1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 12 struct 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.pdf 25 */ 26 static 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 number 48 * @n: the DWARF register number 49 * 50 * get_arch_regstr() returns the name of the register in struct 51 * regdwarfnum_table from it's DWARF register number. If the register is not 52 * found in the table, this returns NULL; 53 */ 54 const 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