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| shorne | zx2c4: yes, it may be, I think I now have enough details to be able to debug qemu for figuring this out | 09:52 |
|---|---|---|
| shorne | the other good tool to have is -dfilter | 09:52 |
| shorne | with qemu we can ask it to only trace certain instruction ranges | 09:53 |
| shorne | also I spent some time to refresh myself with the qemu tcg translator and openrisc implementation a bit | 09:53 |
| shorne | I always bounce between kernel, qemu, toolchain | 09:54 |
| shorne | so I don't remember things very well | 09:54 |
| shorne | -dfilter 0xc01e365c..0xc01e5430 | 09:56 |
| zx2c4 | shorne: i too context switch between a buncha stuff and page things out pretty quick | 09:58 |
| zx2c4 | i was reading this last night | 09:59 |
| zx2c4 | there's all the branch_delay = 2 stuff | 09:59 |
| zx2c4 | in the disassembler | 09:59 |
| zx2c4 | wonder if a place got missed or | 09:59 |
| zx2c4 | if it didnt propagate to how much to read at once or what | 09:59 |
| shorne | I think I found it | 10:45 |
| shorne | Usually when we see an instruction start in a delay slot it will be marked like this | 10:46 |
| shorne | ---- c01e4000 00000001 | 10:46 |
| shorne | 1 being the delay slot flag, so it works for this word boundary instruct | 10:46 |
| shorne | but, if this happens after an exception (i.e. timer) I see | 10:46 |
| shorne | ---- c01e4000 00000000 | 10:47 |
| shorne | and the jump processing is dropped | 10:47 |
| shorne | I think the exception is clearing the delay slot state | 10:47 |
| shorne | we can see it happens after | 10:48 |
| shorne | Stopped execution of TB chain before 0x7f7b047f3d40 [c01e4000] fe_mul_impl | 10:48 |
| shorne | anyway... need to do some errands then I can get some time to try to fix this code | 10:48 |
| shorne | the branch_delay = 2, is 2 for | 10:49 |
| shorne | 1. for current instruction | 10:49 |
| shorne | 1. for next instruction (which will get turned into the jump) | 10:49 |
| shorne | this is from -d op_out,in_asm,exec,nochain | 10:50 |
| shorne | So if we get an exception in a delay slot, on return openrisc should go to PC-4 (i.e. the jump instruction) | 11:29 |
| shorne | in this case its returning to the delay slot | 11:30 |
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