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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2016, Chris Smart, IBM Corporation.
*
* 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");
}
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