07:11 <re_irc> <@luojia65:matrix.org> I have a Rust API design question. I have a piece of code that reads memory in virtual system from hypervisor, should this pointer read code marked as #[must_use]?

07:11 <re_irc> <@luojia65:matrix.org> https://psion.agg.io/_matrix/media/r0/download/matrix.org/DVuLyJOQnFRGmlKpBqdpJRGK/image.png

07:20 <re_irc> <@grantm11235:matrix.org> I don't think that `#[must_use]` is helpful in that case

07:22 <re_irc> <@grantm11235:matrix.org> `core::ptr::read` doesnt

22:38 <re_irc> <@ubik:matrix.org> What kind of mess-up can cause a HardFault?

22:45 <re_irc> <@matoushybl:matrix.org> Wrong memory.x

22:47 <re_irc> <@ubik:matrix.org> only that?

22:49 <re_irc> <@xiretza:xiretza.xyz> ubik:matrix.org: too many things to iterate, honestly

22:49 <re_irc> <@xiretza:xiretza.xyz> do you have a stack trace?

22:49 <re_irc> <@ubik:matrix.org> that's the problem

22:50 <re_irc> <@ubik:matrix.org> the debugger says it's s HardFault but there is no stack trace

22:50 <re_irc> <@xiretza:xiretza.xyz> yeah, not too surprising

22:50 <re_irc> <@ubik:matrix.org> https://psion.agg.io/_matrix/media/r0/download/matrix.org/QFHJIhZrvKPcLLTLDAHIJskT/image.png

22:51 <re_irc> <@xiretza:xiretza.xyz> this happens immediately on reset?

22:51 <re_irc> <@ubik:matrix.org> basically

22:51 <re_irc> <@ubik:matrix.org> the debugger stops at the entry point

22:51 <re_irc> <@xiretza:xiretza.xyz> alright, one easy thing to do is to set a breakpoint on main and check if it gets there before faulting

22:51 <re_irc> <@ubik:matrix.org> but then even doing "step" results in that

22:52 <re_irc> <@xiretza:xiretza.xyz> oh, I see

22:53 <re_irc> <@ubik:matrix.org> very weird. it happens when I enable certain DMA transfers, but it seems to already fail at the very beginning of the program

22:53 <re_irc> <@xiretza:xiretza.xyz> ah, so you have at least a working hello world?

22:54 <re_irc> <@ubik:matrix.org> sure, the program works fine otherwise. it's just when I enable certain lines that this happens

22:55 <re_irc> <@xiretza:xiretza.xyz> hm, possibly a bad interrupt handler or something?

22:56 <re_irc> <@xiretza:xiretza.xyz> although I don't think anything other than the reset handler should fire until you explicity enable it

22:57 <re_irc> <@ubik:matrix.org> yeah, masking the corresponding interrupt doesn't improve the situation

22:57 <re_irc> <@ubik:matrix.org> it's super weird

22:59 <Lumpio-> So could you get it to stop on a breakpoint at the start of main or not?

23:03 <re_irc> <@ubik:matrix.org> https://psion.agg.io/_matrix/media/r0/download/matrix.org/vAEDxGwCOIOWTRIvzkvSIxBz/image.png

23:03 <re_irc> <@ubik:matrix.org> i believe I can:

23:14 <Lumpio-> I'm not sure how to read that color scheme - does that mean the debugger actually stopped there?

23:14 <Lumpio-> Does it crash immediately when you "step" then?

23:32 <re_irc> <@ubik:matrix.org> it still allows a few lines to go OK, but then it explodes way before anything relevant is done

23:58 <Lumpio-> Can you see the PC and stack pointer in the hardfault state (the ones stacked for the exception)