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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