asm_s390x.s

Documentation: reflect

     1// Copyright 2016 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
    20#define LOCAL_RETVALID 40
    21#define LOCAL_REGARGS 48
    22
    23// The frame size of the functions below is
    24// 32 (args of callReflect/callMethod) + 8 (bool + padding) + 264 (abi.RegArgs) = 304.
    25
    26// makeFuncStub is the code half of the function returned by MakeFunc.
    27// See the comment on the declaration of makeFuncStub in makefunc.go
    28// for more details.
    29// No arg size here, runtime pulls arg map out of the func value.
    30TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$304
    31	NO_LOCAL_POINTERS
    32	ADD	$LOCAL_REGARGS, R15, R10 // spillArgs using R10
    33	BL	runtime·spillArgs(SB)
    34	MOVD	R12, 32(R15) // save context reg R12 > args of moveMakeFuncArgPtrs < LOCAL_REGARGS
    35#ifdef GOEXPERIMENT_regabiargs
    36	MOVD	R12, R2
    37	MOVD	R10, R3
    38#else
    39	MOVD	R12, 8(R15)
    40	MOVD	R10, 16(R15)
    41#endif
    42	BL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    43	MOVD	32(R15), R12 // restore context reg R12
    44	MOVD	R12, 8(R15)
    45	MOVD	$argframe+0(FP), R1
    46	MOVD	R1, 16(R15)
    47	MOVB	$0, LOCAL_RETVALID(R15)
    48	ADD	$LOCAL_RETVALID, R15, R1
    49	MOVD	R1, 24(R15)
    50	ADD	$LOCAL_REGARGS, R15, R1
    51	MOVD	R1, 32(R15)
    52	BL	·callReflect(SB)
    53	ADD	$LOCAL_REGARGS, R15, R10 // unspillArgs using R10
    54	BL	runtime·unspillArgs(SB)
    55	RET
    56
    57// methodValueCall is the code half of the function returned by makeMethodValue.
    58// See the comment on the declaration of methodValueCall in makefunc.go
    59// for more details.
    60// No arg size here; runtime pulls arg map out of the func value.
    61TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$304
    62	NO_LOCAL_POINTERS
    63	ADD	$LOCAL_REGARGS, R15, R10 // spillArgs using R10
    64	BL	runtime·spillArgs(SB)
    65	MOVD	R12, 32(R15) // save context reg R12 > args of moveMakeFuncArgPtrs < LOCAL_REGARGS
    66#ifdef GOEXPERIMENT_regabiargs
    67	MOVD	R12, R2
    68	MOVD	R10, R3
    69#else
    70	MOVD	R12, 8(R15)
    71	MOVD	R10, 16(R15)
    72#endif
    73	BL	·moveMakeFuncArgPtrs<ABIInternal>(SB)
    74	MOVD	32(R15), R12 // restore context reg R12
    75	MOVD	R12, 8(R15)
    76	MOVD	$argframe+0(FP), R1
    77	MOVD	R1, 16(R15)
    78	MOVB	$0, LOCAL_RETVALID(R15)
    79	ADD	$LOCAL_RETVALID, R15, R1
    80	MOVD	R1, 24(R15)
    81	ADD	$LOCAL_REGARGS, R15, R1
    82	MOVD	R1, 32(R15)
    83	BL	·callMethod(SB)
    84	ADD	$LOCAL_REGARGS, R15, R10 // unspillArgs using R10
    85	BL	runtime·unspillArgs(SB)
    86	RET
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