xref: /freebsd/cddl/contrib/opensolaris/lib/libdtrace/riscv/dt_isadep.c (revision 0957b409a90fd597c1e9124cbaf3edd2b488f4ac)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  * Copyright 2014 Howard Su
26  * Copyright 2015 George V. Neville-Neil
27  * Copyright 2015 Ruslan Bukin <br@bsdpad.com>
28  */
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #include <stdlib.h>
33 #include <assert.h>
34 #include <errno.h>
35 #include <string.h>
36 #include <libgen.h>
37 
38 #include <dt_impl.h>
39 #include <dt_pid.h>
40 
41 #if !defined(sun)
42 #include <libproc_compat.h>
43 #endif
44 
45 /*ARGSUSED*/
46 int
47 dt_pid_create_entry_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
48     fasttrap_probe_spec_t *ftp, const GElf_Sym *symp)
49 {
50 
51 	ftp->ftps_type = DTFTP_ENTRY;
52 	ftp->ftps_pc = (uintptr_t)symp->st_value;
53 	ftp->ftps_size = (size_t)symp->st_size;
54 	ftp->ftps_noffs = 1;
55 	ftp->ftps_offs[0] = 0;
56 
57 	if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
58 		dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
59 		    strerror(errno));
60 		return (dt_set_errno(dtp, errno));
61 	}
62 
63 	return (1);
64 }
65 
66 int
67 dt_pid_create_return_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
68     fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, uint64_t *stret)
69 {
70 
71 	dt_dprintf("%s: unimplemented\n", __func__);
72 
73 	return (DT_PROC_ERR);
74 }
75 
76 /*ARGSUSED*/
77 int
78 dt_pid_create_offset_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
79     fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, ulong_t off)
80 {
81 
82 	if (!ALIGNED_POINTER(off, 4))
83 		return (DT_PROC_ALIGN);
84 
85 	ftp->ftps_type = DTFTP_OFFSETS;
86 	ftp->ftps_pc = (uintptr_t)symp->st_value;
87 	ftp->ftps_size = (size_t)symp->st_size;
88 	ftp->ftps_noffs = 1;
89 	ftp->ftps_offs[0] = off;
90 
91 	if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
92 		dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
93 		    strerror(errno));
94 		return (dt_set_errno(dtp, errno));
95 	}
96 
97 	return (1);
98 }
99 
100 /*ARGSUSED*/
101 int
102 dt_pid_create_glob_offset_probes(struct ps_prochandle *P, dtrace_hdl_t *dtp,
103     fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, const char *pattern)
104 {
105 	ulong_t i;
106 
107 	ftp->ftps_type = DTFTP_OFFSETS;
108 	ftp->ftps_pc = (uintptr_t)symp->st_value;
109 	ftp->ftps_size = (size_t)symp->st_size;
110 	ftp->ftps_noffs = 0;
111 
112 	/*
113 	 * If we're matching against everything, just iterate through each
114 	 * instruction in the function, otherwise look for matching offset
115 	 * names by constructing the string and comparing it against the
116 	 * pattern.
117 	 */
118 	if (strcmp("*", pattern) == 0) {
119 		for (i = 0; i < symp->st_size; i += 4) {
120 			ftp->ftps_offs[ftp->ftps_noffs++] = i;
121 		}
122 	} else {
123 		char name[sizeof (i) * 2 + 1];
124 
125 		for (i = 0; i < symp->st_size; i += 4) {
126 			(void) sprintf(name, "%lx", i);
127 			if (gmatch(name, pattern))
128 				ftp->ftps_offs[ftp->ftps_noffs++] = i;
129 		}
130 	}
131 
132 	if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
133 		dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
134 		    strerror(errno));
135 		return (dt_set_errno(dtp, errno));
136 	}
137 
138 	return (ftp->ftps_noffs);
139 }
140