sysdeps/s390/s390-32/sysdep.h

   1 /* Assembler macros for s390.
   2    Copyright (C) 2000-2014 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   lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \
  50   lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \
  51   basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ;
  52 #else
  53 #define CALL_MCOUNT \
  54   lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \
  55   l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 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 #undef PSEUDO
  69 #define PSEUDO(name, syscall_name, args) \
  70 lose: SYSCALL_PIC_SETUP                         \
  71     basr %r1,0;                                 \
  72 0:  al %r1,1f-0b(%r1);                          \
  73     br %r1;                                     \
  74 1:  .long JUMPTARGET(syscall_error) - 0b;       \
  75     .globl syscall_error;                       \
  76     ENTRY (name)                                \
  77     DO_CALL (syscall_name, args);               \
  78     jm lose
  79
  80 #undef  PSEUDO_END
  81 #define PSEUDO_END(name)                                                      \
  82   END (name)
  83
  84 #undef JUMPTARGET
  85 #ifdef PIC
  86 #define JUMPTARGET(name)        name##@PLT
  87 #define SYSCALL_PIC_SETUP             \
  88     bras  %r12,1f                     \
  89 0:  .long _GLOBAL_OFFSET_TABLE_-0b    \
  90 1:  al    %r12,0(%r12)
  91 #else
  92 #define JUMPTARGET(name)        name
  93 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  94 #endif
  95
  96 /* Local label name for asm code. */
  97 #ifndef L
  98 #define L(name)         .L##name
  99 #endif
 100
 101 #endif  /* __ASSEMBLER__ */