GNU C Library master sources branch hjl/i386/master created. glibc-2.22-386-g92fc2b2

hjl@sourceware.org hjl@sourceware.org
Thu Oct 15 12:32:00 GMT 2015


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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=92fc2b21d5cd2a43c5d19039bf4d6dcb5a60487b

commit 92fc2b21d5cd2a43c5d19039bf4d6dcb5a60487b
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Aug 12 12:10:06 2015 -0700

    Remove i386/epoll_pwait.S
    
    Only i386 implements epoll_pwait in assembly code withot cancellation
    support.  All other architectures implement epoll_pwait in epoll_pwait.c
    with
    
    int epoll_pwait (int epfd, struct epoll_event *events,
    		 int maxevents, int timeout,
    		 const sigset_t *set)
    {
      return SYSCALL_CANCEL (epoll_pwait, epfd, events, maxevents,
    			 timeout, set, _NSIG / 8);
    }
    
    Although there is no test for epoll_pwait in glibc, since SYSCALL_CANCEL
    works on i386 and epoll_pwait.c works for other architectures, it is
    safe to assume that epoll_pwait.c with SYSCALL_CANCEL also works on
    i386.
    
    	[BZ #19137]
    	* sysdeps/unix/sysv/linux/i386/Makefile (CFLAGS-epoll_pwait.c):
    	Add -fomit-frame-pointer.
    	* sysdeps/unix/sysv/linux/i386/epoll_pwait.S: Remove file.

diff --git a/sysdeps/unix/sysv/linux/i386/Makefile b/sysdeps/unix/sysv/linux/i386/Makefile
index 49ccf3e..b484217 100644
--- a/sysdeps/unix/sysv/linux/i386/Makefile
+++ b/sysdeps/unix/sysv/linux/i386/Makefile
@@ -4,6 +4,7 @@ default-abi := 32
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl vm86
 # %ebp may be used to pass the 6th argument to syscall.
+CFLAGS-epoll_pwait.c += -fomit-frame-pointer
 CFLAGS-mmap.c += -fomit-frame-pointer
 CFLAGS-mmap64.c += -fomit-frame-pointer
 endif
diff --git a/sysdeps/unix/sysv/linux/i386/epoll_pwait.S b/sysdeps/unix/sysv/linux/i386/epoll_pwait.S
deleted file mode 100644
index 65cfb98..0000000
--- a/sysdeps/unix/sysv/linux/i386/epoll_pwait.S
+++ /dev/null
@@ -1,78 +0,0 @@
-/* Copyright (C) 2007-2015 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#define _ERRNO_H
-#include <bits/errno.h>
-#define _SIGNAL_H
-#include <bits/signum.h>
-
-
-	.text
-ENTRY (epoll_pwait)
-
-#ifdef __NR_epoll_pwait
-
-	/* Save registers.  */
-	pushl %ebp
-	cfi_adjust_cfa_offset (4)
-	pushl %ebx
-	cfi_adjust_cfa_offset (4)
-	pushl %esi
-	cfi_adjust_cfa_offset (4)
-	pushl %edi
-	cfi_adjust_cfa_offset (4)
-	cfi_rel_offset (edi, 0)
-	cfi_rel_offset (esi, 4)
-	cfi_rel_offset (ebx, 8)
-	cfi_rel_offset (ebp, 12)
-
-	movl 20(%esp), %ebx
-	movl 24(%esp), %ecx
-	movl 28(%esp), %edx
-	movl 32(%esp), %esi
-	movl 36(%esp), %edi
-	movl $_NSIG/8, %ebp
-	movl $__NR_epoll_pwait, %eax
-
-	ENTER_KERNEL
-
-	/* Restore registers.  */
-	popl %edi
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (edi)
-	popl %esi
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (esi)
-	popl %ebx
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (ebx)
-	popl %ebp
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (ebp)
-
-	/* If 0 > %eax > -4096 there was an error.  */
-	cmpl $-4096, %eax
-	ja SYSCALL_ERROR_LABEL
-
-	/* Successful; return the syscall's value.  */
-#else
-	movl $-ENOSYS, %eax
-	jmp SYSCALL_ERROR_LABEL
-#endif
-	ret
-PSEUDO_END (epoll_pwait)

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=442b784c73520eeb1814fd94c972e8a40feee86c

commit 442b784c73520eeb1814fd94c972e8a40feee86c
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Aug 21 14:46:05 2015 -0700

    Avoid reading errno in syscall implementations
    
    Reading errno is expensive for x86 PIC.  With INTERNAL_SYSCALL,
    INTERNAL_SYSCALL_ERROR_P, INTERNAL_SYSCALL_ERRNO and
    INLINE_SYSCALL_ERROR_RETURN_VALUE, we can avoid reading errno.
    
