| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | * |
| 6 | * LTTng UST Instruction Pointer Context. |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include <stddef.h> |
| 11 | #include <sys/types.h> |
| 12 | #include <unistd.h> |
| 13 | #include <lttng/ust-events.h> |
| 14 | #include <lttng/ust-tracer.h> |
| 15 | #include <lttng/ringbuffer-config.h> |
| 16 | |
| 17 | #include "context-internal.h" |
| 18 | |
| 19 | static |
| 20 | size_t ip_get_size(struct lttng_ctx_field *field, size_t offset) |
| 21 | { |
| 22 | size_t size = 0; |
| 23 | |
| 24 | size += lib_ring_buffer_align(offset, lttng_alignof(void *)); |
| 25 | size += sizeof(void *); |
| 26 | return size; |
| 27 | } |
| 28 | |
| 29 | static |
| 30 | void ip_record(struct lttng_ctx_field *field, |
| 31 | struct lttng_ust_lib_ring_buffer_ctx *ctx, |
| 32 | struct lttng_channel *chan) |
| 33 | { |
| 34 | void *ip; |
| 35 | |
| 36 | ip = ctx->ip; |
| 37 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(ip)); |
| 38 | chan->ops->event_write(ctx, &ip, sizeof(ip)); |
| 39 | } |
| 40 | |
| 41 | int lttng_add_ip_to_ctx(struct lttng_ctx **ctx) |
| 42 | { |
| 43 | struct lttng_ctx_field *field; |
| 44 | |
| 45 | field = lttng_append_context(ctx); |
| 46 | if (!field) |
| 47 | return -ENOMEM; |
| 48 | if (lttng_find_context(*ctx, "ip")) { |
| 49 | lttng_remove_context_field(ctx, field); |
| 50 | return -EEXIST; |
| 51 | } |
| 52 | field->event_field.name = "ip"; |
| 53 | field->event_field.type.atype = atype_integer; |
| 54 | field->event_field.type.u.integer.size = sizeof(void *) * CHAR_BIT; |
| 55 | field->event_field.type.u.integer.alignment = lttng_alignof(void *) * CHAR_BIT; |
| 56 | field->event_field.type.u.integer.signedness = lttng_is_signed_type(void *); |
| 57 | field->event_field.type.u.integer.reverse_byte_order = 0; |
| 58 | field->event_field.type.u.integer.base = 16; |
| 59 | field->event_field.type.u.integer.encoding = lttng_encode_none; |
| 60 | field->get_size = ip_get_size; |
| 61 | field->record = ip_record; |
| 62 | lttng_context_update(*ctx); |
| 63 | return 0; |
| 64 | } |