mirror of
https://github.com/classilla/tenfourfox.git
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247 lines
11 KiB
C++
247 lines
11 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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// Implement shared vtbl methods.
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#include "xptcprivate.h"
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#include "xptiprivate.h"
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// The Linux/PPC64 ABI passes the first 8 integral
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// parameters and the first 13 floating point parameters in registers
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// (r3-r10 and f1-f13), no stack space is allocated for these by the
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// caller. The rest of the parameters are passed in the caller's stack
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// area. The stack pointer has to retain 16-byte alignment.
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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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#define PARAM_BUFFER_COUNT 16
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#define GPR_COUNT 7
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#define FPR_COUNT 13
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// PrepareAndDispatch() is called by SharedStub() and calls the actual method.
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//
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// - 'args[]' contains the arguments passed on stack
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// - 'gprData[]' contains the arguments passed in integer registers
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// - 'fprData[]' contains the arguments passed in floating point registers
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//
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// The parameters are mapped into an array of type 'nsXPTCMiniVariant'
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// and then the method gets called.
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#include <stdio.h>
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extern "C" nsresult ATTRIBUTE_USED
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PrepareAndDispatch(nsXPTCStubBase* self,
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uint64_t methodIndex,
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uint64_t* args,
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uint64_t *gprData,
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double *fprData)
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{
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nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
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nsXPTCMiniVariant* dispatchParams = nullptr;
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const nsXPTMethodInfo* info;
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uint32_t paramCount;
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uint32_t i;
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nsresult result = NS_ERROR_FAILURE;
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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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if (! info)
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return NS_ERROR_UNEXPECTED;
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paramCount = info->GetParamCount();
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// setup variant array pointer
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if(paramCount > PARAM_BUFFER_COUNT)
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dispatchParams = new nsXPTCMiniVariant[paramCount];
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else
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dispatchParams = paramBuffer;
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NS_ASSERTION(dispatchParams,"no place for params");
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if (! dispatchParams)
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return NS_ERROR_OUT_OF_MEMORY;
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uint64_t* ap = args;
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uint64_t tempu64;
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for(i = 0; i < paramCount; i++) {
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const nsXPTParamInfo& param = info->GetParam(i);
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const nsXPTType& type = param.GetType();
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nsXPTCMiniVariant* dp = &dispatchParams[i];
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if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
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if (i < FPR_COUNT)
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dp->val.d = fprData[i];
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else
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dp->val.d = *(double*) ap;
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} else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
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if (i < FPR_COUNT)
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dp->val.f = (float) fprData[i]; // in registers floats are passed as doubles
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else {
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float *p = (float *)ap;
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#ifndef __LITTLE_ENDIAN__
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p++;
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#endif
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dp->val.f = *p;
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}
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} else { /* integer type or pointer */
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if (i < GPR_COUNT)
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tempu64 = gprData[i];
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else
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tempu64 = *ap;
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if (param.IsOut() || !type.IsArithmetic())
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dp->val.p = (void*) tempu64;
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else if (type == nsXPTType::T_I8)
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dp->val.i8 = (int8_t) tempu64;
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else if (type == nsXPTType::T_I16)
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dp->val.i16 = (int16_t) tempu64;
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else if (type == nsXPTType::T_I32)
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dp->val.i32 = (int32_t) tempu64;
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else if (type == nsXPTType::T_I64)
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dp->val.i64 = (int64_t) tempu64;
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else if (type == nsXPTType::T_U8)
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dp->val.u8 = (uint8_t) tempu64;
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else if (type == nsXPTType::T_U16)
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dp->val.u16 = (uint16_t) tempu64;
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else if (type == nsXPTType::T_U32)
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dp->val.u32 = (uint32_t) tempu64;
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else if (type == nsXPTType::T_U64)
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dp->val.u64 = (uint64_t) tempu64;
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else if (type == nsXPTType::T_BOOL)
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dp->val.b = (bool) tempu64;
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else if (type == nsXPTType::T_CHAR)
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dp->val.c = (char) tempu64;
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else if (type == nsXPTType::T_WCHAR)
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dp->val.wc = (wchar_t) tempu64;
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else
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NS_ERROR("bad type");
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}
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if (i >= 7)
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ap++;
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}
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result = self->mOuter->CallMethod((uint16_t) methodIndex, info,
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dispatchParams);
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if (dispatchParams != paramBuffer)
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delete [] dispatchParams;
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return result;
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}
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// Load r11 with the constant 'n' and branch to SharedStub().
