Print Page - A trick for "m2m" macro

Title: A trick for "m2m" macro
Post by: HSE on January 01, 2022, 06:43:31 AM

Hi all!

ObjAsm m2m macro is a little problematic for dual bitness because in 32 bit can trash one register (and in 32 bits registers are few). But a little trick can prevent that:

Code Select

m2m [xsi].orden, xordenmodelo, @if64bits(r13)

Code Select

@if64bits macro RegAux
    if @WordSize eq 4
        exitm <>
    else
        exitm <&RegAux>
    endif    
endm

Then:

Code Select

32bits:
00407ADC | FF 75 0C                 | push dword ptr ss:[ebp + C]             |
00407ADF | 8F 46 10                 | pop dword ptr ds:[esi + 10]             |

64bits:
00007FF781378601 | 4C 8B 6D 28              | mov r13,qword ptr ss:[rbp+28]           |
00007FF781378605 | 4C 89 6E 1C              | mov qword ptr ds:[rsi+1C],r13           |

Regards, HSE.

Title: Re: A trick for "m2m" macro
Post by: Biterider on January 02, 2022, 04:19:19 AM

Hi HSE
Nice trick. Thanks for sharing it :thumbsup:

Biterider

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Projects => ObjAsm => Topic started by: HSE on January 01, 2022, 06:43:31 AM