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
11 int shm_id;
12 unsigned long *cptr, *pptr;
13
14
15 void 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
23 trans:
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
90 int 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
114 int ptrace_tm_tar(void)
115 {
116 pid_t pid;
117 int ret, status;
118
119 SKIP_IF_MSG(!have_htm(), "Don't have transactional memory");
120 SKIP_IF_MSG(htm_is_synthetic(), "Transactional memory is synthetic");
121 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
122 pid = fork();
123 if (pid == 0)
124 tm_tar();
125
126 pptr = (unsigned long *)shmat(shm_id, NULL, 0);
127 pptr[0] = 0;
128
129 if (pid) {
130 while (!pptr[1])
131 asm volatile("" : : : "memory");
132 ret = trace_tm_tar(pid);
133 if (ret) {
134 kill(pid, SIGTERM);
135 shmdt(&pptr);
136 shmctl(shm_id, IPC_RMID, NULL);
137 return TEST_FAIL;
138 }
139 shmdt(&pptr);
140
141 ret = wait(&status);
142 shmctl(shm_id, IPC_RMID, NULL);
143 if (ret != pid) {
144 printf("Child's exit status not captured\n");
145 return TEST_FAIL;
146 }
147
148 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
149 TEST_PASS;
150 }
151 return TEST_PASS;
152 }
153
154 int main(int argc, char *argv[])
155 {
156 return test_harness(ptrace_tm_tar, "ptrace_tm_tar");
157 }
158
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