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 *
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 #ifdef __FreeBSD__
42 #include <libproc_compat.h>
43 #endif
44
45 #define OP(x) ((x) >> 30)
46 #define OP2(x) (((x) >> 22) & 0x07)
47 #define COND(x) (((x) >> 25) & 0x0f)
48 #define A(x) (((x) >> 29) & 0x01)
49
50 #define OP_BRANCH 0
51
52 #define OP2_BPcc 0x1
53 #define OP2_Bicc 0x2
54 #define OP2_BPr 0x3
55 #define OP2_FBPfcc 0x5
56 #define OP2_FBfcc 0x6
57
58 /*ARGSUSED*/
59 int
dt_pid_create_entry_probe(struct ps_prochandle * P,dtrace_hdl_t * dtp,fasttrap_probe_spec_t * ftp,const GElf_Sym * symp)60 dt_pid_create_entry_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
61 fasttrap_probe_spec_t *ftp, const GElf_Sym *symp)
62 {
63 ftp->ftps_type = DTFTP_ENTRY;
64 ftp->ftps_pc = (uintptr_t)symp->st_value;
65 ftp->ftps_size = (size_t)symp->st_size;
66 ftp->ftps_noffs = 1;
67 ftp->ftps_offs[0] = 0;
68
69 if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
70 dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
71 strerror(errno));
72 return (dt_set_errno(dtp, errno));
73 }
74
75 return (1);
76 }
77
78 int
dt_pid_create_return_probe(struct ps_prochandle * P,dtrace_hdl_t * dtp,fasttrap_probe_spec_t * ftp,const GElf_Sym * symp,uint64_t * stret)79 dt_pid_create_return_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
80 fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, uint64_t *stret)
81 {
82
83 uint32_t *text;
84 int i;
85 int srdepth = 0;
86
87 dt_dprintf("%s: unimplemented\n", __func__);
88 return (DT_PROC_ERR);
89
90 if ((text = malloc(symp->st_size + 4)) == NULL) {
91 dt_dprintf("mr sparkle: malloc() failed\n");
92 return (DT_PROC_ERR);
93 }
94
95 if (Pread(P, text, symp->st_size, symp->st_value) != symp->st_size) {
96 dt_dprintf("mr sparkle: Pread() failed\n");
97 free(text);
98 return (DT_PROC_ERR);
99 }
100
101 /*
102 * Leave a dummy instruction in the last slot to simplify edge
103 * conditions.
104 */
105 text[symp->st_size / 4] = 0;
106
107 ftp->ftps_type = DTFTP_RETURN;
108 ftp->ftps_pc = symp->st_value;
109 ftp->ftps_size = symp->st_size;
110 ftp->ftps_noffs = 0;
111
112
113 free(text);
114 if (ftp->ftps_noffs > 0) {
115 if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
116 dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
117 strerror(errno));
118 return (dt_set_errno(dtp, errno));
119 }
120 }
121
122
123 return (ftp->ftps_noffs);
124 }
125
126 /*ARGSUSED*/
127 int
dt_pid_create_offset_probe(struct ps_prochandle * P,dtrace_hdl_t * dtp,fasttrap_probe_spec_t * ftp,const GElf_Sym * symp,ulong_t off)128 dt_pid_create_offset_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
129 fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, ulong_t off)
130 {
131 if (off & 0x3)
132 return (DT_PROC_ALIGN);
133
134 ftp->ftps_type = DTFTP_OFFSETS;
135 ftp->ftps_pc = (uintptr_t)symp->st_value;
136 ftp->ftps_size = (size_t)symp->st_size;
137 ftp->ftps_noffs = 1;
138 ftp->ftps_offs[0] = off;
139
140 if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
141 dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
142 strerror(errno));
143 return (dt_set_errno(dtp, errno));
144 }
145
146 return (1);
147 }
148
149 /*ARGSUSED*/
150 int
dt_pid_create_glob_offset_probes(struct ps_prochandle * P,dtrace_hdl_t * dtp,fasttrap_probe_spec_t * ftp,const GElf_Sym * symp,const char * pattern)151 dt_pid_create_glob_offset_probes(struct ps_prochandle *P, dtrace_hdl_t *dtp,
152 fasttrap_probe_spec_t *ftp, const GElf_Sym *symp, const char *pattern)
153 {
154 ulong_t i;
155
156 ftp->ftps_type = DTFTP_OFFSETS;
157 ftp->ftps_pc = (uintptr_t)symp->st_value;
158 ftp->ftps_size = (size_t)symp->st_size;
159 ftp->ftps_noffs = 0;
160
161 /*
162 * If we're matching against everything, just iterate through each
163 * instruction in the function, otherwise look for matching offset
164 * names by constructing the string and comparing it against the
165 * pattern.
166 */
167 if (strcmp("*", pattern) == 0) {
168 for (i = 0; i < symp->st_size; i += 4) {
169 ftp->ftps_offs[ftp->ftps_noffs++] = i;
170 }
171 } else {
172 char name[sizeof (i) * 2 + 1];
173
174 for (i = 0; i < symp->st_size; i += 4) {
175 (void) sprintf(name, "%lx", i);
176 if (gmatch(name, pattern))
177 ftp->ftps_offs[ftp->ftps_noffs++] = i;
178 }
179 }
180
181 if (ioctl(dtp->dt_ftfd, FASTTRAPIOC_MAKEPROBE, ftp) != 0) {
182 dt_dprintf("fasttrap probe creation ioctl failed: %s\n",
183 strerror(errno));
184 return (dt_set_errno(dtp, errno));
185 }
186
187 return (ftp->ftps_noffs);
188 }
189