//----------------------------------------------------------------------------------------------------
// Support for jint Atomic::add(jint inc, volatile jint* dest).
//
// Arguments:
//
// inc - GR_I0 (e.g., +1 or -1)
// dest - GR_I1
//
// Results:
//
// GR_RET - the new value stored in dest
//
//
address generate_atomic_add() {
StubCodeMark mark(this, "StubRoutines", "atomic_add");
const Register inc = GR_I0;
const Register dest = GR_I1;
address start = __ emit_fd();
__ mf();
// increment or decrement
__ cmp4(PR6, PR7, 1, inc, Assembler::equal);
__ fetchadd4(PR6, GR_RET, dest, 1, Assembler::acquire);
__ fetchadd4(PR7, GR_RET, dest, -1, Assembler::acquire);
// GR_RET contains result of the fetch, not the add
__ sxt4(GR_RET, GR_RET);
__ adds(PR6, GR_RET, 1, GR_RET);
__ adds(PR7, GR_RET, -1, GR_RET);
__ ret();
return start;
}
//----------------------------------------------------------------------------------------------------
// Support for jint Atomic::xchg(jint exchange_value, volatile jint* dest)
//
// Arguments:
//
// exchange_value - GR_I0
// dest - GR_I1
//
// Results:
//
// GR_RET - the value previously stored in dest
//
address generate_atomic_xchg() {
StubCodeMark mark(this, "StubRoutines", "atomic_xchg");
const Register exchange_value = GR_I0;
const Register dest = GR_I1;
address start = __ emit_fd();
__ mf();
__ xchg4(GR_RET, dest, exchange_value);
__ sxt4(GR_RET, GR_RET);
__ ret();
return start;
}
//----------------------------------------------------------------------------------------------------
// Support for jint Atomic::cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value)
//
// Arguments:
//
// exchange_value - GR_I0
// dest - GR_I1
// compare_value - GR_I2
//
// Results:
//
// GR_RET - the value previously stored in dest
//
address generate_atomic_cmpxchg() {
StubCodeMark mark(this, "StubRoutines", "atomic_cmpxchg");
const Register exchange_value = GR_I0;
const Register dest = GR_I1;
const Register compare_value = GR_I2;
address start = __ emit_fd();
__ mf();
__ zxt4(compare_value, compare_value);
__ mov(AR_CCV, compare_value);
__ cmpxchg4(GR_RET, dest, exchange_value, Assembler::acquire);
__ sxt4(GR_RET, GR_RET);
__ ret();
return start;
}
void InterpreterRuntime::SignatureHandlerGenerator::pass_prev(int slot_offset) {
Argument jni_arg(_prev_jni_offset);
Argument::Sig sig = _prev_sig;
if (sig == Argument::no_sig) {
return;
}
slot_offset += BytesPerWord;
if (Argument::is_integral(sig)) {
// Integral argument
// Load either the output register or a very-local temp from the java stack
// Bump java stack offset address if requested.
const Register tmp = jni_arg.is_register() ? jni_arg.as_register() : GR2_SCRATCH;
if (slot_offset == 0) {
__ ld8(tmp, GR_I0);
} else {
__ ld8(tmp, GR_I0, -slot_offset);
}
if (Argument::is_4byte(sig)) {
__ sxt4(tmp, tmp);
}
if (Argument::is_obj(sig)) {
// Object, box if not null
const PredicateRegister box = PR15_SCRATCH;
__ cmp(box, PR0, 0, tmp, Assembler::notEqual);
__ add(box, tmp, GR_I0, slot_offset);
}
if (!jni_arg.is_register()) {
// Store into native memory parameter list
__ add(GR3_SCRATCH, SP, jni_arg.jni_offset_in_frame());
__ st8(GR3_SCRATCH, tmp);
}
} else {
// Floating point argument
const FloatRegister tmp = jni_arg.is_register() ? as_FloatRegister(FR_I0->encoding() + _prev_float_reg_offset) : FR6;
if (jni_arg.is_register()) {
if (Argument::is_4byte(sig)) {
// Single precision float
if (slot_offset == 0) {
__ ldfs(tmp, GR_I0);
} else {
__ ldfs(tmp, GR_I0, -slot_offset);
}
} else {
// Double precision float
if (slot_offset == 0) {
__ ldfd(tmp, GR_I0);
} else {
__ ldfd(tmp, GR_I0, -slot_offset);
}
}
} else {
if (slot_offset == 0) {
__ ld8(GR2_SCRATCH, GR_I0);
} else {
__ ld8(GR2_SCRATCH, GR_I0, -slot_offset);
}
__ add(GR3_SCRATCH, SP, jni_arg.jni_offset_in_frame());
__ st8(GR3_SCRATCH, GR2_SCRATCH);
}
}
}
//------------------------------------------------------------------------------------------------------------------------
// Call stubs are used to call Java from C
//
// GR_I0 - call wrapper address : address
// GR_I1 - result : intptr_t*
// GR_I2 - result type : BasicType
// GR_I3 - method : methodOop
// GR_I4 - interpreter entry point : address
// GR_I5 - parameter block : intptr_t*
// GR_I6 - parameter count in words : int
// GR_I7 - thread : Thread*
//
address generate_call_stub(address& return_address) {
