127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
/*
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* Interactive disassembler (IDA).
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* Copyright (c) 1990-99 by Ilfak Guilfanov.
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* ALL RIGHTS RESERVED.
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* E-mail: ig@datarescue.com
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*
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*
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*/
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#include "st20.hpp"
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//------------------------------------------------------------------------
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static void process_immediate_number(const insn_t &insn, int n)
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{
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set_immd(insn.ea);
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if ( is_defarg(get_flags(insn.ea),n) )
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return;
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switch ( insn.itype )
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{
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case ST20_ajw:
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op_num(insn.ea, n);
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break;
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}
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}
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//----------------------------------------------------------------------
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ea_t calc_mem(const insn_t &insn, ea_t ea)
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{
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return to_ea(insn.cs, ea);
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}
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//----------------------------------------------------------------------
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void st20_t::handle_operand(const insn_t &insn, const op_t &x, bool isload)
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{
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ea_t ea;
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switch ( x.type )
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{
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case o_imm:
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QASSERT(10110, isload);
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process_immediate_number(insn, x.n);
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if ( op_adds_xrefs(get_flags(insn.ea), x.n) )
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insn.add_off_drefs(x, dr_O, 0);
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break;
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case o_near:
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{
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cref_t ftype = fl_JN;
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ea = calc_mem(insn, x.addr);
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if ( has_insn_feature(insn.itype, CF_CALL) )
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{
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if ( !func_does_return(ea) )
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flow = false;
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ftype = fl_CN;
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}
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insn.add_cref(ea, x.offb, ftype);
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}
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break;
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default:
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INTERR(10376);
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}
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}
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//----------------------------------------------------------------------
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int st20_t::st20_emu(const insn_t &insn)
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{
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uint32 Feature = insn.get_canon_feature(ph);
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flow = ((Feature & CF_STOP) == 0);
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if ( Feature & CF_USE1 ) handle_operand(insn, insn.Op1, true);
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if ( Feature & CF_CHG1 ) handle_operand(insn, insn.Op1, false);
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//
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// Determine if the next instruction should be executed
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//
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if ( segtype(insn.ea) == SEG_XTRN )
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flow = false;
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if ( flow )
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add_cref(insn.ea,insn.ea+insn.size,fl_F);
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return 1;
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}
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//----------------------------------------------------------------------
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int is_jump_func(const func_t * /*pfn*/, ea_t *jump_target)
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{
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*jump_target = BADADDR;
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return 0; // means "don't know"
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}
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//----------------------------------------------------------------------
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int may_be_func(const insn_t &)
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{
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// if ( insn.itype == H8_push && isbp(insn.Op1.reg) ) return 100; // push.l er6
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return 0;
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}
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//----------------------------------------------------------------------
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int is_sane_insn(const insn_t &insn, int /*nocrefs*/)
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{
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if ( insn.itype == ST20_nop )
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{
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for ( int i=0; i < 8; i++ )
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if ( get_word(insn.ea-i*2) != 0 )
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return 1;
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return 0; // too many nops in a row
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}
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return 1;
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}
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//----------------------------------------------------------------------
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int idaapi is_align_insn(ea_t ea)
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{
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insn_t insn;
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if ( decode_insn(&insn, ea) < 1 )
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return 0;
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switch ( insn.itype )
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{
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case ST20_nop:
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break;
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default:
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return 0;
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}
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return insn.size;
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}
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