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      1 /* Copyright 2008-2025 Free Software Foundation, Inc.
      2 
      3    This file is part of GDB.
      4 
      5    This program is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by
      7    the Free Software Foundation; either version 3 of the License, or
      8    (at your option) any later version.
      9 
     10    This program 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
     13    GNU General Public License for more details.
     14 
     15    You should have received a copy of the GNU General Public License
     16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     17 
     18 #include <stdio.h>
     19 
     20 /* Start a transaction.  To avoid the need for FPR save/restore, assume
     21    that no FP- or vector registers are modified within the transaction.
     22    Thus invoke TBEGIN with the "allow floating-point operation" flag set
     23    to zero, which forces a transaction abort when hitting an FP- or vector
     24    instruction.  Also assume that TBEGIN will eventually succeed, so just
     25    retry indefinitely.  */
     26 
     27 static void
     28 my_tbegin ()
     29 {
     30   __asm__ volatile
     31     ( "1:  .byte 0xe5,0x60,0x00,0x00,0xff,0x00\n"
     32       "    jnz 1b"
     33       : /* no return value */
     34       : /* no inputs */
     35       : "cc", "memory" );
     36 }
     37 
     38 /* End a transaction.  */
     39 
     40 static void
     41 my_tend ()
     42 {
     43   __asm__ volatile
     44     ( "    .byte 0xb2,0xf8,0x00,0x00"
     45       : /* no return value */
     46       : /* no inputs */
     47       : "cc", "memory" );
     48 }
     49 
     50 void
     51 try_transaction (void)
     52 {
     53   my_tbegin ();
     54   my_tend ();
     55 }
     56 
     57 void
     58 crash_in_transaction (void)
     59 {
     60   volatile char *p = 0;
     61 
     62   my_tbegin ();
     63   *p = 5;			/* FAULT */
     64   my_tend ();
     65 }
     66 
     67 int
     68 main (int argc, char *argv[])
     69 {
     70   try_transaction ();
     71   crash_in_transaction ();
     72   return 0;
     73 }
     74