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Kernel: Take some baby steps towards x86_64
Make more of the kernel compile in 64-bit mode, and make some things pointer-size-agnostic (by using FlatPtr.) There's a lot of work to do here before the kernel will even compile.
This commit is contained in:
Andreas Kling
parent
eb08a0edd5
commit
8f70528f30
12 changed files with 187 additions and 118 deletions
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@ -137,13 +137,13 @@ static bool validate_inode_mmap_prot(const Process& process, int prot, const Ino
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return true;
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}
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void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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FlatPtr Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_mmap_params params;
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if (!copy_from_user(¶ms, user_params))
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return (void*)-EFAULT;
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return -EFAULT;
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void* addr = (void*)params.addr;
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size_t size = params.size;
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@ -162,27 +162,27 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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}
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if (alignment & ~PAGE_MASK)
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return (void*)-EINVAL;
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return -EINVAL;
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if (page_round_up_would_wrap(size))
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return (void*)-EINVAL;
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return -EINVAL;
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if (!is_user_range(VirtualAddress(addr), page_round_up(size)))
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return (void*)-EFAULT;
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return -EFAULT;
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String name;
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if (params.name.characters) {
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if (params.name.length > PATH_MAX)
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return (void*)-ENAMETOOLONG;
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return -ENAMETOOLONG;
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name = copy_string_from_user(params.name);
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if (name.is_null())
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return (void*)-EFAULT;
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return -EFAULT;
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}
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if (size == 0)
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return (void*)-EINVAL;
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return -EINVAL;
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if ((FlatPtr)addr & ~PAGE_MASK)
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return (void*)-EINVAL;
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return -EINVAL;
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bool map_shared = flags & MAP_SHARED;
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bool map_anonymous = flags & MAP_ANONYMOUS;
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@ -193,19 +193,19 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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bool map_randomized = flags & MAP_RANDOMIZED;
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if (map_shared && map_private)
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return (void*)-EINVAL;
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return -EINVAL;
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if (!map_shared && !map_private)
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return (void*)-EINVAL;
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return -EINVAL;
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if (map_fixed && map_randomized)
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return (void*)-EINVAL;
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return -EINVAL;
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if (!validate_mmap_prot(prot, map_stack, map_anonymous))
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return (void*)-EINVAL;
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return -EINVAL;
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if (map_stack && (!map_private || !map_anonymous))
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return (void*)-EINVAL;
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return -EINVAL;
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Region* region = nullptr;
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Optional<Range> range;
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@ -223,44 +223,44 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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}
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if (!range.has_value())
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return (void*)-ENOMEM;
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return -ENOMEM;
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if (map_anonymous) {
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auto strategy = map_noreserve ? AllocationStrategy::None : AllocationStrategy::Reserve;
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auto region_or_error = space().allocate_region(range.value(), !name.is_null() ? name : "mmap", prot, strategy);
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if (region_or_error.is_error())
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return (void*)region_or_error.error().error();
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return region_or_error.error().error();
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region = region_or_error.value();
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} else {
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if (offset < 0)
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return (void*)-EINVAL;
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return -EINVAL;
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if (static_cast<size_t>(offset) & ~PAGE_MASK)
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return (void*)-EINVAL;
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return -EINVAL;
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auto description = file_description(fd);
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if (!description)
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return (void*)-EBADF;
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return -EBADF;
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if (description->is_directory())
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return (void*)-ENODEV;
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return -ENODEV;
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// Require read access even when read protection is not requested.
