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

   1 /*
   2  * Ptrace test for GPR/FPR registers in 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 "ptrace-gpr.h"
  13 #include "tm.h"
  14
  15 /* Tracer and Tracee Shared Data */
  16 int shm_id;
  17 int *cptr, *pptr;
  18
  19 float a = FPR_1;
  20 float b = FPR_2;
  21 float c = FPR_3;
  22 float d = FPR_4;
  23
  24 __attribute__((used)) void wait_parent(void)
  25 {
  26         cptr[2] = 1;
  27         while (!cptr[1])
  28                 asm volatile("" : : : "memory");
  29 }
  30
  31 void tm_spd_gpr(void)
  32 {
  33         unsigned long gpr_buf[18];
  34         unsigned long result, texasr;
  35         float fpr_buf[32];
  36
  37         cptr = (int *)shmat(shm_id, NULL, 0);
  38
  39 trans:
  40         cptr[2] = 0;
  41         asm __volatile__(
  42                 ASM_LOAD_GPR_IMMED(gpr_1)
  43                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
  44
  45                 "1: ;"
  46                 "tbegin.;"
  47                 "beq 2f;"
  48
  49                 ASM_LOAD_GPR_IMMED(gpr_2)
  50                 "tsuspend.;"
  51                 ASM_LOAD_GPR_IMMED(gpr_4)
  52                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_4)
  53
  54                 "bl wait_parent;"
  55                 "tresume.;"
  56                 "tend.;"
  57                 "li 0, 0;"
  58                 "ori %[res], 0, 0;"
  59                 "b 3f;"
  60
  61                 /* Transaction abort handler */
  62                 "2: ;"
  63                 "li 0, 1;"
  64                 "ori %[res], 0, 0;"
  65                 "mfspr %[texasr], %[sprn_texasr];"
  66
  67                 "3: ;"
  68                 : [res] "=r" (result), [texasr] "=r" (texasr)
  69                 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
  70                 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
  71                 [flt_4] "b" (&d)
  72                 : "memory", "r5", "r6", "r7",
  73                 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  74                 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  75                 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
  76                 );
  77
  78         if (result) {
  79                 if (!cptr[0])
  80                         goto trans;
  81
  82                 shmdt((void *)cptr);
  83                 store_gpr(gpr_buf);
  84                 store_fpr_single_precision(fpr_buf);
  85
  86                 if (validate_gpr(gpr_buf, GPR_3))
  87                         exit(1);
  88
  89                 if (validate_fpr_float(fpr_buf, c))
  90                         exit(1);
  91                 exit(0);
  92         }
  93         shmdt((void *)cptr);
  94         exit(1);
  95 }
  96
  97 int trace_tm_spd_gpr(pid_t child)
  98 {
  99         unsigned long gpr[18];
 100         unsigned long fpr[32];
 101
 102         FAIL_IF(start_trace(child));
 103         FAIL_IF(show_gpr(child, gpr));
 104         FAIL_IF(validate_gpr(gpr, GPR_4));
 105         FAIL_IF(show_fpr(child, fpr));
 106         FAIL_IF(validate_fpr(fpr, FPR_4_REP));
 107         FAIL_IF(show_ckpt_fpr(child, fpr));
 108         FAIL_IF(validate_fpr(fpr, FPR_1_REP));
 109         FAIL_IF(show_ckpt_gpr(child, gpr));
 110         FAIL_IF(validate_gpr(gpr, GPR_1));
 111         FAIL_IF(write_ckpt_gpr(child, GPR_3));
 112         FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
 113
 114         pptr[0] = 1;
 115         pptr[1] = 1;
 116         FAIL_IF(stop_trace(child));
 117         return TEST_PASS;
 118 }
 119
 120 int ptrace_tm_spd_gpr(void)
 121 {
 122         pid_t pid;
 123         int ret, status;
 124
 125         SKIP_IF(!have_htm());
 126         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 127         pid = fork();
 128         if (pid < 0) {
 129                 perror("fork() failed");
 130                 return TEST_FAIL;
 131         }
 132
 133         if (pid == 0)
 134                 tm_spd_gpr();
 135
 136         if (pid) {
 137                 pptr = (int *)shmat(shm_id, NULL, 0);
 138                 pptr[0] = 0;
 139                 pptr[1] = 0;
 140
 141                 while (!pptr[2])
 142                         asm volatile("" : : : "memory");
 143                 ret = trace_tm_spd_gpr(pid);
 144                 if (ret) {
 145                         kill(pid, SIGTERM);
 146                         shmdt((void *)pptr);
 147                         shmctl(shm_id, IPC_RMID, NULL);
 148                         return TEST_FAIL;
 149                 }
 150
 151                 shmdt((void *)pptr);
 152
 153                 ret = wait(&status);
 154                 shmctl(shm_id, IPC_RMID, NULL);
 155                 if (ret != pid) {
 156                         printf("Child's exit status not captured\n");
 157                         return TEST_FAIL;
 158                 }
 159
 160                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 161                         TEST_PASS;
 162         }
 163         return TEST_PASS;
 164 }
 165
 166 int main(int argc, char *argv[])
 167 {
 168         return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
 169 }