On 2022/08/29 22:45, Tao Liu wrote:
> The previous implementation to locate the call instruction is
> to strstr "call", then check whether the previous char is ' '
> or '\t'. The implementation is problematic. For example it
> cannot resolve the following disassembly string:
>
> "0xffffffffc06e6399 <nfs_callback_up+118>:\tcall 0xffffffff9ac8792f <printk>"
>
> strstr will locate the "_call" and char check fails,
> as a result, extract_hex fail to get the calling address.
>
> This patch fix the issue by strstr "\tcall" and " call", to
> locate the correct call instruction.
Is it possible to add an example failure output of any command and
fixed one?
Thanks,
Kazu
>
> Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
> ---
> v1 -> v2: No modification, sent together with patch1
> ---
> x86_64.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/x86_64.c b/x86_64.c
> index dfada48..74bd1bb 100644
> --- a/x86_64.c
> +++ b/x86_64.c
> @@ -4432,8 +4432,7 @@ x86_64_function_called_by(ulong rip)
> if (gdb_pass_through(buf, pc->tmpfile2, GNU_RETURN_ON_ERROR)) {
> rewind(pc->tmpfile2);
> while (fgets(buf, BUFSIZE, pc->tmpfile2)) {
> - if ((p1 = strstr(buf, "call")) &&
> - whitespace(*(p1-1))) {
> + if ((p1 = strstr(buf, " call")) || (p1 = strstr(buf, "\tcall"))) {
> if (extract_hex(p1, &value, NULLCHAR, TRUE))
> break;
> }
--
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