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Userland: Use /proc/kernel_base to determine the kernel base address

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This removes all the hard-coded kernel base addresses from userspace
tools.

One downside for this is that e.g. Profiler no longer uses a different
color for kernel symbols when run as a non-root user.
This commit is contained in:
Gunnar Beutner 2021-07-22 18:41:52 +02:00 • committed by Andreas Kling
parent 6115258a5c
commit 60d6137e73
9 changed files with 63 additions and 48 deletions
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2
Userland/DevTools/Profiler/CMakeLists.txt
View file

@ -19,4 +19,4 @@ set(SOURCES
)
serenity_app(Profiler ICON app-profiler)
target_link_libraries(Profiler LibGUI LibDesktop LibX86)
target_link_libraries(Profiler LibGUI LibDesktop LibX86 LibSymbolication)

10
Userland/DevTools/Profiler/DisassemblyModel.cpp
View file

@ -9,6 +9,7 @@
#include <AK/MappedFile.h>
#include <LibELF/Image.h>
#include <LibGUI/Painter.h>
#include <LibSymbolication/Symbolication.h>
#include <LibX86/Disassembler.h>
#include <LibX86/ELFSymbolProvider.h>
#include <ctype.h>
@ -40,13 +41,8 @@ DisassemblyModel::DisassemblyModel(Profile& profile, ProfileNode& node)
OwnPtr<ELF::Image> kernel_elf;
const ELF::Image* elf;
FlatPtr base_address = 0;
// FIXME: Use /proc for this
#if ARCH(I386)
FlatPtr kernel_base = 0xc0000000;
#else
FlatPtr kernel_base = 0x2000000000;
#endif
if (m_node.address() >= kernel_base) {
auto maybe_kernel_base = Symbolication::kernel_base();
if (maybe_kernel_base.has_value() && m_node.address() >= maybe_kernel_base.value()) {
if (!m_kernel_file) {
auto file_or_error = MappedFile::map("/boot/Kernel.debug");
if (file_or_error.is_error())

12
Userland/DevTools/Profiler/Profile.cpp
View file

@ -16,6 +16,7 @@
#include <AK/RefPtr.h>
#include <LibCore/File.h>
#include <LibELF/Image.h>
#include <LibSymbolication/Symbolication.h>
#include <sys/stat.h>
namespace Profiler {
@ -301,12 +302,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
continue;
}
// FIXME: Use /proc for this
#if ARCH(I386)
FlatPtr kernel_base = 0xc0000000;
#else
FlatPtr kernel_base = 0x2000000000;
#endif
auto maybe_kernel_base = Symbolication::kernel_base();
auto* stack = perf_event.get_ptr("stack");
VERIFY(stack);
@ -318,7 +314,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
FlyString object_name;
String symbol;
if (ptr >= kernel_base) {
if (maybe_kernel_base.has_value() && ptr >= maybe_kernel_base.value()) {
if (kernel_elf) {
symbol = kernel_elf->symbolicate(ptr, &offset);
} else {
@ -345,7 +341,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
continue;
FlatPtr innermost_frame_address = event.frames.at(1).address;
event.in_kernel = innermost_frame_address >= kernel_base;
event.in_kernel = maybe_kernel_base.has_value() && innermost_frame_address >= maybe_kernel_base.value();
events.append(move(event));
}

10
Userland/DevTools/Profiler/ProfileModel.cpp
View file

@ -8,6 +8,7 @@
#include "Profile.h"
#include <AK/StringBuilder.h>
#include <LibGUI/FileIconProvider.h>
#include <LibSymbolication/Symbolication.h>
#include <ctype.h>
#include <stdio.h>
@ -105,13 +106,8 @@ GUI::Variant ProfileModel::data(const GUI::ModelIndex& index, GUI::ModelRole rol
if (node->is_root()) {
return GUI::FileIconProvider::icon_for_executable(node->process().executable);
}
// FIXME: Use /proc for this
#if ARCH(I386)
FlatPtr kernel_base = 0xc0000000;
#else
FlatPtr kernel_base = 0x2000000000;
#endif
if (node->address() >= kernel_base)
auto maybe_kernel_base = Symbolication::kernel_base();
if (maybe_kernel_base.has_value() && node->address() >= maybe_kernel_base.value())
return m_kernel_frame_icon;
return m_user_frame_icon;
}