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Kernel: Separate out the symbol offsets in profile output

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Instead of saying "main +39" and "main +57" etc, we now have a separate
field in /proc/profile for the offset-into-the-symbol.
This commit is contained in:
Andreas Kling 2019-12-12 21:59:47 +01:00
parent 078ee798f7
commit 0f393148da
5 changed files with 19 additions and 8 deletions
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1
Kernel/FileSystem/ProcFS.cpp
View file

@ -372,6 +372,7 @@ Optional<KBuffer> procfs$profile(InodeIdentifier)
auto frame_object = frames_array.add_object();
frame_object.add("address", JsonValue((u32)sample.frames[i]));
frame_object.add("symbol", sample.symbolicated_frames[i]);
frame_object.add("offset", JsonValue((u32)sample.offsets[i]));
frame_object.finish();
}
frames_array.finish();

17
Kernel/Profiling.cpp
View file

@ -57,19 +57,24 @@ static void symbolicate(Sample& stack)
for (auto& symbol : recognized_symbols) {
if (!symbol.address)
break;
auto& symbol_string_slot = stack.symbolicated_frames[i++];
auto& symbol_string_slot = stack.symbolicated_frames[i];
auto& offset_slot = stack.offsets[i];
++i;
if (!symbol.ksym) {
if (!Scheduler::is_active() && process.elf_loader() && process.elf_loader()->has_symbols())
symbol_string_slot = String::format("%s", process.elf_loader()->symbolicate(symbol.address).characters());
symbol_string_slot = process.elf_loader()->symbolicate(symbol.address, &offset_slot);
else
symbol_string_slot = String::empty();
continue;
}
unsigned offset = symbol.address - symbol.ksym->address;
if (symbol.ksym->address == ksym_highest_address && offset > 4096)
u32 offset = symbol.address - symbol.ksym->address;
if (symbol.ksym->address == ksym_highest_address && offset > 4096) {
symbol_string_slot = String::empty();
else
symbol_string_slot = String::format("%s +%u", demangle(symbol.ksym->name).characters(), offset);
offset_slot = 0;
} else {
symbol_string_slot = demangle(symbol.ksym->name);
offset_slot = offset;
}
}
}

1
Kernel/Profiling.h
View file

@ -15,6 +15,7 @@ struct Sample {
i32 tid;
u64 timestamp;
u32 frames[max_stack_frame_count];
u32 offsets[max_stack_frame_count];
String symbolicated_frames[max_stack_frame_count];
};

6
Libraries/LibELF/ELFLoader.cpp
View file

@ -102,7 +102,7 @@ char* ELFLoader::symbol_ptr(const char* name)
return found_ptr;
}
String ELFLoader::symbolicate(u32 address) const
String ELFLoader::symbolicate(u32 address, u32* out_offset) const
{
SortedSymbol* sorted_symbols = nullptr;
#ifdef KERNEL
@ -139,6 +139,10 @@ String ELFLoader::symbolicate(u32 address) const
if (i == 0)
return "!!";
auto& symbol = sorted_symbols[i - 1];
if (out_offset) {
*out_offset = address - symbol.address;
return demangle(symbol.name);
}
return String::format("%s +%u", demangle(symbol.name).characters(), address - symbol.address);
}
}

2
Libraries/LibELF/ELFLoader.h
View file

@ -27,7 +27,7 @@ public:
bool has_symbols() const { return m_image.symbol_count(); }
String symbolicate(u32 address) const;
String symbolicate(u32 address, u32* offset = nullptr) const;
private:
bool layout();