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1. define trampolines for both exceptions with error code (automatically
pushed to stack) and those without.
2. do not repeat vectors for unused IRQ numbers: we need 48, no need to
fill in 256.
3. also pass the pointer to trap frame (on the stack) to the handler
code
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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1. throw vectors in a custom ".reserved" section
2. throw idt in a NOLOAD ".reserved_0" section: save some binary size
(like .bss) since we don't care for its initial value.
3. squash all ".data.*" sections from rust into ".data"
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