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https://github.com/holub/mame
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ns32000: initial cpu emulation
* implemented most instructions * preliminary interrupt/trap support * no fpu or mmu yet * took over copyright with permission * minor disassembler improvements
This commit is contained in:
Patrick Mackinlay
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@ -1,39 +1,21 @@
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// license:BSD-3-Clause
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// copyright-holders:Nigel Barnes
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/*****************************************************************************
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*
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* ns32000.h
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*
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* NS32000 CPU family
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*
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*****************************************************************************/
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// copyright-holders:Patrick Mackinlay
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#ifndef MAME_CPU_NS32016_NS32016_H
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#define MAME_CPU_NS32016_NS32016_H
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#ifndef MAME_CPU_NS32000_NS32000_H
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#define MAME_CPU_NS32000_NS32000_H
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#pragma once
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/***********************************************************************
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CONSTANTS
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***********************************************************************/
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/***********************************************************************
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TYPE DEFINITIONS
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***********************************************************************/
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class ns32000_cpu_device : public cpu_device
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class ns32000_device : public cpu_device
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{
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public:
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// construction/destruction
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ns32000_cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
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ns32000_device(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock);
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protected:
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ns32000_cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, int databits, int addrbits);
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ns32000_device(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock, int databits, int addrbits);
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// device-level overrides
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// device_t overrides
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virtual void device_start() override;
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virtual void device_reset() override;
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@ -45,105 +27,106 @@ protected:
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virtual void execute_set_input(int inputnum, int state) override;
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virtual bool execute_input_edge_triggered(int inputnum) const noexcept override { return inputnum == INPUT_LINE_NMI; }
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// device_memory_interface overrides
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virtual space_config_vector memory_space_config() const override;
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virtual bool memory_translate(int spacenum, int intention, offs_t &address) override;
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// device_state_interface overrides
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virtual void state_string_export(device_state_entry const &entry, std::string &str) const override;
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// device_disasm_interface overrides
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virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
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// addressing modes
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enum
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{
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ADDRESSING_MODE_REGISTER_0 = 0,
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ADDRESSING_MODE_REGISTER_1,
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ADDRESSING_MODE_REGISTER_2,
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ADDRESSING_MODE_REGISTER_3,
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ADDRESSING_MODE_REGISTER_4,
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ADDRESSING_MODE_REGISTER_5,
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ADDRESSING_MODE_REGISTER_6,
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ADDRESSING_MODE_REGISTER_7,
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ADDRESSING_MODE_REGISTER_0_RELATIVE,
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ADDRESSING_MODE_REGISTER_1_RELATIVE,
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ADDRESSING_MODE_REGISTER_2_RELATIVE,
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ADDRESSING_MODE_REGISTER_3_RELATIVE,
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ADDRESSING_MODE_REGISTER_4_RELATIVE,
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ADDRESSING_MODE_REGISTER_5_RELATIVE,
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ADDRESSING_MODE_REGISTER_6_RELATIVE,
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ADDRESSING_MODE_REGISTER_7_RELATIVE,
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ADDRESSING_MODE_FRAME_MEMORY_RELATIVE,
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ADDRESSING_MODE_STACK_MEMORY_RELATIVE,
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ADDRESSING_MODE_STATIC_MEMORY_RELATIVE,
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ADDRESSING_MODE_RESERVED,
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ADDRESSING_MODE_IMMEDIATE,
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ADDRESSING_MODE_ABSOLUTE,
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ADDRESSING_MODE_EXTERNAL,
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ADDRESSING_MODE_TOP_OF_STACK,
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ADDRESSING_MODE_FRAME_MEMORY,
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ADDRESSING_MODE_STACK_MEMORY,
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ADDRESSING_MODE_STATIC_MEMORY,
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ADDRESSING_MODE_PROGRAM_MEMORY,
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ADDRESSING_MODE_INDEX_BYTES,
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ADDRESSING_MODE_INDEX_WORDS,
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ADDRESSING_MODE_INDEX_DOUBLE_WORDS,
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ADDRESSING_MODE_INDEX_QUAD_WORDS,
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};
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// registers
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enum
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{
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NS32000_PC = 1,
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NS32000_SB, NS32000_FP, NS32000_SP1, NS32000_SP0, NS32000_INTBASE, NS32000_PSR, NS32000_MOD,
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NS32000_R0, NS32000_R1, NS32000_R2, NS32000_R3, NS32000_R4, NS32000_R5, NS32000_R6, NS32000_R7,
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};
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private:
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enum addr_mode_type : unsigned
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{
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IMM,
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REG,
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MEM,
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IND,
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EXT,
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TOS,
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};
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struct addr_mode
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{
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addr_mode(unsigned gen)
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: gen(gen)
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, base(0)
