98 lines
3.6 KiB
C++
98 lines
3.6 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Platform specific code to invoke XPCOM methods on native objects
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// The purpose of NS_InvokeByIndex() is to map a platform
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// independent call to the platform ABI. To do that,
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// NS_InvokeByIndex() has to determine the method to call via vtable
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// access. The parameters for the method are read from the
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// nsXPTCVariant* and prepared for the native ABI.
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// The PowerPC64 platform ABI can be found here:
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// http://www.freestandards.org/spec/ELF/ppc64/
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// and in particular:
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// http://www.freestandards.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-CALL
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#include <stdio.h>
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#include "xptcprivate.h"
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// 8 integral parameters are passed in registers, not including 'that'
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#define GPR_COUNT 7
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// 8 floating point parameters are passed in registers, floats are
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// promoted to doubles when passed in registers
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#define FPR_COUNT 13
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extern "C" uint32_t
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invoke_count_words(uint32_t paramCount, nsXPTCVariant* s)
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{
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return uint32_t(((paramCount * 2) + 3) & ~3);
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}
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extern "C" void
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invoke_copy_to_stack(uint64_t* gpregs,
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double* fpregs,
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uint32_t paramCount,
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nsXPTCVariant* s,
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uint64_t* d)
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{
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uint64_t tempu64;
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for(uint32_t i = 0; i < paramCount; i++, s++) {
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if(s->IsPtrData())
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tempu64 = (uint64_t) s->ptr;
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else {
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switch(s->type) {
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case nsXPTType::T_FLOAT: break;
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case nsXPTType::T_DOUBLE: break;
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case nsXPTType::T_I8: tempu64 = s->val.i8; break;
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case nsXPTType::T_I16: tempu64 = s->val.i16; break;
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case nsXPTType::T_I32: tempu64 = s->val.i32; break;
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case nsXPTType::T_I64: tempu64 = s->val.i64; break;
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case nsXPTType::T_U8: tempu64 = s->val.u8; break;
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case nsXPTType::T_U16: tempu64 = s->val.u16; break;
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case nsXPTType::T_U32: tempu64 = s->val.u32; break;
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case nsXPTType::T_U64: tempu64 = s->val.u64; break;
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case nsXPTType::T_BOOL: tempu64 = s->val.b; break;
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case nsXPTType::T_CHAR: tempu64 = s->val.c; break;
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case nsXPTType::T_WCHAR: tempu64 = s->val.wc; break;
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default: tempu64 = (uint64_t) s->val.p; break;
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}
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}
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if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
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if (i < FPR_COUNT)
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fpregs[i] = s->val.d;
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else
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*(double *)d = s->val.d;
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}
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else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
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if (i < FPR_COUNT) {
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fpregs[i] = s->val.f; // if passed in registers, floats are promoted to doubles
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} else {
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float *p = (float *)d;
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#ifndef __LITTLE_ENDIAN__
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p++;
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#endif
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*p = s->val.f;
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}
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}
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else {
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if (i < GPR_COUNT)
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gpregs[i] = tempu64;
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else
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*d = tempu64;
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}
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if (i >= 7)
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d++;
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}
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}
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EXPORT_XPCOM_API(nsresult)
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NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
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uint32_t paramCount, nsXPTCVariant* params);
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