68 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2016, Chris Smart, IBM Corporation.4 *5 * Calls to copy_first which are not 128-byte aligned should be6 * 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 15unsigned int expected_instruction = PPC_INST_COPY_FIRST;16unsigned int instruction_mask = 0xfc2007fe;17 18void 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#else24 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP];25#endif26 27 /*28 * Check that the signal was on the correct instruction, using a29 * 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 37void 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 47char cacheline_buf[128] __cacheline_aligned;48 49int 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 64int main(int argc, char *argv[])65{66 return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned");67}68