/* Copyright (C) 1992-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper, <drepper@gnu.org>, August 1995.

   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/>.  */

#ifndef _LINUX_I386_SYSDEP_H

#define _LINUX_I386_SYSDEP_H 1

/* There is some commonality.  */

#include <sysdeps/unix/sysv/linux/sysdep.h>

#include <sysdeps/unix/i386/sysdep.h>

/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO.  */

#include <dl-sysdep.h>

#include <tls.h>

/* For Linux we can use the system call table in the header file

	/usr/include/asm/unistd.h

   of the kernel.  But these symbols do not follow the SYS_* syntax

   so we have to redefine the `SYS_ify' macro here.  */

#undef SYS_ify

#define SYS_ify(syscall_name)	__NR_##syscall_name

#ifndef I386_USE_SYSENTER

# if defined USE_DL_SYSINFO \

     && (IS_IN (libc) || IS_IN (libpthread))

#  define I386_USE_SYSENTER	1

# else

#  define I386_USE_SYSENTER	0

# endif

#endif

/* Since GCC 5 and above can properly spill %ebx with PIC when needed,

   we can inline syscalls with 6 arguments if GCC 5 or above is used

   to compile glibc.  Disable GCC 5 optimization when compiling for

   profiling or when -fno-omit-frame-pointer is used since asm ("ebp")

   can't be used to put the 6th argument in %ebp for syscall.  */

#if __GNUC_PREREQ (5,0) && !defined PROF && CAN_USE_REGISTER_ASM_EBP

# define OPTIMIZE_FOR_GCC_5

#endif

#ifdef __ASSEMBLER__

/* Linux uses a negative return value to indicate syscall errors,

   unlike most Unices, which use the condition codes' carry flag.

   Since version 2.1 the return value of a system call might be

   negative even if the call succeeded.  E.g., the `lseek' system call

   might return a large offset.  Therefore we must not anymore test

   for < 0, but test for a real error by making sure the value in %eax

   is a real error number.  Linus said he will make sure the no syscall

   returns a value in -1 .. -4095 as a valid result so we can savely

   test with -4095.  */

/* We don't want the label for the error handle to be global when we define

   it here.  */

#define SYSCALL_ERROR_LABEL __syscall_error

#undef	PSEUDO

#define	PSEUDO(name, syscall_name, args)				      \

  .text;								      \

  ENTRY (name)								      \

    DO_CALL (syscall_name, args);					      \

    cmpl $-4095, %eax;							      \

    jae SYSCALL_ERROR_LABEL

#undef	PSEUDO_END

#define	PSEUDO_END(name)						      \

  SYSCALL_ERROR_HANDLER							      \

  END (name)

#undef	PSEUDO_NOERRNO

#define	PSEUDO_NOERRNO(name, syscall_name, args)			      \

  .text;								      \

  ENTRY (name)								      \

    DO_CALL (syscall_name, args)

#undef	PSEUDO_END_NOERRNO

#define	PSEUDO_END_NOERRNO(name)					      \

  END (name)

#define ret_NOERRNO ret

/* The function has to return the error code.  */

#undef	PSEUDO_ERRVAL

#define	PSEUDO_ERRVAL(name, syscall_name, args) \

  .text;								      \

  ENTRY (name)								      \

    DO_CALL (syscall_name, args);					      \

    negl %eax

#undef	PSEUDO_END_ERRVAL

#define	PSEUDO_END_ERRVAL(name) \

  END (name)

#define ret_ERRVAL ret

#define SYSCALL_ERROR_HANDLER	/* Nothing here; code in sysdep.c is used.  */

/* The original calling convention for system calls on Linux/i386 is

   to use int $0x80.  */

#if I386_USE_SYSENTER

# ifdef PIC

#  define ENTER_KERNEL call *%gs:SYSINFO_OFFSET

# else

#  define ENTER_KERNEL call *_dl_sysinfo

# endif

#else

# define ENTER_KERNEL int $0x80

#endif

/* Linux takes system call arguments in registers:

	syscall number	%eax	     call-clobbered

	arg 1		%ebx	     call-saved

	arg 2		%ecx	     call-clobbered

	arg 3		%edx	     call-clobbered

	arg 4		%esi	     call-saved

	arg 5		%edi	     call-saved

	arg 6		%ebp	     call-saved

   The stack layout upon entering the function is:

	24(%esp)	Arg# 6

	20(%esp)	Arg# 5

	16(%esp)	Arg# 4

	12(%esp)	Arg# 3

	 8(%esp)	Arg# 2

	 4(%esp)	Arg# 1

	  (%esp)	Return address

   (Of course a function with say 3 arguments does not have entries for

   arguments 4, 5, and 6.)

   The following code tries hard to be optimal.  A general assumption

   (which is true according to the data books I have) is that

	2 * xchg	is more expensive than	pushl + movl + popl

   Beside this a neat trick is used.  The calling conventions for Linux

   tell that among the registers used for parameters %ecx and %edx need

   not be saved.  Beside this we may clobber this registers even when

   they are not used for parameter passing.

   As a result one can see below that we save the content of the %ebx

   register in the %edx register when we have less than 3 arguments

   (2 * movl is less expensive than pushl + popl).

   Second unlike for the other registers we don't save the content of

   %ecx and %edx when we have more than 1 and 2 registers resp.

   The code below might look a bit long but we have to take care for

   the pipelined processors (i586).  Here the `pushl' and `popl'

   instructions are marked as NP (not pairable) but the exception is

   two consecutive of these instruction.  This gives no penalty on

   other processors though.  */

#undef	DO_CALL

#define DO_CALL(syscall_name, args)			      		      \

    PUSHARGS_##args							      \

    DOARGS_##args							      \

    movl $SYS_ify (syscall_name), %eax;					      \

    ENTER_KERNEL							      \

    POPARGS_##args

#define PUSHARGS_0	/* No arguments to push.  */

#define	DOARGS_0	/* No arguments to frob.  */

#define	POPARGS_0	/* No arguments to pop.  */

#define	_PUSHARGS_0	/* No arguments to push.  */

#define _DOARGS_0(n)	/* No arguments to frob.  */

#define	_POPARGS_0	/* No arguments to pop.  */

#define PUSHARGS_1	movl %ebx, %edx; L(SAVEBX1): PUSHARGS_0

#define	DOARGS_1	_DOARGS_1 (4)

#define	POPARGS_1	POPARGS_0; movl %edx, %ebx; L(RESTBX1):

#define	_PUSHARGS_1	pushl %ebx; cfi_adjust_cfa_offset (4); \

			cfi_rel_offset (ebx, 0); L(PUSHBX1): _PUSHARGS_0

#define _DOARGS_1(n)	movl n(%esp), %ebx; _DOARGS_0(n-4)

#define	_POPARGS_1	_POPARGS_0; popl %ebx; cfi_adjust_cfa_offset (-4); \

			cfi_restore (ebx); L(POPBX1):

#define PUSHARGS_2	PUSHARGS_1

#define	DOARGS_2	_DOARGS_2 (8)

#define	POPARGS_2	POPARGS_1

#define _PUSHARGS_2	_PUSHARGS_1

#define	_DOARGS_2(n)	movl n(%esp), %ecx; _DOARGS_1 (n-4)

#define	_POPARGS_2	_POPARGS_1

#define PUSHARGS_3	_PUSHARGS_2

#define DOARGS_3	_DOARGS_3 (16)

#define POPARGS_3	_POPARGS_3

#define _PUSHARGS_3	_PUSHARGS_2

#define _DOARGS_3(n)	movl n(%esp), %edx; _DOARGS_2 (n-4)

#define _POPARGS_3	_POPARGS_2

#define PUSHARGS_4	_PUSHARGS_4

#define DOARGS_4	_DOARGS_4 (24)

#define POPARGS_4	_POPARGS_4

#define _PUSHARGS_4	pushl %esi; cfi_adjust_cfa_offset (4); \

			cfi_rel_offset (esi, 0); L(PUSHSI1): _PUSHARGS_3

#define _DOARGS_4(n)	movl n(%esp), %esi; _DOARGS_3 (n-4)

