1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Ptrace test for TAR, PPR, DSCR registers 4 * 5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation. 6 */ 7 #include "ptrace.h" 8 #include "ptrace-tar.h" 9 10 /* Tracer and Tracee Shared Data */ 11 int shm_id; 12 int *cptr; 13 int *pptr; 14 15 void tar(void) 16 { 17 unsigned long reg[3]; 18 int ret; 19 20 cptr = (int *)shmat(shm_id, NULL, 0); 21 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n", 22 user_write, TAR_1, PPR_1, DSCR_1); 23 24 mtspr(SPRN_TAR, TAR_1); 25 mtspr(SPRN_PPR, PPR_1); 26 mtspr(SPRN_DSCR, DSCR_1); 27 28 cptr[2] = 1; 29 30 /* Wait on parent */ 31 while (!cptr[0]) 32 asm volatile("" : : : "memory"); 33 34 reg[0] = mfspr(SPRN_TAR); 35 reg[1] = mfspr(SPRN_PPR); 36 reg[2] = mfspr(SPRN_DSCR); 37 38 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", 39 user_read, reg[0], reg[1], reg[2]); 40 41 /* Unblock the parent now */ 42 cptr[1] = 1; 43 shmdt((int *)cptr); 44 45 ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2); 46 if (ret) 47 exit(1); 48 exit(0); 49 } 50 51 int trace_tar(pid_t child) 52 { 53 unsigned long reg[3]; 54 55 FAIL_IF(start_trace(child)); 56 FAIL_IF(show_tar_registers(child, reg)); 57 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", 58 ptrace_read_running, reg[0], reg[1], reg[2]); 59 60 FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1)); 61 FAIL_IF(stop_trace(child)); 62 return TEST_PASS; 63 } 64 65 int trace_tar_write(pid_t child) 66 { 67 FAIL_IF(start_trace(child)); 68 FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2)); 69 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n", 70 ptrace_write_running, TAR_2, PPR_2, DSCR_2); 71 72 FAIL_IF(stop_trace(child)); 73 return TEST_PASS; 74 } 75 76 int ptrace_tar(void) 77 { 78 pid_t pid; 79 int ret, status; 80 81 // TAR was added in v2.07 82 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07)); 83 84 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT); 85 pid = fork(); 86 if (pid < 0) { 87 perror("fork() failed"); 88 return TEST_FAIL; 89 } 90 91 if (pid == 0) 92 tar(); 93 94 if (pid) { 95 pptr = (int *)shmat(shm_id, NULL, 0); 96 pptr[0] = 0; 97 pptr[1] = 0; 98 99 while (!pptr[2]) 100 asm volatile("" : : : "memory"); 101 ret = trace_tar(pid); 102 if (ret) 103 return ret; 104 105 ret = trace_tar_write(pid); 106 if (ret) 107 return ret; 108 109 /* Unblock the child now */ 110 pptr[0] = 1; 111 112 /* Wait on child */ 113 while (!pptr[1]) 114 asm volatile("" : : : "memory"); 115 116 shmdt((int *)pptr); 117 118 ret = wait(&status); 119 shmctl(shm_id, IPC_RMID, NULL); 120 if (ret != pid) { 121 printf("Child's exit status not captured\n"); 122 return TEST_PASS; 123 } 124 125 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL : 126 TEST_PASS; 127 } 128 return TEST_PASS; 129 } 130 131 int main(int argc, char *argv[]) 132 { 133 return test_harness(ptrace_tar, "ptrace_tar"); 134 } 135