diff options
Diffstat (limited to 'src/syscall/asm_linux_riscv64.s')
| -rw-r--r-- | src/syscall/asm_linux_riscv64.s | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_riscv64.s b/src/syscall/asm_linux_riscv64.s new file mode 100644 index 0000000..f172dd3 --- /dev/null +++ b/src/syscall/asm_linux_riscv64.s @@ -0,0 +1,137 @@ +// Copyright 2019 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" + +// +// System calls for riscv64, Linux +// + +// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64) +TEXT ·Syscall(SB),NOSPLIT,$0-56 + CALL runtime·entersyscall(SB) + MOV a1+8(FP), A0 + MOV a2+16(FP), A1 + MOV a3+24(FP), A2 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV $-4096, T0 + BLTU T0, A0, err + MOV A0, r1+32(FP) // r1 + MOV A1, r2+40(FP) // r2 + MOV ZERO, err+48(FP) // errno + CALL runtime·exitsyscall(SB) + RET +err: + MOV $-1, T0 + MOV T0, r1+32(FP) // r1 + MOV ZERO, r2+40(FP) // r2 + SUB A0, ZERO, A0 + MOV A0, err+48(FP) // errno + CALL runtime·exitsyscall(SB) + RET + +// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) +TEXT ·Syscall6(SB),NOSPLIT,$0-80 + CALL runtime·entersyscall(SB) + MOV a1+8(FP), A0 + MOV a2+16(FP), A1 + MOV a3+24(FP), A2 + MOV a4+32(FP), A3 + MOV a5+40(FP), A4 + MOV a6+48(FP), A5 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV $-4096, T0 + BLTU T0, A0, err + MOV A0, r1+56(FP) // r1 + MOV A1, r2+64(FP) // r2 + MOV ZERO, err+72(FP) // errno + CALL runtime·exitsyscall(SB) + RET +err: + MOV $-1, T0 + MOV T0, r1+56(FP) // r1 + MOV ZERO, r2+64(FP) // r2 + SUB A0, ZERO, A0 + MOV A0, err+72(FP) // errno + CALL runtime·exitsyscall(SB) + RET + +// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) +TEXT ·RawSyscall(SB),NOSPLIT,$0-56 + MOV a1+8(FP), A0 + MOV a2+16(FP), A1 + MOV a3+24(FP), A2 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV $-4096, T0 + BLTU T0, A0, err + MOV A0, r1+32(FP) // r1 + MOV A1, r2+40(FP) // r2 + MOV ZERO, err+48(FP) // errno + RET +err: + MOV $-1, T0 + MOV T0, r1+32(FP) // r1 + MOV ZERO, r2+40(FP) // r2 + SUB A0, ZERO, A0 + MOV A0, err+48(FP) // errno + RET + +// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) +TEXT ·RawSyscall6(SB),NOSPLIT,$0-80 + MOV a1+8(FP), A0 + MOV a2+16(FP), A1 + MOV a3+24(FP), A2 + MOV a4+32(FP), A3 + MOV a5+40(FP), A4 + MOV a6+48(FP), A5 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV $-4096, T0 + BLTU T0, A0, err + MOV A0, r1+56(FP) // r1 + MOV A1, r2+64(FP) // r2 + MOV ZERO, err+72(FP) // errno + RET +err: + MOV $-1, T0 + MOV T0, r1+56(FP) // r1 + MOV ZERO, r2+64(FP) // r2 + SUB A0, ZERO, A0 + MOV A0, err+72(FP) // errno + RET + +// func rawVforkSyscall(trap, a1 uintptr) (r1, err uintptr) +TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-32 + MOV a1+8(FP), A0 + MOV ZERO, A1 + MOV ZERO, A2 + MOV ZERO, A3 + MOV ZERO, A4 + MOV ZERO, A5 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV $-4096, T0 + BLTU T0, A0, err + MOV A0, r1+16(FP) // r1 + MOV ZERO, err+24(FP) // errno + RET +err: + MOV $-1, T0 + MOV T0, r1+16(FP) // r1 + SUB A0, ZERO, A0 + MOV A0, err+24(FP) // errno + RET + +TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48 + MOV a1+8(FP), A0 + MOV a2+16(FP), A1 + MOV a3+24(FP), A2 + MOV trap+0(FP), A7 // syscall entry + ECALL + MOV A0, r1+32(FP) + MOV A1, r2+40(FP) + RET |