Am Mittwoch, 26. August 2020, 15:35:45 CEST schrieb anthony: > I try to use amd64 assembly with addressing mode base with displacement, > scaled index and scaled index with displacement gforth i.e. > > mov (%rdx,%rcx,1),%rax > mov (%rdx,%rcx,4),%rax > mov 40(%rdx,%rcx,4),%rax > > I installed gforth from git version 0.7.9_20200820 on linux opensuse > 15.1 64 bit. > I included this code to test: > > ABI-CODE A ( -- ) > 500 # AX MOV \ AX := 500 > DX AX MOV \ AX := DX > 200 AX MOV \ AX := (200) > DX ) AX MOV \ AX := (DX) > 40 DX D) AX MOV \ AX := (DX + 40) > \ DX CX I) AX MOV \ AX := (DX + CX) > \ DX CX *4 I) AX MOV \ AX := (DX + CX * 4) *1/2/4/8 > \ 40 DX CX *4 DI) AX MOV \ AX := (DX + CX * 4 + 40) > > DI AX MOV > RET > END-CODE > > Compiling any of the now commented three lines results in an "invalid > memory address" error. > Maybe I am using an invalid syntax? Thought this was the correct syntax > after reading asm.fs > > Every help is very much appreciated. > Anthony
This here works: abi-code test ok 1 ax cx *4 i) dx mov ok 1 3 ax cx *8 di) dx mov ok 1 ret ok 1 end-code see test ABI-Code test 7F38B25582B0: mov rdx,[rax][rcx*4] 7F38B25582B4: mov rdx,$03[rax][rcx*8] 7F38B25582B9: ret end-code Your example doesn't work, though. Looks like some storage is not cleaned after finishing with one instruction. Your syntax is ok. -- Bernd Paysan "If you want it done right, you have to do it yourself" net2o id: kQusJzA;7*?t=uy@X}1GWr!+0qqp_Cn176t4(dQ* https://net2o.de/
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