#define _POPARGS_4	_POPARGS_3; popl %esi; cfi_adjust_cfa_offset (-4); \

			cfi_restore (esi); L(POPSI1):

#define PUSHARGS_5	_PUSHARGS_5

#define DOARGS_5	_DOARGS_5 (32)

#define POPARGS_5	_POPARGS_5

#define _PUSHARGS_5	pushl %edi; cfi_adjust_cfa_offset (4); \

			cfi_rel_offset (edi, 0); L(PUSHDI1): _PUSHARGS_4

#define _DOARGS_5(n)	movl n(%esp), %edi; _DOARGS_4 (n-4)

#define _POPARGS_5	_POPARGS_4; popl %edi; cfi_adjust_cfa_offset (-4); \

			cfi_restore (edi); L(POPDI1):

#define PUSHARGS_6	_PUSHARGS_6

#define DOARGS_6	_DOARGS_6 (40)

#define POPARGS_6	_POPARGS_6

#define _PUSHARGS_6	pushl %ebp; cfi_adjust_cfa_offset (4); \

			cfi_rel_offset (ebp, 0); L(PUSHBP1): _PUSHARGS_5

#define _DOARGS_6(n)	movl n(%esp), %ebp; _DOARGS_5 (n-4)

#define _POPARGS_6	_POPARGS_5; popl %ebp; cfi_adjust_cfa_offset (-4); \

			cfi_restore (ebp); L(POPBP1):

#else	/* !__ASSEMBLER__ */

extern int __syscall_error (int)

  attribute_hidden __attribute__ ((__regparm__ (1)));

#ifndef OPTIMIZE_FOR_GCC_5

/* We need some help from the assembler to generate optimal code.  We

   define some macros here which later will be used.  */

asm (".L__X'%ebx = 1\n\t"

     ".L__X'%ecx = 2\n\t"

     ".L__X'%edx = 2\n\t"

     ".L__X'%eax = 3\n\t"

     ".L__X'%esi = 3\n\t"

     ".L__X'%edi = 3\n\t"

     ".L__X'%ebp = 3\n\t"

     ".L__X'%esp = 3\n\t"

     ".macro bpushl name reg\n\t"

     ".if 1 - \\name\n\t"

     ".if 2 - \\name\n\t"

     "error\n\t"

     ".else\n\t"

     "xchgl \\reg, %ebx\n\t"

     ".endif\n\t"

     ".endif\n\t"

     ".endm\n\t"

     ".macro bpopl name reg\n\t"

     ".if 1 - \\name\n\t"

     ".if 2 - \\name\n\t"

     "error\n\t"

     ".else\n\t"

     "xchgl \\reg, %ebx\n\t"

     ".endif\n\t"

     ".endif\n\t"

     ".endm\n\t");

/* Six-argument syscalls use an out-of-line helper, because an inline

   asm using all registers apart from %esp cannot work reliably and

   the assembler does not support describing an asm that saves and

   restores %ebp itself as a separate stack frame.  This structure

   stores the arguments not passed in registers; %edi is passed with a

   pointer to this structure.  */

struct libc_do_syscall_args

{

  int ebx, edi, ebp;

};

#endif

/* Define a macro which expands inline into the wrapper code for a system

   call.  */

#undef INLINE_SYSCALL

#if IS_IN (libc)

# define INLINE_SYSCALL(name, nr, args...) \

  ({									      \

    unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args);	      \

    __glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, ))		      \

    ? __syscall_error (-INTERNAL_SYSCALL_ERRNO (resultvar, ))		      \

    : (int) resultvar; })

#else

# define INLINE_SYSCALL(name, nr, args...) \

  ({									      \

    unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args);	      \

    if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, )))	      \

      {									      \

	__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, ));		      \

	resultvar = 0xffffffff;						      \

      }									      \

    (int) resultvar; })

#endif

/* Set error number and return -1.  Return the internal function,

   __syscall_error, which sets errno from the negative error number

   and returns -1, to avoid PIC.  */

#undef INLINE_SYSCALL_ERROR_RETURN_VALUE

#define INLINE_SYSCALL_ERROR_RETURN_VALUE(resultvar) \

  __syscall_error (-(resultvar))

/* List of system calls which are supported as vsyscalls.  */

# define HAVE_CLOCK_GETTIME_VSYSCALL    1

# define HAVE_GETTIMEOFDAY_VSYSCALL     1

/* Define a macro which expands inline into the wrapper code for a system

   call.  This use is for internal calls that do not need to handle errors

   normally.  It will never touch errno.  This returns just what the kernel

   gave back.

