On Sun, Oct 14, 2018 at 4:49 PM Michael Kerrisk (man-pages)
<mtk.manpages@xxxxxxxxx> wrote:
> You say here "every other ABI". Do you mean rather, every other *32-bit* ABI?
Nope every other ABI including 64-bit ones, one of the specifics of
these new p{read,write}v2 syscalls is that they usually take 64-bit
offset in a pair of registers in an attempt to avoid the whole
"passing a 64-bit value on 32-bit ABIs" conundrum, see[1][2][3][4].
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/read_write.c?h=v4.18#n1127
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/read_write.c?h=v4.18#n1051
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/entry/syscalls/syscall_64.tbl?h=v4.18#n387
[4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/entry/syscalls/syscall_64.tbl?h=v4.18#n387
--
Eugene Syromyatnikov
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