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

   1 /*
   2  * Ptrace test for TAR, PPR, DSCR 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-tar.h"
  14
  15 int shm_id;
  16 unsigned long *cptr, *pptr;
  17
  18
  19 void tm_tar(void)
  20 {
  21         unsigned long result, texasr;
  22         unsigned long regs[3];
  23         int ret;
  24
  25         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  26
  27 trans:
  28         cptr[1] = 0;
  29         asm __volatile__(
  30                 "li     4, %[tar_1];"
  31                 "mtspr %[sprn_tar],  4;"        /* TAR_1 */
  32                 "li     4, %[dscr_1];"
  33                 "mtspr %[sprn_dscr], 4;"        /* DSCR_1 */
  34                 "or     31,31,31;"              /* PPR_1*/
  35
  36                 "1: ;"
  37                 "tbegin.;"
  38                 "beq 2f;"
  39
  40                 "li     4, %[tar_2];"
  41                 "mtspr %[sprn_tar],  4;"        /* TAR_2 */
  42                 "li     4, %[dscr_2];"
  43                 "mtspr %[sprn_dscr], 4;"        /* DSCR_2 */
  44                 "or     1,1,1;"                 /* PPR_2 */
  45                 "tsuspend.;"
  46                 "li 0, 1;"
  47                 "stw 0, 0(%[cptr1]);"
  48                 "tresume.;"
  49                 "b .;"
  50
  51                 "tend.;"
  52                 "li 0, 0;"
  53                 "ori %[res], 0, 0;"
  54                 "b 3f;"
  55
  56                 /* Transaction abort handler */
  57                 "2: ;"
  58                 "li 0, 1;"
  59                 "ori %[res], 0, 0;"
  60                 "mfspr %[texasr], %[sprn_texasr];"
  61
  62                 "3: ;"
  63
  64                 : [res] "=r" (result), [texasr] "=r" (texasr)
  65                 : [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR),
  66                 [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
  67                 [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2),
  68                 [dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1])
  69                 : "memory", "r0", "r1", "r3", "r4", "r5", "r6"
  70                 );
  71
  72         /* TM failed, analyse */
  73         if (result) {
  74                 if (!cptr[0])
  75                         goto trans;
  76
  77                 regs[0] = mfspr(SPRN_TAR);
  78                 regs[1] = mfspr(SPRN_PPR);
  79                 regs[2] = mfspr(SPRN_DSCR);
  80
  81                 shmdt(&cptr);
  82                 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  83                                 user_read, regs[0], regs[1], regs[2]);
  84
  85                 ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
  86                 if (ret)
  87                         exit(1);
  88                 exit(0);
  89         }
  90         shmdt(&cptr);
  91         exit(1);
  92 }
  93
  94 int trace_tm_tar(pid_t child)
  95 {
  96         unsigned long regs[3];
  97
  98         FAIL_IF(start_trace(child));
  99         FAIL_IF(show_tar_registers(child, regs));
 100         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 101                         ptrace_read_running, regs[0], regs[1], regs[2]);
 102
 103         FAIL_IF(validate_tar_registers(regs, TAR_2, PPR_2, DSCR_2));
 104         FAIL_IF(show_tm_checkpointed_state(child, regs));
 105         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 106                         ptrace_read_ckpt, regs[0], regs[1], regs[2]);
 107
 108         FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
 109         FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
 110         printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 111                         ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
 112
 113         pptr[0] = 1;
 114         FAIL_IF(stop_trace(child));
 115         return TEST_PASS;
 116 }
 117
 118 int ptrace_tm_tar(void)
 119 {
 120         pid_t pid;
 121         int ret, status;
 122
 123         SKIP_IF(!have_htm());
 124         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 125         pid = fork();
 126         if (pid == 0)
 127                 tm_tar();
 128
 129         pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 130         pptr[0] = 0;
 131
 132         if (pid) {
 133                 while (!pptr[1])
 134                         asm volatile("" : : : "memory");
 135                 ret = trace_tm_tar(pid);
 136                 if (ret) {
 137                         kill(pid, SIGTERM);
 138                         shmdt(&pptr);
 139                         shmctl(shm_id, IPC_RMID, NULL);
 140                         return TEST_FAIL;
 141                 }
 142                 shmdt(&pptr);
 143
 144                 ret = wait(&status);
 145                 shmctl(shm_id, IPC_RMID, NULL);
 146                 if (ret != pid) {
 147                         printf("Child's exit status not captured\n");
 148                         return TEST_FAIL;
 149                 }
 150
 151                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 152                         TEST_PASS;
 153         }
 154         return TEST_PASS;
 155 }
 156
 157 int main(int argc, char *argv[])
 158 {
 159         return test_harness(ptrace_tm_tar, "ptrace_tm_tar");
 160 }