diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/posix/preadv.c | 108 | ||||
| -rw-r--r-- | sysdeps/posix/preadv64.c | 9 | ||||
| -rw-r--r-- | sysdeps/posix/pwritev.c | 108 | ||||
| -rw-r--r-- | sysdeps/posix/pwritev64.c | 9 | ||||
| -rw-r--r-- | sysdeps/posix/readv.c | 40 | ||||
| -rw-r--r-- | sysdeps/posix/writev.c | 42 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/bits/socket.h | 12 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 14 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/preadv.c | 88 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/preadv64.c | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/pwritev.c | 88 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/pwritev64.c | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/readv.c | 46 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/sys/eventfd.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/wordsize-64/preadv64.c | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/writev.c | 45 | ||||
| -rw-r--r-- | sysdeps/x86_64/strchr.S | 313 | ||||
| -rw-r--r-- | sysdeps/x86_64/strlen.S | 146 |
19 files changed, 608 insertions, 476 deletions
diff --git a/sysdeps/posix/preadv.c b/sysdeps/posix/preadv.c new file mode 100644 index 0000000000..e697604c19 --- /dev/null +++ b/sysdeps/posix/preadv.c @@ -0,0 +1,108 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <limits.h> +#include <stdbool.h> +#include <sys/param.h> +#if __WORDSIZE == 64 && !defined PREADV +/* Hide the preadv64 declaration. */ +# define preadv64 __redirect_preadv64 +#endif +#include <sys/uio.h> +#include <bits/wordsize.h> + +#ifndef PREADV +# define PREADV preadv +# define PREAD __pread +# define OFF_T off_t +#endif + + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + + +/* Read data from file descriptor FD at the given position OFFSET + without change the file pointer, and put the result in the buffers + described by VECTOR, which is a vector of COUNT 'struct iovec's. + The buffers are filled in the order specified. Operates just like + 'read' (see <unistd.h>) except that data are put in VECTOR instead + of a contiguous buffer. */ +ssize_t +PREADV (int fd, const struct iovec *vector, int count, OFF_T offset) +{ + /* Find the total number of bytes to be read. */ + size_t bytes = 0; + for (int i = 0; i < count; ++i) + { + /* Check for ssize_t overflow. */ + if (SSIZE_MAX - bytes < vector[i].iov_len) + { + __set_errno (EINVAL); + return -1; + } + bytes += vector[i].iov_len; + } + + /* Allocate a temporary buffer to hold the data. We should normally + use alloca since it's faster and does not require synchronization + with other threads. But we cannot if the amount of memory + required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; + if (__libc_use_alloca (bytes)) + buffer = (char *) __alloca (bytes); + else + { + malloced_buffer = buffer = (char *) malloc (bytes); + if (buffer == NULL) + return -1; + } + + /* Read the data. */ + ssize_t bytes_read = PREAD (fd, buffer, bytes, offset); + if (bytes_read <= 0) + return -1; + + /* Copy the data from BUFFER into the memory specified by VECTOR. */ + bytes = bytes_read; + for (int i = 0; i < count; ++i) + { + size_t copy = MIN (vector[i].iov_len, bytes); + + (void) memcpy ((void *) vector[i].iov_base, (void *) buffer, copy); + + buffer += copy; + bytes -= copy; + if (bytes == 0) + break; + } + + return bytes_read; +} +#if __WORDSIZE == 64 && defined preadv64 +# undef preadv64 +strong_alias (preadv, preadv64) +#endif diff --git a/sysdeps/posix/preadv64.c b/sysdeps/posix/preadv64.c new file mode 100644 index 0000000000..198622353a --- /dev/null +++ b/sysdeps/posix/preadv64.c @@ -0,0 +1,9 @@ +#include <bits/wordsize.h> + +#if __WORDSIZE == 32 +# define PREADV preadv64 +# define PREAD __pread64 +# define OFF_T off64_t + +# include "preadv.c" +#endif diff --git a/sysdeps/posix/pwritev.c b/sysdeps/posix/pwritev.c new file mode 100644 index 0000000000..0b6627dc9d --- /dev/null +++ b/sysdeps/posix/pwritev.c @@ -0,0 +1,108 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <limits.h> +#include <stdbool.h> +#include <sys/param.h> +#if __WORDSIZE == 64 && !defined PWRITEV +/* Hide the pwritev64 declaration. */ +# define pwritev64 __redirect_pwritev64 +#endif +#include <sys/uio.h> +#include <bits/wordsize.h> + +#ifndef PWRITEV +# define PWRITEV pwritev +# define PWRITE __pwrite +# define OFF_T off_t +#endif + + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + + +/* Read data