mirror of
https://github.com/varun-r-mallya/sysprof.git
synced 2025-12-31 20:36:25 +00:00
libsysprof-analyze: give shape to ELF loading APIs
We need to separate a number of concerns here, such as debug-dirs within the process namespace vs global debug-dirs (external symbols on a developer workstation vs IoT/Laptop/VM/alternate-device). That means we need to be able to resolve paths via the mount namespace of the process as it was seen in the capture file. Additionally, we need to follow .gnu_debuglink section headers so that we can associate the version with symbols with the ELF that is loaded from the processes SysprofAddressLayout.
This commit is contained in:
Christian Hergert
@ -30,6 +30,8 @@ libsysprof_analyze_private_sources = [
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'sysprof-address-layout.c',
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'sysprof-document-bitset-index.c',
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'sysprof-document-symbols.c',
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'sysprof-elf.c',
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'sysprof-elf-loader.c',
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'sysprof-mount.c',
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'sysprof-mount-device.c',
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'sysprof-mount-namespace.c',
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49
src/libsysprof-analyze/sysprof-elf-loader-private.h
Normal file
49
src/libsysprof-analyze/sysprof-elf-loader-private.h
Normal file
@ -0,0 +1,49 @@
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/*
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* sysprof-elf-loader-private.h
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*
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* Copyright 2023 Christian Hergert <chergert@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include <glib-object.h>
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#include "sysprof-elf-private.h"
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#include "sysprof-mount-namespace-private.h"
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G_BEGIN_DECLS
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#define SYSPROF_TYPE_ELF_LOADER (sysprof_elf_loader_get_type())
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G_DECLARE_FINAL_TYPE (SysprofElfLoader, sysprof_elf_loader, SYSPROF, ELF_LOADER, GObject)
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SysprofElfLoader *sysprof_elf_loader_new (void);
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const char * const *sysprof_elf_loader_get_debug_dirs (SysprofElfLoader *self);
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void sysprof_elf_loader_set_debug_dirs (SysprofElfLoader *self,
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const char * const *debug_dirs);
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const char * const *sysprof_elf_loader_get_external_debug_dirs (SysprofElfLoader *self);
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void sysprof_elf_loader_set_external_debug_dirs (SysprofElfLoader *self,
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const char * const *debug_dirs);
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SysprofElf *sysprof_elf_loader_load (SysprofElfLoader *self,
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SysprofMountNamespace *mount_namespace,
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const char *file,
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const char *build_id,
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GError **error);
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G_END_DECLS
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258
src/libsysprof-analyze/sysprof-elf-loader.c
Normal file
258
src/libsysprof-analyze/sysprof-elf-loader.c
Normal file
@ -0,0 +1,258 @@
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/* sysprof-elf-loader.c
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*
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* Copyright 2023 Christian Hergert <chergert@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include "config.h"
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#include "sysprof-elf-loader-private.h"
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#include "sysprof-strings-private.h"
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#define DEFAULT_DEBUG_DIRS SYSPROF_STRV_INIT("/usr/lib/debug")
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struct _SysprofElfLoader
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{
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GObject parent_instance;
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char **debug_dirs;
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char **external_debug_dirs;
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};
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enum {
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PROP_0,
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PROP_DEBUG_DIRS,
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PROP_EXTERNAL_DEBUG_DIRS,
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N_PROPS
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};
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G_DEFINE_FINAL_TYPE (SysprofElfLoader, sysprof_elf_loader, G_TYPE_OBJECT)
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static GParamSpec *properties [N_PROPS];
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static void
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sysprof_elf_loader_finalize (GObject *object)
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{
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SysprofElfLoader *self = (SysprofElfLoader *)object;
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g_clear_pointer (&self->debug_dirs, g_strfreev);
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g_clear_pointer (&self->external_debug_dirs, g_strfreev);
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G_OBJECT_CLASS (sysprof_elf_loader_parent_class)->finalize (object);
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}
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static void
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sysprof_elf_loader_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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SysprofElfLoader *self = SYSPROF_ELF_LOADER (object);
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switch (prop_id)
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{
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case PROP_DEBUG_DIRS:
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g_value_set_boxed (value, sysprof_elf_loader_get_debug_dirs (self));
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break;
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case PROP_EXTERNAL_DEBUG_DIRS:
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g_value_set_boxed (value, sysprof_elf_loader_get_external_debug_dirs (self));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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sysprof_elf_loader_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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SysprofElfLoader *self = SYSPROF_ELF_LOADER (object);
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switch (prop_id)
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{
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case PROP_DEBUG_DIRS:
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sysprof_elf_loader_set_debug_dirs (self, g_value_get_boxed (value));
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break;
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case PROP_EXTERNAL_DEBUG_DIRS:
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sysprof_elf_loader_set_external_debug_dirs (self, g_value_get_boxed (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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sysprof_elf_loader_class_init (SysprofElfLoaderClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = sysprof_elf_loader_finalize;
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object_class->get_property = sysprof_elf_loader_get_property;
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object_class->set_property = sysprof_elf_loader_set_property;
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properties [PROP_DEBUG_DIRS] =
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g_param_spec_boxed ("debug-dirs", NULL, NULL,
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G_TYPE_STRV,
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(G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
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properties [PROP_EXTERNAL_DEBUG_DIRS] =
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g_param_spec_boxed ("external-debug-dirs", NULL, NULL,
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G_TYPE_STRV,
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(G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
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g_object_class_install_properties (object_class, N_PROPS, properties);
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}
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static void
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sysprof_elf_loader_init (SysprofElfLoader *self)
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{
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self->debug_dirs = g_strdupv ((char **)DEFAULT_DEBUG_DIRS);
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}
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/**
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* sysprof_elf_loader_get_debug_dirs:
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* @self: a #SysprofElfLoader
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*
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* Gets the #SysprofElfLoader:debug-dirs property.
