asm_loong64.s

Documentation: reflect

     1// Copyright 2022 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#define	REGCTXT	R29
     9
    10// The frames of each of the two functions below contain two locals, at offsets
    11// that are known to the runtime.
    12//
    13// The first local is a bool called retValid with a whole pointer-word reserved
    14// for it on the stack. The purpose of this word is so that the runtime knows
    15// whether the stack-allocated return space contains valid values for stack
    16// scanning.
    17//
    18// The second local is an abi.RegArgs value whose offset is also known to the
    19// runtime, so that a stack map for it can be constructed, since it contains
    20// pointers visible to the GC.
    21#define LOCAL_RETVALID 40
    22#define LOCAL_REGARGS 48
    23
    24// The frame size of the functions below is
    25// 32 (args of callReflect) + 8 (bool + padding) + 392 (abi.RegArgs) = 432.
    26
    27// makeFuncStub is the code half of the function returned by MakeFunc.
    28// See the comment on the declaration of makeFuncStub in makefunc.go
    29// for more details.
    30// No arg size here, runtime pulls arg map out of the func value.
    31TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432
    32	NO_LOCAL_POINTERS
    33	ADDV	$LOCAL_REGARGS, R3, R25 // spillArgs using R25
    34	JAL	runtime·spillArgs(SB)
    35	MOVV	REGCTXT, 32(R3) // save REGCTXT > args of moveMakeFuncArgPtrs < LOCAL_REGARGS
    36
    37	MOVV	REGCTXT, R4
    38	MOVV	R25, R5
    39	JAL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    40	MOVV	32(R3), REGCTXT // restore REGCTXT
    41
    42	MOVV	REGCTXT, 8(R3)
    43	MOVV	$argframe+0(FP), R20
    44	MOVV	R20, 16(R3)
    45	MOVV	R0, LOCAL_RETVALID(R3)
    46	ADDV	$LOCAL_RETVALID, R3, R20
    47	MOVV	R20, 24(R3)
    48	ADDV	$LOCAL_REGARGS, R3, R20
    49	MOVV	R20, 32(R3)
    50	JAL	·callReflect(SB)
    51	ADDV	$LOCAL_REGARGS, R3, R25	//unspillArgs using R25
    52	JAL	runtime·unspillArgs(SB)
    53	RET
    54
    55// methodValueCall is the code half of the function returned by makeMethodValue.
    56// See the comment on the declaration of methodValueCall in makefunc.go
    57// for more details.
    58// No arg size here; runtime pulls arg map out of the func value.
    59TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432
    60	NO_LOCAL_POINTERS
    61	ADDV	$LOCAL_REGARGS, R3, R25 // spillArgs using R25
    62	JAL	runtime·spillArgs(SB)
    63	MOVV	REGCTXT, 32(R3) // save REGCTXT > args of moveMakeFuncArgPtrs < LOCAL_REGARGS
    64	MOVV	REGCTXT, R4
    65	MOVV	R25, R5
    66	JAL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    67	MOVV	32(R3), REGCTXT // restore REGCTXT
    68	MOVV	REGCTXT, 8(R3)
    69	MOVV	$argframe+0(FP), R20
    70	MOVV	R20, 16(R3)
    71	MOVB	R0, LOCAL_RETVALID(R3)
    72	ADDV	$LOCAL_RETVALID, R3, R20
    73	MOVV	R20, 24(R3)
    74	ADDV	$LOCAL_REGARGS, R3, R20
    75	MOVV	R20, 32(R3) // frame size to 32+SP as callreflect args)
    76	JAL	·callMethod(SB)
    77	ADDV	$LOCAL_REGARGS, R3, R25 // unspillArgs using R25
    78	JAL	runtime·unspillArgs(SB)
    79	RET
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