1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Ptrace test for GPR/FPR registers in TM Suspend 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 int *cptr, *pptr;
14
15 float a = FPR_1;
16 float b = FPR_2;
17 float c = FPR_3;
18 float d = FPR_4;
19
wait_parent(void)20 __attribute__((used)) void wait_parent(void)
21 {
22 cptr[2] = 1;
23 while (!cptr[1])
24 asm volatile("" : : : "memory");
25 }
26
tm_spd_gpr(void)27 void tm_spd_gpr(void)
28 {
29 unsigned long gpr_buf[18];
30 unsigned long result, texasr;
31 float fpr_buf[32];
32
33 cptr = (int *)shmat(shm_id, NULL, 0);
34
35 trans:
36 cptr[2] = 0;
37 asm __volatile__(
38 ASM_LOAD_GPR_IMMED(gpr_1)
39 ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
40
41 "1: ;"
42 "tbegin.;"
43 "beq 2f;"
44
45 ASM_LOAD_GPR_IMMED(gpr_2)
46 "tsuspend.;"
47 ASM_LOAD_GPR_IMMED(gpr_4)
48 ASM_LOAD_FPR_SINGLE_PRECISION(flt_4)
49
50 "bl wait_parent;"
51 "tresume.;"
52 "tend.;"
53 "li 0, 0;"
54 "ori %[res], 0, 0;"
55 "b 3f;"
56
57 /* Transaction abort handler */
58 "2: ;"
59 "li 0, 1;"
60 "ori %[res], 0, 0;"
61 "mfspr %[texasr], %[sprn_texasr];"
62
63 "3: ;"
64 : [res] "=r" (result), [texasr] "=r" (texasr)
65 : [gpr_1]"i"(GPR_1), [gpr_2]"i"(GPR_2), [gpr_4]"i"(GPR_4),
66 [sprn_texasr] "i" (SPRN_TEXASR), [flt_1] "b" (&a),
67 [flt_4] "b" (&d)
68 : "memory", "r5", "r6", "r7",
69 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
70 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
71 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"
72 );
73
74 if (result) {
75 if (!cptr[0])
76 goto trans;
77
78 shmdt((void *)cptr);
79 store_gpr(gpr_buf);
80 store_fpr_single_precision(fpr_buf);
81
82 if (validate_gpr(gpr_buf, GPR_3))
83 exit(1);
84
85 if (validate_fpr_float(fpr_buf, c))
86 exit(1);
87 exit(0);
88 }
89 shmdt((void *)cptr);
90 exit(1);
91 }
92
trace_tm_spd_gpr(pid_t child)93 int trace_tm_spd_gpr(pid_t child)
94 {
95 unsigned long gpr[18];
96 unsigned long fpr[32];
97
98 FAIL_IF(start_trace(child));
99 FAIL_IF(show_gpr(child, gpr));
100 FAIL_IF(validate_gpr(gpr, GPR_4));
101 FAIL_IF(show_fpr(child, fpr));
102 FAIL_IF(validate_fpr(fpr, FPR_4_REP));
103 FAIL_IF(show_ckpt_fpr(child, fpr));
104 FAIL_IF(validate_fpr(fpr, FPR_1_REP));
105 FAIL_IF(show_ckpt_gpr(child, gpr));
106 FAIL_IF(validate_gpr(gpr, GPR_1));
107 FAIL_IF(write_ckpt_gpr(child, GPR_3));
108 FAIL_IF(write_ckpt_fpr(child, FPR_3_REP));
109
110 pptr[0] = 1;
111 pptr[1] = 1;
112 FAIL_IF(stop_trace(child));
113 return TEST_PASS;
114 }
115
ptrace_tm_spd_gpr(void)116 int ptrace_tm_spd_gpr(void)
117 {
118 pid_t pid;
119 int ret, status;
120
121 SKIP_IF(!have_htm());
122 shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
123 pid = fork();
124 if (pid < 0) {
125 perror("fork() failed");
126 return TEST_FAIL;
127 }
128
129 if (pid == 0)
130 tm_spd_gpr();
131
132 if (pid) {
133 pptr = (int *)shmat(shm_id, NULL, 0);
134 pptr[0] = 0;
135 pptr[1] = 0;
136
137 while (!pptr[2])
138 asm volatile("" : : : "memory");
139 ret = trace_tm_spd_gpr(pid);
140 if (ret) {
141 kill(pid, SIGTERM);
142 shmdt((void *)pptr);
143 shmctl(shm_id, IPC_RMID, NULL);
144 return TEST_FAIL;
145 }
146
147 shmdt((void *)pptr);
148
149 ret = wait(&status);
150 shmctl(shm_id, IPC_RMID, NULL);
151 if (ret != pid) {
152 printf("Child's exit status not captured\n");
153 return TEST_FAIL;
154 }
155
156 return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
157 TEST_PASS;
158 }
159 return TEST_PASS;
160 }
161
main(int argc,char * argv[])162 int main(int argc, char *argv[])
163 {
164 return test_harness(ptrace_tm_spd_gpr, "ptrace_tm_spd_gpr");
165 }
166