1// Copyright 2012 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5#include "textflag.h" 6#include "funcdata.h" 7 8// The frames of each of the two functions below contain two locals, at offsets 9// that are known to the runtime. 10// 11// The first local is a bool called retValid with a whole pointer-word reserved 12// for it on the stack. The purpose of this word is so that the runtime knows 13// whether the stack-allocated return space contains valid values for stack 14// scanning. 15// 16// The second local is an abi.RegArgs value whose offset is also known to the 17// runtime, so that a stack map for it can be constructed, since it contains 18// pointers visible to the GC. 19#define LOCAL_RETVALID 40 20#define LOCAL_REGARGS 48 21 22// The frame size of the functions below is 23// 32 (args of callReflect) + 8 (bool + padding) + 392 (abi.RegArgs) = 432. 24 25// makeFuncStub is the code half of the function returned by MakeFunc. 26// See the comment on the declaration of makeFuncStub in makefunc.go 27// for more details. 28// No arg size here, runtime pulls arg map out of the func value. 29TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432 30 NO_LOCAL_POINTERS 31 // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this 32 // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. 33 ADD $LOCAL_REGARGS, RSP, R20 34 CALL runtime·spillArgs(SB) 35 MOVD R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area 36 MOVD R26, R0 37 MOVD R20, R1 38 CALL ·moveMakeFuncArgPtrs<ABIInternal>(SB) 39 MOVD 32(RSP), R26 40 MOVD R26, 8(RSP) 41 MOVD $argframe+0(FP), R3 42 MOVD R3, 16(RSP) 43 MOVB $0, LOCAL_RETVALID(RSP) 44 ADD $LOCAL_RETVALID, RSP, R3 45 MOVD R3, 24(RSP) 46 ADD $LOCAL_REGARGS, RSP, R3 47 MOVD R3, 32(RSP) 48 CALL ·callReflect(SB) 49 ADD $LOCAL_REGARGS, RSP, R20 50 CALL runtime·unspillArgs(SB) 51 RET 52 53// methodValueCall is the code half of the function returned by makeMethodValue. 54// See the comment on the declaration of methodValueCall in makefunc.go 55// for more details. 56// No arg size here; runtime pulls arg map out of the func value. 57TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432 58 NO_LOCAL_POINTERS 59 // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this 60 // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. 61 ADD $LOCAL_REGARGS, RSP, R20 62 CALL runtime·spillArgs(SB) 63 MOVD R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area 64 MOVD R26, R0 65 MOVD R20, R1 66 CALL ·moveMakeFuncArgPtrs<ABIInternal>(SB) 67 MOVD 32(RSP), R26 68 MOVD R26, 8(RSP) 69 MOVD $argframe+0(FP), R3 70 MOVD R3, 16(RSP) 71 MOVB $0, LOCAL_RETVALID(RSP) 72 ADD $LOCAL_RETVALID, RSP, R3 73 MOVD R3, 24(RSP) 74 ADD $LOCAL_REGARGS, RSP, R3 75 MOVD R3, 32(RSP) 76 CALL ·callMethod(SB) 77 ADD $LOCAL_REGARGS, RSP, R20 78 CALL runtime·unspillArgs(SB) 79 RET 80