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 <linux/stringify.h> 19 #include "util.h" 20 21 struct pt_regs_dwarfnum { 22 const char *name; 23 unsigned int dwarfnum; 24 unsigned int ptregs_offset; 25 }; 26 27 #define REG_DWARFNUM_NAME(r, num) \ 28 {.name = __stringify(%)__stringify(r), .dwarfnum = num, \ 29 .ptregs_offset = offsetof(struct pt_regs, r)} 30 #define GPR_DWARFNUM_NAME(num) \ 31 {.name = __stringify(%gpr##num), .dwarfnum = num, \ 32 .ptregs_offset = offsetof(struct pt_regs, gpr[num])} 33 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0} 34 35 /* 36 * Reference: 37 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html 38 */ 39 static const struct pt_regs_dwarfnum regdwarfnum_table[] = { 40 GPR_DWARFNUM_NAME(0), 41 GPR_DWARFNUM_NAME(1), 42 GPR_DWARFNUM_NAME(2), 43 GPR_DWARFNUM_NAME(3), 44 GPR_DWARFNUM_NAME(4), 45 GPR_DWARFNUM_NAME(5), 46 GPR_DWARFNUM_NAME(6), 47 GPR_DWARFNUM_NAME(7), 48 GPR_DWARFNUM_NAME(8), 49 GPR_DWARFNUM_NAME(9), 50 GPR_DWARFNUM_NAME(10), 51 GPR_DWARFNUM_NAME(11), 52 GPR_DWARFNUM_NAME(12), 53 GPR_DWARFNUM_NAME(13), 54 GPR_DWARFNUM_NAME(14), 55 GPR_DWARFNUM_NAME(15), 56 GPR_DWARFNUM_NAME(16), 57 GPR_DWARFNUM_NAME(17), 58 GPR_DWARFNUM_NAME(18), 59 GPR_DWARFNUM_NAME(19), 60 GPR_DWARFNUM_NAME(20), 61 GPR_DWARFNUM_NAME(21), 62 GPR_DWARFNUM_NAME(22), 63 GPR_DWARFNUM_NAME(23), 64 GPR_DWARFNUM_NAME(24), 65 GPR_DWARFNUM_NAME(25), 66 GPR_DWARFNUM_NAME(26), 67 GPR_DWARFNUM_NAME(27), 68 GPR_DWARFNUM_NAME(28), 69 GPR_DWARFNUM_NAME(29), 70 GPR_DWARFNUM_NAME(30), 71 GPR_DWARFNUM_NAME(31), 72 REG_DWARFNUM_NAME(msr, 66), 73 REG_DWARFNUM_NAME(ctr, 109), 74 REG_DWARFNUM_NAME(link, 108), 75 REG_DWARFNUM_NAME(xer, 101), 76 REG_DWARFNUM_NAME(dar, 119), 77 REG_DWARFNUM_NAME(dsisr, 118), 78 REG_DWARFNUM_END, 79 }; 80 81 /** 82 * get_arch_regstr() - lookup register name from it's DWARF register number 83 * @n: the DWARF register number 84 * 85 * get_arch_regstr() returns the name of the register in struct 86 * regdwarfnum_table from it's DWARF register number. If the register is not 87 * found in the table, this returns NULL; 88 */ 89 const char *get_arch_regstr(unsigned int n) 90 { 91 const struct pt_regs_dwarfnum *roff; 92 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 93 if (roff->dwarfnum == n) 94 return roff->name; 95 return NULL; 96 } 97 98 int regs_query_register_offset(const char *name) 99 { 100 const struct pt_regs_dwarfnum *roff; 101 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 102 if (!strcmp(roff->name, name)) 103 return roff->ptregs_offset; 104 return -EINVAL; 105 } 106