summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
blob: f9b5069db89ba3181f9caaf3ffcdf3f139c23879 (plain) (blame)
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
/*
 * Ptrace test for TAR, PPR, DSCR registers
 *
 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include "ptrace.h"
#include "ptrace-tar.h"

/* Tracer and Tracee Shared Data */
int shm_id;
int *cptr;
int *pptr;

void tar(void)
{
	unsigned long reg[3];
	int ret;

	cptr = (int *)shmat(shm_id, NULL, 0);
	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
			user_write, TAR_1, PPR_1, DSCR_1);

	mtspr(SPRN_TAR, TAR_1);
	mtspr(SPRN_PPR, PPR_1);
	mtspr(SPRN_DSCR, DSCR_1);

	cptr[2] = 1;

	/* Wait on parent */
	while (!cptr[0])
		asm volatile("" : : : "memory");

	reg[0] = mfspr(SPRN_TAR);
	reg[1] = mfspr(SPRN_PPR);
	reg[2] = mfspr(SPRN_DSCR);

	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
			user_read, reg[0], reg[1], reg[2]);

	/* Unblock the parent now */
	cptr[1] = 1;
	shmdt((int *)cptr);

	ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
	if (ret)
		exit(1);
	exit(0);
}

int trace_tar(pid_t child)
{
	unsigned long reg[3];

	FAIL_IF(start_trace(child));
	FAIL_IF(show_tar_registers(child, reg));
	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
			ptrace_read_running, reg[0], reg[1], reg[2]);

	FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
	FAIL_IF(stop_trace(child));
	return TEST_PASS;
}

int trace_tar_write(pid_t child)
{
	FAIL_IF(start_trace(child));
	FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
			ptrace_write_running, TAR_2, PPR_2, DSCR_2);

	FAIL_IF(stop_trace(child));
	return TEST_PASS;
}

int ptrace_tar(void)
{
	pid_t pid;
	int ret, status;

	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
	pid = fork();
	if (pid < 0) {
		perror("fork() failed");
		return TEST_FAIL;
	}

	if (pid == 0)
		tar();

	if (pid) {
		pptr = (int *)shmat(shm_id, NULL, 0);
		pptr[0] = 0;
		pptr[1] = 0;

		while (!pptr[2])
			asm volatile("" : : : "memory");
		ret = trace_tar(pid);
		if (ret)
			return ret;

		ret = trace_tar_write(pid);
		if (ret)
			return ret;

		/* Unblock the child now */
		pptr[0] = 1;

		/* Wait on child */
		while (!pptr[1])
			asm volatile("" : : : "memory");

		shmdt((int *)pptr);

		ret = wait(&status);
		shmctl(shm_id, IPC_RMID, NULL);
		if (ret != pid) {
			printf("Child's exit status not captured\n");
			return TEST_PASS;
		}

		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
			TEST_PASS;
	}
	return TEST_PASS;
}

int main(int argc, char *argv[])
{
	return test_harness(ptrace_tar, "ptrace_tar");
}