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