1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright (C) 2018-2020 Free Software Foundation, Inc. 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 int main (void) 19 { 20 /* Touch DSCR. Some kernels won't schedule the thread with a DSCR 21 altered by ptrace unless the register was used at some point. */ 22 unsigned long dscr = 0x0; 23 24 /* This is the non-privileged SPR number to access DSCR, 25 available since isa 207. */ 26 asm volatile ("mtspr 3,%0" : : "r" (dscr)); 27 28 asm volatile ("tbegin."); // first marker 29 asm volatile goto ("bc 12,2,%l[end]" 30 : 31 : 32 : 33 : end); 34 asm volatile ("tabort. 0"); 35 end: 36 asm volatile ("nop"); // second marker 37 38 return 0; 39 } 40