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

   1 /*
   2  * Ptrace test for GPR/FPR registers in 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 "ptrace-gpr.h"
  13 #include "tm.h"
  14
  15 /* Tracer and Tracee Shared Data */
  16 int shm_id;
  17 unsigned long *cptr, *pptr;
  18
  19 float a = FPR_1;
  20 float b = FPR_2;
  21 float c = FPR_3;
  22
  23 void tm_gpr(void)
  24 {
  25         unsigned long gpr_buf[18];
  26         unsigned long result, texasr;
  27         float fpr_buf[32];
  28
  29         printf("Starting the child\n");
  30         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  31
  32 trans:
  33         cptr[1] = 0;
  34         asm __volatile__(
  35                 ASM_LOAD_GPR_IMMED(gpr_1)
  36                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
  37                 "1: ;"
  38                 "tbegin.;"
  39                 "beq 2f;"
  40                 ASM_LOAD_GPR_IMMED(gpr_2)
  41                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_2)
  42                 "tsuspend.;"
  43                 "li 7, 1;"
  44                 "stw 7, 0(%[cptr1]);"
  45                 "tresume.;"
  46                 "b .;"
  47
  48                 "tend.;"
  49                 "li 0, 0;"
  50                 "ori %[res], 0, 0;"
  51                 "b 3f;"
  52
  53                 /* Transaction abort handler */
  54                 "2: ;"
  55                 "li 0, 1;"
  56                 "ori %[res], 0, 0;"
  57                 "mfspr %[texasr], %[sprn_texasr];"
  58
  59                 "3: ;"
  60                 : [res] "=r" (result), [texasr] "=r" (texasr)
  61                 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
  62                 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "r" (&a),
  63                 [flt_2] "r" (&b), [cptr1] "r" (&cptr[1])
  64                 : "memory", "r7", "r8", "r9", "r10",
  65                 "r11", "r12", "r13", "r14", "r15", "r16",
  66                 "r17", "r18", "r19", "r20", "r21", "r22",
  67                 "r23", "r24", "r25", "r26", "r27", "r28",
  68                 "r29", "r30", "r31"
  69                 );
  70
  71         if (result) {
  72                 if (!cptr[0])
  73                         goto trans;
  74
  75                 shmdt((void *)cptr);
  76                 store_gpr(gpr_buf);
  77                 store_fpr_single_precision(fpr_buf);
  78
  79                 if (validate_gpr(gpr_buf, GPR_3))
  80                         exit(1);
  81
  82                 if (validate_fpr_float(fpr_buf, c))
  83                         exit(1);
  84
  85                 exit(0);
  86         }
  87         shmdt((void *)cptr);
  88         exit(1);
  89 }
  90
  91 int trace_tm_gpr(pid_t child)
  92 {
  93         unsigned long gpr[18];
  94         unsigned long fpr[32];
  95
  96         FAIL_IF(start_trace(child));
  97         FAIL_IF(show_gpr(child, gpr));
  98         FAIL_IF(validate_gpr(gpr, GPR_2));
  99         FAIL_IF(show_fpr(child, fpr));
 100         FAIL_IF(validate_fpr(fpr, FPR_2_REP));
 101         FAIL_IF(show_ckpt_fpr(child, fpr));
 102         FAIL_IF(validate_fpr(fpr, FPR_1_REP));
 103         FAIL_IF(show_ckpt_gpr(child, gpr));
 104         FAIL_IF(validate_gpr(gpr, GPR_1));
 105         FAIL_IF(write_ckpt_gpr(child, GPR_3));
 106         FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
 107
 108         pptr[0] = 1;
 109         FAIL_IF(stop_trace(child));
 110
 111         return TEST_PASS;
 112 }
 113
 114 int ptrace_tm_gpr(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                 perror("fork() failed");
 124                 return TEST_FAIL;
 125         }
 126         if (pid == 0)
 127                 tm_gpr();
 128
 129         if (pid) {
 130                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 131
 132                 while (!pptr[1])
 133                         asm volatile("" : : : "memory");
 134                 ret = trace_tm_gpr(pid);
 135                 if (ret) {
 136                         kill(pid, SIGTERM);
 137                         return TEST_FAIL;
 138                 }
 139
 140                 shmdt((void *)pptr);
 141
 142                 ret = wait(&status);
 143                 shmctl(shm_id, IPC_RMID, NULL);
 144                 if (ret != pid) {
 145                         printf("Child's exit status not captured\n");
 146                         return TEST_FAIL;
 147                 }
 148
 149                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 150                         TEST_PASS;
 151         }
 152         return TEST_PASS;
 153 }
 154
 155 int main(int argc, char *argv[])
 156 {
 157         return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
 158 }