141 lines
4.8 KiB
C++
141 lines
4.8 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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#include "xptcprivate.h"
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#if !defined(_MSC_VER) && !defined(_M_ARM64)
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#error "This code is for AArch64 Windows only"
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#endif
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/* "Procedure Call Standard for the ARM 64-bit Architecture" document, sections
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* "5.4 Parameter Passing" and "6.1.2 Procedure Calling" contain all the
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* needed information.
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*
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* http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
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*
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* Windows follows this document, see:
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*
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* https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions
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*/
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/*
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* Allocation of integer function arguments initially to registers r1-r7
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* and then to stack. Handling of 'that' argument which goes to register r0
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* is handled separately and does not belong here.
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*
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* 'ireg_args' - pointer to the current position in the buffer,
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* corresponding to the register arguments
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* 'stack_args' - pointer to the current position in the buffer,
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* corresponding to the arguments on stack
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* 'end' - pointer to the end of the registers argument
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* buffer.
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*/
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static inline void alloc_word(uint64_t* &ireg_args,
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uint64_t* &stack_args,
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uint64_t* end,
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uint64_t data)
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{
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if (ireg_args < end) {
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*ireg_args = data;
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ireg_args++;
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} else {
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*stack_args = data;
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stack_args++;
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}
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}
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static inline void alloc_double(double* &freg_args,
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uint64_t* &stack_args,
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double* end,
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double data)
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{
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if (freg_args < end) {
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*freg_args = data;
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freg_args++;
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} else {
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memcpy(stack_args, &data, sizeof(data));
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stack_args++;
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}
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}
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static inline void alloc_float(double* &freg_args,
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uint64_t* &stack_args,
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double* end,
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float data)
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{
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if (freg_args < end) {
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memcpy(freg_args, &data, sizeof(data));
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freg_args++;
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} else {
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memcpy(stack_args, &data, sizeof(data));
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stack_args++;
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}
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}
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extern "C" void
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invoke_copy_to_stack(uint64_t* stk, uint64_t *end,
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uint32_t paramCount, nsXPTCVariant* s)
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{
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uint64_t *ireg_args = stk;
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uint64_t *ireg_end = ireg_args + 8;
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double *freg_args = (double *)ireg_end;
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double *freg_end = freg_args + 8;
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uint64_t *stack_args = (uint64_t *)freg_end;
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// leave room for 'that' argument in x0
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++ireg_args;
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for (uint32_t i = 0; i < paramCount; i++, s++) {
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uint64_t word;
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if (s->IsIndirect()) {
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word = (uint64_t)&s->val;
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} else {
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// According to the ABI, integral types that are smaller than 8
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// bytes are to be passed in 8-byte registers or 8-byte stack
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// slots.
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switch (s->type) {
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case nsXPTType::T_FLOAT:
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alloc_float(freg_args, stack_args, freg_end, s->val.f);
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continue;
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case nsXPTType::T_DOUBLE:
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alloc_double(freg_args, stack_args, freg_end, s->val.d);
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continue;
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case nsXPTType::T_I8: word = s->val.i8; break;
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case nsXPTType::T_I16: word = s->val.i16; break;
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case nsXPTType::T_I32: word = s->val.i32; break;
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case nsXPTType::T_I64: word = s->val.i64; break;
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case nsXPTType::T_U8: word = s->val.u8; break;
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case nsXPTType::T_U16: word = s->val.u16; break;
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case nsXPTType::T_U32: word = s->val.u32; break;
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case nsXPTType::T_U64: word = s->val.u64; break;
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case nsXPTType::T_BOOL: word = s->val.b; break;
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case nsXPTType::T_CHAR: word = s->val.c; break;
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case nsXPTType::T_WCHAR: word = s->val.wc; break;
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default:
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// all the others are plain pointer types
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word = reinterpret_cast<uint64_t>(s->val.p);
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break;
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}
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}
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alloc_word(ireg_args, stack_args, ireg_end, word);
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}
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}
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extern "C" nsresult
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XPTC__InvokebyIndex(nsISupports* that, uint32_t methodIndex,
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uint32_t paramCount, nsXPTCVariant* params);
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extern "C"
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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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{
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return XPTC__InvokebyIndex(that, methodIndex, paramCount, params);
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}
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