target-m68k/cpu.h

   1 /*
   2  * m68k virtual CPU header
   3  *
   4  *  Copyright (c) 2005-2006 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 typedef struct CPUM68KState {
  54     uint32_t dregs[8];
  55     uint32_t aregs[8];
  56     uint32_t pc;
  57     uint32_t sr;
  58
  59     /* Condition flags.  */
  60     uint32_t cc_op;
  61     uint32_t cc_dest;
  62     uint32_t cc_src;
  63     uint32_t cc_x;
  64
  65     float64 fregs[8];
  66     float64 fp_result;
  67     uint32_t fpcr;
  68     uint32_t fpsr;
  69     float_status fp_status;
  70
  71     /* Temporary storage for DIV helpers.  */
  72     uint32_t div1;
  73     uint32_t div2;
  74
  75     /* MMU status.  */
  76     struct {
  77         uint32_t ar;
  78     } mmu;
  79     /* ??? remove this.  */
  80     uint32_t t1;
  81
  82     /* exception/interrupt handling */
  83     jmp_buf jmp_env;
  84     int exception_index;
  85     int interrupt_request;
  86     int user_mode_only;
  87     uint32_t address;
  88
  89     uint32_t qregs[MAX_QREGS];
  90
  91     CPU_COMMON
  92 } CPUM68KState;
  93
  94 CPUM68KState *cpu_m68k_init(void);
  95 int cpu_m68k_exec(CPUM68KState *s);
  96 void cpu_m68k_close(CPUM68KState *s);
  97 /* you can call this signal handler from your SIGBUS and SIGSEGV
  98    signal handlers to inform the virtual CPU of exceptions. non zero
  99    is returned if the signal was handled by the virtual CPU.  */
 100 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
 101                            void *puc);
 102 void cpu_m68k_flush_flags(CPUM68KState *, int);
 103
 104 enum {
 105     CC_OP_DYNAMIC, /* Use env->cc_op  */
 106     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
 107     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
 108     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
 109     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
 110     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
 111     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
 112     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
 113     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
 114     CC_OP_SHL,   /* CC_DEST = source, CC_SRC = shift */
 115     CC_OP_SHR,   /* CC_DEST = source, CC_SRC = shift */
 116     CC_OP_SAR,   /* CC_DEST = source, CC_SRC = shift */
 117 };
 118
 119 #define CCF_C 0x01
 120 #define CCF_V 0x02
 121 #define CCF_Z 0x04
 122 #define CCF_N 0x08
 123 #define CCF_X 0x01
 124
 125 typedef struct m68k_def_t m68k_def_t;
 126
 127 m68k_def_t *m68k_find_by_name(const char *);
 128 void cpu_m68k_register(CPUM68KState *, m68k_def_t *);
 129
 130 #define M68K_FPCR_PREC (1 << 6)
 131
 132 #ifdef CONFIG_USER_ONLY
 133 /* Linux uses 8k pages.  */
 134 #define TARGET_PAGE_BITS 13
 135 #else
 136 /* Smallest TLB entry size is 1k.  */
 137 #define TARGET_PAGE_BITS 10
 138 #endif
 139 #include "cpu-all.h"
 140
 141 #endif