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Use the entry point address from the ELF header instead of looking up _start.

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I love these kind of dumb gotcha moments. Turns out you can find the entry
address right there in the header. :^)
This commit is contained in:
Andreas Kling 2018-12-29 03:28:55 +01:00
parent ab72666f48
commit 46ce47a984
Notes: sideshowbarker 2024-07-19 16:06:52 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/46ce47a9846
3 changed files with 5 additions and 2 deletions
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2
Kernel/ELFImage.h
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@ -155,6 +155,8 @@ public:
bool is_executable() const { return header().e_type == ET_EXEC; }
bool is_relocatable() const { return header().e_type == ET_REL; }
LinearAddress entry() const { return LinearAddress(header().e_entry); }
private:
bool parseHeader();
const char* raw_data(unsigned offset) const;

1
Kernel/ELFLoader.h
View file

@ -17,6 +17,7 @@ public:
char* symbol_ptr(const char* name);
bool allocate_section(LinearAddress, size_t, size_t alignment, bool is_readable, bool is_writable);
bool map_section(LinearAddress, size_t, size_t alignment, size_t offset_in_image, bool is_readable, bool is_writable);
LinearAddress entry() const { return m_image.entry(); }
private:
bool layout();

4
Kernel/Process.cpp
View file

@ -344,7 +344,7 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
return -ENOEXEC;
}
entry_eip = (dword)loader.symbol_ptr("_start");
entry_eip = loader.entry().get();
if (!entry_eip) {
m_page_directory = old_page_directory;
MM.enter_process_paging_scope(*this);
@ -606,7 +606,7 @@ Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring
if (!fork_parent->m_fds[i].descriptor)
continue;
#ifdef FORK_DEBUG
dbgprintf("fork: cloning fd %u... (%p) istty? %u\n", i, fork_parent->m_fds[i].ptr(), fork_parent->m_fds[i]->isTTY());
dbgprintf("fork: cloning fd %u... (%p) istty? %u\n", i, fork_parent->m_fds[i].descriptor.ptr(), fork_parent->m_fds[i].descriptor->is_tty());
#endif
m_fds[i].descriptor = fork_parent->m_fds[i].descriptor->clone();
m_fds[i].flags = fork_parent->m_fds[i].flags;