--- a/hotspot/src/cpu/x86/vm/assembler_x86.cpp Wed Feb 15 16:29:40 2012 -0800
+++ b/hotspot/src/cpu/x86/vm/assembler_x86.cpp Wed Feb 15 21:37:49 2012 -0800
@@ -236,6 +236,16 @@
}
}
+// Force generation of a 4 byte immediate value even if it fits into 8bit
+void Assembler::emit_arith_imm32(int op1, int op2, Register dst, int32_t imm32) {
+ assert(isByte(op1) && isByte(op2), "wrong opcode");
+ assert((op1 & 0x01) == 1, "should be 32bit operation");
+ assert((op1 & 0x02) == 0, "sign-extension bit should not be set");
+ emit_byte(op1);
+ emit_byte(op2 | encode(dst));
+ emit_long(imm32);
+}
+
// immediate-to-memory forms
void Assembler::emit_arith_operand(int op1, Register rm, Address adr, int32_t imm32) {
assert((op1 & 0x01) == 1, "should be 32bit operation");
@@ -939,6 +949,7 @@
}
void Assembler::addr_nop_4() {
+ assert(UseAddressNop, "no CPU support");
// 4 bytes: NOP DWORD PTR [EAX+0]
emit_byte(0x0F);
emit_byte(0x1F);
@@ -947,6 +958,7 @@
}
void Assembler::addr_nop_5() {
+ assert(UseAddressNop, "no CPU support");
// 5 bytes: NOP DWORD PTR [EAX+EAX*0+0] 8-bits offset
emit_byte(0x0F);
emit_byte(0x1F);
@@ -956,6 +968,7 @@
}
void Assembler::addr_nop_7() {
+ assert(UseAddressNop, "no CPU support");
// 7 bytes: NOP DWORD PTR [EAX+0] 32-bits offset
emit_byte(0x0F);
emit_byte(0x1F);
@@ -964,6 +977,7 @@
}
void Assembler::addr_nop_8() {
+ assert(UseAddressNop, "no CPU support");
// 8 bytes: NOP DWORD PTR [EAX+EAX*0+0] 32-bits offset
emit_byte(0x0F);
emit_byte(0x1F);
@@ -2769,6 +2783,12 @@
emit_arith(0x81, 0xE8, dst, imm32);
}
+// Force generation of a 4 byte immediate value even if it fits into 8bit
+void Assembler::subl_imm32(Register dst, int32_t imm32) {
+ prefix(dst);
+ emit_arith_imm32(0x81, 0xE8, dst, imm32);
+}
+
void Assembler::subl(Register dst, Address src) {
InstructionMark im(this);
prefix(src, dst);
@@ -4760,6 +4780,12 @@
emit_arith(0x81, 0xE8, dst, imm32);
}
+// Force generation of a 4 byte immediate value even if it fits into 8bit
+void Assembler::subq_imm32(Register dst, int32_t imm32) {
+ (void) prefixq_and_encode(dst->encoding());
+ emit_arith_imm32(0x81, 0xE8, dst, imm32);
+}
+
void Assembler::subq(Register dst, Address src) {
InstructionMark im(this);
prefixq(src, dst);
@@ -5101,15 +5127,6 @@
}
}
-void MacroAssembler::fat_nop() {
- // A 5 byte nop that is safe for patching (see patch_verified_entry)
- emit_byte(0x26); // es:
- emit_byte(0x2e); // cs:
- emit_byte(0x64); // fs:
- emit_byte(0x65); // gs:
- emit_byte(0x90);
-}
-
void MacroAssembler::jC2(Register tmp, Label& L) {
// set parity bit if FPU flag C2 is set (via rax)
save_rax(tmp);
@@ -5704,17 +5721,6 @@
/* else */ { subq(dst, value) ; return; }
}
-void MacroAssembler::fat_nop() {
- // A 5 byte nop that is safe for patching (see patch_verified_entry)
- // Recommened sequence from 'Software Optimization Guide for the AMD
- // Hammer Processor'
- emit_byte(0x66);
- emit_byte(0x66);
- emit_byte(0x90);
- emit_byte(0x66);
- emit_byte(0x90);
-}
-
void MacroAssembler::incrementq(Register reg, int value) {
if (value == min_jint) { addq(reg, value); return; }
if (value < 0) { decrementq(reg, -value); return; }
@@ -6766,6 +6772,19 @@
mov(rbp, rsp);
}
