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https://github.com/RGBCube/serenity
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Kernel: Consolidate a bunch of i386/x86_64 code paths
Add some arch-specific getters and setters that allow us to merge blocks that were previously specific to either ARCH(I386) or ARCH(X86_64).
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parent
3f5a42b3dd
commit
961f727448
6 changed files with 64 additions and 117 deletions
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@ -86,10 +86,10 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
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reset_fpu_state();
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#if ARCH(I386)
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// Only IF is set when a process boots.
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m_regs.eflags = 0x0202;
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m_regs.set_flags(0x0202);
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#if ARCH(I386)
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if (m_process->is_kernel_process()) {
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m_regs.cs = GDT_SELECTOR_CODE0;
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m_regs.ds = GDT_SELECTOR_DATA0;
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@ -106,9 +106,6 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
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m_regs.gs = GDT_SELECTOR_TLS | 3;
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}
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#else
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// Only IF is set when a process boots.
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m_regs.rflags = 0x0202;
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if (m_process->is_kernel_process())
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m_regs.cs = GDT_SELECTOR_CODE0;
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else
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@ -121,20 +118,15 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
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m_kernel_stack_top = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & ~(FlatPtr)0x7u;
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if (m_process->is_kernel_process()) {
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#if ARCH(I386)
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m_regs.esp = m_regs.esp0 = m_kernel_stack_top;
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#else
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m_regs.rsp = m_regs.rsp0 = m_kernel_stack_top;
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#endif
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m_regs.set_sp(m_kernel_stack_top);
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m_regs.set_sp0(m_kernel_stack_top);
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} else {
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// Ring 3 processes get a separate stack for ring 0.
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// The ring 3 stack will be assigned by exec().
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#if ARCH(I386)
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m_regs.ss0 = GDT_SELECTOR_DATA0;
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m_regs.esp0 = m_kernel_stack_top;
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#else
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m_regs.rsp0 = m_kernel_stack_top;
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#endif
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m_regs.set_sp0(m_kernel_stack_top);
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}
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// We need to add another reference if we could successfully create
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@ -938,21 +930,12 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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m_have_any_unmasked_pending_signals.store(m_pending_signals & ~m_signal_mask, AK::memory_order_release);
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auto setup_stack = [&](RegisterState& state) {
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#if ARCH(I386)
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FlatPtr stack = state.userspace_esp;
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FlatPtr old_esp = stack;
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FlatPtr ret_eip = state.eip;
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FlatPtr ret_eflags = state.eflags;
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FlatPtr stack = state.userspace_sp();
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FlatPtr old_sp = stack;
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FlatPtr ret_ip = state.ip();
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FlatPtr ret_flags = state.flags();
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dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to EIP {:p}, ESP {:p}", ret_eip, old_esp);
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#elif ARCH(X86_64)
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FlatPtr stack = state.userspace_rsp;
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FlatPtr old_rsp = stack;
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FlatPtr ret_rip = state.rip;
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FlatPtr ret_rflags = state.rflags;
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dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to RIP {:p}, RSP {:p}", ret_rip, old_rsp);
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#endif
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dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to IP {:p}, SP {:p}", ret_ip, old_sp);
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#if ARCH(I386)
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// Align the stack to 16 bytes.
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@ -963,14 +946,14 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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FlatPtr stack_alignment = (stack - 8) % 16;
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stack -= stack_alignment;
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push_value_on_user_stack(stack, ret_eflags);
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push_value_on_user_stack(stack, ret_flags);
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push_value_on_user_stack(stack, ret_eip);
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push_value_on_user_stack(stack, ret_ip);
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push_value_on_user_stack(stack, state.eax);
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push_value_on_user_stack(stack, state.ecx);
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push_value_on_user_stack(stack, state.edx);
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push_value_on_user_stack(stack, state.ebx);
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push_value_on_user_stack(stack, old_esp);
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push_value_on_user_stack(stack, old_sp);
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push_value_on_user_stack(stack, state.ebp);
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push_value_on_user_stack(stack, state.esi);
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push_value_on_user_stack(stack, state.edi);
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@ -984,9 +967,9 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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FlatPtr stack_alignment = stack % 16;
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stack -= 128 + stack_alignment;
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push_value_on_user_stack(stack, ret_rflags);
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push_value_on_user_stack(stack, ret_flags);
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push_value_on_user_stack(stack, ret_rip);
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push_value_on_user_stack(stack, ret_ip);
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push_value_on_user_stack(stack, state.r15);
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push_value_on_user_stack(stack, state.r14);
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push_value_on_user_stack(stack, state.r13);
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@ -999,7 +982,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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push_value_on_user_stack(stack, state.rcx);
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push_value_on_user_stack(stack, state.rdx);
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push_value_on_user_stack(stack, state.rbx);
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push_value_on_user_stack(stack, old_rsp);
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push_value_on_user_stack(stack, old_sp);
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push_value_on_user_stack(stack, state.rbp);
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push_value_on_user_stack(stack, state.rsi);
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push_value_on_user_stack(stack, state.rdi);
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@ -1014,11 +997,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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// We write back the adjusted stack value into the register state.
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// We have to do this because we can't just pass around a reference to a packed field, as it's UB.
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#if ARCH(I386)
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state.userspace_esp = stack;
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#else
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state.userspace_rsp = stack;
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#endif
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state.set_userspace_sp(stack);
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VERIFY((stack % 16) == 0);
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};
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@ -1030,7 +1009,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
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auto& regs = get_register_dump_from_stack();
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setup_stack(regs);
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auto signal_trampoline_addr = process.signal_trampoline().get();
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regs.set_ip_reg(signal_trampoline_addr);
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regs.set_ip(signal_trampoline_addr);
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dbgln_if(SIGNAL_DEBUG, "Thread in state '{}' has been primed with signal handler {:#04x}:{:p} to deliver {}", state_string(), m_regs.cs, m_regs.ip(), signal);
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