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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 07:21:44 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 07:21:57 -0700 |
| commit | d8a7d10324d9765fa62f42c1d94c5bf36b60d558 (patch) | |
| tree | b5b327952195b4aafa8a96a8a3fc83dbe4432333 /sysdeps/unix | |
| parent | c4c96f92f76dbc03a04a0e5005bf0be6f8dd4138 (diff) | |
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x86-64: Update LO_HI_LONG for p{readv,writev}{64}v2
The kernel interface for p{readv,writev}{64}v is
(unsigned long fd, {const }struct iovec *iov, unsigned long vlen,
unsigned long pos_l, unsigned long pos_h)
Except for targets which define __ARCH_WANT_COMPAT_SYS_PREADV64 and
__ARCH_WANT_COMPAT_SYS_PWRITEV64,
(unsigned long fd, {const }struct iovec *iov, unsigned long vlen,
off64_t pos)
is used for p{readv,writev}{64}v. X32 is the only such target. The
LO_HI_LONG macro is used to pass offset to the pos_l and pos_h pair.
Since pos_h is ignored when size of offset == sizeof of pos_l, x86-64
has
#define LO_HI_LONG(val) (val)
But the kernel interface for p{readv,writev}{64}v2 is
(unsigned long fd, {const }struct iovec *iov, unsigned long vlen,
unsigned long pos_l, unsigned long pos_h, int flags)
Except for targets which define __ARCH_WANT_COMPAT_SYS_PREADV64V2 and
__ARCH_WANT_COMPAT_SYS_PWRITEV64V2,
(unsigned long fd, {const }struct iovec *iov, unsigned long vlen,
off64_t pos, int flags)
is used for p{readv,writev}{64}v2. X32 is the only such target. Update
x86-64 LO_HI_LONG to pass 0 as the high part of the offset argument for
p{readv,writev}{64}v2 and define a different LO_HI_LONG for x32 to only
pass one argument for offset.
Tested on x32 and x86-64.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h (LO_HI_LONG): Pass
0 as the high part of offset.
* sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h (LO_HI_LONG): New.
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sysdep.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h index 7b8bd795b7..880e496880 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h +++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h @@ -387,6 +387,6 @@ /* How to pass the off{64}_t argument on p{readv,writev}{64}. */ #undef LO_HI_LONG -#define LO_HI_LONG(val) (val) +#define LO_HI_LONG(val) (val), 0 #endif /* linux/x86_64/sysdep.h */ diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h index f90fcfaeef..04c73a2bc1 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h +++ b/sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h @@ -22,4 +22,8 @@ #include <sysdeps/unix/sysv/linux/x86_64/sysdep.h> #include <sysdeps/x86_64/x32/sysdep.h> +/* How to pass the off{64}_t argument on p{readv,writev}{64}. */ +#undef LO_HI_LONG +#define LO_HI_LONG(val) (val) + #endif /* linux/x86_64/x32/sysdep.h */ |