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-rw-r--r--src/devices/cpu/vax/vaxdasm.h50
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diff --git a/src/devices/cpu/vax/vaxdasm.h b/src/devices/cpu/vax/vaxdasm.h
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+++ b/src/devices/cpu/vax/vaxdasm.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_CPU_VAX_VAXDASM_H
+#define MAME_CPU_VAX_VAXDASM_H
+
+#pragma once
+
+class vax_disassembler : public util::disasm_interface
+{
+public:
+ enum class mode : u8
+ {
+ none,
+ rb, srb, urb, cntb, rw, srw, urw, mskw, rl, srl, url, posl, prl, rq, srq, urq, ro, uro,
+ mb, mw, ml, mq, mo,
+ wb, ww, wl, wq, wo,
+ ab, aw, al, aq, ao,
+ bb, bw,
+ vb
+ };
+
+ struct opdef
+ {
+ std::string_view mnemonic;
+ mode operand[6];
+ u32 flags;
+ };
+
+ // construction/destruction
+ vax_disassembler();
+
+ static bool is_read_mode(mode m);
+ static const mode *get_operands(u8 op);
+
+protected:
+ // disassembler overrides
+ virtual u32 opcode_alignment() const override;
+ virtual offs_t disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params) override;
+
+private:
+ // internal helpers
+ void format_immediate(std::ostream &stream, u32 i) const;
+ void format_signed(std::ostream &stream, s32 value) const;
+ void format_relative(std::ostream &stream, u32 pc, s32 displ) const;
+ void format_register_mask(std::ostream &stream, u16 mask) const;
+ offs_t disassemble_inst(std::ostream &stream, const opdef &inst, offs_t &pc, offs_t ppc, const data_buffer &opcodes) const;
+};
+
+#endif // MAME_CPU_VAX_VAXDASM_H