ref: cd747191012d0420ac631340d962da1f80cef0a5
dir: /sys/src/cmd/1l/asm.c/
#include "l.h"
short opa[20];
short *op;
long
entryvalue(void)
{
char *a;
Sym *s;
a = INITENTRY;
if(*a >= '0' && *a <= '9')
return atolwhex(a);
s = lookup(a, 0);
if(s->type == 0)
return INITTEXT;
if(s->type != STEXT)
diag("entry not text: %s", s->name);
return s->value;
}
void
asmb(void)
{
Prog *p;
long v;
int a;
short *op1;
if(debug['v'])
Bprint(&bso, "%5.2f asmb\n", cputime());
Bflush(&bso);
seek(cout, HEADR, 0);
pc = INITTEXT;
curp = firstp;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
if(p->pc != pc) {
if(!debug['a'])
print("%P\n", curp);
diag("phase error %.4lux sb %.4lux in %s", p->pc, pc, TNAME);
pc = p->pc;
}
curp = p;
if(debug['a'])
Bprint(&bso, "%lux:%P\n", pc, curp);
asmins(p);
if(cbc < sizeof(opa))
cflush();
for(op1 = opa; op1 < op; op1++) {
a = *op1;
*cbp++ = a >> 8;
*cbp++ = a;
}
a = 2*(op - opa);
pc += a;
cbc -= a;
if(debug['a']) {
for(op1 = opa; op1 < op; op1++)
if(op1 == opa)
Bprint(&bso, "\t\t%4ux", *op1 & 0xffff);
else
Bprint(&bso, " %4ux", *op1 & 0xffff);
if(op != opa)
Bprint(&bso, "\n");
}
}
cflush();
switch(HEADTYPE) {
case 0: /* this is garbage */
seek(cout, rnd(HEADR+textsize, 8192), 0);
break;
case 1: /* plan9 boot data goes into text */
seek(cout, rnd(HEADR+textsize, INITRND), 0);
break;
case 2: /* plan 9 */
seek(cout, HEADR+textsize, 0);
break;
case 3: /* next boot */
seek(cout, HEADR+rnd(textsize, INITRND), 0);
break;
case 4: /* preprocess pilot */
seek(cout, HEADR+textsize, 0);
break;
}
if(debug['v'])
Bprint(&bso, "%5.2f datblk\n", cputime());
Bflush(&bso);
for(v = 0; v < datsize; v += sizeof(buf)-100) {
if(datsize-v > sizeof(buf)-100)
datblk(v, sizeof(buf)-100);
else
datblk(v, datsize-v);
}
symsize = 0;
spsize = 0;
lcsize = 0;
relocsize = 0;
Bflush(&bso);
switch(HEADTYPE) {
default:
seek(cout, rnd(HEADR+textsize, 8192)+datsize, 0);
break;
case 1: /* plan9 boot data goes into text */
seek(cout, rnd(HEADR+textsize, INITRND)+datsize, 0);
break;
case 2: /* plan 9 */
seek(cout, HEADR+textsize+datsize, 0);
break;
case 3: /* next boot */
seek(cout, HEADR+rnd(textsize, INITRND)+datsize, 0);
break;
case 4: /* preprocess pilot */
seek(cout, HEADR+textsize+datsize, 0);
break;
}
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f sym\n", cputime());
asmsym();
}
Bflush(&bso);
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f sp\n", cputime());
asmsp();
}
Bflush(&bso);
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f pc\n", cputime());
asmlc();
}
Bflush(&bso);
if(!debug['s']) {
if(debug['v'])
Bprint(&bso, "%5.2f reloc\n", cputime());
asmreloc();
}
cflush();
if(debug['v'])
Bprint(&bso, "%5.2f headr\n", cputime());
Bflush(&bso);
seek(cout, 0L, 0);
switch(HEADTYPE) {
default:
lput(0x160L<<16); /* magic and sections */
lput(0L); /* time and date */
lput(rnd(HEADR+textsize, 4096)+datsize);
lput(symsize); /* nsyms */
lput((0x38L<<16)|7L); /* size of optional hdr and flags */
lput((0413<<16)|0437L); /* magic and version */
lput(rnd(HEADR+textsize, 4096)); /* sizes */
