michael@0: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: // Implement shared vtbl methods.
michael@0: 
michael@0: // Keep this in sync with the darwin version.
michael@0: 
michael@0: #include "xptcprivate.h"
michael@0: #include "xptiprivate.h"
michael@0: 
michael@0: // The Linux/x86-64 ABI passes the first 6 integer parameters and the
michael@0: // first 8 floating point parameters in registers (rdi, rsi, rdx, rcx,
michael@0: // r8, r9 and xmm0-xmm7), no stack space is allocated for these by the
michael@0: // caller.  The rest of the parameters are passed in the callers stack
michael@0: // area.
michael@0: 
michael@0: const uint32_t PARAM_BUFFER_COUNT   = 16;
michael@0: const uint32_t GPR_COUNT            = 6;
michael@0: const uint32_t FPR_COUNT            = 8;
michael@0: 
michael@0: // PrepareAndDispatch() is called by SharedStub() and calls the actual method.
michael@0: //
michael@0: // - 'args[]' contains the arguments passed on stack
michael@0: // - 'gpregs[]' contains the arguments passed in integer registers
michael@0: // - 'fpregs[]' contains the arguments passed in floating point registers
michael@0: // 
michael@0: // The parameters are mapped into an array of type 'nsXPTCMiniVariant'
michael@0: // and then the method gets called.
michael@0: 
michael@0: extern "C" nsresult ATTRIBUTE_USED
michael@0: PrepareAndDispatch(nsXPTCStubBase * self, uint32_t methodIndex,
michael@0:                    uint64_t * args, uint64_t * gpregs, double *fpregs)
michael@0: {
michael@0:     nsXPTCMiniVariant paramBuffer[PARAM_BUFFER_COUNT];
michael@0:     nsXPTCMiniVariant* dispatchParams = nullptr;
michael@0:     const nsXPTMethodInfo* info;
michael@0:     uint32_t paramCount;
michael@0:     uint32_t i;
michael@0:     nsresult result = NS_ERROR_FAILURE;
michael@0: 
michael@0:     NS_ASSERTION(self,"no self");
michael@0: 
michael@0:     self->mEntry->GetMethodInfo(uint16_t(methodIndex), &info);
michael@0:     NS_ASSERTION(info,"no method info");
michael@0:     if (!info)
michael@0:         return NS_ERROR_UNEXPECTED;
michael@0: 
michael@0:     paramCount = info->GetParamCount();
michael@0: 
michael@0:     // setup variant array pointer
michael@0:     if (paramCount > PARAM_BUFFER_COUNT)
michael@0:         dispatchParams = new nsXPTCMiniVariant[paramCount];
michael@0:     else
michael@0:         dispatchParams = paramBuffer;
michael@0: 
michael@0:     NS_ASSERTION(dispatchParams,"no place for params");
michael@0:     if (!dispatchParams)
michael@0:         return NS_ERROR_OUT_OF_MEMORY;
michael@0: 
michael@0:     uint64_t* ap = args;
michael@0:     uint32_t nr_gpr = 1;    // skip one GPR register for 'that'
michael@0:     uint32_t nr_fpr = 0;
michael@0:     uint64_t value;
michael@0: 
michael@0:     for (i = 0; i < paramCount; i++) {
michael@0:         const nsXPTParamInfo& param = info->GetParam(i);
michael@0:         const nsXPTType& type = param.GetType();
michael@0:         nsXPTCMiniVariant* dp = &dispatchParams[i];
michael@0: 	
michael@0:         if (!param.IsOut() && type == nsXPTType::T_DOUBLE) {
michael@0:             if (nr_fpr < FPR_COUNT)
michael@0:                 dp->val.d = fpregs[nr_fpr++];
michael@0:             else
michael@0:                 dp->val.d = *(double*) ap++;
michael@0:             continue;
michael@0:         }
michael@0:         else if (!param.IsOut() && type == nsXPTType::T_FLOAT) {
michael@0:             if (nr_fpr < FPR_COUNT)
michael@0:                 // The value in %xmm register is already prepared to
michael@0:                 // be retrieved as a float. Therefore, we pass the
michael@0:                 // value verbatim, as a double without conversion.
michael@0:                 dp->val.d = fpregs[nr_fpr++];
michael@0:             else
michael@0:                 dp->val.f = *(float*) ap++;
michael@0:             continue;
michael@0:         }
michael@0:         else {
michael@0:             if (nr_gpr < GPR_COUNT)
michael@0:                 value = gpregs[nr_gpr++];
michael@0:             else
michael@0:                 value = *ap++;
michael@0:         }
michael@0: 
michael@0:         if (param.IsOut() || !type.IsArithmetic()) {
michael@0:             dp->val.p = (void*) value;
michael@0:             continue;
michael@0:         }
michael@0: 
michael@0:         switch (type) {
michael@0:         case nsXPTType::T_I8:      dp->val.i8  = (int8_t)   value; break;
michael@0:         case nsXPTType::T_I16:     dp->val.i16 = (int16_t)  value; break;
michael@0:         case nsXPTType::T_I32:     dp->val.i32 = (int32_t)  value; break;
michael@0:         case nsXPTType::T_I64:     dp->val.i64 = (int64_t)  value; break;
michael@0:         case nsXPTType::T_U8:      dp->val.u8  = (uint8_t)  value; break;
michael@0:         case nsXPTType::T_U16:     dp->val.u16 = (uint16_t) value; break;
michael@0:         case nsXPTType::T_U32:     dp->val.u32 = (uint32_t) value; break;
michael@0:         case nsXPTType::T_U64:     dp->val.u64 = (uint64_t) value; break;
michael@0:         // Cast to uint8_t first, to remove garbage on upper 56 bits.
