#ifdef HAVE_ENDIAN_H
#include <endian.h>
#else
-#if !defined(__BORLANDC__) && !defined(_MSC_VER)
+#if !defined(__BORLANDC__) && !defined(_MSC_VER) && !defined(__MINGW32__)
#warning "Cannot determine ENDIANESS of this machine assuming LITTLE_ENDIAN"
#warning "If you running sdcc on an INTEL 80x86 Platform you are okay"
#endif
extern int mcs51_ptrRegReq;
extern int mcs51_nRegs;
extern FILE *codeOutFile;
-static void saverbank (int, iCode *, bool);
+static void saveRBank (int, iCode *, bool);
#define RESULTONSTACK(x) \
(IC_RESULT(x) && IC_RESULT(x)->aop && \
IC_RESULT(x)->aop->type == AOP_STK )
emitcode (char *inst, char *fmt,...)
{
va_list ap;
- char lb[MAX_INLINEASM];
+ char lb[INITIAL_INLINEASM];
char *lbp = lb;
va_start (ap, fmt);
return;
}
- /* if the registers have been saved already then
+ /* if the registers have been saved already or don't need to be then
do nothing */
- if (ic->regsSaved || (OP_SYMBOL (IC_LEFT (ic))->calleeSave))
+ if (ic->regsSaved || (OP_SYMBOL (IC_LEFT (ic))->calleeSave) ||
+ SPEC_NAKED(OP_SYM_ETYPE(IC_LEFT (ic))))
return;
/* find the registers in use at this time
}
detype = getSpec (operandType (IC_LEFT (ic)));
- if (detype &&
- (SPEC_BANK (currFunc->etype) != SPEC_BANK (detype)) &&
- IS_ISR (currFunc->etype) &&
- !ic->bankSaved)
-
- saverbank (SPEC_BANK (detype), ic, TRUE);
}
/*-----------------------------------------------------------------*/
int size, offset = 0;
char *l;
-
/* if this is not a parm push : ie. it is spill push
and spill push is always done on the local stack */
if (!ic->parmPush)
}
/*-----------------------------------------------------------------*/
-/* unsaverbank - restores the resgister bank from stack */
+/* unsaveRBank - restores the resgister bank from stack */
/*-----------------------------------------------------------------*/
static void
-unsaverbank (int bank, iCode * ic, bool popPsw)
+unsaveRBank (int bank, iCode * ic, bool popPsw)
{
int i;
- asmop *aop;
+ asmop *aop = NULL;
regs *r = NULL;
+ if (options.useXstack)
+ {
+ if (!ic)
+ {
+ /* Assume r0 is available for use. */
+ r = mcs51_regWithIdx (R0_IDX);;
+ }
+ else
+ {
+ aop = newAsmop (0);
+ r = getFreePtr (ic, &aop, FALSE);
+ }
+ emitcode ("mov", "%s,_spx", r->name);
+ }
+
if (popPsw)
{
if (options.useXstack)
- {
- aop = newAsmop (0);
- r = getFreePtr (ic, &aop, FALSE);
-
-
- emitcode ("mov", "%s,_spx", r->name);
+ {
emitcode ("movx", "a,@%s", r->name);
emitcode ("mov", "psw,a");
emitcode ("dec", "%s", r->name);
-
}
else
+ {
emitcode ("pop", "psw");
+ }
}
for (i = (mcs51_nRegs - 1); i >= 0; i--)
if (options.useXstack)
{
-
emitcode ("mov", "_spx,%s", r->name);
- freeAsmop (NULL, aop, ic, TRUE);
-
}
+
+ if (aop)
+ {
+ freeAsmop (NULL, aop, ic, TRUE);
+ }
}
/*-----------------------------------------------------------------*/
-/* saverbank - saves an entire register bank on the stack */
+/* saveRBank - saves an entire register bank on the stack */
/*-----------------------------------------------------------------*/
static void
-saverbank (int bank, iCode * ic, bool pushPsw)
+saveRBank (int bank, iCode * ic, bool pushPsw)
{
int i;
- asmop *aop;
+ asmop *aop = NULL;
regs *r = NULL;
if (options.useXstack)
{
-
- aop = newAsmop (0);
- r = getFreePtr (ic, &aop, FALSE);
+ if (!ic)
+ {
+ /* Assume r0 is available for use. */
+ r = mcs51_regWithIdx (R0_IDX);;
+ }
+ else
+ {
+ aop = newAsmop (0);
+ r = getFreePtr (ic, &aop, FALSE);
+ }
emitcode ("mov", "%s,_spx", r->name);
-
}
for (i = 0; i < mcs51_nRegs; i++)
emitcode ("movx", "@%s,a", r->name);
emitcode ("inc", "%s", r->name);
emitcode ("mov", "_spx,%s", r->name);
- freeAsmop (NULL, aop, ic, TRUE);
}
else
+ {