lput(datsize);
lput(bsssize);
lput(entryvalue()); /* va of entry */
lput(INITTEXT-HEADR); /* va of base of text */
lput(INITDAT); /* va of base of data */
lput(INITDAT+datsize); /* va of base of bss */
lput(~0L); /* gp reg mask */
lput(0L);
lput(0L);
lput(0L);
lput(0L);
lput(~0L); /* gp value ?? */
break;
case 1: /* plan9 boot data goes into text */
lput(0407); /* magic */
lput(rnd(HEADR+textsize, INITRND)-HEADR+datsize); /* sizes */
lput(0);
lput(bsssize);
lput(symsize); /* nsyms */
lput(entryvalue()); /* va of entry */
lput(spsize); /* sp offsets */
lput(lcsize); /* line offsets */
break;
case 2: /* plan 9 */
lput(0407); /* magic */
lput(textsize); /* sizes */
lput(datsize);
lput(bsssize);
lput(symsize); /* nsyms */
lput(entryvalue()); /* va of entry */
lput(spsize); /* sp offsets */
lput(lcsize); /* line offsets */
break;
case 3: /* next boot */
/* header */
lput(0xfeedfaceL); /* magic */
lput(6); /* 68040 */
lput(1); /* more 68040 */
lput(5); /* file type 'boot' */
lput(HEADTYPE); /* number commands */
lput(HEADR-7*4); /* sizeof commands */
lput(1); /* no undefineds */
/* command 1 text */
lput(1); /* command = 'segment' */
lput(124); /* command size */
s16put("__TEXT");
/* botch?? entryvalue() */
lput(INITTEXT); /* va of start */
lput(rnd(textsize, 8192)); /* va size */
lput(HEADR); /* file offset */
lput(rnd(textsize, 8192)); /* file size */
lput(7); /* max prot */
lput(7); /* init prot */
lput(1); /* number of sections */
lput(0); /* flags */
/* text section */
s16put("__text");
s16put("__TEXT");
/* botch?? entryvalue() */
lput(INITTEXT); /* va of start */
lput(textsize); /* va size */
lput(HEADR); /* file offset */
lput(2); /* align */
lput(0); /* reloff */
lput(0); /* nreloc */
lput(0); /* flags */
lput(0); /* reserved1 */
lput(0); /* reserved2 */
/* command 1 data */
lput(1); /* command = 'segment' */
lput(192); /* command size */
s16put("__DATA");
lput(INITDAT); /* va of start */
lput(rnd(datsize, 8192)); /* va size */
lput(HEADR+rnd(textsize, 8192)); /* file offset */
lput(rnd(datsize, 8192)); /* file size */
lput(7); /* max prot */
lput(7); /* init prot */
lput(2); /* number of sections */
lput(0); /* flags */
/* data section */
s16put("__data");
s16put("__DATA");
lput(INITDAT); /* va of start */
lput(datsize); /* va size */
lput(HEADR+rnd(textsize, 8192)); /* file offset */
lput(2); /* align */
lput(0); /* reloff */
lput(0); /* nreloc */
lput(0); /* flags */
lput(0); /* reserved1 */
lput(0); /* reserved2 */
/* bss section */
s16put("__bss");
s16put("__DATA");
lput(INITDAT+datsize); /* va of start */
lput(bsssize); /* va size */
lput(0); /* file offset */
lput(2); /* align */
lput(0); /* reloff */
lput(0); /* nreloc */
lput(1); /* flags = zero fill */
lput(0); /* reserved1 */
lput(0); /* reserved2 */
/* command 2 symbol */
lput(2); /* command = 'symbol' */
lput(24); /* command size */
lput(HEADR+rnd(textsize, INITRND)
+datsize); /* symoff */
lput(symsize); /* nsyms */
lput(spsize); /* sp offsets */
lput(lcsize); /* line offsets */
break;
