tools/perf/util/dwarf-regs-powerpc.c

   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 }