tools/testing/selftests/powerpc/ptrace/ptrace-tar.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ptrace test for TAR, PPR, DSCR registers
   4  *
   5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
   6  */
   7 #include "ptrace.h"
   8 #include "ptrace-tar.h"
   9
  10 /* Tracer and Tracee Shared Data */
  11 int shm_id;
  12 int *cptr;
  13 int *pptr;
  14
  15 void tar(void)
  16 {
  17         unsigned long reg[3];
  18         int ret;
  19
  20         cptr = (int *)shmat(shm_id, NULL, 0);
  21         printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
  22                         user_write, TAR_1, PPR_1, DSCR_1);
  23
  24         mtspr(SPRN_TAR, TAR_1);
  25         mtspr(SPRN_PPR, PPR_1);
  26         mtspr(SPRN_DSCR, DSCR_1);
  27
  28         cptr[2] = 1;
  29
  30         /* Wait on parent */
  31         while (!cptr[0])
  32                 asm volatile("" : : : "memory");
  33
  34         reg[0] = mfspr(SPRN_TAR);
  35         reg[1] = mfspr(SPRN_PPR);
  36         reg[2] = mfspr(SPRN_DSCR);
  37
  38         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  39                         user_read, reg[0], reg[1], reg[2]);
  40
  41         /* Unblock the parent now */
  42         cptr[1] = 1;
  43         shmdt((int *)cptr);
  44
  45         ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
  46         if (ret)
  47                 exit(1);
  48         exit(0);
  49 }
  50
  51 int trace_tar(pid_t child)
  52 {
  53         unsigned long reg[3];
  54
  55         FAIL_IF(start_trace(child));
  56         FAIL_IF(show_tar_registers(child, reg));
  57         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  58                         ptrace_read_running, reg[0], reg[1], reg[2]);
  59
  60         FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
  61         FAIL_IF(stop_trace(child));
  62         return TEST_PASS;
  63 }
  64
  65 int trace_tar_write(pid_t child)
  66 {
  67         FAIL_IF(start_trace(child));
  68         FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
  69         printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
  70                         ptrace_write_running, TAR_2, PPR_2, DSCR_2);
  71
  72         FAIL_IF(stop_trace(child));
  73         return TEST_PASS;
  74 }
  75
  76 int ptrace_tar(void)
  77 {
  78         pid_t pid;
  79         int ret, status;
  80
  81         // TAR was added in v2.07
  82         SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
  83
  84         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
  85         pid = fork();
  86         if (pid < 0) {
  87                 perror("fork() failed");
  88                 return TEST_FAIL;
  89         }
  90
  91         if (pid == 0)
  92                 tar();
  93
  94         if (pid) {
  95                 pptr = (int *)shmat(shm_id, NULL, 0);
  96                 pptr[0] = 0;
  97                 pptr[1] = 0;
  98
  99                 while (!pptr[2])
 100                         asm volatile("" : : : "memory");
 101                 ret = trace_tar(pid);
 102                 if (ret)
 103                         return ret;
 104
 105                 ret = trace_tar_write(pid);
 106                 if (ret)
 107                         return ret;
 108
 109                 /* Unblock the child now */
 110                 pptr[0] = 1;
 111
 112                 /* Wait on child */
 113                 while (!pptr[1])
 114                         asm volatile("" : : : "memory");
 115
 116                 shmdt((int *)pptr);
 117
 118                 ret = wait(&status);
 119                 shmctl(shm_id, IPC_RMID, NULL);
 120                 if (ret != pid) {
 121                         printf("Child's exit status not captured\n");
 122                         return TEST_PASS;
 123                 }
 124
 125                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 126                         TEST_PASS;
 127         }
 128         return TEST_PASS;
 129 }
 130
 131 int main(int argc, char *argv[])
 132 {
 133         return test_harness(ptrace_tar, "ptrace_tar");
 134 }