84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
#define RCSID5 "$Id$"
|
|
|
|
/*
|
|
* Signetics 2650 special routines
|
|
*/
|
|
|
|
#define MASK 0x6000
|
|
#define MASK1 0x1FFF
|
|
#define MASK2 0x1FFE
|
|
|
|
void page(void)
|
|
{
|
|
if(((DOTVAL - 1) & MASK1) == MASK1)
|
|
serror("page violation");
|
|
}
|
|
|
|
void pag2(void)
|
|
{
|
|
if(((DOTVAL - 1) & MASK1) >= MASK2)
|
|
serror("page violation");
|
|
}
|
|
|
|
void rela(expr_t exp,int ind)
|
|
{
|
|
int c, d;
|
|
page();
|
|
if(pass == PASS_3){
|
|
#ifdef ASLD
|
|
if((DOTVAL & MASK) != (exp.val & MASK))
|
|
serror("relative address outside page");
|
|
#endif
|
|
d = low13(DOTVAL);
|
|
c = low13(exp.val);
|
|
#ifdef ASLD
|
|
/*
|
|
* I (Duk Bekema) think the next two if's are meant to
|
|
* handle wrap around, but the original author didn't give
|
|
* any comment here and I don't know anything about the
|
|
* Signetics 2650.
|
|
*/
|
|
if(c - d > 0x1F80)
|
|
d |= 0x2000;
|
|
if(d - c > 0x1F80)
|
|
c |= 0x2000;
|
|
#endif
|
|
c -= d + 1;
|
|
fit(fit7(c));
|
|
}
|
|
#ifdef RELOCATION
|
|
newrelo(exp.typ, RELPC | RELO1);
|
|
#endif
|
|
emit1(low7(c) | ind);
|
|
}
|
|
|
|
void absoa(expr_t exp, int ix, unsigned int ind)
|
|
{
|
|
pag2();
|
|
#ifdef ASLD
|
|
if(pass == PASS_3 && (exp.val & MASK) != (DOTVAL & MASK))
|
|
serror("page violation");
|
|
#endif
|
|
#ifdef RELOCATION
|
|
newrelo(exp.typ, RELO2 | RELBR);
|
|
#endif
|
|
emit2(low13(exp.val) | ind | ix);
|
|
}
|
|
|
|
void absob(expr_t exp, unsigned int ind)
|
|
{
|
|
pag2();
|
|
#ifdef ASLD
|
|
if (exp.val < 0)
|
|
serror("branch to nonexistent memory");
|
|
#endif
|
|
#ifdef RELOCATION
|
|
newrelo(exp.typ, RELO2 | RELBR);
|
|
#endif
|
|
emit2(exp.val | ind);
|
|
}
|