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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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12
Userland/DevTools/Profiler/Profile.cpp
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@ -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));
}