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

   1 /*
   2  * Ptrace test for VMX/VSX registers in the TM 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 unsigned long *cptr, *pptr;
  17
  18 unsigned long fp_load[VEC_MAX];
  19 unsigned long fp_store[VEC_MAX];
  20 unsigned long fp_load_ckpt[VEC_MAX];
  21 unsigned long fp_load_ckpt_new[VEC_MAX];
  22
  23 __attribute__((used)) void load_vsx(void)
  24 {
  25         loadvsx(fp_load, 0);
  26 }
  27
  28 __attribute__((used)) void load_vsx_ckpt(void)
  29 {
  30         loadvsx(fp_load_ckpt, 0);
  31 }
  32
  33 void tm_vsx(void)
  34 {
  35         unsigned long result, texasr;
  36         int ret;
  37
  38         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  39
  40 trans:
  41         cptr[1] = 0;
  42         asm __volatile__(
  43                 "bl load_vsx_ckpt;"
  44
  45                 "1: ;"
  46                 "tbegin.;"
  47                 "beq 2f;"
  48
  49                 "bl load_vsx;"
  50                 "tsuspend.;"
  51                 "li 7, 1;"
  52                 "stw 7, 0(%[cptr1]);"
  53                 "tresume.;"
  54                 "b .;"
  55
  56                 "tend.;"
  57                 "li 0, 0;"
  58                 "ori %[res], 0, 0;"
  59                 "b 3f;"
  60
  61                 "2: ;"
  62                 "li 0, 1;"
  63                 "ori %[res], 0, 0;"
  64                 "mfspr %[texasr], %[sprn_texasr];"
  65
  66                 "3: ;"
  67                 : [res] "=r" (result), [texasr] "=r" (texasr)
  68                 : [fp_load] "r" (fp_load), [fp_load_ckpt] "r" (fp_load_ckpt),
  69                 [sprn_texasr] "i"  (SPRN_TEXASR), [cptr1] "r" (&cptr[1])
  70                 : "memory", "r0", "r1", "r2", "r3", "r4",
  71                 "r7", "r8", "r9", "r10", "r11"
  72                 );
  73
  74         if (result) {
  75                 if (!cptr[0])
  76                         goto trans;
  77
  78                 shmdt((void *)cptr);
  79                 storevsx(fp_store, 0);
  80                 ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
  81                 if (ret)
  82                         exit(1);
  83                 exit(0);
  84         }
  85         shmdt((void *)cptr);
  86         exit(1);
  87 }
  88
  89 int trace_tm_vsx(pid_t child)
  90 {
  91         unsigned long vsx[VSX_MAX];
  92         unsigned long vmx[VMX_MAX + 2][2];
  93
  94         FAIL_IF(start_trace(child));
  95         FAIL_IF(show_vsx(child, vsx));
  96         FAIL_IF(validate_vsx(vsx, fp_load));
  97         FAIL_IF(show_vmx(child, vmx));
  98         FAIL_IF(validate_vmx(vmx, fp_load));
  99         FAIL_IF(show_vsx_ckpt(child, vsx));
 100         FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
 101         FAIL_IF(show_vmx_ckpt(child, vmx));
 102         FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
 103         memset(vsx, 0, sizeof(vsx));
 104         memset(vmx, 0, sizeof(vmx));
 105
 106         load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
 107
 108         FAIL_IF(write_vsx_ckpt(child, vsx));
 109         FAIL_IF(write_vmx_ckpt(child, vmx));
 110         pptr[0] = 1;
 111         FAIL_IF(stop_trace(child));
 112         return TEST_PASS;
 113 }
 114
 115 int ptrace_tm_vsx(void)
 116 {
 117         pid_t pid;
 118         int ret, status, i;
 119
 120         SKIP_IF(!have_htm());
 121         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 122
 123         for (i = 0; i < 128; i++) {
 124                 fp_load[i] = 1 + rand();
 125                 fp_load_ckpt[i] = 1 + 2 * rand();
 126                 fp_load_ckpt_new[i] = 1 + 3 * rand();
 127         }
 128
 129         pid = fork();
 130         if (pid < 0) {
 131                 perror("fork() failed");
 132                 return TEST_FAIL;
 133         }
 134
 135         if (pid == 0)
 136                 tm_vsx();
 137
 138         if (pid) {
 139                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 140                 while (!pptr[1])
 141                         asm volatile("" : : : "memory");
 142
 143                 ret = trace_tm_vsx(pid);
 144                 if (ret) {
 145                         kill(pid, SIGKILL);
 146                         shmdt((void *)pptr);
 147                         shmctl(shm_id, IPC_RMID, NULL);
 148                         return TEST_FAIL;
 149                 }
 150
 151                 shmdt((void *)pptr);
 152                 ret = wait(&status);
 153                 shmctl(shm_id, IPC_RMID, NULL);
 154                 if (ret != pid) {
 155                         printf("Child's exit status not captured\n");
 156                         return TEST_FAIL;
 157                 }
 158
 159                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 160                         TEST_PASS;
 161         }
 162         return TEST_PASS;
 163 }
 164
 165 int main(int argc, char *argv[])
 166 {
 167         return test_harness(ptrace_tm_vsx, "ptrace_tm_vsx");
 168 }