| 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 <limits.h> |
| 11 | #include <stddef.h> |
| 12 | #include <sys/types.h> |
| 13 | #include <unistd.h> |
| 14 | #include <lttng/ust-events.h> |
| 15 | #include <lttng/ust-tracer.h> |
| 16 | #include <lttng/ust-ringbuffer-context.h> |
| 17 | |
| 18 | #include "context-internal.h" |
| 19 | |
| 20 | static |
| 21 | size_t ip_get_size(void *priv __attribute__((unused)), |
| 22 | struct lttng_ust_probe_ctx *probe_ctx __attribute__((unused)), |
| 23 | size_t offset) |
| 24 | { |
| 25 | size_t size = 0; |
| 26 | |
| 27 | size += lttng_ust_ring_buffer_align(offset, lttng_ust_rb_alignof(void *)); |
| 28 | size += sizeof(void *); |
| 29 | return size; |
| 30 | } |
| 31 | |
| 32 | static |
| 33 | void ip_record(void *priv __attribute__((unused)), |
| 34 | struct lttng_ust_probe_ctx *probe_ctx, |
| 35 | struct lttng_ust_ring_buffer_ctx *ctx, |
| 36 | struct lttng_ust_channel_buffer *chan) |
| 37 | { |
| 38 | void *ip; |
| 39 | |
| 40 | ip = probe_ctx->ip; |
| 41 | chan->ops->event_write(ctx, &ip, sizeof(ip), lttng_ust_rb_alignof(ip)); |
| 42 | } |
| 43 | |
| 44 | static |
| 45 | void ip_get_value(void *priv __attribute__((unused)), |
| 46 | struct lttng_ust_probe_ctx *probe_ctx, |
| 47 | struct lttng_ust_ctx_value *value) |
| 48 | { |
| 49 | value->u.u64 = (unsigned long) probe_ctx->ip; |
| 50 | } |
| 51 | |
| 52 | static const struct lttng_ust_ctx_field *ctx_field = lttng_ust_static_ctx_field( |
| 53 | lttng_ust_static_event_field("ip", |
| 54 | lttng_ust_static_type_integer(sizeof(void *) * CHAR_BIT, |
| 55 | lttng_ust_rb_alignof(void *) * CHAR_BIT, |
| 56 | lttng_ust_is_signed_type(void *), |
| 57 | LTTNG_UST_BYTE_ORDER, 16), |
| 58 | false, false), |
| 59 | ip_get_size, |
| 60 | ip_record, |
| 61 | ip_get_value, |
| 62 | NULL, NULL); |
| 63 | |
| 64 | int lttng_add_ip_to_ctx(struct lttng_ust_ctx **ctx) |
| 65 | { |
| 66 | int ret; |
| 67 | |
| 68 | if (lttng_find_context(*ctx, ctx_field->event_field->name)) { |
| 69 | ret = -EEXIST; |
| 70 | goto error_find_context; |
| 71 | } |
| 72 | ret = lttng_ust_context_append(ctx, ctx_field); |
| 73 | if (ret) |
| 74 | return ret; |
| 75 | return 0; |
| 76 | |
| 77 | error_find_context: |
| 78 | return ret; |
| 79 | } |