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nacl:
add jmp to constant pc. generate HLT for INT $3 do not insert NOPs between REP/REPN and subsequent instruction. allow very long time for convergence. R=ken OCL=34879 CL=34879
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@ -201,6 +201,7 @@ enum
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Zil_rp,
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Zilo_m,
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Zjmp,
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Zjmpcon,
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Zloop,
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Zm_o,
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Zm_r,
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@ -267,7 +267,8 @@ uchar ycall[] =
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uchar yjmp[] =
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{
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Ynone, Yml, Zo_m, 2,
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Ynone, Ybr, Zjmp, 1,
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Ynone, Ybr, Zjmp, 0,
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Ynone, Yi32, Zjmpcon, 1,
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0
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};
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@ -464,7 +464,6 @@ dostkoff(void)
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int a, f, curframe, curbecome, maxbecome;
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Prog *pmorestack;
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Sym *symmorestack;
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static int fsreg;
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pmorestack = P;
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symmorestack = lookup("sys·morestack", 0);
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@ -72,8 +72,9 @@ start:
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if(debug['v'])
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Bprint(&bso, "%5.2f span %d\n", cputime(), n);
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Bflush(&bso);
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if(n > 50) {
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print("span must be looping\n");
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if(n > 500) {
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// TODO(rsc): figure out why nacl takes so long to converge.
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print("span must be looping - %d\n", textsize);
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errorexit();
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}
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c = INITTEXT;
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@ -1045,6 +1046,12 @@ found:
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case Z_ib:
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v = vaddr(&p->to);
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case Zib_:
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if(HEADTYPE == 8 && p->as == AINT && v == 3) {
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// native client disallows all INT instructions.
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// translate INT $3 to HLT.
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*andptr++ = 0xf4;
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break;
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}
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*andptr++ = op;
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*andptr++ = v;
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break;
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@ -1194,6 +1201,15 @@ found:
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}
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break;
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case Zjmpcon:
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v = p->to.offset - p->pc - 5;
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*andptr++ = o->op[z+1];
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*andptr++ = v;
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*andptr++ = v>>8;
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*andptr++ = v>>16;
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*andptr++ = v>>24;
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break;
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case Zloop:
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q = p->pcond;
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if(q) {
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@ -1371,6 +1387,7 @@ asmins(Prog *p)
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{
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if(HEADTYPE == 8) {
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ulong npc;
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static Prog *prefix;
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// native client
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// - pad indirect jump targets (aka ATEXT) to 32-byte boundary
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@ -1386,15 +1403,27 @@ asmins(Prog *p)
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npc = p->pc + (andptr - and);
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p->pc += 31 & -npc;
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}
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if(p->as == AREP || p->as == AREPN) {
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// save prefix for next instruction,
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// so that inserted NOPs do not split (e.g.) REP / MOVSL sequence.
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prefix = p;
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andptr = and;
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return;
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}
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andptr = and;
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if(prefix)
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doasm(prefix);
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doasm(p);
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npc = p->pc + (andptr - and);
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if((p->pc&~31) != ((npc-1)&~31)) {
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if(andptr > and && (p->pc&~31) != ((npc-1)&~31)) {
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// crossed 32-byte boundary; pad to boundary and try again
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p->pc += 31 & -p->pc;
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andptr = and;
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if(prefix)
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doasm(prefix);
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doasm(p);
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}
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prefix = nil;
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} else {
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andptr = and;
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doasm(p);
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