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

   1 /*
   2  * Ptrace test for GPR/FPR registers
   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 "reg.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
  23 void gpr(void)
  24 {
  25         unsigned long gpr_buf[18];
  26         float fpr_buf[32];
  27
  28         cptr = (int *)shmat(shm_id, NULL, 0);
  29
  30         asm __volatile__(
  31                 ASM_LOAD_GPR_IMMED(gpr_1)
  32                 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
  33                 :
  34                 : [gpr_1]"i"(GPR_1), [flt_1] "b" (&a)
  35                 : "memory", "r6", "r7", "r8", "r9", "r10",
  36                 "r11", "r12", "r13", "r14", "r15", "r16", "r17",
  37                 "r18", "r19", "r20", "r21", "r22", "r23", "r24",
  38                 "r25", "r26", "r27", "r28", "r29", "r30", "r31"
  39                 );
  40
  41         cptr[1] = 1;
  42
  43         while (!cptr[0])
  44                 asm volatile("" : : : "memory");
  45
  46         shmdt((void *)cptr);
  47         store_gpr(gpr_buf);
  48         store_fpr_single_precision(fpr_buf);
  49
  50         if (validate_gpr(gpr_buf, GPR_3))
  51                 exit(1);
  52
  53         if (validate_fpr_float(fpr_buf, c))
  54                 exit(1);
  55
  56         exit(0);
  57 }
  58
  59 int trace_gpr(pid_t child)
  60 {
  61         unsigned long gpr[18];
  62         unsigned long fpr[32];
  63
  64         FAIL_IF(start_trace(child));
  65         FAIL_IF(show_gpr(child, gpr));
  66         FAIL_IF(validate_gpr(gpr, GPR_1));
  67         FAIL_IF(show_fpr(child, fpr));
  68         FAIL_IF(validate_fpr(fpr, FPR_1_REP));
  69         FAIL_IF(write_gpr(child, GPR_3));
  70         FAIL_IF(write_fpr(child, FPR_3_REP));
  71         FAIL_IF(stop_trace(child));
  72
  73         return TEST_PASS;
  74 }
  75
  76 int ptrace_gpr(void)
  77 {
  78         pid_t pid;
  79         int ret, status;
  80
  81         shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
  82         pid = fork();
  83         if (pid < 0) {
  84                 perror("fork() failed");
  85                 return TEST_FAIL;
  86         }
  87         if (pid == 0)
  88                 gpr();
  89
  90         if (pid) {
  91                 pptr = (int *)shmat(shm_id, NULL, 0);
  92                 while (!pptr[1])
  93                         asm volatile("" : : : "memory");
  94
  95                 ret = trace_gpr(pid);
  96                 if (ret) {
  97                         kill(pid, SIGTERM);
  98                         shmdt((void *)pptr);
  99                         shmctl(shm_id, IPC_RMID, NULL);
 100                         return TEST_FAIL;
 101                 }
 102
 103                 pptr[0] = 1;
 104                 shmdt((void *)pptr);
 105
 106                 ret = wait(&status);
 107                 shmctl(shm_id, IPC_RMID, NULL);
 108                 if (ret != pid) {
 109                         printf("Child's exit status not captured\n");
 110                         return TEST_FAIL;
 111                 }
 112
 113                 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 114                         TEST_PASS;
 115         }
 116
 117         return TEST_PASS;
 118 }
 119
 120 int main(int argc, char *argv[])
 121 {
 122         return test_harness(ptrace_gpr, "ptrace_gpr");
 123 }