ref: b502a62da2ec6058923db94f87ecc2d29db2fa77
dir: /emu/9front/asm-amd64.s/
TEXT tramp(SB),$0 /* RARG has the first argument - new stack */ /* even though the first argument is in RARG, the 0(FP) is still filled with some value */ /* FP is 64 bytes from SP(?) as there is a SUBQ $0x40, SP on function entry */ MOVQ fn+8(FP), CX /* func to exec - second argument */ MOVQ arg+16(FP),DX /* argument to the function */ LEAQ -16(RARG), SP /* new stack */ MOVQ DX, RARG PUSHQ RARG /* not sure why I need this, but, using it to balance the POPQ below */ CALL *CX POPQ AX MOVQ $0, RARG PUSHQ RARG /* not sure why I need this PUSHQ and CALL. Why not just a JMP to _exits() */ CALL _exits(SB) POPQ AX RET TEXT vstack(SB),$0 /* MOVL arg+0(FP), AX not needed as the first argument is in RARG */ MOVQ ustack(SB), SP PUSHQ RARG /* cannot figure out why I need this. But, the compiler will not compile without this */ CALL exectramp(SB) POPQ AX /* dammit ken! */ RET TEXT FPsave(SB), 1, $0 FSTENV 0(RARG) /* in amd64, the first argument is passed in RARG */ RET TEXT FPrestore(SB), 1, $0 FLDENV 0(RARG) RET