michael@0:         case nsXPTType::T_BOOL:    dp->val.b   = (bool)(uint8_t)   value; break;
michael@0:         case nsXPTType::T_CHAR:    dp->val.c   = (char)     value; break;
michael@0:         case nsXPTType::T_WCHAR:   dp->val.wc  = (wchar_t)  value; break;
michael@0: 
michael@0:         default:
michael@0:             NS_ERROR("bad type");
michael@0:             break;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     result = self->mOuter->CallMethod((uint16_t) methodIndex, info, dispatchParams);
michael@0: 
michael@0:     if (dispatchParams != paramBuffer)
michael@0:         delete [] dispatchParams;
michael@0: 
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: // Linux/x86-64 uses gcc >= 3.1
michael@0: #define STUB_ENTRY(n) \
michael@0: asm(".section	\".text\"\n\t" \
michael@0:     ".align	2\n\t" \
michael@0:     ".if	" #n " < 10\n\t" \
michael@0:     ".globl	_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0:     ".hidden	_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0:     ".type	_ZN14nsXPTCStubBase5Stub" #n "Ev,@function\n" \
michael@0:     "_ZN14nsXPTCStubBase5Stub" #n "Ev:\n\t" \
michael@0:     ".elseif	" #n " < 100\n\t" \
michael@0:     ".globl	_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0:     ".hidden	_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0:     ".type	_ZN14nsXPTCStubBase6Stub" #n "Ev,@function\n" \
michael@0:     "_ZN14nsXPTCStubBase6Stub" #n "Ev:\n\t" \
michael@0:     ".elseif    " #n " < 1000\n\t" \
michael@0:     ".globl     _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0:     ".hidden    _ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0:     ".type      _ZN14nsXPTCStubBase7Stub" #n "Ev,@function\n" \
michael@0:     "_ZN14nsXPTCStubBase7Stub" #n "Ev:\n\t" \
michael@0:     ".else\n\t" \
michael@0:     ".err	\"stub number " #n " >= 1000 not yet supported\"\n\t" \
michael@0:     ".endif\n\t" \
michael@0:     "movl	$" #n ", %eax\n\t" \
michael@0:     "jmp	SharedStub\n\t" \
michael@0:     ".if	" #n " < 10\n\t" \
michael@0:     ".size	_ZN14nsXPTCStubBase5Stub" #n "Ev,.-_ZN14nsXPTCStubBase5Stub" #n "Ev\n\t" \
michael@0:     ".elseif	" #n " < 100\n\t" \
michael@0:     ".size	_ZN14nsXPTCStubBase6Stub" #n "Ev,.-_ZN14nsXPTCStubBase6Stub" #n "Ev\n\t" \
michael@0:     ".else\n\t" \
michael@0:     ".size	_ZN14nsXPTCStubBase7Stub" #n "Ev,.-_ZN14nsXPTCStubBase7Stub" #n "Ev\n\t" \
michael@0:     ".endif");
michael@0: 
michael@0: // static nsresult SharedStub(uint32_t methodIndex)
michael@0: asm(".section   \".text\"\n\t"
michael@0:     ".align     2\n\t"
michael@0:     ".type      SharedStub,@function\n\t"
michael@0:     "SharedStub:\n\t"
michael@0:     // make room for gpregs (48), fpregs (64)
michael@0:     "pushq      %rbp\n\t"
michael@0:     "movq       %rsp,%rbp\n\t"
michael@0:     "subq       $112,%rsp\n\t"
michael@0:     // save GP registers
michael@0:     "movq       %rdi,-112(%rbp)\n\t"
michael@0:     "movq       %rsi,-104(%rbp)\n\t"
michael@0:     "movq       %rdx, -96(%rbp)\n\t"
michael@0:     "movq       %rcx, -88(%rbp)\n\t"
michael@0:     "movq       %r8 , -80(%rbp)\n\t"
michael@0:     "movq       %r9 , -72(%rbp)\n\t"
michael@0:     "leaq       -112(%rbp),%rcx\n\t"
michael@0:     // save FP registers
michael@0:     "movsd      %xmm0,-64(%rbp)\n\t"
michael@0:     "movsd      %xmm1,-56(%rbp)\n\t"
michael@0:     "movsd      %xmm2,-48(%rbp)\n\t"
michael@0:     "movsd      %xmm3,-40(%rbp)\n\t"
michael@0:     "movsd      %xmm4,-32(%rbp)\n\t"
michael@0:     "movsd      %xmm5,-24(%rbp)\n\t"
michael@0:     "movsd      %xmm6,-16(%rbp)\n\t"
michael@0:     "movsd      %xmm7, -8(%rbp)\n\t"
michael@0:     "leaq       -64(%rbp),%r8\n\t"
michael@0:     // rdi has the 'self' pointer already
michael@0:     "movl       %eax,%esi\n\t"
michael@0:     "leaq       16(%rbp),%rdx\n\t"
michael@0:     "call       PrepareAndDispatch@plt\n\t"
michael@0:     "leave\n\t"
michael@0:     "ret\n\t"
michael@0:     ".size      SharedStub,.-SharedStub");
michael@0: 
michael@0: #define SENTINEL_ENTRY(n) \
michael@0: nsresult nsXPTCStubBase::Sentinel##n() \
michael@0: { \
michael@0:     NS_ERROR("nsXPTCStubBase::Sentinel called"); \
michael@0:     return NS_ERROR_NOT_IMPLEMENTED; \
michael@0: }
michael@0: 
michael@0: #include "xptcstubsdef.inc"