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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Ptrace test for GPR/FPR registers in TM Suspend 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 */
  12int shm_id;
  13int *cptr, *pptr;
  14
  15float a = FPR_1;
  16float b = FPR_2;
  17float c = FPR_3;
  18float d = FPR_4;
  19
  20__attribute__((used)) void wait_parent(void)
  21{
  22        cptr[2] = 1;
  23        while (!cptr[1])
  24                asm volatile("" : : : "memory");
  25}
  26
  27void tm_spd_gpr(void)
  28{
  29        unsigned long gpr_buf[18];
  30        unsigned long result, texasr;
  31        float fpr_buf[32];
  32
  33        cptr = (int *)shmat(shm_id, NULL, 0);
  34
  35trans:
  36        cptr[2] = 0;
  37        asm __volatile__(
  38                ASM_LOAD_GPR_IMMED(gpr_1)
  39                ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
  40
  41                "1: ;"
  42                "tbegin.;"
  43                "beq 2f;"
  44
  45                ASM_LOAD_GPR_IMMED(gpr_2)
  46                "tsuspend.;"
  47                ASM_LOAD_GPR_IMMED(gpr_4)
  48                ASM_LOAD_FPR_SINGLE_PRECISION(flt_4)
  49
  50                "bl wait_parent;"
  51                "tresume.;"
  52                "tend.;"
  53                "li 0, 0;"
  54                "ori %[res], 0, 0;"
  55                "b 3f;"
  56
  57                /* Transaction abort handler */
  58                "2: ;"
  59                "li 0, 1;"
  60                "ori %[res], 0, 0;"
  61                "mfspr %[texasr], %[sprn_texasr];"
  62
  63                "3: ;"
  64                : [res] "=r" (result), [texasr] "=r" (texasr)
  65                : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
  66                [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
  67                [flt_4] "b" (&d)
  68                : "memory", "r5", "r6", "r7",
  69                "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  70                "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  71                "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
  72                );
  73
  74        if (result) {
  75                if (!cptr[0])
  76                        goto trans;
  77
  78                shmdt((void *)cptr);
  79                store_gpr(gpr_buf);
  80                store_fpr_single_precision(fpr_buf);
  81
  82                if (validate_gpr(gpr_buf, GPR_3))
  83                        exit(1);
  84
  85                if (validate_fpr_float(fpr_buf, c))
  86                        exit(1);
  87                exit(0);
  88        }
  89        shmdt((void *)cptr);
  90        exit(1);
  91}
  92
  93int trace_tm_spd_gpr(pid_t child)
  94{
  95        unsigned long gpr[18];
  96        unsigned long fpr[32];
  97
  98        FAIL_IF(start_trace(child));
  99        FAIL_IF(show_gpr(child, gpr));
 100        FAIL_IF(validate_gpr(gpr, GPR_4));
 101        FAIL_IF(show_fpr(child, fpr));
 102        FAIL_IF(validate_fpr(fpr, FPR_4_REP));
 103        FAIL_IF(show_ckpt_fpr(child, fpr));
 104        FAIL_IF(validate_fpr(fpr, FPR_1_REP));
 105        FAIL_IF(show_ckpt_gpr(child, gpr));
 106        FAIL_IF(validate_gpr(gpr, GPR_1));
 107        FAIL_IF(write_ckpt_gpr(child, GPR_3));
 108        FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
 109
 110        pptr[0] = 1;
 111        pptr[1] = 1;
 112        FAIL_IF(stop_trace(child));
 113        return TEST_PASS;
 114}
 115
 116int ptrace_tm_spd_gpr(void)
 117{
 118        pid_t pid;
 119        int ret, status;
 120
 121        SKIP_IF(!have_htm());
 122        shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 123        pid = fork();
 124        if (pid < 0) {
 125                perror("fork() failed");
 126                return TEST_FAIL;
 127        }
 128
 129        if (pid == 0)
 130                tm_spd_gpr();
 131
 132        if (pid) {
 133                pptr = (int *)shmat(shm_id, NULL, 0);
 134                pptr[0] = 0;
 135                pptr[1] = 0;
 136
 137                while (!pptr[2])
 138                        asm volatile("" : : : "memory");
 139                ret = trace_tm_spd_gpr(pid);
 140                if (ret) {
 141                        kill(pid, SIGTERM);
 142                        shmdt((void *)pptr);
 143                        shmctl(shm_id, IPC_RMID, NULL);
 144                        return TEST_FAIL;
 145                }
 146
 147                shmdt((void *)pptr);
 148
 149                ret = wait(&status);
 150                shmctl(shm_id, IPC_RMID, NULL);
 151                if (ret != pid) {
 152                        printf("Child's exit status not captured\n");
 153                        return TEST_FAIL;
 154                }
 155
 156                return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 157                        TEST_PASS;
 158        }
 159        return TEST_PASS;
 160}
 161
 162int main(int argc, char *argv[])
 163{
 164        return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
 165}
 166