parse-regs-options.c 1.83 KB
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// SPDX-License-Identifier: GPL-2.0
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#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
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#include "util/debug.h"
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#include <subcmd/parse-options.h>
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#include "util/perf_regs.h"
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#include "util/parse-regs-options.h"

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static int
__parse_regs(const struct option *opt, const char *str, int unset, bool intr)
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{
	uint64_t *mode = (uint64_t *)opt->value;
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	const struct sample_reg *r = NULL;
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	char *s, *os = NULL, *p;
	int ret = -1;
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	uint64_t mask;
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	if (unset)
		return 0;

	/*
	 * cannot set it twice
	 */
	if (*mode)
		return -1;

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	if (intr)
		mask = arch__intr_reg_mask();
	else
		mask = arch__user_reg_mask();

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	/* 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: ");
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				for (r = arch__sample_reg_masks(); r->name; r++) {
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					if (r->mask & mask)
						fprintf(stderr, "%s ", r->name);
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				}
				fputc('\n', stderr);
				/* just printing available regs */
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				goto error;
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			}
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			for (r = arch__sample_reg_masks(); r->name; r++) {
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				if ((r->mask & mask) && !strcasecmp(s, r->name))
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					break;
			}
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			if (!r || !r->name) {
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				ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
					    s, intr ? "-I" : "--user-regs=");
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				goto error;
			}

			*mode |= r->mask;

			if (!p)
				break;

			s = p + 1;
		}
	}
	ret = 0;

	/* default to all possible regs */
	if (*mode == 0)
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		*mode = mask;
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error:
	free(os);
	return ret;
}
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int
parse_user_regs(const struct option *opt, const char *str, int unset)
{
	return __parse_regs(opt, str, unset, false);
}

int
parse_intr_regs(const struct option *opt, const char *str, int unset)
{
	return __parse_regs(opt, str, unset, true);
}