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Implement #np for IDTs (windows nt 3.x)

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This commit is contained in:
Fabian 2022-09-07 18:50:08 +09:00
parent 2cbe54cf38
commit 4e9ceb0ec1
1 changed files with 33 additions and 26 deletions
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59
src/rust/cpu/cpu.rs
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@ -741,11 +741,6 @@ pub unsafe fn call_interrupt_vector(
let dpl = descriptor.dpl();
let gate_type = descriptor.gate_type();
if !descriptor.is_present() {
// present bit not set
panic!("Unimplemented: #NP handler");
}
if is_software_int && dpl < *cpl {
dbg_log!("#gp software interrupt ({:x}) and dpl < cpl", interrupt_nr);
dbg_trace();
@ -753,6 +748,37 @@ pub unsafe fn call_interrupt_vector(
return;
}
if gate_type != InterruptDescriptor::TRAP_GATE
&& gate_type != InterruptDescriptor::INTERRUPT_GATE
&& gate_type != InterruptDescriptor::TASK_GATE
{
// invalid gate_type
dbg_log!(
"gate type invalid. gate_type=0b{:b} raw={:b}",
gate_type,
descriptor.raw
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
if !descriptor.reserved_zeros_are_valid() {
dbg_log!(
"reserved 0s violated. gate_type=0b{:b} raw={:b}",
gate_type,
descriptor.raw
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
if !descriptor.is_present() {
// present bit not set
dbg_log!("#np int descriptor not present, int={}", interrupt_nr);
trigger_np(interrupt_nr << 3 | 2);
return;
}
if gate_type == InterruptDescriptor::TASK_GATE {
// task gate
dbg_log!(
@ -762,31 +788,12 @@ pub unsafe fn call_interrupt_vector(
dpl
);
dbg_trace();
dbg_assert!(descriptor.is_32(), "TODO: Check this (likely #GP)");
dbg_assert!(offset == 0, "TODO: Check this (likely #GP)");
do_task_switch(selector, error_code);
return;
}
let is_valid_type = gate_type == InterruptDescriptor::TRAP_GATE
|| gate_type == InterruptDescriptor::INTERRUPT_GATE;
if !is_valid_type || !descriptor.reserved_zeros_are_valid() {
// invalid gate_type
dbg_log!(
"gate type invalid or reserved 0s violated. gate_type=0b{:b} raw={:b}",
gate_type,
descriptor.raw
);
dbg_log!(
"addr={:x} offset={:x} selector={:x}",
descriptor_address,
offset,
selector
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
let cs_segment_descriptor = match return_on_pagefault!(lookup_segment_selector(
SegmentSelector::of_u16(selector as u16)
)) {