case 4: /* preprocess pilot */
lput(0407); /* magic */
lput(textsize); /* sizes */
lput(datsize);
lput(bsssize);
lput(symsize); /* nsyms */
lput(entryvalue()); /* va of entry */
lput(spsize); /* sp offsets */
lput(lcsize); /* line offsets */
lput(relocsize); /* relocation */
break;
}
cflush();
}
void
asmins(Prog *p)
{
Optab *o;
int t, a, b;
long v;
op = opa + 1;
if(special[p->from.type])
switch(p->from.type) {
case D_CCR:
if(p->as != AMOVW)
goto bad;
a = asmea(p, &p->to);
if((a & 0170) == 010)
goto bad;
opa[0] = 0x42c0 | a; /* mov from ccr */
return;
case D_SR:
if(p->as != AMOVW)
goto bad;
a = asmea(p, &p->to);
if((a & 0170) == 010)
goto bad;
opa[0] = 0x40c0 | a; /* mov from sr */
return;
case D_USP:
if(p->as != AMOVL)
goto bad;
a = asmea(p, &p->to);
if((a & 0170) == 010) {
opa[0] = 0x4e68|(a&7); /* mov usp An */
return;
}
t = 0x800;
goto movec1;
case D_SFC:
t = 0x000;
goto movec1;
case D_DFC:
t = 0x001;
goto movec1;
case D_CACR:
t = 0x002;
goto movec1;
case D_TC:
t = 0x003;
goto movec1;
case D_ITT0:
t = 0x004;
goto movec1;
case D_ITT1:
t = 0x005;
goto movec1;
case D_DTT0:
t = 0x006;
goto movec1;
case D_DTT1:
t = 0x007;
goto movec1;
case D_VBR:
t = 0x801;
goto movec1;
case D_CAAR:
t = 0x802;
goto movec1;
case D_MSP:
t = 0x803;
goto movec1;
case D_ISP:
t = 0x804;
goto movec1;
case D_MMUSR:
t = 0x805;
goto movec1;
case D_URP:
t = 0x806;
goto movec1;
case D_SRP:
t = 0x807;
goto movec1;
movec1:
if(p->as != AMOVL)
goto bad;
opa[0] = 0x4e7a; /* mov spc Dn */
a = asmea(p, &p->to);
b = a & 0170;
if(b == 0 || b == 010) {
*op++ = (a<<12) | t;
return;
}
goto bad;
case D_FPCR:
t = 0xb000;
goto movec3;
case D_FPSR:
t = 0xa800;
goto movec3;
case D_FPIAR:
t = 0xa400;
movec3:
if(p->as != AMOVL)
goto bad;
op++;
a = asmea(p, &p->to);
opa[0] = optab[AFMOVEL].opcode0 | a;
opa[1] = t;
return;
}
if(special[p->to.type])
switch(p->to.type) {
case D_CCR:
if(p->as != AMOVW) /* botch, needs and, eor etc. */
goto bad;
a = asmea(p, &p->from);
if((a & 0170) == 010)
goto bad;
opa[0] = 0x44c0 | a; /* mov to ccr */
return;
case D_SR:
if(p->as != AMOVW) /* botch, needs and, eor etc. */
goto bad;
a = asmea(p, &p->from);
if((a & 0170) == 010)
goto bad;
opa[0] = 0x46c0 | a; /* mov to sr */
return;
case D_USP:
if(p->as != AMOVL)
goto bad;
a = asmea(p, &p->from);
if((a & 0170) == 010) {
opa[0] = 0x4e60|(a&7); /* mov An usp */
return;
}
t = 0x800;
goto movec2;
case D_SFC:
t = 0x000;
goto movec2;
case D_DFC:
t = 0x001;
goto movec2;
case D_CACR:
t = 0x002;
goto movec2;
case D_TC:
t = 0x003;
goto movec2;
case D_ITT0:
t = 0x004;
goto movec2;
case D_ITT1:
t = 0x005;
goto movec2;
case D_DTT0:
t = 0x006;
goto movec2;
case D_DTT1:
t = 0x007;
goto movec2;
case D_VBR:
t = 0x801;
goto movec2;
case D_CAAR:
t = 0x802;
goto movec2;
case D_MSP:
t = 0x803;
goto movec2;
case D_ISP:
t = 0x804;
goto movec2;
case D_MMUSR:
t = 0x805;
goto movec2;
case D_URP:
t = 0x806;
goto movec2;
case D_SRP:
t = 0x807;
goto movec2;
movec2:
if(p->as != AMOVL)
goto bad;
opa[0] = 0x4e7b; /* mov Dn spc */
a = asmea(p, &p->from);
b = a & 0170;
