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comparison src/cpu/x86/vm/stubGenerator_x86_32.cpp @ 11127:980532a806a5

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8016697: Use stubs to implement safefetch Summary: Implement Safefetch as stub routines. This reduces compiler and os dependencies. Reviewed-by: twisti, kvn
author goetz
date Thu, 20 Jun 2013 15:02:05 +0200
parents b800986664f4
children 6b0fd0964b87 740e263c80c6
comparison
equal deleted inserted replaced
11088:ea4d24c1e0c6 11127:980532a806a5
2764 __ ret(0); 2764 __ ret(0);
2765 2765
2766 return start; 2766 return start;
2767 } 2767 }
2768 2768
2769 // Safefetch stubs.
2770 void generate_safefetch(const char* name, int size, address* entry,
2771 address* fault_pc, address* continuation_pc) {
2772 // safefetch signatures:
2773 // int SafeFetch32(int* adr, int errValue);
2774 // intptr_t SafeFetchN (intptr_t* adr, intptr_t errValue);
2775
2776 StubCodeMark mark(this, "StubRoutines", name);
2777
2778 // Entry point, pc or function descriptor.
2779 *entry = __ pc();
2780
2781 __ movl(rax, Address(rsp, 0x8));
2782 __ movl(rcx, Address(rsp, 0x4));
2783 // Load *adr into eax, may fault.
2784 *fault_pc = __ pc();
2785 switch (size) {
2786 case 4:
2787 // int32_t
2788 __ movl(rax, Address(rcx, 0));
2789 break;
2790 case 8:
2791 // int64_t
2792 Unimplemented();
2793 break;
2794 default:
2795 ShouldNotReachHere();
2796 }
2797
2798 // Return errValue or *adr.
2799 *continuation_pc = __ pc();
2800 __ ret(0);
2801 }
2769 2802
2770 public: 2803 public:
2771 // Information about frame layout at time of blocking runtime call. 2804 // Information about frame layout at time of blocking runtime call.
2772 // Note that we only have to preserve callee-saved registers since 2805 // Note that we only have to preserve callee-saved registers since
2773 // the compilers are responsible for supplying a continuation point 2806 // the compilers are responsible for supplying a continuation point
2976 StubRoutines::_aescrypt_encryptBlock = generate_aescrypt_encryptBlock(); 3009 StubRoutines::_aescrypt_encryptBlock = generate_aescrypt_encryptBlock();
2977 StubRoutines::_aescrypt_decryptBlock = generate_aescrypt_decryptBlock(); 3010 StubRoutines::_aescrypt_decryptBlock = generate_aescrypt_decryptBlock();
2978 StubRoutines::_cipherBlockChaining_encryptAESCrypt = generate_cipherBlockChaining_encryptAESCrypt(); 3011 StubRoutines::_cipherBlockChaining_encryptAESCrypt = generate_cipherBlockChaining_encryptAESCrypt();
2979 StubRoutines::_cipherBlockChaining_decryptAESCrypt = generate_cipherBlockChaining_decryptAESCrypt(); 3012 StubRoutines::_cipherBlockChaining_decryptAESCrypt = generate_cipherBlockChaining_decryptAESCrypt();
2980 } 3013 }
3014
3015 // Safefetch stubs.
3016 generate_safefetch("SafeFetch32", sizeof(int), &StubRoutines::_safefetch32_entry,
3017 &StubRoutines::_safefetch32_fault_pc,
3018 &StubRoutines::_safefetch32_continuation_pc);
3019 StubRoutines::_safefetchN_entry = StubRoutines::_safefetch32_entry;
3020 StubRoutines::_safefetchN_fault_pc = StubRoutines::_safefetch32_fault_pc;
3021 StubRoutines::_safefetchN_continuation_pc = StubRoutines::_safefetch32_continuation_pc;
2981 } 3022 }
2982 3023
2983 3024
2984 public: 3025 public:
2985 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) { 3026 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {