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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Ptrace test for TAR, PPR, DSCR registers in the TM context
   4 *
   5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
   6 */
   7#include "ptrace.h"
   8#include "tm.h"
   9#include "ptrace-tar.h"
  10
  11int shm_id;
  12unsigned long *cptr, *pptr;
  13
  14
  15void tm_tar(void)
  16{
  17        unsigned long result, texasr;
  18        unsigned long regs[3];
  19        int ret;
  20
  21        cptr = (unsigned long *)shmat(shm_id, NULL, 0);
  22
  23trans:
  24        cptr[1] = 0;
  25        asm __volatile__(
  26                "li     4, %[tar_1];"
  27                "mtspr %[sprn_tar],  4;"        /* TAR_1 */
  28                "li     4, %[dscr_1];"
  29                "mtspr %[sprn_dscr], 4;"        /* DSCR_1 */
  30                "or     31,31,31;"              /* PPR_1*/
  31
  32                "1: ;"
  33                "tbegin.;"
  34                "beq 2f;"
  35
  36                "li     4, %[tar_2];"
  37                "mtspr %[sprn_tar],  4;"        /* TAR_2 */
  38                "li     4, %[dscr_2];"
  39                "mtspr %[sprn_dscr], 4;"        /* DSCR_2 */
  40                "or     1,1,1;"                 /* PPR_2 */
  41                "tsuspend.;"
  42                "li 0, 1;"
  43                "stw 0, 0(%[cptr1]);"
  44                "tresume.;"
  45                "b .;"
  46
  47                "tend.;"
  48                "li 0, 0;"
  49                "ori %[res], 0, 0;"
  50                "b 3f;"
  51
  52                /* Transaction abort handler */
  53                "2: ;"
  54                "li 0, 1;"
  55                "ori %[res], 0, 0;"
  56                "mfspr %[texasr], %[sprn_texasr];"
  57
  58                "3: ;"
  59
  60                : [res] "=r" (result), [texasr] "=r" (texasr)
  61                : [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR),
  62                [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
  63                [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2),
  64                [dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1])
  65                : "memory", "r0", "r3", "r4", "r5", "r6"
  66                );
  67
  68        /* TM failed, analyse */
  69        if (result) {
  70                if (!cptr[0])
  71                        goto trans;
  72
  73                regs[0] = mfspr(SPRN_TAR);
  74                regs[1] = mfspr(SPRN_PPR);
  75                regs[2] = mfspr(SPRN_DSCR);
  76
  77                shmdt(&cptr);
  78                printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  79                                user_read, regs[0], regs[1], regs[2]);
  80
  81                ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
  82                if (ret)
  83                        exit(1);
  84                exit(0);
  85        }
  86        shmdt(&cptr);
  87        exit(1);
  88}
  89
  90int trace_tm_tar(pid_t child)
  91{
  92        unsigned long regs[3];
  93
  94        FAIL_IF(start_trace(child));
  95        FAIL_IF(show_tar_registers(child, regs));
  96        printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
  97                        ptrace_read_running, regs[0], regs[1], regs[2]);
  98
  99        FAIL_IF(validate_tar_registers(regs, TAR_2, PPR_2, DSCR_2));
 100        FAIL_IF(show_tm_checkpointed_state(child, regs));
 101        printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 102                        ptrace_read_ckpt, regs[0], regs[1], regs[2]);
 103
 104        FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
 105        FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
 106        printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 107                        ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
 108
 109        pptr[0] = 1;
 110        FAIL_IF(stop_trace(child));
 111        return TEST_PASS;
 112}
 113
 114int ptrace_tm_tar(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                tm_tar();
 124
 125        pptr = (unsigned long *)shmat(shm_id, NULL, 0);
 126        pptr[0] = 0;
 127
 128        if (pid) {
 129                while (!pptr[1])
 130                        asm volatile("" : : : "memory");
 131                ret = trace_tm_tar(pid);
 132                if (ret) {
 133                        kill(pid, SIGTERM);
 134                        shmdt(&pptr);
 135                        shmctl(shm_id, IPC_RMID, NULL);
 136                        return TEST_FAIL;
 137                }
 138                shmdt(&pptr);
 139
 140                ret = wait(&status);
 141                shmctl(shm_id, IPC_RMID, NULL);
 142                if (ret != pid) {
 143                        printf("Child's exit status not captured\n");
 144                        return TEST_FAIL;
 145                }
 146
 147                return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
 148                        TEST_PASS;
 149        }
 150        return TEST_PASS;
 151}
 152
 153int main(int argc, char *argv[])
 154{
 155        return test_harness(ptrace_tm_tar, "ptrace_tm_tar");
 156}
 157