LXR linux/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 */
  16int shm_id;
  17int *cptr, *pptr;
  18
  19float a = FPR_1;
  20float b = FPR_2;
  21float c = FPR_3;
  22float 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
  31void 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
  39trans:
  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] "r" (&a),
  71                [flt_2] "r" (&b), [flt_4] "r" (&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
  97int 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
 120int 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
 166int main(int argc, char *argv[])
 167{
 168        return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
 169}
 170