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