165 lines
4 KiB
C
165 lines
4 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#define RCSID5 "$Id$"
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void settype( int type )
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{ oprtype[ operand ] = type; }
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int twolog(int s)
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{ int twopower = 0;
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while ( (s>>=1) != 0 ) twopower++;
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return( twopower );
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}
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void setmod(int opr)
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{
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mode = modetbl[ twolog( oprtype[opr] ) ] << 12;
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}
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void chtype(int opr, int typerange )
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/* Check type of 'opr' with given 'typerange' and
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** set the global var 'mode'.
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*/
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{ if ( (oprtype[opr] & typerange) != oprtype[opr] ) argerr();
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else /* We have a permitted type for 'opr'. */ setmod( opr );
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}
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void chreg(int opc, int reg)
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{ switch( opc ) {
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case 0xB10A: case 0x1B00: case 0x1900:
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/* R32 expected */ if (reg & 1) regerr(); break;
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case 0xB107: case 0x1A00: case 0x1800:
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/* R64 expected */ if (reg & 3) regerr(); break;
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}
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}
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ATYPE checkaddr( valu_t addr )
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/* Called by functions emit_ad() and branch(). */
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{ ATYPE addr_struct;
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addr_struct.seg = addr >> 16;
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addr_struct.off = addr & 0xFFFF;
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if ( addr_struct.seg < 0 ) addr_struct.seg = 0;
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#ifdef ASLD
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else fit(fit7(addr_struct.seg));
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#endif
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return( addr_struct );
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}
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void emit_ad(expr_t ad_inf)
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/* When the type of an operand is 'da' or 'x' this function
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** emits the address.
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*/
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{ ATYPE addr;
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addr = checkaddr( ad_inf.val );
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/* Always the long format is emitted, because the binary
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** will be downloaded into one z8000-segment with offset
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** 0x0000 upto 0xFFFF,so the chance we can use the short
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** format is very small.
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*/
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emit2( 1<<15 | addr.seg<<8 );
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emit2( addr.off ); /* ??? relocation information ??? */
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}
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void ldmcode(int wrd1,int wrd2, int num)
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{ fit(fit4(num-1));
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emit2( mode | wrd1 );
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emit2( wrd2<<8 | num-1 );
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if ( mode>>12 == 4 ) emit_ad( addr_inf );
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}
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valu_t adjust(valu_t absval)
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{ valu_t val = absval - DOTVAL - 2;
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if ( pass == PASS_2 && val > 0 ) val -= DOTGAIN;
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return( val );
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}
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void branch(int opc,expr_t exp)
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/* This routine determines for the F3 format instructions whether the
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** relative address is small enough to fit in normal code; If this is
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** so normal code is emitted otherwise 'long' code is emitted contai-
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** ning the direct address.
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*/
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{ int longopc = 0, reladdr = 0, sm2, sm4;
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valu_t val;
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ATYPE addr;
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val = adjust(exp.val) >> 1;
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if ( (exp.typ & ~S_DOT) != DOTTYP ) sm2 = sm4 = 0;
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else
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{ switch ( opc & 0xF000 )
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{ case DJNZ_: sm2 = fit7( -val );
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reladdr = -val;
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break;
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case JR_: sm2 = fits8( val );
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reladdr = low8( val );
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longopc = 0x5E00 | (opc>>8 & 0xF);
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break;
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case CALR_: sm2 = fits12( -val );
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reladdr = low12( -val );
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longopc = 0x5F00;
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break;
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}
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sm4 = sm2 || fit8( (int)exp.val );
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}
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switch ( opc & 0xF000 )
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{ case DJNZ_: fit( sm2 ); /* djnz must be short */
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emit2( opc | reladdr );
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break;
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case JR_: case CALR_:
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sm4 = small(sm4, 2);
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sm2 = small(sm2, 2);
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if ( sm2 ) emit2( opc | reladdr );
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else /* replace by jp/call da */
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{ emit2( longopc );
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addr = checkaddr( exp.val );
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if ( sm4 ) /* short-offset */
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emit2( addr.seg<<8 | addr.off );
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else
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{ emit2( 1<<15 | addr.seg<<8 );
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emit2( addr.off );
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}
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}
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}
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}
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void ldrel(int opc,expr_t exp)
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/* This routine determines for the F4 format instructions whether the
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** address is within the same segment (meaning a relative address of
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** less than 16 bits); If this is so normal code is emitted otherwise
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** an error message is given.
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*/
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{ if ( pass >= PASS_2 && (exp.typ & ~S_DOT) != DOTTYP )
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serror( "relative too far" );
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emit2( opc );
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emit2( (int)adjust(exp.val) );
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}
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void shiftcode(int w1, int w2)
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{ switch( w1 & 0x0F04 )
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{ /* Remember: w2 negative means right shift ! */
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case 0x200: /*byte*/ fit( w2>=-8 && w2<=8 ); break;
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case 0x300: /*word*/ fit( w2>=-16 && w2<=16 ); break;
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case 0x304: /*long*/ fit( w2>=-32 && w2<=32 ); break;
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}
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emit2( w1 );
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emit2( w2 );
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}
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void argerr(void)
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{ serror( "illegal operand" ); }
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