| // 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 | |
| MOVV R4, R11 // syscall entry | |
| MOVV R5, R4 | |
| MOVV R6, R5 | |
| MOVV R7, R6 | |
| MOVV R8, R7 | |
| MOVV R9, R8 | |
| MOVV R10, R9 | |
| SYSCALL | |
| 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 | |
| RET | |
| ok: | |
| // r1 already in R4 | |
| MOVV R0, R6 // errno | |
| RET | |