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                 : [sprn_texasr] "i"  (SPRN_TEXASR), [cptr1] "b" (&cptr[1])
  69                 : "memory", "r0", "r1", "r3", "r4",
  70                 "r7", "r8", "r9", "r10", "r11"
  71                 );
  72
  73         if (result) {
  74                 if (!cptr[0])
  75                         goto trans;
  76
  77                 shmdt((void *)cptr);
  78                 storevsx(fp_store, 0);
  79                 ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
  80                 if (ret)
  81                         exit(1);
  82                 exit(0);
  83         }
  84         shmdt((void *)cptr);
  85         exit(1);
  86 }
  87
  88 int trace_tm_vsx(pid_t child)
  89 {
  90         unsigned long vsx[VSX_MAX];
  91         unsigned long vmx[VMX_MAX + 2][2];
  92
  93         FAIL_IF(start_trace(child));
  94         FAIL_IF(show_vsx(child, vsx));
  95         FAIL_IF(validate_vsx(vsx, fp_load));
  96         FAIL_IF(show_vmx(child, vmx));
  97         FAIL_IF(validate_vmx(vmx, fp_load));
  98         FAIL_IF(show_vsx_ckpt(child, vsx));
  99         FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
 100         FAIL_IF(show_vmx_ckpt(child, vmx));
 101         FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
 102         memset(vsx, 0, sizeof(vsx));
 103         memset(vmx, 0, sizeof(vmx));
 104
 105         load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
 106
 107         FAIL_IF(write_vsx_ckpt(child, vsx));
 108         FAIL_IF(write_vmx_ckpt(child, vmx));
 109         pptr[0] = 1;
 110         FAIL_IF(stop_trace(child));
 111         return TEST_PASS;
 112 }
 113
 114 int ptrace_tm_vsx(void)
 115 {
 116         pid_t pid;
 117         int ret, status, i;
 118
 119         SKIP_IF(!have_htm());
 120         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 121
 122         for (i = 0; i < 128; i++) {
 123                 fp_load[i] = 1 + rand();
 124                 fp_load_ckpt[i] = 1 + 2 * rand();
 125                 fp_load_ckpt_new[i] = 1 + 3 * rand();
 126         }
 127
 128         pid = fork();
 129         if (pid < 0) {
 130                 perror("fork() failed");
 131                 return TEST_FAIL;
 132         }
 133
 134         if (pid == 0)
 135                 tm_vsx();
 136
 137         if (pid) {
 138                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 139                 while (!pptr[1])
 140                         asm volatile("" : : : "memory");
 141
 142                 ret = trace_tm_vsx(pid);
 143                 if (ret) {
 144                         kill(pid, SIGKILL);
 145                         shmdt((void *)pptr);
 146                         shmctl(shm_id, IPC_RMID, NULL);
 147                         return TEST_FAIL;
 148                 }
 149
 150                 shmdt((void *)pptr);
 151                 ret = wait(&status);
 152                 shmctl(shm_id, IPC_RMID, NULL);
 153                 if (ret != pid) {
 154                         printf("Child's exit status not captured\n");
 155                         return TEST_FAIL;
 156                 }
 157
 158                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 159                         TEST_PASS;
 160         }
 161         return TEST_PASS;
 162 }
 163
 164 int main(int argc, char *argv[])
 165 {
 166         return test_harness(ptrace_tm_vsx, "ptrace_tm_vsx");
 167 }