sysdeps/s390/s390-64/sysdep.h

   1 /* Assembler macros for 64 bit S/390.
   2    Copyright (C) 2001 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <sysdeps/generic/sysdep.h>
  22
  23 #ifdef  __ASSEMBLER__
  24
  25 /* Syntactic details of assembler.  */
  26
  27 #ifdef HAVE_ELF
  28
  29 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  30 #define ALIGNARG(log2) 1<<log2
  31 /* For ELF we need the `.type' directive to make shared libs work right.  */
  32 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
  33 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  34
  35 /* In ELF C symbols are asm symbols.  */
  36 #undef  NO_UNDERSCORES
  37 #define NO_UNDERSCORES
  38
  39 #else
  40
  41 #define ALIGNARG(log2) log2
  42 #define ASM_TYPE_DIRECTIVE(name,type)   /* Nothing is specified.  */
  43 #define ASM_SIZE_DIRECTIVE(name)        /* Nothing is specified.  */
  44
  45 #endif
  46
  47
  48 /* Define an entry point visible from C. */
  49 #define ENTRY(name)                                                           \
  50   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  51   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  52   .align ALIGNARG(2);                                                         \
  53   C_LABEL(name)                                                               \
  54   CALL_MCOUNT
  55
  56 #undef  END
  57 #define END(name)                                                             \
  58   ASM_SIZE_DIRECTIVE(name)                                                    \
  59
  60 /* If compiled for profiling, call `mcount' at the start of each function.  */
  61 #ifdef  PROF
  62 #ifdef PIC
  63 #define CALL_MCOUNT \
  64   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \
  65   .data ; .align 4 ; 0: .long 0 ; .text ;
  66 #else
  67 #define CALL_MCOUNT \
  68   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 14,0 ; \
  69   .data ; .align 4 ; 0: .long 0 ; .text ;
  70 #endif
  71 #else
  72 #define CALL_MCOUNT             /* Do nothing.  */
  73 #endif
  74
  75 #ifdef  NO_UNDERSCORES
  76 /* Since C identifiers are not normally prefixed with an underscore
  77    on this system, the asm identifier `syscall_error' intrudes on the
  78    C name space.  Make sure we use an innocuous name.  */
  79 #define syscall_error   __syscall_error
  80 #define mcount          _mcount
  81 #endif
  82
  83 #define PSEUDO(name, syscall_name, args)                                      \
  84 lose: SYSCALL_PIC_SETUP                                                       \
  85   JUMPTARGET(syscall_error)                                                   \
  86   .globl syscall_error;                                                       \
  87   ENTRY (name)                                                                \
  88   DO_CALL (syscall_name, args);                                               \
  89   jm lose
  90
  91 #undef  PSEUDO_END
  92 #define PSEUDO_END(name)                                                      \
  93   END (name)
  94
  95 #ifdef PIC
  96 #define JUMPTARGET(name)  \
  97     brasl name##@PLT
  98 #define SYSCALL_PIC_SETUP \
  99     larl  %r12,_GLOBAL_OFFSET_TABLE_
 100 #else
 101 #define JUMPTARGET(name)  \
 102     brasl name
 103 #define SYSCALL_PIC_SETUP       /* Nothing.  */
 104 #endif
 105
 106 /* Local label name for asm code. */
 107 #ifndef L
 108 #define L(name)         name
 109 #endif
 110
 111 #endif  /* __ASSEMBLER__ */
 112