// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016, Chris Smart, IBM Corporation.
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*
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* Calls to copy_first which are not 128-byte aligned should be
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* caught and sent a SIGBUS.
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*/
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include "utils.h"
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#include "instructions.h"
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unsigned int expected_instruction = PPC_INST_COPY_FIRST;
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unsigned int instruction_mask = 0xfc2007fe;
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void signal_action_handler(int signal_num, siginfo_t *info, void *ptr)
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{
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ucontext_t *ctx = ptr;
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#ifdef __powerpc64__
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unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP];
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#else
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unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP];
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#endif
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/*
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* Check that the signal was on the correct instruction, using a
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* mask because the compiler assigns the register at RB.
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*/
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if ((*pc & instruction_mask) == expected_instruction)
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_exit(0); /* We hit the right instruction */
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_exit(1);
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}
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void setup_signal_handler(void)
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{
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struct sigaction signal_action;
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memset(&signal_action, 0, sizeof(signal_action));
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signal_action.sa_sigaction = signal_action_handler;
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signal_action.sa_flags = SA_SIGINFO;
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sigaction(SIGBUS, &signal_action, NULL);
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}
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char cacheline_buf[128] __cacheline_aligned;
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int test_copy_first_unaligned(void)
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{
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/* Only run this test on a P9 or later */
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SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));
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/* Register our signal handler with SIGBUS */
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setup_signal_handler();
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/* +1 makes buf unaligned */
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copy_first(cacheline_buf+1);
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/* We should not get here */
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return 1;
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}
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int main(int argc, char *argv[])
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{
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return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned");
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}
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