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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Mapping of DWARF debug register numbers into register names.4 *5 * Copyright (C) 2010 Will Deacon, ARM Ltd.6 */7 8#include <stddef.h>9#include <linux/stringify.h>10#include <dwarf-regs.h>11 12struct pt_regs_dwarfnum {13	const char *name;14	unsigned int dwarfnum;15};16 17#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}18#define GPR_DWARFNUM_NAME(num) \19	{.name = __stringify(%r##num), .dwarfnum = num}20#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}21 22/*23 * Reference:24 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf25 */26static const struct pt_regs_dwarfnum regdwarfnum_table[] = {27	GPR_DWARFNUM_NAME(0),28	GPR_DWARFNUM_NAME(1),29	GPR_DWARFNUM_NAME(2),30	GPR_DWARFNUM_NAME(3),31	GPR_DWARFNUM_NAME(4),32	GPR_DWARFNUM_NAME(5),33	GPR_DWARFNUM_NAME(6),34	GPR_DWARFNUM_NAME(7),35	GPR_DWARFNUM_NAME(8),36	GPR_DWARFNUM_NAME(9),37	GPR_DWARFNUM_NAME(10),38	REG_DWARFNUM_NAME("%fp", 11),39	REG_DWARFNUM_NAME("%ip", 12),40	REG_DWARFNUM_NAME("%sp", 13),41	REG_DWARFNUM_NAME("%lr", 14),42	REG_DWARFNUM_NAME("%pc", 15),43	REG_DWARFNUM_END,44};45 46/**47 * get_arch_regstr() - lookup register name from it's DWARF register number48 * @n:	the DWARF register number49 *50 * get_arch_regstr() returns the name of the register in struct51 * regdwarfnum_table from it's DWARF register number. If the register is not52 * found in the table, this returns NULL;53 */54const char *get_arch_regstr(unsigned int n)55{56	const struct pt_regs_dwarfnum *roff;57	for (roff = regdwarfnum_table; roff->name != NULL; roff++)58		if (roff->dwarfnum == n)59			return roff->name;60	return NULL;61}62