mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-11 19:07:15 +03:00
2a78bf8596
The Process::Handler type has KResultOr<FlatPtr> as its return type. Using a different return type with an equally-sized template parameter sort of works but breaks once that condition is no longer true, e.g. for KResultOr<int> on x86_64. Ideally the syscall handlers would also take FlatPtrs as their args so we can get rid of the reinterpret_cast for the function pointer but I didn't quite feel like cleaning that up as well.
37 lines
1.0 KiB
C++
37 lines
1.0 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Panic.h>
|
|
#include <Kernel/Process.h>
|
|
#include <Kernel/VM/Region.h>
|
|
|
|
namespace Kernel {
|
|
|
|
KResultOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
|
|
{
|
|
auto& regs = Thread::current()->get_register_dump_from_stack();
|
|
FlatPtr stack_pointer;
|
|
#if ARCH(I386)
|
|
stack_pointer = regs.userspace_esp;
|
|
#else
|
|
stack_pointer = regs.userspace_rsp;
|
|
#endif
|
|
auto* stack_region = space().find_region_containing(Range { VirtualAddress(stack_pointer), 1 });
|
|
|
|
// The syscall handler should have killed us if we had an invalid stack pointer.
|
|
VERIFY(stack_region);
|
|
|
|
FlatPtr stack_base = stack_region->range().base().get();
|
|
size_t stack_size = stack_region->size();
|
|
if (!copy_to_user(user_stack_base, &stack_base))
|
|
return EFAULT;
|
|
if (!copy_to_user(user_stack_size, &stack_size))
|
|
return EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
}
|