LXR linux/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 */
  12int shm_id;
  13unsigned long *cptr, *pptr;
  14
  15float a = FPR_1;
  16float b = FPR_2;
  17float c = FPR_3;
  18
  19void 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
  28trans:
  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
  87int 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
 110int 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
 151int main(int argc, char *argv[])
 152{
 153        return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr");
 154}
 155