1 /*
2  * Ptrace test for GPR/FPR registers
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 "ptrace-gpr.h"
13 #include "reg.h"
14 
15 /* Tracer and Tracee Shared Data */
16 int shm_id;
17 int *cptr, *pptr;
18 
19 float a = FPR_1;
20 float b = FPR_2;
21 float c = FPR_3;
22 
23 void gpr(void)
24 {
25 	unsigned long gpr_buf[18];
26 	float fpr_buf[32];
27 
28 	cptr = (int *)shmat(shm_id, NULL, 0);
29 
30 	asm __volatile__(
31 		ASM_LOAD_GPR_IMMED(gpr_1)
32 		ASM_LOAD_FPR_SINGLE_PRECISION(flt_1)
33 		:
34 		: [gpr_1]"i"(GPR_1), [flt_1] "b" (&a)
35 		: "memory", "r6", "r7", "r8", "r9", "r10",
36 		"r11", "r12", "r13", "r14", "r15", "r16", "r17",
37 		"r18", "r19", "r20", "r21", "r22", "r23", "r24",
38 		"r25", "r26", "r27", "r28", "r29", "r30", "r31"
39 		);
40 
41 	cptr[1] = 1;
42 
43 	while (!cptr[0])
44 		asm volatile("" : : : "memory");
45 
46 	shmdt((void *)cptr);
47 	store_gpr(gpr_buf);
48 	store_fpr_single_precision(fpr_buf);
49 
50 	if (validate_gpr(gpr_buf, GPR_3))
51 		exit(1);
52 
53 	if (validate_fpr_float(fpr_buf, c))
54 		exit(1);
55 
56 	exit(0);
57 }
58 
59 int trace_gpr(pid_t child)
60 {
61 	unsigned long gpr[18];
62 	unsigned long fpr[32];
63 
64 	FAIL_IF(start_trace(child));
65 	FAIL_IF(show_gpr(child, gpr));
66 	FAIL_IF(validate_gpr(gpr, GPR_1));
67 	FAIL_IF(show_fpr(child, fpr));
68 	FAIL_IF(validate_fpr(fpr, FPR_1_REP));
69 	FAIL_IF(write_gpr(child, GPR_3));
70 	FAIL_IF(write_fpr(child, FPR_3_REP));
71 	FAIL_IF(stop_trace(child));
72 
73 	return TEST_PASS;
74 }
75 
76 int ptrace_gpr(void)
77 {
78 	pid_t pid;
79 	int ret, status;
80 
81 	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
82 	pid = fork();
83 	if (pid < 0) {
84 		perror("fork() failed");
85 		return TEST_FAIL;
86 	}
87 	if (pid == 0)
88 		gpr();
89 
90 	if (pid) {
91 		pptr = (int *)shmat(shm_id, NULL, 0);
92 		while (!pptr[1])
93 			asm volatile("" : : : "memory");
94 
95 		ret = trace_gpr(pid);
96 		if (ret) {
97 			kill(pid, SIGTERM);
98 			shmdt((void *)pptr);
99 			shmctl(shm_id, IPC_RMID, NULL);
100 			return TEST_FAIL;
101 		}
102 
103 		pptr[0] = 1;
104 		shmdt((void *)pptr);
105 
106 		ret = wait(&status);
107 		shmctl(shm_id, IPC_RMID, NULL);
108 		if (ret != pid) {
109 			printf("Child's exit status not captured\n");
110 			return TEST_FAIL;
111 		}
112 
113 		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
114 			TEST_PASS;
115 	}
116 
117 	return TEST_PASS;
118 }
119 
120 int main(int argc, char *argv[])
121 {
122 	return test_harness(ptrace_gpr, "ptrace_gpr");
123 }
124