StubCodeMark mark(this, "StubRoutines", "call_stub");
const Register result = GR_I1;
const Register type = GR_I2;
const Register method = GR_I3;
const Register entry_ptr = GR_I4;
const Register parms = GR_I5;
const Register parm_count = GR_I6;
const Register thread = GR_I7;
const Register parm_size = GR31_SCRATCH;
const Register entry = GR30_SCRATCH;
const Register arg = GR29_SCRATCH;
const Register out_tos = GR49; // Equivalent of GR_Otos
const Register out_parms = GR50; // Equivalent of GR_Olocals (unused)
const BranchRegister entry_br = BR6_SCRATCH;
const PredicateRegister no_args = PR6_SCRATCH;
address start = __ emit_fd();
// Must allocate 8 output registers in case we go thru an i2c
// and the callee needs 8 input registers
__ alloc(GR_Lsave_PFS, 8, 9, 8, 0); // save AR_PFS
__ sxt4(parm_count, parm_count); // # of parms
__ mov(GR_Lsave_SP, SP); // save caller's SP
__ mov(GR_entry_frame_GR5, GR5_poll_page_addr);
__ mov(GR_entry_frame_GR6, GR6_caller_BSP);
__ mov(GR_entry_frame_GR7, GR7_reg_stack_limit);
// We can not tolerate an eager RSE cpu. Itanium-1 & 2 do not support
// this feature but we turn it off anyway
const Register RSC = GR2_SCRATCH;
__ mov(RSC, AR_RSC);
__ and3(RSC, -4, RSC); // Turn off two low bits
__ mov(AR_RSC, RSC); // enforced lazy mode
__ shladd(parm_size, parm_count, Interpreter::logStackElementSize(), GR0); // size of stack space for the parms
__ mov(GR_Lsave_RP, RP); // save return address
__ add(parm_size, parm_size, 15); // round up to multiple of 16 bytes. we use
// caller's 16-byte scratch area for params,
// so no need to add 16 to the current frame size.
__ mov(GR_Lsave_LC, AR_LC); // save AR_LC
__ add(out_parms, SP, Interpreter::stackElementSize()); // caller's SP+8 is 1st parm addr == target method locals addr
__ and3(parm_size, parm_size, -16);
__ cmp4(PR0, no_args, 0, parm_count, Assembler::less); // any parms?
__ mov(GR_entry_frame_GR4, GR4_thread); // save GR4_thread: it's a preserved register
__ sub(SP, SP, parm_size); // allocate the space for args + scratch
__ mov(entry_br, entry_ptr);
__ mov(GR27_method, method); // load method
__ mov(GR4_thread, thread); // load thread
if (TaggedStackInterpreter) __ shl(parm_count, parm_count, 1); // 2x tags
__ sub(parm_count, parm_count, 1); // cloop counts down to zero
// Initialize the register and memory stack limits for stack checking in compiled code
__ add(GR7_reg_stack_limit, thread_(register_stack_limit));
__ mov(GR6_caller_BSP, AR_BSP); // load register SP
__ movl(GR5_poll_page_addr, (intptr_t) os::get_polling_page() );
__ ld8(GR7_reg_stack_limit, GR7_reg_stack_limit); // load register stack limit
Label exit;
__ mov(AR_LC, parm_count);
__ mov(out_tos, out_parms); // out_tos = &out_parms[0]
__ br(no_args, exit, Assembler::dpnt);
// Reverse argument list and set up sender tos
Label copy_word;
__ bind(copy_word);
__ ld8(arg, parms, BytesPerWord); // load *parms++
__ st8(out_tos, arg, -BytesPerWord); // store *out_tos--
__ cloop(copy_word, Assembler::sptk, Assembler::few);
// Bias stack for tags.
if (TaggedStackInterpreter) __ st8(out_tos, GR0, -BytesPerWord);
__ bind(exit);
__ mov(GR_entry_frame_TOS, out_tos); // so entry_frame_argument_at can find TOS
// call interpreter frame manager
// Remember the senderSP so we interpreter can pop c2i arguments off of the stack
// when called via a c2i.
__ mov(GR28_sender_SP, SP);
__ call(entry_br);
return_address = __ pc();
// Store result depending on type. Everything that is not
// T_OBJECT, T_LONG, T_FLOAT, or T_DOUBLE is treated as T_INT.
const PredicateRegister is_obj = PR6_SCRATCH;
const PredicateRegister is_flt = PR7_SCRATCH;
const PredicateRegister is_dbl = PR8_SCRATCH;
const PredicateRegister is_lng = PR9_SCRATCH;
__ cmp4(is_obj, PR0, T_OBJECT, type, Assembler::equal);
__ cmp4(is_flt, PR0, T_FLOAT, type, Assembler::equal);
__ st4( result, GR_RET);
__ st8( is_obj, result, GR_RET);
__ stfs(is_flt, result, FR_RET);
__ cmp4(is_dbl, PR0, T_DOUBLE, type, Assembler::equal);
__ stfd(is_dbl, result, FR_RET);
__ cmp4(is_lng, PR0, T_LONG, type, Assembler::equal);
__ mov(RP, GR_Lsave_RP);
__ st8( is_lng, result, GR_RET);
__ mov(GR4_thread, GR_entry_frame_GR4);
__ mov(GR6_caller_BSP, GR_entry_frame_GR6);
__ mov(GR7_reg_stack_limit, GR_entry_frame_GR7);
__ mov(GR5_poll_page_addr, GR_entry_frame_GR5);
__ mov(AR_PFS, GR_Lsave_PFS);
__ mov(AR_LC, GR_Lsave_LC);
__ mov(SP, GR_Lsave_SP);
__ ret();
return start;
}
