/* Assembler macros for s390.

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).

   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/generic/sysdep.h>

#ifdef	__ASSEMBLER__

/* Syntactic details of assembler.  */

/* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */

#define ALIGNARG(log2) 1<

#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;

/* Define an entry point visible from C. */

#define	ENTRY(name)							      \

  .globl C_SYMBOL_NAME(name);						      \

  .type C_SYMBOL_NAME(name),@function;					      \

  .align ALIGNARG(2);							      \

  C_LABEL(name)								      \

  cfi_startproc;							      \

  CALL_MCOUNT

#undef	END

#define END(name)							      \

  cfi_endproc;								      \

  ASM_SIZE_DIRECTIVE(name)						      \

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

#ifdef	PROF

#ifdef PIC

#define CALL_MCOUNT \

  lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \

  lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \

  basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ;

#else

#define CALL_MCOUNT \

  lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \

  l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \

  .data ; .align 4 ; 0: .long 0 ; .text ;

#endif

#else

#define CALL_MCOUNT		/* Do nothing.  */

#endif

/* Since C identifiers are not normally prefixed with an underscore

   on this system, the asm identifier `syscall_error' intrudes on the

   C name space.  Make sure we use an innocuous name.  */

#define	syscall_error	__syscall_error

#define mcount		_mcount

#undef PSEUDO

#define	PSEUDO(name, syscall_name, args) \

lose: SYSCALL_PIC_SETUP				\

    basr %r1,0;					\

0:  al %r1,1f-0b(%r1);				\

    br %r1;					\

1:  .long JUMPTARGET(syscall_error) - 0b;	\

    .globl syscall_error;			\

    ENTRY (name)				\

    DO_CALL (syscall_name, args);		\

    jm lose

#undef	PSEUDO_END

#define	PSEUDO_END(name)						      \

  END (name)

#undef JUMPTARGET

#ifdef SHARED

#define JUMPTARGET(name)	name##@PLT

#define SYSCALL_PIC_SETUP             \

    bras  %r12,1f;		      \

0:  .long _GLOBAL_OFFSET_TABLE_-0b;   \

1:  al    %r12,0(%r12)

#else

#define JUMPTARGET(name)	name

#define SYSCALL_PIC_SETUP	/* Nothing.  */

#endif

/* Local label name for asm code. */

#ifndef L

#define L(name)		.L##name

#endif

#endif	/* __ASSEMBLER__ */