if(b == 0 || b == 010) {
*op++ = (a<<12) | t;
return;
}
goto bad;
case D_FPCR:
t = 0x9000;
goto movec4;
case D_FPSR:
t = 0x8800;
goto movec4;
case D_FPIAR:
t = 0x8400;
movec4:
if(p->as != AMOVL)
goto bad;
op++;
a = asmea(p, &p->from);
opa[0] = optab[AFMOVEL].opcode0 | a;
opa[1] = t;
return;
}
o = &optab[p->as];
t = o->opcode0;
switch(o->optype) {
case 0: /* pseudo ops */
if(p->as != ATEXT && p->as != ANOP) {
if(!debug['a'])
print("%P\n", p);
diag("unimplemented instruction in %s", TNAME);
return;
}
op = opa;
return;
case 1: /* branches */
if(p->to.type != D_BRANCH)
goto bad;
a = asmea(p, &p->to);
if(a == 071)
t = o->opcode1;
t |= a;
break;
case 2: /* move */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) == 0110) { /* src quick */
t = o->opcode1;
if((b & 0170) != 0)
goto bad;
t |= a >> 7;
t |= b << 9;
break;
}
t |= a;
t |= (b&7) << 9;
t |= (b&070) << 3;
break;
case 3: /* add */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) == 0110) { /* src quick */
t = o->opcode1;
t |= (a&01600) << 2;
t |= b;
break;
}
if((b & 0170) == 0) { /* dst Dn */
t |= a;
t |= (b & 7) << 9;
break;
}
if((b & 0170) == 010) { /* dst An */
if((t & 0xc0) == 0)
goto bad;
t = o->opcode2;
t |= a;
t |= (b & 7) << 9;
break;
}
if((a & 0170) == 0) { /* src Dn */
t |= 0x100;
t |= (a & 7) << 9;
t |= b;
break;
}
if((a & 0177) == 074) { /* src immed */
t = o->opcode3;
t |= b;
break;
}
goto bad;
case 4: /* no operands */
break;
case 5: /* tst */
t |= asmea(p, &p->to);
if((t&0170) == 010)
goto bad;
break;
case 6: /* lea */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((b & 0170) != 010)
goto bad;
t |= a;
t |= (b & 7) << 9;
break;
case 7: /* cmp */
b = asmea(p, &p->to);
a = asmea(p, &p->from);
if((a & 0170) == 010) { /* dst An */
t = o->opcode1;
if(t == 0) /* cmpb illegal */
goto bad;
t |= 0xc0;
t |= b;
t |= (a & 7) << 9;
break;
}
if((b & 0177) == 074) { /* src immed */
t = o->opcode2;
t |= a;
break;
}
if((a & 0170) == 0) { /* dst Dn */
t |= b;
t |= (a&7) << 9;
break;
}
if((b&0170) == 030 && (a&0170) == 030) { /* (A)+,(A)+ */
t = o->opcode3;
t |= b & 7;
t |= (a & 7) << 9;
break;
}
goto bad;
case 8: /* svc */
*op++ = optab[ARTS].opcode0;
break;
case 9: /* and */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) == 010)
goto bad;
if((b & 0170) == 0) { /* dst Dn */
t |= a;
t |= (b&7) << 9;
break;
}
if((a & 0170) == 0) { /* src Dn */
t = o->opcode1;
t |= b;
t |= (a&7) << 9;
break;
}
if((a & 0177) == 074) { /* src immed */
t = o->opcode2;
t |= b;
break;
}
goto bad;
case 10: /* eor */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) == 010)
goto bad;
if((a & 0170) == 0) { /* src Dn */
t |= b;
t |= (a&7) << 9;
break;
}
if((a & 0177) == 074) { /* src immed */
t = o->opcode1;
t |= b;
break;
}
goto bad;
case 11: /* ext */
b = asmea(p, &p->to);
if((b & 0170) == 0) { /* dst Dn */
t |= b;
break;
}
goto bad;
case 12: /* shift */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((b & 0170) == 0) { /* dst Dn */
if((a & 0177) == 0110) { /* src quick */
t |= (a & 01600) << 2;
t |= b;
break;
}
if((a & 0170) == 0) { /* src Dn */
t |= 0x20;
t |= a << 9;
t |= b;
break;
}
goto bad;
}
goto bad;
case 13: /* mul, div short */
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((b & 0170) == 0) { /* dst Dn */
if((a & 0170) == 010)
goto bad;
t |= a;
t |= b << 9;
break;
}
goto bad;
case 14: /* mul, div long */
*op++ = o->opcode1;
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((b & 0170) == 0) { /* dst Dn */
if((a & 0170) == 010)
goto bad;
t |= a;
opa[1] |= b << 12;
opa[1] |= b+1;
break;
}
goto bad;
case 15: /* dec and branch */
if(p->to.type != D_BRANCH)
goto bad;
v = p->pcond->pc - p->pc - 2;
if(v < -32768L || v >= 32768L)
goto bad;
*op++ = v;
a = asmea(p, &p->from);
if((a & 0170) != 0)
goto bad;
t |= a;
break;
case 16: /* fmove */
*op++ = o->opcode1;
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) == 0100) { /* src Fn */
if((b & 0170) == 0100) { /* both Fn */
opa[1] |= (a&7) << 10;
opa[1] |= (b&7) << 7;
break;
}
t |= b;
opa[1] = o->opcode2;
opa[1] |= (a&7) << 7;
break;
}
if((b & 0170) != 0100) /* dst Fn */
goto bad;
t |= a;
opa[1] = o->opcode3;
opa[1] |= (b&7) << 7;
break;
case 17: /* floating ea,Fn */
*op++ = o->opcode1;
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((b & 0170) != 0100) /* dst Fn */
goto bad;
if((a & 0170) == 0100) { /* both Fn */
opa[1] |= (a&7) << 10;
opa[1] |= (b&7) << 7;
break;
}
t |= a;
opa[1] = o->opcode2;
opa[1] |= (b&7) << 7;
break;
case 18: /* floating branchs */
if(p->to.type != D_BRANCH)
goto bad;
v = p->pcond->pc - p->pc - 2;
if(v < -32768L || v >= 32768L)
goto bad;
*op++ = v;
break;
case 19: /* floating dec and branch */
if(p->to.type != D_BRANCH)
goto bad;
*op++ = o->opcode1;
v = p->pcond->pc - p->pc - 2;
if(v < -32768L || v >= 32768L)
goto bad;
*op++ = v;
a = asmea(p, &p->from);
if((a & 0170) != 0)
goto bad;
t |= a;
break;
case 20: /* ftst ea */
*op++ = o->opcode1;
if(p->from.type != D_NONE)
goto bad;
a = asmea(p, &p->to);
if((a & 0170) == 0100) { /* Fn */
opa[1] |= (a&7) << 10;
break;
}
t |= a;
opa[1] = o->opcode2;
break;
case 21: /* fneg */
*op++ = o->opcode1;
if(p->from.type == D_NONE) {
b = asmea(p, &p->to);
a = b;
} else {
a = asmea(p, &p->from);
b = asmea(p, &p->to);
}
if((b & 0170) != 0100) /* dst Fn */
goto bad;
if((a & 0170) == 0100) { /* both Fn */
opa[1] |= (a&7) << 10;
opa[1] |= (b&7) << 7;
break;
}
t |= a;
opa[1] = o->opcode2;
opa[1] |= (b&7) << 7;
break;
case 22: /* floating cmp Fn,ea */
*op++ = o->opcode1;
a = asmea(p, &p->from);
b = asmea(p, &p->to);
if((a & 0170) != 0100) /* dst Fn */
goto bad;
if((b & 0170) == 0100) { /* both Fn */
opa[1] |= (b&7) << 10;
opa[1] |= (a&7) << 7;
break;
}
t |= b;
opa[1] = o->opcode2;
opa[1] |= (a&7) << 7;
break;
case 23: /* word, long */
op = opa;
a = asmea(p, &p->to);
if(a == ((7<<3)|4))
return;
if(a == ((7<<3)|1)) {
if(p->as == AWORD) {
op = opa;
*op++ = opa[1];
}
return;
}
if(a == ((7<<3)|0)) {
if(p->as == ALONG) {
*op++ = opa[0];
opa[0] = 0;
}
return;
}
goto bad;
case 24: /* bit field */
a = ((p->to.field&31)<<6) | (p->from.field&31);
if(p->as == ABFINS) {
