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 <dwarf-regs.h> 9 10 #define PPC_OP(op) (((op) >> 26) & 0x3F) 11 #define PPC_RA(a) (((a) >> 16) & 0x1f) 12 #define PPC_RT(t) (((t) >> 21) & 0x1f) 13 #define PPC_RB(b) (((b) >> 11) & 0x1f) 14 #define PPC_D(D) ((D) & 0xfffe) 15 #define PPC_DS(DS) ((DS) & 0xfffc) 16 #define OP_LD 58 17 #define OP_STD 62 18 19 static int get_source_reg(u32 raw_insn) 20 { 21 return PPC_RA(raw_insn); 22 } 23 24 static int get_target_reg(u32 raw_insn) 25 { 26 return PPC_RT(raw_insn); 27 } 28 29 static int get_offset_opcode(u32 raw_insn) 30 { 31 int opcode = PPC_OP(raw_insn); 32 33 /* DS- form */ 34 if ((opcode == OP_LD) || (opcode == OP_STD)) 35 return PPC_DS(raw_insn); 36 else 37 return PPC_D(raw_insn); 38 } 39 40 /* 41 * Fills the required fields for op_loc depending on if it 42 * is a source or target. 43 * D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT 44 * DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT 45 * X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT 46 */ 47 void get_powerpc_regs(u32 raw_insn, int is_source, 48 struct annotated_op_loc *op_loc) 49 { 50 if (is_source) 51 op_loc->reg1 = get_source_reg(raw_insn); 52 else 53 op_loc->reg1 = get_target_reg(raw_insn); 54 55 if (op_loc->multi_regs) 56 op_loc->reg2 = PPC_RB(raw_insn); 57 58 /* TODO: Implement offset handling for X Form */ 59 if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31)) 60 op_loc->offset = get_offset_opcode(raw_insn); 61 } 62