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lc3asm.c
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//-------------------------------------------------------------------
// Copyright (C) 2012 David Welch
//-------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
FILE *fpin;
FILE *fpout;
unsigned int rd,rs,rt,rx;
unsigned int is_const,is_label;
#define ADDMASK 0xFFFF
unsigned int mem[ADDMASK+1];
unsigned int mark[ADDMASK+1];
unsigned int curradd;
unsigned int line;
char cstring[1024];
char newline[1024];
#define LABLEN 64
#define MAX_LABS 65536
struct
{
char name[LABLEN];
unsigned int addr;
unsigned int line;
unsigned int type;
} lab_struct[MAX_LABS];
unsigned int nlabs;
unsigned int lab;
#define NREGNAMES (8)
struct
{
char name[4];
unsigned char num;
} reg_names[NREGNAMES]=
{
{"r0",0},{"r1",1},{"r2",2},{"r3",3},{"r4",4},{"r5",5},{"r6",6},{"r7",7}
};
unsigned char hexchar[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
unsigned char numchar[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//-------------------------------------------------------------------
int rest_of_line ( unsigned int ra )
{
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(newline[ra])
{
printf("<%u> Error: garbage at end of line\n",line);
return(1);
}
return(0);
}
//-------------------------------------------------------------------
int get_reg_number ( char *s, unsigned int *rx )
{
unsigned int ra;
for(ra=0;ra<NREGNAMES;ra++)
{
if(strcmp(s,reg_names[ra].name)==0)
{
*rx=reg_names[ra].num;
return(0);
}
}
return(1);
}
//-------------------------------------------------------------------
unsigned int check_simmed5 ( unsigned int rx )
{
rx&=0xFFFF;
rx>>=4;
if(rx==0) return(0);
if(rx==0x0FFF) return(0);
printf("<%u> Error: invalid signed_immed5\n",line);
return(1);
}
//-------------------------------------------------------------------
unsigned int check_simmed6 ( unsigned int rx )
{
rx&=0xFFFF;
rx>>=5;
if(rx==0) return(0);
if(rx==0x07FF) return(0);
printf("<%u> Error: invalid signed_immed6\n",line);
return(1);
}
//-------------------------------------------------------------------
unsigned int check_offset6 ( unsigned int rx )
{
rx&=0xFFFF;
rx>>=5;
if(rx==0) return(0);
if(rx==0x07FF) return(0);
return(1);
}
//-------------------------------------------------------------------
unsigned int check_offset9 ( unsigned int rx )
{
rx&=0xFFFF;
rx>>=8;
if(rx==0) return(0);
if(rx==0x00FF) return(0);
return(1);
}
//-------------------------------------------------------------------
unsigned int check_offset11 ( unsigned int rx )
{
rx&=0xFFFF;
rx>>=10;
if(rx==0) return(0);
if(rx==0x003F) return(0);
return(1);
}
//-------------------------------------------------------------------
unsigned int parse_immed ( unsigned int ra )
{
unsigned int rb;
if((newline[ra]==0x30)&&((newline[ra+1]=='x')||(newline[ra+1]=='X')))
{
ra+=2;
rb=0;
for(;newline[ra];ra++)
{
if(newline[ra]==0x20) break;
if(!hexchar[newline[ra]])
{
printf("<%u> Error: invalid number\n",line);
return(0);
}
cstring[rb++]=newline[ra];
}
cstring[rb]=0;
if(rb==0)
{
printf("<%u> Error: invalid number\n",line);
return(0);
}
rx=strtoul(cstring,NULL,16);
}
else
{
rb=0;
for(;newline[ra];ra++)
{
if(newline[ra]==0x20) break;
if(!numchar[newline[ra]])
{
printf("<%u> Error: invalid number\n",line);
return(0);
}
cstring[rb++]=newline[ra];
}
cstring[rb]=0;
if(rb==0)
{
printf("<%u> Error: invalid number\n",line);
return(0);
}
rx=strtoul(cstring,NULL,10);
}
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_reg ( unsigned int ra )
{
unsigned int rb;
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
rb=0;
for(;newline[ra];ra++)
{
if(newline[ra]==',') break;
if(newline[ra]==0x20) break;
cstring[rb++]=newline[ra];
}
cstring[rb]=0;
if(get_reg_number(cstring,&rx))
{
printf("<%u> Error: not a register\n",line);
return(0);
}
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_comma ( unsigned int ra )
{
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(newline[ra]!=',')
{
printf("<%u> Error: syntax error\n",line);
return(0);
}
ra++;
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_pound ( unsigned int ra )
{
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(newline[ra]!='#')
{
printf("<%u> Error: syntax error\n",line);
return(0);
}
ra++;
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_three_regs ( unsigned int ra )
{
ra=parse_reg(ra); if(ra==0) return(0);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rs=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rt=rx;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_two_regs ( unsigned int ra )
{
ra=parse_reg(ra); if(ra==0) return(0);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rs=rx;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_three_shift ( unsigned int ra )
{
ra=parse_reg(ra); if(ra==0) return(0);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rt=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rs=rx;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_branch_label ( unsigned int ra )
{
unsigned int rb;
unsigned int rc;
is_const=0;
is_label=0;
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(numchar[newline[ra]])
{
ra=parse_immed(ra); if(ra==0) return(0);
is_const=1;
}
else
{
//assume label, find space or eol.
