1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2016, Chris Smart, IBM Corporation. 4 * 5 * Calls to copy_first which are not 128-byte aligned should be 6 * caught and sent a SIGBUS. 7 */ 8 9 #include <signal.h> 10 #include <string.h> 11 #include <unistd.h> 12 #include "utils.h" 13 #include "instructions.h" 14 15 unsigned int expected_instruction = PPC_INST_COPY_FIRST; 16 unsigned int instruction_mask = 0xfc2007fe; 17 18 void signal_action_handler(int signal_num, siginfo_t *info, void *ptr) 19 { 20 ucontext_t *ctx = ptr; 21 #ifdef __powerpc64__ 22 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP]; 23 #else 24 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP]; 25 #endif 26 27 /* 28 * Check that the signal was on the correct instruction, using a 29 * mask because the compiler assigns the register at RB. 30 */ 31 if ((*pc & instruction_mask) == expected_instruction) 32 _exit(0); /* We hit the right instruction */ 33 34 _exit(1); 35 } 36 37 void setup_signal_handler(void) 38 { 39 struct sigaction signal_action; 40 41 memset(&signal_action, 0, sizeof(signal_action)); 42 signal_action.sa_sigaction = signal_action_handler; 43 signal_action.sa_flags = SA_SIGINFO; 44 sigaction(SIGBUS, &signal_action, NULL); 45 } 46 47 char cacheline_buf[128] __cacheline_aligned; 48 49 int test_copy_first_unaligned(void) 50 { 51 /* Only run this test on a P9 or later */ 52 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00)); 53 54 /* Register our signal handler with SIGBUS */ 55 setup_signal_handler(); 56 57 /* +1 makes buf unaligned */ 58 copy_first(cacheline_buf+1); 59 60 /* We should not get here */ 61 return 1; 62 } 63 64 int main(int argc, char *argv[]) 65 { 66 return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned"); 67 } 68