tools/perf/util/perf-regs-arch/perf_regs_powerpc.c

Source file repositories/reference/linux-study-clean/tools/perf/util/perf-regs-arch/perf_regs_powerpc.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/perf-regs-arch/perf_regs_powerpc.c
Extension
.c
Size
7358 bytes
Lines
323
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include <errno.h>
#include <string.h>
#include <regex.h>
#include <linux/zalloc.h>

#include "../debug.h"
#include "../event.h"
#include "../header.h"
#include "../perf_regs.h"
#include "../../perf-sys.h"
#include "../../arch/powerpc/util/utils_header.h"
#include "../../arch/powerpc/include/perf_regs.h"

#include <linux/kernel.h>

#define PVR_POWER9		0x004E
#define PVR_POWER10		0x0080
#define PVR_POWER11		0x0082

/* REG or %rREG */
#define SDT_OP_REGEX1  "^(%r)?([1-2]?[0-9]|3[0-1])$"

/* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */
#define SDT_OP_REGEX2  "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$"

static regex_t sdt_op_regex1, sdt_op_regex2;

static int sdt_init_op_regex(void)
{
	static int initialized;
	int ret = 0;

	if (initialized)
		return 0;

	ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED);
	if (ret)
		goto error;

	ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED);
	if (ret)
		goto free_regex1;

	initialized = 1;
	return 0;

free_regex1:
	regfree(&sdt_op_regex1);
error:
	pr_debug4("Regex compilation error.\n");
	return ret;
}

/*
 * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG).
 * Possible variants of OP are:
 *	Format		Example
 *	-------------------------
 *	NUM(REG)	48(18)
 *	-NUM(REG)	-48(18)
 *	NUM(%rREG)	48(%r18)
 *	-NUM(%rREG)	-48(%r18)
 *	REG		18
 *	%rREG		%r18
 *	iNUM		i0
 *	i-NUM		i-1
 *
 * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag
 * and REG form with -mno-regnames. Here REG is general purpose register,
 * which is in 0 to 31 range.
 */
int __perf_sdt_arg_parse_op_powerpc(char *old_op, char **new_op)
{
	int ret, new_len;
	regmatch_t rm[5];
	char prefix;

	/* Constant argument. Uprobe does not support it */
	if (old_op[0] == 'i') {
		pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
		return SDT_ARG_SKIP;
	}

	ret = sdt_init_op_regex();
	if (ret < 0)
		return ret;

	if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) {

Annotation

Implementation Notes