Alek Ratzloff
bff9220fb1
Some things that were previously hard VM-level errors are now handled by interrupts. While this is relatively easy to handle, I was wanting a little more structure for the error types - so, errors that should invoke an interrupt are passed along in their own structure in a VmError::Interrupt variant. If an error is raised during the tick() phase of execution that would cause an interrupt, that interrupt is intercepted and the VM continues. The State::interrupt() function also will catch double faults and triple faults, with a triple fault being its own variant in the VmError structure (so it cannot be intercepted as an interrupt by accident). Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
76 lines
1.5 KiB
NASM
76 lines
1.5 KiB
NASM
.section code 0x1000 {
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main:
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; Test that interrupts will not called when enabled flag is not set
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; (using 0x80 because anything below it is an error interrupt, and
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; invoking an error interrupt when disabled will cascade to a triple
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; fault)
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mov %status, 1
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int 0x80, 0
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cmpeq (count), 0
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jz end
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or %flags, 0b100
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; Test divide by zero interrupts
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; div
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add %status, 1
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mov %r0, 1
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div %r0, 0
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cmpeq (count), 1
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jz end
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; idiv
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add %status, 1
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idiv %r0, 0
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cmpeq (count), 2
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jz end
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; Test illegal memory address interrupts
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add %status, 1
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; TODO - fix this bug, this line breaks because it's trying to
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; calculate an address that's too large without using wrapping addition
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; functions
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;mov %status, (0xfffffffffffffff)
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mov %status, (0xffffffff)
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cmpeq (count), 3
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jz end
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mov %status, 0
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end:
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halt
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.align u64
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generic_handler:
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add (count), 1
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iret
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.export main
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.export generic_handler
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}
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.section ivt 0x1800 {
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ivt:
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.interrupt 0, 0
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.interrupt 0, 0
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.interrupt 1, generic_handler
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.interrupt 1, generic_handler
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.export ivt
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}
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.section shared 0x2000 {
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count: .u64 0
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.export count
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}
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.section stack 0x4000 .. 0x5000 {
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stack_base:
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.export stack_base
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}
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.meta {
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ip: main
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sp: stack_base
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ivt: ivt
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}
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