Convert gcc assembly to ldc one

drug drug2004 at bk.ru
Fri Oct 25 08:07:47 UTC 2019


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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