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Kernel/aarch64: Call handle_crash on unknown exceptions
This is useful for debugging, as it will now print out a userspace backtrace, and optionally also dump the memory regions of the process.
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parent
6b66e39df4
commit
5d587ea562
1 changed files with 11 additions and 6 deletions
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@ -53,7 +53,7 @@ void dump_registers(RegisterState const& regs)
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dbgln("x30={:p}", regs.x[30]);
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}
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static PageFault page_fault_from_exception_syndrome_register(VirtualAddress fault_address, Aarch64::ESR_EL1 esr_el1)
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static ErrorOr<PageFault> page_fault_from_exception_syndrome_register(VirtualAddress fault_address, Aarch64::ESR_EL1 esr_el1)
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{
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PageFault fault { fault_address };
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@ -63,7 +63,8 @@ static PageFault page_fault_from_exception_syndrome_register(VirtualAddress faul
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} else if (data_fault_status_code >= 0b000100 && data_fault_status_code <= 0b000111) {
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fault.set_type(PageFault::Type::PageNotPresent);
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} else {
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PANIC("Unknown DFSC: {}", data_fault_status_code);
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dbgln("Unknown DFSC: {}", Aarch64::data_fault_status_code_to_string(esr_el1.ISS));
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return Error::from_errno(EFAULT);
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}
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fault.set_access((esr_el1.ISS & (1 << 6)) == (1 << 6) ? PageFault::Access::Write : PageFault::Access::Read);
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@ -86,13 +87,17 @@ extern "C" void exception_common(Kernel::TrapFrame* trap_frame)
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Processor::enable_interrupts();
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if (Aarch64::exception_class_is_data_abort(esr_el1.EC) || Aarch64::exception_class_is_instruction_abort(esr_el1.EC)) {
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auto page_fault = page_fault_from_exception_syndrome_register(VirtualAddress(fault_address), esr_el1);
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page_fault.handle(*trap_frame->regs);
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auto page_fault_or_error = page_fault_from_exception_syndrome_register(VirtualAddress(fault_address), esr_el1);
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if (page_fault_or_error.is_error()) {
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handle_crash(*trap_frame->regs, "Unknown page fault", SIGSEGV, false);
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} else {
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auto page_fault = page_fault_or_error.release_value();
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page_fault.handle(*trap_frame->regs);
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}
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} else if (Aarch64::exception_class_is_svc_instruction_execution(esr_el1.EC)) {
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syscall_handler(trap_frame);
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} else {
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dump_registers(*trap_frame->regs);
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PANIC("Unexpected exception!");
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handle_crash(*trap_frame->regs, "Unexpected exception", SIGSEGV, false);
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}
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Processor::disable_interrupts();
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