sysdeps/s390/s390-64/sysdep.h

   1 /* Assembler macros for 64 bit S/390.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdeps/generic/sysdep.h>
  21
  22 #ifdef  __ASSEMBLER__
  23
  24 /* Syntactic details of assembler.  */
  25
  26 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  27 #define ALIGNARG(log2) 1<<log2
  28 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  29
  30
  31 /* Define an entry point visible from C. */
  32 #define ENTRY(name)                                                           \
  33   .globl C_SYMBOL_NAME(name);                                                 \
  34   .type C_SYMBOL_NAME(name),@function;                                        \
  35   .align ALIGNARG(2);                                                         \
  36   C_LABEL(name)                                                               \
  37   cfi_startproc;                                                              \
  38   CALL_MCOUNT
  39
  40 #undef  END
  41 #define END(name)                                                             \
  42   cfi_endproc;                                                                \
  43   ASM_SIZE_DIRECTIVE(name)                                                    \
  44
  45 /* If compiled for profiling, call `mcount' at the start of each function.  */
  46 #ifdef  PROF
  47 #ifdef PIC
  48 #define CALL_MCOUNT \
  49   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \
  50   .data ; .align 4 ; 0: .long 0 ; .text ;
  51 #else
  52 #define CALL_MCOUNT \
  53   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 14,0 ; \
  54   .data ; .align 4 ; 0: .long 0 ; .text ;
  55 #endif
  56 #else
  57 #define CALL_MCOUNT             /* Do nothing.  */
  58 #endif
  59
  60 /* Since C identifiers are not normally prefixed with an underscore
  61    on this system, the asm identifier `syscall_error' intrudes on the
  62    C name space.  Make sure we use an innocuous name.  */
  63 #define syscall_error   __syscall_error
  64 #define mcount          _mcount
  65
  66 #undef PSEUDO
  67 #define PSEUDO(name, syscall_name, args) \
  68 lose: SYSCALL_PIC_SETUP                 \
  69   jg JUMPTARGET(syscall_error);         \
  70   .globl syscall_error;                 \
  71   ENTRY (name)                          \
  72   DO_CALL (syscall_name, args);         \
  73   jm lose
  74
  75 #undef  PSEUDO_END
  76 #define PSEUDO_END(name)                                                      \
  77   END (name)
  78
  79 #undef JUMPTARGET
  80 #ifdef PIC
  81 #define JUMPTARGET(name)        name##@PLT
  82 #define SYSCALL_PIC_SETUP \
  83     larl  %r12,_GLOBAL_OFFSET_TABLE_
  84 #else
  85 #define JUMPTARGET(name)        name
  86 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  87 #endif
  88
  89 /* Local label name for asm code. */
  90 #ifndef L
  91 #define L(name)         .L##name
  92 #endif
  93
  94 #endif  /* __ASSEMBLER__ */