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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/. */
#include "xptcprivate.h"
#ifndef __AARCH64EL__
#error "Only little endian compatibility was tested"
#endif
template<typename T> void
get_value_and_advance(T* aOutValue, void*& aStack) {
#ifdef __APPLE__
const size_t aligned_size = sizeof(T);
#else
const size_t aligned_size = 8;
#endif
// Ensure the pointer is aligned for the type
uintptr_t addr = (reinterpret_cast<uintptr_t>(aStack) + aligned_size - 1) & ~(aligned_size - 1);
memcpy(aOutValue, reinterpret_cast<void*>(addr), sizeof(T));
aStack = reinterpret_cast<void*>(addr + aligned_size);
}
/*
* This is for AArch64 ABI
*
* When we're called, the "gp" registers are stored in gprData and
* the "fp" registers are stored in fprData. Each array has 8 regs
* but first reg in gprData is a placeholder for 'self'.
*/
extern "C" nsresult ATTRIBUTE_USED
PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, void* args,
uint64_t *gprData, double *fprData)
{
#define PARAM_GPR_COUNT 8
#define PARAM_FPR_COUNT 8
nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
const nsXPTMethodInfo* info;
NS_ASSERTION(self,"no self");
self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
NS_ASSERTION(info,"no method info");
uint32_t paramCount = info->GetParamCount();
const uint8_t indexOfJSContext = info->IndexOfJSContext();
void* ap = args;
uint32_t next_gpr = 1; // skip first arg which is 'self'
uint32_t next_fpr = 0;
for (uint32_t i = 0; i < paramCount; i++) {
const nsXPTParamInfo& param = info->GetParam(i);
const nsXPTType& type = param.GetType();
nsXPTCMiniVariant* dp = ¶mBuffer[i];
if (i == indexOfJSContext) {
if (next_gpr < PARAM_GPR_COUNT)
next_gpr++;
else {
void* value;
get_value_and_advance(&value, ap);
}
}
if (param.IsOut() || !type.IsArithmetic()) {
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.p = (void*)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.p, ap);
}
continue;
}
switch (type) {
case nsXPTType::T_I8:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.i8 = (int8_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.i8, ap);
}
break;
case nsXPTType::T_I16:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.i16 = (int16_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.i16, ap);
}
break;
case nsXPTType::T_I32:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.i32 = (int32_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.i32, ap);
}
break;
case nsXPTType::T_I64:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.i64 = (int64_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.i64, ap);
}
break;
case nsXPTType::T_U8:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.u8 = (uint8_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.u8, ap);
}
break;
case nsXPTType::T_U16:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.u16 = (uint16_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.u16, ap);
}
break;
case nsXPTType::T_U32:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.u32 = (uint32_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.u32, ap);
}
break;
case nsXPTType::T_U64:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.u64 = (uint64_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.u64, ap);
}
break;
case nsXPTType::T_FLOAT:
if (next_fpr < PARAM_FPR_COUNT) {
memcpy(&dp->val.f, &fprData[next_fpr++], sizeof(dp->val.f));
} else {
get_value_and_advance(&dp->val.f, ap);
}
break;
case nsXPTType::T_DOUBLE:
if (next_fpr < PARAM_FPR_COUNT) {
memcpy(&dp->val.d, &fprData[next_fpr++], sizeof(dp->val.d));
} else {
get_value_and_advance(&dp->val.d, ap);
}
break;
case nsXPTType::T_BOOL:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.b = (bool)(uint8_t)gprData[next_gpr++];
} else {
uint8_t value;
get_value_and_advance(&value, ap);
dp->val.b = (bool)value;
}
break;
case nsXPTType::T_CHAR:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.c = (char)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.c, ap);
}
break;
case nsXPTType::T_WCHAR:
if (next_gpr < PARAM_GPR_COUNT) {
dp->val.wc = (wchar_t)gprData[next_gpr++];
} else {
get_value_and_advance(&dp->val.wc, ap);
}
break;
default:
NS_ASSERTION(0, "bad type");
break;
}
}
nsresult result = self->mOuter->CallMethod((uint16_t)methodIndex, info,
paramBuffer);
return result;
}
#ifdef __APPLE__
#define GNU(str)
#define UNDERSCORE "__"
#else
#define GNU(str) str
#define UNDERSCORE "_"
#endif
// Load w17 with the constant 'n' and branch to SharedStub().
# define STUB_ENTRY(n) \
__asm__ ( \
".text\n\t" \
".align 2\n\t" \
".if "#n" < 10 \n\t" \
".globl " UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
GNU(".hidden _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t") \
GNU(".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n")\
"" UNDERSCORE "ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
".elseif "#n" < 100 \n\t" \
".globl " UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
GNU(".hidden _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t") \
GNU(".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n")\
"" UNDERSCORE "ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
".elseif "#n" < 1000 \n\t" \
".globl " UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
GNU(".hidden _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t") \
GNU(".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n")\
UNDERSCORE "ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
".else \n\t" \
".err \"stub number "#n" >= 1000 not yet supported\"\n" \
".endif \n\t" \
"mov w17,#"#n" \n\t" \
"b SharedStub \n" \
);
#define SENTINEL_ENTRY(n) \
nsresult nsXPTCStubBase::Sentinel##n() \
{ \
NS_ASSERTION(0,"nsXPTCStubBase::Sentinel called"); \
return NS_ERROR_NOT_IMPLEMENTED; \
}
#include "xptcstubsdef.inc"
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