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LibJIT: Integrate GDB JIT Interface with ELF builders

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Provide a function to create an ELF image in a format GDB expects.
Outside of ELF platforms this image doesn't make much sense, and in
MacOS a Mach-O memory image is required: see
https://chromium.googlesource.com/v8/v8.git/+/refs/heads/main/src/diagnostics/gdb-jit.cc#1802

Since GDB requires active runtime addresses for the code, copying the
generated code into the image will not help. Instead, `build_gdb_image`
writes the runtime addresses of the code into a NOBITS `.text` section.
This commit is contained in:
Jesús "gsus" Lapastora 2023-12-02 10:11:39 +01:00 • committed by Andrew Kaster
parent 48a9d0ede8
commit 149e382735
4 changed files with 122 additions and 0 deletions
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13
Userland/Libraries/LibJIT/GDB.h
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@ -6,10 +6,23 @@
#pragma once
#include <AK/FixedArray.h>
#include <AK/Span.h>
#include <AK/StringView.h>
namespace JIT::GDB {
void register_into_gdb(ReadonlyBytes data);
void unregister_from_gdb(ReadonlyBytes data);
// Build a GDB compatible image to register with the GDB JIT Interface.
// Returns Optional since the platform may not be supported.
// The `code` must be the region of memory that will be executed, since the
// image will hold direct references to addresses within the code. This way GDB
// will be able to identify the code region and insert breakpoints into it.
// Both `file_symbol_name` and `code_symbol_name` will end up in the symbol
// table of the image. They represent a file name for the image and a name for
// the region of code that is being executed.
Optional<FixedArray<u8>> build_gdb_image(ReadonlyBytes code, StringView file_symbol_name, StringView code_symbol_name);
}