1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Mapping of DWARF debug register numbers into register names. 4 * 5 * Copyright (C) 2010 Ian Munsie, IBM Corporation. 6 */ 7 8 #include <stddef.h> 9 #include <errno.h> 10 #include <string.h> 11 #include <dwarf-regs.h> 12 #include <linux/ptrace.h> 13 #include <linux/kernel.h> 14 #include <linux/stringify.h> 15 #include "util.h" 16 17 struct pt_regs_dwarfnum { 18 const char *name; 19 unsigned int dwarfnum; 20 unsigned int ptregs_offset; 21 }; 22 23 #define REG_DWARFNUM_NAME(r, num) \ 24 {.name = __stringify(%)__stringify(r), .dwarfnum = num, \ 25 .ptregs_offset = offsetof(struct pt_regs, r)} 26 #define GPR_DWARFNUM_NAME(num) \ 27 {.name = __stringify(%gpr##num), .dwarfnum = num, \ 28 .ptregs_offset = offsetof(struct pt_regs, gpr[num])} 29 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0} 30 31 /* 32 * Reference: 33 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html 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 GPR_DWARFNUM_NAME(30), 67 GPR_DWARFNUM_NAME(31), 68 REG_DWARFNUM_NAME(msr, 66), 69 REG_DWARFNUM_NAME(ctr, 109), 70 REG_DWARFNUM_NAME(link, 108), 71 REG_DWARFNUM_NAME(xer, 101), 72 REG_DWARFNUM_NAME(dar, 119), 73 REG_DWARFNUM_NAME(dsisr, 118), 74 REG_DWARFNUM_END, 75 }; 76 77 /** 78 * get_arch_regstr() - lookup register name from it's DWARF register number 79 * @n: the DWARF register number 80 * 81 * get_arch_regstr() returns the name of the register in struct 82 * regdwarfnum_table from it's DWARF register number. If the register is not 83 * found in the table, this returns NULL; 84 */ 85 const char *get_arch_regstr(unsigned int n) 86 { 87 const struct pt_regs_dwarfnum *roff; 88 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 89 if (roff->dwarfnum == n) 90 return roff->name; 91 return NULL; 92 } 93 94 int regs_query_register_offset(const char *name) 95 { 96 const struct pt_regs_dwarfnum *roff; 97 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 98 if (!strcmp(roff->name, name)) 99 return roff->ptregs_offset; 100 return -EINVAL; 101 } 102