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if (!description->is_readable())
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return (void*)-EACCES;
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return -EACCES;
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if (map_shared) {
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if ((prot & PROT_WRITE) && !description->is_writable())
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return (void*)-EACCES;
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return -EACCES;
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}
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if (description->inode()) {
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if (!validate_inode_mmap_prot(*this, prot, *description->inode(), map_shared))
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return (void*)-EACCES;
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return -EACCES;
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}
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auto region_or_error = description->mmap(*this, range.value(), static_cast<size_t>(offset), prot, map_shared);
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if (region_or_error.is_error())
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return (void*)region_or_error.error().error();
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return region_or_error.error().error();
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region = region_or_error.value();
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}
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if (!region)
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return (void*)-ENOMEM;
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return -ENOMEM;
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region->set_mmap(true);
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if (map_shared)
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region->set_shared(true);
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@ -268,7 +268,7 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
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region->set_stack(true);
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if (!name.is_null())
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region->set_name(name);
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return region->vaddr().as_ptr();
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return region->vaddr().get();
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}
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static KResultOr<Range> expand_range_to_page_boundaries(FlatPtr address, size_t size)
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@ -494,26 +494,26 @@ int Process::sys$munmap(void* addr, size_t size)
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return -EINVAL;
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}
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void* Process::sys$mremap(Userspace<const Syscall::SC_mremap_params*> user_params)
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FlatPtr Process::sys$mremap(Userspace<const Syscall::SC_mremap_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_mremap_params params {};
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if (!copy_from_user(¶ms, user_params))
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return (void*)-EFAULT;
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return -EFAULT;
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auto range_or_error = expand_range_to_page_boundaries((FlatPtr)params.old_address, params.old_size);
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if (range_or_error.is_error())
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return (void*)range_or_error.error().error();
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return range_or_error.error().error();
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auto old_range = range_or_error.value();
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auto* old_region = space().find_region_from_range(old_range);
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if (!old_region)
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return (void*)-EINVAL;
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return -EINVAL;
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if (!old_region->is_mmap())
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return (void*)-EPERM;
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return -EPERM;
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if (old_region->vmobject().is_shared_inode() && params.flags & MAP_PRIVATE && !(params.flags & (MAP_ANONYMOUS | MAP_NORESERVE))) {
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auto range = old_region->range();
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@ -529,28 +529,28 @@ void* Process::sys$mremap(Userspace<const Syscall::SC_mremap_params*> user_param
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auto new_region_or_error = space().allocate_region_with_vmobject(range, new_vmobject, 0, old_name, old_prot, false);
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if (new_region_or_error.is_error())
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return (void*)new_region_or_error.error().error();
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return new_region_or_error.error().error();
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auto& new_region = *new_region_or_error.value();
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new_region.set_mmap(true);
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return new_region.vaddr().as_ptr();
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return new_region.vaddr().get();
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}
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dbgln("sys$mremap: Unimplemented remap request (flags={})", params.flags);
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return (void*)-ENOTIMPL;
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return -ENOTIMPL;
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}
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void* Process::sys$allocate_tls(size_t size)
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FlatPtr Process::sys$allocate_tls(size_t size)
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{
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REQUIRE_PROMISE(stdio);
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if (!size)
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return (void*)-EINVAL;
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return -EINVAL;
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if (!m_master_tls_region.is_null())
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return (void*)-EEXIST;
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return -EEXIST;
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if (thread_count() != 1)
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return (void*)-EFAULT;
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return -EFAULT;
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Thread* main_thread = nullptr;
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for_each_thread([&main_thread](auto& thread) {
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@ -561,11 +561,11 @@ void* Process::sys$allocate_tls(size_t size)
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auto range = space().allocate_range({}, size);
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if (!range.has_value())
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return (void*)-ENOMEM;
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return -ENOMEM;
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auto region_or_error = space().allocate_region(range.value(), String(), PROT_READ | PROT_WRITE);
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if (region_or_error.is_error())
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return (void*)region_or_error.error().error();
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return region_or_error.error().error();
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m_master_tls_region = region_or_error.value()->make_weak_ptr();
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m_master_tls_size = size;
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@ -573,13 +573,13 @@ void* Process::sys$allocate_tls(size_t size)
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auto tsr_result = main_thread->make_thread_specific_region({});
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if (tsr_result.is_error())
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return (void*)-EFAULT;
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return -EFAULT;
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auto& tls_descriptor = Processor::current().get_gdt_entry(GDT_SELECTOR_TLS);
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tls_descriptor.set_base(main_thread->thread_specific_data());
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tls_descriptor.set_limit(main_thread->thread_specific_region_size());
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return m_master_tls_region.unsafe_ptr()->vaddr().as_ptr();
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return m_master_tls_region.unsafe_ptr()->vaddr().get();
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}
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int Process::sys$msyscall(void* address)
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