On Sun, Mar 21, 2021 at 04:00:50PM +0100, Ahmad Fatoum wrote:
> Specifying __aligned for a struct member only ensures a relative
> alignment to the start of the struct. To get an absolute alignment,
> we must ensure the struct itself is aligned suitably as well. Do so.
>
> This fixes an issue where printf("%llu" printed bogus values when
> run from a bthread, because gcc va_arg on RISC-V requires 16-bit
> stack alignment.
>
> Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
> ---
> common/bthread.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/common/bthread.c b/common/bthread.c
> index 80b486c99af7..ece02e091da9 100644
> --- a/common/bthread.c
> +++ b/common/bthread.c
> @@ -88,7 +88,7 @@ struct bthread *bthread_create(int (*threadfn)(void *), void *data,
> va_list ap;
> int len;
>
> - bthread = malloc(struct_size(bthread, stack_space, CONFIG_STACK_SIZE));
> + bthread = memalign(16, struct_size(bthread, stack_space, CONFIG_STACK_SIZE));
Wouldn't it be clearer to make the stack an extra allocation instead of
attaching it to struct bthread?
Sascha
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