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asm_mips64x.s
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// Copyright 2016 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 mips64 || mips64le
#include "textflag.h"
// Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
// It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
// Use a local trampoline, to avoid taking the address of a dynamically exported
// function.
TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
MOVV _crosscall2_ptr(SB), R5
MOVV $crosscall2_trampoline<>(SB), R6
MOVV R6, (R5)
RET
TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
JMP crosscall2(SB)
// Called by C code generated by cmd/cgo.
// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
// Saves C callee-saved registers and calls cgocallback with three arguments.
// fn is the PC of a func(a unsafe.Pointer) function.
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
/*
* We still need to save all callee save register as before, and then
* push 3 args for fn (R4, R5, R7), skipping R6.
* Also note that at procedure entry in gc world, 8(R29) will be the
* first arg.
*/
#ifndef GOMIPS64_softfloat
ADDV $(-8*23), R29
#else
ADDV $(-8*15), R29
#endif
MOVV R4, (8*1)(R29) // fn unsafe.Pointer
MOVV R5, (8*2)(R29) // a unsafe.Pointer
MOVV R7, (8*3)(R29) // ctxt uintptr
MOVV R16, (8*4)(R29)
MOVV R17, (8*5)(R29)
MOVV R18, (8*6)(R29)
MOVV R19, (8*7)(R29)
MOVV R20, (8*8)(R29)
MOVV R21, (8*9)(R29)
MOVV R22, (8*10)(R29)
MOVV R23, (8*11)(R29)
MOVV RSB, (8*12)(R29)
MOVV g, (8*13)(R29)
MOVV R31, (8*14)(R29)
#ifndef GOMIPS64_softfloat
MOVD F24, (8*15)(R29)
MOVD F25, (8*16)(R29)
MOVD F26, (8*17)(R29)
MOVD F27, (8*18)(R29)
MOVD F28, (8*19)(R29)
MOVD F29, (8*20)(R29)
MOVD F30, (8*21)(R29)
MOVD F31, (8*22)(R29)
#endif
// Initialize Go ABI environment
// prepare SB register = PC & 0xffffffff00000000
BGEZAL R0, 1(PC)
SRLV $32, R31, RSB
SLLV $32, RSB
JAL runtime·load_g(SB)
JAL runtime·cgocallback(SB)
MOVV (8*4)(R29), R16
MOVV (8*5)(R29), R17
MOVV (8*6)(R29), R18
MOVV (8*7)(R29), R19
MOVV (8*8)(R29), R20
MOVV (8*9)(R29), R21
MOVV (8*10)(R29), R22
MOVV (8*11)(R29), R23
MOVV (8*12)(R29), RSB
MOVV (8*13)(R29), g
MOVV (8*14)(R29), R31
#ifndef GOMIPS64_softfloat
MOVD (8*15)(R29), F24
MOVD (8*16)(R29), F25
MOVD (8*17)(R29), F26
MOVD (8*18)(R29), F27
MOVD (8*19)(R29), F28
MOVD (8*20)(R29), F29
MOVD (8*21)(R29), F30
MOVD (8*22)(R29), F31
ADDV $(8*23), R29
#else
ADDV $(8*15), R29
#endif
RET