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asm_riscv64.s
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
// The frames of each of the two functions below contain two locals, at offsets
// that are known to the runtime.
//
// The first local is a bool called retValid with a whole pointer-word reserved
// for it on the stack. The purpose of this word is so that the runtime knows
// whether the stack-allocated return space contains valid values for stack
// scanning.
//
// The second local is an abi.RegArgs value whose offset is also known to the
// runtime, so that a stack map for it can be constructed, since it contains
// pointers visible to the GC.
#define LOCAL_RETVALID 40
#define LOCAL_REGARGS 48
// The frame size of the functions below is
// 32 (args of callReflect/callMethod) + (8 bool with padding) + 392 (abi.RegArgs) = 432.
// makeFuncStub is the code half of the function returned by MakeFunc.
// See the comment on the declaration of makeFuncStub in makefunc.go
// for more details.
// No arg size here, runtime pulls arg map out of the func value.
TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432
NO_LOCAL_POINTERS
ADD $LOCAL_REGARGS, SP, X25 // spillArgs using X25
CALL runtime·spillArgs(SB)
MOV CTXT, 32(SP) // save CTXT > args of moveMakeFuncArgPtrs < LOCAL_REGARGS
MOV CTXT, 8(SP)
MOV X25, 16(SP)
CALL ·moveMakeFuncArgPtrs(SB)
MOV 32(SP), CTXT // restore CTXT
MOV CTXT, 8(SP)
MOV $argframe+0(FP), T0
MOV T0, 16(SP)
MOV ZERO, LOCAL_RETVALID(SP)
ADD $LOCAL_RETVALID, SP, T1
MOV T1, 24(SP)
ADD $LOCAL_REGARGS, SP, T1
MOV T1, 32(SP)
CALL ·callReflect(SB)
ADD $LOCAL_REGARGS, SP, X25 // unspillArgs using X25
CALL runtime·unspillArgs(SB)
RET
// methodValueCall is the code half of the function returned by makeMethodValue.
// See the comment on the declaration of methodValueCall in makefunc.go
// for more details.
// No arg size here; runtime pulls arg map out of the func value.
TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$432
NO_LOCAL_POINTERS
ADD $LOCAL_REGARGS, SP, X25 // spillArgs using X25
CALL runtime·spillArgs(SB)
MOV CTXT, 32(SP) // save CTXT
MOV CTXT, 8(SP)
MOV X25, 16(SP)
CALL ·moveMakeFuncArgPtrs(SB)
MOV 32(SP), CTXT // restore CTXT
MOV CTXT, 8(SP)
MOV $argframe+0(FP), T0
MOV T0, 16(SP)
MOV ZERO, LOCAL_RETVALID(SP)
ADD $LOCAL_RETVALID, SP, T1
MOV T1, 24(SP)
ADD $LOCAL_REGARGS, SP, T1
MOV T1, 32(SP) // frame size to 32+SP as callreflect args
CALL ·callMethod(SB)
ADD $LOCAL_REGARGS, SP, X25 // unspillArgs using X25
CALL runtime·unspillArgs(SB)
RET