from file descriptor FD at the given position OFFSET + without change the file pointer, and put the result in the buffers + described by VECTOR, which is a vector of COUNT 'struct iovec's. + The buffers are filled in the order specified. Operates just like + 'read' (see <unistd.h>) except that data are put in VECTOR instead + of a contiguous buffer. */ +ssize_t +PWRITEV (int fd, const struct iovec *vector, int count, OFF_T offset) +{ + /* Find the total number of bytes to be read. */ + size_t bytes = 0; + for (int i = 0; i < count; ++i) + { + /* Check for ssize_t overflow. */ + if (SSIZE_MAX - bytes < vector[i].iov_len) + { + __set_errno (EINVAL); + return -1; + } + bytes += vector[i].iov_len; + } + + /* Allocate a temporary buffer to hold the data. We should normally + use alloca since it's faster and does not require synchronization + with other threads. But we cannot if the amount of memory + required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; + if (__libc_use_alloca (bytes)) + buffer = (char *) __alloca (bytes); + else + { + malloced_buffer = buffer = (char *) malloc (bytes); + if (buffer == NULL) + return -1; + } + + /* Read the data. */ + ssize_t bytes_read = PWRITE (fd, buffer, bytes, offset); + if (bytes_read <= 0) + return -1; + + /* Copy the data from BUFFER into the memory specified by VECTOR. */ + bytes = bytes_read; + for (int i = 0; i < count; ++i) + { + size_t copy = MIN (vector[i].iov_len, bytes); + + (void) memcpy ((void *) vector[i].iov_base, (void *) buffer, copy); + + buffer += copy; + bytes -= copy; + if (bytes == 0) + break; + } + + return bytes_read; +} +#if __WORDSIZE == 64 && defined pwritev64 +# undef pwritev64 +strong_alias (pwritev, pwritev64) +#endif diff --git a/sysdeps/posix/pwritev64.c b/sysdeps/posix/pwritev64.c new file mode 100644 index 0000000000..4948d2efee --- /dev/null +++ b/sysdeps/posix/pwritev64.c @@ -0,0 +1,9 @@ +#include <bits/wordsize.h> + +#if __WORDSIZE == 32 +# define PWRITEV pwritev64 +# define PWRITE __pwrite64 +# define OFF_T off64_t + +# include "pwritev.c" +#endif diff --git a/sysdeps/posix/readv.c b/sysdeps/posix/readv.c index f0e78e6662..50bcc91315 100644 --- a/sysdeps/posix/readv.c +++ b/sysdeps/posix/readv.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1992, 1996, 1997, 2002 Free Software Foundation, Inc. +/* Copyright (C) 1991,1992,1996,1997,2002,2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,24 +25,24 @@ #include <sys/uio.h> #include <errno.h> + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + /* Read data from file descriptor FD, and put the result in the - buffers described by VECTOR, which is a vector of COUNT `struct iovec's. + buffers described by VECTOR, which is a vector of COUNT 'struct iovec's. The buffers are filled in the order specified. - Operates just like `read' (see <unistd.h>) except that data are + Operates just like 'read' (see <unistd.h>) except that data are put in VECTOR instead of a contiguous buffer. */ ssize_t __libc_readv (int fd, const struct iovec *vector, int count) { - char *buffer; - char *buffer_start; - size_t bytes; - ssize_t bytes_read; - int i; - bool use_malloc = false; - /* Find the total number of bytes to be read. */ - bytes = 0; - for (i = 0; i < count; ++i) + size_t bytes = 0; + for (int i = 0; i < count; ++i) { /* Check for ssize_t overflow. */ if (SSIZE_MAX - bytes < vector[i].iov_len) @@ -57,28 +57,25 @@ __libc_readv (int fd, const struct iovec *vector, int count) use alloca since it's faster and does not require synchronization with other threads. But we cannot if the amount of memory required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; if (__libc_use_alloca (bytes)) buffer = (char *) __alloca (bytes); else { - buffer = (char *) malloc (bytes); + malloced_buffer = buffer = (char *) malloc (bytes); if (buffer == NULL) - /* XXX I don't know whether it is acceptable to try reading - the data in chunks. Probably not so we just fail here. */ return -1; - - use_malloc = true; } /* Read the data. */ - bytes_read = __read (fd, buffer, bytes); + ssize_t bytes_read = __read (fd, buffer, bytes); if (bytes_read <= 0) return -1; /* Copy the data from BUFFER into the memory specified by VECTOR. */ bytes = bytes_read; - buffer_start = buffer; - for (i = 0; i < count; ++i) + for (int i = 0; i < count; ++i) { size_t copy = MIN (vector[i].iov_len, bytes); @@ -90,9 +87,6 @@ __libc_readv (int fd, const struct iovec *vector, int count) break; } - if (use_malloc) - free (buffer_start); - return bytes_read; } #ifndef __libc_readv diff --git a/sysdeps/posix/writev.c b/sysdeps/posix/writev.c index a347cc2eac..203cf9cebd 100644 --- a/sysdeps/posix/writev.c +++ b/sysdeps/posix/writev.