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//
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// XXX Yes, it's ugly that we're relying on gcc's name-mangling here;
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// however, it's quick, dirty, and'll break when the ABI changes on
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// us, which is what we want ;-).
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// gcc-3 version
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//
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// As G++3 ABI contains the length of the functionname in the mangled
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// name, it is difficult to get a generic assembler mechanism like
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// in the G++ 2.95 case.
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// Create names would be like:
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// _ZN14nsXPTCStubBase5Stub1Ev
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// _ZN14nsXPTCStubBase6Stub12Ev
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// _ZN14nsXPTCStubBase7Stub123Ev
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// _ZN14nsXPTCStubBase8Stub1234Ev
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// etc.
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// Use assembler directives to get the names right...
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#if _CALL_ELF == 2
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# define STUB_ENTRY(n) \
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__asm__ ( \
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".section \".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 _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
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".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n" \
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"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
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"0: addis 2,12,.TOC.-0b@ha \n\t" \
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"addi 2,2,.TOC.-0b@l \n\t" \
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".localentry _ZN14nsXPTCStubBase5Stub"#n"Ev,.-_ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
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\
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".elseif "#n" < 100 \n\t" \
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".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
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".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
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"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
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"0: addis 2,12,.TOC.-0b@ha \n\t" \
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"addi 2,2,.TOC.-0b@l \n\t" \
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".localentry _ZN14nsXPTCStubBase6Stub"#n"Ev,.-_ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
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\
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".elseif "#n" < 1000 \n\t" \
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".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
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".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
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"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
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"0: addis 2,12,.TOC.-0b@ha \n\t" \
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"addi 2,2,.TOC.-0b@l \n\t" \
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".localentry _ZN14nsXPTCStubBase7Stub"#n"Ev,.-_ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
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\
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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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\
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"li 11,"#n" \n\t" \
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"b SharedStub \n" \
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);
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#else
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# define STUB_ENTRY(n) \
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__asm__ ( \
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".section \".toc\",\"aw\" \n\t" \
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".section \".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 _ZN14nsXPTCStubBase5Stub"#n"Ev \n\t" \
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".section \".opd\",\"aw\" \n\t" \
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".align 3 \n\t" \
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"_ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
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".quad ._ZN14nsXPTCStubBase5Stub"#n"Ev,.TOC.@tocbase \n\t" \
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".previous \n\t" \
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".type _ZN14nsXPTCStubBase5Stub"#n"Ev,@function \n\n" \
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"._ZN14nsXPTCStubBase5Stub"#n"Ev: \n\t" \
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\
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".elseif "#n" < 100 \n\t" \
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".globl _ZN14nsXPTCStubBase6Stub"#n"Ev \n\t" \
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".section \".opd\",\"aw\" \n\t" \
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".align 3 \n\t" \
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"_ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
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".quad ._ZN14nsXPTCStubBase6Stub"#n"Ev,.TOC.@tocbase \n\t" \
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".previous \n\t" \
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".type _ZN14nsXPTCStubBase6Stub"#n"Ev,@function \n\n" \
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"._ZN14nsXPTCStubBase6Stub"#n"Ev: \n\t" \
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\
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".elseif "#n" < 1000 \n\t" \
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".globl _ZN14nsXPTCStubBase7Stub"#n"Ev \n\t" \
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".section \".opd\",\"aw\" \n\t" \
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".align 3 \n\t" \
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"_ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
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".quad ._ZN14nsXPTCStubBase7Stub"#n"Ev,.TOC.@tocbase \n\t" \
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".previous \n\t" \
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".type _ZN14nsXPTCStubBase7Stub"#n"Ev,@function \n\n" \
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"._ZN14nsXPTCStubBase7Stub"#n"Ev: \n\t" \
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\
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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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\
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"li 11,"#n" \n\t" \
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"b SharedStub \n" \
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);
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#endif
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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_ERROR("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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