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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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
  55 typedef struct CPUM68KState {
  56     uint32_t dregs[8];
  57     uint32_t aregs[8];
  58     uint32_t pc;
  59     uint32_t sr;
  60
  61     /* Condition flags.  */
  62     uint32_t cc_op;
  63     uint32_t cc_dest;
  64     uint32_t cc_src;
  65     uint32_t cc_x;
  66
  67     float64 fregs[8];
  68     float64 fp_result;
  69     uint32_t fpcr;
  70     uint32_t fpsr;
  71     float_status fp_status;
  72
  73     /* Temporary storage for DIV helpers.  */
  74     uint32_t div1;
  75     uint32_t div2;
  76
  77     /* MMU status.  */
  78     struct {
  79         uint32_t ar;
  80     } mmu;
  81
  82     /* Control registers.  */
  83     uint32_t vbr;
  84     uint32_t mbar;
  85     uint32_t rambar0;
  86
  87     /* ??? remove this.  */
  88     uint32_t t1;
  89
  90     /* exception/interrupt handling */
  91     jmp_buf jmp_env;
  92     int exception_index;
  93     int interrupt_request;
  94     int user_mode_only;
  95     int halted;
  96
  97     int pending_vector;
  98     int pending_level;
  99
 100     uint32_t qregs[MAX_QREGS];
 101
 102     CPU_COMMON
 103 } CPUM68KState;
 104
 105 CPUM68KState *cpu_m68k_init(void);
 106 int cpu_m68k_exec(CPUM68KState *s);
 107 void cpu_m68k_close(CPUM68KState *s);
 108 void do_interrupt(int is_hw);
 109 /* you can call this signal handler from your SIGBUS and SIGSEGV
 110    signal handlers to inform the virtual CPU of exceptions. non zero
 111    is returned if the signal was handled by the virtual CPU.  */
 112 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 113                            void *puc);
 114 void cpu_m68k_flush_flags(CPUM68KState *, int);
 115
 116 enum {
 117     CC_OP_DYNAMIC, /* Use env->cc_op  */
 118     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 119     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 120     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 121     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 122     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 123     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 124     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 125     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 126     CC_OP_SHL,   /* CC_DEST = source, CC_SRC = shift */
 127     CC_OP_SHR,   /* CC_DEST = source, CC_SRC = shift */
 128     CC_OP_SAR,   /* CC_DEST = source, CC_SRC = shift */
 129 };
 130
 131 #define CCF_C 0x01
 132 #define CCF_V 0x02
 133 #define CCF_Z 0x04
 134 #define CCF_N 0x08
 135 #define CCF_X 0x10
 136
 137 #define SR_I_SHIFT 8
 138 #define SR_I  0x0700
 139 #define SR_M  0x1000
 140 #define SR_S  0x2000
 141 #define SR_T  0x8000
 142
 143 typedef struct m68k_def_t m68k_def_t;
 144
 145 int cpu_m68k_set_model(CPUM68KState *env, const char * name);
 146
 147 void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
 148
 149 #define M68K_FPCR_PREC (1 << 6)
 150
 151 #ifdef CONFIG_USER_ONLY
 152 /* Linux uses 8k pages.  */
 153 #define TARGET_PAGE_BITS 13
 154 #else
 155 /* Smallest TLB entry size is 1k.  */
 156 #define TARGET_PAGE_BITS 10
 157 #endif
 158 #include "cpu-all.h"
 159
 160 #endif