/*
- * Copyright (C) 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
namespace JSC {
-#if USE(MASM_PROBE)
+#if ENABLE(MASM_PROBE)
-void MacroAssemblerX86Common::ProbeContext::dumpCPURegisters(const char* indentation)
+#define INDENT printIndent(indentation)
+
+void MacroAssemblerX86Common::printCPURegisters(MacroAssemblerX86Common::CPUState& cpu, int indentation)
{
#if CPU(X86)
- #define DUMP_GPREGISTER(_type, _regName) { \
+ #define PRINT_GPREGISTER(_type, _regName) { \
int32_t value = reinterpret_cast<int32_t>(cpu._regName); \
- dataLogF("%s %6s: 0x%08x %d\n", indentation, #_regName, value, value) ; \
+ INDENT, dataLogF("%6s: 0x%08x %d\n", #_regName, value, value) ; \
}
#elif CPU(X86_64)
- #define DUMP_GPREGISTER(_type, _regName) { \
+ #define PRINT_GPREGISTER(_type, _regName) { \
int64_t value = reinterpret_cast<int64_t>(cpu._regName); \
- dataLogF("%s %6s: 0x%016llx %lld\n", indentation, #_regName, value, value) ; \
+ INDENT, dataLogF("%6s: 0x%016llx %lld\n", #_regName, value, value) ; \
}
#endif
- FOR_EACH_CPU_GPREGISTER(DUMP_GPREGISTER)
- FOR_EACH_CPU_SPECIAL_REGISTER(DUMP_GPREGISTER)
- #undef DUMP_GPREGISTER
+ FOR_EACH_CPU_GPREGISTER(PRINT_GPREGISTER)
+ FOR_EACH_CPU_SPECIAL_REGISTER(PRINT_GPREGISTER)
+ #undef PRINT_GPREGISTER
- #define DUMP_FPREGISTER(_type, _regName) { \
- uint32_t* u = reinterpret_cast<uint32_t*>(&cpu._regName); \
+ #define PRINT_FPREGISTER(_type, _regName) { \
+ uint64_t* u = reinterpret_cast<uint64_t*>(&cpu._regName); \
double* d = reinterpret_cast<double*>(&cpu._regName); \
- dataLogF("%s %6s: 0x%08x%08x 0x%08x%08x %12g %12g\n", \
- indentation, #_regName, u[3], u[2], u[1], u[0], d[1], d[0]); \
+ INDENT, dataLogF("%6s: 0x%016llx %.13g\n", #_regName, *u, *d); \
}
- FOR_EACH_CPU_FPREGISTER(DUMP_FPREGISTER)
- #undef DUMP_FPREGISTER
+ FOR_EACH_CPU_FPREGISTER(PRINT_FPREGISTER)
+ #undef PRINT_FPREGISTER
}
-void MacroAssemblerX86Common::ProbeContext::dump(const char* indentation)
+#undef INDENT
+
+void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, RegisterID regID)
{
- if (!indentation)
- indentation = "";
+ const char* name = CPUState::registerName(regID);
+ union {
+ void* voidPtr;
+ intptr_t intptrValue;
+ } u;
+ u.voidPtr = cpu.registerValue(regID);
+ dataLogF("%s:<%p %ld>", name, u.voidPtr, u.intptrValue);
+}
- dataLogF("%sProbeContext %p {\n", indentation, this);
- dataLogF("%s probeFunction: %p\n", indentation, probeFunction);
- dataLogF("%s arg1: %p %llu\n", indentation, arg1, reinterpret_cast<int64_t>(arg1));
- dataLogF("%s arg2: %p %llu\n", indentation, arg2, reinterpret_cast<int64_t>(arg2));
- dataLogF("%s cpu: {\n", indentation);
+void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, FPRegisterID regID)
+{
+ const char* name = CPUState::registerName(regID);
+ union {
+ double doubleValue;
+ uint64_t uint64Value;
+ } u;
+ u.doubleValue = cpu.registerValue(regID);
+ dataLogF("%s:<0x%016llx %.13g>", name, u.uint64Value, u.doubleValue);
+}
- dumpCPURegisters(indentation);
+extern "C" void ctiMasmProbeTrampoline();
- dataLogF("%s }\n", indentation);
- dataLogF("%s}\n", indentation);
+// What code is emitted for the probe?
+// ==================================
+// We want to keep the size of the emitted probe invocation code as compact as
+// possible to minimize the perturbation to the JIT generated code. However,
+// we also need to preserve the CPU registers and set up the ProbeContext to be
+// passed to the user probe function.
+//
+// Hence, we do only the minimum here to preserve a scratch register (i.e. rax
+// in this case) and the stack pointer (i.e. rsp), and pass the probe arguments.
+// We'll let the ctiMasmProbeTrampoline handle the rest of the probe invocation
+// work i.e. saving the CPUState (and setting up the ProbeContext), calling the
+// user probe function, and restoring the CPUState before returning to JIT
+// generated code.
+//
+// What registers need to be saved?
+// ===============================
+// The registers are saved for 2 reasons:
+// 1. To preserve their state in the JITted code. This means that all registers
+// that are not callee saved needs to be saved. We also need to save the
+// condition code registers because the probe can be inserted between a test
+// and a branch.
+// 2. To allow the probe to inspect the values of the registers for debugging
+// purposes. This means all registers need to be saved.
+//
+// In summary, save everything. But for reasons stated above, we should do the
+// minimum here and let ctiMasmProbeTrampoline do the heavy lifting to save the
+// full set.
+//
+// What values are in the saved registers?
+// ======================================
+// Conceptually, the saved registers should contain values as if the probe
+// is not present in the JIT generated code. Hence, they should contain values
+// that are expected at the start of the instruction immediately following the
+// probe.
+//
+// Specifically, the saved stack pointer register will point to the stack
+// position before we push the ProbeContext frame. The saved rip will point to
+// the address of the instruction immediately following the probe.
+
+void MacroAssemblerX86Common::probe(MacroAssemblerX86Common::ProbeFunction function, void* arg1, void* arg2)
+{
+ push(RegisterID::esp);
+ push(RegisterID::eax);
+ move(TrustedImmPtr(arg2), RegisterID::eax);
+ push(RegisterID::eax);
+ move(TrustedImmPtr(arg1), RegisterID::eax);
+ push(RegisterID::eax);
+ move(TrustedImmPtr(reinterpret_cast<void*>(function)), RegisterID::eax);
+ push(RegisterID::eax);
+ move(TrustedImmPtr(reinterpret_cast<void*>(ctiMasmProbeTrampoline)), RegisterID::eax);
+ call(RegisterID::eax);
}
-#endif // USE(MASM_PROBE)
+#endif // ENABLE(MASM_PROBE)
+
+#if CPU(X86) && !OS(MAC_OS_X)
+MacroAssemblerX86Common::SSE2CheckState MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2;
+#endif
} // namespace JSC
projects / apple / javascriptcore.git / blobdiff