emitcode ("push", "psw");
+ }
emitcode ("mov", "psw,#0x%02x", (bank << 3) & 0x00ff);
}
- ic->bankSaved = 1;
+ if (aop)
+ {
+ freeAsmop (NULL, aop, ic, TRUE);
+ }
+
+ if (ic)
+ {
+ ic->bankSaved = 1;
+ }
}
/*-----------------------------------------------------------------*/
genCall (iCode * ic)
{
sym_link *detype;
-
- /* if caller saves & we have not saved then */
- if (!ic->regsSaved)
- saveRegisters (ic);
-
- /* if we are calling a function that is not using
- the same register bank then we need to save the
- destination registers on the stack */
- detype = getSpec (operandType (IC_LEFT (ic)));
- if (detype &&
- (SPEC_BANK (currFunc->etype) != SPEC_BANK (detype)) &&
- IS_ISR (currFunc->etype) &&
- !ic->bankSaved)
-
- saverbank (SPEC_BANK (detype), ic, TRUE);
+ bool restoreBank = FALSE;
+ bool swapBanks = FALSE;
/* if send set is not empty the assign */
if (_G.sendSet)
}
_G.sendSet = NULL;
}
+
+ /* if we are calling a not _naked function that is not using
+ the same register bank then we need to save the
+ destination registers on the stack */
+ detype = getSpec (operandType (IC_LEFT (ic)));
+ if (detype && !SPEC_NAKED(detype) &&
+ (SPEC_BANK (currFunc->etype) != SPEC_BANK (detype)) &&
+ IS_ISR (currFunc->etype))
+ {
+ if (!ic->bankSaved)
+ {
+ /* This is unexpected; the bank should have been saved in
+ * genFunction.
+ */
+ saveRBank (SPEC_BANK (detype), ic, FALSE);
+ restoreBank = TRUE;
+ }
+ swapBanks = TRUE;
+ }
+
+ /* if caller saves & we have not saved then */
+ if (!ic->regsSaved)
+ saveRegisters (ic);
+
+ if (swapBanks)
+ {
+ emitcode ("mov", "psw,#0x%02x",
+ ((SPEC_BANK(detype)) << 3) & 0xff);
+ }
+
/* make the call */
emitcode ("lcall", "%s", (OP_SYMBOL (IC_LEFT (ic))->rname[0] ?
OP_SYMBOL (IC_LEFT (ic))->rname :
OP_SYMBOL (IC_LEFT (ic))->name));
+ if (swapBanks)
+ {
+ emitcode ("mov", "psw,#0x%02x",
+ ((SPEC_BANK(currFunc->etype)) << 3) & 0xff);
+ }
+
/* if we need assign a result value */
if ((IS_ITEMP (IC_RESULT (ic)) &&
(OP_SYMBOL (IC_RESULT (ic))->nRegs ||
else
for (i = 0; i < ic->parmBytes; i++)
emitcode ("dec", "%s", spname);
-
}
- /* if register bank was saved then pop them */
- if (ic->bankSaved)
- unsaverbank (SPEC_BANK (detype), ic, TRUE);
-
/* if we hade saved some registers then unsave them */
if (ic->regsSaved && !(OP_SYMBOL (IC_LEFT (ic))->calleeSave))
unsaveRegisters (ic);
-
+ /* if register bank was saved then pop them */
+ if (restoreBank)
+ unsaveRBank (SPEC_BANK (detype), ic, FALSE);
}
/*-----------------------------------------------------------------*/
if (detype &&
IS_ISR (currFunc->etype) &&
(SPEC_BANK (currFunc->etype) != SPEC_BANK (detype)))
- saverbank (SPEC_BANK (detype), ic, TRUE);
+ saveRBank (SPEC_BANK (detype), ic, TRUE);
/* push the return address on to the stack */
if (detype &&
(SPEC_BANK (currFunc->etype) !=
SPEC_BANK (detype)))
- unsaverbank (SPEC_BANK (detype), ic, TRUE);
+ unsaveRBank (SPEC_BANK (detype), ic, TRUE);
/* if we hade saved some registers then
unsave them */
{
symbol *sym;
sym_link *fetype;
+ bool switchedPSW = FALSE;
_G.nRegsSaved = 0;
/* create the function header */
emitcode ("", "%s:", sym->rname);
fetype = getSpec (operandType (IC_LEFT (ic)));
+ if (SPEC_NAKED(fetype))
+ {
+ emitcode(";", "naked function: no prologue.");
+ return;
+ }
+
/* if critical function then turn interrupts off */
if (SPEC_CRTCL (fetype))
emitcode ("clr", "ea");
else
{
/* this function has a function call cannot
- determines register usage so we will have the
+ determines register usage so we will have to push the
entire bank */
- saverbank (0, ic, FALSE);
+ saveRBank (0, ic, FALSE);
}
}
+ else
+ {
+ /* This ISR uses a non-zero bank.
