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64142391fd
Adds the runtime support routines for XRay on SystemZ. Only function entry/exit is implemented. The original PR 113252 was reverted due to errors caused by adding DSO support to XRay. This PR is the original implementation with the changed function signatures. I'll add an implementation with DSO support later.
105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
//===-- xray_s390x.cpp ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// Implementation of s390x routines.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "xray_defs.h"
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#include "xray_interface_internal.h"
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#include <cassert>
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#include <cstring>
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bool __xray::patchFunctionEntry(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled,
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const XRayTrampolines &Trampolines,
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bool LogArgs) XRAY_NEVER_INSTRUMENT {
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uint32_t *Address = reinterpret_cast<uint32_t *>(Sled.address());
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// TODO: Trampoline addresses are currently inserted at compile-time, using
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// __xray_FunctionEntry and __xray_FunctionExit only.
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// To support DSO instrumentation, trampolines have to be written during
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// patching (see implementation on X86_64, e.g.).
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if (Enable) {
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// The resulting code is:
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// stmg %r2, %r15, 16(%r15)
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// llilf %2, FuncID
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// brasl %r14, __xray_FunctionEntry@GOT
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// The FuncId and the stmg instruction must be written.
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// Write FuncId into llilf.
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Address[2] = FuncId;
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// Write last part of stmg.
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reinterpret_cast<uint16_t *>(Address)[2] = 0x24;
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// Write first part of stmg.
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Address[0] = 0xeb2ff010;
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} else {
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// j +16 instructions.
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Address[0] = 0xa7f4000b;
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}
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return true;
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}
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bool __xray::patchFunctionExit(
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const bool Enable, const uint32_t FuncId, const XRaySledEntry &Sled,
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const XRayTrampolines &Trampolines) XRAY_NEVER_INSTRUMENT {
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uint32_t *Address = reinterpret_cast<uint32_t *>(Sled.address());
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// TODO: Trampoline addresses are currently inserted at compile-time, using
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// __xray_FunctionEntry and __xray_FunctionExit only.
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// To support DSO instrumentation, trampolines have to be written during
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// patching (see implementation on X86_64, e.g.).
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if (Enable) {
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// The resulting code is:
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// stmg %r2, %r15, 24(%r15)
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// llilf %2,FuncID
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// j __xray_FunctionEntry@GOT
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// The FuncId and the stmg instruction must be written.
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// Write FuncId into llilf.
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Address[2] = FuncId;
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// Write last part of of stmg.
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reinterpret_cast<uint16_t *>(Address)[2] = 0x24;
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// Write first part of stmg.
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Address[0] = 0xeb2ff010;
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} else {
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// br %14 instruction.
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reinterpret_cast<uint16_t *>(Address)[0] = 0x07fe;
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}
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return true;
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}
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bool __xray::patchFunctionTailExit(
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const bool Enable, const uint32_t FuncId, const XRaySledEntry &Sled,
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const XRayTrampolines &Trampolines) XRAY_NEVER_INSTRUMENT {
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return patchFunctionExit(Enable, FuncId, Sled, Trampolines);
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}
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bool __xray::patchCustomEvent(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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// TODO Implement.
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return false;
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}
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bool __xray::patchTypedEvent(const bool Enable, const uint32_t FuncId,
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const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
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// TODO Implement.
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return false;
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}
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extern "C" void __xray_ArgLoggerEntry() XRAY_NEVER_INSTRUMENT {
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// TODO this will have to be implemented in the trampoline assembly file.
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}
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extern "C" void __xray_FunctionTailExit() XRAY_NEVER_INSTRUMENT {
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// For PowerPC, calls to __xray_FunctionEntry and __xray_FunctionExit
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// are statically inserted into the sled. Tail exits are handled like normal
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// function exits. This trampoline is therefore not implemented.
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// This stub is placed here to avoid linking issues.
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}
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