mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-10 13:00:29 +03:00
3bbf4610d2
You can now #include <AK/Forward.h> to get most of the AK types as forward declarations. Header dependency explosion is one of the main contributors to compile times at the moment, so this is a step towards smaller include graphs.
117 lines
4.6 KiB
C++
117 lines
4.6 KiB
C++
/*
|
|
* Copyright (c) 2019-2020, Andrew Kaster <andrewdkaster@gmail.com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/OwnPtr.h>
|
|
#include <AK/RefCounted.h>
|
|
#include <AK/String.h>
|
|
#include <LibELF/ELFDynamicObject.h>
|
|
#include <LibELF/ELFImage.h>
|
|
#include <LibELF/exec_elf.h>
|
|
#include <sys/mman.h>
|
|
|
|
#define ALIGN_ROUND_UP(x, align) ((((size_t)(x)) + align - 1) & (~(align - 1)))
|
|
|
|
class ELFDynamicLoader : public RefCounted<ELFDynamicLoader> {
|
|
public:
|
|
static NonnullRefPtr<ELFDynamicLoader> construct(const char* filename, int fd, size_t file_size);
|
|
|
|
~ELFDynamicLoader();
|
|
|
|
bool is_valid() const { return m_valid; }
|
|
|
|
// Load a full ELF image from file into the current process and create an ELFDynamicObject
|
|
// from the SHT_DYNAMIC in the file.
|
|
bool load_from_image(unsigned flags);
|
|
|
|
// Stage 2 of loading: relocations and init functions
|
|
// Assumes that the program headers have been loaded and that m_dynamic_object is initialized
|
|
// Splitting loading like this allows us to use the same code to relocate a main executable as an elf binary
|
|
bool load_stage_2(unsigned flags);
|
|
|
|
// Intended for use by dlsym or other internal methods
|
|
void* symbol_for_name(const char*);
|
|
|
|
void dump();
|
|
|
|
// Will be called from _fixup_plt_entry, as part of the PLT trampoline
|
|
Elf32_Addr patch_plt_entry(u32 relocation_offset);
|
|
|
|
private:
|
|
class ProgramHeaderRegion {
|
|
public:
|
|
void set_program_header(const Elf32_Phdr& header) { m_program_header = header; }
|
|
|
|
// Information from ELF Program header
|
|
u32 type() const { return m_program_header.p_type; }
|
|
u32 flags() const { return m_program_header.p_flags; }
|
|
u32 offset() const { return m_program_header.p_offset; }
|
|
VirtualAddress desired_load_address() const { return VirtualAddress(m_program_header.p_vaddr); }
|
|
u32 size_in_memory() const { return m_program_header.p_memsz; }
|
|
u32 size_in_image() const { return m_program_header.p_filesz; }
|
|
u32 alignment() const { return m_program_header.p_align; }
|
|
u32 mmap_prot() const;
|
|
bool is_readable() const { return flags() & PF_R; }
|
|
bool is_writable() const { return flags() & PF_W; }
|
|
bool is_executable() const { return flags() & PF_X; }
|
|
bool is_tls_template() const { return type() == PT_TLS; }
|
|
bool is_load() const { return type() == PT_LOAD; }
|
|
bool is_dynamic() const { return type() == PT_DYNAMIC; }
|
|
|
|
u32 required_load_size() { return ALIGN_ROUND_UP(m_program_header.p_memsz, m_program_header.p_align); }
|
|
|
|
private:
|
|
Elf32_Phdr m_program_header; // Explictly a copy of the PHDR in the image
|
|
};
|
|
|
|
explicit ELFDynamicLoader(const char* filename, int fd, size_t file_size);
|
|
explicit ELFDynamicLoader(Elf32_Dyn* dynamic_location, Elf32_Addr load_address);
|
|
|
|
// Stage 1
|
|
void load_program_headers(const ELFImage& elf_image);
|
|
|
|
// Stage 2
|
|
void do_relocations();
|
|
void setup_plt_trampoline();
|
|
void call_object_init_functions();
|
|
|
|
String m_filename;
|
|
size_t m_file_size { 0 };
|
|
int m_image_fd { -1 };
|
|
void* m_file_mapping { nullptr };
|
|
bool m_valid { true };
|
|
|
|
OwnPtr<ELFDynamicObject> m_dynamic_object;
|
|
|
|
VirtualAddress m_text_segment_load_address;
|
|
size_t m_text_segment_size;
|
|
|
|
VirtualAddress m_tls_segment_address;
|
|
VirtualAddress m_dynamic_section_address;
|
|
};
|