mirror of
https://github.com/mlaux/gb6.git
synced 2026-04-19 17:16:48 +00:00
Matthew Laux
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
#ifndef COMPILER_H
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#define COMPILER_H
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#include <stdint.h>
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#include <stddef.h>
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// D0 = dispatcher return value (next GB PC)
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// D1 = scratch
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// D2 = scratch
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// D3 = scratch
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// D4 = A (GB accumulator)
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// D5 = BC (split: 0x00BB00CC)
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// D6 = DE (split: 0x00DD00EE)
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// D7 = flags (ZNHC0000)
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// A0 = scratch
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// A1 = scratch
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// A2 = HL (contiguous: 0xHHLL)
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// A3 = SP (base + SP, for direct stack access)
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// A4 = runtime context pointer
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// A5 = reserved (Mac "A5 world")
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// A6 = reserved (Mac frame pointer)
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// A7 = 68k stack pointer
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#define REG_68K_D_NEXT_PC 0
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#define REG_68K_D_SCRATCH_1 1
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#define REG_68K_D_SCRATCH_2 2
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#define REG_68K_D_SCRATCH_3 3
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#define REG_68K_D_A 4
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#define REG_68K_D_BC 5
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#define REG_68K_D_DE 6
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#define REG_68K_D_FLAGS 7
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#define REG_68K_A_SCRATCH_1 0
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#define REG_68K_A_SCRATCH_2 1
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#define REG_68K_A_HL 2
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#define REG_68K_A_SP 3
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#define REG_68K_A_CTX 4
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// Runtime context offsets
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#define JIT_CTX_DMG 0
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#define JIT_CTX_READ 4
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#define JIT_CTX_WRITE 8
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struct code_block {
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uint8_t code[256];
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uint16_t m68k_offsets[256];
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size_t length;
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uint16_t gb_cycles; // for timing
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uint16_t src_address; // GB address this block starts at
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uint16_t end_address; // GB address after last instruction
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};
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// Initialize the compiler (call once at startup)
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void compiler_init(void);
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// Compile a basic block starting at the given GB address
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// Returns NULL on failure
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// The block ends when a control flow instruction is encountered
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struct code_block *compile_block(uint16_t src_address, uint8_t *gb_code);
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// Free a compiled block
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void block_free(struct code_block *block);
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// Emit helpers (exposed for testing)
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void emit_byte(struct code_block *block, uint8_t byte);
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void emit_word(struct code_block *block, uint16_t word);
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#endif
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