On Tue, Mar 22, 2022 at 04:59:30PM -0400, Sean Anderson wrote: > These functions are intended to support detecting semihosting and > falling back gracefully to alternative implementations. The test starts > by making semihosting call. SYS_ERRNO is chosen because it should not > mutate any state. If this semihosting call results in an exception > (rather than being caught by the debugger), then the exception handler > should call disable_semihosting() and resume execution after the call. > > Ideally, this would just be part of semihosting by default, and not a > separate config. However, to reduce space ARM SPL doesn't include > exception vectors by default. This means we can't detect if a > semihosting call failed unless we enable them. To avoid forcing them to > be enabled, we use a separate config option. It might also be possible > to try and detect whether a debugger has enabled (by reading HDE from > DSCR), but I wasn't able to figure out a way to do this from all ELs. > > This patch just introduces the generic code to handle detection. The > next patch will implement it for arm64 (but not arm32). > > Signed-off-by: Sean Anderson <sean.ander...@seco.com>
Applied to u-boot/next, thanks! -- Tom
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