   The _NCS variant allows non-constant syscall numbers but it is not

   possible to use more than four parameters.  */

#undef INTERNAL_SYSCALL

#define INTERNAL_SYSCALL_MAIN_0(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 0, args)

#define INTERNAL_SYSCALL_MAIN_1(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 1, args)

#define INTERNAL_SYSCALL_MAIN_2(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 2, args)

#define INTERNAL_SYSCALL_MAIN_3(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 3, args)

#define INTERNAL_SYSCALL_MAIN_4(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 4, args)

#define INTERNAL_SYSCALL_MAIN_5(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 5, args)

/* Each object using 6-argument inline syscalls must include a

   definition of __libc_do_syscall.  */

#ifdef OPTIMIZE_FOR_GCC_5

# define INTERNAL_SYSCALL_MAIN_6(name, err, args...) \

    INTERNAL_SYSCALL_MAIN_INLINE(name, err, 6, args)

#else /* GCC 5  */

# define INTERNAL_SYSCALL_MAIN_6(name, err, arg1, arg2, arg3,		\

				 arg4, arg5, arg6)			\

  struct libc_do_syscall_args _xv =					\

    {									\

      (int) (arg1),							\

      (int) (arg5),							\

      (int) (arg6)							\

    };									\

    asm volatile (							\

    "movl %1, %%eax\n\t"						\

    "call __libc_do_syscall"						\

    : "=a" (resultvar)							\

    : "i" (__NR_##name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \

    : "memory", "cc")

#endif /* GCC 5  */

#define INTERNAL_SYSCALL(name, err, nr, args...) \

  ({									      \

    register unsigned int resultvar;					      \

    INTERNAL_SYSCALL_MAIN_##nr (name, err, args);			      \

    (int) resultvar; })

#if I386_USE_SYSENTER

# ifdef OPTIMIZE_FOR_GCC_5

#  ifdef PIC

#   define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "call *%%gs:%P2"							\

    : "=a" (resultvar)							\

    : "a" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo))		\

      ASMARGS_##nr(args) : "memory", "cc")

#   define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									\

    register unsigned int resultvar;					\

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "call *%%gs:%P2"							\

    : "=a" (resultvar)							\

    : "a" (name), "i" (offsetof (tcbhead_t, sysinfo))			\

      ASMARGS_##nr(args) : "memory", "cc");				\

    (int) resultvar; })

#  else

#   define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "call *_dl_sysinfo"							\

    : "=a" (resultvar)							\

    : "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc")

#   define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									\

    register unsigned int resultvar;					\

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "call *_dl_sysinfo"							\

    : "=a" (resultvar)							\

    : "a" (name) ASMARGS_##nr(args) : "memory", "cc");			\

    (int) resultvar; })

#  endif

# else /* GCC 5  */

#  ifdef PIC

#   define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "movl %1, %%eax\n\t"						      \

    "call *%%gs:%P2\n\t"						      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo))		      \

      ASMFMT_##nr(args) : "memory", "cc")

#   define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									      \

    register unsigned int resultvar;					      \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "call *%%gs:%P2\n\t"						      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "0" (name), "i" (offsetof (tcbhead_t, sysinfo))			      \

      ASMFMT_##nr(args) : "memory", "cc");				      \

    (int) resultvar; })

#  else

#   define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "movl %1, %%eax\n\t"						      \

    "call *_dl_sysinfo\n\t"						      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc")

#   define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									      \

    register unsigned int resultvar;					      \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "call *_dl_sysinfo\n\t"						      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "0" (name) ASMFMT_##nr(args) : "memory", "cc");			      \

    (int) resultvar; })

#  endif

# endif /* GCC 5  */

#else

# ifdef OPTIMIZE_FOR_GCC_5

#  define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "int $0x80"								\

    : "=a" (resultvar)							\

    : "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc")