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*
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* See sysprof_elf_loader_set_debug_dirs() for information on how
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* these directories are used.
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*
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* Returns: (nullable): an array of debug directories, or %NULL
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*/
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const char * const *
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sysprof_elf_loader_get_debug_dirs (SysprofElfLoader *self)
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{
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g_return_val_if_fail (SYSPROF_IS_ELF_LOADER (self), NULL);
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return (const char * const *)self->debug_dirs;
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}
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/**
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* sysprof_elf_loader_set_debug_dirs:
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* @self: a #SysprofElfLoader
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* @debug_dirs: the new debug directories to use
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*
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* Sets the #SysprofElfLoader:debug-dirs prpoerty.
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*
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* If @debug_dirs is %NULL, the default debug directories will
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* be used.
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*
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* These directories will be used to resolve debug symbols within
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* the mount namespace of the process whose symbols are being
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* resolved.
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*
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* To set a global directory that may contain debug symbols, use
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* sysprof_elf_loader_set_external_debug_dirs() which can be searched
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* regardless of what mount namespace the resolving process was in.
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*/
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void
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sysprof_elf_loader_set_debug_dirs (SysprofElfLoader *self,
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const char * const *debug_dirs)
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{
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g_return_if_fail (SYSPROF_IS_ELF_LOADER (self));
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g_return_if_fail (self->debug_dirs != NULL);
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if (sysprof_set_strv (&self->debug_dirs, debug_dirs))
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g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_DEBUG_DIRS]);
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}
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/**
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* sysprof_elf_loader_get_external_debug_dirs:
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* @self: a #SysprofElfLoader
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*
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* Gets the #SysprofElfLoader:external-debug-dirs property.
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*
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* See sysprof_elf_loader_set_external_debug_dirs() for how this
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* property is used to locate ELF files.
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*
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* Returns: (nullable): an array of external debug directories, or %NULL
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*/
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const char * const *
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sysprof_elf_loader_get_external_debug_dirs (SysprofElfLoader *self)
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{
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g_return_val_if_fail (SYSPROF_IS_ELF_LOADER (self), NULL);
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return (const char * const *)self->external_debug_dirs;
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}
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/**
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* sysprof_elf_loader_set_external_debug_dirs:
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* @self: a #SysprofElfLoader
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* @external_debug_dirs: (nullable): array of debug directories to resolve
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* `.gnu_debuglink` references in ELF files.
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*
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* Sets the #SysprofElfLoader:external-debug-dirs property.
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*
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* This is used to resolve `.gnu_debuglink` files across any process that is
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* loading ELF files with this #SysprofElfLoader. That allows for symbolizing
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* a capture file that was recording on a different system for which the
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* debug symbols only exist locally.
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*
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* Note that this has no effect on stack trace unwinding, that must occur
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* independently of this, when the samples are recorded by the specific
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* unwinder in use.
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*/
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void
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sysprof_elf_loader_set_external_debug_dirs (SysprofElfLoader *self,
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const char * const *external_debug_dirs)
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{
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g_return_if_fail (SYSPROF_IS_ELF_LOADER (self));
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if (sysprof_set_strv (&self->external_debug_dirs, external_debug_dirs))
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g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_EXTERNAL_DEBUG_DIRS]);
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}
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/**
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* sysprof_elf_loader_load:
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* @self: a #SysprofElfLoader
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* @mount_namespace: a #SysprofMountNamespace for path resolving
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* @file: the path of the file to load within the mount namespace
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* @build_id: (nullable): an optional build-id that can be used to resolve
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* the file alternatively to the file path
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*
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* Attempts to load a #SysprofElf for @file (or optionally by @build_id).
