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