+ *
+ * We assume that the bank is available for our
+ * exclusive use.
+ *
+ * However, if this ISR calls a function which uses some
+ * other bank, we must save that bank entirely.
+ */
+ unsigned long banksToSave = 0;
+
+ if (sym->hasFcall)
+ {
+
+#define MAX_REGISTER_BANKS 4
+
+ iCode *i;
+ int ix;
+
+ for (i = ic; i; i = i->next)
+ {
+ if (i->op == ENDFUNCTION)
+ {
+ /* we got to the end OK. */
+ break;
+ }
+
+ if (i->op == CALL)
+ {
+ sym_link *detype;
+
+ detype = getSpec(operandType (IC_LEFT(i)));
+ if (detype
+ && SPEC_BANK(detype) != SPEC_BANK(sym->etype))
+ {
+ /* Mark this bank for saving. */
+ if (SPEC_BANK(detype) >= MAX_REGISTER_BANKS)
+ {
+ werror(E_NO_SUCH_BANK, SPEC_BANK(detype));
+ }
+ else
+ {
+ banksToSave |= (1 << SPEC_BANK(detype));
+ }
+
+ /* And note that we don't need to do it in
+ * genCall.
+ */
+ i->bankSaved = 1;
+ }
+ }
+ if (i->op == PCALL)
+ {
+ /* This is a mess; we have no idea what
+ * register bank the called function might
+ * use.
+ *
+ * The only thing I can think of to do is
+ * throw a warning and hope.
+ */
+ werror(W_FUNCPTR_IN_USING_ISR);
+ }
+ }
+
+ if (banksToSave && options.useXstack)
+ {
+ /* Since we aren't passing it an ic,
+ * saveRBank will assume r0 is available to abuse.
+ *
+ * So switch to our (trashable) bank now, so
+ * the caller's R0 isn't trashed.
+ */
+ emitcode ("push", "psw");
+ emitcode ("mov", "psw,#0x%02x",
+ (SPEC_BANK (sym->etype) << 3) & 0x00ff);
+ switchedPSW = TRUE;
+ }
+
+ for (ix = 0; ix < MAX_REGISTER_BANKS; ix++)
+ {
+ if (banksToSave & (1 << ix))
+ {
+ saveRBank(ix, NULL, FALSE);
+ }
+ }
+ }
+ SPEC_ISR_SAVED_BANKS(currFunc->etype) = banksToSave;
+ }
}
else
{
}
/* set the register bank to the desired value */
- if (SPEC_BANK (sym->etype) || IS_ISR (sym->etype))
+ if ((SPEC_BANK (sym->etype) || IS_ISR (sym->etype))
+ && !switchedPSW)
{
emitcode ("push", "psw");
emitcode ("mov", "psw,#0x%02x", (SPEC_BANK (sym->etype) << 3) & 0x00ff);
{
symbol *sym = OP_SYMBOL (IC_LEFT (ic));
+ if (SPEC_NAKED(sym->etype))
+ {
+ emitcode(";", "naked function: no epilogue.");
+ return;
+ }
+
if (IS_RENT (sym->etype) || options.stackAuto)
{
emitcode ("mov", "%s,_bp", spname);
/* restore the register bank */
if (SPEC_BANK (sym->etype) || IS_ISR (sym->etype))
- emitcode ("pop", "psw");
+ {
+ if (!SPEC_BANK (sym->etype) || !IS_ISR (sym->etype)
+ || !options.useXstack)
+ {
+ /* Special case of ISR using non-zero bank with useXstack
+ * is handled below.
