tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c

   1 /*
   2  * Ptrace test for VMX/VSX registers in the TM Suspend context
   3  *
   4  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #include "ptrace.h"
  12 #include "tm.h"
  13 #include "ptrace-vsx.h"
  14
  15 int shm_id;
  16 int *cptr, *pptr;
  17
  18 unsigned long fp_load[VEC_MAX];
  19 unsigned long fp_load_new[VEC_MAX];
  20 unsigned long fp_store[VEC_MAX];
  21 unsigned long fp_load_ckpt[VEC_MAX];
  22 unsigned long fp_load_ckpt_new[VEC_MAX];
  23
  24 __attribute__((used)) void load_vsx(void)
  25 {
  26         loadvsx(fp_load, 0);
  27 }
  28
  29 __attribute__((used)) void load_vsx_new(void)
  30 {
  31         loadvsx(fp_load_new, 0);
  32 }
  33
  34 __attribute__((used)) void load_vsx_ckpt(void)
  35 {
  36         loadvsx(fp_load_ckpt, 0);
  37 }
  38
  39 __attribute__((used)) void wait_parent(void)
  40 {
  41         cptr[2] = 1;
  42         while (!cptr[1])
  43                 asm volatile("" : : : "memory");
  44 }
  45
  46 void tm_spd_vsx(void)
  47 {
  48         unsigned long result, texasr;
  49         int ret;
  50
  51         cptr = (int *)shmat(shm_id, NULL, 0);
  52
  53 trans:
  54         cptr[2] = 0;
  55         asm __volatile__(
  56                 "bl load_vsx_ckpt;"
  57
  58                 "1: ;"
  59                 "tbegin.;"
  60                 "beq 2f;"
  61
  62                 "bl load_vsx_new;"
  63                 "tsuspend.;"
  64                 "bl load_vsx;"
  65                 "bl wait_parent;"
  66                 "tresume.;"
  67
  68                 "tend.;"
  69                 "li 0, 0;"
  70                 "ori %[res], 0, 0;"
  71                 "b 3f;"
  72
  73                 "2: ;"
  74                 "li 0, 1;"
  75                 "ori %[res], 0, 0;"
  76                 "mfspr %[texasr], %[sprn_texasr];"
  77
  78                 "3: ;"
  79                 : [res] "=r" (result), [texasr] "=r" (texasr)
  80                 : [fp_load] "r" (fp_load), [fp_load_ckpt] "r" (fp_load_ckpt),
  81                 [sprn_texasr] "i"  (SPRN_TEXASR)
  82                 : "memory", "r0", "r1", "r2", "r3", "r4",
  83                 "r8", "r9", "r10", "r11"
  84                 );
  85
  86         if (result) {
  87                 if (!cptr[0])
  88                         goto trans;
  89                 shmdt((void *)cptr);
  90
  91                 storevsx(fp_store, 0);
  92                 ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
  93                 if (ret)
  94                         exit(1);
  95                 exit(0);
  96         }
  97         shmdt((void *)cptr);
  98         exit(1);
  99 }
 100
 101 int trace_tm_spd_vsx(pid_t child)
 102 {
 103         unsigned long vsx[VSX_MAX];
 104         unsigned long vmx[VMX_MAX + 2][2];
 105
 106         FAIL_IF(start_trace(child));
 107         FAIL_IF(show_vsx(child, vsx));
 108         FAIL_IF(validate_vsx(vsx, fp_load));
 109         FAIL_IF(show_vmx(child, vmx));
 110         FAIL_IF(validate_vmx(vmx, fp_load));
 111         FAIL_IF(show_vsx_ckpt(child, vsx));
 112         FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
 113         FAIL_IF(show_vmx_ckpt(child, vmx));
 114         FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
 115
 116         memset(vsx, 0, sizeof(vsx));
 117         memset(vmx, 0, sizeof(vmx));
 118
 119         load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
 120
 121         FAIL_IF(write_vsx_ckpt(child, vsx));
 122         FAIL_IF(write_vmx_ckpt(child, vmx));
 123
 124         pptr[0] = 1;
 125         pptr[1] = 1;
 126         FAIL_IF(stop_trace(child));
 127
 128         return TEST_PASS;
 129 }
 130
 131 int ptrace_tm_spd_vsx(void)
 132 {
 133         pid_t pid;
 134         int ret, status, i;
 135
 136         SKIP_IF(!have_htm());
 137         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 138
 139         for (i = 0; i < 128; i++) {
 140                 fp_load[i] = 1 + rand();
 141                 fp_load_new[i] = 1 + 2 * rand();
 142                 fp_load_ckpt[i] = 1 + 3 * rand();
 143                 fp_load_ckpt_new[i] = 1 + 4 * rand();
 144         }
 145
 146         pid = fork();
 147         if (pid < 0) {
 148                 perror("fork() failed");
 149                 return TEST_FAIL;
 150         }
 151
 152         if (pid == 0)
 153                 tm_spd_vsx();
 154
 155         if (pid) {
 156                 pptr = (int *)shmat(shm_id, NULL, 0);
 157                 while (!pptr[2])
 158                         asm volatile("" : : : "memory");
 159
 160                 ret = trace_tm_spd_vsx(pid);
 161                 if (ret) {
 162                         kill(pid, SIGKILL);
 163                         shmdt((void *)pptr);
 164                         shmctl(shm_id, IPC_RMID, NULL);
 165                         return TEST_FAIL;
 166                 }
 167
 168                 shmdt((void *)pptr);
 169                 ret = wait(&status);
 170                 shmctl(shm_id, IPC_RMID, NULL);
 171                 if (ret != pid) {
 172                         printf("Child's exit status not captured\n");
 173                         return TEST_FAIL;
 174                 }
 175
 176                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 177                         TEST_PASS;
 178         }
 179         return TEST_PASS;
 180 }
 181
 182 int main(int argc, char *argv[])
 183 {
 184         return test_harness(ptrace_tm_spd_vsx, "ptrace_tm_spd_vsx");
 185 }