/*
* Initialize the floating point unit.
*/
void
fpuinit(void)
{
register_t saveintr;
u_int mxcsr;
u_short control;
if (IS_BSP())
fpuinit_bsp1();
if (use_xsave) {
load_cr4(rcr4() | CR4_XSAVE);
xsetbv(XCR0, xsave_mask);
}
/*
* XCR0 shall be set up before CPU can report the save area size.
*/
if (IS_BSP())
fpuinit_bsp2();
/*
* It is too early for critical_enter() to work on AP.
*/
saveintr = intr_disable();
stop_emulating();
fninit();
control = __INITIAL_FPUCW__;
fldcw(control);
mxcsr = __INITIAL_MXCSR__;
ldmxcsr(mxcsr);
start_emulating();
intr_restore(saveintr);
}
address generate_call_stub(address& return_address) {
StubCodeMark mark(this, "StubRoutines", "call_stub");
address start = __ pc();
// stub code parameters / addresses
assert(frame::entry_frame_call_wrapper_offset == 2, "adjust this code");
bool sse_save = false;
const Address esp_after_call(ebp, -4 * wordSize); // same as in generate_catch_exception()!
const Address mxcsr_save (ebp, -4 * wordSize);
const Address result (ebp, 3 * wordSize);
const Address result_type (ebp, 4 * wordSize);
const Address method (ebp, 5 * wordSize);
const Address entry_point (ebp, 6 * wordSize);
const Address parameters (ebp, 7 * wordSize);
const Address parameter_size(ebp, 8 * wordSize);
const Address thread (ebp, 9 * wordSize); // same as in generate_catch_exception()!
#ifdef COMPILER2
sse_save = VM_Version::supports_sse();
#endif
// stub code
__ enter();
// save edi, esi, & ebx, according to C calling conventions
__ pushl(edi);
__ pushl(esi);
__ pushl(ebx);
__ subl(esp, wordSize); // space for %mxcsr save
// save and initialize %mxcsr
if (sse_save) {
__ stmxcsr(mxcsr_save);
__ ldmxcsr(Address((int) StubRoutines::addr_mxcsr_std(), relocInfo::none));
}
#ifdef ASSERT
// make sure we have no pending exceptions
{ Label L;
__ movl(ecx, thread);
__ cmpl(Address(ecx, Thread::pending_exception_offset()), (int)NULL);
__ jcc(Assembler::equal, L);
__ stop("StubRoutines::call_stub: entered with pending exception");
__ bind(L);
}
#endif
// pass parameters if any
Label parameters_done;
__ movl(ecx, parameter_size); // parameter counter
__ testl(ecx, ecx);
__ jcc(Assembler::zero, parameters_done);
// parameter passing loop
Label loop;
__ movl(edx, parameters); // parameter pointer
__ movl(esi, ecx); // parameter counter is in esi now
__ movl(ecx, Address(edx)); // get first parameter in case it is a receiver
__ bind(loop);
__ movl(eax, Address(edx)); // get parameter
__ addl(edx, wordSize); // advance to next parameter
__ decl(esi); // decrement counter
__ pushl(eax); // pass parameter
__ jcc(Assembler::notZero, loop);
// call Java function
__ bind(parameters_done);
__ movl(ebx, method); // get methodOop
__ movl(esi, entry_point); // get entry_point
__ call(esi, relocInfo::none);
return_address = __ pc();
// store result depending on type
// (everything that is not T_LONG, T_FLOAT or T_DOUBLE is treated as T_INT)
__ movl(edi, result);
Label is_long, is_float, is_double, exit;
__ movl(esi, result_type);
__ cmpl(esi, T_LONG);
__ jcc(Assembler::equal, is_long);
__ cmpl(esi, T_FLOAT);
__ jcc(Assembler::equal, is_float);
__ cmpl(esi, T_DOUBLE);
__ jcc(Assembler::equal, is_double);
// handle T_INT case
__ movl(Address(edi), eax);
__ bind(exit);
// pop parameters
__ movl(ecx, parameter_size);
__ leal(esp, Address(esp, ecx, Address::times_4));
// check if parameters have been popped correctly
#ifdef ASSERT
Label esp_wrong;
__ leal(edi, esp_after_call);
__ cmpl(esp, edi);
__ jcc(Assembler::notEqual, esp_wrong);
#endif
// restore %mxcsr
if (sse_save) {
__ ldmxcsr(mxcsr_save);
}
// restore edi & esi
__ addl(esp, wordSize); // remove %mxcsr save area
__ popl(ebx);
__ popl(esi);
__ popl(edi);
// return
__ popl(ebp);
__ ret(0);
// handle return types different from T_INT
__ bind(is_long);
__ movl(Address(edi, 0 * wordSize), eax);
__ movl(Address(edi, 1 * wordSize), edx);
__ jmp(exit);
__ bind(is_float);
__ fstp_s(Address(edi));
__ jmp(exit);
__ bind(is_double);
__ fstp_d(Address(edi));
__ jmp(exit);
#ifdef ASSERT
// stack pointer misadjusted
__ bind(esp_wrong);
__ stop("esp wrong after Java call");
#endif
return start;
}