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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2016, Cyril Bur, IBM Corp.
   4 *
   5 * Test the kernel's signal frame code.
   6 *
   7 * The kernel sets up two sets of ucontexts if the signal was to be
   8 * delivered while the thread was in a transaction.
   9 * Expected behaviour is that the checkpointed state is in the user
  10 * context passed to the signal handler. The speculated state can be
  11 * accessed with the uc_link pointer.
  12 *
  13 * The rationale for this is that if TM unaware code (which linked
  14 * against TM libs) installs a signal handler it will not know of the
  15 * speculative nature of the 'live' registers and may infer the wrong
  16 * thing.
  17 */
  18
  19#include <stdlib.h>
  20#include <stdio.h>
  21#include <string.h>
  22#include <signal.h>
  23#include <unistd.h>
  24
  25#include <altivec.h>
  26
  27#include "utils.h"
  28#include "tm.h"
  29
  30#define MAX_ATTEMPT 500000
  31
  32#define NV_VMX_REGS 12
  33
  34long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
  35
  36static sig_atomic_t fail;
  37
  38vector int vms[] = {
  39        {1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
  40        {13,14,15,16},{17,18,19,20},{21,22,23,24},
  41        {25,26,27,28},{29,30,31,32},{33,34,35,36},
  42        {37,38,39,40},{41,42,43,44},{45,46,47,48},
  43        {-1, -2, -3, -4}, {-5, -6, -7, -8}, {-9, -10,-11,-12},
  44        {-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
  45        {-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
  46        {-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
  47};
  48
  49static void signal_usr1(int signum, siginfo_t *info, void *uc)
  50{
  51        int i;
  52        ucontext_t *ucp = uc;
  53        ucontext_t *tm_ucp = ucp->uc_link;
  54
  55        for (i = 0; i < NV_VMX_REGS && !fail; i++) {
  56                fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[i + 20],
  57                                &vms[i], sizeof(vector int));
  58                fail |= memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[i + 20],
  59                                &vms[i + NV_VMX_REGS], sizeof (vector int));
  60
  61                if (fail) {
  62                        int j;
  63
  64                        fprintf(stderr, "Failed on %d vmx 0x", i);
  65                        for (j = 0; j < 4; j++)
  66                                fprintf(stderr, "%04x", ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
  67                        fprintf(stderr, " vs 0x");
  68                        for (j = 0 ; j < 4; j++)
  69                                fprintf(stderr, "%04x", tm_ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
  70                        fprintf(stderr, "\n");
  71                }
  72        }
  73}
  74
  75static int tm_signal_context_chk()
  76{
  77        struct sigaction act;
  78        int i;
  79        long rc;
  80        pid_t pid = getpid();
  81
  82        SKIP_IF(!have_htm());
  83
  84        act.sa_sigaction = signal_usr1;
  85        sigemptyset(&act.sa_mask);
  86        act.sa_flags = SA_SIGINFO;
  87        if (sigaction(SIGUSR1, &act, NULL) < 0) {
  88                perror("sigaction sigusr1");
  89                exit(1);
  90        }
  91
  92        i = 0;
  93        while (i < MAX_ATTEMPT && !fail) {
  94                rc = tm_signal_self_context_load(pid, NULL, NULL, vms, NULL);
  95                FAIL_IF(rc != pid);
  96                i++;
  97        }
  98
  99        return fail;
 100}
 101
 102int main(void)
 103{
 104        return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vmx");
 105}
 106