for(rb=ra;newline[rb];rb++)
{
if(newline[rb]==0x20) break; //no spaces in labels
}
//got a label
rc=rb-ra;
if(rc==0)
{
printf("<%u> Error: Invalid label\n",line);
return(0);
}
rc--;
if(rc>=LABLEN)
{
printf("<%u> Error: Label too long\n",line);
return(0);
}
for(rb=0;rb<=rc;rb++)
{
lab_struct[nlabs].name[rb]=newline[ra++];
}
lab_struct[nlabs].name[rb]=0;
lab_struct[nlabs].addr=curradd;
lab_struct[nlabs].line=line;
lab_struct[nlabs].type=1;
nlabs++;
rx=0;
is_label=1;
}
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_two_label ( unsigned int ra )
{
ra=parse_reg(ra); if(ra==0) return(0);
rt=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_reg(ra); if(ra==0) return(0);
rs=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_branch_label(ra); if(ra==0) return(0);
rd=rx;
return(ra);
}
//-------------------------------------------------------------------
unsigned int parse_one_label ( unsigned int ra )
{
ra=parse_reg(ra); if(ra==0) return(0);
rs=rx;
ra=parse_comma(ra); if(ra==0) return(0);
ra=parse_branch_label(ra); if(ra==0) return(0);
rd=rx;
return(ra);
}
//-------------------------------------------------------------------
//-------------------------------------------------------------------
int assemble ( void )
{
unsigned int ra;
unsigned int rb;
unsigned int rc;
curradd=0;
nlabs=0;
memset(mem,0x00,sizeof(mem));
memset(mark,0x00,sizeof(mark));
line=0;
while(fgets(newline,sizeof(newline)-1,fpin))
{
line++;
//tabs to spaces and other things
for(ra=0;newline[ra];ra++)
{
if(newline[ra]<0x20) newline[ra]=0x20;
if(newline[ra]>=0x7F) newline[ra]=0;
}
//various ways to comment lines
for(ra=0;newline[ra];ra++)
{
if(newline[ra]==';') newline[ra]=0;
if(newline[ra]=='@') newline[ra]=0;
if((newline[ra]=='/')&&(newline[ra+1]=='/')) newline[ra]=0;
if(newline[ra]==0) break;
}
//skip spaces
for(ra=0;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(newline[ra]==0) continue;
//look for a label?
