github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/runtime/cgo/asm_mipsx.s (about)

     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  //go:build mips || mipsle
     6  
     7  #include "textflag.h"
     8  
     9  // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
    10  // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
    11  // Use a local trampoline, to avoid taking the address of a dynamically exported
    12  // function.
    13  TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
    14  	MOVW	_crosscall2_ptr(SB), R5
    15  	MOVW	$crosscall2_trampoline<>(SB), R6
    16  	MOVW	R6, (R5)
    17  	RET
    18  
    19  TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
    20  	JMP	crosscall2(SB)
    21  
    22  // Called by C code generated by cmd/cgo.
    23  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
    24  // Saves C callee-saved registers and calls cgocallback with three arguments.
    25  // fn is the PC of a func(a unsafe.Pointer) function.
    26  TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
    27  	/*
    28  	 * We still need to save all callee save register as before, and then
    29  	 *  push 3 args for fn (R4, R5, R7), skipping R6.
    30  	 * Also note that at procedure entry in gc world, 4(R29) will be the
    31  	 *  first arg.
    32  	 */
    33  
    34  	// Space for 9 caller-saved GPR + LR + 6 caller-saved FPR.
    35  	// O32 ABI allows us to smash 16 bytes argument area of caller frame.
    36  #ifndef GOMIPS_softfloat
    37  	SUBU	$(4*14+8*6-16), R29
    38  #else
    39  	SUBU	$(4*14-16), R29	// For soft-float, no FPR.
    40  #endif
    41  	MOVW	R4, (4*1)(R29)	// fn unsafe.Pointer
    42  	MOVW	R5, (4*2)(R29)	// a unsafe.Pointer
    43  	MOVW	R7, (4*3)(R29)	// ctxt uintptr
    44  	MOVW	R16, (4*4)(R29)
    45  	MOVW	R17, (4*5)(R29)
    46  	MOVW	R18, (4*6)(R29)
    47  	MOVW	R19, (4*7)(R29)
    48  	MOVW	R20, (4*8)(R29)
    49  	MOVW	R21, (4*9)(R29)
    50  	MOVW	R22, (4*10)(R29)
    51  	MOVW	R23, (4*11)(R29)
    52  	MOVW	g, (4*12)(R29)
    53  	MOVW	R31, (4*13)(R29)
    54  #ifndef GOMIPS_softfloat
    55  	MOVD	F20, (4*14)(R29)
    56  	MOVD	F22, (4*14+8*1)(R29)
    57  	MOVD	F24, (4*14+8*2)(R29)
    58  	MOVD	F26, (4*14+8*3)(R29)
    59  	MOVD	F28, (4*14+8*4)(R29)
    60  	MOVD	F30, (4*14+8*5)(R29)
    61  #endif
    62  	JAL	runtime·load_g(SB)
    63  
    64  	JAL	runtime·cgocallback(SB)
    65  
    66  	MOVW	(4*4)(R29), R16
    67  	MOVW	(4*5)(R29), R17
    68  	MOVW	(4*6)(R29), R18
    69  	MOVW	(4*7)(R29), R19
    70  	MOVW	(4*8)(R29), R20
    71  	MOVW	(4*9)(R29), R21
    72  	MOVW	(4*10)(R29), R22
    73  	MOVW	(4*11)(R29), R23
    74  	MOVW	(4*12)(R29), g
    75  	MOVW	(4*13)(R29), R31
    76  #ifndef GOMIPS_softfloat
    77  	MOVD	(4*14)(R29), F20
    78  	MOVD	(4*14+8*1)(R29), F22
    79  	MOVD	(4*14+8*2)(R29), F24
    80  	MOVD	(4*14+8*3)(R29), F26
    81  	MOVD	(4*14+8*4)(R29), F28
    82  	MOVD	(4*14+8*5)(R29), F30
    83  
    84  	ADDU	$(4*14+8*6-16), R29
    85  #else
    86  	ADDU	$(4*14-16), R29
    87  #endif
    88  	RET