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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ptrace test for TAR, PPR, DSCR 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-tar.h"
  10
  11 int shm_id;
  12 unsigned long *cptr, *pptr;
  13
  14
  15 void tm_tar(void)
  16 {
  17         unsigned long result, texasr;
  18         unsigned long regs[3];
  19         int ret;
  20
  21         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  22
  23 trans:
  24         cptr[1] = 0;
  25         asm __volatile__(
  26                 "li     4, %[tar_1];"
  27                 "mtspr %[sprn_tar],  4;"        /* TAR_1 */
  28                 "li     4, %[dscr_1];"
  29                 "mtspr %[sprn_dscr], 4;"        /* DSCR_1 */
  30                 "or     31,31,31;"              /* PPR_1*/
  31
  32                 "1: ;"
  33                 "tbegin.;"
  34                 "beq 2f;"
  35
  36                 "li     4, %[tar_2];"
  37                 "mtspr %[sprn_tar],  4;"        /* TAR_2 */
  38                 "li     4, %[dscr_2];"
  39                 "mtspr %[sprn_dscr], 4;"        /* DSCR_2 */
  40                 "or     1,1,1;"                 /* PPR_2 */
  41                 "tsuspend.;"
  42                 "li 0, 1;"
  43                 "stw 0, 0(%[cptr1]);"
  44                 "tresume.;"
  45                 "b .;"
  46
  47                 "tend.;"
  48                 "li 0, 0;"
  49                 "ori %[res], 0, 0;"
  50                 "b 3f;"
  51
  52                 /* Transaction abort handler */
  53                 "2: ;"
  54                 "li 0, 1;"
  55                 "ori %[res], 0, 0;"
  56                 "mfspr %[texasr], %[sprn_texasr];"
  57
  58                 "3: ;"
  59
  60                 : [res] "=r" (result), [texasr] "=r" (texasr)
  61                 : [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR),
  62                 [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
  63                 [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2),
  64                 [dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1])
  65                 : "memory", "r0", "r1", "r3", "r4", "r5", "r6"
  66                 );
  67
  68         /* TM failed, analyse */
  69         if (result) {
  70                 if (!cptr[0])
  71                         goto trans;
  72
  73                 regs[0] = mfspr(SPRN_TAR);
  74                 regs[1] = mfspr(SPRN_PPR);
  75                 regs[2] = mfspr(SPRN_DSCR);
  76
  77                 shmdt(&cptr);
  78                 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  79                                 user_read, regs[0], regs[1], regs[2]);
  80
  81                 ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
  82                 if (ret)
  83                         exit(1);
  84                 exit(0);
  85         }
  86         shmdt(&cptr);
  87         exit(1);
  88 }
  89
  90 int trace_tm_tar(pid_t child)
  91 {
  92         unsigned long regs[3];
  93
  94         FAIL_IF(start_trace(child));
  95         FAIL_IF(show_tar_registers(child, regs));
  96         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  97                         ptrace_read_running, regs[0], regs[1], regs[2]);
  98
  99         FAIL_IF(validate_tar_registers(regs, TAR_2, PPR_2, DSCR_2));
 100         FAIL_IF(show_tm_checkpointed_state(child, regs));
 101         printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 102                         ptrace_read_ckpt, regs[0], regs[1], regs[2]);
 103
 104         FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
 105         FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
 106         printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 107                         ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
 108
 109         pptr[0] = 1;
 110         FAIL_IF(stop_trace(child));
 111         return TEST_PASS;
 112 }
 113
 114 int ptrace_tm_tar(void)
 115 {
 116         pid_t pid;
 117         int ret, status;
 118
 119         SKIP_IF(!have_htm());
 120         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 121         pid = fork();
 122         if (pid == 0)
 123                 tm_tar();
 124
 125         pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 126         pptr[0] = 0;
 127
 128         if (pid) {
 129                 while (!pptr[1])
 130                         asm volatile("" : : : "memory");
 131                 ret = trace_tm_tar(pid);
 132                 if (ret) {
 133                         kill(pid, SIGTERM);
 134                         shmdt(&pptr);
 135                         shmctl(shm_id, IPC_RMID, NULL);
 136                         return TEST_FAIL;
 137                 }
 138                 shmdt(&pptr);
 139
 140                 ret = wait(&status);
 141                 shmctl(shm_id, IPC_RMID, NULL);
 142                 if (ret != pid) {
 143                         printf("Child's exit status not captured\n");
 144                         return TEST_FAIL;
 145                 }
 146
 147                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 148                         TEST_PASS;
 149         }
 150         return TEST_PASS;
 151 }
 152
 153 int main(int argc, char *argv[])
 154 {
 155         return test_harness(ptrace_tm_tar, "ptrace_tm_tar");
 156 }