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Kernel: Add sys$get_stack_bounds() for finding the stack base & size

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This will be useful when implementing conservative garbage collection.
This commit is contained in:
Andreas Kling
2020-03-16 19:06:33 +01:00
parent 086f68e878
commit ad92a1e4bc
5 changed files with 33 additions and 1 deletions
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21
Kernel/Process.cpp
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@@ -4838,4 +4838,25 @@ OwnPtr<Process::ELFBundle> Process::elf_bundle() const
return bundle;
}
int Process::sys$get_stack_bounds(FlatPtr* user_stack_base, size_t* user_stack_size)
{
if (!validate_write_typed(user_stack_base))
return -EFAULT;
if (!validate_write_typed(user_stack_size))
return -EFAULT;
FlatPtr stack_pointer = Thread::current->get_register_dump_from_stack().userspace_esp;
auto* stack_region = MM.region_from_vaddr(*this, VirtualAddress(stack_pointer));
if (!stack_region) {
ASSERT_NOT_REACHED();
return -EINVAL;
}
FlatPtr stack_base = stack_region->range().base().get();
size_t stack_size = stack_region->size();
copy_to_user(user_stack_base, &stack_base);
copy_to_user(user_stack_size, &stack_size);
return 0;
}
}