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Kernel: Consolidate a bunch of i386/x86_64 code paths

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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).
This commit is contained in:
Andreas Kling 2021-08-19 21:53:53 +02:00
parent 3f5a42b3dd
commit 961f727448
6 changed files with 64 additions and 117 deletions
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57
Kernel/Thread.cpp
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@ -86,10 +86,10 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
reset_fpu_state();
#if ARCH(I386)
// Only IF is set when a process boots.
m_regs.eflags = 0x0202;
m_regs.set_flags(0x0202);
#if ARCH(I386)
if (m_process->is_kernel_process()) {
m_regs.cs = GDT_SELECTOR_CODE0;
m_regs.ds = GDT_SELECTOR_DATA0;
@ -106,9 +106,6 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
m_regs.gs = GDT_SELECTOR_TLS | 3;
}
#else
// Only IF is set when a process boots.
m_regs.rflags = 0x0202;
if (m_process->is_kernel_process())
m_regs.cs = GDT_SELECTOR_CODE0;
else
@ -121,20 +118,15 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> ker
m_kernel_stack_top = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & ~(FlatPtr)0x7u;
if (m_process->is_kernel_process()) {
#if ARCH(I386)
m_regs.esp = m_regs.esp0 = m_kernel_stack_top;
#else
m_regs.rsp = m_regs.rsp0 = m_kernel_stack_top;
#endif
m_regs.set_sp(m_kernel_stack_top);
m_regs.set_sp0(m_kernel_stack_top);
} else {
// Ring 3 processes get a separate stack for ring 0.
// The ring 3 stack will be assigned by exec().
#if ARCH(I386)
m_regs.ss0 = GDT_SELECTOR_DATA0;
m_regs.esp0 = m_kernel_stack_top;
#else
m_regs.rsp0 = m_kernel_stack_top;
#endif
m_regs.set_sp0(m_kernel_stack_top);
}
// We need to add another reference if we could successfully create
@ -938,21 +930,12 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
m_have_any_unmasked_pending_signals.store(m_pending_signals & ~m_signal_mask, AK::memory_order_release);
auto setup_stack = [&](RegisterState& state) {
#if ARCH(I386)
FlatPtr stack = state.userspace_esp;
FlatPtr old_esp = stack;
FlatPtr ret_eip = state.eip;
FlatPtr ret_eflags = state.eflags;
FlatPtr stack = state.userspace_sp();
FlatPtr old_sp = stack;
FlatPtr ret_ip = state.ip();
FlatPtr ret_flags = state.flags();
dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to EIP {:p}, ESP {:p}", ret_eip, old_esp);
#elif ARCH(X86_64)
FlatPtr stack = state.userspace_rsp;
FlatPtr old_rsp = stack;
FlatPtr ret_rip = state.rip;
FlatPtr ret_rflags = state.rflags;
dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to RIP {:p}, RSP {:p}", ret_rip, old_rsp);
#endif
dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to IP {:p}, SP {:p}", ret_ip, old_sp);
#if ARCH(I386)
// Align the stack to 16 bytes.
@ -963,14 +946,14 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
FlatPtr stack_alignment = (stack - 8) % 16;
stack -= stack_alignment;
push_value_on_user_stack(stack, ret_eflags);
push_value_on_user_stack(stack, ret_flags);
push_value_on_user_stack(stack, ret_eip);
push_value_on_user_stack(stack, ret_ip);
push_value_on_user_stack(stack, state.eax);
push_value_on_user_stack(stack, state.ecx);
push_value_on_user_stack(stack, state.edx);
push_value_on_user_stack(stack, state.ebx);
push_value_on_user_stack(stack, old_esp);
push_value_on_user_stack(stack, old_sp);
push_value_on_user_stack(stack, state.ebp);
push_value_on_user_stack(stack, state.esi);
push_value_on_user_stack(stack, state.edi);
@ -984,9 +967,9 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
FlatPtr stack_alignment = stack % 16;
stack -= 128 + stack_alignment;
push_value_on_user_stack(stack, ret_rflags);
push_value_on_user_stack(stack, ret_flags);
push_value_on_user_stack(stack, ret_rip);
push_value_on_user_stack(stack, ret_ip);
push_value_on_user_stack(stack, state.r15);
push_value_on_user_stack(stack, state.r14);
push_value_on_user_stack(stack, state.r13);
@ -999,7 +982,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
push_value_on_user_stack(stack, state.rcx);
push_value_on_user_stack(stack, state.rdx);
push_value_on_user_stack(stack, state.rbx);
push_value_on_user_stack(stack, old_rsp);
push_value_on_user_stack(stack, old_sp);
push_value_on_user_stack(stack, state.rbp);
push_value_on_user_stack(stack, state.rsi);
push_value_on_user_stack(stack, state.rdi);
@ -1014,11 +997,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
// We write back the adjusted stack value into the register state.
// We have to do this because we can't just pass around a reference to a packed field, as it's UB.
#if ARCH(I386)
state.userspace_esp = stack;
#else
state.userspace_rsp = stack;
#endif
state.set_userspace_sp(stack);
VERIFY((stack % 16) == 0);
};
@ -1030,7 +1009,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
auto& regs = get_register_dump_from_stack();
setup_stack(regs);
auto signal_trampoline_addr = process.signal_trampoline().get();
regs.set_ip_reg(signal_trampoline_addr);
regs.set_ip(signal_trampoline_addr);
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);