Mercurial > repos > blastem
view runtime_32.S @ 589:2dde38c1744f
Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 11 Mar 2014 09:44:47 -0700 |
parents | 96489fb27dbf |
children | 5a6ff0d76032 |
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invalid_msg: .asciz "Invalid instruction at %X\n" .global m68k_invalid m68k_invalid: push %ecx push invalid_msg xor %eax, %eax call printf push $1 call exit .global bcd_add bcd_add: xchg %eax, %edi mov %cl, %ch mov %al, %ah and $0xF, %ch and $0xF, %ah and $0xF0, %cl and $0xF0, %al add %ah, %ch cmp $10, %ch jb no_adjust add $6, %ch no_adjust: add %ch, %al add %al, %cl mov $0, %ch jc def_adjust cmp $0xA0, %cl jb no_adjust_h def_adjust: add $0x60, %cl mov $1, %ch no_adjust_h: mov %edi, %eax ret .global bcd_sub bcd_sub: xchg %eax, %edi mov %cl, %ch mov %al, %ah and $0xF, %ch and $0xF, %ah and $0xF0, %cl and $0xF0, %al sub %ah, %ch cmp $10, %ch jb no_adjusts sub $6, %ch no_adjusts: add %ch, %cl sub %al, %cl mov $0, %ch jc def_adjusts cmp $0xA0, %cl jb no_adjust_hs def_adjusts: sub $0x60, %cl mov $1, %ch no_adjust_hs: mov %edi, %eax ret