# HG changeset patch # User anoll # Date 1386145877 -3600 # Node ID 61746b5f0ed3ed1a5367ccb3a7e95f40a59afc86 # Parent eae426d683f62a00b0f1b7e0f3e9aeecd60018a9 8028109: compiler/codecache/CheckReservedInitialCodeCacheSizeArgOrder.java crashes in RT_Baseline Summary: Use non-relocatable code to load byte_map_base Reviewed-by: kvn, roland diff -r eae426d683f6 -r 61746b5f0ed3 src/cpu/x86/vm/c1_Runtime1_x86.cpp --- a/src/cpu/x86/vm/c1_Runtime1_x86.cpp Mon Dec 02 11:12:32 2013 +0100 +++ b/src/cpu/x86/vm/c1_Runtime1_x86.cpp Wed Dec 04 09:31:17 2013 +0100 @@ -1719,10 +1719,12 @@ BarrierSet* bs = Universe::heap()->barrier_set(); CardTableModRefBS* ct = (CardTableModRefBS*)bs; + assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); + Label done; Label runtime; - // At this point we know new_value is non-NULL and the new_value crosses regsion. + // At this point we know new_value is non-NULL and the new_value crosses regions. // Must check to see if card is already dirty const Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread); @@ -1735,26 +1737,17 @@ __ push(rax); __ push(rcx); - NOT_LP64(__ get_thread(thread);) - ExternalAddress cardtable((address)ct->byte_map_base); - assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); + const Register cardtable = rax; + const Register card_addr = rcx; - const Register card_addr = rcx; -#ifdef _LP64 - const Register tmp = rscratch1; f.load_argument(0, card_addr); - __ shrq(card_addr, CardTableModRefBS::card_shift); - __ lea(tmp, cardtable); - // get the address of the card - __ addq(card_addr, tmp); -#else - const Register card_index = rcx; - f.load_argument(0, card_index); - __ shrl(card_index, CardTableModRefBS::card_shift); + __ shrptr(card_addr, CardTableModRefBS::card_shift); + // Do not use ExternalAddress to load 'byte_map_base', since 'byte_map_base' is NOT + // a valid address and therefore is not properly handled by the relocation code. + __ movptr(cardtable, (intptr_t)ct->byte_map_base); + __ addptr(card_addr, cardtable); - Address index(noreg, card_index, Address::times_1); - __ leal(card_addr, __ as_Address(ArrayAddress(cardtable, index))); -#endif + NOT_LP64(__ get_thread(thread);) __ cmpb(Address(card_addr, 0), (int)G1SATBCardTableModRefBS::g1_young_card_val()); __ jcc(Assembler::equal, done); diff -r eae426d683f6 -r 61746b5f0ed3 src/cpu/x86/vm/macroAssembler_x86.cpp --- a/src/cpu/x86/vm/macroAssembler_x86.cpp Mon Dec 02 11:12:32 2013 +0100 +++ b/src/cpu/x86/vm/macroAssembler_x86.cpp Wed Dec 04 09:31:17 2013 +0100 @@ -3354,6 +3354,8 @@ BarrierSet* bs = Universe::heap()->barrier_set(); CardTableModRefBS* ct = (CardTableModRefBS*)bs; + assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); + Label done; Label runtime; @@ -3371,28 +3373,16 @@ // storing region crossing non-NULL, is card already dirty? - ExternalAddress cardtable((address) ct->byte_map_base); - assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); -#ifdef _LP64 const Register card_addr = tmp; - - movq(card_addr, store_addr); - shrq(card_addr, CardTableModRefBS::card_shift); - - lea(tmp2, cardtable); - - // get the address of the card - addq(card_addr, tmp2); -#else - const Register card_index = tmp; - - movl(card_index, store_addr); - shrl(card_index, CardTableModRefBS::card_shift); - - Address index(noreg, card_index, Address::times_1); - const Register card_addr = tmp; - lea(card_addr, as_Address(ArrayAddress(cardtable, index))); -#endif + const Register cardtable = tmp2; + + movptr(card_addr, store_addr); + shrptr(card_addr, CardTableModRefBS::card_shift); + // Do not use ExternalAddress to load 'byte_map_base', since 'byte_map_base' is NOT + // a valid address and therefore is not properly handled by the relocation code. + movptr(cardtable, (intptr_t)ct->byte_map_base); + addptr(card_addr, cardtable); + cmpb(Address(card_addr, 0), (int)G1SATBCardTableModRefBS::g1_young_card_val()); jcc(Assembler::equal, done); @@ -3416,7 +3406,7 @@ movq(Address(tmp2, 0), card_addr); #else addl(tmp2, queue_index); - movl(Address(tmp2, 0), card_index); + movl(Address(tmp2, 0), card_addr); #endif jmp(done); @@ -3468,25 +3458,19 @@ // The calculation for byte_map_base is as follows: // byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); - // So this essentially converts an address to a displacement and - // it will never need to be relocated. On 64bit however the value may be too - // large for a 32bit displacement - + // So this essentially converts an address to a displacement and it will + // never need to be relocated. On 64bit however the value may be too + // large for a 32bit displacement. intptr_t disp = (intptr_t) ct->byte_map_base; if (is_simm32(disp)) { Address cardtable(noreg, obj, Address::times_1, disp); movb(cardtable, 0); } else { - // By doing it as an ExternalAddress disp could be converted to a rip-relative - // displacement and done in a single instruction given favorable mapping and - // a smarter version of as_Address. Worst case it is two instructions which - // is no worse off then loading disp into a register and doing as a simple - // Address() as above. - // We can't do as ExternalAddress as the only style since if disp == 0 we'll - // assert since NULL isn't acceptable in a reloci (see 6644928). In any case - // in some cases we'll get a single instruction version. - - ExternalAddress cardtable((address)disp); + // By doing it as an ExternalAddress 'disp' could be converted to a rip-relative + // displacement and done in a single instruction given favorable mapping and a + // smarter version of as_Address. However, 'ExternalAddress' generates a relocation + // entry and that entry is not properly handled by the relocation code. + AddressLiteral cardtable((address)ct->byte_map_base, relocInfo::none); Address index(noreg, obj, Address::times_1); movb(as_Address(ArrayAddress(cardtable, index)), 0); }