for(rb=ra;newline[rb];rb++)
{
if(newline[rb]==0x20) break; //no spaces in labels
if(newline[rb]==':') break;
}
if(newline[rb]==':')
{
//got a label
rc=rb-ra;
if(rc==0)
{
printf("<%u> Error: Invalid label\n",line);
return(1);
}
rc--;
if(rc>=LABLEN)
{
printf("<%u> Error: Label too long\n",line);
return(1);
}
for(rb=0;rb<=rc;rb++)
{
lab_struct[nlabs].name[rb]=newline[ra++];
}
lab_struct[nlabs].name[rb]=0;
lab_struct[nlabs].addr=0x3000+curradd;
lab_struct[nlabs].line=line;
lab_struct[nlabs].type=0;
ra++;
for(lab=0;lab<nlabs;lab++)
{
if(lab_struct[lab].type) continue;
if(strcmp(lab_struct[lab].name,lab_struct[nlabs].name)==0) break;
}
if(lab<nlabs)
{
printf("<%u> Error: label [%s] already defined on line %u\n",line,lab_struct[lab].name,lab_struct[lab].line);
return(1);
}
nlabs++;
//skip spaces
for(;newline[ra];ra++) if(newline[ra]!=0x20) break;
if(newline[ra]==0) continue;
}
// .word -----------------------------------------------------------
if(strncmp(&newline[ra],".word ",6)==0)
{
ra+=6;
ra=parse_immed(ra); if(ra==0) return(1);
mem[curradd]=rx;
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// add -----------------------------------------------------------
if(strncmp(&newline[ra],"add ",4)==0)
{
ra+=4;
//add rd,rs,rx
//add rd,rs,#imm
ra=parse_two_regs(ra); if(ra==0) return(1);
ra=parse_comma(ra); if(ra==0) return(1);
if(newline[ra]=='#')
{
ra=parse_immed(ra+1); if(ra==0) return(1);
if(check_simmed5(rx)) return(1);
mem[curradd]=0x1020|(rd<<9)|(rs<<6)|(rx&0x1F);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
ra=parse_reg(ra); if(ra==0) return(1);
mem[curradd]=0x1000|(rd<<9)|(rs<<6)|rx;
mark[curradd]|=0x80000000;
curradd++;
}
if(rest_of_line(ra)) return(1);
continue;
}
// and -----------------------------------------------------------
if(strncmp(&newline[ra],"and ",4)==0)
{
ra+=4;
//and rd,rs,rx
//and rd,rs,#imm
ra=parse_two_regs(ra); if(ra==0) return(1);
ra=parse_comma(ra); if(ra==0) return(1);
if(newline[ra]=='#')
{
ra=parse_immed(ra+1); if(ra==0) return(1);
if(check_simmed5(rx)) return(1);
mem[curradd]=0x5020|(rd<<9)|(rs<<6)|(rx&0x1F);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
ra=parse_reg(ra); if(ra==0) return(1);
mem[curradd]=0x5000|(rd<<9)|(rs<<6)|rx;
mark[curradd]|=0x80000000;
curradd++;
}
if(rest_of_line(ra)) return(1);
continue;
}
// jmp -----------------------------------------------------------
if(strncmp(&newline[ra],"jmp ",4)==0)
{
ra+=4;
//jmp rs
ra=parse_reg(ra); if(ra==0) return(1);
mem[curradd]=0xC000|(rx<<6);
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// jsrr -----------------------------------------------------------
if(strncmp(&newline[ra],"jsrr ",5)==0)
{
ra+=5;
//jsrr rs
ra=parse_reg(ra); if(ra==0) return(1);
mem[curradd]=0x4000|(rx<<6);
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// not -----------------------------------------------------------
if(strncmp(&newline[ra],"not ",4)==0)
{
ra+=4;
//not rd,rs
ra=parse_two_regs(ra); if(ra==0) return(1);
mem[curradd]=0x9000|(rd<<9)|(rs<<6);
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// ret -----------------------------------------------------------
if(strncmp(&newline[ra],"ret",3)==0)
{
ra+=3;
//ret
mem[curradd]=0xC1C0;
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// rti -----------------------------------------------------------
if(strncmp(&newline[ra],"rti",3)==0)
{
ra+=3;
//rti
mem[curradd]=0x8000;
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// brn -----------------------------------------------------------
if(strncmp(&newline[ra],"brn ",4)==0)
{
ra+=4;
//brn offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0800|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0800;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brz -----------------------------------------------------------
if(strncmp(&newline[ra],"brz ",4)==0)
{
ra+=4;
//brz offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0400|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0400;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brp -----------------------------------------------------------
if(strncmp(&newline[ra],"brp ",4)==0)
{
ra+=4;
//brp offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0200|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0200;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brnz -----------------------------------------------------------
if(strncmp(&newline[ra],"brnz ",5)==0)
{
ra+=5;
//brnzp offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0C00|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0C00;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brnp -----------------------------------------------------------
if(strncmp(&newline[ra],"brnp ",5)==0)
{
ra+=5;
//brnp offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0A00|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0A00;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brzp -----------------------------------------------------------
