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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ptrace test for VMX/VSX registers in the TM context
   4  *
   5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
   6  */
   7 #include "ptrace.h"
   8 #include "tm.h"
   9 #include "ptrace-vsx.h"
  10
  11 int shm_id;
  12 unsigned long *cptr, *pptr;
  13
  14 unsigned long fp_load[VEC_MAX];
  15 unsigned long fp_store[VEC_MAX];
  16 unsigned long fp_load_ckpt[VEC_MAX];
  17 unsigned long fp_load_ckpt_new[VEC_MAX];
  18
  19 __attribute__((used)) void load_vsx(void)
  20 {
  21         loadvsx(fp_load, 0);
  22 }
  23
  24 __attribute__((used)) void load_vsx_ckpt(void)
  25 {
  26         loadvsx(fp_load_ckpt, 0);
  27 }
  28
  29 void tm_vsx(void)
  30 {
  31         unsigned long result, texasr;
  32         int ret;
  33
  34         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  35
  36 trans:
  37         cptr[1] = 0;
  38         asm __volatile__(
  39                 "bl load_vsx_ckpt;"
  40
  41                 "1: ;"
  42                 "tbegin.;"
  43                 "beq 2f;"
  44
  45                 "bl load_vsx;"
  46                 "tsuspend.;"
  47                 "li 7, 1;"
  48                 "stw 7, 0(%[cptr1]);"
  49                 "tresume.;"
  50                 "b .;"
  51
  52                 "tend.;"
  53                 "li 0, 0;"
  54                 "ori %[res], 0, 0;"
  55                 "b 3f;"
  56
  57                 "2: ;"
  58                 "li 0, 1;"
  59                 "ori %[res], 0, 0;"
  60                 "mfspr %[texasr], %[sprn_texasr];"
  61
  62                 "3: ;"
  63                 : [res] "=r" (result), [texasr] "=r" (texasr)
  64                 : [sprn_texasr] "i"  (SPRN_TEXASR), [cptr1] "b" (&cptr[1])
  65                 : "memory", "r0", "r1", "r3", "r4",
  66                 "r7", "r8", "r9", "r10", "r11"
  67                 );
  68
  69         if (result) {
  70                 if (!cptr[0])
  71                         goto trans;
  72
  73                 shmdt((void *)cptr);
  74                 storevsx(fp_store, 0);
  75                 ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
  76                 if (ret)
  77                         exit(1);
  78                 exit(0);
  79         }
  80         shmdt((void *)cptr);
  81         exit(1);
  82 }
  83
  84 int trace_tm_vsx(pid_t child)
  85 {
  86         unsigned long vsx[VSX_MAX];
  87         unsigned long vmx[VMX_MAX + 2][2];
  88
  89         FAIL_IF(start_trace(child));
  90         FAIL_IF(show_vsx(child, vsx));
  91         FAIL_IF(validate_vsx(vsx, fp_load));
  92         FAIL_IF(show_vmx(child, vmx));
  93         FAIL_IF(validate_vmx(vmx, fp_load));
  94         FAIL_IF(show_vsx_ckpt(child, vsx));
  95         FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
  96         FAIL_IF(show_vmx_ckpt(child, vmx));
  97         FAIL_IF(validate_vmx(vmx, fp_load_ckpt));
  98         memset(vsx, 0, sizeof(vsx));
  99         memset(vmx, 0, sizeof(vmx));
 100
 101         load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);
 102
 103         FAIL_IF(write_vsx_ckpt(child, vsx));
 104         FAIL_IF(write_vmx_ckpt(child, vmx));
 105         pptr[0] = 1;
 106         FAIL_IF(stop_trace(child));
 107         return TEST_PASS;
 108 }
 109
 110 int ptrace_tm_vsx(void)
 111 {
 112         pid_t pid;
 113         int ret, status, i;
 114
 115         SKIP_IF(!have_htm());
 116         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 117
 118         for (i = 0; i < 128; i++) {
 119                 fp_load[i] = 1 + rand();
 120                 fp_load_ckpt[i] = 1 + 2 * rand();
 121                 fp_load_ckpt_new[i] = 1 + 3 * rand();
 122         }
 123
 124         pid = fork();
 125         if (pid < 0) {
 126                 perror("fork() failed");
 127                 return TEST_FAIL;
 128         }
 129
 130         if (pid == 0)
 131                 tm_vsx();
 132
 133         if (pid) {
 134                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 135                 while (!pptr[1])
 136                         asm volatile("" : : : "memory");
 137
 138                 ret = trace_tm_vsx(pid);
 139                 if (ret) {
 140                         kill(pid, SIGKILL);
 141                         shmdt((void *)pptr);
 142                         shmctl(shm_id, IPC_RMID, NULL);
 143                         return TEST_FAIL;
 144                 }
 145
 146                 shmdt((void *)pptr);
 147                 ret = wait(&status);
 148                 shmctl(shm_id, IPC_RMID, NULL);
 149                 if (ret != pid) {
 150                         printf("Child's exit status not captured\n");
 151                         return TEST_FAIL;
 152                 }
 153
 154                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 155                         TEST_PASS;
 156         }
 157         return TEST_PASS;
 158 }
 159
 160 int main(int argc, char *argv[])
 161 {
 162         return test_harness(ptrace_tm_vsx, "ptrace_tm_vsx");
 163 }