2c5c784255
amd64 passes first argument in RARG (BP) register
which has the be preserved duing _profin() and
_profout() calls. to handle this we introduce
_saveret() and _savearg(). _saveret() returns
AX, _savearg() returns RARG (BP). for archs other
and amd64, _saveret() and _savearg() are the
same function, doing nothing.
restoing works with dummy function:
uintptr
_restore(uintptr, uintptr ret)
{
return ret;
}
...
ret = _saveret();
arg = _savearg();
...
return _restore(arg, ret);
as we pass arg as the first argument, RARG (BP) is
restored.
39 lines
735 B
ArmAsm
39 lines
735 B
ArmAsm
#define NPRIVATES 16
|
|
|
|
TEXT _mainp(SB), 1, $(2*8+NPRIVATES*8)
|
|
MOVQ AX, _tos(SB) /* _tos = arg */
|
|
LEAQ 16(SP), AX
|
|
MOVQ AX, _privates(SB)
|
|
MOVL $NPRIVATES, _nprivates(SB)
|
|
|
|
CALL _profmain(SB) /* _profmain(); */
|
|
|
|
MOVQ _tos+0(SB), DX /* _tos->prof.pp = _tos->prof.next; */
|
|
MOVQ 8(DX), CX
|
|
MOVQ CX, (DX)
|
|
|
|
MOVL inargc-8(FP), RARG /* main(argc, argv); */
|
|
LEAQ inargv+0(FP), AX
|
|
MOVQ AX, 8(SP)
|
|
CALL main(SB)
|
|
|
|
loop:
|
|
MOVQ $_exits<>(SB), RARG
|
|
CALL exits(SB)
|
|
MOVQ $_profin(SB), AX /* force loading of profile */
|
|
JMP loop
|
|
|
|
TEXT _savearg(SB), 1, $0
|
|
MOVQ RARG, AX
|
|
RET
|
|
|
|
TEXT _saveret(SB), 1, $0
|
|
RET /* we want RARG in RARG */
|
|
|
|
TEXT _callpc(SB), 1, $0
|
|
MOVQ 8(RARG), AX
|
|
RET
|
|
|
|
DATA _exits<>+0(SB)/4, $"main"
|
|
GLOBL _exits<>+0(SB), $5
|