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