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https://github.com/RGBCube/serenity
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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.
36 lines
1 KiB
C++
36 lines
1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Panic.h>
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#include <Kernel/Process.h>
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#include <Kernel/VM/Region.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
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{
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auto& regs = Thread::current()->get_register_dump_from_stack();
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FlatPtr stack_pointer;
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#if ARCH(I386)
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stack_pointer = regs.userspace_esp;
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#else
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stack_pointer = regs.userspace_rsp;
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#endif
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auto* stack_region = space().find_region_containing(Range { VirtualAddress(stack_pointer), 1 });
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// The syscall handler should have killed us if we had an invalid stack pointer.
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VERIFY(stack_region);
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FlatPtr stack_base = stack_region->range().base().get();
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size_t stack_size = stack_region->size();
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if (!copy_to_user(user_stack_base, &stack_base))
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return EFAULT;
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if (!copy_to_user(user_stack_size, &stack_size))
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return EFAULT;
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return 0;
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}
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}
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