sysdeps/powerpc/powerpc64/ppc-mcount.S

   1 /* PowerPC64-specific implementation of profiling support.
   2    Copyright (C) 1997-2021 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 <sysdep.h>
  20 /* We don't need to save the parameter-passing registers as gcc takes
  21    care of that for us.  Thus this function looks fairly normal.
  22    In fact, the generic code would work for us.  */
  23
  24 ENTRY(_mcount)
  25         mflr             r4
  26         ld               r11, 0(r1)
  27         std              r4, FRAME_LR_SAVE(r1)
  28         stdu             r1,-FRAME_MIN_SIZE(r1)
  29         cfi_adjust_cfa_offset (FRAME_MIN_SIZE)
  30         cfi_offset (lr, FRAME_LR_SAVE)
  31         ld               r3, FRAME_LR_SAVE(r11)
  32         bl               JUMPTARGET (NOTOC (__mcount_internal))
  33 #ifndef SHARED
  34         nop
  35 #endif
  36         ld               r0, FRAME_MIN_SIZE+FRAME_LR_SAVE(r1)
  37         mtlr             r0
  38         addi             r1,r1,FRAME_MIN_SIZE
  39         blr
  40 END(_mcount)