1 /* 2 * Mapping of DWARF debug register numbers into register names. 3 * 4 * Copyright (C) 2010 Ian Munsie, IBM Corporation. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <stddef.h> 13 #include <errno.h> 14 #include <string.h> 15 #include <dwarf-regs.h> 16 #include <linux/ptrace.h> 17 #include <linux/kernel.h> 18 #include "util.h" 19 20 struct pt_regs_dwarfnum { 21 const char *name; 22 unsigned int dwarfnum; 23 unsigned int ptregs_offset; 24 }; 25 26 #define REG_DWARFNUM_NAME(r, num) \ 27 {.name = STR(%)STR(r), .dwarfnum = num, \ 28 .ptregs_offset = offsetof(struct pt_regs, r)} 29 #define GPR_DWARFNUM_NAME(num) \ 30 {.name = STR(%gpr##num), .dwarfnum = num, \ 31 .ptregs_offset = offsetof(struct pt_regs, gpr[num])} 32 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0} 33 34 /* 35 * Reference: 36 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html 37 */ 38 static const struct pt_regs_dwarfnum regdwarfnum_table[] = { 39 GPR_DWARFNUM_NAME(0), 40 GPR_DWARFNUM_NAME(1), 41 GPR_DWARFNUM_NAME(2), 42 GPR_DWARFNUM_NAME(3), 43 GPR_DWARFNUM_NAME(4), 44 GPR_DWARFNUM_NAME(5), 45 GPR_DWARFNUM_NAME(6), 46 GPR_DWARFNUM_NAME(7), 47 GPR_DWARFNUM_NAME(8), 48 GPR_DWARFNUM_NAME(9), 49 GPR_DWARFNUM_NAME(10), 50 GPR_DWARFNUM_NAME(11), 51 GPR_DWARFNUM_NAME(12), 52 GPR_DWARFNUM_NAME(13), 53 GPR_DWARFNUM_NAME(14), 54 GPR_DWARFNUM_NAME(15), 55 GPR_DWARFNUM_NAME(16), 56 GPR_DWARFNUM_NAME(17), 57 GPR_DWARFNUM_NAME(18), 58 GPR_DWARFNUM_NAME(19), 59 GPR_DWARFNUM_NAME(20), 60 GPR_DWARFNUM_NAME(21), 61 GPR_DWARFNUM_NAME(22), 62 GPR_DWARFNUM_NAME(23), 63 GPR_DWARFNUM_NAME(24), 64 GPR_DWARFNUM_NAME(25), 65 GPR_DWARFNUM_NAME(26), 66 GPR_DWARFNUM_NAME(27), 67 GPR_DWARFNUM_NAME(28), 68 GPR_DWARFNUM_NAME(29), 69 GPR_DWARFNUM_NAME(30), 70 GPR_DWARFNUM_NAME(31), 71 REG_DWARFNUM_NAME(msr, 66), 72 REG_DWARFNUM_NAME(ctr, 109), 73 REG_DWARFNUM_NAME(link, 108), 74 REG_DWARFNUM_NAME(xer, 101), 75 REG_DWARFNUM_NAME(dar, 119), 76 REG_DWARFNUM_NAME(dsisr, 118), 77 REG_DWARFNUM_END, 78 }; 79 80 /** 81 * get_arch_regstr() - lookup register name from it's DWARF register number 82 * @n: the DWARF register number 83 * 84 * get_arch_regstr() returns the name of the register in struct 85 * regdwarfnum_table from it's DWARF register number. If the register is not 86 * found in the table, this returns NULL; 87 */ 88 const char *get_arch_regstr(unsigned int n) 89 { 90 const struct pt_regs_dwarfnum *roff; 91 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 92 if (roff->dwarfnum == n) 93 return roff->name; 94 return NULL; 95 } 96 97 int regs_query_register_offset(const char *name) 98 { 99 const struct pt_regs_dwarfnum *roff; 100 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 101 if (!strcmp(roff->name, name)) 102 return roff->ptregs_offset; 103 return -EINVAL; 104 } 105