+// A 5 byte nop that is safe for patching (see patch_verified_entry)
+void MacroAssembler::fat_nop() {
+ if (UseAddressNop) {
+ addr_nop_5();
+ } else {
+ emit_byte(0x26); // es:
+ emit_byte(0x2e); // cs:
+ emit_byte(0x64); // fs:
+ emit_byte(0x65); // gs:
+ emit_byte(0x90);
+ }
+}
+
void MacroAssembler::fcmp(Register tmp) {
fcmp(tmp, 1, true, true);
}
@@ -7825,6 +7844,11 @@
LP64_ONLY(subq(dst, imm32)) NOT_LP64(subl(dst, imm32));
}
+// Force generation of a 4 byte immediate value even if it fits into 8bit
+void MacroAssembler::subptr_imm32(Register dst, int32_t imm32) {
+ LP64_ONLY(subq_imm32(dst, imm32)) NOT_LP64(subl_imm32(dst, imm32));
+}
+
void MacroAssembler::subptr(Register dst, Register src) {
LP64_ONLY(subq(dst, src)) NOT_LP64(subl(dst, src));
}
@@ -9292,6 +9316,80 @@
}
#endif // _LP64
+
+// C2 compiled method's prolog code.
+void MacroAssembler::verified_entry(int framesize, bool stack_bang, bool fp_mode_24b) {
+
+ // WARNING: Initial instruction MUST be 5 bytes or longer so that
+ // NativeJump::patch_verified_entry will be able to patch out the entry
+ // code safely. The push to verify stack depth is ok at 5 bytes,
+ // the frame allocation can be either 3 or 6 bytes. So if we don't do
+ // stack bang then we must use the 6 byte frame allocation even if
+ // we have no frame. :-(
+
+ assert((framesize & (StackAlignmentInBytes-1)) == 0, "frame size not aligned");
+ // Remove word for return addr
+ framesize -= wordSize;
+
+ // Calls to C2R adapters often do not accept exceptional returns.
+ // We require that their callers must bang for them. But be careful, because
+ // some VM calls (such as call site linkage) can use several kilobytes of
+ // stack. But the stack safety zone should account for that.
+ // See bugs 4446381, 4468289, 4497237.
+ if (stack_bang) {
+ generate_stack_overflow_check(framesize);
+
+ // We always push rbp, so that on return to interpreter rbp, will be
+ // restored correctly and we can correct the stack.
+ push(rbp);
+ // Remove word for ebp
+ framesize -= wordSize;
+
+ // Create frame
+ if (framesize) {
+ subptr(rsp, framesize);
+ }
+ } else {
+ // Create frame (force generation of a 4 byte immediate value)
+ subptr_imm32(rsp, framesize);
+
+ // Save RBP register now.
+ framesize -= wordSize;
+ movptr(Address(rsp, framesize), rbp);
+ }
+
+ if (VerifyStackAtCalls) { // Majik cookie to verify stack depth
+ framesize -= wordSize;
+ movptr(Address(rsp, framesize), (int32_t)0xbadb100d);
+ }
+
+#ifndef _LP64
+ // If method sets FPU control word do it now
+ if (fp_mode_24b) {
+ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_24()));
+ }
+ if (UseSSE >= 2 && VerifyFPU) {
+ verify_FPU(0, "FPU stack must be clean on entry");
+ }
+#endif
+
+#ifdef ASSERT
+ if (VerifyStackAtCalls) {
+ Label L;
+ push(rax);
+ mov(rax, rsp);
+ andptr(rax, StackAlignmentInBytes-1);
+ cmpptr(rax, StackAlignmentInBytes-wordSize);
+ pop(rax);
+ jcc(Assembler::equal, L);
+ stop("Stack is not properly aligned!");
+ bind(L);
+ }
+#endif
+
+}
+
+
// IndexOf for constant substrings with size >= 8 chars
// which don't need to be loaded through stack.
void MacroAssembler::string_indexofC8(Register str1, Register str2,