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asm_ppc64x.s
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// Copyright 2012 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.
//go:build ppc64 || ppc64le
#include "textflag.h"
#include "funcdata.h"
#include "asm_ppc64x.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 32+FIXED_FRAME
#define LOCAL_REGARGS 40+FIXED_FRAME
// The frame size of the functions below is
// 32 (args of callReflect) + 8 (bool + padding) + 296 (abi.RegArgs) = 336.
// 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),$336
NO_LOCAL_POINTERS
// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
ADD $LOCAL_REGARGS, R1, R20
CALL runtime·spillArgs(SB)
MOVD R11, FIXED_FRAME+32(R1) // save R11
MOVD R11, FIXED_FRAME+0(R1) // arg for moveMakeFuncArgPtrs
MOVD R20, FIXED_FRAME+8(R1) // arg for local args
CALL ·moveMakeFuncArgPtrs(SB)
MOVD FIXED_FRAME+32(R1), R11 // restore R11 ctxt
MOVD R11, FIXED_FRAME+0(R1) // ctxt (arg0)
MOVD $argframe+0(FP), R3 // save arg to callArg
MOVD R3, FIXED_FRAME+8(R1) // frame (arg1)
ADD $LOCAL_RETVALID, R1, R3 // addr of return flag
MOVB R0, (R3) // clear flag
MOVD R3, FIXED_FRAME+16(R1) // addr retvalid (arg2)
ADD $LOCAL_REGARGS, R1, R3
MOVD R3, FIXED_FRAME+24(R1) // abiregargs (arg3)
BL ·callReflect(SB)
ADD $LOCAL_REGARGS, R1, R20 // set address of spill area
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),$336
NO_LOCAL_POINTERS
// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
ADD $LOCAL_REGARGS, R1, R20
CALL runtime·spillArgs(SB)
MOVD R11, FIXED_FRAME+0(R1) // arg0 ctxt
MOVD R11, FIXED_FRAME+32(R1) // save for later
MOVD R20, FIXED_FRAME+8(R1) // arg1 abiregargs
CALL ·moveMakeFuncArgPtrs(SB)
MOVD FIXED_FRAME+32(R1), R11 // restore ctxt
MOVD R11, FIXED_FRAME+0(R1) // set as arg0
MOVD $argframe+0(FP), R3 // frame pointer
MOVD R3, FIXED_FRAME+8(R1) // set as arg1
ADD $LOCAL_RETVALID, R1, R3
MOVB $0, (R3) // clear ret flag
MOVD R3, FIXED_FRAME+16(R1) // addr of return flag
ADD $LOCAL_REGARGS, R1, R3 // addr of abiregargs
MOVD R3, FIXED_FRAME+24(R1) // set as arg3
BL ·callMethod(SB)
ADD $LOCAL_REGARGS, R1, R20
CALL runtime·unspillArgs(SB)
RET