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Re: [PATCH v2 02/16] Consolidate Linux msgctl implementation
On Wed, Nov 02, 2016 at 05:26:39PM -0200, Adhemerval Zanella wrote:
> Changes from previous version:
>
> - Use __ASSUME_SYSVIPC_SYSCALL instead of __NR_syscall to issue the
> wired syscall or the ipc one.
>
> --
>
> This patch consolidates the msgctl Linux implementation in only
> one default file, sysdeps/unix/sysv/linux/msgctl.c. If tries to use
> the direct syscall if it is supported, otherwise will use the old ipc
> multiplex mechanism.
>
> The patch also simplify header inclusion and reorganize internal
> compat symbol to be built only if old ipc is defined.
>
> Checked on x86_64, i686, powerpc64le, aarch64, and armhf.
>
> * sysdeps/unix/sysv/linux/alpha/msgctl.c: Remove file.
> * sysdeps/unix/sysv/linux/arm/msgctl.c: Likewise.
> * sysdeps/unix/sysv/linux/microblaze/msgctl.c: Likewise.
> * sysdeps/unix/sysv/linux/mips/mips64/msgctl.c: Use default
> implementation.
> * sysdeps/unix/sysv/linux/msgctl.c (__new_msgctl): Use msgctl syscall
> if defined.
> ---
> ChangeLog | 8 ++++++
> sysdeps/unix/sysv/linux/alpha/msgctl.c | 1 -
> sysdeps/unix/sysv/linux/arm/msgctl.c | 33 ----------------------
> sysdeps/unix/sysv/linux/microblaze/msgctl.c | 1 -
> sysdeps/unix/sysv/linux/mips/mips64/msgctl.c | 17 ++---------
> sysdeps/unix/sysv/linux/msgctl.c | 42 +++++++++++++---------------
> 6 files changed, 30 insertions(+), 72 deletions(-)
> delete mode 100644 sysdeps/unix/sysv/linux/alpha/msgctl.c
> delete mode 100644 sysdeps/unix/sysv/linux/arm/msgctl.c
> delete mode 100644 sysdeps/unix/sysv/linux/microblaze/msgctl.c
Hi Adhemerval,
I'm testing your series with aarch64/ilp32 + LTP, and see regressions:
msgctl01 FAIL 1
msgctl06 FAIL 1
msgsnd01 FAIL 1
semctl01 FAIL 1
semctl07 FAIL 1
semget01 FAIL 1
shmat01 FAIL 1
shmctl01 FAIL 1
shmget01 FAIL 1
Regarding msgctl. objdump for libc.so shows that syscall is generated
from stub in sysdeps/unix/sysv/linux/generic/syscalls.list.
000d0e80 <msgctl>:
#else
/* This is a "normal" system call stub: if there is an error,
it returns -1 and sets errno. */
T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
d0e80: d2801768 mov x8, #0xbb
// #187
d0e84: d4000001 svc #0x0
d0e88: b13ffc1f cmn x0, #0xfff
d0e8c: 54000042 b.cs d0e94
<msgctl+0x14>
ret
d0e90: d65f03c0 ret
T_PSEUDO_END (SYSCALL_SYMBOL)
d0e94: 17fd194b b
173c0 <__GI___syscall_error>
d0e98: d503201f nop
d0e9c: d503201f nop
For aarch64/ilp32 to drop custom implementation, we need
to force __IPC_64, and so remove stubs for msgctl, semctl and shmctl
to let glibc find proper implementation under sysv/linux.
The minimal fix for my regression is below. Though, I'm not sure that it's
complete, and that it will not affect other ports. BTW, grepping for
msgctl in syscalls.list files shows that they has outdated comment
which should be fixed in this series too - in arm, microblaze and mips64 ports.
# Semaphore and shm system calls. msgctl, shmctl, and semctl have C
# wrappers (to set __IPC_64).
Yury.
diff --git a/sysdeps/unix/sysv/linux/generic/syscalls.list b/sysdeps/unix/sysv/linux/generic/syscalls.list
index 5993ab4..459892d 100644
--- a/sysdeps/unix/sysv/linux/generic/syscalls.list
+++ b/sysdeps/unix/sysv/linux/generic/syscalls.list
@@ -2,15 +2,12 @@
# SysV APIs
msgget - msgget i:ii __msgget msgget
-msgctl - msgctl i:iip __msgctl msgctl
msgrcv - msgrcv Ci:ibnii __msgrcv msgrcv
msgsnd - msgsnd Ci:ibni __msgsnd msgsnd
semget - semget i:iii __semget semget
-semctl - semctl i:iiii __semctl semctl
semtimedop - semtimedop i:ipip semtimedop
semop - semop i:ipi __semop semop
shmget - shmget i:iii __shmget shmget
-shmctl - shmctl i:iip __shmctl shmctl
shmat - shmat i:ipi __shmat shmat
shmdt - shmdt i:s __shmdt shmdt