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syscall: support rawVforkSyscall on linux/riscv64

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Updates #31936

Change-Id: I7dcb8987d4c306ccc97704b9c1b12313ba8bf242
Reviewed-on: https://go-review.googlesource.com/c/go/+/234960
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-05-25 03:23:30 +10:00
parent cf9b4f63a5
commit d303630622
3 changed files with 28 additions and 4 deletions
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22
src/syscall/asm_linux_riscv64.s
View file

@ -104,6 +104,28 @@ err:
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

6
src/syscall/exec_linux.go
View file

@ -207,7 +207,11 @@ func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, att
}
}
hasRawVforkSyscall := runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64"
var hasRawVforkSyscall bool
switch runtime.GOARCH {
case "amd64", "arm64", "ppc64", "riscv64", "s390x":
hasRawVforkSyscall = true
}
// About to call fork.
// No more allocation or calls of non-assembly functions.

4
src/syscall/syscall_linux_riscv64.go
View file

@ -199,6 +199,4 @@ func Pause() error {
return err
}
func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno) {
panic("not implemented")
}
func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno)