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x86 code gen, initial work on translator
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 27 Nov 2012 09:28:13 -0800 |
parents | |
children | 3e7bfde7606e |
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cmp.w <ea>, Dn 4(1/0) + <ea> time cmp.l <ea>, Dn 6(1/0) + <ea> time cmp.w #num, Dn 4(1/0) + 4(1/0) cmp.l #num, Dn 6(1/0) + 8(2/0) cmpi.w #num, Dn 8(2/0) cmpi.l #num, Dn 14(3/0) movem subtype field (bits 9-11) = 110 or 100 depending on direction bit 8 = 0 bit 7 = 1 bit 6 = size x86-64 registers in 68K core 1. native stack pointer 2. current cycle count 3. target cycle count 4. cartridge address 5. work ram address 6. scratch register 7. context pointer (contains 68K registers and memory pointers not in registers) 8. status register (maybe, depends on how well I can abuse native x86 status stuff) Rest of registers used for holding 68K registers rax = cycle counter bl = N flag bh = V flag rcx = scratch register dl = Z flag dh = C flag rbp = target cycle count rsi = context pointer rdi = d0 r8 = d1 r9 = d2 r10 = d3 r11 = a0 r12 = a1 r13 = a6 r14 = a7 r15 = work ram address r16 = cartridge address rsp = native stack pointer 68K context: uint8_t flags[5]; uint8_t pad??[3] uint32_t dregs[8]; //8 + 4 * reg uint32_t aregs[8]; //40 + 4 * reg ..... x86-64 registers in Z80 core ax = AF bx = BC cx = DE dx = HL 1. native stack pointer 2. current cycle count 3. target cycle count