+ */
+ emitcode ("pop", "psw");
+ }
+ }
if (IS_ISR (sym->etype))
{
registers :-) */
if (!SPEC_BANK (sym->etype))
{
-
/* if this function does not call any other
function then we can be economical and
save only those registers that are used */
else
{
/* this function has a function call cannot
- determines register usage so we will have the
+ determines register usage so we will have to pop the
entire bank */
- unsaverbank (0, ic, FALSE);
+ unsaveRBank (0, ic, FALSE);
+ }
+ }
+ else
+ {
+ /* This ISR uses a non-zero bank.
+ *
+ * Restore any register banks saved by genFunction
+ * in reverse order.
+ */
+ unsigned savedBanks = SPEC_ISR_SAVED_BANKS(currFunc->etype);
+ int ix;
+
+ for (ix = MAX_REGISTER_BANKS - 1; ix >= 0; ix--)
+ {
+ if (savedBanks & (1 << ix))
+ {
+ unsaveRBank(ix, NULL, FALSE);
+ }
+ }
+
+ if (options.useXstack)
+ {
+ /* Restore bank AFTER calling unsaveRBank,
+ * since it can trash r0.
+ */
+ emitcode ("pop", "psw");
}
}
emitcode ("setb", "ea");
/* if debug then send end of function */
-/* if (options.debug && currFunc) { */
+/* if (options.debug && currFunc) */
if (currFunc)
{
_G.debugLine = 1;
symbol *lbl;
int size=AOP_SIZE(result);
- //emitcode (";",__FUNCTION__);
if (size<1 || size>2) {
// this should never happen
fprintf (stderr, "size!=1||2 (%d) in %s at line:%d \n",
- AOP_SIZE(result), __FUNCTION__, lineno);
+ AOP_SIZE(result), __FILE__, lineno);
exit (1);
}
//emitcode (";", "signed");
emitcode ("clr", "F0"); // reset sign flag
- emitcode ("mov", "b,%s", aopGet (AOP (right), 0, FALSE, FALSE));
MOVA (aopGet (AOP (left), 0, FALSE, FALSE));
lbl=newiTempLabel(NULL);
emitcode ("inc", "a");
emitcode ("", "%05d$:", lbl->key+100);
- emitcode ("xch", "a,b");
/* if literal */
if (AOP_TYPE(right)==AOP_LIT) {
+ signed char val=floatFromVal (AOP (right)->aopu.aop_lit);
/* AND literal negative */
- if ((int) floatFromVal (AOP (right)->aopu.aop_lit) < 0) {
- // two's complement for literal<0
- emitcode ("xrl", "PSW,#0x20"); // xrl sign flag
- emitcode ("cpl", "a");
- emitcode ("inc", "a");
+ if (val < 0) {
+ emitcode ("cpl", "F0"); // complement sign flag
+ emitcode ("mov", "b,#0x%02x", -val);
+ } else {
+ emitcode ("mov", "b,#0x%02x", val);
}
} else {
lbl=newiTempLabel(NULL);
+ emitcode ("mov", "b,a");
+ emitcode ("mov", "a,%s", aopGet (AOP (right), 0, FALSE, FALSE));
emitcode ("jnb", "acc.7,%05d$", lbl->key+100);
// right side is negative, 8-bit two's complement
- emitcode ("xrl", "PSW,#0x20"); // xrl sign flag
+ emitcode ("cpl", "F0"); // complement sign flag
emitcode ("cpl", "a");
emitcode ("inc", "a");
emitcode ("", "%05d$:", lbl->key+100);
static void
genInline (iCode * ic)
{
- char buffer[MAX_INLINEASM];
- char *bp = buffer;
- char *bp1 = buffer;
+ char *buffer, *bp, *bp1;
_G.inLine += (!options.asmpeep);
+
+ buffer = bp = bp1 = Safe_calloc(1, strlen(IC_INLINE(ic))+1);
strcpy (buffer, IC_INLINE (ic));
/* emit each line as a code */
break;
case 2:
- case 3:
genlshTwo (result, left, shCount);
break;
case 4:
genlshFour (result, left, shCount);
