sysdeps/s390/s390-32/sysdep.h

   1 /* Assembler macros for s390.
   2    Copyright (C) 2000-2024 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   lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \
  49   lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \
  50   basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ;
  51 #else
  52 #define CALL_MCOUNT \
  53   lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \
  54   l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \
  55   .data ; .align 4 ; 0: .long 0 ; .text ;
  56 #endif
  57 #else
  58 #define CALL_MCOUNT             /* Do nothing.  */
  59 #endif
  60
  61 /* Since C identifiers are not normally prefixed with an underscore
  62    on this system, the asm identifier `syscall_error' intrudes on the
  63    C name space.  Make sure we use an innocuous name.  */
  64 #define syscall_error   __syscall_error
  65 #define mcount          _mcount
  66
  67 #undef PSEUDO
  68 #define PSEUDO(name, syscall_name, args) \
  69 lose: SYSCALL_PIC_SETUP                         \
  70     basr %r1,0;                                 \
  71 0:  al %r1,1f-0b(%r1);                          \
  72     br %r1;                                     \
  73 1:  .long JUMPTARGET(syscall_error) - 0b;       \
  74     .globl syscall_error;                       \
  75     ENTRY (name)                                \
  76     DO_CALL (syscall_name, args);               \
  77     jm lose
  78
  79 #undef  PSEUDO_END
  80 #define PSEUDO_END(name)                                                      \
  81   END (name)
  82
  83 #undef JUMPTARGET
  84 #ifdef SHARED
  85 #define JUMPTARGET(name)        name##@PLT
  86 #define SYSCALL_PIC_SETUP             \
  87     bras  %r12,1f;                    \
  88 0:  .long _GLOBAL_OFFSET_TABLE_-0b;   \
  89 1:  al    %r12,0(%r12)
  90 #else
  91 #define JUMPTARGET(name)        name
  92 #define SYSCALL_PIC_SETUP       /* Nothing.  */
  93 #endif
  94
  95 /* Local label name for asm code. */
  96 #ifndef L
  97 #define L(name)         .L##name
  98 #endif
  99
 100 #endif  /* __ASSEMBLER__ */