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dabusinessARM64.h
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dabusinessARM64.h
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/*
* dabusinessARM64.h
*
* Ryan Macnak, Eliot Miranda, 7/15
* Updated for aarch64/arm64 by Ken Dickey 26 Dec 2018
*
* Body of the various callIA32XXXReturn functions.
* Call a foreign function according to ARM-ish ABI rules.
* N.B. In Cog Stack and Cogit VMs numArgs is negative to access args from
* the downward-growing stack.
*
* @@Fixme: This file currently assumes compiled on 64 bit machine
* sqInt -> sqLong, et al for 32 bit cross-compile
* @@Fixme: Note that doubles are returned in d0, _NOT_ x0 !
*/
long i;
long size;
long nextReg;
long nextDReg;
long regs[NUM_REG_ARGS];
double dregs[NUM_DREG_ARGS];
sqInt funcAlien;
sqInt resultMaybeAlien;
long argvec;
long argstart;
assert(sizeof(long) == sizeof(void*));
if (numArgs < 0) {
/* Stack or Cog VM. Need to access args downwards from first arg. */
for (i = size = 0; --i >= numArgs;) {
sqInt arg = argVector[i + 1];
if (objIsAlien(arg) && (sizeField(arg) != 0))
/* Direct or indirect Alien. */
size += RoundUpPowerOfTwo(abs(sizeField(arg)), sizeof(long));
else if (interpreterProxy->isFloatObject(arg))
size += sizeof(double);
else
/* Assume an integer or pointer Alien. Check below. */
size += sizeof(long);
}
}
else {
/* Context Interpreter or array version of callout primitive. */
for (i = numArgs, size = 0; --i >= 0;) {
sqInt arg = argVector[i];
if (objIsAlien(arg) && (sizeField(arg) != 0))
/* Direct or indirect Alien. */
size += RoundUpPowerOfTwo(abs(sizeField(arg)), sizeof(long));
else if (interpreterProxy->isFloatObject(arg))
size += sizeof(double);
else
/* Assume an integer or pointer Alien. Check below. */
size += sizeof(long);
}
}
argstart = argvec = (long)alloca(size);
assert(IsAlignedPowerOfTwo(argvec, STACK_ALIGN_BYTES));
nextReg = 0;
nextDReg = 0;
#define MaybePassAsRegArg(expr) \
if (nextReg < NUM_REG_ARGS) \
regs[nextReg++] = expr; \
else { \
*(long*)argvec = expr; \
argvec += sizeof(long); \
}
#define MaybePassAsDRegArg(expr) \
if (nextDReg < NUM_DREG_ARGS) \
dregs[nextDReg++] = expr; \
else { \
argvec = RoundUpPowerOfTwo(argvec, sizeof(double)); \
*(double*) argvec = expr; \
argvec += sizeof(double); \
}
if (numArgs < 0) {
/* Stack or Cog VM. Need to access args downwards from first arg. */
for (i = size = 0; --i >= numArgs;) {
sqInt arg = argVector[i+1];
if (isSmallInt(arg)) {
MaybePassAsRegArg(intVal(arg))
}
else if (objIsAlien(arg)) {
long argByteSize;
if ((size = sizeField(arg)) == 0) /* Pointer Alien. */
size = argByteSize = sizeof(void *);
else /* Direct or indirect Alien. */
argByteSize = abs(size);
/* TODO(rmacnak): Structs larger than word size should be split
* between remaining registers and the stack.
*/
if ((argByteSize <= sizeof(long)) && (nextReg < NUM_REG_ARGS)) {
regs[nextReg++] = *(long*)startOfDataWithSize(arg, size);
}
else {
memcpy((void*)argvec, startOfDataWithSize(arg, size), argByteSize);
argvec += RoundUpPowerOfTwo(argByteSize, sizeof(long));
}
}
else if (objIsUnsafeAlien(arg)) {
sqInt bitsObj = interpreterProxy->fetchPointerofObject(0,arg);
long v = (long)interpreterProxy->firstIndexableField(bitsObj);
MaybePassAsRegArg(v)
}
else if (interpreterProxy->isFloatObject(arg)) {
double d = interpreterProxy->floatValueOf(arg);
MaybePassAsDRegArg(d)
}
else {
long v = interpreterProxy->signed32BitValueOf(arg);
if (interpreterProxy->failed()) {
interpreterProxy->primitiveFailFor(0);
v = interpreterProxy->positive32BitValueOf(arg);
if (interpreterProxy->failed()) {
return PrimErrBadArgument;
}
}
MaybePassAsDRegArg(v)
}
}
}
else {
/* Context Interpreter or array version of callout primitive. */
for (i = 0; i < numArgs; i++) {
sqInt arg = argVector[i];
if (isSmallInt(arg))
MaybePassAsDRegArg(intVal(arg))
else if (objIsAlien(arg)) {
long argByteSize;
if ((size = sizeField(arg)) == 0) /* Pointer Alien. */
size = argByteSize = sizeof(void *);
else /* Direct or indirect Alien. */
argByteSize = abs(size);
/* TODO(rmacnak): Structs larger than word size should be split between
remaining registers and the stack. */
if ((argByteSize <= sizeof(long)) && (nextReg < NUM_REG_ARGS)) {
regs[nextReg++] = *(long*)startOfDataWithSize(arg, size);
}
else {
memcpy((void*)argvec, startOfDataWithSize(arg, size), argByteSize);
argvec += RoundUpPowerOfTwo(argByteSize, sizeof(long));
}
}
else if (objIsUnsafeAlien(arg)) {
sqInt bitsObj = interpreterProxy->fetchPointerofObject(0,arg);
long v = (long)interpreterProxy->firstIndexableField(bitsObj);
MaybePassAsRegArg(v)
}
else if (interpreterProxy->isFloatObject(arg)) {
double d = interpreterProxy->floatValueOf(arg);
MaybePassAsDRegArg(d)
}
else {
long v = interpreterProxy->signed32BitValueOf(arg);
if (interpreterProxy->failed()) {
interpreterProxy->primitiveFailFor(0);
v = interpreterProxy->positive32BitValueOf(arg);
if (interpreterProxy->failed()) {
return PrimErrBadArgument;
}
}
MaybePassAsRegArg(v)
}
}
}
funcAlien = interpreterProxy->stackValue(funcOffset);
f = *(void**)startOfParameterData(funcAlien);
/* Note that this call a) passes the integer reg args in regs in the core
* integer registers, and b) passes the floating point args in dregs in the
* floating-point co-processor registers. Neat.
*/
r = f(regs[0], regs[1], regs[2], regs[3],
dregs[0], dregs[1], dregs[2], dregs[3],
dregs[4], dregs[5], dregs[6], dregs[7]);
/* Post call need to refresh stack pointer in case of call-back and GC. */
resultMaybeAlien = interpreterProxy->stackValue(resultOffset);
if (objIsAlien(resultMaybeAlien)) {
size = sizeField(resultMaybeAlien);
if (size == 0) /* Pointer Alien. */
size = sizeof(long);
memcpy(startOfDataWithSize(resultMaybeAlien, size),
&r,
min((unsigned)abs(size), sizeof(r)));
}
return PrimNoErr;