Merge commit 'refs/top-bases/t/bigmem' into t/bigmem

1 files changed, 109 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h b/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
new file mode 100644
index 0000000000..6436ff026a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
@@ -0,0 +1,109 @@
+/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
+
+   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>
+#include <tls.h>
+#ifndef __ASSEMBLER__
+# include <nptl/pthreadP.h>
+#endif
+
+#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
+
+/* The code to disable cancellation depends on the fact that the called
+   functions are special.  They don't modify registers other than %rax
+   and %r11 if they return.  Therefore we don't have to preserve other
+   registers around these calls.  */
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args)				      \
+  .text;								      \
+  ENTRY (name)								      \
+    SINGLE_THREAD_P;							      \
+    jne L(pseudo_cancel);						      \
+  .type __##syscall_name##_nocancel,@function;				      \
+  .globl __##syscall_name##_nocancel;					      \
+  __##syscall_name##_nocancel:						      \
+    DO_CALL (syscall_name, args);					      \
+    cmpq $-4095, %rax;							      \
+    jae SYSCALL_ERROR_LABEL;						      \
+    ret;								      \
+  .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	      \
+  L(pseudo_cancel):							      \
+    /* We always have to align the stack before calling a function.  */	      \
+    subq $8, %rsp; cfi_adjust_cfa_offset (8);				      \
+    CENABLE								      \
+    /* The return value from CENABLE is argument for CDISABLE.  */	      \
+    movq %rax, (%rsp);							      \
+    DO_CALL (syscall_name, args);					      \
+    movq (%rsp), %rdi;							      \
+    /* Save %rax since it's the error code from the syscall.  */	      \
+    movq %rax, %rdx;							      \
+    CDISABLE								      \
+    movq %rdx, %rax;							      \
+    addq $8,%rsp; cfi_adjust_cfa_offset (-8);				      \
+    cmpq $-4095, %rax;							      \
+    jae SYSCALL_ERROR_LABEL
+
+
+# if IS_IN (libpthread)
+#  define CENABLE	call __pthread_enable_asynccancel;
+#  define CDISABLE	call __pthread_disable_asynccancel;
+#  define __local_multiple_threads __pthread_multiple_threads
+# elif IS_IN (libc)
+#  define CENABLE	call __libc_enable_asynccancel;
+#  define CDISABLE	call __libc_disable_asynccancel;
+#  define __local_multiple_threads __libc_multiple_threads
+# elif IS_IN (librt)
+#  define CENABLE	call __librt_enable_asynccancel;
+#  define CDISABLE	call __librt_disable_asynccancel;
+# else
+#  error Unsupported library
+# endif
+
+# if IS_IN (libpthread) || IS_IN (libc)
+#  ifndef __ASSEMBLER__
+extern int __local_multiple_threads attribute_hidden;
+#   define SINGLE_THREAD_P \
+  __builtin_expect (__local_multiple_threads == 0, 1)
+#  else
+#   define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
+#  endif
+
+# else
+
+#  ifndef __ASSEMBLER__
+#   define SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+				   header.multiple_threads) == 0, 1)
+#  else
+#   define SINGLE_THREAD_P cmpl $0, %fs:MULTIPLE_THREADS_OFFSET
+#  endif
+
+# endif
+
+#elif !defined __ASSEMBLER__
+
+# define SINGLE_THREAD_P (1)
+# define NO_CANCELLATION 1
+
+#endif
+
+#ifndef __ASSEMBLER__
+# define RTLD_SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+				   header.multiple_threads) == 0, 1)
+#endif