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// Copyright 2022 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" // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr) // // We need to convert to the syscall ABI. // // arg | ABIInternal | Syscall // --------------------------- // num | R4 | R11 // a1 | R5 | R4 // a2 | R6 | R5 // a3 | R7 | R6 // a4 | R8 | R7 // a5 | R9 | R8 // a6 | R10 | R9 // // r1 | R4 | R4 // r2 | R5 | R5 // err | R6 | part of R4 TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0-80 #ifdef GOEXPERIMENT_regabiargs MOVV R4, R11 // syscall entry MOVV R5, R4 MOVV R6, R5 MOVV R7, R6 MOVV R8, R7 MOVV R9, R8 MOVV R10, R9 #else MOVV num+0(FP), R11 // syscall entry MOVV a1+8(FP), R4 MOVV a2+16(FP), R5 MOVV a3+24(FP), R6 MOVV a4+32(FP), R7 MOVV a5+40(FP), R8 MOVV a6+48(FP), R9 #endif SYSCALL #ifdef GOEXPERIMENT_regabiargs MOVV R0, R5 // r2 is not used. Always set to 0. MOVW $-4096, R12 BGEU R12, R4, ok SUBVU R4, R0, R6 // errno MOVV $-1, R4 // r1 #else MOVW $-4096, R12 BGEU R12, R4, ok MOVV $-1, R12 MOVV R12, r1+56(FP) MOVV R0, r2+64(FP) SUBVU R4, R0, R4 MOVV R4, errno+72(FP) #endif RET ok: #ifdef GOEXPERIMENT_regabiargs // r1 already in R4 MOVV R0, R6 // errno #else MOVV R4, r1+56(FP) MOVV R0, r2+64(FP) // r2 is not used. Always set to 0. MOVV R0, errno+72(FP) #endif RET