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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if defined(V8_TARGET_ARCH_X64)
#include "codegen.h"
namespace v8 {
namespace internal {
// -------------------------------------------------------------------------
// Platform-specific RuntimeCallHelper functions.
void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
masm->EnterInternalFrame();
}
void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
masm->LeaveInternalFrame();
}
#define __ masm.
#ifdef _WIN64
typedef double (*ModuloFunction)(double, double);
// Define custom fmod implementation.
ModuloFunction CreateModuloFunction() {
size_t actual_size;
byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
&actual_size,
true));
CHECK(buffer);
Assembler masm(NULL, buffer, static_cast<int>(actual_size));
// Generated code is put into a fixed, unmovable, buffer, and not into
// the V8 heap. We can't, and don't, refer to any relocatable addresses
// (e.g. the JavaScript nan-object).
// Windows 64 ABI passes double arguments in xmm0, xmm1 and
// returns result in xmm0.
// Argument backing space is allocated on the stack above
// the return address.
// Compute x mod y.
// Load y and x (use argument backing store as temporary storage).
__ movsd(Operand(rsp, kPointerSize * 2), xmm1);
__ movsd(Operand(rsp, kPointerSize), xmm0);
__ fld_d(Operand(rsp, kPointerSize * 2));
__ fld_d(Operand(rsp, kPointerSize));
// Clear exception flags before operation.
{
Label no_exceptions;
__ fwait();
__ fnstsw_ax();
// Clear if Illegal Operand or Zero Division exceptions are set.
__ testb(rax, Immediate(5));
__ j(zero, &no_exceptions);
__ fnclex();
__ bind(&no_exceptions);
}
// Compute st(0) % st(1)
{
Label partial_remainder_loop;
__ bind(&partial_remainder_loop);
__ fprem();
__ fwait();
__ fnstsw_ax();
__ testl(rax, Immediate(0x400 /* C2 */));
// If C2 is set, computation only has partial result. Loop to
// continue computation.
__ j(not_zero, &partial_remainder_loop);
}
Label valid_result;
Label return_result;
// If Invalid Operand or Zero Division exceptions are set,
// return NaN.
__ testb(rax, Immediate(5));
__ j(zero, &valid_result);
__ fstp(0); // Drop result in st(0).
int64_t kNaNValue = V8_INT64_C(0x7ff8000000000000);
__ movq(rcx, kNaNValue, RelocInfo::NONE);
__ movq(Operand(rsp, kPointerSize), rcx);
__ movsd(xmm0, Operand(rsp, kPointerSize));
__ jmp(&return_result);
// If result is valid, return that.
__ bind(&valid_result);
__ fstp_d(Operand(rsp, kPointerSize));
__ movsd(xmm0, Operand(rsp, kPointerSize));
// Clean up FPU stack and exceptions and return xmm0
__ bind(&return_result);
__ fstp(0); // Unload y.
Label clear_exceptions;
__ testb(rax, Immediate(0x3f /* Any Exception*/));
__ j(not_zero, &clear_exceptions);
__ ret(0);
__ bind(&clear_exceptions);
__ fnclex();
__ ret(0);
CodeDesc desc;
masm.GetCode(&desc);
OS::ProtectCode(buffer, actual_size);
// Call the function from C++ through this pointer.
return FUNCTION_CAST<ModuloFunction>(buffer);
}
#endif
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_X64
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