Re: [Qemu-devel] [PATCH for-2.11 5/6] ppc: simplify cpu model lookup by PVR

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Aug 24, 2017 at 10:21:50AM +0200, Igor Mammedov wrote:
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  target/ppc/translate_init.c | 27 +++++++++++----------------
>  1 file changed, 11 insertions(+), 16 deletions(-)
> 
> diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> index f1a559d..ca9f1e3 100644
> --- a/target/ppc/translate_init.c
> +++ b/target/ppc/translate_init.c
> @@ -34,6 +34,7 @@
>  #include "hw/ppc/ppc.h"
>  #include "mmu-book3s-v3.h"
>  #include "sysemu/qtest.h"
> +#include "qemu/cutils.h"
>  
>  //#define PPC_DUMP_CPU
>  //#define PPC_DEBUG_SPR
> @@ -10203,22 +10204,16 @@ static ObjectClass *ppc_cpu_class_by_name(const char *name)
>      char *cpu_model, *typename;
>      ObjectClass *oc;
>      const char *p;
> -    int i, len;
> -
> -    /* Check if the given name is a PVR */
> -    len = strlen(name);
> -    if (len == 10 && name[0] == '0' && name[1] == 'x') {
> -        p = name + 2;
> -        goto check_pvr;
> -    } else if (len == 8) {
> -        p = name;
> -    check_pvr:
> -        for (i = 0; i < 8; i++) {
> -            if (!qemu_isxdigit(*p++))
> -                break;
> -        }
> -        if (i == 8) {
> -            return OBJECT_CLASS(ppc_cpu_class_by_pvr(strtoul(name, NULL, 16)));
> +    unsigned long pvr;
> +
> +    /* Lookup by PVR if cpu_model is valid 8 digit hex number
> +     * (excl: 0x prefix if present)
> +     */
> +    if (!qemu_strtoul(name, &p, 16, &pvr)) {
> +        int len = p - name;
> +        len = (len == 10) && (name[1] == 'x') ? len - 2 : len;
> +        if (len == 8) {
> +            return OBJECT_CLASS(ppc_cpu_class_by_pvr(pvr));

This doesn't look quite right.  A hex string of a PVR followed by
other stuff isn't a valid option, so if p (endptr) doesn't point to
the end of the string, then we shouldn't be using this path (from the
looks of qemu_strtoul() we can simply omit the endptr parameter to get
that behaviour).  I'm not sure what the messing around with len is
for, either.  If it's a valid hex string we can try this, I don't see
that we need further checks.

>          }
>      }
>  

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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