--- /dev/null
+#ifndef _BABELTRACE_SO_INFO_H
+#define _BABELTRACE_SO_INFO_H
+
+/*
+ * Babeltrace - Executable and Shared Object Debug Info Reader
+ *
+ * Copyright 2015 Antoine Busque <abusque@efficios.com>
+ *
+ * Author: Antoine Busque <abusque@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <gelf.h>
+#include <elfutils/libdw.h>
+#include <babeltrace/babeltrace-internal.h>
+
+#define DEFAULT_DEBUG_DIR "/usr/lib/debug"
+#define DEBUG_SUBDIR ".debug/"
+#define BUILD_ID_SUBDIR ".build-id/"
+#define BUILD_ID_SUFFIX ".debug"
+
+struct so_info {
+ /* Base virtual memory address. */
+ uint64_t low_addr;
+ /* Upper bound of exec address space. */
+ uint64_t high_addr;
+ /* Size of exec address space. */
+ uint64_t memsz;
+ /* Paths to ELF and DWARF files. */
+ char *elf_path;
+ char *dwarf_path;
+ /* libelf and libdw objects representing the files. */
+ Elf *elf_file;
+ Dwarf *dwarf_info;
+ /* Optional build ID info. */
+ uint8_t *build_id;
+ size_t build_id_len;
+ /* Optional debug link info. */
+ char *dbg_link_filename;
+ uint32_t dbg_link_crc;
+ /* FDs to ELF and DWARF files. */
+ int elf_fd;
+ int dwarf_fd;
+ /* Denotes whether the executable is position independent code. */
+ bool is_pic:1;
+ /* Denotes whether the SO only has ELF symbols and no DWARF info. */
+ bool is_elf_only:1;
+};
+
+struct source_location {
+ uint64_t line_no;
+ char *filename;
+};
+
+/**
+ * Initializes the so_info framework. Call this before calling
+ * anything else.
+ *
+ * @returns 0 on success, -1 on failure
+ */
+BT_HIDDEN
+int so_info_init(void);
+
+/**
+ * Instantiate a structure representing an ELF executable, possibly
+ * with DWARF info, located at the given path.
+ *
+ * @param path Path to the ELF file
+ * @param low_addr Base address of the executable
+ * @param memsz In-memory size of the executable
+ * @returns Pointer to the new so_info on success,
+ * NULL on failure.
+ */
+BT_HIDDEN
+struct so_info *so_info_create(const char *path, uint64_t low_addr,
+ uint64_t memsz);
+
+/**
+ * Destroy the given so_info instance
+ *
+ * @param so so_info instance to destroy
+ */
+BT_HIDDEN
+void so_info_destroy(struct so_info *so);
+
+/**
+ * Sets the build ID information for a given so_info instance.
+ *
+ * @param so The so_info instance for which to set
+ * the build ID
+ * @param build_id Array of bytes containing the actual ID
+ * @param build_id_len Length in bytes of the build_id
+ * @returns 0 on success, -1 on failure
+ */
+BT_HIDDEN
+int so_info_set_build_id(struct so_info *so, uint8_t *build_id,
+ size_t build_id_len);
+
+/**
+ * Sets the debug link information for a given so_info instance.
+ *
+ * @param so The so_info instance for which to set
+ * the debug link
+ * @param filename Name of the separate debug info file
+ * @param crc Checksum for the debug info file
+ * @returns 0 on success, -1 on failure
+ */
+BT_HIDDEN
+int so_info_set_debug_link(struct so_info *so, char *filename, uint32_t crc);
+
+/**
+ * Returns whether or not the given SO info \p so contains the address
+ * \p addr.
+ *
+ * @param so so_info instance
+ * @param addr Address to lookup
+ * @returns 1 if \p so contains \p addr, 0 if it does not,
+ * -1 on failure
+ */
+static inline
+int so_info_has_address(struct so_info *so, uint64_t addr)
+{
+ if (!so) {
+ return -1;
+ }
+
+ return addr >= so->low_addr && addr < so->high_addr;
+}
+
+/**
+ * Get the name of the function containing a given address within an
+ * executable.
+ *
+ * If no DWARF info is available, the function falls back to ELF
+ * symbols and the "function name" is in fact the name of the closest
+ * symbol, followed by the offset between the symbol and the address.
+ *
+ * On success, if found, the out parameter `func_name` is set. The ownership
+ * of `func_name` is passed to the caller. On failure, `func_name` remains
+ * unchanged.
+ *
+ * @param so so_info instance for the executable containing
+ * the address
+ * @param addr Virtual memory address for which to find the
+ * function name
+ * @param func_name Out parameter, the function name.
+ * @returns 0 on success, -1 on failure
+ */
+BT_HIDDEN
+int so_info_lookup_function_name(struct so_info *so, uint64_t addr,
+ char **func_name);
+
+/**
+ * Get the source location (file name and line number) for a given
+ * address within an executable.
+ *
+ * If no DWARF info is available, the source location cannot be found
+ * and the function will return unsuccesfully.
+ *
+ * On success, if found, the out parameter `src_loc` is set. The ownership
+ * of `src_loc` is passed to the caller. On failure, `src_loc` remains
+ * unchanged.
+ *
+ * @param so so_info instance for the executable containing
+ * the address
+ * @param addr Virtual memory address for which to find the
+ * source location
+ * @param src_loc Out parameter, the source location
+ * @returns 0 on success, -1 on failure
+ */
+BT_HIDDEN
+int so_info_lookup_source_location(struct so_info *so, uint64_t addr,
+ struct source_location **src_loc);
+
+/**
+ * Destroy the given source_location instance
+ *
+ * @param src_loc source_location instance to destroy
+ */
+BT_HIDDEN
+void source_location_destroy(struct source_location *src_loc);
+
+#endif /* _BABELTRACE_SO_INFO_H */
projects / babeltrace.git / blobdiff