1 /* 2 * Ptrace test for TAR, PPR, DSCR registers in the 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 "tm.h" 13 #include "ptrace-tar.h" 14 15 int shm_id; 16 int *cptr, *pptr; 17 18 __attribute__((used)) void wait_parent(void) 19 { 20 cptr[2] = 1; 21 while (!cptr[1]) 22 asm volatile("" : : : "memory"); 23 } 24 25 void tm_spd_tar(void) 26 { 27 unsigned long result, texasr; 28 unsigned long regs[3]; 29 int ret; 30 31 cptr = (int *)shmat(shm_id, NULL, 0); 32 33 trans: 34 cptr[2] = 0; 35 asm __volatile__( 36 "li 4, %[tar_1];" 37 "mtspr %[sprn_tar], 4;" /* TAR_1 */ 38 "li 4, %[dscr_1];" 39 "mtspr %[sprn_dscr], 4;" /* DSCR_1 */ 40 "or 31,31,31;" /* PPR_1*/ 41 42 "1: ;" 43 "tbegin.;" 44 "beq 2f;" 45 46 "li 4, %[tar_2];" 47 "mtspr %[sprn_tar], 4;" /* TAR_2 */ 48 "li 4, %[dscr_2];" 49 "mtspr %[sprn_dscr], 4;" /* DSCR_2 */ 50 "or 1,1,1;" /* PPR_2 */ 51 52 "tsuspend.;" 53 "li 4, %[tar_3];" 54 "mtspr %[sprn_tar], 4;" /* TAR_3 */ 55 "li 4, %[dscr_3];" 56 "mtspr %[sprn_dscr], 4;" /* DSCR_3 */ 57 "or 6,6,6;" /* PPR_3 */ 58 "bl wait_parent;" 59 "tresume.;" 60 61 "tend.;" 62 "li 0, 0;" 63 "ori %[res], 0, 0;" 64 "b 3f;" 65 66 /* Transaction abort handler */ 67 "2: ;" 68 "li 0, 1;" 69 "ori %[res], 0, 0;" 70 "mfspr %[texasr], %[sprn_texasr];" 71 72 "3: ;" 73 74 : [res] "=r" (result), [texasr] "=r" (texasr) 75 : [sprn_dscr]"i"(SPRN_DSCR), 76 [sprn_tar]"i"(SPRN_TAR), [sprn_ppr]"i"(SPRN_PPR), 77 [sprn_texasr]"i"(SPRN_TEXASR), [tar_1]"i"(TAR_1), 78 [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2), 79 [tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3) 80 : "memory", "r0", "r1", "r3", "r4", "r5", "r6" 81 ); 82 83 /* TM failed, analyse */ 84 if (result) { 85 if (!cptr[0]) 86 goto trans; 87 88 regs[0] = mfspr(SPRN_TAR); 89 regs[1] = mfspr(SPRN_PPR); 90 regs[2] = mfspr(SPRN_DSCR); 91 92 shmdt(&cptr); 93 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", 94 user_read, regs[0], regs[1], regs[2]); 95 96 ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4); 97 if (ret) 98 exit(1); 99 exit(0); 100 } 101 shmdt(&cptr); 102 exit(1); 103 } 104 105 int trace_tm_spd_tar(pid_t child) 106 { 107 unsigned long regs[3]; 108 109 FAIL_IF(start_trace(child)); 110 FAIL_IF(show_tar_registers(child, regs)); 111 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", 112 ptrace_read_running, regs[0], regs[1], regs[2]); 113 114 FAIL_IF(validate_tar_registers(regs, TAR_3, PPR_3, DSCR_3)); 115 FAIL_IF(show_tm_checkpointed_state(child, regs)); 116 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n", 117 ptrace_read_ckpt, regs[0], regs[1], regs[2]); 118 119 FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1)); 120 FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4)); 121 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n", 122 ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4); 123 124 pptr[0] = 1; 125 pptr[1] = 1; 126 FAIL_IF(stop_trace(child)); 127 return TEST_PASS; 128 } 129 130 int ptrace_tm_spd_tar(void) 131 { 132 pid_t pid; 133 int ret, status; 134 135 SKIP_IF(!have_htm()); 136 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT); 137 pid = fork(); 138 if (pid == 0) 139 tm_spd_tar(); 140 141 pptr = (int *)shmat(shm_id, NULL, 0); 142 pptr[0] = 0; 143 pptr[1] = 0; 144 145 if (pid) { 146 while (!pptr[2]) 147 asm volatile("" : : : "memory"); 148 ret = trace_tm_spd_tar(pid); 149 if (ret) { 150 kill(pid, SIGTERM); 151 shmdt(&pptr); 152 shmctl(shm_id, IPC_RMID, NULL); 153 return TEST_FAIL; 154 } 155 156 shmdt(&pptr); 157 158 ret = wait(&status); 159 shmctl(shm_id, IPC_RMID, NULL); 160 if (ret != pid) { 161 printf("Child's exit status not captured\n"); 162 return TEST_FAIL; 163 } 164 165 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL : 166 TEST_PASS; 167 } 168 return TEST_PASS; 169 } 170 171 int main(int argc, char *argv[]) 172 { 173 return test_harness(ptrace_tm_spd_tar, "ptrace_tm_spd_tar"); 174 } 175