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1992, 1996, 1997, 2002 Free Software Foundation, Inc. +/* Copyright (C) 1991,1992,1996,1997,2002,2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,24 +25,25 @@ #include <sys/uio.h> #include <errno.h> + +static void +ifree (char **ptrp) +{ + free (*ptrp); +} + + /* Write data pointed by the buffers described by VECTOR, which - is a vector of COUNT `struct iovec's, to file descriptor FD. + is a vector of COUNT 'struct iovec's, to file descriptor FD. The data is written in the order specified. - Operates just like `write' (see <unistd.h>) except that the data + Operates just like 'write' (see <unistd.h>) except that the data are taken from VECTOR instead of a contiguous buffer. */ ssize_t __libc_writev (int fd, const struct iovec *vector, int count) { - char *buffer; - register char *bp; - size_t bytes, to_copy; - ssize_t bytes_written; - int i; - bool use_malloc = false; - /* Find the total number of bytes to be written. */ - bytes = 0; - for (i = 0; i < count; ++i) + size_t bytes = 0; + for (int i = 0; i < count; ++i) { /* Check for ssize_t overflow. */ if (SSIZE_MAX - bytes < vector[i].iov_len) @@ -57,23 +58,23 @@ __libc_writev (int fd, const struct iovec *vector, int count) use alloca since it's faster and does not require synchronization with other threads. But we cannot if the amount of memory required is too large. */ + char *buffer; + char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL; if (__libc_use_alloca (bytes)) buffer = (char *) __alloca (bytes); else { - buffer = (char *) malloc (bytes); + malloced_buffer = buffer = (char *) malloc (bytes); if (buffer == NULL) /* XXX I don't know whether it is acceptable to try writing the data in chunks. Probably not so we just fail here. */ return -1; - - use_malloc = true; } /* Copy the data into BUFFER. */ - to_copy = bytes; - bp = buffer; - for (i = 0; i < count; ++i) + size_t to_copy = bytes; + char *bp = buffer; + for (int i = 0; i < count; ++i) { size_t copy = MIN (vector[i].iov_len, to_copy); @@ -84,10 +85,7 @@ __libc_writev (int fd, const struct iovec *vector, int count) break; } - bytes_written = __write (fd, buffer, bytes); - - if (use_malloc) - free (buffer); + ssize_t bytes_written = __write (fd, buffer, bytes); return bytes_written; } diff --git a/sysdeps/unix/sysv/linux/bits/socket.h b/sysdeps/unix/sysv/linux/bits/socket.h index 72c7335ae5..88062e59ad 100644 --- a/sysdeps/unix/sysv/linux/bits/socket.h +++ b/sysdeps/unix/sysv/linux/bits/socket.h @@ -95,15 +95,20 @@ enum __socket_type #define PF_ASH 18 /* Ash. */ #define PF_ECONET 19 /* Acorn Econet. */ #define PF_ATMSVC 20 /* ATM SVCs. */ +#define PF_RDS 21 /* RDS sockets. */ #define PF_SNA 22 /* Linux SNA Project */ #define PF_IRDA 23 /* IRDA sockets. */ #define PF_PPPOX 24 /* PPPoX sockets. */ #define PF_WANPIPE 25 /* Wanpipe API sockets. */ +#define PF_LLC 26 /* Linux LLC. */ +#define PF_CAN 29 /* Controller Area Network. */ +#define PF_TIPC 30 /* TIPC sockets. */ #define PF_BLUETOOTH 31 /* Bluetooth sockets. */ #define PF_IUCV 32 /* IUCV sockets. */ #define PF_RXRPC 33 /* RxRPC sockets. */ #define PF_ISDN 34 /* mISDN sockets. */ -#define PF_MAX 35 /* For now.. */ +#define PF_PHONET 35 /* Phonet sockets. */ +#define PF_MAX 36 /* For now.. */ /* Address families. */ #define AF_UNSPEC PF_UNSPEC @@ -130,14 +135,19 @@ enum __socket_type #define AF_ASH PF_ASH #define AF_ECONET PF_ECONET #define AF_ATMSVC PF_ATMSVC +#define AF_RDS PF_RDS #define AF_SNA PF_SNA #define AF_IRDA PF_IRDA #define AF_PPPOX PF_PPPOX #define AF_WANPIPE PF_WANPIPE +#define AF_LLC PF_LLC +#define AF_CAN PF_CAN +#define AF_TIPC PF_TIPC #define AF_BLUETOOTH PF_BLUETOOTH #define AF_IUCV PF_IUCV #define AF_RXRPC PF_RXRPC #define AF_ISDN PF_ISDN +#define AF_PHONET PF_PHONET #define AF_MAX PF_MAX /* Socket level values. Others are defined in the appropriate headers. diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index 29afe27711..a640765b5c 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -462,6 +462,13 @@ # define __ASSUME_SET_ROBUST_LIST 1 #endif +/* Pessimistically assume that 2.6.18 introduced real handling of + large numbers of requests to readv and writev and that we don't + need a fallback. It likely worked for much longer. */ +#if __LINUX_KERNEL_VERSION >= 0x020612 +# define __ASSUME_COMPLETE_READV_WRITEV 1 +#endif + /* Support for PI futexes was added in 2.6.18. */ #if __LINUX_KERNEL_VERSION >= 0x020612 # define __ASSUME_FUTEX_LOCK_PI 1 @@ -522,3 +529,10 @@ #if __LINUX_KERNEL_VERSION >= 0x02061d # define __ASSUME_FUTEX_CLOCK_REALTIME 1 #endif + +/* Support for preadv and pwritev was added in 2.6.30. */ +#if __LINUX_KERNEL_VERSION >= 0x02061e \ + && (defined __i386__ || defined __x86_64__) +# define __ASSUME_PREADV 1 +# define __ASSUME_PWRITEV 1 +#endif diff --git a/sysdeps/unix/sysv/linux/preadv.c b/sysdeps/unix/sysv/linux/preadv.c new file mode 100644 index 0000000000..e2f8238596 --- /dev/null +++ b/sysdeps/unix/sysv/linux/preadv.c @@ -0,0 +1,88 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <stddef.h> +#include <sys/param.h> +#if __WORDSIZE == 64 +/* Hide the preadv64 declaration. */ +# define preadv64 __redirect_preadv64 +#endif +#include <sys/uio.h> + +#include <sysdep-cancel.h> +#include <sys/syscall.h> +#include <kernel-features.h> + +#ifndef PREADV +# define PREADV preadv +# define PREADV_REPLACEMENT __atomic_preadv_replacement +# define PREAD __pread +# define OFF_T off_t +#endif + +static ssize_t PREADV_REPLACEMENT (int, __const struct iovec *, + int, OFF_T) internal_function; + + +ssize_t +PREADV (fd, vector, count, offset) + int fd; + const struct iovec *vector; + int count; + OFF_T offset; +{ +#ifdef __NR_preadv + ssize_t result; + + if (SINGLE_THREAD_P) + result = INLINE_SYSCALL (preadv, 5, fd, vector, count, offset >> 32, + offset & 0xffffffff); + else + { + int oldtype = LIBC_CANCEL_ASYNC (); + + result = INLINE_SYSCALL (preadv, 5, fd, vector, count, offset >> 32, + offset & 0xffffffff); + + LIBC_CANCEL_RESET (oldtype); + } +# ifdef __ASSUME_PREADV + return result; +# endif +#endif + +#ifndef __ASSUME_PREADV +# ifdef __NR_preadv + if (result >= 0 || errno != ENOSYS) + return result; +# endif + + return PREADV_REPLACEMENT (fd, vector, count, offset); +#endif +} +#if __WORDSIZE == 64 +# undef preadv64 +strong_alias (preadv, preadv64) +#endif + +#ifndef __ASSUME_PREADV +# undef PREADV +# define PREADV static internal_function PREADV_REPLACEMENT +# include <sysdeps/posix/preadv.c> +#endif diff --git a/sysdeps/unix/sysv/linux/preadv64.c b/sysdeps/unix/sysv/linux/preadv64.c new file mode 100644 index 0000000000..739df00257 --- /dev/null +++ b/sysdeps/unix/sysv/linux/preadv64.c @@ -0,0 +1,6 @@ +#define PREADV preadv64 +#define PREADV_REPLACEMENT __atomic_preadv64_replacement +#define PREAD __pread64 +#define OFF_T off64_t + +#include "preadv.c" diff --git a/sysdeps/unix/sysv/linux/pwritev.c b/sysdeps/unix/sysv/linux/pwritev.c new file mode 100644 index 0000000000..df430ffe46 --- /dev/null +++ b/sysdeps/unix/sysv/linux/pwritev.c @@ -0,0 +1,88 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <stddef.h> +#include <sys/param.h> +#if __WORDSIZE == 64 && !defined PWRITEV +/* Hide the pwritev64 declaration. */ +# define pwritev64 __redirect_pwritev64 +#endif +#include <sys/uio.h> + +#include <sysdep-cancel.h> +#include <sys/syscall.h> +#include <kernel-features.h> + +#ifndef PWRITEV +# define PWRITEV pwritev +# define PWRITEV_REPLACEMENT __atomic_pwritev_replacement +# define PWRITE __pwrite +# define OFF_T off_t +#endif + +static ssize_t PWRITEV_REPLACEMENT (int, __const struct iovec *, + int, OFF_T) internal_function; + + +ssize_t +PWRITEV (fd, vector, count, offset) + int fd; + const struct iovec *vector; + int count; + OFF_T offset; +{ +#ifdef __NR_pwritev + ssize_t result; + + if (SINGLE_THREAD_P) + result = INLINE_SYSCALL (pwritev, 5, fd, vector, count, offset >> 32, + offset & 0xffffffff); + else + { + int oldtype = LIBC_CANCEL_ASYNC (); + + result = INLINE_SYSCALL (pwritev, 5, fd, vector, count, offset >> 32, + offset & 0xffffffff); + + LIBC_CANCEL_RESET (oldtype); + } +# ifdef __ASSUME_PWRITEV + return result; +# endif +#endif + +#ifndef __ASSUME_PWRITEV +# ifdef __NR_pwritev + if (result >= 0 || errno != ENOSYS) + return result; +# endif + + return PWRITEV_REPLACEMENT (fd, vector, count, offset); +#endif +} +#if __WORDSIZE == 64 && defined pwritev64 +# undef pwritev64 +strong_alias (pwritev, pwritev64) +#endif + +#ifndef __ASSUME_PWRITEV +# undef PWRITEV +# define PWRITEV static internal_function PWRITEV_REPLACEMENT +# include <sysdeps/posix/pwritev.c> +#endif diff --git a/sysdeps/unix/sysv/linux/pwritev64.c b/sysdeps/unix/sysv/linux/pwritev64.c new file mode 100644 index 0000000000..1e8168f103 --- /dev/null +++ b/sysdeps/unix/sysv/linux/pwritev64.c @@ -0,0 +1,6 @@ +#define PWRITEV pwritev64 +#define PWRITEV_REPLACEMENT __atomic_pwritev64_replacement +#define PWRITE __pwrite64 +#define OFF_T off64_t + +#include "pwritev.c" diff --git a/sysdeps/unix/sysv/linux/readv.c b/sysdeps/unix/sysv/linux/readv.c index 250c00a075..bff4a3ff74 100644 --- a/sysdeps/unix/sysv/linux/readv.c +++ b/sysdeps/unix/sysv/linux/readv.c @@ -1,5 +1,5 @@ /* readv supports all Linux kernels >= 2.0. - Copyright (C) 1997,1998,2000,2002,2003 Free Software Foundation, Inc. + Copyright (C) 1997,1998,2000,2002,2003,2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,6 +25,7 @@ #include <sysdep-cancel.h> #include <sys/syscall.h> #include <bp-checks.h> +#include <kernel-features.h> static ssize_t __atomic_readv_replacement (int, __const struct iovec *, int) internal_function; @@ -36,41 +37,38 @@ static ssize_t __atomic_readv_replacement (int, __const struct iovec *, #endif -/* We should deal with kernel which have a smaller UIO_FASTIOV as well - as a very big count. */ -static ssize_t -do_readv (int fd, const struct iovec *vector, int count) -{ - ssize_t bytes_read; - - bytes_read = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count); - - if (bytes_read >= 0 || errno != EINVAL || count <= UIO_FASTIOV) - return bytes_read; - - return __atomic_readv_replacement (fd, vector, count); -} - - ssize_t __libc_readv (fd, vector, count) int fd; const struct iovec *vector; int count; { - if (SINGLE_THREAD_P) - return do_readv (fd, vector, count); + ssize_t result; - int oldtype = LIBC_CANCEL_ASYNC (); + if (SINGLE_THREAD_P) + result = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count); + else + { + int oldtype = LIBC_CANCEL_ASYNC (); - int result = do_readv (fd, vector, count); + result = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count); - LIBC_CANCEL_RESET (oldtype); + LIBC_CANCEL_RESET (oldtype); + } +#ifdef __ASSUME_COMPLETE_READV_WRITEV return result; +#else + if (result >= 0 || errno != EINVAL || count <= UIO_FASTIOV) + return result; + + return __atomic_readv_replacement (fd, vector, count); +#endif } strong_alias (__libc_readv, __readv) weak_alias (__libc_readv, readv) -#define __libc_readv static internal_function __atomic_readv_replacement -#include <sysdeps/posix/readv.c> +#ifndef __ASSUME_COMPLETE_READV_WRITEV +# define __libc_readv static internal_function __atomic_readv_replacement +# include <sysdeps/posix/readv.c> +#endif diff --git a/sysdeps/unix/sysv/linux/sys/eventfd.h b/sysdeps/unix/sysv/linux/sys/eventfd.h index 7c6cf7196d..d942df4bf9 100644 --- a/sysdeps/unix/sysv/linux/sys/eventfd.h +++ b/sysdeps/unix/sysv/linux/sys/eventfd.h @@ -28,6 +28,8 @@ typedef uint64_t eventfd_t; /* Flags for signalfd. */ enum { + EFD_SEMAPHORE = 1, +#define EFD_SEMAPHORE EFD_SEMAPHORE EFD_CLOEXEC = 02000000, #define EFD_CLOEXEC EFD_CLOEXEC EFD_NONBLOCK = 04000 diff --git a/sysdeps/unix/sysv/linux/wordsize-64/preadv64.c b/sysdeps/unix/sysv/linux/wordsize-64/preadv64.c new file mode 100644 index 0000000000..fd9320cfc7 --- /dev/null +++ b/sysdeps/unix/sysv/linux/wordsize-64/preadv64.c @@ -0,0 +1 @@ +/* Empty since the preadv syscall is equivalent. */ diff --git a/sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c b/sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c new file mode 100644 index 0000000000..8b72a2928b --- /dev/null +++ b/sysdeps/unix/sysv/linux/wordsize-64/pwritev64.c @@ -0,0 +1 @@ +/* Empty since the pwritev syscall is equivalent. */ diff --git a/sysdeps/unix/sysv/linux/writev.c b/sysdeps/unix/sysv/linux/writev.c index 05978665fa..55e915d34d 100644 --- a/sysdeps/unix/sysv/linux/writev.c +++ b/sysdeps/unix/sysv/linux/writev.c @@ -1,5 +1,5 @@ /* writev supports all Linux kernels >= 2.0. - Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. + Copyright (C) 1997,1998,2000,2002,2003,2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,6 +25,7 @@ #include <sysdep-cancel.h> #include <sys/syscall.h> #include <bp-checks.h> +#include <kernel-features.h> static ssize_t __atomic_writev_replacement (int, const struct iovec *, int) internal_function; @@ -36,40 +37,38 @@ static ssize_t __atomic_writev_replacement (int, const struct iovec *, #endif -/* We should deal with kernel which have a smaller UIO_FASTIOV as well - as a very big count. */ -static ssize_t -do_writev (int fd, const struct iovec *vector, int count) -{ - ssize_t bytes_written; - - bytes_written = INLINE_SYSCALL (writev, 3, fd, CHECK_N (vector, count), count); - - if (bytes_written >= 0 || errno != EINVAL || count <= UIO_FASTIOV) - return bytes_written; - - return __atomic_writev_replacement (fd, vector, count); -} - ssize_t __libc_writev (fd, vector, count) int fd; const struct iovec *vector; int count; { - if (SINGLE_THREAD_P) - return do_writev (fd, vector, count); + ssize_t result; - int oldtype = LIBC_CANCEL_ASYNC (); + if (SINGLE_THREAD_P) + result = INLINE_SYSCALL (writev, 3, fd, CHECK_N (vector, count), count); + else + { + int oldtype = LIBC_CANCEL_ASYNC (); - ssize_t result = do_writev (fd, vector, count); + result = INLINE_SYSCALL (writev, 3, fd, CHECK_N (vector, count), count); - LIBC_CANCEL_RESET (oldtype); + LIBC_CANCEL_RESET (oldtype); + } +#ifdef __ASSUME_COMPLETE_READV_WRITEV return result; +#else + if (result >= 0 || errno != EINVAL || count <= UIO_FASTIOV) + return result; + + return __atomic_writev_replacement (fd, vector, count); +#endif } strong_alias (__libc_writev, __writev) weak_alias (__libc_writev, writev) -#define __libc_writev static internal_function __atomic_writev_replacement -#include <sysdeps/posix/writev.c> +#ifndef __ASSUME_COMPLETE_READV_WRITEV +# define __libc_writev static internal_function __atomic_writev_replacement +# include <sysdeps/posix/writev.c> +#endif diff --git a/sysdeps/x86_64/strchr.S b/sysdeps/x86_64/strchr.S index 8934697972..8833cd0cc4 100644 --- a/sysdeps/x86_64/strchr.S +++ b/sysdeps/x86_64/strchr.S @@ -1,6 +1,6 @@ /* strchr (str, ch) -- Return pointer to first occurrence of CH in STR. For AMD x86-64. - Copyright (C) 2002, 2005 Free Software Foundation, Inc. + Copyright (C) 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -19,273 +19,52 @@ 02111-1307 USA. */ #include <sysdep.h> -#include "asm-syntax.h" -#include "bp-sym.h" -#include "bp-asm.h" .text -ENTRY (BP_SYM (strchr)) - - /* Before we start with the main loop we process single bytes - until the source pointer is aligned. This has two reasons: - 1. aligned 64-bit memory access is faster - and (more important) - 2. we process in the main loop 64 bit in one step although - we don't know the end of the string. But accessing at - 8-byte alignment guarantees that we never access illegal - memory if this would not also be done by the trivial - implementation (this is because all processor inherent - boundaries are multiples of 8). */ - - movq %rdi, %rdx - andl $7, %edx /* Mask alignment bits */ - movq %rdi, %rax /* duplicate destination. */ - jz 1f /* aligned => start loop */ - neg %edx - addl $8, %edx /* Align to 8 bytes. */ - - /* Search the first bytes directly. */ -0: movb (%rax), %cl /* load byte */ - cmpb %cl,%sil /* compare byte. */ - je 6f /* target found */ - testb %cl,%cl /* is byte NUL? */ - je 7f /* yes => return NULL */ - incq %rax /* increment pointer */ - decl %edx - jnz 0b - - -1: - /* At the moment %rsi contains C. What we need for the - algorithm is C in all bytes of the register. Avoid - operations on 16 bit words because these require an - prefix byte (and one more cycle). */ - /* Populate 8 bit data to full 64-bit. */ - movabs $0x0101010101010101,%r9 - movzbl %sil,%edx - imul %rdx,%r9 - - movq $0xfefefefefefefeff, %r8 /* Save magic. */ - - /* We exit the loop if adding MAGIC_BITS to LONGWORD fails to - change any of the hole bits of LONGWORD. - - 1) Is this safe? Will it catch all the zero bytes? - Suppose there is a byte with all zeros. Any carry bits - propagating from its left will fall into the hole at its - least significant bit and stop. Since there will be no - carry from its most significant bit, the LSB of the - byte to the left will be unchanged, and the zero will be - detected. - - 2) Is this worthwhile? Will it ignore everything except - zero bytes? Suppose every byte of QUARDWORD has a bit set - somewhere. There will be a carry into bit 8. If bit 8 - is set, this will carry into bit 16. If bit 8 is clear, - one of bits 9-15 must be set, so there will be a carry - into bit 16. Similarly, there will be a carry into bit - 24 tec.. If one of bits 54-63 is set, there will be a carry - into bit 64 (=carry flag), so all of the hole bits will - be changed. - - 3) But wait! Aren't we looking for C, not zero? - Good point. So what we do is XOR LONGWORD with a longword, - each of whose bytes is C. This turns each byte that is C - into a zero. */ - - .p2align 4 -4: - /* Main Loop is unrolled 4 times. */ - /* First unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - xorq %r9, %rcx /* XOR with qword c|...