text: /* Assembler macros for i386.
     Copyright (C) 1991-2021 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
     <https://www.gnu.org/licenses/>.  */
  
  #include <sysdeps/x86/sysdep.h>
  
  /* 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 .text.GET_PC_THUNK(reg),"axG",@progbits,GET_PC_THUNK(reg),comdat;  \
    .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 .text." GET_PC_THUNK_STR (reg) ",\"axG\",@progbits,"	\
      GET_PC_THUNK_STR (reg) ",comdat\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__ */
  