sysdeps/s390/s390-64/sysdep.h

   1 /* Assembler macros for 64 bit S/390.
   2    Copyright (C) 2001, 2003, 2012 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 /* For ELF we need the `.type' directive to make shared libs work right.  */
  29 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
  30 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  31
  32
  33 /* Define an entry point visible from C. */
  34 #define ENTRY(name)                                                           \
  35   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  36   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  37   .align ALIGNARG(2);                                                         \
  38   C_LABEL(name)                                                               \
  39   cfi_startproc;                                                              \
  40   CALL_MCOUNT
  41
  42 #undef  END
  43 #define END(name)                                                             \
  44   cfi_endproc;                                                                \
  45   ASM_SIZE_DIRECTIVE(name)                                                    \
  46
  47 /* If compiled for profiling, call `mcount' at the start of each function.  */
  48 #ifdef  PROF
  49 #ifdef PIC
  50 #define CALL_MCOUNT \
  51   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \
  52   .data ; .align 4 ; 0: .long 0 ; .text ;
  53 #else
  54 #define CALL_MCOUNT \
  55   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 14,0 ; \
  56   .data ; .align 4 ; 0: .long 0 ; .text ;
  57 #endif
  58 #else
  59 #define CALL_MCOUNT             /* Do nothing.  */
  60 #endif
  61
  62 /* Since C identifiers are not normally prefixed with an underscore
  63    on this system, the asm identifier `syscall_error' intrudes on the
  64    C name space.  Make sure we use an innocuous name.  */
  65 #define syscall_error   __syscall_error
  66 #define mcount          _mcount
  67
  68 #define PSEUDO(name, syscall_name, args) \
  69 lose: SYSCALL_PIC_SETUP                 \
  70   jg JUMPTARGET(syscall_error);         \
  71   .globl syscall_error;                 \
  72   ENTRY (name)                          \
  73   DO_CALL (syscall_name, args);         \
  74   jm lose
  75
  76 #undef  PSEUDO_END
  77 #define PSEUDO_END(name)                                                      \
  78   END (name)
  79
  80 #undef JUMPTARGET
  81 #ifdef PIC
  82 #define JUMPTARGET(name)        name##@PLT
  83 #define SYSCALL_PIC_SETUP \
  84     larl  %r12,_GLOBAL_OFFSET_TABLE_
  85 #else
  86 #define JUMPTARGET(name)        name
  87 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  88 #endif
  89
  90 /* Local label name for asm code. */
  91 #ifndef L
  92 #define L(name)         .L##name
  93 #endif
  94
  95 #endif  /* __ASSEMBLER__ */