/* * Copyright 2016, Chris Smart, IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Calls to copy_first which are not 128-byte aligned should be * caught and sent a SIGBUS. * */ #include <signal.h> #include <string.h> #include <unistd.h> #include "utils.h" #include "instructions.h" unsigned int expected_instruction = PPC_INST_COPY_FIRST; unsigned int instruction_mask = 0xfc2007fe; void signal_action_handler(int signal_num, siginfo_t *info, void *ptr) { ucontext_t *ctx = ptr; #ifdef __powerpc64__ unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP]; #else unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP]; #endif /* * Check that the signal was on the correct instruction, using a * mask because the compiler assigns the register at RB. */ if ((*pc & instruction_mask) == expected_instruction) _exit(0); /* We hit the right instruction */ _exit(1); } void setup_signal_handler(void) { struct sigaction signal_action; memset(&signal_action, 0, sizeof(signal_action)); signal_action.sa_sigaction = signal_action_handler; signal_action.sa_flags = SA_SIGINFO; sigaction(SIGBUS, &signal_action, NULL); } char cacheline_buf[128] __cacheline_aligned; int test_copy_first_unaligned(void) { /* Only run this test on a P9 or later */ SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00)); /* Register our signal handler with SIGBUS */ setup_signal_handler(); /* +1 makes buf unaligned */ copy_first(cacheline_buf+1); /* We should not get here */ return 1; } int main(int argc, char *argv[]) { return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned"); }