1  /* Copyright (C) 1997-2023 Free Software Foundation, Inc.
       2  
       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 License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     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  # define ALIGNARG(log2) log2
      26  # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
      27  
      28  /* Define an entry point visible from C.  */
      29  # define ENTRY(name)                          \
      30    .globl C_SYMBOL_NAME(name);                 \
      31    .type C_SYMBOL_NAME(name),@function;        \
      32    .align ALIGNARG(2);                         \
      33    C_LABEL(name)                               \
      34    CALL_MCOUNT
      35  
      36  # undef END
      37  # define END(name) ASM_SIZE_DIRECTIVE(name)
      38  
      39  
      40  /* If compiled for profiling, call `_mcount' at the start of each function.  */
      41  # ifdef  PROF
      42  /* The mcount code relies on a normal frame pointer being on the stack
      43     to locate our caller, so push one just for its benefit.  */
      44  #  define CALL_MCOUNT                         \
      45     addik r1,r1,-4;                            \
      46     swi r15,r1,0;                              \
      47     brlid r15,JUMPTARGET(mcount);              \
      48     nop;                                       \
      49     lwi r15,r1,0;                              \
      50     addik r1,r1,4;
      51  # else
      52  #  define CALL_MCOUNT        /* Do nothing.  */
      53  # endif
      54  
      55  /* Since C identifiers are not normally prefixed with an underscore
      56     on this system, the asm identifier `syscall_error' intrudes on the
      57     C name space.  Make sure we use an innocuous name.  */
      58  # define syscall_error   __syscall_error
      59  # define mcount      _mcount
      60  
      61  # define PSEUDO(name, syscall_name, args)     \
      62    .globl syscall_error;                       \
      63    ENTRY (name)                                \
      64      DO_CALL (syscall_name, args);
      65  
      66  # define ret                                  \
      67    rtsd r15,8; nop;
      68  
      69  # undef PSEUDO_END
      70  # define PSEUDO_END(name)                     \
      71    END (name)
      72  
      73  # undef JUMPTARGET
      74  # ifdef PIC
      75  #  define JUMPTARGET(name)   name##@PLTPC
      76  # else
      77  #  define JUMPTARGET(name)   name
      78  # endif
      79  
      80  /* Local label name for asm code.  */
      81  # ifndef L
      82  #  define L(name) $L##name
      83  # endif
      84  
      85  # endif  /* __ASSEMBLER__  */