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/* -*- Mode: C -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "xptcprivate.h"
#include "xptiprivate.h"
/* Under the Mac OS X PowerPC ABI, the first 8 integer and 13 floating point
* parameters are delivered in registers and are not on the stack, although
* stack space is allocated for them. The integer parameters are delivered
* in GPRs r3 through r10. The first 8 words of the parameter area on the
* stack shadow these registers. A word will either be in a register or on
* the stack, but not in both. Although the first floating point parameters
* are passed in floating point registers, GPR space and stack space is
* reserved for them as well.
*
* SharedStub has passed pointers to the parameter section of the stack
* and saved copies of the GPRs and FPRs used for parameter passing. We
* don't care about the first parameter (which is delivered here as the self
* pointer), so SharedStub pointed us past that. argsGPR thus points to GPR
* r4 (corresponding to the first argument after the self pointer) and
* argsStack points to the parameter section of the caller's stack frame
* reserved for the same argument. This way, it is possible to reference
* either argsGPR or argsStack with the same index.
*
* Contrary to the assumption made by the previous implementation, the
* Mac OS X PowerPC ABI doesn't impose any special alignment restrictions on
* parameter sections of stacks. Values that are 64 bits wide appear on the
* stack without any special padding.
*
* See also xptcstubs_asm_ppc_darwin.s.m4:_SharedStub.
*
* ABI reference:
* http://developer.apple.com/documentation/DeveloperTools/Conceptual/
* MachORuntime/PowerPCConventions/chapter_3_section_1.html */
extern "C" nsresult ATTRIBUTE_USED
PrepareAndDispatch(
nsXPTCStubBase *self,
uint32_t methodIndex,
uint32_t *argsStack,
uint32_t *argsGPR,
double *argsFPR) {
#define PARAM_BUFFER_COUNT 16
#define PARAM_FPR_COUNT 13
#define PARAM_GPR_COUNT 7
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
nsXPTCMiniVariant *dispatchParams = nullptr;
const nsXPTMethodInfo *methodInfo;
uint8_t paramCount;
uint8_t i;
nsresult result = NS_ERROR_FAILURE;
uint32_t argIndex = 0;
uint32_t fprIndex = 0;
typedef struct {
uint32_t hi;
uint32_t lo;
} DU;
NS_ASSERTION(self, "no self");
self->mEntry->GetMethodInfo(uint16_t(methodIndex), &methodInfo);
NS_ASSERTION(methodInfo, "no method info");
paramCount = methodInfo->GetParamCount();
if(paramCount > PARAM_BUFFER_COUNT) {
dispatchParams = new nsXPTCMiniVariant[paramCount];
}
else {
dispatchParams = paramBuffer;
}
NS_ASSERTION(dispatchParams,"no place for params");
for(i = 0; i < paramCount; i++, argIndex++) {
const nsXPTParamInfo ¶m = methodInfo->GetParam(i);
const nsXPTType &type = param.GetType();
nsXPTCMiniVariant *dp = &dispatchParams[i];
uint32_t theParam;
if(argIndex < PARAM_GPR_COUNT)
theParam = argsGPR[argIndex];
else
theParam = argsStack[argIndex];
if(param.IsOut() || !type.IsArithmetic())
dp->val.p = (void *) theParam;
else {
switch(type) {
case nsXPTType::T_I8:
dp->val.i8 = (int8_t) theParam;
break;
case nsXPTType::T_I16:
dp->val.i16 = (int16_t) theParam;
break;
case nsXPTType::T_I32:
dp->val.i32 = (int32_t) theParam;
break;
case nsXPTType::T_U8:
dp->val.u8 = (uint8_t) theParam;
break;
case nsXPTType::T_U16:
dp->val.u16 = (uint16_t) theParam;
break;
case nsXPTType::T_U32:
dp->val.u32 = (uint32_t) theParam;
break;
case nsXPTType::T_I64:
case nsXPTType::T_U64:
((DU *)dp)->hi = (uint32_t) theParam;
if(++argIndex < PARAM_GPR_COUNT)
((DU *)dp)->lo = (uint32_t) argsGPR[argIndex];
else
((DU *)dp)->lo = (uint32_t) argsStack[argIndex];
break;
case nsXPTType::T_BOOL:
dp->val.b = (bool) theParam;
break;
case nsXPTType::T_CHAR:
dp->val.c = (char) theParam;
break;
case nsXPTType::T_WCHAR:
dp->val.wc = (wchar_t) theParam;
break;
case nsXPTType::T_FLOAT:
if(fprIndex < PARAM_FPR_COUNT)
dp->val.f = (float) argsFPR[fprIndex++];
else
dp->val.f = *(float *) &argsStack[argIndex];
break;
case nsXPTType::T_DOUBLE:
if(fprIndex < PARAM_FPR_COUNT)
dp->val.d = argsFPR[fprIndex++];
else
dp->val.d = *(double *) &argsStack[argIndex];
argIndex++;
break;
default:
NS_ERROR("bad type");
break;
}
}
}
result = self->mOuter->
CallMethod((uint16_t)methodIndex, methodInfo, dispatchParams);
if(dispatchParams != paramBuffer)
delete [] dispatchParams;
return result;
}
#define STUB_ENTRY(n)
#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
NS_ERROR("nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#include "xptcstubsdef.inc"
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