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62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Mapping of DWARF debug register numbers into register names.
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*
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* Copyright (C) 2010 Ian Munsie, IBM Corporation.
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*/
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#include <dwarf-regs.h>
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#define PPC_OP(op) (((op) >> 26) & 0x3F)
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#define PPC_RA(a) (((a) >> 16) & 0x1f)
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#define PPC_RT(t) (((t) >> 21) & 0x1f)
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#define PPC_RB(b) (((b) >> 11) & 0x1f)
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#define PPC_D(D) ((D) & 0xfffe)
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#define PPC_DS(DS) ((DS) & 0xfffc)
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#define OP_LD 58
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#define OP_STD 62
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static int get_source_reg(u32 raw_insn)
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{
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return PPC_RA(raw_insn);
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}
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static int get_target_reg(u32 raw_insn)
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{
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return PPC_RT(raw_insn);
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}
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static int get_offset_opcode(u32 raw_insn)
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{
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int opcode = PPC_OP(raw_insn);
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/* DS- form */
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if ((opcode == OP_LD) || (opcode == OP_STD))
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return PPC_DS(raw_insn);
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else
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return PPC_D(raw_insn);
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}
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/*
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* Fills the required fields for op_loc depending on if it
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* is a source or target.
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* D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT
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* DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT
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* X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT
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*/
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void get_powerpc_regs(u32 raw_insn, int is_source,
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struct annotated_op_loc *op_loc)
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{
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if (is_source)
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op_loc->reg1 = get_source_reg(raw_insn);
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else
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op_loc->reg1 = get_target_reg(raw_insn);
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if (op_loc->multi_regs)
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op_loc->reg2 = PPC_RB(raw_insn);
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/* TODO: Implement offset handling for X Form */
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if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31))
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op_loc->offset = get_offset_opcode(raw_insn);
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}
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