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| shorne | ok, one more thing I thought of, we have another simulator or1ksim, I tried booting the faulty kernel on that, I cannot reproduce the issue there either | 03:19 |
|---|---|---|
| shorne | so more things pointing to qemu | 03:19 |
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| zx2c4 | shorne: i wonder if do_range() is doing something silly with the branch delay slot? | 10:38 |
| zx2c4 | Or openrisc_cpu_do_interrupt | 10:39 |
| shorne | zx2c4: yeah, it could be, I have been reading the code to try to remember it better | 10:47 |
| shorne | I bet it is something to do with the delay slot handling | 10:59 |
| zx2c4 | shorne: which would correspond with the branches in multdi3 | 10:59 |
| zx2c4 | Missing some subtle carry | 10:59 |
| zx2c4 | Making crypto selftests go wild | 10:59 |
| zx2c4 | Whereas most arithmetic doesnt really care about overflow bit | 10:59 |
| shorne | but it seems to be some combintation with the alignment too | 11:01 |
| shorne | there is also a condition where translation blocks are exited due to TOO_MANY instructions (DISAS_TOO_MANY), I am wondering if there is a problem when that falls on a delay slot boundary | 11:44 |
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| shorne | maybe not though because the disasemble context that tracks delay slot doesnt reset for new blocks | 11:56 |
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| shorne | well, it tries to remember the delayslot | 11:58 |
| zx2c4 | hmm | 12:07 |
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| shorne | one more clue, if we look at the disassembly of fe_mul_impl | 22:34 |
| shorne | https://gist.github.com/stffrdhrn/32792410a3df5d0f1534a1387765ff7c | 22:34 |
| shorne | It falls on a page boundary, and that is a delay slot | 22:35 |
| shorne | c01e3ffc:10 00 00 03 l.bf c01e4008 <fe_mul_impl+0x9ac> | 22:35 |
| shorne | as I understand, qemu splits basic blocks on page boundaries | 22:36 |
| zx2c4 | shorne: bingo! | 23:05 |
| zx2c4 | so maybe it's not considering the delay as part of the block | 23:05 |
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