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Kernel/aarch64: Set exception origin mode to SP_EL0 for userspace thread
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@ -24,11 +24,11 @@ struct ThreadRegisters {
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void set_sp(FlatPtr value) { sp_el0 = value; }
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void set_initial_state(bool, Memory::AddressSpace& space, FlatPtr kernel_stack_top)
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void set_initial_state(bool is_kernel_process, Memory::AddressSpace& space, FlatPtr kernel_stack_top)
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{
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set_sp(kernel_stack_top);
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ttbr0_el1 = space.page_directory().ttbr0();
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set_spsr_el1();
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set_spsr_el1(is_kernel_process);
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}
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void set_entry_function(FlatPtr entry_ip, FlatPtr entry_data)
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@ -45,7 +45,7 @@ struct ThreadRegisters {
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TODO_AARCH64();
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}
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void set_spsr_el1()
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void set_spsr_el1(bool is_kernel_process)
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{
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Aarch64::SPSR_EL1 saved_program_status_register_el1 = {};
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@ -55,9 +55,7 @@ struct ThreadRegisters {
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saved_program_status_register_el1.I = 0;
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saved_program_status_register_el1.F = 0;
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// Set exception origin mode to EL1h, so when the context is restored, we'll be executing in EL1 with SP_EL1
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// FIXME: This must be EL0t when aarch64 supports userspace applications.
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saved_program_status_register_el1.M = Aarch64::SPSR_EL1::Mode::EL1h;
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saved_program_status_register_el1.M = is_kernel_process ? Aarch64::SPSR_EL1::Mode::EL1h : Aarch64::SPSR_EL1::Mode::EL0t;
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memcpy(&spsr_el1, &saved_program_status_register_el1, sizeof(u64));
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}
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};
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