1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Ptrace test for TAR, PPR, DSCR registers in the TM Suspend 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 int *cptr, *pptr;
13
wait_parent(void)14 __attribute__((used)) void wait_parent(void)
15 {
16 cptr[2] = 1;
17 while (!cptr[1])
18 asm volatile("" : : : "memory");
19 }
20
tm_spd_tar(void)21 void tm_spd_tar(void)
22 {
23 unsigned long result, texasr;
24 unsigned long regs[3];
25 int ret;
26
27 cptr = (int *)shmat(shm_id, NULL, 0);
28
29 trans:
30 cptr[2] = 0;
31 asm __volatile__(
32 "li 4, %[tar_1];"
33 "mtspr %[sprn_tar], 4;" /* TAR_1 */
34 "li 4, %[dscr_1];"
35 "mtspr %[sprn_dscr], 4;" /* DSCR_1 */
36 "or 31,31,31;" /* PPR_1*/
37
38 "1: ;"
39 "tbegin.;"
40 "beq 2f;"
41
42 "li 4, %[tar_2];"
43 "mtspr %[sprn_tar], 4;" /* TAR_2 */
44 "li 4, %[dscr_2];"
45 "mtspr %[sprn_dscr], 4;" /* DSCR_2 */
46 "or 1,1,1;" /* PPR_2 */
47
48 "tsuspend.;"
49 "li 4, %[tar_3];"
50 "mtspr %[sprn_tar], 4;" /* TAR_3 */
51 "li 4, %[dscr_3];"
52 "mtspr %[sprn_dscr], 4;" /* DSCR_3 */
53 "or 6,6,6;" /* PPR_3 */
54 "bl wait_parent;"
55 "tresume.;"
56
57 "tend.;"
58 "li 0, 0;"
59 "ori %[res], 0, 0;"
60 "b 3f;"
61
62 /* Transaction abort handler */
63 "2: ;"
64 "li 0, 1;"
65 "ori %[res], 0, 0;"
66 "mfspr %[texasr], %[sprn_texasr];"
67
68 "3: ;"
69
70 : [res] "=r" (result), [texasr] "=r" (texasr)
71 : [sprn_dscr]"i"(SPRN_DSCR),
72 [sprn_tar]"i"(SPRN_TAR), [sprn_ppr]"i"(SPRN_PPR),
73 [sprn_texasr]"i"(SPRN_TEXASR), [tar_1]"i"(TAR_1),
74 [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2),
75 [tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3)
76 : "memory", "r0", "r3", "r4", "r5", "r6", "lr"
77 );
78
79 /* TM failed, analyse */
80 if (result) {
81 if (!cptr[0])
82 goto trans;
83
84 regs[0] = mfspr(SPRN_TAR);
85 regs[1] = mfspr(SPRN_PPR);
86 regs[2] = mfspr(SPRN_DSCR);
87
88 shmdt(&cptr);
89 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
90 user_read, regs[0], regs[1], regs[2]);
91
92 ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
93 if (ret)
94 exit(1);
95 exit(0);
96 }
97 shmdt(&cptr);
98 exit(1);
99 }
100
trace_tm_spd_tar(pid_t child)101 int trace_tm_spd_tar(pid_t child)
102 {
103 unsigned long regs[3];
104
105 FAIL_IF(start_trace(child));
106 FAIL_IF(show_tar_registers(child, regs));
107 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
108 ptrace_read_running, regs[0], regs[1], regs[2]);
109
110 FAIL_IF(validate_tar_registers(regs, TAR_3, PPR_3, DSCR_3));
111 FAIL_IF(show_tm_checkpointed_state(child, regs));
112 printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
113 ptrace_read_ckpt, regs[0], regs[1], regs[2]);
114
115 FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
116 FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
117 printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
118 ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
119
120 pptr[0] = 1;
121 pptr[1] = 1;
122 FAIL_IF(stop_trace(child));
123 return TEST_PASS;
124 }
125
ptrace_tm_spd_tar(void)126 int ptrace_tm_spd_tar(void)
127 {
128 pid_t pid;
129 int ret, status;
130
131 SKIP_IF(!have_htm());
132 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
133 pid = fork();
134 if (pid == 0)
135 tm_spd_tar();
136
137 pptr = (int *)shmat(shm_id, NULL, 0);
138 pptr[0] = 0;
139 pptr[1] = 0;
140
141 if (pid) {
142 while (!pptr[2])
143 asm volatile("" : : : "memory");
144 ret = trace_tm_spd_tar(pid);
145 if (ret) {
146 kill(pid, SIGTERM);
147 shmdt(&pptr);
148 shmctl(shm_id, IPC_RMID, NULL);
149 return TEST_FAIL;
150 }
151
152 shmdt(&pptr);
153
154 ret = wait(&status);
155 shmctl(shm_id, IPC_RMID, NULL);
156 if (ret != pid) {
157 printf("Child's exit status not captured\n");
158 return TEST_FAIL;
159 }
160
161 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
162 TEST_PASS;
163 }
164 return TEST_PASS;
165 }
166
main(int argc,char * argv[])167 int main(int argc, char *argv[])
168 {
169 return test_harness(ptrace_tm_spd_tar, "ptrace_tm_spd_tar");
170 }
171