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, disp(0)
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{};
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void rmw() { if (type == TOS) type = MEM; }
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void addr() { if (type == TOS) type = MEM; }
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void regaddr() { if (type == TOS) type = MEM; }
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unsigned gen;
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addr_mode_type type;
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u32 base;
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u32 disp;
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};
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// instruction decoding helpers
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s32 displacement(unsigned &bytes);
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void decode(addr_mode *mode, unsigned size, unsigned &bytes);
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// operand read/write helpers
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u32 ea(addr_mode const mode);
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u32 gen_read(addr_mode mode, unsigned size);
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s32 gen_read_sx(addr_mode mode, unsigned size);
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void gen_write(addr_mode mode, unsigned size, u64 data);
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// other execution helpers
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bool condition(unsigned const cc);
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void flags(u32 const src1, u32 const src2, u32 const dest, unsigned const size, bool const subtraction);
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void interrupt(unsigned const vector, u32 const return_address, bool const trap = true);
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// configuration
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address_space_config m_program_config;
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address_space_config m_interrupt_config;
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// emulation state
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int m_icount;
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u32 m_pc;
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u32 m_sb;
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u32 m_fp;
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u32 m_sp1;
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u32 m_sp0;
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u32 m_intbase;
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u32 m_psr;
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u32 m_mod;
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memory_access<24, 1, 0, ENDIANNESS_LITTLE>::cache m_bus[16];
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u32 m_pc; // program counter
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u32 m_sb; // static base
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u32 m_fp; // frame pointer
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u32 m_sp1; // user stack pointer
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u32 m_sp0; // interrupt stack pointer
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u32 m_intbase; // interrupt base
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u16 m_psr; // processor status
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u16 m_mod; // module
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u8 m_cfg; // configuration
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u32 m_r[8];
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u32 m_f[8];
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u8 m_irq_line;
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u8 m_nmi_line;
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bool m_nmi_line;
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bool m_int_line;
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bool m_wait;
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};
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class ns32008_cpu_device : public ns32000_cpu_device
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class ns32008_device : public ns32000_device
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{
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public:
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ns32008_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
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ns32008_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
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};
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class ns32016_cpu_device : public ns32000_cpu_device
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class ns32016_device : public ns32000_device
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{
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public:
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ns32016_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
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ns32016_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
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};
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class ns32032_cpu_device : public ns32000_cpu_device
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class ns32032_device : public ns32000_device
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{
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public:
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ns32032_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
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ns32032_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
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};
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/***********************************************************************
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DEVICE TYPE DECLARATIONS
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***********************************************************************/
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DECLARE_DEVICE_TYPE(NS32008, ns32008_device)
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DECLARE_DEVICE_TYPE(NS32016, ns32016_device)
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DECLARE_DEVICE_TYPE(NS32032, ns32032_device)
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DECLARE_DEVICE_TYPE(NS32008, ns32008_cpu_device)
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DECLARE_DEVICE_TYPE(NS32016, ns32016_cpu_device)
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DECLARE_DEVICE_TYPE(NS32032, ns32032_cpu_device)
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#endif // MAME_CPU_NS32016_NS32016_H
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#endif // MAME_CPU_NS32000_NS32000_H
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@ -272,7 +272,7 @@ const char *const ns32000_disassembler::Format2[] =
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};
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const char *const ns32000_disassembler::Format3[] =
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{
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"CXPD", "Trap (UND)", "BICPSR", "Trap (UND)", "JUMP", "Trap (UND)", "BISPSR", "Trap (UND)", "Trap (UND)", "Trap (UND)", "ADJSPi", "Trap (UND)", "JSR", "Trap (UND)", "CASEi", "Trap (UND)"
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"CXPD", "Trap (UND)", "BICPSRi", "Trap (UND)", "JUMP", "Trap (UND)", "BISPSRi", "Trap (UND)", "Trap (UND)", "Trap (UND)", "ADJSPi", "Trap (UND)", "JSR", "Trap (UND)", "CASEi", "Trap (UND)"
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};
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const char *const ns32000_disassembler::Format4[] =
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{
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@ -569,7 +569,10 @@ void ns32000_disassembler::stream_gen(std::ostream &stream, u8 gen_addr, u8 op_l
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/* External */
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disp1 = get_disp(pc, opcodes);
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disp2 = get_disp(pc, opcodes);
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util::stream_format(stream, "EXT(%d)+%d", disp1, disp2);
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if (disp2)
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util::stream_format(stream, "EXT(%d)+%d", disp1, disp2);
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else
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util::stream_format(stream, "EXT(%d)", disp1);
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break;
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case 0x17:
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/* Top Of Stack */
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