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
wait_parent(void)18 __attribute__((used)) void wait_parent(void)
19 {
20 cptr[2] = 1;
21 while (!cptr[1])
22 asm volatile("" : : : "memory");
23 }
24
tm_spd_tar(void)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 : [val] "r" (cptr[1]), [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
trace_tm_spd_tar(pid_t child)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
ptrace_tm_spd_tar(void)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
main(int argc,char * argv[])171 int main(int argc, char *argv[])
172 {
173 return test_harness(ptrace_tm_spd_tar, "ptrace_tm_spd_tar");
174 }
175