On 09/09/19 23:00, Bill Wendling wrote:
> The "lea" instruction cannot load the effective address into a memory
> location. The "g" constraint allows a compiler to use a memory location.
> A compiler that uses a register destination does so only because one is
> available. Use a general register constraint to make sure it always uses
> a register.
>
> Signed-off-by: Bill Wendling <morbo@xxxxxxxxxx>
> ---
> x86/debug.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/x86/debug.c b/x86/debug.c
> index f66d1d0..2327dac 100644
> --- a/x86/debug.c
> +++ b/x86/debug.c
> @@ -113,7 +113,7 @@ int main(int ac, char **av)
> "and $~(1<<8),%%rax\n\t"
> "push %%rax\n\t"
> "popf\n\t"
> - : "=g" (start) : : "rax");
> + : "=r" (start) : : "rax");
> report("single step",
> n == 3 &&
> db_addr[0] == start+1+6 && dr6[0] == 0xffff4ff0 &&
>
There is another occurrence, also this has spaces and tabs messed up as
well. Fixed up and queued.
Paolo