b = asmea(p, &p->from);
if((b&0170) != 0)
goto bad;
a |= b<<12;
*op++ = a;
a = asmea(p, &p->to);
} else {
if(p->to.type != D_NONE) {
b = asmea(p, &p->to);
if((b&0170) != 0)
goto bad;
a |= b<<12;
}
*op++ = a;
a = asmea(p, &p->from);
}
t |= a;
a &= 0170;
if(a == 010 || a == 030 || a == 040 || a == 074)
goto bad;
break;
case 25: /* movem */
if(p->from.type == D_CONST) { /* registers -> memory */
asmea(p, &p->from);
a = asmea(p, &p->to);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 030)
goto bad;
t |= a;
break;
}
if(p->to.type == D_CONST) { /* memory -> registers */
t |= 0x400;
asmea(p, &p->to);
a = asmea(p, &p->from);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 040)
goto bad;
t |= a;
break;
}
goto bad;
case 26: /* chk */
a = asmea(p, &p->from);
if((a&0170) == 010)
goto bad;
b = asmea(p, &p->to);
if((b&0170) != 0)
goto bad;
t |= a;
t |= b<<9;
break;
case 27: /* btst */
a = asmea(p, &p->from);
if(a == 074) {
t = o->opcode1;
} else
if((a&0170) != 0)
goto bad;
b = asmea(p, &p->to);
if(b == 074 || (b&0170) == 010)
goto bad;
t |= b;
break;
case 28: /* fmovem */
if(p->from.type == D_CONST) { /* registers -> memory */
b = p->from.offset & 0xff;
b |= 0xf000; /* control or postinc */
*op++ = b;
a = asmea(p, &p->to);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 030)
goto bad;
if(b == 040)
op[-1] &= ~0x1000; /* predec */
t |= a;
break;
}
if(p->to.type == D_CONST) { /* memory -> registers */
b = p->to.offset & 0xff;
b |= 0xd000; /* control or postinc */
*op++ = b;
a = asmea(p, &p->from);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 040)
goto bad;
t |= a;
break;
}
goto bad;
case 29: /* fmovemc */
if(p->from.type == D_CONST) { /* registers -> memory */
b = (p->from.offset & 0x7) << 10;
b |= 0xa000;
*op++ = b;
a = asmea(p, &p->to);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 030)
goto bad;
t |= a;
break;
}
if(p->to.type == D_CONST) { /* memory -> registers */
b = (p->to.offset & 0x7) << 10;
b |= 0x8000;
*op++ = b;
a = asmea(p, &p->from);
if(a == 074)
goto bad;
b = a & 0170;
if(b == 000 || b == 010 || b == 040)
goto bad;
t |= a;
break;
}
goto bad;
case 30: /* trap */
if(p->to.type == D_CONST) {
t |= p->to.offset & 0xf;
break;
}
goto bad;
case 31: /* chk2, cmp2 */
b = asmea(p, &p->to);
a = b & 0170;
if(a == 000 || a == 010) {
*op++ = o->opcode1 | (b << 12);
t |= asmea(p, &p->from);
break;
}
goto bad;
case 32: /* casew */
/* jmp (0,pc,r0.w*1) */
casepc = p->pc;
*op++ = o->opcode1;
break;
case 34: /* moves */
op++;
a = asmea(p, &p->from);
b = a & 0170;
if(b == 0 || b == 010) {
opa[1] = (a << 12) | 0x800;
b = asmea(p, &p->to);
a = b & 0170;
if(a == 0 || a == 010)
goto bad;
t |= b;
break;
}
t |= a;
b = asmea(p, &p->to);
a = b & 0170;
if(a != 0 && a != 010)
goto bad;
opa[1] = (b << 12);
break;
case 35: /* swap */
a = asmea(p, &p->to);
if((a & 0170) == 0) {
t |= a;
break;
}
goto bad;
}
opa[0] = t;
return;
bad:
if(!debug['a'])
print("%P\n", p);
diag("bad combination of addressing in %s", TNAME);
opa[0] = 0;
}
int
asmea(Prog *p, Adr *a)
{
Optab *o;
