October 24, 2019 Convert gcc assembly to ldc one | ||||
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Hello! Could you help to port this code: ``` __asm__ __volatile__ ( "990: nop\n" \ ".pushsection .note.stapsdt,\"?\",\"note\"\n" \ ".balign 4\n" \ ".4byte 992f-991f, 994f-993f, 3\n" \ "991: .asciz \"stapsdt\"\n" \ "992: .balign 4\n" \ "993: .8byte 990b\n" \ ".8byte _.stapsdt.base\n" \ ".8byte 0\n" \ ".asciz \"myapp\"\n" \ ".asciz \"func_call\"\n" \ ".asciz \"%n[_SDT_S1]@%[_SDT_A1] %n[_SDT_S2]@%[_SDT_A2]\"\n" \ "994: .balign 4\n" \ ".popsection\n" :: [_SDT_S1] "n" (4), [_SDT_A1] "nor" ((a)), [_SDT_S2] "n" (4), [_SDT_A2] "nor" ((b)) ); ``` I failed to find what is the ldc analog to gnu assembler InputOperands. What I need is converting ((a)) expression to `-4(%rbp)` string and ((b)) expression to `-8(%rbp)` |
October 25, 2019 Re: Convert gcc assembly to ldc one | ||||
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Posted in reply to drug | On 10/24/19 2:13 PM, drug wrote: > Hello! > > Could you help to port this code: > ``` > __asm__ __volatile__ ( > "990: nop\n" \ > ".pushsection .note.stapsdt,\"?\",\"note\"\n" \ > ".balign 4\n" \ > ".4byte 992f-991f, 994f-993f, 3\n" \ > "991: .asciz \"stapsdt\"\n" \ > "992: .balign 4\n" \ > "993: .8byte 990b\n" \ > ".8byte _.stapsdt.base\n" \ > ".8byte 0\n" \ > ".asciz \"myapp\"\n" \ > ".asciz \"func_call\"\n" \ > ".asciz \"%n[_SDT_S1]@%[_SDT_A1] %n[_SDT_S2]@%[_SDT_A2]\"\n" \ > "994: .balign 4\n" \ > ".popsection\n" > :: [_SDT_S1] "n" (4), > [_SDT_A1] "nor" ((a)), > [_SDT_S2] "n" (4), > [_SDT_A2] "nor" ((b)) > ); > ``` > > I failed to find what is the ldc analog to gnu assembler InputOperands. What I need is converting ((a)) expression to `-4(%rbp)` string and ((b)) expression to `-8(%rbp)` The answer is: ``` __asm ( `990: nop .pushsection .note.stapsdt,"?","note" .balign 4 .4byte 992f-991f, 994f-993f, 3 991: .asciz "stapsdt" 992: .balign 4 993: .8byte 990b .8byte _.stapsdt.base .8byte 0 .asciz "myapp" .asciz "func_call" .asciz "${0:n}@${1} ${2:n}@${3}" 994: .balign 4 .popsection`, "n, r, n, r", 4, a, 4, b); ``` https://godbolt.org/z/TUejUr |
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