if(strncmp(&newline[ra],"brzp ",5)==0)
{
ra+=5;
//brzp offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0600|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0600;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// brnzp -----------------------------------------------------------
if(strncmp(&newline[ra],"brnzp ",6)==0)
{
ra+=6;
//brnzp offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: branch too far\n",line);
return(1);
}
mem[curradd]=0x0E00|(rx&0x1FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x0E00;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// jsr -----------------------------------------------------------
if(strncmp(&newline[ra],"jsr ",4)==0)
{
ra+=4;
//jsr offset/label
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset11(rx))
{
printf("<%u> Error: jsr too far\n",line);
return(1);
}
mem[curradd]=0x4800|(rx&0x07FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x4800;
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// ld -----------------------------------------------------------
if(strncmp(&newline[ra],"ld ",3)==0)
{
ra+=3;
//ld rd,offset/label
ra=parse_reg(ra); if(ra==0) return(1);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: ld too far\n",line);
return(1);
}
mem[curradd]=0x2000|(rd<<9)|(rx&0x01FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x2000|(rd<<9);
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// ldi -----------------------------------------------------------
if(strncmp(&newline[ra],"ldi ",4)==0)
{
ra+=4;
//ldi rd,offset/label
ra=parse_reg(ra); if(ra==0) return(1);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: ldi too far\n",line);
return(1);
}
mem[curradd]=0xA000|(rd<<9)|(rx&0x01FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0xA000|(rd<<9);
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// ldr -----------------------------------------------------------
if(strncmp(&newline[ra],"ldr ",4)==0)
{
ra+=4;
//ldr rd,rs,#offset
ra=parse_two_regs(ra); if(ra==0) return(1);
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_pound(ra); if(ra==0) return(1);
ra=parse_immed(ra); if(ra==0) return(1);
if(rest_of_line(ra)) return(1);
if(check_simmed6(rx)) return(1);
mem[curradd]=0x6000|(rd<<9)|(rs<<6)|(rx&0x003F);
mark[curradd]|=0x80000000;
curradd++;
continue;
}
// lea -----------------------------------------------------------
if(strncmp(&newline[ra],"lea ",4)==0)
{
ra+=4;
//ldi rd,offset/label
ra=parse_reg(ra); if(ra==0) return(1);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: lea too far\n",line);
return(1);
}
mem[curradd]=0xE000|(rd<<9)|(rx&0x01FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0xE000|(rd<<9);
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// st -----------------------------------------------------------
if(strncmp(&newline[ra],"st ",3)==0)
{
ra+=3;
//st rd,offset/label
ra=parse_reg(ra); if(ra==0) return(1);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: st too far\n",line);
return(1);
}
mem[curradd]=0x3000|(rd<<9)|(rx&0x01FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0x3000|(rd<<9);
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// sti -----------------------------------------------------------
if(strncmp(&newline[ra],"sti ",4)==0)
{
ra+=4;
//sti rd,offset/label
ra=parse_reg(ra); if(ra==0) return(1);
rd=rx;
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_branch_label(ra); if(ra==0) return(0);
if(rest_of_line(ra)) return(1);
if(is_const)
{
if(check_offset9(rx))
{
printf("<%u> Error: sti too far\n",line);
return(1);
}
mem[curradd]=0xB000|(rd<<9)|(rx&0x01FF);
mark[curradd]|=0x80000000;
curradd++;
}
else
{
mem[curradd]=0xB000|(rd<<9);
mark[curradd]|=0x80000002;
curradd++;
}
continue;
}
// str -----------------------------------------------------------
if(strncmp(&newline[ra],"str ",4)==0)
{
ra+=4;
//str rd,rs,#offset
ra=parse_two_regs(ra); if(ra==0) return(1);
ra=parse_comma(ra); if(ra==0) return(1);
ra=parse_pound(ra); if(ra==0) return(1);
ra=parse_immed(ra); if(ra==0) return(1);
if(rest_of_line(ra)) return(1);
if(check_simmed6(rx)) return(1);
mem[curradd]=0x7000|(rd<<9)|(rs<<6)|(rx&0x003F);
mark[curradd]|=0x80000000;
curradd++;
continue;
}
// trap -----------------------------------------------------------
if(strncmp(&newline[ra],"trap ",5)==0)
{
ra+=5;
//trap imm
ra=parse_immed(ra); if(ra==0) return(1);
if((rx&0xFF)!=rx)
{
printf("<%u> Error: invalid trap vector\n",line);
return(1);
}
mem[curradd]=0xF000|(rx&0xFF);
mark[curradd]|=0x80000000;
curradd++;
if(rest_of_line(ra)) return(1);
continue;
}
// -----------------------------------------------------------
printf("<%u> Error: syntax error\n",line);
return(1);
}
return(0);
}
//-------------------------------------------------------------------
int main ( int argc, char *argv[] )
{
int ret;
unsigned int ra;
unsigned int rb;
unsigned int inst;
unsigned int inst2;
if(argc!=2)
{
printf("lc3asm filename\n");
return(1);
}
fpin=fopen(argv[1],"rt");