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// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/***************************************************************************
WE|AT&T DSP16 series disassembler
***************************************************************************/
#ifndef MAME_CPU_DSP16_DSP16DIS_H
#define MAME_CPU_DSP16_DSP16DIS_H
#pragma once
#include <iosfwd>
#include <string>
class dsp16_disassembler : public util::disasm_interface
{
public:
// interface to live CPU
class cpu
{
public:
enum class predicate : u8 { INDETERMINATE, TAKEN, SKIPPED };
virtual predicate check_con(offs_t pc, u16 op) const = 0;
virtual predicate check_branch(offs_t pc) const = 0;
protected:
virtual ~cpu() = default;
};
// construction/destruction
dsp16_disassembler();
dsp16_disassembler(cpu const &host);
virtual ~dsp16_disassembler() = default;
// util::disasm_interface implementation
virtual u32 interface_flags() const override;
virtual u32 page_address_bits() const override;
virtual u32 opcode_alignment() const override;
virtual offs_t disassemble(std::ostream &stream, offs_t pc, data_buffer const &opcodes, data_buffer const ¶ms) override;
private:
struct result { bool nop; bool ambiguous; std::string text; };
// sub-instruction helpers
static result dasm_int(u16 op);
static result dasm_con(u16 op);
static result dasm_b(u16 op, u32 &flags);
static result dasm_ja(u16 op, offs_t pc, u32 &flags);
static result dasm_f1(u16 op);
static result dasm_f2(u16 op);
static result dasm_r(u16 op);
static result dasm_x(u16 op);
static result dasm_y(u16 op);
static result dasm_z(u16 op);
// common maths
static constexpr offs_t inc_pc(offs_t pc, offs_t inc);
// live state checks
char const *check_branch_predicate(offs_t pc) const;
char const *check_branch_con(offs_t pc, u16 op) const;
char const *check_special_con(offs_t pc, u16 op) const;
// access to live CPU
cpu const *const m_host;
};
#endif // MAME_CPU_DSP16_DSP16DIS_H
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