Use shmat syscall for Linux implementation

This patch add a direct call to shmat syscall if it is supported by
kernel features.

Checked on x86_64, i686, powerpc64le, aarch64, and armhf.

	* sysdeps/unix/sysv/linux/alpha/syscalls.list (shmat): Remove.
	* sysdeps/unix/sysv/linux/arm/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/generic/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/hppa/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/ia64/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/microblaze/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/syscalls.list (shmat):
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list (shmat):
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/syscalls.list (shmat): Likewise.
	* sysdeps/unix/sysv/linux/alpha/kernel-features.h (__NR_shmat):
	Define to __NR_osf_shmat.
	* sysdeps/unix/sysv/linux/shmat.c (shmat): Use shmat syscall if it is
	defined.

11 files changed, 15 insertions, 22 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/kernel-features.h b/sysdeps/unix/sysv/linux/alpha/kernel-features.h
index f09222d..2fc3b77 100644
--- a/sysdeps/unix/sysv/linux/alpha/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/alpha/kernel-features.h
@@ -29,4 +29,7 @@
 #undef __ASSUME_STATFS64
 #define __ASSUME_STATFS64 0
 
+/* Alpha defines SysV ipc shmat syscall with a different name.  */
+#define __NR_shmat __NR_osf_shmat
+
 #endif /* _KERNEL_FEATURES_H */
diff --git a/sysdeps/unix/sysv/linux/alpha/syscalls.list b/sysdeps/unix/sysv/linux/alpha/syscalls.list
index 8d3a042..9948d2d 100644
--- a/sysdeps/unix/sysv/linux/alpha/syscalls.list
+++ b/sysdeps/unix/sysv/linux/alpha/syscalls.list
@@ -1,6 +1,5 @@
 # File name	Caller	Syscall name	# args	Strong name	Weak names
 
-shmat		-	osf_shmat	i:ipi	__shmat		shmat
 oldshmctl	EXTRA	shmctl		i:iip	__old_shmctl	shmctl@GLIBC_2.0
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget
diff --git a/sysdeps/unix/sysv/linux/arm/syscalls.list b/sysdeps/unix/sysv/linux/arm/syscalls.list
index 1b2de93..f50a5cf 100644
--- a/sysdeps/unix/sysv/linux/arm/syscalls.list
+++ b/sysdeps/unix/sysv/linux/arm/syscalls.list
@@ -23,7 +23,6 @@ personality	EXTRA	personality	Ei:i	__personality	personality
 
 # Semaphore and shm system calls.  msgctl, shmctl, and semctl have C
 # wrappers (to set __IPC_64).
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget
 
diff --git a/sysdeps/unix/sysv/linux/generic/syscalls.list b/sysdeps/unix/sysv/linux/generic/syscalls.list
index e12fb3e..0df73a9 100644
--- a/sysdeps/unix/sysv/linux/generic/syscalls.list
+++ b/sysdeps/unix/sysv/linux/generic/syscalls.list
@@ -3,7 +3,6 @@
 # SysV APIs
 shmget		-	shmget		i:iii	__shmget	shmget
 shmctl		-	shmctl		i:iip	__shmctl	shmctl
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 
 # Socket APIs
diff --git a/sysdeps/unix/sysv/linux/hppa/syscalls.list b/sysdeps/unix/sysv/linux/hppa/syscalls.list
index a8fbc44..f757f02 100644
--- a/sysdeps/unix/sysv/linux/hppa/syscalls.list
+++ b/sysdeps/unix/sysv/linux/hppa/syscalls.list
@@ -1,7 +1,6 @@
 # File name	Caller	Syscall name	# args	Strong name	Weak names
 
 # semaphore and shm system calls
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmctl		-	shmctl		i:iip	__shmctl	shmctl
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget
diff --git a/sysdeps/unix/sysv/linux/ia64/syscalls.list b/sysdeps/unix/sysv/linux/ia64/syscalls.list
index eda4e4e..b0a3a44 100644
--- a/sysdeps/unix/sysv/linux/ia64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/ia64/syscalls.list
@@ -5,7 +5,6 @@ umount2		-	umount		2	__umount2	umount2
 getpriority	-	getpriority	i:ii	__getpriority	getpriority
 
