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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
// Platform specific code to invoke XPCOM methods on native objects
// The purpose of NS_InvokeByIndex() is to map a platform
// independent call to the platform ABI. To do that,
// NS_InvokeByIndex() has to determine the method to call via vtable
// access. The parameters for the method are read from the
// nsXPTCVariant* and prepared for the native ABI.
// The PowerPC64 platform ABI can be found here:
// http://www.freestandards.org/spec/ELF/ppc64/
// and in particular:
// http://www.freestandards.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-CALL
#include <stdio.h>
#include "xptcprivate.h"
// 8 integral parameters are passed in registers, not including 'that'
#define GPR_COUNT 7
// 8 floating point parameters are passed in registers, floats are
// promoted to doubles when passed in registers
#define FPR_COUNT 13
extern "C" uint32_t
invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
{
return uint32_t(((paramCount * 2) + 3) & ~3);
}
extern "C" void
invoke_copy_to_stack(uint64_t* gpregs,
double* fpregs,
uint32_t paramCount,
nsXPTCVariant* s,
uint64_t* d)
{
uint64_t tempu64;
for(uint32_t i = 0; i < paramCount; i++, s++) {
if(s->IsPtrData())
tempu64 = (uint64_t) s->ptr;
else {
switch(s->type) {
case nsXPTType::T_FLOAT: break;
case nsXPTType::T_DOUBLE: break;
case nsXPTType::T_I8: tempu64 = s->val.i8; break;
case nsXPTType::T_I16: tempu64 = s->val.i16; break;
case nsXPTType::T_I32: tempu64 = s->val.i32; break;
case nsXPTType::T_I64: tempu64 = s->val.i64; break;
case nsXPTType::T_U8: tempu64 = s->val.u8; break;
case nsXPTType::T_U16: tempu64 = s->val.u16; break;
case nsXPTType::T_U32: tempu64 = s->val.u32; break;
case nsXPTType::T_U64: tempu64 = s->val.u64; break;
case nsXPTType::T_BOOL: tempu64 = s->val.b; break;
case nsXPTType::T_CHAR: tempu64 = s->val.c; break;
case nsXPTType::T_WCHAR: tempu64 = s->val.wc; break;
default: tempu64 = (uint64_t) s->val.p; break;
}
}
if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
if (i < FPR_COUNT)
fpregs[i] = s->val.d;
else
*(double *)d = s->val.d;
}
else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
if (i < FPR_COUNT) {
fpregs[i] = s->val.f; // if passed in registers, floats are promoted to doubles
} else {
float *p = (float *)d;
#ifndef __LITTLE_ENDIAN__
p++;
#endif
*p = s->val.f;
}
}
else {
if (i < GPR_COUNT)
gpregs[i] = tempu64;
else
*d = tempu64;
}
if (i >= 7)
d++;
}
}
EXPORT_XPCOM_API(nsresult)
NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
uint32_t paramCount, nsXPTCVariant* params);
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