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m88000: initial execution implementation

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This commit is contained in:
Patrick Mackinlay 2021-02-02 19:22:11 +07:00
parent 2300e37bbc
commit 7c2929dad9
2 changed files with 1478 additions and 41 deletions
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1474
src/devices/cpu/m88000/m88000.cpp
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45
src/devices/cpu/m88000/m88000.h
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@ -11,22 +11,11 @@
#pragma once
#include "softfloat3/source/include/softfloat.h"
class mc88100_device : public cpu_device
{
public:
enum {
M88000_PC,
M88000_R1, M88000_R2, M88000_R3,
M88000_R4, M88000_R5, M88000_R6, M88000_R7,
M88000_R8, M88000_R9, M88000_R10, M88000_R11,
M88000_R12, M88000_R13, M88000_R14, M88000_R15,
M88000_R16, M88000_R17, M88000_R18, M88000_R19,
M88000_R20, M88000_R21, M88000_R22, M88000_R23,
M88000_R24, M88000_R25, M88000_R26, M88000_R27,
M88000_R28, M88000_R29, M88000_R30, M88000_R31,
M88000_PSR, M88000_VBR
};
// construction/destruction
mc88100_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
@ -45,6 +34,21 @@ protected:
// device_memory_interface overrides
virtual space_config_vector memory_space_config() const override;
void execute(u32 const inst);
void exception(unsigned vector, bool const trap = false);
// integer helpers
void set_cr(unsigned const cr, u32 const data);
bool condition(unsigned const m5, u32 const src) const;
u32 cmp(u32 const src1, u32 const src2) const;
bool carry(u32 const src1, u32 const src2, u32 const dest) const;
bool overflow(u32 const src1, u32 const src2, u32 const dest) const;
// floating-point helpers
void set_fcr(unsigned const fcr, u32 const data);
u32 fcmp(float64_t const src1, float64_t const src2);
void fset(unsigned const td, unsigned const d, float64_t const data);
private:
// address spaces
address_space_config m_code_config;
@ -53,9 +57,20 @@ private:
memory_access<32, 2, 0, ENDIANNESS_BIG>::specific m_data_space;
// register storage
u32 m_pc;
u32 m_xip; // execute instruction pointer
u32 m_nip; // next instruction pointer
u32 m_fip; // fetch instruction pointer
u32 m_sb; // scoreboard
u32 m_r[32];
u32 m_cr[21];
u32 m_cr[64];
u32 m_fcr[64];
u32 m_xop;
u32 m_nop;
u32 m_fop;
bool m_int_state;
s32 m_icount;
};