зеркало из https://github.com/mozilla/gecko-dev.git
284 строки
13 KiB
C++
284 строки
13 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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// Prior to POWER8, all 64-bit Power ISA systems used ELF v1 ABI, found
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// here:
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// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html
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// and in particular:
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// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-CALL
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// Little-endian ppc64le, however, uses ELF v2 ABI, which is here:
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// http://openpowerfoundation.org/wp-content/uploads/resources/leabi/leabi-20170510.pdf
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// and in particular section 2.2, page 22. However, most big-endian ppc64
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// systems still use ELF v1, so this file should support both.
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//
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// Both ABIs pass the first 8 integral parameters and the first 13 floating
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// point parameters in registers r3-r10 and f1-f13. No stack space is
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// allocated for these by the caller. The rest of the parameters are passed
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// in the caller's stack area. The stack pointer must stay 16-byte aligned.
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const uint32_t PARAM_BUFFER_COUNT = 16;
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const uint32_t GPR_COUNT = 7;
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const uint32_t 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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// - 'gpregs[]' contains the arguments passed in integer registers
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// - 'fpregs[]' 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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//
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// Both ABIs use the same register assignment strategy, as per this
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// example from V1 ABI section 3.2.3 and V2 ABI section 2.2.3.2 [page 43]:
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//
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// typedef struct {
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// int a;
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// double dd;
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// } sparm;
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// sparm s, t;
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// int c, d, e;
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// long double ld;
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// double ff, gg, hh;
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//
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// x = func(c, ff, d, ld, s, gg, t, e, hh);
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//
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// Parameter Register Offset in parameter save area
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// c r3 0-7 (not stored in parameter save area)
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// ff f1 8-15 (not stored)
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// d r5 16-23 (not stored)
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// ld f2,f3 24-39 (not stored)
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// s r8,r9 40-55 (not stored)
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// gg f4 56-63 (not stored)
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// t (none) 64-79 (stored in parameter save area)
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// e (none) 80-87 (stored)
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// hh f5 88-95 (not stored)
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//
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// i.e., each successive FPR usage skips a GPR, but not the other way around.
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extern "C" nsresult ATTRIBUTE_USED
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PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
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uint64_t * args, uint64_t * gpregs, double *fpregs)
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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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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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const uint8_t indexOfJSContext = info->IndexOfJSContext();
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uint64_t* ap = args;
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// |that| is implicit in the calling convention; we really do start at the
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// first GPR (as opposed to x86_64).
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uint32_t nr_gpr = 0;
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uint32_t nr_fpr = 0;
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uint64_t value;
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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 (i == indexOfJSContext) {
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if (nr_gpr < GPR_COUNT)
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nr_gpr++;
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else
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ap++;
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}
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if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
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if (nr_fpr < FPR_COUNT) {
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dp->val.d = fpregs[nr_fpr++];
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nr_gpr++;
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} else {
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dp->val.d = *(double*)ap++;
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}
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continue;
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}
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if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
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if (nr_fpr < FPR_COUNT) {
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// Single-precision floats are passed in FPRs too.
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dp->val.f = (float)fpregs[nr_fpr++];
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nr_gpr++;
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} else {
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#ifdef __LITTLE_ENDIAN__
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dp->val.f = *(float*)ap++;
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#else
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// Big endian needs adjustment to point to the least
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// significant word.
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float* p = (float*)ap;
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p++;
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dp->val.f = *p;
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ap++;
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#endif
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}
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continue;
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}
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if (nr_gpr < GPR_COUNT)
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value = gpregs[nr_gpr++];
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else
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value = *ap++;
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if (param.IsOut() || !type.IsArithmetic()) {
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dp->val.p = (void*) value;
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continue;
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}
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switch (type) {
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case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break;
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case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break;
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case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break;
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case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break;
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case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break;
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case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break;
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case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break;
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case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break;
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case nsXPTType::T_BOOL: dp->val.b = (bool) value; break;
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case nsXPTType::T_CHAR: dp->val.c = (char) value; break;
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case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break;
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default:
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NS_ERROR("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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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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// 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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// 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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// 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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