#  define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									\

    register unsigned int resultvar;					\

    LOADREGS_##nr(args)							\

    asm volatile (							\

    "int $0x80"								\

    : "=a" (resultvar)							\

    : "a" (name) ASMARGS_##nr(args) : "memory", "cc");			\

    (int) resultvar; })

# else /* GCC 5  */

#  define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "movl %1, %%eax\n\t"						      \

    "int $0x80\n\t"							      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc")

#  define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \

  ({									      \

    register unsigned int resultvar;					      \

    EXTRAVAR_##nr							      \

    asm volatile (							      \

    LOADARGS_##nr							      \

    "int $0x80\n\t"							      \

    RESTOREARGS_##nr							      \

    : "=a" (resultvar)							      \

    : "0" (name) ASMFMT_##nr(args) : "memory", "cc");			      \

    (int) resultvar; })

# endif /* GCC 5  */

#endif

#undef INTERNAL_SYSCALL_DECL

#define INTERNAL_SYSCALL_DECL(err) do { } while (0)

#undef INTERNAL_SYSCALL_ERROR_P

#define INTERNAL_SYSCALL_ERROR_P(val, err) \

  ((unsigned int) (val) >= 0xfffff001u)

#undef INTERNAL_SYSCALL_ERRNO

#define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))

#define LOADARGS_0

#ifdef __PIC__

# if I386_USE_SYSENTER && defined PIC

#  define LOADARGS_1 \

    "bpushl .L__X'%k3, %k3\n\t"

#  define LOADARGS_5 \

    "movl %%ebx, %4\n\t"						      \

    "movl %3, %%ebx\n\t"

# else

#  define LOADARGS_1 \

    "bpushl .L__X'%k2, %k2\n\t"

#  define LOADARGS_5 \

    "movl %%ebx, %3\n\t"						      \

    "movl %2, %%ebx\n\t"

# endif

# define LOADARGS_2	LOADARGS_1

# define LOADARGS_3 \

    "xchgl %%ebx, %%edi\n\t"

# define LOADARGS_4	LOADARGS_3

#else

# define LOADARGS_1

# define LOADARGS_2

# define LOADARGS_3

# define LOADARGS_4

# define LOADARGS_5

#endif

#define RESTOREARGS_0

#ifdef __PIC__

# if I386_USE_SYSENTER && defined PIC

#  define RESTOREARGS_1 \

    "bpopl .L__X'%k3, %k3\n\t"

#  define RESTOREARGS_5 \

    "movl %4, %%ebx"

# else

#  define RESTOREARGS_1 \

    "bpopl .L__X'%k2, %k2\n\t"

#  define RESTOREARGS_5 \

    "movl %3, %%ebx"

# endif

# define RESTOREARGS_2	RESTOREARGS_1

# define RESTOREARGS_3 \

    "xchgl %%edi, %%ebx\n\t"

# define RESTOREARGS_4	RESTOREARGS_3

#else

# define RESTOREARGS_1

# define RESTOREARGS_2

# define RESTOREARGS_3

# define RESTOREARGS_4

# define RESTOREARGS_5

#endif

#ifdef OPTIMIZE_FOR_GCC_5

# define LOADREGS_0()

# define ASMARGS_0()

# define LOADREGS_1(arg1) \

	LOADREGS_0 ()

# define ASMARGS_1(arg1) \

	ASMARGS_0 (), "b" ((unsigned int) (arg1))

# define LOADREGS_2(arg1, arg2) \

	LOADREGS_1 (arg1)

# define ASMARGS_2(arg1, arg2) \

	ASMARGS_1 (arg1), "c" ((unsigned int) (arg2))

# define LOADREGS_3(arg1, arg2, arg3) \

	LOADREGS_2 (arg1, arg2)

# define ASMARGS_3(arg1, arg2, arg3) \

	ASMARGS_2 (arg1, arg2), "d" ((unsigned int) (arg3))

# define LOADREGS_4(arg1, arg2, arg3, arg4) \

	LOADREGS_3 (arg1, arg2, arg3)

