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unix: offs2lohi should shift by bits, not bytes

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Fixes golang/go#57291

Change-Id: I212ab8a9f47563d9c124a0f20c17df35d7aa8e6d
Reviewed-on: https://go-review.googlesource.com/c/sys/+/457315
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Eric Lagergren
2022-12-15 14:26:47 +00:00
committed by Gopher Robot
parent cffae8ece4
commit 72f772c4d7
2 changed files with 36 additions and 5 deletions
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unix/syscall_linux.go
+3 -5
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@@ -1986,12 +1986,10 @@ func bytes2iovec(bs [][]byte) []Iovec {
return iovecs
}
// offs2lohi splits offs into its lower and upper unsigned long. On 64-bit
// systems, hi will always be 0. On 32-bit systems, offs will be split in half.
// preadv/pwritev chose this calling convention so they don't need to add a
// padding-register for alignment on ARM.
// offs2lohi splits offs into its low and high order bits.
func offs2lohi(offs int64) (lo, hi uintptr) {
return uintptr(offs), uintptr(uint64(offs) >> SizeofLong)
const longBits = SizeofLong * 8
return uintptr(offs), uintptr(uint64(offs) >> longBits)
}
func Readv(fd int, iovs [][]byte) (n int, err error) {