    	* sysdeps/unix/sysv/linux/eventfd.c (eventfd): Use
    	INTERNAL_SYSCALL, INTERNAL_SYSCALL_ERROR_P and
    	INTERNAL_SYSCALL_ERRNO to avoid reading errno.
    	* sysdeps/unix/sysv/linux/fstatfs64.c (__fstatfs64): Likewise.
    	* sysdeps/unix/sysv/linux/getrlimit64.c (__getrlimit64):
    	Likewise.
    	* sysdeps/unix/sysv/linux/setrlimit64.c (setrlimit64):
    	Likewise.
    	* sysdeps/unix/sysv/linux/signalfd.c (signalfd): Likewise.
    	* sysdeps/unix/sysv/linux/statfs64.c (__statfs64): Likewise.

diff --git a/sysdeps/unix/sysv/linux/eventfd.c b/sysdeps/unix/sysv/linux/eventfd.c
index efce282..a13be32 100644
--- a/sysdeps/unix/sysv/linux/eventfd.c
+++ b/sysdeps/unix/sysv/linux/eventfd.c
@@ -25,11 +25,15 @@ int
 eventfd (unsigned int count, int flags)
 {
 #ifdef __NR_eventfd2
-  int res = INLINE_SYSCALL (eventfd2, 2, count, flags);
 # ifndef __ASSUME_EVENTFD2
-  if (res != -1 || errno != ENOSYS)
-# endif
+  INTERNAL_SYSCALL_DECL (err);
+  int res = INTERNAL_SYSCALL (eventfd2, err, 2, count, flags);
+  if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))
+      || INTERNAL_SYSCALL_ERRNO (res, err) != ENOSYS)
     return res;
+# else
+  return INLINE_SYSCALL (eventfd2, 2, count, flags);
+# endif
 #endif
 
 #ifndef __ASSUME_EVENTFD2
diff --git a/sysdeps/unix/sysv/linux/fstatfs64.c b/sysdeps/unix/sysv/linux/fstatfs64.c
index af83830..eb21d42 100644
--- a/sysdeps/unix/sysv/linux/fstatfs64.c
+++ b/sysdeps/unix/sysv/linux/fstatfs64.c
@@ -35,12 +35,16 @@ __fstatfs64 (int fd, struct statfs64 *buf)
   if (! __no_statfs64)
 # endif
     {
-      int result = INLINE_SYSCALL (fstatfs64, 3, fd, sizeof (*buf), buf);
-
 # if __ASSUME_STATFS64 == 0
-      if (result == 0 || errno != ENOSYS)
-# endif
+      INTERNAL_SYSCALL_DECL (err);
+      int result = INTERNAL_SYSCALL (fstatfs64, err, 3, fd,
+				     sizeof (*buf), buf);
+      if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err))
+	  || INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
 	return result;
+# else
+      return INLINE_SYSCALL (fstatfs64, 3, fd, sizeof (*buf), buf);
+# endif
 
