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