1 /* 2 * Mapping of DWARF debug register numbers into register names. 3 * 4 * Copyright (C) 2010 Will Deacon, ARM Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <stddef.h> 12 #include <linux/stringify.h> 13 #include <dwarf-regs.h> 14 15 struct pt_regs_dwarfnum { 16 const char *name; 17 unsigned int dwarfnum; 18 }; 19 20 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} 21 #define GPR_DWARFNUM_NAME(num) \ 22 {.name = __stringify(%r##num), .dwarfnum = num} 23 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} 24 25 /* 26 * Reference: 27 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.pdf 28 */ 29 static const struct pt_regs_dwarfnum regdwarfnum_table[] = { 30 GPR_DWARFNUM_NAME(0), 31 GPR_DWARFNUM_NAME(1), 32 GPR_DWARFNUM_NAME(2), 33 GPR_DWARFNUM_NAME(3), 34 GPR_DWARFNUM_NAME(4), 35 GPR_DWARFNUM_NAME(5), 36 GPR_DWARFNUM_NAME(6), 37 GPR_DWARFNUM_NAME(7), 38 GPR_DWARFNUM_NAME(8), 39 GPR_DWARFNUM_NAME(9), 40 GPR_DWARFNUM_NAME(10), 41 REG_DWARFNUM_NAME("%fp", 11), 42 REG_DWARFNUM_NAME("%ip", 12), 43 REG_DWARFNUM_NAME("%sp", 13), 44 REG_DWARFNUM_NAME("%lr", 14), 45 REG_DWARFNUM_NAME("%pc", 15), 46 REG_DWARFNUM_END, 47 }; 48 49 /** 50 * get_arch_regstr() - lookup register name from it's DWARF register number 51 * @n: the DWARF register number 52 * 53 * get_arch_regstr() returns the name of the register in struct 54 * regdwarfnum_table from it's DWARF register number. If the register is not 55 * found in the table, this returns NULL; 56 */ 57 const char *get_arch_regstr(unsigned int n) 58 { 59 const struct pt_regs_dwarfnum *roff; 60 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 61 if (roff->dwarfnum == n) 62 return roff->name; 63 return NULL; 64 } 65