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cpu: Minor refactor in call_interrupt_vector

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Amaan Cheval 2018-09-20 00:30:32 +05:30 committed by Fabian
parent 8ba3de34c1
commit ae70cb7e4f
2 changed files with 12 additions and 5 deletions
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1
src/browser/starter.js
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@ -257,6 +257,7 @@ function V86Starter(options)
"abs": Math.abs,
"do_task_switch": (selector, error_code) => cpu.do_task_switch(selector, error_code),
// XXX: Port to Rust
"get_tss_stack_addr": (dpl) => cpu.get_tss_stack_addr(dpl),
"switch_cs_real_mode": (selector) => cpu.switch_cs_real_mode(selector),
};

16
src/rust/cpu2/cpu.rs
View file

@ -438,14 +438,17 @@ pub unsafe fn call_interrupt_vector(
if !is_valid_type || !reserved_zeroes_are_valid {
// invalid gate_type
dbg_trace();
dbg_log!("invalid gate_type: 0b{:b}", gate_type);
dbg_log!(
"gate type invalid or reserved 0s violated. gate_type=0b{:b}",
gate_type
);
dbg_log!(
"addr={:x} offset={:x} selector={:x}",
descriptor_address,
offset,
selector
);
dbg_trace();
panic!("Unimplemented: #GP handler");
}
@ -524,14 +527,14 @@ pub unsafe fn call_interrupt_vector(
let error_code_space = if has_error_code == true { 1 } else { 0 };
let vm86_space = if (old_flags & FLAG_VM) == FLAG_VM {
1
4
}
else {
0
};
let bytes_per_arg = if is_16 { 2 } else { 4 };
let stack_space = bytes_per_arg * (5 + error_code_space + 4 * vm86_space);
let stack_space = bytes_per_arg * (5 + error_code_space + vm86_space);
let new_stack_pointer = ss_segment_descriptor.base() + if ss_segment_descriptor.is_32()
{
new_esp - stack_space
@ -545,6 +548,7 @@ pub unsafe fn call_interrupt_vector(
ss_segment_descriptor.base() + new_esp - 1
));
// no exceptions below
*cpl = cs_segment_descriptor.dpl();
cpl_changed();
@ -553,11 +557,13 @@ pub unsafe fn call_interrupt_vector(
*flags &= !FLAG_VM & !FLAG_RF;
if !switch_seg(SS, new_ss) {
// XXX
dbg_assert!(false);
} // XXX
}
set_stack_reg(new_esp);
// XXX: #SS if stack would cross stack limit
if old_flags & FLAG_VM != 0 {
if is_16 {
dbg_assert!(false);