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*
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* This attempts to follow `.gnu_debuglink` ELF section headers and attach
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* them to the resulting #SysprofElf so that additional symbol information
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* is available.
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*
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* Returns: (transfer full): a #SysprofElf, or %NULL if the file could
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* not be resolved.
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*/
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SysprofElf *
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sysprof_elf_loader_load (SysprofElfLoader *self,
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SysprofMountNamespace *mount_namespace,
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const char *file,
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const char *build_id,
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GError **error)
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{
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g_return_val_if_fail (SYSPROF_IS_ELF_LOADER (self), NULL);
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failure:
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g_set_error_literal (error,
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G_FILE_ERROR,
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G_FILE_ERROR_NOENT,
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"Failed to locate file");
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return NULL;
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}
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43
src/libsysprof-analyze/sysprof-elf-private.h
Normal file
43
src/libsysprof-analyze/sysprof-elf-private.h
Normal file
@ -0,0 +1,43 @@
|
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/* sysprof-elf-private.h
|
||||
*
|
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* Copyright 2023 Christian Hergert <chergert@redhat.com>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-3.0-or-later
|
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*/
|
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|
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#pragma once
|
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#include <glib-object.h>
|
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G_BEGIN_DECLS
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|
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#define SYSPROF_TYPE_ELF (sysprof_elf_get_type())
|
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G_DECLARE_FINAL_TYPE (SysprofElf, sysprof_elf, SYSPROF, ELF, GObject)
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|
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SysprofElf *sysprof_elf_new (const char *filename,
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GError **error);
|
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const char *sysprof_elf_get_build_id (SysprofElf *self);
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const char *sysprof_elf_get_debug_link (SysprofElf *self);
|
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const char *sysprof_elf_get_symbol_at_address (SysprofElf *self,
|
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guint64 address,
|
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guint64 *begin_address,
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guint64 *end_address);
|
||||
SysprofElf *sysprof_elf_get_debug_link_elf (SysprofElf *self);
|
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void sysprof_elf_set_debug_link_elf (SysprofElf *self,
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SysprofElf *debug_link_elf);
|
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|
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G_END_DECLS
|
||||
201
src/libsysprof-analyze/sysprof-elf.c
Normal file
201
src/libsysprof-analyze/sysprof-elf.c
Normal file
@ -0,0 +1,201 @@
|
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/* sysprof-elf.c
|
||||
*
|
||||
* Copyright 2023 Christian Hergert <chergert@redhat.com>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-3.0-or-later
|
||||
*/
|
||||
|
||||
#include "config.h"
|
||||
|
||||
#include "sysprof-elf-private.h"
|
||||
|
||||
struct _SysprofElf
|
||||
{
|
||||
GObject parent_instance;
|
||||
char *build_id;
|
||||
char *debug_link;
|
||||
SysprofElf *debug_link_elf;
|
||||
};
|
||||
|
||||
enum {
