[arch][m68k] Add support for plain 68000 exception handling#499
[arch][m68k] Add support for plain 68000 exception handling#499travisg merged 2 commits intolittlekernel:masterfrom
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Generates per-vector stubs, with each vectory entry pointing to a unique stub slot, which branches to a common handler. We construct a synthetic exception frame that can be passed to the existing C handlers.
travisg
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I think there are a few issues here but otherwise LGTM.
- Set up vector 61 (unimplemented integer instruction) only on >= 020, since 060 ISP code does not support lower than 020. The ISP code is already linked in at build time when targeting 020 or higher. - Don't implement vector 61 ISP handler on plain 68000. 68060 can be supported by building for >= 020 or 060 explicitly.
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Sorry for taking a while, but this looks goot to me. I tried to test it on qemu virt machine but it blows up but I figured out that the problem is it tries to copy the vector table over the top of the code itself which is loaded at 0x0. I'll look into moving the load address to a higher spot, either by linking it differently and hoping -kernel honors that, or having it relocate itself to the final location in the top of start.S so that the vector table is free to be at 0. Sadly due to the way the first two vectors work on 68k you can't technically use them for a branch instruction to the real code (though in practice you really could for the qemu virt machine). Anyway, taking this as-is. Thanks! |
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Generates per-vector stubs, with each vectory entry pointing to a unique stub slot, which branches to a common handler.
We construct a synthetic exception frame that can be passed to the existing C handlers.