1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Mapping of DWARF debug register numbers into register names. 4 * 5 * Copyright (C) 2010 Will Deacon, ARM Ltd. 6 */ 7 8 #include <errno.h> 9 #include <stddef.h> 10 #include <string.h> 11 #include <dwarf-regs.h> 12 #include <linux/ptrace.h> /* for struct user_pt_regs */ 13 #include <linux/stringify.h> 14 #include "util.h" 15 16 struct pt_regs_dwarfnum { 17 const char *name; 18 unsigned int dwarfnum; 19 }; 20 21 #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} 22 #define GPR_DWARFNUM_NAME(num) \ 23 {.name = __stringify(%x##num), .dwarfnum = num} 24 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} 25 #define DWARFNUM2OFFSET(index) \ 26 (index * sizeof((struct user_pt_regs *)0)->regs[0]) 27 28 /* 29 * Reference: 30 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf 31 */ 32 static const struct pt_regs_dwarfnum regdwarfnum_table[] = { 33 GPR_DWARFNUM_NAME(0), 34 GPR_DWARFNUM_NAME(1), 35 GPR_DWARFNUM_NAME(2), 36 GPR_DWARFNUM_NAME(3), 37 GPR_DWARFNUM_NAME(4), 38 GPR_DWARFNUM_NAME(5), 39 GPR_DWARFNUM_NAME(6), 40 GPR_DWARFNUM_NAME(7), 41 GPR_DWARFNUM_NAME(8), 42 GPR_DWARFNUM_NAME(9), 43 GPR_DWARFNUM_NAME(10), 44 GPR_DWARFNUM_NAME(11), 45 GPR_DWARFNUM_NAME(12), 46 GPR_DWARFNUM_NAME(13), 47 GPR_DWARFNUM_NAME(14), 48 GPR_DWARFNUM_NAME(15), 49 GPR_DWARFNUM_NAME(16), 50 GPR_DWARFNUM_NAME(17), 51 GPR_DWARFNUM_NAME(18), 52 GPR_DWARFNUM_NAME(19), 53 GPR_DWARFNUM_NAME(20), 54 GPR_DWARFNUM_NAME(21), 55 GPR_DWARFNUM_NAME(22), 56 GPR_DWARFNUM_NAME(23), 57 GPR_DWARFNUM_NAME(24), 58 GPR_DWARFNUM_NAME(25), 59 GPR_DWARFNUM_NAME(26), 60 GPR_DWARFNUM_NAME(27), 61 GPR_DWARFNUM_NAME(28), 62 GPR_DWARFNUM_NAME(29), 63 REG_DWARFNUM_NAME("%lr", 30), 64 REG_DWARFNUM_NAME("%sp", 31), 65 REG_DWARFNUM_END, 66 }; 67 68 /** 69 * get_arch_regstr() - lookup register name from it's DWARF register number 70 * @n: the DWARF register number 71 * 72 * get_arch_regstr() returns the name of the register in struct 73 * regdwarfnum_table from it's DWARF register number. If the register is not 74 * found in the table, this returns NULL; 75 */ 76 const char *get_arch_regstr(unsigned int n) 77 { 78 const struct pt_regs_dwarfnum *roff; 79 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 80 if (roff->dwarfnum == n) 81 return roff->name; 82 return NULL; 83 } 84 85 int regs_query_register_offset(const char *name) 86 { 87 const struct pt_regs_dwarfnum *roff; 88 89 for (roff = regdwarfnum_table; roff->name != NULL; roff++) 90 if (!strcmp(roff->name, name)) 91 return DWARFNUM2OFFSET(roff->dwarfnum); 92 return -EINVAL; 93 } 94