break;
+ default:
+ fprintf(stderr, "*** ack! mystery literal shift!\n");
+ break;
}
}
freeAsmop (left, NULL, ic, TRUE);
shiftRLong (operand * left, int offl,
operand * result, int sign)
{
- if (!sign)
- emitcode ("clr", "c");
+ int isSameRegs=sameRegs(AOP(left),AOP(result));
+
+ if (isSameRegs && offl>1) {
+ // we are in big trouble, but this shouldn't happen
+ werror(E_INTERNAL_ERROR, __FILE__, __LINE__);
+ }
+
MOVA (aopGet (AOP (left), MSB32, FALSE, FALSE));
- if (sign)
+
+ if (offl==MSB16) {
+ // shift is > 8
+ if (sign) {
+ emitcode ("rlc", "a");
+ emitcode ("subb", "a,acc");
+ emitcode ("xch", "a,%s", aopGet(AOP(left), MSB32, FALSE, FALSE));
+ } else {
+ aopPut (AOP(result), zero, MSB32);
+ }
+ }
+
+ if (!sign) {
+ emitcode ("clr", "c");
+ } else {
emitcode ("mov", "c,acc.7");
- emitcode ("rrc", "a");
- aopPut (AOP (result), "a", MSB32 - offl);
- if (offl == MSB16)
- /* add sign of "a" */
- addSign (result, MSB32, sign);
+ }
- MOVA (aopGet (AOP (left), MSB24, FALSE, FALSE));
emitcode ("rrc", "a");
- aopPut (AOP (result), "a", MSB24 - offl);
- MOVA (aopGet (AOP (left), MSB16, FALSE, FALSE));
+ if (isSameRegs && offl==MSB16) {
+ emitcode ("xch", "a,%s",aopGet (AOP (left), MSB24, FALSE, FALSE));
+ } else {
+ aopPut (AOP (result), "a", MSB32);
+ MOVA (aopGet (AOP (left), MSB24, FALSE, FALSE));
+ }
+
+ emitcode ("rrc", "a");
+ if (isSameRegs && offl==1) {
+ emitcode ("xch", "a,%s",aopGet (AOP (left), MSB16, FALSE, FALSE));
+ } else {
+ aopPut (AOP (result), "a", MSB24);
+ MOVA (aopGet (AOP (left), MSB16, FALSE, FALSE));
+ }
emitcode ("rrc", "a");
aopPut (AOP (result), "a", MSB16 - offl);
p_type = DCL_TYPE (type);
else
{
- /* we have to go by the storage class */
- p_type = PTR_TYPE (SPEC_OCLS (etype));
+ if (SPEC_SCLS(etype)==S_REGISTER) {
+ // let's assume it is a generic pointer
+ p_type=GPOINTER;
+ } else {
+ /* we have to go by the storage class */
+ p_type = PTR_TYPE (SPEC_OCLS (etype));
+ }
}
/* the first two bytes are known */
case CPOINTER:
l = "#0x02";
break;
- case PPOINTER:
+ case GPOINTER:
+ l = "0x03";
+ break;
+ case PPOINTER: // what the fck is this?
l = "#0x03";
break;
aopOp (IC_RESULT (ic), ic, FALSE);
- if (IS_AOP_PREG (IC_RESULT (ic)))
+ if (AOP_NEEDSACC(IC_RESULT(ic)))
+ {
+ /* If the result is accessed indirectly via
+ * the accumulator, we must explicitly write
+ * it back after the decrement.
+ */
+ char *rByte = aopGet(AOP(IC_RESULT(ic)), 0, FALSE, FALSE);
+
+ if (strcmp(rByte, "a"))
+ {
+ /* Something is hopelessly wrong */
+ fprintf(stderr, "*** warning: internal error at %s:%d\n",
+ __FILE__, __LINE__);
+ /* We can just give up; the generated code will be inefficient,
+ * but what the hey.
+ */
+ freeAsmop (IC_RESULT (ic), NULL, ic, TRUE);
+ return 0;
+ }
+ emitcode ("dec", "%s", rByte);
+ aopPut(AOP(IC_RESULT(ic)), rByte, 0);
+ emitcode ("jnz", "%05d$", lbl->key + 100);
+ }
+ else if (IS_AOP_PREG (IC_RESULT (ic)))
{
emitcode ("dec", "%s",
aopGet (AOP (IC_RESULT (ic)), 0, FALSE, FALSE));
projects / fw / sdcc / blobdiff