/* -*- 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/. */ // Implement shared vtbl methods. // Keep this in sync with the linux version. #include "xptcprivate.h" #include "xptiprivate.h" // The Darwin/x86-64 ABI passes the first 6 integer parameters and the // first 8 floating point parameters in registers (rdi, rsi, rdx, rcx, // r8, r9 and xmm0-xmm7), no stack space is allocated for these by the // caller. The rest of the parameters are passed in the callers stack // area. const uint32_t PARAM_BUFFER_COUNT = 16; const uint32_t GPR_COUNT = 6; const uint32_t FPR_COUNT = 8; // PrepareAndDispatch() is called by SharedStub() and calls the actual method. // // - 'args[]' contains the arguments passed on stack // - 'gpregs[]' contains the arguments passed in integer registers // - 'fpregs[]' contains the arguments passed in floating point registers // // The parameters are mapped into an array of type 'nsXPTCMiniVariant' // and then the method gets called. extern "C" nsresult ATTRIBUTE_USED PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex, uint64_t * args, uint64_t * gpregs, double *fpregs) { nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT]; nsXPTCMiniVariant* dispatchParams = nullptr; const nsXPTMethodInfo* info; uint32_t paramCount; uint32_t i; nsresult result = NS_ERROR_FAILURE; NS_ASSERTION(self,"no self"); self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info); NS_ASSERTION(info,"no method info"); if (!info) return NS_ERROR_UNEXPECTED; paramCount = info->GetParamCount(); // setup variant array pointer if (paramCount > PARAM_BUFFER_COUNT) dispatchParams = new nsXPTCMiniVariant[paramCount]; else dispatchParams = paramBuffer; NS_ASSERTION(dispatchParams,"no place for params"); if (!dispatchParams) return NS_ERROR_OUT_OF_MEMORY; uint64_t* ap = args; uint32_t nr_gpr = 1; // skip one GPR register for 'that' uint32_t nr_fpr = 0; uint64_t value; for (i = 0; i < paramCount; i++) { const nsXPTParamInfo& param = info->GetParam(i); const nsXPTType& type = param.GetType(); nsXPTCMiniVariant* dp = &dispatchParams[i]; if (!param.IsOut() && type == nsXPTType::T_DOUBLE) { if (nr_fpr < FPR_COUNT) dp->val.d = fpregs[nr_fpr++]; else dp->val.d = *(double*) ap++; continue; } else if (!param.IsOut() && type == nsXPTType::T_FLOAT) { if (nr_fpr < FPR_COUNT) // The value in %xmm register is already prepared to // be retrieved as a float. Therefore, we pass the // value verbatim, as a double without conversion. dp->val.d = fpregs[nr_fpr++]; else dp->val.f = *(float*) ap++; continue; } else { if (nr_gpr < GPR_COUNT) value = gpregs[nr_gpr++]; else value = *ap++; } if (param.IsOut() || !type.IsArithmetic()) { dp->val.p = (void*) value; continue; } switch (type) { case nsXPTType::T_I8: dp->val.i8 = (int8_t) value; break; case nsXPTType::T_I16: dp->val.i16 = (int16_t) value; break; case nsXPTType::T_I32: dp->val.i32 = (int32_t) value; break; case nsXPTType::T_I64: dp->val.i64 = (int64_t) value; break; case nsXPTType::T_U8: dp->val.u8 = (uint8_t) value; break; case nsXPTType::T_U16: dp->val.u16 = (uint16_t) value; break; case nsXPTType::T_U32: dp->val.u32 = (uint32_t) value; break; case nsXPTType::T_U64: dp->val.u64 = (uint64_t) value; break; // Cast to uint8_t first, to remove garbage on upper 56 bits. case nsXPTType::T_BOOL: dp->val.b = (bool)(uint8_t) value; break; case nsXPTType::T_CHAR: dp->val.c = (char) value; break; case nsXPTType::T_WCHAR: dp->val.wc = (wchar_t) value; break; default: NS_ERROR("bad type"); break; } } result = self->mOuter->CallMethod((uint16_t) methodIndex, info, dispatchParams); if (dispatchParams != paramBuffer) delete [] dispatchParams; return result; } // Darwin/x86-64 uses gcc >= 4.2 #define STUB_ENTRY(n) \ asm(".section __TEXT,__text\n\t" \ ".align 3\n\t" \ ".if " #n " < 10\n\t" \ ".globl __ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \ "__ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \ ".elseif " #n " < 100\n\t" \ ".globl __ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \ "__ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \ ".elseif " #n " < 1000\n\t" \ ".globl __ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \ "__ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \ ".else\n\t" \ ".err \"stub number " #n " >= 1000 not yet supported\"\n\t" \ ".endif\n\t" \ "movl $" #n ", %eax\n\t" \ "jmp SharedStub\n\t"); // static nsresult SharedStub(uint32_t methodIndex) asm(".section __TEXT,__text\n\t" ".align 3\n\t" "SharedStub:\n\t" // make room for gpregs (48), fpregs (64) "pushq %rbp\n\t" "movq %rsp,%rbp\n\t" "subq $112,%rsp\n\t" // save GP registers "movq %rdi,-112(%rbp)\n\t" "movq %rsi,-104(%rbp)\n\t" "movq %rdx, -96(%rbp)\n\t" "movq %rcx, -88(%rbp)\n\t" "movq %r8 , -80(%rbp)\n\t" "movq %r9 , -72(%rbp)\n\t" "leaq -112(%rbp),%rcx\n\t" // save FP registers "movsd %xmm0,-64(%rbp)\n\t" "movsd %xmm1,-56(%rbp)\n\t" "movsd %xmm2,-48(%rbp)\n\t" "movsd %xmm3,-40(%rbp)\n\t" "movsd %xmm4,-32(%rbp)\n\t" "movsd %xmm5,-24(%rbp)\n\t" "movsd %xmm6,-16(%rbp)\n\t" "movsd %xmm7, -8(%rbp)\n\t" "leaq -64(%rbp),%r8\n\t" // rdi has the 'self' pointer already "movl %eax,%esi\n\t" "leaq 16(%rbp),%rdx\n\t" "call _PrepareAndDispatch\n\t" "leave\n\t" "ret\n\t"); #define SENTINEL_ENTRY(n) \ nsresult nsXPTCStubBase::Sentinel##n() \ { \ NS_ERROR("nsXPTCStubBase::Sentinel called"); \ return NS_ERROR_NOT_IMPLEMENTED; \ } #include "xptcstubsdef.inc"