sysdeps/s390/s390-64/sysdep.h

   1 /* Assembler macros for 64 bit S/390.
   2    Copyright (C) 2001-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdeps/generic/sysdep.h>
  20
  21 #ifdef  __ASSEMBLER__
  22
  23 /* Syntactic details of assembler.  */
  24
  25 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  26 #define ALIGNARG(log2) 1<<log2
  27 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  28
  29
  30 /* Define an entry point visible from C. */
  31 #define ENTRY(name)                                                           \
  32   .globl C_SYMBOL_NAME(name);                                                 \
  33   .type C_SYMBOL_NAME(name),@function;                                        \
  34   .align ALIGNARG(4);                                                         \
  35   C_LABEL(name)                                                               \
  36   cfi_startproc;                                                              \
  37   CALL_MCOUNT
  38
  39 #undef  END
  40 #define END(name)                                                             \
  41   cfi_endproc;                                                                \
  42   ASM_SIZE_DIRECTIVE(name)                                                    \
  43
  44 /* If compiled for profiling, call `mcount' at the start of each function.  */
  45 #ifdef  PROF
  46 #ifdef PIC
  47 #define CALL_MCOUNT \
  48   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \
  49   .data ; .align 4 ; 0: .long 0 ; .text ;
  50 #else
  51 #define CALL_MCOUNT \
  52   lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 14,0 ; \
  53   .data ; .align 4 ; 0: .long 0 ; .text ;
  54 #endif
  55 #else
  56 #define CALL_MCOUNT             /* Do nothing.  */
  57 #endif
  58
  59 /* Since C identifiers are not normally prefixed with an underscore
  60    on this system, the asm identifier `syscall_error' intrudes on the
  61    C name space.  Make sure we use an innocuous name.  */
  62 #define syscall_error   __syscall_error
  63 #define mcount          _mcount
  64
  65 #undef PSEUDO
  66 #define PSEUDO(name, syscall_name, args) \
  67 lose: SYSCALL_PIC_SETUP                 \
  68   jg JUMPTARGET(syscall_error);         \
  69   .globl syscall_error;                 \
  70   ENTRY (name)                          \
  71   DO_CALL (syscall_name, args);         \
  72   jm lose
  73
  74 #undef  PSEUDO_END
  75 #define PSEUDO_END(name)                                                      \
  76   END (name)
  77
  78 #undef JUMPTARGET
  79 #ifdef SHARED
  80 #define JUMPTARGET(name)        name##@PLT
  81 #define SYSCALL_PIC_SETUP \
  82     larl  %r12,_GLOBAL_OFFSET_TABLE_
  83 #else
  84 #define JUMPTARGET(name)        name
  85 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  86 #endif
  87
  88 /* Local label name for asm code. */
  89 #ifndef L
  90 #define L(name)         .L##name
  91 #endif
  92
  93 #endif  /* __ASSEMBLER__ */