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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 16struct 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.html33 */34static 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 number78 * @n: the DWARF register number79 *80 * get_arch_regstr() returns the name of the register in struct81 * regdwarfnum_table from it's DWARF register number. If the register is not82 * found in the table, this returns NULL;83 */84const 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 93int 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}101 102#define PPC_OP(op) (((op) >> 26) & 0x3F)103#define PPC_RA(a) (((a) >> 16) & 0x1f)104#define PPC_RT(t) (((t) >> 21) & 0x1f)105#define PPC_RB(b) (((b) >> 11) & 0x1f)106#define PPC_D(D) ((D) & 0xfffe)107#define PPC_DS(DS) ((DS) & 0xfffc)108#define OP_LD 58109#define OP_STD 62110 111static int get_source_reg(u32 raw_insn)112{113 return PPC_RA(raw_insn);114}115 116static int get_target_reg(u32 raw_insn)117{118 return PPC_RT(raw_insn);119}120 121static int get_offset_opcode(u32 raw_insn)122{123 int opcode = PPC_OP(raw_insn);124 125 /* DS- form */126 if ((opcode == OP_LD) || (opcode == OP_STD))127 return PPC_DS(raw_insn);128 else129 return PPC_D(raw_insn);130}131 132/*133 * Fills the required fields for op_loc depending on if it134 * is a source or target.135 * D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT136 * DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT137 * X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT138 */139void get_powerpc_regs(u32 raw_insn, int is_source,140 struct annotated_op_loc *op_loc)141{142 if (is_source)143 op_loc->reg1 = get_source_reg(raw_insn);144 else145 op_loc->reg1 = get_target_reg(raw_insn);146 147 if (op_loc->multi_regs)148 op_loc->reg2 = PPC_RB(raw_insn);149 150 /* TODO: Implement offset handling for X Form */151 if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31))152 op_loc->offset = get_offset_opcode(raw_insn);153}154