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Documentation, and reorganizing macro definitions
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@ -10,12 +10,44 @@
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*/
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#define MOS6502_MEMSIZE 65536
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/*
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* This is a small macro to make it a bit simpler to set bytes ahead of
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* the PC register position; useful in testing.
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*/
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#define SET_PC_BYTE(cpu, off, byte) \
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vm_segment_set(cpu->memory, cpu->PC + off, byte)
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/*
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* This macro is used to define new instruction handler functions.
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*/
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#define DEFINE_INST(inst) \
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void mos6502_handle_##inst (mos6502 *cpu, vm_8bit oper)
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/*
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* In some address mode resolution, we must factor the carry bit into
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* the arithmetic we perform. In all those cases, if the carry bit is
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* set, we must only add 1 to the addition. The carry variable is,
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* therefore, the literal value we are adding, rather than a boolean
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* signifier.
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*/
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#define CARRY_BIT() \
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vm_8bit carry = 0; \
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if (cpu->P & CARRY) carry = 1
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/*
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* A uniform way of declaring resolve functions for address modes, which
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* is useful in the event that we need to change the function signature.
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*/
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#define DECL_ADDR_MODE(x) \
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extern vm_8bit mos6502_resolve_##x (mos6502 *)
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/*
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* Similarly, a uniform way of declaring instruction handler functions,
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* for the same reasons.
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*/
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#define DECL_INST(x) \
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extern void mos6502_handle_##x (mos6502 *, vm_8bit)
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typedef struct {
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/*
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* Our memory.
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@ -98,31 +130,6 @@ extern vm_8bit mos6502_read_byte(mos6502 *);
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extern int mos6502_addr_mode(vm_8bit);
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extern mos6502_address_resolver mos6502_get_address_resolver(vm_8bit);
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/*
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* In some address mode resolution, we must factor the carry bit into
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* the arithmetic we perform. In all those cases, if the carry bit is
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* set, we must only add 1 to the addition. The carry variable is,
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* therefore, the literal value we are adding, rather than a boolean
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* signifier.
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*/
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#define CARRY_BIT() \
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vm_8bit carry = 0; \
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if (cpu->P & CARRY) carry = 1
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/*
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* A uniform way of declaring resolve functions for address modes, which
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* is useful in the event that we need to change the function signature.
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*/
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#define DECL_ADDR_MODE(x) \
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extern vm_8bit mos6502_resolve_##x (mos6502 *)
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/*
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* Similarly, a uniform way of declaring instruction handler functions,
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* for the same reasons.
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*/
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#define DECL_INST(x) \
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extern void mos6502_handle_##x (mos6502 *, vm_8bit)
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/*
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* All of our address modes
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*/
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