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 "qemu-common.h"
  28 #include "cpu-defs.h"
  29
  30 #include "softfloat.h"
  31
  32 #define MAX_QREGS 32
  33
  34 #define TARGET_HAS_ICE 1
  35
  36 #define ELF_MACHINE     EM_68K
  37
  38 #define EXCP_ACCESS         2   /* Access (MMU) error.  */
  39 #define EXCP_ADDRESS        3   /* Address error.  */
  40 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
  41 #define EXCP_DIV0           5   /* Divide by zero */
  42 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
  43 #define EXCP_TRACE          9
  44 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
  45 #define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
  46 #define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
  47 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
  48 #define EXCP_FORMAT         14  /* RTE format error.  */
  49 #define EXCP_UNINITIALIZED  15
  50 #define EXCP_TRAP0          32   /* User trap #0.  */
  51 #define EXCP_TRAP15         47   /* User trap #15.  */
  52 #define EXCP_UNSUPPORTED    61
  53 #define EXCP_ICE            13
  54
  55 #define EXCP_RTE            0x100
  56 #define EXCP_HALT_INSN      0x101
  57
  58 #define NB_MMU_MODES 2
  59
  60 typedef struct CPUM68KState {
  61     uint32_t dregs[8];
  62     uint32_t aregs[8];
  63     uint32_t pc;
  64     uint32_t sr;
  65
  66     /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
  67     int current_sp;
  68     uint32_t sp[2];
  69
  70     /* Condition flags.  */
  71     uint32_t cc_op;
  72     uint32_t cc_dest;
  73     uint32_t cc_src;
  74     uint32_t cc_x;
  75
  76     float64 fregs[8];
  77     float64 fp_result;
  78     uint32_t fpcr;
  79     uint32_t fpsr;
  80     float_status fp_status;
  81
  82     uint64_t mactmp;
  83     /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
  84        two 8-bit parts.  We store a single 64-bit value and
  85        rearrange/extend this when changing modes.  */
  86     uint64_t macc[4];
  87     uint32_t macsr;
  88     uint32_t mac_mask;
  89
  90     /* Temporary storage for DIV helpers.  */
  91     uint32_t div1;
  92     uint32_t div2;
  93
  94     /* MMU status.  */
  95     struct {
  96         uint32_t ar;
  97     } mmu;
  98
  99     /* Control registers.  */
 100     uint32_t vbr;
 101     uint32_t mbar;
 102     uint32_t rambar0;
 103     uint32_t cacr;
 104
 105     /* ??? remove this.  */
 106     uint32_t t1;
 107
 108     int pending_vector;
 109     int pending_level;
 110
 111     uint32_t qregs[MAX_QREGS];
 112
 113     CPU_COMMON
 114
 115     uint32_t features;
 116 } CPUM68KState;
 117
 118 void m68k_tcg_init(void);
 119 CPUM68KState *cpu_m68k_init(const char *cpu_model);
 120 int cpu_m68k_exec(CPUM68KState *s);
 121 void cpu_m68k_close(CPUM68KState *s);
 122 void do_interrupt(int is_hw);
 123 /* you can call this signal handler from your SIGBUS and SIGSEGV
 124    signal handlers to inform the virtual CPU of exceptions. non zero
 125    is returned if the signal was handled by the virtual CPU.  */
 126 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 127                            void *puc);
 128 void cpu_m68k_flush_flags(CPUM68KState *, int);
 129
 130 enum {
 131     CC_OP_DYNAMIC, /* Use env->cc_op  */
 132     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 133     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 134     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 135     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 136     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 137     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 138     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 139     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 140     CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
 141 };
 142
 143 #define CCF_C 0x01
 144 #define CCF_V 0x02
 145 #define CCF_Z 0x04
 146 #define CCF_N 0x08
 147 #define CCF_X 0x10
 148
 149 #define SR_I_SHIFT 8
 150 #define SR_I  0x0700
 151 #define SR_M  0x1000
 152 #define SR_S  0x2000
 153 #define SR_T  0x8000
 154
 155 #define M68K_SSP    0
 156 #define M68K_USP    1
 157
 158 /* CACR fields are implementation defined, but some bits are common.  */
 159 #define M68K_CACR_EUSP  0x10
 160
 161 #define MACSR_PAV0  0x100
 162 #define MACSR_OMC   0x080
 163 #define MACSR_SU    0x040
 164 #define MACSR_FI    0x020
 165 #define MACSR_RT    0x010
 166 #define MACSR_N     0x008
 167 #define MACSR_Z     0x004
 168 #define MACSR_V     0x002
 169 #define MACSR_EV    0x001
 170
 171 void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
 172 void m68k_set_macsr(CPUM68KState *env, uint32_t val);
 173 void m68k_switch_sp(CPUM68KState *env);
 174
 175 #define M68K_FPCR_PREC (1 << 6)
 176
 177 void do_m68k_semihosting(CPUM68KState *env, int nr);
 178
 179 /* There are 4 ColdFire core ISA revisions: A, A+, B and C.
 180    Each feature covers the subset of instructions common to the
 181    ISA revisions mentioned.  */
 182
 183 enum m68k_features {
 184     M68K_FEATURE_CF_ISA_A,
 185     M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
 186     M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
 187     M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
 188     M68K_FEATURE_CF_FPU,
 189     M68K_FEATURE_CF_MAC,
 190     M68K_FEATURE_CF_EMAC,
 191     M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
 192     M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
 193     M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
 194     M68K_FEATURE_WORD_INDEX /* word sized address index registers.  */
 195 };
 196
 197 static inline int m68k_feature(CPUM68KState *env, int feature)
 198 {
 199     return (env->features & (1u << feature)) != 0;
 200 }
 201
 202 void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 203
 204 void register_m68k_insns (CPUM68KState *env);
 205
 206 #ifdef CONFIG_USER_ONLY
 207 /* Linux uses 8k pages.  */
 208 #define TARGET_PAGE_BITS 13
 209 #else
 210 /* Smallest TLB entry size is 1k.  */
 211 #define TARGET_PAGE_BITS 10
 212 #endif
 213
 214 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 215 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 216
 217 #define cpu_init cpu_m68k_init
 218 #define cpu_exec cpu_m68k_exec
 219 #define cpu_gen_code cpu_m68k_gen_code
 220 #define cpu_signal_handler cpu_m68k_signal_handler
 221 #define cpu_list m68k_cpu_list
 222
 223 /* MMU modes definitions */
 224 #define MMU_MODE0_SUFFIX _kernel
 225 #define MMU_MODE1_SUFFIX _user
 226 #define MMU_USER_IDX 1
 227 static inline int cpu_mmu_index (CPUState *env)
 228 {
 229     return (env->sr & SR_S) == 0 ? 1 : 0;
 230 }
 231
 232 int cpu_m68k_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
 233                               int mmu_idx, int is_softmmu);
 234 #define cpu_handle_mmu_fault cpu_m68k_handle_mmu_fault
 235
 236 #if defined(CONFIG_USER_ONLY)
 237 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 238 {
 239     if (newsp)
 240         env->aregs[7] = newsp;
 241     env->dregs[0] = 0;
 242 }
 243 #endif
 244
 245 #include "cpu-all.h"
 246
 247 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 248                                         target_ulong *cs_base, int *flags)
 249 {
 250     *pc = env->pc;
 251     *cs_base = 0;
 252     *flags = (env->fpcr & M68K_FPCR_PREC)       /* Bit  6 */
 253             | (env->sr & SR_S)                  /* Bit  13 */
 254             | ((env->macsr >> 4) & 0xf);        /* Bits 0-3 */
 255 }
 256
 257 #endif