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 */ 12 int shm_id; 13 unsigned long *cptr, *pptr; 14 15 double a = FPR_1; 16 double b = FPR_2; 17 double c = FPR_3; 18 19 void tm_gpr(void) 20 { 21 unsigned long gpr_buf[18]; 22 unsigned long result, texasr; 23 double fpr_buf[32]; 24 25 printf("Starting the child\n"); 26 cptr = (unsigned long *)shmat(shm_id, NULL, 0); 27 28 trans: 29 cptr[1] = 0; 30 asm __volatile__( 31 ASM_LOAD_GPR_IMMED(gpr_1) 32 ASM_LOAD_FPR(flt_1) 33 "1: ;" 34 "tbegin.;" 35 "beq 2f;" 36 ASM_LOAD_GPR_IMMED(gpr_2) 37 ASM_LOAD_FPR(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", "r0", "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(fpr_buf); 74 75 if (validate_gpr(gpr_buf, GPR_3)) 76 exit(1); 77 78 if (validate_fpr_double(fpr_buf, c)) 79 exit(1); 80 81 exit(0); 82 } 83 shmdt((void *)cptr); 84 exit(1); 85 } 86 87 int trace_tm_gpr(pid_t child) 88 { 89 unsigned long gpr[18]; 90 __u64 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 } 109 110 int ptrace_tm_gpr(void) 111 { 112 pid_t pid; 113 int ret, status; 114 115 SKIP_IF_MSG(!have_htm(), "Don't have transactional memory"); 116 SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic"); 117 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT); 118 pid = fork(); 119 if (pid < 0) { 120 perror("fork() failed"); 121 return TEST_FAIL; 122 } 123 if (pid == 0) 124 tm_gpr(); 125 126 if (pid) { 127 pptr = (unsigned long *)shmat(shm_id, NULL, 0); 128 129 while (!pptr[1]) 130 asm volatile("" : : : "memory"); 131 ret = trace_tm_gpr(pid); 132 if (ret) { 133 kill(pid, SIGTERM); 134 return TEST_FAIL; 135 } 136 137 shmdt((void *)pptr); 138 139 ret = wait(&status); 140 shmctl(shm_id, IPC_RMID, NULL); 141 if (ret != pid) { 142 printf("Child's exit status not captured\n"); 143 return TEST_FAIL; 144 } 145 146 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL : 147 TEST_PASS; 148 } 149 return TEST_PASS; 150 } 151 152 int main(int argc, char *argv[]) 153 { 154 return test_harness(ptrace_tm_gpr, "ptrace_tm_gpr"); 155 } 156