89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
#define DEBUG
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/* These define the size of main memory for the simulator.
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Note the size of main memory for the H8/300H is only 256k. Keeping it
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small makes the simulator run much faster and consume less memory.
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The linker knows about the limited size of the simulator's main memory
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on the H8/300H (via the h8300h.sc linker script). So if you change
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H8300H_MSIZE, be sure to fix the linker script too.
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Also note that there's a separate "eightbit" area aside from main
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memory. For simplicity, the simulator assumes any data memory reference
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outside of main memory refers to the eightbit area (in theory, this
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can only happen when simulating H8/300H programs). We make no attempt
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to catch overlapping addresses, wrapped addresses, etc etc. */
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#define H8300_MSIZE (1<<16)
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#define H8300H_MSIZE (1<<18)
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#define CSIZE 1000
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/* Local register names */
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typedef enum
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{
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R0, R1, R2, R3, R4, R5, R6, R7,
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R_ZERO,
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R_PC,
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R_CCR,
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R_HARD_0,
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R_LAST,
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} reg_type;
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/* Structure used to describe addressing */
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typedef struct
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{
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int type;
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int reg;
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int literal;
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} ea_type;
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typedef struct
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{
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ea_type src;
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ea_type dst;
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int opcode;
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int next_pc;
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int oldpc;
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int cycles;
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#ifdef DEBUG
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struct h8_opcode *op;
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#endif
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}
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decoded_inst;
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enum h8300_sim_state {
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SIM_STATE_RUNNING, SIM_STATE_EXITED, SIM_STATE_SIGNALLED, SIM_STATE_STOPPED
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};
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typedef struct
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{
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enum h8300_sim_state state;
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int exception;
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unsigned int regs[9];
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int pc;
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int ccr;
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unsigned char *memory;
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unsigned char *eightbit;
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unsigned short *cache_idx;
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int cache_top;
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int maximum;
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int csize;
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int mask;
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decoded_inst *cache;
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int cycles;
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int insts;
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int ticks;
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int compiles;
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#ifdef ADEBUG
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int stats[O_LAST];
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#endif
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}
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cpu_state_type;
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