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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ptrace test for GPR/FPR registers in TM context
   4  *
   5  * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
   6  */
   7 #include "ptrace.h"
   8 #include "ptrace-gpr.h"
   9 #include "tm.h"
  10
  11 /* Tracer and Tracee Shared Data */
  12 int shm_id;
  13 unsigned long *cptr, *pptr;
  14
  15 float a = FPR_1;
  16 float b = FPR_2;
  17 float c = FPR_3;
  18
  19 void tm_gpr(void)
  20 {
  21         unsigned long gpr_buf[18];
  22         unsigned long result, texasr;
  23         float fpr_buf[32];
  24
  25         printf("Starting the child\n");
  26         cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  27
  28 trans:
  29         cptr[1] = 0;
  30         asm __volatile__(
  31                 ASM_LOAD_GPR_IMMED(gpr_1)
  32                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
  33                 "1: ;"
  34                 "tbegin.;"
  35                 "beq 2f;"
  36                 ASM_LOAD_GPR_IMMED(gpr_2)
  37                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_2)
  38                 "tsuspend.;"
  39                 "li 7, 1;"
  40                 "stw 7, 0(%[cptr1]);"
  41                 "tresume.;"
  42                 "b .;"
  43
  44                 "tend.;"
  45                 "li 0, 0;"
  46                 "ori %[res], 0, 0;"
  47                 "b 3f;"
  48
  49                 /* Transaction abort handler */
  50                 "2: ;"
  51                 "li 0, 1;"
  52                 "ori %[res], 0, 0;"
  53                 "mfspr %[texasr], %[sprn_texasr];"
  54
  55                 "3: ;"
  56                 : [res] "=r" (result), [texasr] "=r" (texasr)
  57                 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2),
  58                 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
  59                 [flt_2] "b" (&b), [cptr1] "b" (&cptr[1])
  60                 : "memory", "r7", "r8", "r9", "r10",
  61                 "r11", "r12", "r13", "r14", "r15", "r16",
  62                 "r17", "r18", "r19", "r20", "r21", "r22",
  63                 "r23", "r24", "r25", "r26", "r27", "r28",
  64                 "r29", "r30", "r31"
  65                 );
  66
  67         if (result) {
  68                 if (!cptr[0])
  69                         goto trans;
  70
  71                 shmdt((void *)cptr);
  72                 store_gpr(gpr_buf);
  73                 store_fpr_single_precision(fpr_buf);
  74
  75                 if (validate_gpr(gpr_buf, GPR_3))
  76                         exit(1);
  77
  78                 if (validate_fpr_float(fpr_buf, c))
  79                         exit(1);
  80
  81                 exit(0);
  82         }
  83         shmdt((void *)cptr);
  84         exit(1);
  85 }
  86
  87 int trace_tm_gpr(pid_t child)
  88 {
  89         unsigned long gpr[18];
  90         unsigned long fpr[32];
  91
  92         FAIL_IF(start_trace(child));
  93         FAIL_IF(show_gpr(child, gpr));
  94         FAIL_IF(validate_gpr(gpr, GPR_2));
  95         FAIL_IF(show_fpr(child, fpr));
  96         FAIL_IF(validate_fpr(fpr, FPR_2_REP));
  97         FAIL_IF(show_ckpt_fpr(child, fpr));
  98         FAIL_IF(validate_fpr(fpr, FPR_1_REP));
  99         FAIL_IF(show_ckpt_gpr(child, gpr));
 100         FAIL_IF(validate_gpr(gpr, GPR_1));
 101         FAIL_IF(write_ckpt_gpr(child, GPR_3));
 102         FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
 103
 104         pptr[0] = 1;
 105         FAIL_IF(stop_trace(child));
 106
 107         return TEST_PASS;
 108 }
 109
 110 int ptrace_tm_gpr(void)
 111 {
 112         pid_t pid;
 113         int ret, status;
 114
 115         SKIP_IF(!have_htm());
 116         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
 117         pid = fork();
 118         if (pid < 0) {
 119                 perror("fork() failed");
 120                 return TEST_FAIL;
 121         }
 122         if (pid == 0)
 123                 tm_gpr();
 124
 125         if (pid) {
 126                 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 127
 128                 while (!pptr[1])
 129                         asm volatile("" : : : "memory");
 130                 ret = trace_tm_gpr(pid);
 131                 if (ret) {
 132                         kill(pid, SIGTERM);
 133                         return TEST_FAIL;
 134                 }
 135
 136                 shmdt((void *)pptr);
 137
 138                 ret = wait(&status);
 139                 shmctl(shm_id, IPC_RMID, NULL);
 140                 if (ret != pid) {
 141                         printf("Child's exit status not captured\n");
 142                         return TEST_FAIL;
 143                 }
 144
 145                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 146                         TEST_PASS;
 147         }
 148         return TEST_PASS;
 149 }
 150
 151 int main(int argc, char *argv[])
 152 {
 153         return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
 154 }