/* Assembler macros for i386.

   Copyright (C) 1991-2018 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 <sysdeps/x86/sysdep.h>

#include <features.h> /* For __GNUC_PREREQ.  */

/* It is desirable that the names of PIC thunks match those used by

   GCC so that multiple copies are eliminated by the linker.  Because

   GCC 4.6 and earlier use __i686 in the names, it is necessary to

   override that predefined macro.  */

#if defined __i686 && defined __ASSEMBLER__

#undef __i686

#define __i686 __i686

#endif

#ifdef	__ASSEMBLER__

# define GET_PC_THUNK(reg) __x86.get_pc_thunk.reg

#else

# define GET_PC_THUNK_STR(reg) "__x86.get_pc_thunk." #reg

#endif

#ifdef	__ASSEMBLER__

/* Syntactic details of assembler.  */

/* If compiled for profiling, call `mcount' at the start of each function.  */

#ifdef	PROF

/* The mcount code relies on a normal frame pointer being on the stack

   to locate our caller, so push one just for its benefit.  */

#define CALL_MCOUNT \

  pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \

  cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \

  popl %ebp; cfi_def_cfa (esp, 4);

#else

#define CALL_MCOUNT		/* Do nothing.  */

#endif

#define	PSEUDO(name, syscall_name, args)				      \

  .globl syscall_error;							      \

lose: SYSCALL_PIC_SETUP							      \

  jmp JUMPTARGET(syscall_error);					      \

  ENTRY (name)								      \

  DO_CALL (syscall_name, args);						      \

  jb lose

# define SETUP_PIC_REG(reg) \

  .ifndef GET_PC_THUNK(reg);						      \

  .section .gnu.linkonce.t.GET_PC_THUNK(reg),"ax",@progbits;		      \

  .globl GET_PC_THUNK(reg);						      \

  .hidden GET_PC_THUNK(reg);						      \

  .p2align 4;								      \

  .type GET_PC_THUNK(reg),@function;					      \

GET_PC_THUNK(reg):							      \

  movl (%esp), %e##reg;							      \

  ret;									      \

  .size GET_PC_THUNK(reg), . - GET_PC_THUNK(reg);			      \

  .previous;								      \

  .endif;								      \

  call GET_PC_THUNK(reg)

# define LOAD_PIC_REG(reg) \

  SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg

#undef JUMPTARGET

#ifdef PIC

#define JUMPTARGET(name)	name##@PLT

#define SYSCALL_PIC_SETUP \

    pushl %ebx;								      \

    cfi_adjust_cfa_offset (4);						      \

    call 0f;								      \

0:  popl %ebx;								      \

    cfi_adjust_cfa_offset (-4);						      \

    addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx;

#else

#define JUMPTARGET(name)	name

#define SYSCALL_PIC_SETUP	/* Nothing.  */

#endif

#else /* __ASSEMBLER__ */

# define SETUP_PIC_REG_STR(reg)						\

  ".ifndef " GET_PC_THUNK_STR (reg) "\n"				\

  ".section .gnu.linkonce.t." GET_PC_THUNK_STR (reg) ",\"ax\",@progbits\n" \

  ".globl " GET_PC_THUNK_STR (reg) "\n"					\

  ".hidden " GET_PC_THUNK_STR (reg) "\n"				\

  ".p2align 4\n"							\

  ".type " GET_PC_THUNK_STR (reg) ",@function\n"			\

GET_PC_THUNK_STR (reg) ":"						\

  "movl (%%esp), %%e" #reg "\n"						\

  "ret\n"								\

  ".size " GET_PC_THUNK_STR (reg) ", . - " GET_PC_THUNK_STR (reg) "\n"	\

  ".previous\n"								\

  ".endif\n"								\

  "call " GET_PC_THUNK_STR (reg)

# define LOAD_PIC_REG_STR(reg) \

  SETUP_PIC_REG_STR (reg) "\naddl $_GLOBAL_OFFSET_TABLE_, %%e" #reg

#endif	/* __ASSEMBLER__ */