2 * Copyright 2016, Chris Smart, IBM Corporation.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Calls to copy_first which are not 128-byte aligned should be
10 * caught and sent a SIGBUS.
18 #include "instructions.h"
20 unsigned int expected_instruction = PPC_INST_COPY_FIRST;
21 unsigned int instruction_mask = 0xfc2007fe;
23 void signal_action_handler(int signal_num, siginfo_t *info, void *ptr)
25 ucontext_t *ctx = ptr;
27 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP];
29 unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP];
33 * Check that the signal was on the correct instruction, using a
34 * mask because the compiler assigns the register at RB.
36 if ((*pc & instruction_mask) == expected_instruction)
37 _exit(0); /* We hit the right instruction */
42 void setup_signal_handler(void)
44 struct sigaction signal_action;
46 memset(&signal_action, 0, sizeof(signal_action));
47 signal_action.sa_sigaction = signal_action_handler;
48 signal_action.sa_flags = SA_SIGINFO;
49 sigaction(SIGBUS, &signal_action, NULL);
52 char cacheline_buf[128] __cacheline_aligned;
54 int test_copy_first_unaligned(void)
56 /* Only run this test on a P9 or later */
57 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));
59 /* Register our signal handler with SIGBUS */
60 setup_signal_handler();
62 /* +1 makes buf unaligned */
63 copy_first(cacheline_buf+1);
65 /* We should not get here */
69 int main(int argc, char *argv[])
71 return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned");