Re: [PATCH v1 3/4] perf record: add ability to name registers to record
From: Stephane Eranian
Date: Thu Aug 20 2015 - 16:02:35 EST
On Thu, Aug 20, 2015 at 4:18 AM, Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> On Wed, Aug 19, 2015 at 10:38:25AM +0200, Stephane Eranian wrote:
>
> SNIP
>
>> diff --git a/tools/perf/util/parse-regs-options.c b/tools/perf/util/parse-regs-options.c
>> new file mode 100644
>> index 0000000..4f2c1c2
>> --- /dev/null
>> +++ b/tools/perf/util/parse-regs-options.c
>> @@ -0,0 +1,71 @@
>> +#include "perf.h"
>> +#include "util/util.h"
>> +#include "util/debug.h"
>> +#include "util/parse-options.h"
>> +#include "util/parse-regs-options.h"
>> +
>> +int
>> +parse_regs(const struct option *opt, const char *str, int unset)
>> +{
>> + uint64_t *mode = (uint64_t *)opt->value;
>> + const struct sample_reg *r;
>> + char *s, *os = NULL, *p;
>> + int ret = -1;
>> +
>> + if (unset)
>> + return 0;
>> +
>> + /*
>> + * cannot set it twice
>> + */
>> + if (*mode)
>> + return -1;
>> +
>> + /* str may be NULL in case no arg is passed to -I */
>> + if (str) {
>> + /* because str is read-only */
>> + s = os = strdup(str);
>> + if (!s)
>> + return -1;
>> +
>> + for (;;) {
>> + p = strchr(s, ',');
>> + if (p)
>> + *p = '\0';
>> +
>> + if (!strcmp(s, "?")) {
>> + fprintf(stderr, "available registers: ");
>> + for (r = sample_reg_masks; r->name; r++) {
>> + fprintf(stderr, "%s ", r->name);
>> + }
>> + fputc('\n', stderr);
>> + /* just printing available regs */
>> + return -1;
>> + }
>> + for (r = sample_reg_masks; r->name; r++) {
>
> the new 'I' is arch dependent, would this fail to link on
> other archs besides x86_64 ? haven't tried though
>
It should not if there is a weak symbol for the sample_regs_masks[].
I think I forgot to add that. Will do in v2.
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