asm_arm64.s

     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.
    29  TEXT ·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  #ifdef GOEXPERIMENT_regabiargs
    37  	MOVD	R26, R0
    38  	MOVD	R20, R1
    39  #else
    40  	MOVD	R26, 8(RSP)
    41  	MOVD	R20, 16(RSP)
    42  #endif
    43  	CALL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    44  	MOVD	32(RSP), R26
    45  	MOVD	R26, 8(RSP)
    46  	MOVD	$argframe+0(FP), R3
    47  	MOVD	R3, 16(RSP)
    48  	MOVB	$0, LOCAL_RETVALID(RSP)
    49  	ADD	$LOCAL_RETVALID, RSP, R3
    50  	MOVD	R3, 24(RSP)
    51  	ADD	$LOCAL_REGARGS, RSP, R3
    52  	MOVD	R3, 32(RSP)
    53  	CALL	·callReflect(SB)
    54  	ADD	$LOCAL_REGARGS, RSP, R20
    55  	CALL	runtime·unspillArgs(SB)
    56  	RET
    57  
    58  // methodValueCall is the code half of the function returned by makeMethodValue.
    59  // See the comment on the declaration of methodValueCall in makefunc.go
    60  // for more details.
    61  // No arg size here; runtime pulls arg map out of the func value.
    62  TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432
    63  	NO_LOCAL_POINTERS
    64  	// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
    65  	// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
    66  	ADD	$LOCAL_REGARGS, RSP, R20
    67  	CALL	runtime·spillArgs(SB)
    68  	MOVD	R26, 32(RSP) // outside of moveMakeFuncArgPtrs's arg area
    69  #ifdef GOEXPERIMENT_regabiargs
    70  	MOVD	R26, R0
    71  	MOVD	R20, R1
    72  #else
    73  	MOVD	R26, 8(RSP)
    74  	MOVD	R20, 16(RSP)
    75  #endif
    76  	CALL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    77  	MOVD	32(RSP), R26
    78  	MOVD	R26, 8(RSP)
    79  	MOVD	$argframe+0(FP), R3
    80  	MOVD	R3, 16(RSP)
    81  	MOVB	$0, LOCAL_RETVALID(RSP)
    82  	ADD	$LOCAL_RETVALID, RSP, R3
    83  	MOVD	R3, 24(RSP)
    84  	ADD	$LOCAL_REGARGS, RSP, R3
    85  	MOVD	R3, 32(RSP)
    86  	CALL	·callMethod(SB)
    87  	ADD	$LOCAL_REGARGS, RSP, R20
    88  	CALL	runtime·unspillArgs(SB)
    89  	RET
    90
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