int f, t, r, i;
long v;
t = a->type;
r = simple[t];
v = a->offset;
if(r != 0177) {
if(v == 0)
return r;
if((r & 070) != 020)
return r;
if(v >= -32768L && v < 32768L) {
*op++ = v;
return t-D_A0-I_INDIR+050; /* d(Ax) */
}
goto toobig;
}
f = 0;
if(a == &p->from)
f++;
o = &optab[p->as];
switch(t) {
case D_TOS:
if(f) {
if(o->srcsp)
return (3<<3) | 7; /* (A7)+ */
} else
if(o->dstsp)
return (4<<3) | 7; /* -(A7) */
return (2<<3) | 7; /* (A7) */
case D_BRANCH:
v = p->pcond->pc - p->pc - 2;
if(v < -32768L || v >= 32768L) {
if(p->as == ABSR || p->as == ABRA) {
v = p->pcond->pc;
*op++ = v>>16;
*op++ = v;
return (7<<3) | 1;
}
goto toobig;
}
if(v < -128 || v >= 128 || p->mark == 4) {
*op++ = v;
return 0;
}
return v & 0xff;
case I_ADDR|D_STATIC:
case I_ADDR|D_EXTERN:
t = a->sym->type;
if(t == 0 || t == SXREF) {
diag("undefined external: %s in %s",
a->sym->name, TNAME);
a->sym->type = SDATA;
}
v = a->sym->value + a->offset;
if(t != STEXT)
v += INITDAT;
if(strcmp(a->sym->name, "a6base"))
break;
case D_CONST:
switch(f? o->srcsp: o->dstsp) {
case 4:
*op++ = v>>16;
case 2:
*op++ = v;
break;
default:
diag("unknown srcsp asmea in %s", TNAME);
}
return (7<<3) | 4;
case D_FCONST:
r = f? o->srcsp: o->dstsp;
for(i=0; i<r; i++)
((char*)op)[i] = gnuxi(&a->ieee, i, r);
op += r/2;
return (7<<3) | 4;
case D_QUICK:
v = a->offset & 0xff;
return 0110 | (v<<7);
case D_STACK:
case D_AUTO:
case D_PARAM:
if(v == 0)
return (2<<3) | 7; /* (A7) */
if(v >= -32768L && v < 32768L) {
*op++ = v;
return (5<<3) | 7; /* d(A7) */
}
goto toobig;
case I_INDIR|D_CONST:
if(v >= -32768L && v < 32768L) {
*op++ = v;
return (7<<3) | 0;
}
*op++ = v>>16;
*op++ = v;
return (7<<3) | 1;
case D_STATIC:
case D_EXTERN:
t = a->sym->type;
if(t == 0 || t == SXREF) {
diag("undefined external: %s in %s",
a->sym->name, TNAME);
a->sym->type = SDATA;
}
if(t == STEXT) {
if(HEADTYPE == 4) {
v = a->sym->value + a->offset - p->pc - 2;
if(v >= -32768L && v < 32768L) {
*op++ = v;
return (7<<3) | 2;
}
goto toobig;
}
v = a->sym->value + a->offset;
*op++ = v>>16;
*op++ = v;
return (7<<3) | 1;
}
v = a->sym->value + a->offset - A6OFFSET;
if(v < -32768L || v >= 32768L) {
v += INITDAT + A6OFFSET;
if(v >= -32768L && v < 32768L) {
*op++ = v;
return (7<<3) | 0;
}
*op++ = v>>16;
*op++ = v;
return (7<<3) | 1;
}
if(v == 0)
return (2<<3) | 6;
*op++ = v;
return (5<<3) | 6;
}
if(!debug['a'])
print("%P\n", p);
diag("unknown addressing mode: %d in %s", t, TNAME);
return 0;
toobig:
if(!debug['a'])
print("%P\n", p);
diag("addressing mode >> 2^16: %d in %s", t, TNAME);
return 0;
}
void
lput(long l)
{
CPUT(l>>24)
CPUT(l>>16)
CPUT(l>>8)
CPUT(l)
}
void
s16put(char *n)
{
char name[16];
int i;
strncpy(name, n, sizeof(name));
for(i=0; i<sizeof(name); i++)
CPUT(name[i])
}
void
cflush(void)
{
int n;
n = sizeof(buf.cbuf) - cbc;
if(n)
write(cout, buf.cbuf, n);
cbp = buf.cbuf;
cbc = sizeof(buf.cbuf);
}
void
datblk(long s, long n)
{
Prog *p;
char *cast;
long l, fl, j;
int i, c;
memset(buf.dbuf, 0, n+100);
for(p = datap; p != P; p = p->link) {
curp = p;
l = p->from.sym->value + p->from.offset - s;
