glibc/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h

/* Copyright (C) 2002-2017 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)

# undef PSEUDO
# define PSEUDO(name, syscall_name, args)				      \
  .text;								      \
  ENTRY (name)								      \
    cmpl $0, %gs:MULTIPLE_THREADS_OFFSET;				      \
    jne L(pseudo_cancel);						      \
  .type __##syscall_name##_nocancel,@function;				      \
  .globl __##syscall_name##_nocancel;					      \
  __##syscall_name##_nocancel:						      \
    DO_CALL (syscall_name, args);					      \
    cmpl $-4095, %eax;							      \
    jae SYSCALL_ERROR_LABEL;						      \
    ret;								      \
  .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	      \
  L(pseudo_cancel):							      \
    CENABLE								      \
    SAVE_OLDTYPE_##args							      \
    PUSHCARGS_##args							      \
    DOCARGS_##args							      \
    movl $SYS_ify (syscall_name), %eax;					      \
    ENTER_KERNEL;							      \
    POPCARGS_##args;							      \
    POPSTATE_##args							      \
    cmpl $-4095, %eax;							      \
    jae SYSCALL_ERROR_LABEL

# define SAVE_OLDTYPE_0	movl %eax, %ecx;
# define SAVE_OLDTYPE_1	SAVE_OLDTYPE_0
# define SAVE_OLDTYPE_2	pushl %eax; cfi_adjust_cfa_offset (4);
# define SAVE_OLDTYPE_3	SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_4	SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_5	SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_6	SAVE_OLDTYPE_2

# define PUSHCARGS_0	/* No arguments to push.  */
# define DOCARGS_0	/* No arguments to frob.  */
# define POPCARGS_0	/* No arguments to pop.  */
# define _PUSHCARGS_0	/* No arguments to push.  */
# define _POPCARGS_0	/* No arguments to pop.  */

# define PUSHCARGS_1	movl %ebx, %edx; cfi_register (ebx, edx); PUSHCARGS_0
# define DOCARGS_1	_DOARGS_1 (4)
# define POPCARGS_1	POPCARGS_0; movl %edx, %ebx; cfi_restore (ebx);
# define _PUSHCARGS_1	pushl %ebx; cfi_adjust_cfa_offset (4); \
			cfi_rel_offset (ebx, 0); _PUSHCARGS_0
# define _POPCARGS_1	_POPCARGS_0; popl %ebx; \
			cfi_adjust_cfa_offset (-4); cfi_restore (ebx);

# define PUSHCARGS_2	PUSHCARGS_1
# define DOCARGS_2	_DOARGS_2 (12)
# define POPCARGS_2	POPCARGS_1
# define _PUSHCARGS_2	_PUSHCARGS_1
# define _POPCARGS_2	_POPCARGS_1

# define PUSHCARGS_3	_PUSHCARGS_2
# define DOCARGS_3	_DOARGS_3 (20)
# define POPCARGS_3	_POPCARGS_3
# define _PUSHCARGS_3	_PUSHCARGS_2
# define _POPCARGS_3	_POPCARGS_2

# define PUSHCARGS_4	_PUSHCARGS_4
# define DOCARGS_4	_DOARGS_4 (28)
# define POPCARGS_4	_POPCARGS_4
# define _PUSHCARGS_4	pushl %esi; cfi_adjust_cfa_offset (4); \
			cfi_rel_offset (esi, 0); _PUSHCARGS_3
# define _POPCARGS_4	_POPCARGS_3; popl %esi; \
			cfi_adjust_cfa_offset (-4); cfi_restore (esi);

# define PUSHCARGS_5	_PUSHCARGS_5
# define DOCARGS_5	_DOARGS_5 (36)
# define POPCARGS_5	_POPCARGS_5
# define _PUSHCARGS_5	pushl %edi; cfi_adjust_cfa_offset (4); \
			cfi_rel_offset (edi, 0); _PUSHCARGS_4
# define _POPCARGS_5	_POPCARGS_4; popl %edi; \
			cfi_adjust_cfa_offset (-4); cfi_restore (edi);

# define PUSHCARGS_6	_PUSHCARGS_6
# define DOCARGS_6	_DOARGS_6 (44)
# define POPCARGS_6	_POPCARGS_6
# define _PUSHCARGS_6	pushl %ebp; cfi_adjust_cfa_offset (4); \
			cfi_rel_offset (ebp, 0); _PUSHCARGS_5
# define _POPCARGS_6	_POPCARGS_5; popl %ebp; \
			cfi_adjust_cfa_offset (-4); cfi_restore (ebp);

# if IS_IN (libpthread)
#  define CENABLE	call __pthread_enable_asynccancel;
#  define CDISABLE	call __pthread_disable_asynccancel
# elif IS_IN (libc)
#  define CENABLE	call __libc_enable_asynccancel;
#  define CDISABLE	call __libc_disable_asynccancel
# elif IS_IN (librt)
#  define CENABLE	call __librt_enable_asynccancel;
#  define CDISABLE	call __librt_disable_asynccancel
# else
#  error Unsupported library
# endif
# define POPSTATE_0 \
 pushl %eax; cfi_adjust_cfa_offset (4); movl %ecx, %eax; \
 CDISABLE; popl %eax; cfi_adjust_cfa_offset (-4);
# define POPSTATE_1	POPSTATE_0
# define POPSTATE_2	xchgl (%esp), %eax; CDISABLE; popl %eax; \
			cfi_adjust_cfa_offset (-4);
# define POPSTATE_3	POPSTATE_2
# define POPSTATE_4	POPSTATE_3
# define POPSTATE_5	POPSTATE_4
# define POPSTATE_6	POPSTATE_5

# ifndef __ASSEMBLER__
#  define SINGLE_THREAD_P \
  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
				   header.multiple_threads) == 0, 1)
# else
#  define SINGLE_THREAD_P cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
# 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