LXR linux/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 */
  16int shm_id;
  17unsigned long *cptr, *pptr;
  18
  19float a = FPR_1;
  20float b = FPR_2;
  21float c = FPR_3;
  22
  23void 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
  32trans:
  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
  91int 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
 114int 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
 155int main(int argc, char *argv[])
 156{
 157        return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
 158}
 159