167 lines
4.4 KiB
C
167 lines
4.4 KiB
C
/* Main header for the Hitachi h8/300 architecture. */
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#include "config.h"
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#include "bfd.h"
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#ifndef SIM_MAIN_H
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#define SIM_MAIN_H
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#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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/* avolkov:
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Next 2 macros are ugly for any workstation, but while they're work.
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Memory size MUST be configurable. */
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#define H8300H_MSIZE (1 << 24)
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#define H8300S_MSIZE (1 << 24)
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#define CSIZE 1024
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enum h8_regnum {
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R0_REGNUM = 0,
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R1_REGNUM = 1,
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R2_REGNUM = 2,
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R3_REGNUM = 3,
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R4_REGNUM = 4,
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R5_REGNUM = 5,
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R6_REGNUM = 6,
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R7_REGNUM = 7,
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SP_REGNUM = R7_REGNUM, /* Contains address of top of stack */
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FP_REGNUM = R6_REGNUM, /* Contains address of executing
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stack frame */
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CCR_REGNUM = 8, /* Contains processor status */
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PC_REGNUM = 9, /* Contains program counter */
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CYCLE_REGNUM = 10,
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EXR_REGNUM = 11,
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INST_REGNUM = 12,
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TICK_REGNUM = 13,
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MACH_REGNUM = 14,
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MACL_REGNUM = 15,
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SBR_REGNUM = 16,
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VBR_REGNUM = 17,
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ZERO_REGNUM = 18
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};
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enum h8_typecodes {
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OP_NULL,
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OP_REG, /* Register direct. */
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OP_LOWREG, /* Special reg syntax for "bra". */
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OP_DISP, /* Register indirect w/displacement. */
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/* Note: h8300, h8300h, and h8300s permit only pre-decr and post-incr. */
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OP_PREDEC, /* Register indirect w/pre-decrement. */
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OP_POSTDEC, /* Register indirect w/post-decrement. */
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OP_PREINC, /* Register indirect w/pre-increment. */
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OP_POSTINC, /* Register indirect w/post-increment. */
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OP_PCREL, /* PC Relative. */
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OP_MEM, /* Absolute memory address. */
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OP_CCR, /* Condition Code Register. */
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OP_IMM, /* Immediate value. */
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/*OP_ABS*/ /* Un-used (duplicates op_mem?). */
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OP_EXR, /* EXtended control Register. */
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OP_SBR, /* Vector Base Register. */
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OP_VBR, /* Short-address Base Register. */
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OP_MACH, /* Multiply Accumulator - high. */
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OP_MACL, /* Multiply Accumulator - low. */
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/* FIXME: memory indirect? */
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OP_INDEXB, /* Byte index mode */
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OP_INDEXW, /* Word index mode */
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OP_INDEXL /* Long index mode */
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};
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#include "sim-basics.h"
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#include "sim-base.h"
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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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/* Struct for instruction decoder. */
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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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ea_type op3;
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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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} decoded_inst;
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struct _sim_cpu {
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unsigned int regs[20]; /* 8 GR's plus ZERO, SBR, and VBR. */
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unsigned int pc;
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int macS; /* MAC Saturating mode */
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int macV; /* MAC Overflow */
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int macN; /* MAC Negative */
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int macZ; /* MAC Zero */
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int delayed_branch;
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char **command_line; /* Pointer to command line arguments. */
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unsigned char *memory;
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unsigned char *eightbit;
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int mask;
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sim_cpu_base base;
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};
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/* The sim_state struct. */
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struct sim_state {
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sim_cpu *cpu[MAX_NR_PROCESSORS];
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unsigned int sim_cache_size;
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decoded_inst *sim_cache;
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unsigned short *cache_idx;
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unsigned long memory_size;
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int cache_top;
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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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sim_state_base base;
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};
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/* The current state of the processor; registers, memory, etc. */
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#define cpu_set_pc(CPU, VAL) (((CPU)->pc) = (VAL))
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#define cpu_get_pc(CPU) (((CPU)->pc))
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/* Magic numbers used to distinguish an exit from a breakpoint. */
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#define LIBC_EXIT_MAGIC1 0xdead
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#define LIBC_EXIT_MAGIC2 0xbeef
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/* Local version of macros for decoding exit status.
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(included here rather than try to find target version of wait.h)
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*/
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#define SIM_WIFEXITED(V) (((V) & 0xff) == 0)
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#define SIM_WIFSTOPPED(V) (!SIM_WIFEXITED (V))
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#define SIM_WEXITSTATUS(V) (((V) >> 8) & 0xff)
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#define SIM_WSTOPSIG(V) ((V) & 0x7f)
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#endif /* SIM_MAIN_H */
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