1 /* 2 * Copyright 2016, Chris Smart, IBM Corporation. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Calls to copy_first which are not 128-byte aligned should be 10 * caught and sent a SIGBUS. 11 * 12 */ 13 14 #include <signal.h> 15 #include <string.h> 16 #include <unistd.h> 17 #include "utils.h" 18 #include "instructions.h" 19 20 unsigned int expected_instruction = PPC_INST_COPY_FIRST; 21 unsigned int instruction_mask = 0xfc2007fe; 22 23 void signal_action_handler(int signal_num, siginfo_t *info, void *ptr) 24 { 25 ucontext_t *ctx = ptr; 26 #ifdef __powerpc64__ 27 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP]; 28 #else 29 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP]; 30 #endif 31 32 /* 33 * Check that the signal was on the correct instruction, using a 34 * mask because the compiler assigns the register at RB. 35 */ 36 if ((*pc & instruction_mask) == expected_instruction) 37 _exit(0); /* We hit the right instruction */ 38 39 _exit(1); 40 } 41 42 void setup_signal_handler(void) 43 { 44 struct sigaction signal_action; 45 46 memset(&signal_action, 0, sizeof(signal_action)); 47 signal_action.sa_sigaction = signal_action_handler; 48 signal_action.sa_flags = SA_SIGINFO; 49 sigaction(SIGBUS, &signal_action, NULL); 50 } 51 52 char cacheline_buf[128] __cacheline_aligned; 53 54 int test_copy_first_unaligned(void) 55 { 56 /* Only run this test on a P9 or later */ 57 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00)); 58 59 /* Register our signal handler with SIGBUS */ 60 setup_signal_handler(); 61 62 /* +1 makes buf unaligned */ 63 copy_first(cacheline_buf+1); 64 65 /* We should not get here */ 66 return 1; 67 } 68 69 int main(int argc, char *argv[]) 70 { 71 return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned"); 72 } 73