1  /* Machine-dependent definitions for profiling support.  Nios II version.
       2     Copyright (C) 1996-2023 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  
      21  #define _MCOUNT_DECL(frompc, selfpc) \
      22  static void __attribute_used__ __mcount_internal (u_long frompc, u_long selfpc)
      23  
      24  /* This macro/func MUST save r4, r5, r6, r7 and r8 because the compiler inserts
      25     blind calls to mcount(), ignoring the fact that mcount may clobber
      26     registers; therefore, mcount may NOT clobber registers.  */
      27  
      28  #if defined(__PIC__) || defined(PIC)
      29  #define NIOS2_MCOUNT_CALL				      \
      30    "nextpc r3\n\t"					      \
      31    "1: movhi r2, %hiadj(_gp_got - 1b)\n\t"		      \
      32    "addi r2, r2, %lo(_gp_got - 1b)\n\t"			      \
      33    "add r2, r2, r3\n\t"						\
      34    "ldw r2, %call(__mcount_internal)(r2)\n\t"			\
      35    "callr r2\n\t"
      36  #else
      37  #define NIOS2_MCOUNT_CALL			\
      38    "call\t__mcount_internal\n\t"
      39  #endif
      40  
      41  #define MCOUNT						\
      42    asm (".globl _mcount\n\t"				\
      43         ".type _mcount,@function\n\t"			\
      44         "_mcount:\n\t"					\
      45         "subi sp, sp, 24\n\t"				\
      46         "stw ra, 20(sp)\n\t"				\
      47         "stw r8, 16(sp)\n\t"				\
      48         "stw r7, 12(sp)\n\t"				\
      49         "stw r6, 8(sp)\n\t"				\
      50         "stw r5, 4(sp)\n\t"				\
      51         "stw r4, 0(sp)\n\t"				\
      52         "mov r4, r8\n\t"					\
      53         "mov r5, ra\n\t"					\
      54         NIOS2_MCOUNT_CALL				\
      55         "ldw ra, 20(sp)\n\t"				\
      56         "ldw r8, 16(sp)\n\t"				\
      57         "ldw r7, 12(sp)\n\t"				\
      58         "ldw r6, 8(sp)\n\t"				\
      59         "ldw r5, 4(sp)\n\t"				\
      60         "ldw r4, 0(sp)\n\t"				\
      61         "addi sp, sp, 24\n\t"				\
      62         "ret\n\t"					\
      63         ".size _mcount, . - _mcount\n\t"			\
      64         );