Hi Yeping,
On Fri, Jul 19, 2024 at 2:02 PM <[email protected]> wrote:
>
> Hi Tao,
> I'm sorry I forget my vmlinux is with IKCONFIG enabled, so yesterday's test
> did not cover the branch where tbnz is located.
>
> > Thank you for the improvements to the patch.
> > I have verified this patch and found no problems. After applying this
> > patch, command bt -a
> > will not cause segfault issue, and the irq_stack_size in crash tools has
> > correct value.
>
> I found that that patch not work well due to this lines:
> > + thread_shift = stol(pos2 + 1,
> > + RETURN_ON_ERROR|QUIET,
> > + &errflag);
> By disable the `QUIET` flag, the crash tool output error:
> crash: not a valid number: 15, 0xffffffc00801081c <vectors+28>
>
Yeah, thanks for the testing, it is indeed a failure.
> I think stol() function cannot extract a single digit from char* with
> non-numeric characters, so I use sscanf() in following patch which can work
> well.
Understood. The reason I didn't use sscanf, is that currently the
disassembly gives us a decimal value as #15, so we can sscanf it by
"%ld". What about somehow the disassembly gives us hex values like:
#0xe? It won't work by then. Any ideas for this?
In addition, let's just wait a while to see Lianbo's idea about the
tbnz approach. If he doesn't accept this approach then we don't need
to improve on this.
Thanks,
Tao Liu
>
> ---
> arm64.c | 14 +++++---------
> 1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/arm64.c b/arm64.c
> index 81c4eeb..26af590 100644
> --- a/arm64.c
> +++ b/arm64.c
> @@ -5031,16 +5031,12 @@ static ulong arm64_set_irq_stack_size(void)
> while (fgets(buf1, BUFSIZE, pc->tmpfile)) {
> if ((pos1 = strstr(buf1, "tbnz"))) {
> if ((pos2 = strchr(pos1, '#'))) {
> - thread_shift = stol(pos2 + 1,
> - RETURN_ON_ERROR|QUIET,
> - &errflag);
> - if (errflag) {
> - thread_shift = 0;
> - } else if (CRASHDEBUG(1)) {
> - error(INFO, "Detect thread
> shift"
> - " via tbnz %ld\n",
> thread_shift);
> + if (sscanf(pos2 + 1, "%ld",
> &thread_shift) == 1) {
> + if (CRASHDEBUG(1)){
> + error(INFO, "Detect
> thread shift via tbnz %ld\n", thread_shift);
> + }
> + break;
> }
> - break;
> }
> }
> }
> --
> 2.25.1
>
> Thanks,
> Yeping.ZHENG
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