c = p->from.displace;
i = 0;
if(l < 0) {
if(l+c <= 0)
continue;
while(l < 0) {
l++;
i++;
}
}
if(l >= n)
continue;
for(j=l+(c-i)-1; j>=l; j--)
if(buf.dbuf[j]) {
print("%P\n", p);
diag("multiple initialization");
break;
}
switch(p->to.type) {
case D_FCONST:
switch(c) {
default:
case 4:
fl = ieeedtof(&p->to.ieee);
cast = (char*)&fl;
if(debug['a'] && i == 0) {
Bprint(&bso, "%lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[fnuxi8[j+4]] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = cast[fnuxi8[i+4]];
l++;
}
break;
case 8:
cast = (char*)&p->to.ieee;
if(debug['a'] && i == 0) {
Bprint(&bso, "%lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", cast[fnuxi8[j]] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = cast[fnuxi8[i]];
l++;
}
break;
}
break;
case D_SCONST:
if(debug['a'] && i == 0) {
Bprint(&bso, "%.4lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux", p->to.scon[j] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = p->to.scon[i];
l++;
}
break;
default:
fl = p->to.offset;
if(p->to.sym) {
if(p->to.sym->type == STEXT)
fl += p->to.sym->value;
if(p->to.sym->type == SDATA)
fl += p->to.sym->value + INITDAT;
if(p->to.sym->type == SBSS)
fl += p->to.sym->value + INITDAT;
}
cast = (char*)&fl;
switch(c) {
default:
diag("bad nuxi %d %d\n%P", c, i, curp);
break;
case 1:
if(debug['a'] && i == 0) {
Bprint(&bso, "%.4lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux",cast[inuxi1[j]] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = cast[inuxi1[i]];
l++;
}
break;
case 2:
if(debug['a'] && i == 0) {
Bprint(&bso, "%.4lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux",cast[inuxi2[j]] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = cast[inuxi2[i]];
l++;
}
break;
case 4:
if(debug['a'] && i == 0) {
Bprint(&bso, "%.4lux:%P\n\t\t", l+s+INITDAT, curp);
for(j=0; j<c; j++)
Bprint(&bso, "%.2ux",cast[inuxi4[j]] & 0xff);
Bprint(&bso, "\n");
}
for(; i<c; i++) {
buf.dbuf[l] = cast[inuxi4[i]];
l++;
}
break;
}
break;
}
}
write(cout, buf.dbuf, n);
}
void
asmreloc(void)
{
Prog *p;
Sym *s1, *s2;
int c1, c2, c3;
long v;
if(HEADTYPE != 4)
return;
for(p = datap; p != P; p = p->link) {
curp = p;
s1 = p->to.sym;
if(s1 == S)
continue;
c1 = 'D';
c3 = p->from.displace;
s2 = p->from.sym;
v = s2->value + INITDAT;
switch(s1->type) {
default:
diag("unknown reloc %d", s1->type);
continue;
case STEXT:
c2 = 'T';
break;
case SDATA:
c2 = 'D';
break;
case SBSS:
c2 = 'B';
break;
}
CPUT(c1);
CPUT(c2);
CPUT(c3);
lput(v);
if(debug['a'])
Bprint(&bso, "r %c%c%d %.8lux %s $%s\n",
c1, c2, c3, v, s2->name, s1->name);
relocsize += 7;
}
}
int
gnuxi(Ieee *d, int i, int c)
{
char *p;
long l;
switch(c) {
default:
diag("bad nuxi %d %d\n%P", c, i, curp);
return 0;
/*
* 2301 vax
* 0123 68k
*/
case 4:
l = ieeedtof(d);
p = (char*)&l;
i = gnuxi8[i+4];
break;
/*
* 67452301 vax
* 45670123 68k
*/
case 8:
p = (char*)d;
i = gnuxi8[i];
break;
}
return p[i];
}
long
rnd(long v, long r)
{
long c;
if(r <= 0)
return v;
v += r - 1;
c = v % r;
if(c < 0)
c += r;
v -= c;
return v;
}