LXR linux/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-vmx.c

   1/*
   2 * Copyright 2016, Cyril Bur, IBM Corp.
   3 *
   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.
   8 *
   9 *
  10 * Test the kernel's signal frame code.
  11 *
  12 * The kernel sets up two sets of ucontexts if the signal was to be
  13 * delivered while the thread was in a transaction.
  14 * Expected behaviour is that the checkpointed state is in the user
  15 * context passed to the signal handler. The speculated state can be
  16 * accessed with the uc_link pointer.
  17 *
  18 * The rationale for this is that if TM unaware code (which linked
  19 * against TM libs) installs a signal handler it will not know of the
  20 * speculative nature of the 'live' registers and may infer the wrong
  21 * thing.
  22 */
  23
  24#include <stdlib.h>
  25#include <stdio.h>
  26#include <string.h>
  27#include <signal.h>
  28#include <unistd.h>
  29
  30#include <altivec.h>
  31
  32#include "utils.h"
  33#include "tm.h"
  34
  35#define MAX_ATTEMPT 500000
  36
  37#define NV_VMX_REGS 12
  38
  39long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
  40
  41static sig_atomic_t fail;
  42
  43vector int vms[] = {
  44        {1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
  45        {13,14,15,16},{17,18,19,20},{21,22,23,24},
  46        {25,26,27,28},{29,30,31,32},{33,34,35,36},
  47        {37,38,39,40},{41,42,43,44},{45,46,47,48},
  48        {-1, -2, -3, -4}, {-5, -6, -7, -8}, {-9, -10,-11,-12},
  49        {-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
  50        {-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
  51        {-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
  52};
  53
  54static void signal_usr1(int signum, siginfo_t *info, void *uc)
  55{
  56        int i;
  57        ucontext_t *ucp = uc;
  58        ucontext_t *tm_ucp = ucp->uc_link;
  59
  60        for (i = 0; i < NV_VMX_REGS && !fail; i++) {
  61                fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[i + 20],
  62                                &vms[i], sizeof(vector int));
  63                fail |= memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[i + 20],
  64                                &vms[i + NV_VMX_REGS], sizeof (vector int));
  65
  66                if (fail) {
  67                        int j;
  68
  69                        fprintf(stderr, "Failed on %d vmx 0x", i);
  70                        for (j = 0; j < 4; j++)
  71                                fprintf(stderr, "%04x", ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
  72                        fprintf(stderr, " vs 0x");
  73                        for (j = 0 ; j < 4; j++)
  74                                fprintf(stderr, "%04x", tm_ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
  75                        fprintf(stderr, "\n");
  76                }
  77        }
  78}
  79
  80static int tm_signal_context_chk()
  81{
  82        struct sigaction act;
  83        int i;
  84        long rc;
  85        pid_t pid = getpid();
  86
  87        SKIP_IF(!have_htm());
  88
  89        act.sa_sigaction = signal_usr1;
  90        sigemptyset(&act.sa_mask);
  91        act.sa_flags = SA_SIGINFO;
  92        if (sigaction(SIGUSR1, &act, NULL) < 0) {
  93                perror("sigaction sigusr1");
  94                exit(1);
  95        }
  96
  97        i = 0;
  98        while (i < MAX_ATTEMPT && !fail) {
  99                rc = tm_signal_self_context_load(pid, NULL, NULL, vms, NULL);
 100                FAIL_IF(rc != pid);
 101                i++;
 102        }
 103
 104        return fail;
 105}
 106
 107int main(void)
 108{
 109        return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vmx");
 110}
 111