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 <errno.h> 12 #include <stddef.h> 13 #include <string.h> 14 #include <dwarf-regs.h> 15 #include <linux/ptrace.h> /* for struct user_pt_regs */ 16 #include <linux/stringify.h> 17 #include "util.h" 18 19 struct pt_regs_dwarfnum { 20 const char *name; 21 unsigned int dwarfnum; 22 }; 23 24 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} 25 #define GPR_DWARFNUM_NAME(num) \ 26 {.name = __stringify(%x##num), .dwarfnum = num} 27 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} 28 #define DWARFNUM2OFFSET(index) \ 29 (index * sizeof((struct user_pt_regs *)0)->regs[0]) 30 31 /* 32 * Reference: 33 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf 34 */ 35 static const struct pt_regs_dwarfnum regdwarfnum_table[] = { 36 GPR_DWARFNUM_NAME(0), 37 GPR_DWARFNUM_NAME(1), 38 GPR_DWARFNUM_NAME(2), 39 GPR_DWARFNUM_NAME(3), 40 GPR_DWARFNUM_NAME(4), 41 GPR_DWARFNUM_NAME(5), 42 GPR_DWARFNUM_NAME(6), 43 GPR_DWARFNUM_NAME(7), 44 GPR_DWARFNUM_NAME(8), 45 GPR_DWARFNUM_NAME(9), 46 GPR_DWARFNUM_NAME(10), 47 GPR_DWARFNUM_NAME(11), 48 GPR_DWARFNUM_NAME(12), 49 GPR_DWARFNUM_NAME(13), 50 GPR_DWARFNUM_NAME(14), 51 GPR_DWARFNUM_NAME(15), 52 GPR_DWARFNUM_NAME(16), 53 GPR_DWARFNUM_NAME(17), 54 GPR_DWARFNUM_NAME(18), 55 GPR_DWARFNUM_NAME(19), 56 GPR_DWARFNUM_NAME(20), 57 GPR_DWARFNUM_NAME(21), 58 GPR_DWARFNUM_NAME(22), 59 GPR_DWARFNUM_NAME(23), 60 GPR_DWARFNUM_NAME(24), 61 GPR_DWARFNUM_NAME(25), 62 GPR_DWARFNUM_NAME(26), 63 GPR_DWARFNUM_NAME(27), 64 GPR_DWARFNUM_NAME(28), 65 GPR_DWARFNUM_NAME(29), 66 REG_DWARFNUM_NAME("%lr", 30), 67 REG_DWARFNUM_NAME("%sp", 31), 68 REG_DWARFNUM_END, 69 }; 70 71 /** 72 * get_arch_regstr() - lookup register name from it's DWARF register number 73 * @n: the DWARF register number 74 * 75 * get_arch_regstr() returns the name of the register in struct 76 * regdwarfnum_table from it's DWARF register number. If the register is not 77 * found in the table, this returns NULL; 78 */ 79 const char *get_arch_regstr(unsigned int n) 80 { 81 const struct pt_regs_dwarfnum *roff; 82 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 83 if (roff->dwarfnum == n) 84 return roff->name; 85 return NULL; 86 } 87 88 int regs_query_register_offset(const char *name) 89 { 90 const struct pt_regs_dwarfnum *roff; 91 92 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 93 if (!strcmp(roff->name, name)) 94 return DWARFNUM2OFFSET(roff->dwarfnum); 95 return -EINVAL; 96 } 97