rambar0;
  99     uint32_t cacr;
 100
 101     int pending_vector;
 102     int pending_level;
 103
 104     uint32_t qregs[MAX_QREGS];
 105
 106     CPU_COMMON
 107
 108     /* Fields from here on are preserved across CPU reset. */
 109     uint32_t features;
 110 } CPUM68KState;
 111
 112 #include "cpu-qom.h"
 113
 114 void m68k_tcg_init(void);
 115 void m68k_cpu_init_gdb(M68kCPU *cpu);
 116 M68kCPU *cpu_m68k_init(const char *cpu_model);
 117 int cpu_m68k_exec(CPUState *cpu);
 118 /* you can call this signal handler from your SIGBUS and SIGSEGV
 119    signal handlers to inform the virtual CPU of exceptions. non zero
 120    is returned if the signal was handled by the virtual CPU.  */
 121 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 122                            void *puc);
 123 void cpu_m68k_flush_flags(CPUM68KState *, int);
 124
 125 enum {
 126     CC_OP_DYNAMIC, /* Use env->cc_op  */
 127     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 128     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 129     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 130     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 131     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 132     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 133     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 134     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 135     CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
 136 };
 137
 138 #define CCF_C 0x01
 139 #define CCF_V 0x02
 140 #define CCF_Z 0x04
 141 #define CCF_N 0x08
 142 #define CCF_X 0x10
 143
 144 #define SR_I_SHIFT 8
 145 #define SR_I  0x0700
 146 #define SR_M  0x1000
 147 #define SR_S  0x2000
 148 #define SR_T  0x8000
 149
 150 #define M68K_SSP    0
 151 #define M68K_USP    1
 152
 153 /* CACR fields are implementation defined, but some bits are common.  */
 154 #define M68K_CACR_EUSP  0x10
 155
 156 #define MACSR_PAV0  0x100
 157 #define MACSR_OMC   0x080
 158 #define MACSR_SU    0x040
 159 #define MACSR_FI    0x020
 160 #define MACSR_RT    0x010
 161 #define MACSR_N     0x008
 162 #define MACSR_Z     0x004
 163 #define MACSR_V     0x002
 164 #define MACSR_EV    0x001
 165
 166 void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector);
 167 void m68k_set_macsr(CPUM68KState *env, uint32_t val);
 168 void m68k_switch_sp(CPUM68KState *env);
 169
 170 #define M68K_FPCR_PREC (1 << 6)
 171
 172 void do_m68k_semihosting(CPUM68KState *env, int nr);
 173
 174 /* There are 4 ColdFire core ISA revisions: A, A+, B and C.
 175    Each feature covers the subset of instructions common to the
 176    ISA revisions mentioned.  */
 177
 178 enum m68k_features {
 179     M68K_FEATURE_CF_ISA_A,
 180     M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
 181     M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
 182     M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
 183     M68K_FEATURE_CF_FPU,
 184     M68K_FEATURE_CF_MAC,
 185     M68K_FEATURE_CF_EMAC,
 186     M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
 187     M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
 188     M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
 189     M68K_FEATURE_WORD_INDEX /* word sized address index registers.  */
 190 };
 191
 192 static inline int m68k_feature(CPUM68KState *env, int feature)
 193 {
 194     return (env->features & (1u << feature)) != 0;
 195 }
 196
 197 void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 198
 199 void register_m68k_insns (CPUM68KState *env);
 200
 201 #ifdef CONFIG_USER_ONLY
 202 /* Linux uses 8k pages.  */
 203 #define TARGET_PAGE_BITS 13
 204 #else
 205 /* Smallest TLB entry size is 1k.  */
 206 #define TARGET_PAGE_BITS 10
 207 #endif
 208
 209 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 210 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 211
 212 #define cpu_init(cpu_model) CPU(cpu_m68k_init(cpu_model))
 213
 214 #define cpu_exec cpu_m68k_exec
 215 #define cpu_signal_handler cpu_m68k_signal_handler
 216 #define cpu_list m68k_cpu_list
 217
 218 /* MMU modes definitions */
 219 #define MMU_MODE0_SUFFIX _kernel
 220 #define MMU_MODE1_SUFFIX _user
 221 #define MMU_USER_IDX 1
 222 static inline int cpu_mmu_index (CPUM68KState *env, bool ifetch)
 223 {
 224     return (env->sr & SR_S) == 0 ? 1 : 0;
 225 }
 226
 227 int m68k_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
 228                               int mmu_idx);
 229
 230 #include "exec/cpu-all.h"
 231
 232 static inline void cpu_get_tb_cpu_state(CPUM68KState *env, target_ulong *pc,
 233                                         target_ulong *cs_base, uint32_t *flags)
 234 {
 235     *pc = env->pc;
 236     *cs_base = 0;
 237     *flags = (env->fpcr & M68K_FPCR_PREC)       /* Bit  6 */
 238             | (env->sr & SR_S)                  /* Bit  13 */
 239             | ((env->macsr >> 4) & 0xf);        /* Bits 0-3 */
 240 }
 241
 242 #include "exec/exec-all.h"
 243
 244 #endif