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
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#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
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