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Kernel: make load_elf() its own function

This commit is contained in:
Bananymous 2023-06-04 01:24:11 +03:00
parent 37b93da650
commit 51f4c0c750
2 changed files with 50 additions and 38 deletions
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4
kernel/include/kernel/Process.h
View File

@ -14,6 +14,8 @@
#include <sys/stat.h>
namespace LibELF { class ELF; }
namespace Kernel
{
@ -86,7 +88,7 @@ namespace Kernel
static Process* create_process();
static void register_process(Process*);
BAN::ErrorOr<void> cleanup_and_load_elf(BAN::StringView);
void load_elf(LibELF::ELF&);
BAN::ErrorOr<BAN::String> absolute_path_of(BAN::StringView) const;

84
kernel/kernel/Process.cpp
View File

@ -46,15 +46,19 @@ namespace Kernel
BAN::ErrorOr<Process*> Process::create_userspace(BAN::StringView path)
{
auto* elf = TRY(LibELF::ELF::load_from_file(path));
if (!elf->is_native())
{
derrorln("ELF has invalid architecture");
delete elf;
return BAN::Error::from_errno(EINVAL);
}
auto* process = create_process();
MUST(process->m_working_directory.push_back('/'));
process->m_page_table = MUST(PageTable::create_userspace());
if (auto res = process->cleanup_and_load_elf(path); res.is_error())
{
delete process;
return res.error();
}
process->load_elf(*elf);
char** argv = nullptr;
{
@ -68,6 +72,9 @@ namespace Kernel
process->m_userspace_entry.argc = 1;
process->m_userspace_entry.argv = argv;
process->m_userspace_entry.entry = elf->file_header_native().e_entry;
delete elf;
auto* thread = MUST(Thread::create_userspace(process));
process->add_thread(thread);
@ -198,9 +205,30 @@ namespace Kernel
if (str_envp.emplace_back(*envp++).is_error())
return BAN::Error::from_errno(ENOMEM);
auto* elf = TRY(LibELF::ELF::load_from_file(path));
if (!elf->is_native())
{
derrorln("ELF has invalid architecture");
delete elf;
return BAN::Error::from_errno(EINVAL);
}
LockGuard lock_guard(m_lock);
MUST(cleanup_and_load_elf(path));
m_fixed_width_allocators.clear();
m_general_allocator.clear();
for (auto* range : m_mapped_ranges)
delete range;
m_mapped_ranges.clear();
m_open_files.clear();
load_elf(*elf);
m_userspace_entry.entry = elf->file_header_native().e_entry;
delete elf;
ASSERT(m_threads.size() == 1);
ASSERT(&Process::current() == this);
@ -231,33 +259,14 @@ namespace Kernel
}
BAN::ErrorOr<void> Process::cleanup_and_load_elf(BAN::StringView path)
void Process::load_elf(LibELF::ELF& elf)
{
auto* elf = TRY(LibELF::ELF::load_from_file(path));
if (!elf->is_native())
{
derrorln("ELF has invalid architecture");
return BAN::Error::from_errno(EINVAL);
}
ASSERT(elf.is_native());
for (auto* allocator : m_fixed_width_allocators)
delete allocator;
m_fixed_width_allocators.clear();
if (m_general_allocator)
delete m_general_allocator;
m_general_allocator = nullptr;
for (auto* range : m_mapped_ranges)
delete range;
m_mapped_ranges.clear();
m_open_files.clear();
auto& elf_file_header = elf->file_header_native();
auto& elf_file_header = elf.file_header_native();
for (size_t i = 0; i < elf_file_header.e_phnum; i++)
{
auto& elf_program_header = elf->program_header_native(i);
auto& elf_program_header = elf.program_header_native(i);
switch (elf_program_header.p_type)
{
@ -265,7 +274,14 @@ namespace Kernel
break;
case LibELF::PT_LOAD:
{
ASSERT(page_table().is_range_free(elf_program_header.p_vaddr, elf_program_header.p_memsz));
if (!page_table().is_range_free(elf_program_header.p_vaddr, elf_program_header.p_memsz))
{
page_table().debug_dump();
Kernel::panic("vaddr {8H}-{8H} not free",
elf_program_header.p_vaddr,
elf_program_header.p_vaddr + elf_program_header.p_memsz
);
}
uint8_t flags = PageTable::Flags::UserSupervisor | PageTable::Flags::Present;
if (elf_program_header.p_flags & LibELF::PF_W)
flags |= PageTable::Flags::ReadWrite;
@ -277,7 +293,7 @@ namespace Kernel
{
PageTableScope _(page_table());
memcpy((void*)elf_program_header.p_vaddr, elf->data() + elf_program_header.p_offset, elf_program_header.p_filesz);
memcpy((void*)elf_program_header.p_vaddr, elf.data() + elf_program_header.p_offset, elf_program_header.p_filesz);
memset((void*)(elf_program_header.p_vaddr + elf_program_header.p_filesz), 0, elf_program_header.p_memsz - elf_program_header.p_filesz);
}
break;
@ -286,12 +302,6 @@ namespace Kernel
ASSERT_NOT_REACHED();
}
}
m_userspace_entry.entry = elf_file_header.e_entry;
delete elf;
return {};
}
BAN::ErrorOr<int> Process::open(BAN::StringView path, int flags)