1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ptrace test for GPR/FPR registers
*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*/
#include "ptrace.h"
#include "ptrace-gpr.h"
#include "reg.h"
#include <time.h>
/* Tracer and Tracee Shared Data */
int shm_id;
int *cptr, *pptr;
extern void gpr_child_loop(int *read_flag, int *write_flag,
unsigned long *gpr_buf, double *fpr_buf);
unsigned long child_gpr_val, parent_gpr_val;
double child_fpr_val, parent_fpr_val;
static int child(void)
{
unsigned long gpr_buf[32];
double fpr_buf[32];
int i;
cptr = (int *)shmat(shm_id, NULL, 0);
memset(gpr_buf, 0, sizeof(gpr_buf));
memset(fpr_buf, 0, sizeof(fpr_buf));
for (i = 0; i < 32; i++) {
gpr_buf[i] = child_gpr_val;
fpr_buf[i] = child_fpr_val;
}
gpr_child_loop(&cptr[0], &cptr[1], gpr_buf, fpr_buf);
shmdt((void *)cptr);
FAIL_IF(validate_gpr(gpr_buf, parent_gpr_val));
FAIL_IF(validate_fpr_double(fpr_buf, parent_fpr_val));
return 0;
}
int trace_gpr(pid_t child)
{
__u64 tmp, fpr[32], *peeked_fprs;
unsigned long gpr[18];
FAIL_IF(start_trace(child));
// Check child GPRs match what we expect using GETREGS
FAIL_IF(show_gpr(child, gpr));
FAIL_IF(validate_gpr(gpr, child_gpr_val));
// Check child FPRs match what we expect using GETFPREGS
FAIL_IF(show_fpr(child, fpr));
memcpy(&tmp, &child_fpr_val, sizeof(tmp));
FAIL_IF(validate_fpr(fpr, tmp));
// Check child FPRs match what we expect using PEEKUSR
peeked_fprs = peek_fprs(child);
FAIL_IF(!peeked_fprs);
FAIL_IF(validate_fpr(peeked_fprs, tmp));
free(peeked_fprs);
// Write child GPRs using SETREGS
FAIL_IF(write_gpr(child, parent_gpr_val));
// Write child FPRs using SETFPREGS
memcpy(&tmp, &parent_fpr_val, sizeof(tmp));
FAIL_IF(write_fpr(child, tmp));
// Check child FPRs match what we just set, using PEEKUSR
peeked_fprs = peek_fprs(child);
FAIL_IF(!peeked_fprs);
FAIL_IF(validate_fpr(peeked_fprs, tmp));
// Write child FPRs using POKEUSR
FAIL_IF(poke_fprs(child, (unsigned long *)peeked_fprs));
// Child will check its FPRs match before exiting
FAIL_IF(stop_trace(child));
return TEST_PASS;
}
#ifndef __LONG_WIDTH__
#define __LONG_WIDTH__ (sizeof(long) * 8)
#endif
static uint64_t rand_reg(void)
{
uint64_t result;
long r;
r = random();
// Small values are typical
result = r & 0xffff;
if (r & 0x10000)
return result;
// Pointers tend to have high bits set
result |= random() << (__LONG_WIDTH__ - 31);
if (r & 0x100000)
return result;
// And sometimes we want a full 64-bit value
result ^= random() << 16;
return result;
}
int ptrace_gpr(void)
{
unsigned long seed;
int ret, status;
pid_t pid;
seed = getpid() ^ time(NULL);
printf("srand(%lu)\n", seed);
srand(seed);
child_gpr_val = rand_reg();
child_fpr_val = rand_reg();
parent_gpr_val = rand_reg();
parent_fpr_val = rand_reg();
shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
pid = fork();
if (pid < 0) {
perror("fork() failed");
return TEST_FAIL;
}
if (pid == 0)
exit(child());
if (pid) {
pptr = (int *)shmat(shm_id, NULL, 0);
while (!pptr[1])
asm volatile("" : : : "memory");
ret = trace_gpr(pid);
if (ret) {
kill(pid, SIGTERM);
shmdt((void *)pptr);
shmctl(shm_id, IPC_RMID, NULL);
return TEST_FAIL;
}
pptr[0] = 1;
shmdt((void *)pptr);
ret = wait(&status);
shmctl(shm_id, IPC_RMID, NULL);
if (ret != pid) {
printf("Child's exit status not captured\n");
return TEST_FAIL;
}
return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
TEST_PASS;
}
return TEST_PASS;
}
int main(int argc, char *argv[])
{
return test_harness(ptrace_gpr, "ptrace_gpr");
}
|