 # semaphore and shm system calls
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmctl		-	shmctl		i:iip	__shmctl	shmctl
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget
diff --git a/sysdeps/unix/sysv/linux/microblaze/syscalls.list b/sysdeps/unix/sysv/linux/microblaze/syscalls.list
index d9afda0..8b844f2 100644
--- a/sysdeps/unix/sysv/linux/microblaze/syscalls.list
+++ b/sysdeps/unix/sysv/linux/microblaze/syscalls.list
@@ -8,6 +8,5 @@ personality	EXTRA	personality	Ei:i	__personality	personality
 
 # Semaphore and shm system calls.  msgctl, shmctl, and semctl have C
 # wrappers (to set __IPC_64).
-shmat           -       shmat           i:ipi   __shmat         shmat
 shmdt           -       shmdt           i:s     __shmdt         shmdt
 shmget          -       shmget          i:iii   __shmget        shmget
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/syscalls.list b/sysdeps/unix/sysv/linux/mips/mips64/syscalls.list
index 9cbbd38..e93c87a 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/mips/mips64/syscalls.list
@@ -2,6 +2,5 @@
 
 # Semaphore and shm system calls.  msgctl, shmctl, and semctl have C
 # wrappers (to set __IPC_64).
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list b/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
index 924d182..40ed7c5 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
@@ -1,7 +1,6 @@
-# File name	Caller	Syscall name	# args	Strong name	Weak names
+# File name     Caller  Syscall name    # args  Strong name     Weak names
 
 # semaphore and shm system calls
-shmat		-	shmat		i:ipi	__shmat		shmat
-shmctl		-	shmctl		i:iip	__shmctl	shmctl
-shmdt		-	shmdt		i:s	__shmdt		shmdt
-shmget		-	shmget		i:iii	__shmget	shmget
+shmctl          -       shmctl          i:iip   __shmctl        shmctl
+shmdt           -       shmdt           i:s     __shmdt         shmdt
+shmget          -       shmget          i:iii   __shmget        shmget
diff --git a/sysdeps/unix/sysv/linux/shmat.c b/sysdeps/unix/sysv/linux/shmat.c
index 5afc93c..d1ef323 100644
--- a/sysdeps/unix/sysv/linux/shmat.c
+++ b/sysdeps/unix/sysv/linux/shmat.c
@@ -16,13 +16,10 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <sys/shm.h>
+#include <sys/msg.h>
 #include <ipc_priv.h>
-
 #include <sysdep.h>
-#include <unistd.h>
-#include <sys/syscall.h>
+#include <errno.h>
 
 /* Attach the shared memory segment associated with SHMID to the data
    segment of the calling process.  SHMADDR and SHMFLG determine how
@@ -31,17 +28,19 @@
 void *
 shmat (int shmid, const void *shmaddr, int shmflg)
 {
+#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
+  return (void*) INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);
+#else
   INTERNAL_SYSCALL_DECL(err);
   unsigned long resultvar;
   void *raddr;
 
-  resultvar = INTERNAL_SYSCALL (ipc, err, 5, IPCOP_shmat,
-				shmid, shmflg,
-				(long int) &raddr,
-				(void *) shmaddr);
+  resultvar = INTERNAL_SYSCALL_CALL (ipc, err, IPCOP_shmat, shmid, shmflg,
+				     &raddr, shmaddr);
   if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))
     return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (resultvar,
 									       err));
 
   return raddr;
+#endif
 }
diff --git a/sysdeps/unix/sysv/linux/x86_64/syscalls.list b/sysdeps/unix/sysv/linux/x86_64/syscalls.list
index 573ed07..8712bb8 100644
--- a/sysdeps/unix/sysv/linux/x86_64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/x86_64/syscalls.list
@@ -6,7 +6,6 @@ pread64		-	pread64		Ci:ipii	__libc_pread	__libc_pread64 __pread64 pread64 __prea
 preadv64	-	preadv		Ci:ipii	preadv64	preadv
 pwrite64	-	pwrite64	Ci:ipii	__libc_pwrite	__libc_pwrite64 __pwrite64 pwrite64 __pwrite pwrite
 pwritev64	-	pwritev		Ci:ipii	pwritev64	pwritev
-shmat		-	shmat		i:ipi	__shmat		shmat
 shmctl		-	shmctl		i:iip	__shmctl	shmctl
 shmdt		-	shmdt		i:s	__shmdt		shmdt
 shmget		-	shmget		i:iii	__shmget	shmget