|
||||
PROP_0,
|
||||
PROP_BUILD_ID,
|
||||
PROP_DEBUG_LINK,
|
||||
PROP_DEBUG_LINK_ELF,
|
||||
N_PROPS
|
||||
};
|
||||
|
||||
G_DEFINE_FINAL_TYPE (SysprofElf, sysprof_elf, G_TYPE_OBJECT)
|
||||
|
||||
static GParamSpec *properties [N_PROPS];
|
||||
|
||||
static void
|
||||
sysprof_elf_finalize (GObject *object)
|
||||
{
|
||||
SysprofElf *self = (SysprofElf *)object;
|
||||
|
||||
g_clear_pointer (&self->build_id, g_free);
|
||||
g_clear_pointer (&self->debug_link, g_free);
|
||||
g_clear_object (&self->debug_link_elf);
|
||||
|
||||
G_OBJECT_CLASS (sysprof_elf_parent_class)->finalize (object);
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_elf_get_property (GObject *object,
|
||||
guint prop_id,
|
||||
GValue *value,
|
||||
GParamSpec *pspec)
|
||||
{
|
||||
SysprofElf *self = SYSPROF_ELF (object);
|
||||
|
||||
switch (prop_id)
|
||||
{
|
||||
case PROP_BUILD_ID:
|
||||
g_value_set_string (value, sysprof_elf_get_build_id (self));
|
||||
break;
|
||||
|
||||
case PROP_DEBUG_LINK:
|
||||
g_value_set_string (value, sysprof_elf_get_debug_link (self));
|
||||
break;
|
||||
|
||||
case PROP_DEBUG_LINK_ELF:
|
||||
g_value_set_object (value, sysprof_elf_get_debug_link_elf (self));
|
||||
break;
|
||||
|
||||
default:
|
||||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_elf_set_property (GObject *object,
|
||||
guint prop_id,
|
||||
const GValue *value,
|
||||
GParamSpec *pspec)
|
||||
{
|
||||
SysprofElf *self = SYSPROF_ELF (object);
|
||||
|
||||
switch (prop_id)
|
||||
{
|
||||
case PROP_DEBUG_LINK_ELF:
|
||||
sysprof_elf_set_debug_link_elf (self, g_value_get_object (value));
|
||||
break;
|
||||
|
||||
default:
|
||||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_elf_class_init (SysprofElfClass *klass)
|
||||
{
|
||||
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
||||
|
||||
object_class->finalize = sysprof_elf_finalize;
|
||||
object_class->get_property = sysprof_elf_get_property;
|
||||
object_class->set_property = sysprof_elf_set_property;
|
||||
|
||||
properties [PROP_BUILD_ID] =
|
||||
g_param_spec_string ("build-id", NULL, NULL,
|
||||
NULL,
|
||||
(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
|
||||
|
||||
properties [PROP_DEBUG_LINK] =
|
||||
g_param_spec_string ("debug-link", NULL, NULL,
|
||||
NULL,
|
||||
(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
|
||||
|
||||
properties [PROP_DEBUG_LINK_ELF] =
|
||||
g_param_spec_object ("debug-link-elf", NULL, NULL,
|
||||
SYSPROF_TYPE_ELF,
|
||||
(G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
|
||||
|
||||
g_object_class_install_properties (object_class, N_PROPS, properties);
|
||||
}
|
||||
|
||||
static void
|
||||
sysprof_elf_init (SysprofElf *self)
|
||||
{
|
||||
}
|
||||
|
||||
SysprofElf *
|
||||
sysprof_elf_new (const char *filename,
|
||||
GError **error)
|
||||
{
|
||||
g_return_val_if_fail (filename != NULL, NULL);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
const char *
|
||||
sysprof_elf_get_build_id (SysprofElf *self)
|
||||
{
|
||||
g_return_val_if_fail (SYSPROF_IS_ELF (self), NULL);
|
||||
|
||||
return self->build_id;
|
||||
}
|
||||
|
||||
const char *
|
||||
sysprof_elf_get_debug_link (SysprofElf *self)
|
||||
{
|
||||
g_return_val_if_fail (SYSPROF_IS_ELF (self), NULL);
|
||||
|
||||
return self->debug_link;
|
||||
}
|
||||
|
||||
const char *
|
||||
sysprof_elf_get_symbol_at_address (SysprofElf *self,
|
||||
guint64 address,
|
||||
guint64 *begin_address,
|
||||
guint64 *end_address)
|
||||
{
|
||||
g_return_val_if_fail (SYSPROF_IS_ELF (self), NULL);
|
||||
g_return_val_if_fail (begin_address != NULL, NULL);
|
||||
g_return_val_if_fail (end_address != NULL, NULL);
|
||||
|
||||
*begin_address = *end_address = 0;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* sysprof_elf_get_debug_link_elf:
|
||||
* @self: a #SysprofElf
|
||||
*
|
||||
* Gets a #SysprofElf that was resolved from the `.gnu_debuglink`
|
||||
* ELF section header.
|
||||
*
|
||||
* Returns: (transfer none) (nullable): a #SysprofElf or %NULL
|
||||
*/
|
||||
SysprofElf *
|
||||
sysprof_elf_get_debug_link_elf (SysprofElf *self)
|
||||
{
|
||||
g_return_val_if_fail (SYSPROF_IS_ELF (self), NULL);
|
||||
|
||||
return self->debug_link_elf;
|
||||
}
|
||||
|
||||
void
|
||||
sysprof_elf_set_debug_link_elf (SysprofElf *self,
|
||||
SysprofElf *debug_link_elf)
|
||||
{
|
||||
g_return_if_fail (SYSPROF_IS_ELF (self));
|
||||
g_return_if_fail (!debug_link_elf || SYSPROF_IS_ELF (debug_link_elf));
|
||||
|
||||
if (g_set_object (&self->debug_link_elf, debug_link_elf))
|
||||
g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_DEBUG_LINK_ELF]);
|
||||
}
|
||||
Reference in New Issue
Block a user