github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/internal/runtime/syscall/asm_linux_loong64.s (about)

     1  // Copyright 2022 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  
     7  // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
     8  //
     9  // We need to convert to the syscall ABI.
    10  //
    11  // arg | ABIInternal | Syscall
    12  // ---------------------------
    13  // num | R4          | R11
    14  // a1  | R5          | R4
    15  // a2  | R6          | R5
    16  // a3  | R7          | R6
    17  // a4  | R8          | R7
    18  // a5  | R9          | R8
    19  // a6  | R10         | R9
    20  //
    21  // r1  | R4          | R4
    22  // r2  | R5          | R5
    23  // err | R6          | part of R4
    24  TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0-80
    25  #ifdef GOEXPERIMENT_regabiargs
    26  	MOVV	R4, R11  // syscall entry
    27  	MOVV	R5, R4
    28  	MOVV	R6, R5
    29  	MOVV	R7, R6
    30  	MOVV	R8, R7
    31  	MOVV	R9, R8
    32  	MOVV	R10, R9
    33  #else
    34  	MOVV	num+0(FP), R11  // syscall entry
    35  	MOVV	a1+8(FP), R4
    36  	MOVV	a2+16(FP), R5
    37  	MOVV	a3+24(FP), R6
    38  	MOVV	a4+32(FP), R7
    39  	MOVV	a5+40(FP), R8
    40  	MOVV	a6+48(FP), R9
    41  #endif
    42  	SYSCALL
    43  #ifdef GOEXPERIMENT_regabiargs
    44  	MOVV	R0, R5      // r2 is not used. Always set to 0.
    45  	MOVW	$-4096, R12
    46  	BGEU	R12, R4, ok
    47  	SUBVU	R4, R0, R6  // errno
    48  	MOVV	$-1, R4     // r1
    49  #else
    50  	MOVW	$-4096, R12
    51  	BGEU	R12, R4, ok
    52  	MOVV	$-1, R12
    53  	MOVV	R12, r1+56(FP)
    54  	MOVV	R0, r2+64(FP)
    55  	SUBVU	R4, R0, R4
    56  	MOVV	R4, errno+72(FP)
    57  #endif
    58  	RET
    59  ok:
    60  #ifdef GOEXPERIMENT_regabiargs
    61  	// r1 already in R4
    62  	MOVV	R0, R6     // errno
    63  #else
    64  	MOVV	R4, r1+56(FP)
    65  	MOVV	R0, r2+64(FP)	// r2 is not used. Always set to 0.
    66  	MOVV	R0, errno+72(FP)
    67  #endif
    68  	RET