sysdeps/s390/s390-32/sysdep.h

   1 /* Assembler macros for s390.
   2    Copyright (C) 2000, 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   lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \
  52   lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \
  53   basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ;
  54 #else
  55 #define CALL_MCOUNT \
  56   lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \
  57   l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \
  58   .data ; .align 4 ; 0: .long 0 ; .text ;
  59 #endif
  60 #else
  61 #define CALL_MCOUNT             /* Do nothing.  */
  62 #endif
  63
  64 /* Since C identifiers are not normally prefixed with an underscore
  65    on this system, the asm identifier `syscall_error' intrudes on the
  66    C name space.  Make sure we use an innocuous name.  */
  67 #define syscall_error   __syscall_error
  68 #define mcount          _mcount
  69
  70 #define PSEUDO(name, syscall_name, args) \
  71 lose: SYSCALL_PIC_SETUP                         \
  72     basr %r1,0;                                 \
  73 0:  al %r1,1f-0b(%r1);                          \
  74     br %r1;                                     \
  75 1:  .long JUMPTARGET(syscall_error) - 0b;       \
  76     .globl syscall_error;                       \
  77     ENTRY (name)                                \
  78     DO_CALL (syscall_name, args);               \
  79     jm lose
  80
  81 #undef  PSEUDO_END
  82 #define PSEUDO_END(name)                                                      \
  83   END (name)
  84
  85 #undef JUMPTARGET
  86 #ifdef PIC
  87 #define JUMPTARGET(name)        name##@PLT
  88 #define SYSCALL_PIC_SETUP             \
  89     bras  %r12,1f                     \
  90 0:  .long _GLOBAL_OFFSET_TABLE_-0b    \
  91 1:  al    %r12,0(%r12)
  92 #else
  93 #define JUMPTARGET(name)        name
  94 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  95 #endif
  96
  97 /* Local label name for asm code. */
  98 #ifndef L
  99 #define L(name)         .L##name
 100 #endif
 101
 102 #endif  /* __ASSEMBLER__ */