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

   1 /*
   2  * Ptrace test for TAR, PPR, DSCR 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-tar.h"
  14
  15 int shm_id;
  16 int *cptr, *pptr;
  17
  18 __attribute__((used)) void wait_parent(void)
  19 {
  20         cptr[2] = 1;
  21         while (!cptr[1])
  22                 asm volatile("" : : : "memory");
  23 }
  24
  25 void tm_spd_tar(void)
  26 {
  27         unsigned long result, texasr;
  28         unsigned long regs[3];
  29         int ret;
  30
  31         cptr = (int *)shmat(shm_id, NULL, 0);
  32
  33 trans:
  34         cptr[2] = 0;
  35         asm __volatile__(
  36                 "li     4, %[tar_1];"
  37                 "mtspr %[sprn_tar],  4;"        /* TAR_1 */
  38                 "li     4, %[dscr_1];"
  39                 "mtspr %[sprn_dscr], 4;"        /* DSCR_1 */
  40                 "or     31,31,31;"              /* PPR_1*/
  41
  42                 "1: ;"
  43                 "tbegin.;"
  44                 "beq 2f;"
  45
  46                 "li     4, %[tar_2];"
  47                 "mtspr %[sprn_tar],  4;"        /* TAR_2 */
  48                 "li     4, %[dscr_2];"
  49                 "mtspr %[sprn_dscr], 4;"        /* DSCR_2 */
  50                 "or     1,1,1;"                 /* PPR_2 */
  51
  52                 "tsuspend.;"
  53                 "li     4, %[tar_3];"
  54                 "mtspr %[sprn_tar],  4;"        /* TAR_3 */
  55                 "li     4, %[dscr_3];"
  56                 "mtspr %[sprn_dscr], 4;"        /* DSCR_3 */
  57                 "or     6,6,6;"                 /* PPR_3 */
  58                 "bl wait_parent;"
  59                 "tresume.;"
  60
  61                 "tend.;"
  62                 "li 0, 0;"
  63                 "ori %[res], 0, 0;"
  64                 "b 3f;"
  65
  66                 /* Transaction abort handler */
  67                 "2: ;"
  68                 "li 0, 1;"
  69                 "ori %[res], 0, 0;"
  70                 "mfspr %[texasr], %[sprn_texasr];"
  71
  72                 "3: ;"
  73
  74                 : [res] "=r" (result), [texasr] "=r" (texasr)
  75                 : [val] "r" (cptr[1]), [sprn_dscr]"i"(SPRN_DSCR),
  76                 [sprn_tar]"i"(SPRN_TAR), [sprn_ppr]"i"(SPRN_PPR),
  77                 [sprn_texasr]"i"(SPRN_TEXASR), [tar_1]"i"(TAR_1),
  78                 [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2),
  79                 [tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3)
  80                 : "memory", "r0", "r1", "r3", "r4", "r5", "r6"
  81                 );
  82
  83         /* TM failed, analyse */
  84         if (result) {
  85                 if (!cptr[0])
  86                         goto trans;
  87
  88                 regs[0] = mfspr(SPRN_TAR);
  89                 regs[1] = mfspr(SPRN_PPR);
  90                 regs[2] = mfspr(SPRN_DSCR);
  91
  92                 shmdt(&cptr);
  93                 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  94                                 user_read, regs[0], regs[1], regs[2]);
  95
  96                 ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
  97                 if (ret)
  98                         exit(1);
  99                 exit(0);
 100         }
 101         shmdt(&cptr);
 102         exit(1);
 103 }
 104
 105 int trace_tm_spd_tar(pid_t child)
 106 {
 107         unsigned long regs[3];
 108
 109         FAIL_IF(start_trace(child));
 110         FAIL_IF(show_tar_registers(child, regs));
 111         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 112                         ptrace_read_running, regs[0], regs[1], regs[2]);
 113
 114         FAIL_IF(validate_tar_registers(regs, TAR_3, PPR_3, DSCR_3));
 115         FAIL_IF(show_tm_checkpointed_state(child, regs));
 116         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 117                         ptrace_read_ckpt, regs[0], regs[1], regs[2]);
 118
 119         FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
 120         FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
 121         printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 122                         ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
 123
 124         pptr[0] = 1;
 125         pptr[1] = 1;
 126         FAIL_IF(stop_trace(child));
 127         return TEST_PASS;
 128 }
 129
 130 int ptrace_tm_spd_tar(void)
 131 {
 132         pid_t pid;
 133         int ret, status;
 134
 135         SKIP_IF(!have_htm());
 136         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 137         pid = fork();
 138         if (pid == 0)
 139                 tm_spd_tar();
 140
 141         pptr = (int *)shmat(shm_id, NULL, 0);
 142         pptr[0] = 0;
 143         pptr[1] = 0;
 144
 145         if (pid) {
 146                 while (!pptr[2])
 147                         asm volatile("" : : : "memory");
 148                 ret = trace_tm_spd_tar(pid);
 149                 if (ret) {
 150                         kill(pid, SIGTERM);
 151                         shmdt(&pptr);
 152                         shmctl(shm_id, IPC_RMID, NULL);
 153                         return TEST_FAIL;
 154                 }
 155
 156                 shmdt(&pptr);
 157
 158                 ret = wait(&status);
 159                 shmctl(shm_id, IPC_RMID, NULL);
 160                 if (ret != pid) {
 161                         printf("Child's exit status not captured\n");
 162                         return TEST_FAIL;
 163                 }
 164
 165                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 166                         TEST_PASS;
 167         }
 168         return TEST_PASS;
 169 }
 170
 171 int main(int argc, char *argv[])
 172 {
 173         return test_harness(ptrace_tm_spd_tar, "ptrace_tm_spd_tar");
 174 }