Mercurial > pub > dyncall > dyncall
view doc/disas_examples/x86.plan9call.disas @ 356:2f64957d6a46
- fix to dynload to build with musl libc (latter has dlinfo but not RTLD_SELF, so fallback to dl_iterate_phdr if on ELF targets)
| author | Tassilo Philipp |
|---|---|
| date | Tue, 25 Feb 2020 16:07:45 +0100 |
| parents | c0390dc85a07 |
| children | 97fff5d9cea1 |
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; void leaf_call(int a, int b, int c, int d, int e, int f) ; { ; } ; ; int nonleaf_call(int a, int b, int c, int d, int e, int f, int g) ; { ; leaf_call(b,c,d,e,f,g); ; return 'x'; ; } ; ; int main() ; { ; nonleaf_call(0,1,2,3,4,5,6); ; return 0; ; } ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8 001020 (1) TEXT leaf_call+0(SB),$0 001020 c3 (3) RET , 001021 (5) TEXT nonleaf_call+0(SB),$28 001021 83ec1c (5) SUBL $28,SP ; prolog (note, there is no register save area at all) 001024 8b442424 (7) MOVL b+36(FP),AX ; | 001028 890424 (7) MOVL AX,(SP) ; | 00102b 8b442428 (7) MOVL c+40(FP),AX ; | 00102f 89442404 (7) MOVL AX,4(SP) ; | 001033 8b44242c (7) MOVL d+44(FP),AX ; | 001037 89442408 (7) MOVL AX,8(SP) ; | fetch in args from prev frame's param area ... 00103b 8b442430 (7) MOVL e+48(FP),AX ; | ... and "push" onto stack 00103f 8944240c (7) MOVL AX,12(SP) ; | 001043 8b442434 (7) MOVL f+52(FP),AX ; | 001047 89442410 (7) MOVL AX,16(SP) ; | 00104b 8b442438 (7) MOVL g+56(FP),AX ; | 00104f 89442414 (7) MOVL AX,20(SP) ; | 001053 e8c8ffffff (7) CALL ,1020+leaf_call ; push return addrss and call 001058 b878000000 (8) MOVL $120,AX ; return value: 'x' -> eax 00105d 83c41c (8) ADDL $28,SP ; | 001060 c3 (8) RET , ; | epilog 001061 (11) TEXT main+0(SB),$32 001061 83ec20 (11) SUBL $32,SP ; prolog (note, there is no register save area at all) 001064 c7042400000000 (13) MOVL $0,(SP) ; arg 0 -> "push" onto stack 00106b b801000000 (13) MOVL $1,AX ; arg 1 -> eax, then ... 001070 89442404 (13) MOVL AX,4(SP) ; ... "pushed" onto stack 001074 b802000000 (13) MOVL $2,AX ; arg 2 -> eax, then ... 001079 89442408 (13) MOVL AX,8(SP) ; ... "pushed" onto stack 00107d b803000000 (13) MOVL $3,AX ; . 001082 8944240c (13) MOVL AX,12(SP) ; . 001086 b804000000 (13) MOVL $4,AX ; . 00108b 89442410 (13) MOVL AX,16(SP) ; . 00108f b805000000 (13) MOVL $5,AX ; . 001094 89442414 (13) MOVL AX,20(SP) ; . 001098 b806000000 (13) MOVL $6,AX ; arg 6 -> eax, then ... 00109d 89442418 (13) MOVL AX,24(SP) ; ... "pushed" onto stack 0010a1 e87bffffff (13) CALL ,1021+nonleaf_call ; push return addrss and call 0010a6 31c0 (14) MOVL $0,AX ; return value 0010a8 83c420 (14) ADDL $32,SP ; | 0010ab c3 (14) RET , ; | epilog ; vim: ft=asm