# define ASMARGS_4(arg1, arg2, arg3, arg4) \

	ASMARGS_3 (arg1, arg2, arg3), "S" ((unsigned int) (arg4))

# define LOADREGS_5(arg1, arg2, arg3, arg4, arg5) \

	LOADREGS_4 (arg1, arg2, arg3, arg4)

# define ASMARGS_5(arg1, arg2, arg3, arg4, arg5) \

	ASMARGS_4 (arg1, arg2, arg3, arg4), "D" ((unsigned int) (arg5))

# define LOADREGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \

	register unsigned int _a6 asm ("ebp") = (unsigned int) (arg6); \

	LOADREGS_5 (arg1, arg2, arg3, arg4, arg5)

# define ASMARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \

	ASMARGS_5 (arg1, arg2, arg3, arg4, arg5), "r" (_a6)

#endif /* GCC 5  */

#define ASMFMT_0()

#ifdef __PIC__

# define ASMFMT_1(arg1) \

	, "cd" (arg1)

# define ASMFMT_2(arg1, arg2) \

	, "d" (arg1), "c" (arg2)

# define ASMFMT_3(arg1, arg2, arg3) \

	, "D" (arg1), "c" (arg2), "d" (arg3)

# define ASMFMT_4(arg1, arg2, arg3, arg4) \

	, "D" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)

# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \

	, "0" (arg1), "m" (_xv), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)

#else

# define ASMFMT_1(arg1) \

	, "b" (arg1)

# define ASMFMT_2(arg1, arg2) \

	, "b" (arg1), "c" (arg2)

# define ASMFMT_3(arg1, arg2, arg3) \

	, "b" (arg1), "c" (arg2), "d" (arg3)

# define ASMFMT_4(arg1, arg2, arg3, arg4) \

	, "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)

# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \

	, "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)

#endif

#define EXTRAVAR_0

#define EXTRAVAR_1

#define EXTRAVAR_2

#define EXTRAVAR_3

#define EXTRAVAR_4

#ifdef __PIC__

# define EXTRAVAR_5 int _xv;

#else

# define EXTRAVAR_5

#endif

/* Consistency check for position-independent code.  */

#if defined __PIC__ && !defined OPTIMIZE_FOR_GCC_5

# define check_consistency()						      \

  ({ int __res;								      \

     __asm__ __volatile__						      \

       (LOAD_PIC_REG_STR (cx) ";"					      \

	"subl %%ebx, %%ecx;"						      \

	"je 1f;"							      \

	"ud2;"								      \

	"1:\n"								      \

	: "=c" (__res));						      \

     __res; })

#endif

#endif	/* __ASSEMBLER__ */

/* Pointer mangling support.  */

#if IS_IN (rtld)

/* We cannot use the thread descriptor because in ld.so we use setjmp

   earlier than the descriptor is initialized.  Using a global variable

   is too complicated here since we have no PC-relative addressing mode.  */

#else

# ifdef __ASSEMBLER__

#  define PTR_MANGLE(reg)	xorl %gs:POINTER_GUARD, reg;		      \

				roll $9, reg

#  define PTR_DEMANGLE(reg)	rorl $9, reg;				      \

				xorl %gs:POINTER_GUARD, reg

# else

#  define PTR_MANGLE(var)	asm ("xorl %%gs:%c2, %0\n"		      \

				     "roll $9, %0"			      \

				     : "=r" (var)			      \

				     : "0" (var),			      \

				       "i" (offsetof (tcbhead_t,	      \

						      pointer_guard)))

#  define PTR_DEMANGLE(var)	asm ("rorl $9, %0\n"			      \

				     "xorl %%gs:%c2, %0"		      \

				     : "=r" (var)			      \

				     : "0" (var),			      \

				       "i" (offsetof (tcbhead_t,	      \

						      pointer_guard)))

# endif

#endif

/* Each shadow stack slot takes 4 bytes.  Assuming that each stack

   frame takes 128 bytes, this is used to compute shadow stack size

   from stack size.  */

#define STACK_SIZE_TO_SHADOW_STACK_SIZE_SHIFT 5

#endif /* linux/i386/sysdep.h */