|c => bytes of str == c - are now 0 */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found c => return pointer */ - - /* The quadword we looked at does not contain the value we're looking - for. Let's search now whether we have reached the end of the - string. */ - xorq %r9, %rcx /* restore original dword without reload */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 7f /* highest byte is NUL => return NULL */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 7f /* found NUL => return NULL */ - - /* Second unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - xorq %r9, %rcx /* XOR with qword c|...|c => bytes of str == c - are now 0 */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found c => return pointer */ - - /* The quadword we looked at does not contain the value we're looking - for. Let's search now whether we have reached the end of the - string. */ - xorq %r9, %rcx /* restore original dword without reload */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 7f /* highest byte is NUL => return NULL */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 7f /* found NUL => return NULL */ - /* Third unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - xorq %r9, %rcx /* XOR with qword c|...|c => bytes of str == c - are now 0 */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found c => return pointer */ - - /* The quadword we looked at does not contain the value we're looking - for. Let's search now whether we have reached the end of the - string. */ - xorq %r9, %rcx /* restore original dword without reload */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 7f /* highest byte is NUL => return NULL */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 7f /* found NUL => return NULL */ - /* Fourth unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - xorq %r9, %rcx /* XOR with qword c|...|c => bytes of str == c - are now 0 */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found c => return pointer */ - - /* The quadword we looked at does not contain the value we're looking - for. Let's search now whether we have reached the end of the - string. */ - xorq %r9, %rcx /* restore original dword without reload */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 7f /* highest byte is NUL => return NULL */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jz 4b /* no NUL found => restart loop */ - - -7: /* Return NULL. */ - xorl %eax, %eax - retq - - - /* We now scan for the byte in which the character was matched. - But we have to take care of the case that a NUL char is - found before this in the dword. Note that we XORed %rcx - with the byte we're looking for, therefore the tests below look - reversed. */ - - - .p2align 4 /* Align, it's a jump target. */ -3: movq %r9,%rdx /* move to %rdx so that we can access bytes */ - subq $8,%rax /* correct pointer increment. */ - testb %cl, %cl /* is first byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %cl /* is first byte NUL? */ - je 7b /* yes => return NULL */ - incq %rax /* increment pointer */ - - testb %ch, %ch /* is second byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %ch /* is second byte NUL? */ - je 7b /* yes => return NULL? */ - incq %rax /* increment pointer */ - - shrq $16, %rcx /* make upper bytes accessible */ - testb %cl, %cl /* is third byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %cl /* is third byte NUL? */ - je 7b /* yes => return NULL */ - incq %rax /* increment pointer */ - - testb %ch, %ch /* is fourth byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %ch /* is fourth byte NUL? */ - je 7b /* yes => return NULL? */ - incq %rax /* increment pointer */ - - shrq $16, %rcx /* make upper bytes accessible */ - testb %cl, %cl /* is fifth byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %cl /* is fifth byte NUL? */ - je 7b /* yes => return NULL */ - incq %rax /* increment pointer */ - - testb %ch, %ch /* is sixth byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %ch /* is sixth byte NUL? */ - je 7b /* yes => return NULL? */ - incq %rax /* increment pointer */ - - shrq $16, %rcx /* make upper bytes accessible */ - testb %cl, %cl /* is seventh byte C? */ - jz 6f /* yes => return pointer */ - cmpb %dl, %cl /* is seventh byte NUL? */ - je 7b /* yes => return NULL */ - - /* It must be in the eigth byte and it cannot be NUL. */ - incq %rax - -6: - nop - retq -END (BP_SYM (strchr)) - -weak_alias (BP_SYM (strchr), BP_SYM (index)) +ENTRY (strchr) + movd %esi, %xmm1 + movq %rdi, %rcx + punpcklbw %xmm1, %xmm1 + andq $~15, %rdi + pxor %xmm2, %xmm2 + punpcklbw %xmm1, %xmm1 + orl $0xffffffff, %esi + movdqa (%rdi), %xmm0 + pshufd $0, %xmm1, %xmm1 + subq %rdi, %rcx + movdqa %xmm0, %xmm3 + leaq 16(%rdi), %rdi + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm3 + shl %cl, %esi + pmovmskb %xmm0, %edx + pmovmskb %xmm3, %ecx + andl %esi, %edx + andl %esi, %ecx + orl %edx, %ecx + jnz 1f + +2: movdqa (%rdi), %xmm0 + leaq 16(%rdi), %rdi + movdqa %xmm0, %xmm3 + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm3 + pmovmskb %xmm0, %edx + pmovmskb %xmm3, %ecx + orl %edx, %ecx + jz 2b + +1: bsfl %edx, %edx + jz 4f + bsfl %ecx, %ecx + leaq -16(%rdi,%rdx), %rax + cmpl %edx, %ecx + je 5f +4: xorl %eax, %eax +5: ret +END (strchr) + +weak_alias (strchr, index) libc_hidden_builtin_def (strchr) + diff --git a/sysdeps/x86_64/strlen.S b/sysdeps/x86_64/strlen.S index fd950edaaa..b83332c90c 100644 --- a/sysdeps/x86_64/strlen.S +++ b/sysdeps/x86_64/strlen.S @@ -1,6 +1,6 @@ /* strlen(str) -- determine the length of the string STR. - Copyright (C) 2002, 2003 Free Software Foundation, Inc. - Based on i486 version contributed by Ulrich Drepper <drepper@redhat.com>. + Copyright (C) 2009 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@redhat.com>. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -19,121 +19,35 @@ 02111-1307 USA. */ #include <sysdep.h> -#include "asm-syntax.h" -#include "bp-sym.h" -#include "bp-asm.h" - .text -ENTRY (strlen) - movq %rdi, %rcx /* Duplicate source pointer. */ - andl $7, %ecx /* mask alignment bits */ - movq %rdi, %rax /* duplicate destination. */ - jz 1f /* aligned => start loop */ - - neg %ecx /* We need to align to 8 bytes. */ - addl $8,%ecx - /* Search the first bytes directly. */ -0: cmpb $0x0,(%rax) /* is byte NUL? */ - je 2f /* yes => return */ - incq %rax /* increment pointer */ - decl %ecx - jnz 0b - -1: movq $0xfefefefefefefeff,%r8 /* Save magic. */ - - .p2align 4 /* Align loop. */ -4: /* Main Loop is unrolled 4 times. */ - /* First unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found NUL => return pointer */ - - /* Second unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found NUL => return pointer */ - - /* Third unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jnz 3f /* found NUL => return pointer */ - - /* Fourth unroll. */ - movq (%rax), %rcx /* get double word (= 8 bytes) in question */ - addq $8,%rax /* adjust pointer for next word */ - movq %r8, %rdx /* magic value */ - addq %rcx, %rdx /* add the magic value to the word. We get - carry bits reported for each byte which - is *not* 0 */ - jnc 3f /* highest byte is NUL => return pointer */ - xorq %rcx, %rdx /* (word+magic)^word */ - orq %r8, %rdx /* set all non-carry bits */ - incq %rdx /* add 1: if one carry bit was *not* set - the addition will not result in 0. */ - jz 4b /* no NUL found => continue loop */ - - .p2align 4 /* Align, it's a jump target. */ -3: subq $8,%rax /* correct pointer increment. */ - - testb %cl, %cl /* is first byte NUL? */ - jz 2f /* yes => return */ - incq %rax /* increment pointer */ - - testb %ch, %ch /* is second byte NUL? */ - jz 2f /* yes => return */ - incq %rax /* increment pointer */ - - testl $0x00ff0000, %ecx /* is third byte NUL? */ - jz 2f /* yes => return pointer */ - incq %rax /* increment pointer */ - - testl $0xff000000, %ecx /* is fourth byte NUL? */ - jz 2f /* yes => return pointer */ - incq %rax /* increment pointer */ - - shrq $32, %rcx /* look at other half. */ - - testb %cl, %cl /* is first byte NUL? */ - jz 2f /* yes => return */ - incq %rax /* increment pointer */ - - testb %ch, %ch /* is second byte NUL? */ - jz 2f /* yes => return */ - incq %rax /* increment pointer */ - - testl $0xff0000, %ecx /* is third byte NUL? */ - jz 2f /* yes => return pointer */ - incq %rax /* increment pointer */ -2: - subq %rdi, %rax /* compute difference to string start */ +ENTRY(strlen) + movq %rdi, %rcx + movq %rdi, %r8 + andq $~15, %rdi + pxor %xmm1, %xmm1 + orl $0xffffffff, %esi + movdqa (%rdi), %xmm0 + subq %rdi, %rcx + leaq 16(%rdi), %rdi + pcmpeqb %xmm1, %xmm0 + shl %cl, %esi + pmovmskb %xmm0, %edx + xorl %eax, %eax + negq %r8 + andl %esi, %edx + jnz 1f + +2: movdqa (%rdi), %xmm0 + leaq 16(%rdi), %rdi + pcmpeqb %xmm1, %xmm0 + pmovmskb %xmm0, %edx + testl %edx, %edx + jz 2b + +1: leaq -16(%rdi,%r8), %rdi + bsfl %edx, %eax + addq %rdi, %rax ret -END (strlen) +END(strlen) libc_hidden_builtin_def (strlen) |