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96f85541 MD |
1 | /* |
2 | * lttng-context-ip.c | |
3 | * | |
4 | * LTTng UST Instruction Pointer Context. | |
5 | * | |
6 | * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
3fbec7dc | 23 | #define _LGPL_SOURCE |
b4051ad8 | 24 | #include <stddef.h> |
96f85541 MD |
25 | #include <sys/types.h> |
26 | #include <unistd.h> | |
27 | #include <lttng/ust-events.h> | |
28 | #include <lttng/ust-tracer.h> | |
29 | #include <lttng/ringbuffer-config.h> | |
30 | ||
31 | static | |
53569322 | 32 | size_t ip_get_size(struct lttng_ctx_field *field, size_t offset) |
96f85541 MD |
33 | { |
34 | size_t size = 0; | |
35 | ||
36 | size += lib_ring_buffer_align(offset, lttng_alignof(void *)); | |
37 | size += sizeof(void *); | |
38 | return size; | |
39 | } | |
40 | ||
41 | static | |
42 | void ip_record(struct lttng_ctx_field *field, | |
43 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
44 | struct lttng_channel *chan) | |
45 | { | |
46 | void *ip; | |
47 | ||
48 | ip = ctx->ip; | |
49 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(ip)); | |
50 | chan->ops->event_write(ctx, &ip, sizeof(ip)); | |
51 | } | |
52 | ||
53 | int lttng_add_ip_to_ctx(struct lttng_ctx **ctx) | |
54 | { | |
55 | struct lttng_ctx_field *field; | |
56 | ||
57 | field = lttng_append_context(ctx); | |
58 | if (!field) | |
59 | return -ENOMEM; | |
60 | if (lttng_find_context(*ctx, "ip")) { | |
61 | lttng_remove_context_field(ctx, field); | |
62 | return -EEXIST; | |
63 | } | |
64 | field->event_field.name = "ip"; | |
65 | field->event_field.type.atype = atype_integer; | |
218deb69 MD |
66 | field->event_field.type.u.integer.size = sizeof(void *) * CHAR_BIT; |
67 | field->event_field.type.u.integer.alignment = lttng_alignof(void *) * CHAR_BIT; | |
68 | field->event_field.type.u.integer.signedness = lttng_is_signed_type(void *); | |
69 | field->event_field.type.u.integer.reverse_byte_order = 0; | |
70 | field->event_field.type.u.integer.base = 16; | |
71 | field->event_field.type.u.integer.encoding = lttng_encode_none; | |
96f85541 MD |
72 | field->get_size = ip_get_size; |
73 | field->record = ip_record; | |
b2cc986a | 74 | lttng_context_update(*ctx); |
96f85541 MD |
75 | return 0; |
76 | } |