 # if __ASSUME_STATFS64 == 0
       __no_statfs64 = 1;
diff --git a/sysdeps/unix/sysv/linux/getrlimit64.c b/sysdeps/unix/sysv/linux/getrlimit64.c
index 100ba62..cca1265 100644
--- a/sysdeps/unix/sysv/linux/getrlimit64.c
+++ b/sysdeps/unix/sysv/linux/getrlimit64.c
@@ -30,8 +30,11 @@ __getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
   return INLINE_SYSCALL (prlimit64, 4, 0, resource, NULL, rlimits);
 #else
 # ifdef __NR_prlimit64
-  int res = INLINE_SYSCALL (prlimit64, 4, 0, resource, NULL, rlimits);
-  if (res == 0 || errno != ENOSYS)
+  INTERNAL_SYSCALL_DECL (err);
+  int res = INTERNAL_SYSCALL (prlimit64, err, 4, 0, resource, NULL,
+			      rlimits);
+  if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))
+      || INTERNAL_SYSCALL_ERRNO (res, err) != ENOSYS)
     return res;
 # endif
   struct rlimit rlimits32;
diff --git a/sysdeps/unix/sysv/linux/lxstat64.c b/sysdeps/unix/sysv/linux/lxstat64.c
index 5d0c051..63959cf 100644
--- a/sysdeps/unix/sysv/linux/lxstat64.c
+++ b/sysdeps/unix/sysv/linux/lxstat64.c
@@ -30,8 +30,11 @@
 int
 ___lxstat64 (int vers, const char *name, struct stat64 *buf)
 {
-  int result;
-  result = INLINE_SYSCALL (lstat64, 2, name, buf);
+  INTERNAL_SYSCALL_DECL (err);
+  int result = INTERNAL_SYSCALL (lstat64, err, 2, name, buf);
+  if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err)))
+    return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result,
+								      err));
 #if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
     buf->st_ino = buf->__st_ino;
diff --git a/sysdeps/unix/sysv/linux/setrlimit64.c b/sysdeps/unix/sysv/linux/setrlimit64.c
index 17f95cb..33e1500 100644
--- a/sysdeps/unix/sysv/linux/setrlimit64.c
+++ b/sysdeps/unix/sysv/linux/setrlimit64.c
@@ -33,8 +33,11 @@ setrlimit64 (resource, rlimits)
   return INLINE_SYSCALL (prlimit64, 4, 0, resource, rlimits, NULL);
 #else
 # ifdef __NR_prlimit64
-  int res = INLINE_SYSCALL (prlimit64, 4, 0, resource, rlimits, NULL);
-  if (res == 0 || errno != ENOSYS)
+  INTERNAL_SYSCALL_DECL (err);
+  int res = INTERNAL_SYSCALL (prlimit64, err, 4, 0, resource, rlimits,
+			      NULL);
+  if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))
+      || INTERNAL_SYSCALL_ERRNO (res, err) != ENOSYS)
     return res;
 # endif
   struct rlimit rlimits32;
diff --git a/sysdeps/unix/sysv/linux/signalfd.c b/sysdeps/unix/sysv/linux/signalfd.c
index 8573450..d58edc7 100644
--- a/sysdeps/unix/sysv/linux/signalfd.c
+++ b/sysdeps/unix/sysv/linux/signalfd.c
@@ -26,11 +26,16 @@ int
 signalfd (int fd, const sigset_t *mask, int flags)
 {
 #ifdef __NR_signalfd4
-  int res = INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
 # ifndef __ASSUME_SIGNALFD4
-  if (res != -1 || errno != ENOSYS)
-# endif
+  INTERNAL_SYSCALL_DECL (err);
+  int res = INTERNAL_SYSCALL (signalfd4, err, 4, fd, mask, _NSIG / 8,
+			      flags);
+  if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))
+      || INTERNAL_SYSCALL_ERRNO (res, err) != ENOSYS)
     return res;
+# else
+  return INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
+# endif
 #endif
 
 #ifndef __ASSUME_SIGNALFD4
diff --git a/sysdeps/unix/sysv/linux/statfs64.c b/sysdeps/unix/sysv/linux/statfs64.c
index ac5c33f..fdd1667 100644
--- a/sysdeps/unix/sysv/linux/statfs64.c
+++ b/sysdeps/unix/sysv/linux/statfs64.c
@@ -37,12 +37,17 @@ __statfs64 (const char *file, struct statfs64 *buf)
   if (! __no_statfs64)
 # endif
     {
-      int result = INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf);
-
 # if __ASSUME_STATFS64 == 0
-      if (result == 0 || errno != ENOSYS)
-# endif
+      INTERNAL_SYSCALL_DECL (err);
+      int result = INTERNAL_SYSCALL (statfs64, err, 3, file,
+				     sizeof (*buf), buf);
+
+      if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err))
+	  || INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
 	return result;
+# else
+      return INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf);
+# endif
 
 # if __ASSUME_STATFS64 == 0
       __no_statfs64 = 1;

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