tools/perf/util/dwarf-regs.c

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

File Facts

System
Linux kernel
Corpus path
tools/perf/util/dwarf-regs.c
Extension
.c
Size
6005 bytes
Lines
238
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
/*
 * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
 *
 * Written by: Masami Hiramatsu <mhiramat@kernel.org>
 */

#include <stdlib.h>
#include <string.h>
#include <debug.h>
#include <dwarf-regs.h>
#include <elf.h>
#include <errno.h>
#include <linux/kernel.h>

/* Define const char * {arch}_register_tbl[] */
#define DEFINE_DWARF_REGSTR_TABLE
#include "../arch/x86/include/dwarf-regs-table.h"
#include "../arch/arm/include/dwarf-regs-table.h"
#include "../arch/arm64/include/dwarf-regs-table.h"
#include "../arch/sh/include/dwarf-regs-table.h"
#include "../arch/powerpc/include/dwarf-regs-table.h"
#include "../arch/riscv/include/dwarf-regs-table.h"
#include "../arch/s390/include/dwarf-regs-table.h"
#include "../arch/sparc/include/dwarf-regs-table.h"
#include "../arch/xtensa/include/dwarf-regs-table.h"
#include "../arch/mips/include/dwarf-regs-table.h"
#include "../arch/loongarch/include/dwarf-regs-table.h"

/* Return architecture dependent register string (for kprobe-tracer) */
const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags)
{
	#define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)

	if (machine == EM_NONE) {
		/* Generic arch - use host arch */
		machine = EM_HOST;
	}
	switch (machine) {
	case EM_386:
		return __get_dwarf_regstr(x86_32_regstr_tbl, n);
	case EM_X86_64:
		return __get_dwarf_regstr(x86_64_regstr_tbl, n);
	case EM_ARM:
		return __get_dwarf_regstr(arm_regstr_tbl, n);
	case EM_AARCH64:
		return __get_dwarf_regstr(aarch64_regstr_tbl, n);
	case EM_CSKY:
		return __get_csky_regstr(n, flags);
	case EM_SH:
		return __get_dwarf_regstr(sh_regstr_tbl, n);
	case EM_S390:
		return __get_dwarf_regstr(s390_regstr_tbl, n);
	case EM_PPC:
	case EM_PPC64:
		return __get_dwarf_regstr(powerpc_regstr_tbl, n);
	case EM_RISCV:
		return __get_dwarf_regstr(riscv_regstr_tbl, n);
	case EM_SPARC:
	case EM_SPARCV9:
		return __get_dwarf_regstr(sparc_regstr_tbl, n);
	case EM_XTENSA:
		return __get_dwarf_regstr(xtensa_regstr_tbl, n);
	case EM_MIPS:
		return __get_dwarf_regstr(mips_regstr_tbl, n);
	case EM_LOONGARCH:
		return __get_dwarf_regstr(loongarch_regstr_tbl, n);
	default:
		pr_err("ELF MACHINE %x is not supported.\n", machine);
	}
	return NULL;

	#undef __get_dwarf_regstr
}

static int __get_dwarf_regnum(const char *const *regstr, size_t num_regstr, const char *name)
{
	for (size_t i = 0; i < num_regstr; i++) {
		if (regstr[i] && !strcmp(regstr[i], name))
			return i;
	}
	return -ENOENT;
}

/* Return DWARF register number from architecture register name */
int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags)
{
	char *regname = strdup(name);
	int reg = -1;
	char *p;

Annotation

Implementation Notes